"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:76755902-7bb6-465d-9aa3-4a9d39aa5b42","http://resolver.tudelft.nl/uuid:76755902-7bb6-465d-9aa3-4a9d39aa5b42","Bridging the gap: the workforce-patient dynamics: Understanding system behaviour of the social-organisational mental health care system to increase health care sustainability: a focus study on alcohol use disorders in the Netherlands","Bos, Daan (TU Delft Technology, Policy and Management)","Hinrichs-Krapels, S. (mentor); d’Hont, Floortje (graduation committee); de Vries, G. (graduation committee); Delft University of Technology (degree granting institution)","2023","Substance use disorders, particularly alcohol use disorder (AUD), are a major global health challenge, significantly impacting morbidity and mortality rates. In the Netherlands, around 20% of the population is affected by excessive alcohol consumption, with a notable treatment gap and disproportionate effects on the elderly. Despite increased research into AUD treatments, patient numbers remain stable, straining healthcare systems. Moreover, the Dutch government anticipates that addressing the needs of both diagnosed and undiagnosed patients, the workforce should be increased in the general healthcare sector from the current level of 16.67% to 25% of the total Dutch workforce by 2040. Furthermore, existing regulations and policies appear inadequate in effectively managing these demands.
This study aims to explore the socio-organisational drivers and policy effects on the Dutch mental health care system, focusing on AUD, to maintain sustainable quality care. It examines organizational drivers, expert perspectives, policy influence on system dynamics, and the relationship between capacity shortages and care quality. The research employs a mixed-method approach, including a literature review, exploratory interviews, a Participatory System Dynamics Modeling (PSDM) workshop, and a comparative analysis of data from 12 mental health services (MHS).
Key findings include the significance of internal factors like patient satisfaction and therapeutic alliance, and the crucial role of over and undertreatment considerations during treatment processes. External factors like self-coping, and individualization and blurring of alcohol in shops also influence both treatment effectiveness and alcohol consumption. Current policy regulations inadvertently contribute to capacity shortages and treatment gaps. System Dynamics (SD) modelling reveals that increased regulatory pressures and quality care demands lead to capacity being consumed by administrative tasks and budget gaps. This relates to a 'fixes that fail' archetype, combined with social dynamics like an ageing population and increased alcohol consumption, exacerbates the 'growth and underinvestment' archetype in the Dutch mental healthcare system.
The study highlights the unintended consequences of current policies, such as disjointed preventive measures and reduced practitioner autonomy. It also emphasizes the complexity of healthcare systems as revealed by the challenge of identifying cause-and-effect due to multiple aggregational levels, the diverse perspectives on the system both by literature and experts, the varied healthcare contexts and the multi-disciplinary and collaborative nature of (mental) healthcare. Key limitations include not fully addressing safety in health quality and challenges in integrating quantitative methods.
This thesis underscores the importance of a holistic approach in healthcare, considering both social and organizational aspects. It suggests that current policies may lead to over-regulation or insufficient prevention awareness, impacting both society and MHS organisations. Adopting a holistic system approach can enhance further understanding of policy impacts crucial for preventing a growing treatment-capacity gap and ensuring a sustainable mental health care system for society’s vulnerable members.","Mental health care; Quality of care; Sustainability; Systems Thinking; Participatory approach; System Dynamics; Policy analysis","en","master thesis","","","","","","","","","","","","Engineering and Policy Analysis","",""
"uuid:b5dd8289-4446-4e00-9b6b-2c1d652b9422","http://resolver.tudelft.nl/uuid:b5dd8289-4446-4e00-9b6b-2c1d652b9422","Stakeholder research CoVE Water SA: CoVE Water SA the umbrella for all stakeholders","Bos, Doortje (TU Delft Technology, Policy and Management); van den Broek, Maartje (TU Delft Civil Engineering & Geosciences); De Geus, Lara (TU Delft Transport and Logistics); Wielders, Suus (TU Delft Technology, Policy and Management)","Annema, J.A. (mentor); Scholten, L. (mentor); Jackson, Manuel (graduation committee); Hindley, Renoir (graduation committee); Delft University of Technology (degree granting institution)","2023","The water and sanitation sector faces well-documented issues that are challenging to address, leading to the establishment of the Platform of Vocational Excellence (PoVE) Water. This platform brings together five regional Centers of Vocational Excellence (CoVE) Water in Europe and South Africa to ensure high-quality skills and competencies in the water sector. These CoVEs facilitate collaboration among stakeholders, enabling the development of vocational education and training programs to increase awareness, responsiveness to industry needs, and address sector challenges. A few months ago, CoVE Water SA was established in South Africa to achieve the previously mentioned goals. Therefore, it is important that the following research question is answered in this initial set-up phase: What actions need to be taken to enhance the effectiveness of the CoVE Water SA?
To answer this research question, several important stakeholders were interviewed. Subsequently, the interviews were analysed thematically in order to extract the most important themes and quotes, PI grids were created to assess power and interest dynamics among stakeholders, and a Social Network Analysis was conducted to understand the CoVE Water SA network and potential clusters.
The research findings have unveiled key aspects for enhancing the effectiveness of CoVE Water SA. The current network in the water sector has a low density, implying that many collaborations are lacking. This leads to a high degree of interdependence within the network, resulting in a non dynamic system. The lack of collaborations, such as connections with TVET colleges, schools, farmers and local communities, results in a lack of knowledge, funding and connection to the labour market. Governmental stakeholders, like DWS, EWSeta, and BGCMA, have been identified as influential players with extensive networks and important resources, Local Authorities and Research Organizations also play important roles. Universities exhibit substantial international links, making them crucial contributors. These stakeholders have the potential to provide knowledge, collaboration, and power. These are valuable insights for CoVE Water SA, fostering network growth and effectiveness in the water sector.
Furthermore, six key themes have been derived from the conducted interviews, addressing the needs of stakeholders and where CoVE can make a valuable contribution.
These themes include raising awareness, reducing the skills gap in the water sector, fostering international collaborations, mitigating the labour shortage in the water sector, improving education material and establishing desired collaborations. For each theme, the interviewed stakeholders have presented their views and numerous suggestions on how CoVE Water SA can assist in addressing these issues. Additionally, stakeholders have also mentioned possible failures of CoVE Water SA, which can aid in preventing any shortcomings of the platform. Furthermore, stakeholders mentioned ongoing initiatives related to the six themes, through which they can contribute to the platform.
From the Thematic Analysis, PI Grids and the SNA, a set of actions have emerged that are essential for enhancing the effectiveness of CoVE Water SA. These actions revolve around expanding and enhancing the network, organising activities and contributing to educational improvement. In terms of broadening and strengthening the network, the platform should focus on enhancing the collaborations among educational groups, building stronger relations with international institutions in Europe and Africa, involving TVETs and schools within the water network, improving stakeholder involvement and encouraging the involvement of Local Communities to increase awareness and knowledge about water issues. Furthermore, CoVE Water SA should play a role in organising activities to raise awareness of Water Resource Management. Additionally, it should assist in improving curricula, supporting students’ preparation for the workforce and making the education more practical instead of only theoretical. CoVE Water SA should also provide training and learning resources as well as comprehensive courses.
However, this study recognizes several limitations that should be considered in future research and when implementing recommendations for CoVE Water SA. These limitations encompass factors like a limited scope due to resource and time constraints, minimal varied interviewee responses, and potential biases in responses. Addressing these limitations will be crucial in guiding future research and actions for CoVE Water SA.
After considering several design directions, it was determined to create a mechanism capable of mechanically pulling the needle tube out of the hub. A device like this will render needles unusable while simultaneously opening up possibilities for the recycling of the materials of needle waste. Additionally a device that mechanically separates the materials of needles does not currently exist.
Tensile tests were performed with various needle sizes and temperatures to better investigate this. There were no statistically significant differences between temperatures, although the results from 16 G needles differed significantly from the results from 20 G and 23 G needles. It was discovered that the device's minimum pulling force should be 500 N; this, along with information taken from several set standards and previous projects on needle devices, was then included into a set of requirements for the device.
After exploring several clamping, pulling, and combined mechanisms, a roller mechanism was chosen for the device. A functional prototype capable of extracting a needle tube from its hub was created. This prototype was then tested, and various experiments were carried out to try to enhance the design because needle tubes were still slipping in between the rollers on occasion, and some needle tubes broke off.
Adding other structures or a different material like rubber on the rollers did not result in better performance, and a knurling pattern worked best for creating grip on the needle tube. Adding a ridge did not improve the performance, however removing some material from both sides of the gap in Roller A did enhance performance temporarily. Making the rollers out of stainless steel 431 rather than 316 did not increase their performance; however, stainless steel 431 with a heat treatment did improve the performance and showed consistent test results. This final prototype, including the rollers made out of stainless steel 431 with a heat treatment was then used to do final verification and validation.
20 G needles could be pulled with the device consistently at a needle length of 33.8 mm, both wet and dry. 27 G needles however kept breaking off, both wet and dry. A design choice should be made here about if the device should be aimed at a smaller range of needles or a redesign should be made where different spring forces could be applied. The device showed not springback and no parts became trapped in the mechanism.
It was impossible to insert needles of various diameters at greater angles from the vertical of the aperture and 16 G needles did not fit into the device at all. A redesign is needed for this.
The average activation force of the device was 14.72 N and the distance from the hand holding the needle to the hand operating the device did not exceed 50 mm.
The cycle time per needle was still too long for the device. Further research is required to improve these parameters. The prototype did meet the weight and size requirements. The device did not have a sharps box attached to it, this should be added in a redesign.
If the rollers of the device are to be constructed of stainless steel 431, they should be made in India, since stainless steel 431 was not available in Nepal. The case, cubes, pushing plate, socket, spring axis, and lever may all be made in Nepal. Standard components, such as springs and bearings, may be obtained in India. However still choices and more research is needed in the area of where exactly the product should be produced and assembled.
More research is needed to determine how the metal components of needles may be recycled and how a device like this would work with different types of needles. Also researching if applying force to both rollers and a redesign either with a different spring of multiple spring forces should still be done.
More testing is needed to determine the pulling force and how many cycles the device can sustain. As well as a drop test, a tipping test on an angular surface and users tests.
Lastly research into how to incorporate a redesign where the syringe is also rendered unusable is needed, since this study only focused on making the needle part unusable by separating the materials.","Medical waste; Sharps; Sustainability; Nepal","en","master thesis","","","","","","","","","","","","Biomedical Engineering","",""
"uuid:c545eb66-b1aa-43dd-b3ad-eebcf5f03ec6","http://resolver.tudelft.nl/uuid:c545eb66-b1aa-43dd-b3ad-eebcf5f03ec6","Analyzing deformation of buildings using LiDAR point clouds obtained by a Mobile Laser Scanning System","Bos, Kirsten (TU Delft Civil Engineering & Geosciences)","van Leijen, F.J. (graduation committee); Lindenbergh, R.C. (mentor); Joosten, Peter (graduation committee); Delft University of Technology (degree granting institution)","2023","Unequal deformation of the soil can cause deformation or damage to buildings, like tilted facades or cracks in walls. This research investigates how deformation of a building can be analyzed using Light Detection And Ranging (LiDAR) data. Cyclomedia captures LiDAR data yearly in the Netherlands making it possible to analyze either one or multiple epochs of data. If deformation is monitored, failure can be predicted, and repairs can be performed in time.
A subsiding area is found using the Dutch surface motion map. The data points of a single building are fetched from the LiDAR point cloud to analyze the following types of deformation: a difference in the torsion and tilt angle of the facade between two epochs of data; the tilt angle of the facade for a single epoch of data; and local deformation patterns on the facade. The data is segmented before computing the angles and analyzing the local deformation patterns. During segmentation, points that do not correspond to the façade (like a sunshade or windows) are removed. After segmentation, the facade is modeled by fitting a plane using Principal Component Analysis (PCA). The plane parameters (A, B, C, D) are used to determine the torsion and tilt angles. If the torsion or tilt angles are large (above a degree), it is expected the facade has deformed. Local deformation patterns can be analyzed by using a raster containing the distance of the segmented points with an accuracy of 8 centimeters. Besides the point clouds, Cyclomedia also captures 360° panoramic images (Cycloramas). These Cycloramas can be used to explain patterns that are visible in the rasters. For example, objects in front of the building like a bench or a sunshade.
This research uses Random Sample Consensus (RANSAC) to segment the data. From the results, it can be concluded RANSAC is not very predictable because random points are taken as input. So, points corresponding to the facade can be removed instead of points corresponding to windows or doors. Therefore, it is recommended to use another segmentation method for future research instead of RANSAC. Machine learning could be a good alternative to remove objects like windows and other unwanted points from the data.","Point Clouds; Deformation Analysis; building facade; Mobile Laser Scanning","en","master thesis","","","","","","","","","","","","Geoscience and Remote Sensing","",""
"uuid:7e77d484-7f1e-4d95-ae86-d2a569d2e2c4","http://resolver.tudelft.nl/uuid:7e77d484-7f1e-4d95-ae86-d2a569d2e2c4","The impact of ESG characteristics on startup valuation: An empirical study in the Venture Capital setting","Bos, Thomas (TU Delft Technology, Policy and Management; TU Delft Economics of Technology and Innovation)","van de Kaa, G. (mentor); Khodaei, H. (graduation committee); Ralcheva, Aleksandrina (graduation committee); Delgado Medina, Fátima (graduation committee); Delft University of Technology (degree granting institution)","2023","This thesis serves as an attempt to establish the initial empirical linkage between environmental, social and governance (ESG) factors and startup valuation by venture capitalists. While substantial academic work has addressed the ESG topic and how firms’ ESG characteristics impact their financial performance and valuations, relatively little ink has been spilled on the issue in the entrepreneurial finance literature. An important impediment for researchers and for investors in the entrepreneurial finance markets wanting to adopt the practice of responsible investing has been the lack of a unified framework for the assessment and quantification of startups’ ESG characteristics. This thesis proposes a startup ESG framework that is based on the status quo of existing ESG frameworks and related literature. The study then analyses a proprietary dataset of 47 technological startups that seek funding from the Dutch venture capital (VC) firm FORWARD.one, to empirically investigate whether the positive relationship between firms’ ESG characteristics and financial valuation, found in the public market setting and the crowdfunding and token offering setting, also holds in the VC context. Multiple Linear Regression (MLR) analysis and Independent Sample t-Tests are used to examine the impact of the startups’ ESG risk scores on their financial valuations. The results indicate that the amount of ESG risk in a startup is negatively correlated to its financial valuation, meaning that venture capitalists do value startups’ ESG characteristics. As a result also those entrepreneurs that seek funding from venture capitalists have an economic incentive to work on their sustainability performance. However, this study finds that sustainability performance is only valued to the extent that it concerns ESG risk management, i.e. minimizing ESG-related negative externalities. The creation of ESG-related positive externalities is not valued by purely financially driven venture capitalists. The study does not attempt to establish a causal mechanism. The findings contributes to the still emergent literature around the role of ESG in entrepreneurial finance markets and several promising avenues for further research are suggested.","Startup; ESG framework; Financial valuation; Entrepreneurial finance; Venture Capital","en","master thesis","","","","","","","","","","","","Management of Technology (MoT)","",""
"uuid:460a8821-1125-43a6-9443-bb9e4d0c5231","http://resolver.tudelft.nl/uuid:460a8821-1125-43a6-9443-bb9e4d0c5231","Measuring Sensing Characteristics of Bending Electroactive Polymer Transducers","Bos, Joris (TU Delft Mechanical, Maritime and Materials Engineering)","Hunt, A. (mentor); Hassan HosseinNia, S. (graduation committee); He, S. (graduation committee); Delft University of Technology (degree granting institution)","2022","Electroactive polymers (EAPs) are smart materials that have electromechanical and mechanoelectrical transduction properties. They are flexible, lightweight, easy to shape and cheap to produce. These properties allow EAPs to be used as actuators or sensors in applications such as soft robotics, metamaterial structures, or other future technologies where the use of traditional transducers might not be feasible. Past research has mainly focused on the actuation property of EAP materials, while their sensing property has received less attention. For the implementation of EAPs as sensors in future technologies, detailed characterisation of their sensing performance is essential. The sensing characterisation in current literature was found to be of poor quality. Most of the studies that investigated the sensing performance of EAP materials did not accurately describe the deformation imposed on their samples and focused mainly on a narrow window of frequencies for dynamic characterisation. The aim of this thesis is to address this gap in the literature and develop a method to obtain detailed sensing characteristics of EAP cantilever samples during bending. This is done by designing a bending characterisation setup that can bend EAP cantilever samples in their first bending mode for a range of different frequencies.
This setup is then used to characterise the sensing performance of an IPMC sample by obtaining the sensitivity, phase delay, coherence, signal-to-noise ratio, repeatability and stability, for a frequency range of 0.1 to 20 Hz. These characteristics were determined for both active and passive sensing methods under identical conditions, which allowed these methods to be directly compared. It was concluded that the quality of the measurements was good as the coherence and SNR values were higher than those of previous studies. The successful characterisation of the IPMC sample demonstrated that the bending setup can be effectively used to compare the performance of new samples in the future.","Electroactive polymers; EAP; IPMC; Sensing characterisation; Bending transducer","en","master thesis","","","","","","","","2024-11-04","","","","Mechanical Engineering | Mechatronic System Design (MSD)","",""
"uuid:1f2f8fdc-dca9-46e0-a669-1d4f7c5170a5","http://resolver.tudelft.nl/uuid:1f2f8fdc-dca9-46e0-a669-1d4f7c5170a5","Image-based Video Search Engine: Keyframe Extraction","Bos, Robert (TU Delft Electrical Engineering, Mathematics and Computer Science); Zheng, Leo (TU Delft Electrical Engineering, Mathematics and Computer Science)","Dauwels, J.H.G. (mentor); Llombart, Nuria (graduation committee); Bol, E.W. (graduation committee); Delft University of Technology (degree granting institution)","2022","In this report, the analysis and design of a system that extracts keyframes from videos is detailed. The need for such a sub-module stems from the similarity of frames in a video. To aid in reducing the computation time of the content based video search engine, the Keyframe Extraction Module reduces the amount of frames by discarding frames that are similar in information. Determining what frames can be considered similar is one of the main challenges, as there are many ways of assigning values to how much frames differ. In the past decades, many research has been done on keyframe extraction and video summarization and many methods are proposed to form keyframe selections, varying in what is considered salient information and varying in computation time. The most challenging part of the design is that there is a time constraint present, which called for a proper analysis in what methods are suitable. After all, this limitation when creating video summaries is often not a large topic in research papers.This report will cover Shot Detection techniques along with various Keyframe Extraction methods that can be categorized in clustering, visual content, fixed selection and uniform sampling. Furthermore, evaluation methods like the Fidelity measure for the performance of particular methods are also addressed, as determining how well a keyframe selection is is not trivial. It is concluded that out of the techniques analyzed, a combination of VSUMM clustering and histogram matching along with histogram-based shot based detection with a CFAR threshold and pre-sampling is most suitable for the general case under a time constraint. Future work could include looking at hierarchical clustering methods and optimizing the Shot Boundary Detection module following the most recent papers.
The effect of the following sound-reducing measures are studied: the material properties of the material CLT, additional linings on the room separating elements, use of elastic interlayers between CLT panels and the type and number of connectors connecting the CLT panels. These are all common sound-reducing measures for lightweight constructions. The effect of the material properties of the CLT and the effect of additional linings are computed by a numerical direct sound transmission model. The effects of elastic interlayer and connectors between the CLT panels are computed with a numerical vibration reduction index model. The results of the numerical models are compared to measurements found in literature and the sound transmission according to the ISO standard.
The results showed the importance of Young’s modulus in the y and z-direction, these influence the location of the resonance induced dips in the sound insulation. The internal loss factor of the CLT panels influenced the height of the dips. A loss factor of 20 % resulted in results most similar to the measurements. The direct sound transmission through a bare CLT panel can be predicted within a range of 3 dB difference with measurements. The prediction of the ISO standard is within a range of 5 dB with the measured values.
The vibration reduction index between panels without interlayers is modelled with frictional contact regions between the panels. The numerical results showed similarities with the measurement results for the vibration reduction index of panels with screwed connectors. The ISO standard significantly overpredicts the vibration reduction index of CLT junctions. The effect of the elastic interlayer showed insignificant improvements in the frequency range 50-500 Hz, the additional reduction stays below 3 dB. The ISO standard does not include a method to determine the effect of elastic interlayers or connectors between CLT panels.
The numerical models prove that is possible to predict the low-frequency sound transmission in CLT apartments. Important notes are that the CLT lamellas need to be modelled separately. Only in this way the model is able to capture the sound that goes through a structure within a range of 3 dB. In order to test the effect of additional lining, the material properties need to be known.
The vibration transmission between panels in the junctions is more complex, as it depends on more design parameters. A frictionally bonded contact region between the panels results in vibration reduction indices that are in line with measurement results of panels with several connectors. The effect of the elastic interlayer is minimal in the low-frequency range, but the results are similar to measurement results. Both the direct sound transmission model and the vibration reduction model were influenced by the boundary conditions.
In order to overcome limited generalisability, a hybrid semantic segmentation framework is presented that can switch between different operation modes. The hybrid framework contains multiple environment-specific segmenters. For each input frame, the hybrid framework selects an environment-specific segmenter, based on a decision parameter. In this work, two hybrid frameworks containing different decision parameters are designed. The first hybrid framework contains multiple Bayesian segmenters, which quantifies prediction uncertainty in addition to the pixel-wise classification. This uncertainty quantification is obtained by Monte Carlo sampling to generate a posterior distribution of pixel class labels. The second hybrid framework consists of multiple environment-specific segmenters and autoencoders. Every segmenter has a corresponding autoencoder trained on the same environmental dataset. The output of the environment-specific autoencoder is a reconstructed image of the input image. The error between the original input image and the reconstructed image is used as a decision parameter for selecting the best performing segmenter.
We experimented with a hybrid segmentation framework and observed that it could outperform a single semantic segmentation network with a 2.6% Intersection over Union increase. The hybrid framework with the autoencoder approach resulted in a model selection precision of 99.3% on all the test images. Therefore, we can conclude that UGV navigation can benefit from a hybrid semantic segmentation framework.","Deep Learning; Convolutional Neural Networks (CNNs); Bayesian Neural Networks (BNNs); Semantic Segmentation","en","master thesis","","","","","","","","","","","","Mechanical Engineering | Systems and Control","",""
"uuid:36aacf62-1a8e-4be0-a91d-8e11cc39b55b","http://resolver.tudelft.nl/uuid:36aacf62-1a8e-4be0-a91d-8e11cc39b55b","Brain inspired state and input observer for a drone in wind conditions","Bos, Fred (TU Delft Mechanical, Maritime and Materials Engineering; TU Delft Cognitive Robotics)","Wisse, M. (mentor); Anil Meera, A. (mentor); Kok, M. (graduation committee); Ferranti, L. (graduation committee); Delft University of Technology (degree granting institution)","2021","The free energy principle is a recent theory that originates from the neuroscience. It provides a unified framework that combines action perception and learning in the human brain. This research aims to implement the perception aspect of the free energy principle into robotics. This is achieved via the dynamic expectation maximisation (DEM) algorithm. DEM is derived from the free energy principle and provides a novel solution for state and input observation for LTI systems under the influence of coloured noise. This thesis provides an overview of how the DEM observer is derived from the free energy principle. Thereafter, an experimental design is presented in which data is collected to validate the performance of DEM on experimental data. The data is collected from a quadcopter drone flying in wind conditions. A detailed overview of the DEM observer settings is presented and motivated. \\ This research shows that because of its use of generalized coordinates DEM is able to leverage the coloured nature of the noise for better state estimation. This is demonstrated by the fact that DEM obtains a higher state estimation accuracy than other coloured noise state observers, such as state augmentation and SMIKF. Moreover, in input estimation, DEM is able to obtain similar results as an unknown input observer. Finally, the accuracy vs complexity trade off of DEM is highlighted.","Active Inference; State Estimation; Drones","en","master thesis","","","","","","","","","","","","Mechanical Engineering | Biomechanical Design - BioRobotics","",""
"uuid:0926ffde-d641-450f-b800-e993c9ced40e","http://resolver.tudelft.nl/uuid:0926ffde-d641-450f-b800-e993c9ced40e","Topology optimization for ship structures with manufacturing constraints","Bos, Dennis (TU Delft Mechanical, Maritime and Materials Engineering)","Walters, C.L. (mentor); Delft University of Technology (degree granting institution)","2021","Currently, most ships are designed on the basis of rules and reference ships for which often only the critical structural parts are calculated and designed in detail. This process can result in an over-dimensioned ship with the standard structural outcome of longitudinal stiffeners, transverse stiffeners, and bulkheads with a fixed distance due to ease of manufacturing. With the use of finite element analysis (FEA), the complete structure of a ship is analyzed against prescribed loads, which facilitates the determination of the detailed dimensions of all stiffeners and plates within a reasonable lead time and could result in better engineering in the form of a lighter ship. In addition, the most common structural forms could be optimized by replacing them with unique and optimal shapes. Topology optimization (TO) uses FEA, and it facilitates unique structural shapes. TO generates an optimized material distribution for a set of loads and constraints within a given design domain. The result can be used to inform the design of an improved part. Although the results provide helpful insight, they often cannot be used literally, as they are organic and cannot be manufactured with typical steel shipbuilding methods. The objective of this study is to research the possibility to design the structure of a steel midship with TO where the resulting structural form is manufacturable using steel-cut plates and cost-effective from a shipbuilding perspective. However, constraints that result in a manufacturable structure that can be made cost-effectively from steel-cut plates have not been developed and implemented in TO. To meet the objective, this project was initiated in cooperation with C-Job and the University TU Delft. The methodology was established based on a software comparison followed by an extensive trial and errortesting process. The study was executed in a case study for which the domain concerned the midsection of a 203m offshore vessel named Orion, as TO could result in substantial computational time such that analyzing a hull section is more efficient. The optimization was performed in multiple iterations with different design objectives using the method of Solid Isotropic Material with Penalization (SIMP). After a baseline comparison, the manufacturing constraints were implemented and developed. Despite the availability of manufacturability constraints, it is currently not possible with the software used in this study to design the complete structure of a steel midship. However, it can be very useful to employ TO as a suggestion early in the design process, as this can result in manufacturable structures (see Figure 77). The TO software used in this study can help designers with structural suggestions in the basic design phase when there are fewer design limitations. This case study resulted in unusual 45-degree, X-shape components that are highly efficient for sustaining shear loads and which resulted in a weight reduction of the mid-section of 2.4%. In addition, the result shows that unique structural shapes under various angles can result in an optimal strength-weight design rather than in orthogonal structural parts with a fixed span.","Marine Technology; Topology optimization; Ship; Structure; Manufacturing constraints","en","master thesis","","","","","","","","","","","","Marine Technology","",""
"uuid:8df0045a-3673-4fcc-958d-5a12052af1ee","http://resolver.tudelft.nl/uuid:8df0045a-3673-4fcc-958d-5a12052af1ee","Building a Fair Transition: Creating a fair circular built environment in the Dutch province of South Holland","KARADIMITRIOU, IOANNA (TU Delft Architecture and the Built Environment); YUAN, BOWEN (TU Delft Architecture and the Built Environment); Demetriadou, Leto (TU Delft Architecture and the Built Environment); van Esch, Marieke (TU Delft Architecture and the Built Environment); Bos, Hannah (TU Delft Architecture and the Built Environment)","Qu, L. (mentor); Wandl, Alex (mentor); Newton, C.E.L. (mentor); Delft University of Technology (degree granting institution)","2021","“Building a Fair Transition” strives for a fair circular built environment in the Dutch province of South Holland. By 2040 South Holland aims to have built 210.000 new dwellings to meet the rapidly growing housing demand. This transition in the built environment should align with current climate agreements and be as energy neutral as possible. To meet these goals, a lot of material and renewable energy are needed. However, the current linear economy creates inequalities for current and future generations. Therefore, radical changes towards circular construction and the demolition sector are needed. At the same time, energy poverty is an issue that calls for immediate actions in order to make the much-needed transition truly sustainable. Nevertheless, the country lacks a comprehensive measurement framework that considers social aspects to address the phenomenon. The main research question is how to manage the transition in South Holland towards a circular built environment while ensuring that this transition is done in a fair way. In order to make this possible, a tremendous change in organisational structures is required. An interscalar approach is needed to create a symbiosis betweenthe regional scale and the actions needed at a local level. In this work, bottom-up initiatives are encouraged and embraced within a bigger top-down mainframe. Through an assessment analysis, the goals towards a sustainable built environment are classified into three categories: materials, energy and knowledge. These goals will strengthen the social foundation of our report and fit the ecological ceiling that all development must respect. In our work, phasing of interventions is based onthe urgency needed. In that sense, actions are prioritisedin the most vulnerable areas while pilot projects serve as the research ground for testing feasibility and potential upscaling. The most urgent areas will be addressed first according to the criteria of low liveability, building energy performance, low income and ownership status.The overall goal of this strategy is to create a just sustainable built environment characterised by circular material flows and fair energy transition. More precisely, the aim is to strive for affordable and adequate housing for all, a regenerative and stable labour market and knowledge exchange. Concerning material flows, the target of closed material loops is achieved through renewable raw materials used, upcycling of wasteflows and optimal use. Finally, democratisation of energy has become a key theme. Supply and demand for renewable energy sources is controlled to minimise energy losses. A decentralised energy system enables every citizen to become a prosumer of energy leading thus to democratisation of energy.","circular economy (CE); social justice; inclusive energy transition; Material Flow; South Holland","en","student report","","","","","","","","","","","","Architecture, Urbanism and Building Sciences | Urbanism","AR2U086 R&D Studio – Spatial Strategies for the Global Metropolis",""
"uuid:3faf874e-da26-4421-9cbd-f84756d4dd6d","http://resolver.tudelft.nl/uuid:3faf874e-da26-4421-9cbd-f84756d4dd6d","Windows for Circularity: An analysis to identify circular interventions in the different stages of the design process of an office building","Bos, Rosa (TU Delft Civil Engineering and Geosciences)","Schraven, D.F.J. (mentor); Hertogh, M.J.C.M. (mentor); Bergsma, A.C. (graduation committee); Huurman, W. (graduation committee); Delft University of Technology (degree granting institution)","2020","2020 is a strange and disruptive year. The pandemic virus COVID-19 controls people’s lives. It influences the way we live, love, and work. Offices are empty while people work from home. When, and if people are going to work in an office again like they were used to, is the question. The events of 2020 are an extra showcase that the way we use offices is subject to change. Therefore, offices should be designed in a way that they are adaptable, reusable, and can respond to changing needs. Circular design can help to make our offices future-proof. However, since the circular economy gained attention in the office building sector, only limited progress has been accomplished. A problem within the office building sector is that insight into the possibilities of circular design is lacking. Moreover, in literature there is no circular design model specific for the building industry. Therefore, this research aims to develop a decision support tool that stimulates the communication between client and designer and provides clarity about the possibilities of circular design. This resulted in three main insights. First, a building consists of different layers with different lifespans that should be able to be refurbished, replaced, and recycled without damaging other layers. Consequently leading to an extended lifespan of the complete building and increased adaptability and reusability. Second, practical circular interventions can be categorized into four themes which are based on circular theory. Those themes are adaptability, reusability, materials, and process. Third, decisions regarding circularity should be taken early in the design process. Especially when the lifespan of the building layer is long. Understanding which possible interventions could be taken in what stage of a design process helps prioritising them and thus creating windows for circularity.","Circular Economy; office building sector; Design for Circularity; Decision Support Tool","en","master thesis","","","","","","","","2020-09-22","","","","Civil Engineering | Construction Management and Engineering","",""
"uuid:d1b1952a-47a8-4586-a93b-08aeb97ecbb6","http://resolver.tudelft.nl/uuid:d1b1952a-47a8-4586-a93b-08aeb97ecbb6","Crops As Time-Invariant Keypoints","Bos, Martijn (TU Delft Electrical Engineering, Mathematics and Computer Science)","Budko, Neil (mentor); Verhoeff, E. (mentor); Vuik, Cornelis (graduation committee); Remis, Rob (graduation committee); Delft University of Technology (degree granting institution)","2020","In this paper, a method is proposed to automatically correct misalignment of orthophotos in time-series caused by an inaccurate geotransform. The proposed method relies on common literature concepts such as keypoint identification, keypoint matching, and model fitting using random sample consensus (RANSAC). Traditional keypoint identification methods such as the scale invariant feature transform (SIFT) are not suited for this problem as no real scale- or rotation-invariance is required, instead, time-invariance is required. To achieve this, crops are suggested as keypoints, and two different keypoint descriptors are put forth. The first descriptor is based on the shape and size of the crops, while the alternative descriptor is based on the planting pattern of crops. The method, and both descriptors, generate promising results for certain scenario's. However, in later growth stages performance drops significantly as the identification of crops -required beforehand- becomes troublesome due to dense growth.","computer vision; feature detection; keypoints; orthophoto","en","master thesis","","","","","","","","","","","","","",""
"uuid:7ddd6ce3-831c-4ae3-96b3-9dc5bb5079bd","http://resolver.tudelft.nl/uuid:7ddd6ce3-831c-4ae3-96b3-9dc5bb5079bd","Nonlinear dynamics of graphene membranes: Quality factor limits of membranes caused by mode interaction","Bos, Vincent (TU Delft Mechanical, Maritime and Materials Engineering)","Steeneken, P.G. (mentor); Alijani, F. (graduation committee); van Horssen, W.T. (graduation committee); Delft University of Technology (degree granting institution)","2020","Graphene is expected to open up a world of new possibilities in the field of micro and nano sensors, due to its outstanding properties. However, graphene membranes suffer from high damping which limit their performance. The physical mechanism behind this damping is still unknown. Therefore, in this work, it is investigated how coupling between eigenmodes due to nonlinear stiffness causes damping. Besides, a method to construct this nonlinear stiffness for reduced order models is improved. Using this, numerical simulations are compared to experimental results for validation.","Nonlinear dynamics; graphene membrane; mode coupling damping","en","master thesis","","","","","","","","2023-08-18","","","","","",""
"uuid:8e9a3b1e-d4f3-4b5e-9a6c-5c177dba91b2","http://resolver.tudelft.nl/uuid:8e9a3b1e-d4f3-4b5e-9a6c-5c177dba91b2","Akka Decision Engine: An actor based decision engine on the DMN 1.1 specifications","Acda, Mark (TU Delft Electrical Engineering, Mathematics and Computer Science); de Boer, Toon (TU Delft Electrical Engineering, Mathematics and Computer Science); Bos, Thomas (TU Delft Electrical Engineering, Mathematics and Computer Science)","Poulsen, Casper (mentor); Delft University of Technology (degree granting institution)","2019","Decision engines can decide from a certain input what the output should be. This is done in a table with columns for inputs and outputs and rows for a combination of inputs together with its corresponding output. A row is also called a rule. A simple program to decide such a decision table can easily be made, like Camunda. However, when the output of one table is also the input of another table and so on and the amount of rules get enormously big, the problem gets more complicated and Camunda takes a very long time to solve such structures.
We created a decision engine in Scala that can decide the output when there are thousands of tables linked together in less than a minute with the help of Akka. Akka is an actor model, which means that it can create multiple actors, which each can perform a certain task. Actors can run in parallel, which speeds up the decision engine. Actors send messages to each other and an actor will only start working when they receive a message. The decision engine reads DMN files and parses it to tables. For better performance the decision tables get parsed into a tree structure with for every table the input tables are its children. In this way the decision engine is very quick in solving tables, however the parsing into trees still takes some time. This is not a big problem, since the parsing is only done once and the tree can be saved and the solving can be done very often. Also the deciding of a single table is improved, because we created our own FEEL-expressions that can decide the rules very fast. The result is that after a very large table with 50,000 rules is parsed, the solving that took Camunda 400 milliseconds only takes 9 milliseconds for the new decision engine and when the parsing is left out, the new engine is faster in computing 500,000 rules than Camunda with 1 rule. Also when the parsing is included in the time, the difference gets only bigger. For 50,000 rules, Camunda takes 20 seconds to parse the file and solve the table, while the new decision engine takes only a little more than 1 second to do this all. When the files get larger, so does the difference.","Decision Engine; Akka; Camunda","en","bachelor thesis","","","","","","","","","","","","","",""
"uuid:52bf4500-6be5-42b2-857d-8d7f66ac1be5","http://resolver.tudelft.nl/uuid:52bf4500-6be5-42b2-857d-8d7f66ac1be5","Craft Centre: Craft Center in Building Construction","Bos, Rogier (TU Delft Architecture and the Built Environment)","Schreurs, E.P.N. (mentor); Stuhlmacher, M.E. (graduation committee); Rosbottom, D.J. (graduation committee); Thys, T.J.M. (graduation committee); Cornelisse, F. (mentor); Delft University of Technology (degree granting institution)","2019","","","en","master thesis","","","","","","","","","","","","","",""
"uuid:09f32632-04eb-4907-9100-766590dc2d03","http://resolver.tudelft.nl/uuid:09f32632-04eb-4907-9100-766590dc2d03","Including traffic light recognition in general object detection with YOLOv2","Bos, Evert (TU Delft Mechanical, Maritime and Materials Engineering)","Kooij, J.F.P. (mentor); Pool, E.A.I. (graduation committee); Gavrila, D. (graduation committee); Kober, J. (graduation committee); Delft University of Technology (degree granting institution)","2019","With an in vehicle camera many different things can be done that are essential for ADAS or autonomous driving mode in a vehicle. First, it can be used for detection of general objects, for example cars, cyclists or pedestrians. Secondly, the camera can be used for traffic light recognition, which is localization of traffic light position and traffic light state recognition. No method exists at the moment able to perform general object detection and traffic light recognition at the same time, therefore this work proposes methods to combine general object detection and traffic light recognition. The novel method presented is including traffic light recognition in a general object detection framework. The single shot object detector YOLOv2 is used as base detector. As general object class dataset COCO is used and the traffic light dataset is LISA. Two different methods for combined detection are proposed: adaptive combined training and YOLOv2++. For combined training YOLOv2 is trained on both datasets with the YOLOv2 network unchanged and the loss function adapted to optimize training on both datasets. For YOLOv2++ the feature extractor of YOLOv2 pre-trained on COCO is used as feature extractor. On the features LISA traffic light states are trained with a small sub-network. It is concluded the best performing method is adaptive combined training which reaches for IOU 0.5 a AUC of 24.02% for binary and 21.23% for multi-class classification. For IOU of 0.1 this increases to 56.74% for binary and 41.87% for multi-class classification. The performance of the adaptive combined detector is 20% lower than the baseline performance of an detector only detecting LISA traffic light states and 5% lower than the baseline of a detector only detecting COCO classes, however detection of classes from both dataset is almost twice as fast as separate detection with different networks for both datasets.","Traffic Light recognition; machine learning; YOLO; object detection; COCO; LISA","en","master thesis","","","","","","","","","","","","Mechanical Engineering | Vehicle Engineering","",""
"uuid:3485b873-142c-4987-b6d8-f53390cf7919","http://resolver.tudelft.nl/uuid:3485b873-142c-4987-b6d8-f53390cf7919","Numerical Simulation of Radial Non-Newtonian Foam Flow in a Reservoir","Bos, Martijn (TU Delft Civil Engineering and Geosciences)","Rossen, Bill (mentor); Salazar Castillo, Rodrigo (mentor); Delft University of Technology (degree granting institution)","2017","Non-Newtonian foam flow in a reservoir can be modeled numerically by discretization of the corresponding analytical formulas. The injection of foam is compared to the injection of water by comparing the injection pressures, which is represented as a dimensionless pressure rise at the injection well. The model first applies the forward-difference method to compute the changes in water saturation over space and time as the foam is injected. These changes in water saturation are related, via Darcy’s Law, to changes in dimensionless pressure. The non-Newtonian foam behavior is implemented in the model by making the gas relative permeability a function of position in radial flow, based on the exponent defined for a power law fluid.
The validity of the model is assessed by a comparison with an analytical model using the method of characteristics to simulate Newtonian foam flow. This model was created by A.H. Al Ayesh. From this comparison, it follows that the numerical model converges to a correct solution for sufficient fine discretizations. Finer discretizations do however introduce drawbacks, such as long computation times and high computer-memory requirements. Another drawback of the numerical model is the inevitable error that is introduced by a numerical artifact in the computation of the total relative mobility in each grid block at the front as foam advances. This error can only be reduced by even-finer discretizations.
The validity of the model for non-Newtonian foam flow simulations is not assessed directly in this thesis. But the model is expected to have similar or coarser grid-refinement criteria for shear-thinning foam flow, and finer or similar grid refinement criteria for shear-thickening foam flow.","Petroleum Engineering; Enhanced Oil Recovery; Foam; Numerical Simulation; Numerical Modelling","en","bachelor thesis","","","","","","","","","","","","Applied Earth Sciences","",""
"uuid:c0a208a8-d012-450e-9c07-f23a39910855","http://resolver.tudelft.nl/uuid:c0a208a8-d012-450e-9c07-f23a39910855","Towards Natural Language Understanding using Multimodal Deep Learning","Bos, S.","Hendriks, E.A. (mentor)","2017","This thesis describes how multimodal sensor data from a 3D sensor and microphone array can be processed with deep neural networks such that its fusion, the trained neural network, is a) more robust to noise, b) outperforms unimodal recognition and c) enhances unimodal recognition in absence of multimodal data. We built a framework for a complete workflow to experiment with multimodal sensor data ranging from recording (with Kinect 3D sensor), labeling, 3D signal processing, analysing and replaying. We also built three custom recognizers (automatic speech recognizer, 3D object recognizer and 3D gesture recognizer) to convert the raw sensor streams to decisions and feed this to the neural network using a late fusion strategy. We recorded 25 particpants performing 27 unique verbal and gestural interactions (intents) with objects and trained the neural network using a supervised strategy. We proved that the framework works by building a deep neural networks assisted speech recognizer that performs approximately 5% better with multimodal data at 20 dB SnR up to 61% better with multimodal data at -5 dB SnR while performing identical to the individual recognizer when fed a unimodal datastream. Analysis shows that performance gain in low acoustic noise is due to true fusion of classifer results while gain at high acoustic noise is due to absence of speech results as it cannot detect speech events anymore, while the gesture recognizer is not affected. The impact of this thesis is significant for computational linguists and computer vision researchers as it describes how practical issues with (real and) real-time data can be solved such as dealing with sensor noise, GPU offloading for computational performance, 3D object and hand tracking. The speech-, object- and gesture recognizers are not state-of-the-art and the small vocabulary with 27 unique phrases and 9 objects can be considered a preliminary experiment. The main contributions of this thesis project are a) validated multimodal fusion framework and workflow for embodied natural language understanding named MASU, b) 600GB, 2,5 hour labelled multimodal database with synchronous multi channel audio and 3D video, c) algorithm for 3D hand-object detection and tracking, d) recipe to train a deep neural network model for multimodal fusion and e) demontrate MASU in practical real-time scenario.","Speech Recognition; Object Recognition; Gesture Recognition; Natural Language Understanding; Artificial Intelligence; Multimodal Learning; Deep Neural Networks","en","master thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Intelligent Systems","","Computer Science","",""
"uuid:0ca23d29-2338-46fc-b55e-35613372586c","http://resolver.tudelft.nl/uuid:0ca23d29-2338-46fc-b55e-35613372586c","Hydrodynamic load simplification: Through Ultimate Strength of a Stiffened Panel","Bos, R.W.","Kaminski, M.L. (mentor); Bogaert, H. (mentor)","2015","Stiffened panels at the water line of a ship experience in-plane loads due to ship bending and torsion, as well as out-of-plane loads due to wave impacts. Wave impacts weaken the panel with respect to in-plane loads, but are hard to predict because of complex physics. The in-plane strength of the panel supports the surrounding ship structure. Hence, it is important to know in what detail the wave impacts should be determined, while making minimum error in the in-plane ultimate strength. The importance of load details is evaluated as follows. First, the complex loading is applied to the structure and the ultimate strenght of the structure is evaluated. Then, details of the load are omitted, in this case by changing the resolution of the load. Finally the effect of omission of details becomes clear, by comparing the ultimate strength of different wave impact load resolutions. Non-linear finite element calculations are performed to assess the unloaded ultimate strength, as well as the ultimate strength for different load resolutions. The load is a breaking wave on a rigid wall. Applied resolutions range from 0.1 m to uniform pressure over the stiffened panel. It is found that the ultimate strength under static loading either over- or underpredicts the ultimate strength of the panel independent of resolution. Further, the ultimate strength under a dynamic uniform loading is also not representative. Different resolutions are, again, of minor influence. Tests with a different panel confirm the findings. It is therefore concluded that, for the load and structure under investigation: there is little effect of load resolution, as long as it grossly resembles the pressure map. Dynamic calculations should be performed at all times.","stiffened panel; wave impact; ultimate strength; load simplification","en","master thesis","","","","","","","","2015-10-14","Mechanical, Maritime and Materials Engineering","Maritime and Transport Technology","","Ship and Offshore Structures","",""
"uuid:22ad247d-c1af-43a6-94c9-ee38ef787e86","http://resolver.tudelft.nl/uuid:22ad247d-c1af-43a6-94c9-ee38ef787e86","How can scarcity be used to prolong the process of hedonic adaptation?","Bos, Z.C.","Saärksjarvi, M.C. (mentor); Cankurtaran, P. (mentor)","2015","Consumer happiness is one of the things every company wants to create. They want people to be happy with their products and services since that leads to a positive association with the brand. After buying products or services people are “happy” about their new possession, it gives them an added value. This increase in happiness will not last permanently and mostly fade away. This is called the hedonic adaptation. In the beginning people have a visual growth in happiness and this slowly turns into satiation and the happiness level will return to its original state. Thus, the aim of the study was to explore whether scarcity has an effect on the hedonic adaptation and what factors are causing this prolongination?","scarcity; hedonic adaptation; marketing tool; margeting strategy; research","en","master thesis","","","","","","","Campus only","","Industrial Design Engineering","Product Innovation Management","","Master of Science Strategic Product Design","",""
"uuid:deab9320-633d-441f-9f53-b4fa981e6f30","http://resolver.tudelft.nl/uuid:deab9320-633d-441f-9f53-b4fa981e6f30","Hygienic design of moving elements in the food and beverage industry: The development of a double-acting muscle actuator","Bos, P.","Ninaber van Eyben, B. (mentor); Mul, E.J.T. (mentor); Koudijzer, J. (mentor)","2015","The food and beverage industry often uses pneumatic cylinders to enable machinery in food processing plants to move. The requirements around hygiene are strict. This is to prevent consumer food from getting contaminated with pathogenic microorganisms. The food itself and the intensive chemical cleaning products used, form a harsh environment for the machinery. This project focussed on the design of a hygienic movement that can replace Festo’s pneumatic cylinders and will function in the environment of the food and beverage industry. A double-acting artificial muscle with high initial forces is developed. Festo’s current artificial muscle, the Fluidic muscle, generates a high initial force while contracting. This muscle makes a hygienic movement, because there are no sliding parts, but it can only deliver a pulling force. During this project, an origami inspired bellow is developed that delivers a pushing force inside the Fluidic muscle. The origami structure provides extra force because it is a mechanical force amplifier. During the project, the Nature Inspired Design (NID) method is used. NID aims to design products with a positive impact. It takes inspiration from nature to develop economically and ecologically profitable designs. The method ensures the context around the product is taken into account. A proof of principle of the origami bellow is given with the help of a prototype. Recommendations are given regarding materials, production techniques and further prototyping possibilities to come to a design that pushes the food and beverage industry a bit further on its way in using more hygienic, environment friendlier and recyclable products.","hygienic design; pneumatic; actuator; food industry","en","master thesis","","","","","","","Campus only","","Industrial Design Engineering","Industrial Design","","Master of Science Integrated Product Design","",""
"uuid:498466be-1547-4b89-b28c-c006848bfcdc","http://resolver.tudelft.nl/uuid:498466be-1547-4b89-b28c-c006848bfcdc","Evaluation of Intermediate Refueling Stops in Long-Haul Flight Operations","Bos, F.","Hartjes, S. (mentor); Visser, H.G. (mentor)","2014","The aviation sector has suffered a big blow from the series of recent economic depressions. Airlines are struggling to stay in business and are looking for multiple ways to cut on expenses. This has led to the initiation of studies to find strategies which will reduce an airline’s overall fuel consumption. One of these methods is to initiate intermediate refueling stop operations on long-haul flights. This means that instead of flying with a fully fueled aircraft from e.g., Amsterdam to Tokyo, the route is split into two or more segments which are flown with the appropriate amount of fuel and possibly even different aircraft types more suitable for shorter range flight. By developing a novel computer model, this research aims at finding the answers to the following questions: What are the fuel consumption- and emission savings that can be attained by implementing this model on specific routes and with specific aircraft types? What are the route requirements to optimally benefit from operating flights with intermediate refueling stops? Which costs are directly linked to introducing refueling stops, what are the consequences and what can be done to reduce these costs? How does this concept influence the airport groundside operations and what is the impact on the airport infrastructure? The model consists of two independent programs which work in cohesion to find the optimal stopover airport for a specific route operated by a specific aircraft. The first program is the aircraft model, which is capable of calculating the fuel consumption on a specific mission. The calculations are based on the fundamentals of flight and the equations of motion. In total three aircraft types are incorporated and together cover short-, medium- and long range operations. The second program is the route model which is able to identify the costs for a specific segment and determines the optimal route by use of a modified version of the Dijkstra Algorithm and an airport database of ILS Cat. II/III equipped airports. This model computes a buffer zone in which to look for intermediate stop airports and selects the most advantageous option, based on local waiting times, landing- and navigation fees and fuel prices. The results show that on routes suitable for intermediate stop operations, the fuel reduction ranges from 5% - 10%. For the total cost reduction, these values are around 2% - 4% per flight. These figures strongly depend on the mission conditions and stopover position. Besides the fuel price and stopover time, the wind velocity and direction also have a vital role in the feasibility of the concept.","Aviation; Fuel Consumption","en","master thesis","","","","","","","","","Aerospace Engineering","Control and Operations","","Air Transport and Aerospace Operations","",""
"uuid:bf3d50eb-c103-4867-a625-b1a6c98b714b","http://resolver.tudelft.nl/uuid:bf3d50eb-c103-4867-a625-b1a6c98b714b","Multidisciplinaire zorg voor kwetsbare ouderen: Ontwerp en capaciteitsbepaling van een poliklinisch proces in het Reinier de Graaf Gasthuis","Bos, J.","Veeke, H.P.M. (mentor); Fransen, A.E.P. (mentor); Boomkens, H.R. (mentor)","2014","The Reinier de Graaf Hospital in Delft has concluded that care for frail elderly with impaired mobility is not always optimal. Due to multimorbidity, traditional monodisciplinary care is not the best possible care. The Reinier de Graaf Hospital set out to improve their care process to serve the frail elderly best. It was found that the target group has a high risk for functional decline, dependence and reduced quality of life. Thus the target group can benefit from short admission and throughput times. In order to deliver the best possible care, multidisciplinary collaboration is found to be essential. Using soft and hard systems theory combined with thorough data analysis, the current process was evaluated. It was found that the average combined admission and throughput time was 196 days for the target group, in this period a patient visited the hospital 8,6 times. The hospital visits were found to be predominantly for outpatient care. The multidisciplinary care was largely delivered in a sequential manner. This leads to a lack of collaboration between medical specialist, to unnecessary long throughput times and to many hospital visits. To improve the quality of the health care logistics, improvements have been proposed in a process redesign. Instead of delivering care in a sequential manner, the redesign allows for parallel multidisciplinary treatment. In order to do so, a triage appointment is suggested at the start of the care route and appointments with multiple medical specialists should be clustered on a single day. Short admission and throughput times can be achieved by reserving capacity based on expected patient flow. By means of data analysis the expected future input volume is set at 14 patients per week and the mean capacity required was calculated accordingly. To assess the performance of the proposed design under stochastic influence, a discrete event simulation was developed and verified. The simulation results indicate that if 110% of the theoretical capacity is used, for the average patient the throughput time can be reduced by 50% to 73%, depending on the average wait time between visits. On average a simulated patient visited the hospital 4,4 times for 6,7 appointments. The cost for these improvements are an average occupancy drop for medical doctors of 15%.","health care; logistics; delft systems approach; simulation; discrete event simulation; logistiek; ziekenhuis; Reinier de Graaf; simulatie; care route; zorgroute","nl","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Marine and Transport Technology","","Production Engineering and Logistics","",""
"uuid:4f3b5f65-eaca-476f-8013-13660bafb860","http://resolver.tudelft.nl/uuid:4f3b5f65-eaca-476f-8013-13660bafb860","Cosmetic glove stiffness compensation for body-powered hand prostheses: Design of a novel negative stiffness element","Bos, R.A.","Van der Helm, F.C.T. (mentor); Plettenburg, D.H. (mentor)","2013","The addition of a cosmetic glove to an upper limb prosthesis has an indispensable effect on the cosmetic value, but its viscoelastic behaviour adds a substantial amount of stiffness and hysteresis to the system. Consequently, the overall usability of the prosthesis is degraded. A novel negative stiffness element is designed to compensate for the cosmetic glove's stiffness. A combination of using linear helical springs and the concept of rolling link mechanisms has resulted in a Rolling Stiffness Compensation Mechanism (RSCM). Results show that the RSCM is capable of exerting a progressive negative stiffness characteristic and fits into a 33 mm diameter wrist. Consequently, an otherwise voluntary opening toddler-sized prosthesis is converted into a voluntary closing device, reducing maximum operation forces down to 40 N with a combined effiency of 52%. Further adjustments to the design are able to further improve the efficiency of the mechanism. Moreover, changes in geometric relations of the mechanism offers possibilities for a wide range of prostheses and other applications.","negative stiffness; upper limb prosthetics; rolling link mechanisms; cosmetic glove","en","master thesis","","","","","","","","2018-12-18","Mechanical, Maritime and Materials Engineering","BioMechanical Engineering","","BME","",""
"uuid:bbfabc0b-77a2-4bd9-8224-264d27a3b143","http://resolver.tudelft.nl/uuid:bbfabc0b-77a2-4bd9-8224-264d27a3b143","DelftVM","Bos, M.","Dulman, S.O. (mentor); Langendoen, K.G. (mentor)","2013","Final report about DelftVM.","virtual machine; delftvm; spatial computing","en","bachelor thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Distrubuted Systems","","","",""
"uuid:2d3daee4-855b-4ca5-b894-687fdc9d6d3d","http://resolver.tudelft.nl/uuid:2d3daee4-855b-4ca5-b894-687fdc9d6d3d","The Ideal Electric Bicycle for Commuters","Bos, G.A.","Flipsen, S.F.J. (mentor); Eris, O. (mentor)","2013","This thesis represents a graduation project that was done for the early stage startup: Spaac. The alternative title is: A Design Intervention to Stimulate E-Bike Acceptance. A bicycle was designed to appeal to young commuters that currently do not ride e-bikes because of the social stigma. The Cultural Strategy of Douglas Holt was used to come to a design brief and vision that is based on a problem of cultural rather then functional nature. This led to a reactionary approach to the current Dutch bicycle market. The e-bike system is shown rather then hidden but the e-bike interface itself is made more unobtrusive to create a more authentic cycling experience. To better resists an urban context, wiring and lights have been integrated in the frame. The ideal e-bike system was prototyped into a working model to evaluate reliability. The final design is worked out so that it can easily be modified in order to suit consumer demands.","electric; e-bike; pedelec; sustainability; cultural; culture; user; commuter; bicycle; strategy; Dutch; urban; startup; market; ideal; ideology","en","master thesis","","","","","","","Campus only","","Industrial Design Engineering","Design Engineering","","","",""
"uuid:90febd72-8f45-4519-b185-c744017d9f13","http://resolver.tudelft.nl/uuid:90febd72-8f45-4519-b185-c744017d9f13","Walking and Talking: Using persuasive game elements to increase physical activity","Bos, J.W.","Visch, V.T. (mentor); Mulder, I.J. (mentor); Prins, R.G. (mentor)","2013","Physical activity (PA) benefits a healthy condition. On the broader canvas public health benefits from promoting a healthy lifestyle, which includes sufficient PA. Apart from the lives that are improved, The financial merit of improved public health is substantial. Walking is deemed one of the most effective forms of PA. It is for this reason that interest in research on the topic of walking and PA has increased over the past years. A study is being conducted by Erasmus Medical Centre if and how new social and physical interventions in certain neighbourhoods in Rotterdam can induce an increase in the weekly amount of time that people aged 55+ spend on walking. Developing new interventions requires a creative process. Therefore the discipline of Industrial Design offers a valuable addition to the set-up of the study. Senior citizens and other people with a sedentary lifestyle, particularly in some of the neighbourhoods in Rotterdam with lower socioeconomic status, would benefit socially and physically from increasing the role of walking in their daily routine. However they lack sufficiently strong incentives and perceive barriers to go out on the street. A persuasive design, tailored to the context of the neighbourhoods and the motivation of the elderly is desired to influence the citizens aged 55+ to advance their walking behaviour. The assignment is to create an intervention in the physical environment which should - together with other physical interventions - induce an increase in time spend on walking with 30 minutes per week, which is roughly 20% of the average time older people (aged 65+) currently spend on walking. Inspired by a process of context mapping with an emphasis on personal stories, an iterative design approach was followed to develop an appropriate and functioning design to address this matter. The resulting intervention: ‘De Reizende Roos’ (the travelling rose) can best be typified as an effort to brand walking as a social tool - which ultimately helps people retain independence. The objective of the branding campaign is for people to be able to deploy this tool according to their needs. One widely recognised quality of walking is highlighted: Walking benefits a good conversation between two people. Creating awareness around this quality happens by means of a learning experience: Participants are immersed in an experience and subsequently guided to turn the experience into knowledge by reflection and abstraction. ""De Reizende Roos"" (the travelling rose) is a narrative which gives meaning to an assignment that leads to the aforementioned learning experience. The narrative is about improving ‘the’ neighbourhood by improving one’s perception of the neighbourhood, about taking initiative and plucking up courage. A box containing the assignment is passed on between participants. The rose is the character who explains the assignment. Hence the name: travelling rose. Essentially the assignment is a challenge to make a walk together and while doing so, starting another initiative to improve social relations in the neighbourhood. After performing this act the participants are asked to reflect on the process by filling out a guestbook. Part of the report is to share experiences about if and how walking supported a conversation. The goal of the guestbook is for the participants to put the experience into words and thus transform it into knowledge. Experiments have demonstrated that the pass-on system works in principle, however some limitations are found. The most important finding is that not every senior can cope with the uncertainty of receiving a mysterious box and assuming responsibility for it. Furthermore it is inevitable that the boxes stop progressing at some point. An organisation is required to ‘respawn’ the boxes in such cases. These and other issues are addressed in what is called the ‘final’ design. However, it should be mentioned that the reality that a design is never final, applies on this project. The first and most important steps to evaluate will be how the adjusted pass-on system functions and whether the reflection in the guestbook guides towards an actual learning experience. By creating a learning experience and offering a tool to retain independence, a socially relevant and durable contribution is made, that is, a contribution which exceeds the boundaries of the intervention study and has a long lasting effect in the lives of the target group.","persuasive design; persuasive gaming; social cohesion; physical activity; motivation; experiential learning; elderly; senior; walking; talking; product service system; intervention study; behaviour; iterative design; public health; context mapping","en","master thesis","","","","","","","Campus only","","Industrial Design Engineering","Industrial Design","","Master of Science Integrated Product Design","",""
"uuid:0d24f7e1-4979-4d75-9153-5ff2c326c912","http://resolver.tudelft.nl/uuid:0d24f7e1-4979-4d75-9153-5ff2c326c912","Conceptual System Design of a Solar Electric Propulsion Stage for Earth-Moon Cargo Transfer Missions","Bos, C.R.","Zandbergen, B.T.C. (mentor); Gamgami, F. (mentor); Gill, E.K.A. (mentor)","2013","There is a renewed interest, expressed by ISECG, to return to the Moon and establish a longer human presence on the lunar surface. Long term missions require supplies, which can be transported to the Moon by a new promising solution: the Solar Electric Propulsion (SEP) stage. The goal of this study is to create a conceptual system design (phase 0) of such a SEP stage for Earth-Moon cargo transfer missions. The design is driven by the propulsion and electric power system, which are the main focus of the study, although all other subsystems are also covered to obtain a holistic system design. Designing a SEP stage is a multi-disciplinary task, in which the trajectory analysis, propulsion system and electric power system are tightly coupled. A mission analysis program is created for simulation of the spiral transfer, while flexible design tools are developed to create the conceptual design. The tools provide the possibility to quickly evaluate a different mission scenario, such that the most suitable scenario, in consultation with the customer, can be selected. Aconceptual design is created that meets the mission objectives and requirements. During the design phase it was identified that the concept of a solar electric propulsion stage, accommodates some critical issues and technological challenges. Especially the high power demand, leads to the usage of highly conceptu l power conditioning techniques, which still have to be proven in space, possibly by a precursor mission. It was also found that the SEP stage, compared to a chemical rocket, is capable of transporting 32% more payload, while having the same initial mass. This number can even increase to 90% in case a different mission scenario, with a longer transfer duration, is selected.","","en","master thesis","","","","","","","","","Aerospace Engineering","Space Engineering","","","",""
"uuid:5a3585c4-7083-432d-88de-8c8dc9a3d948","http://resolver.tudelft.nl/uuid:5a3585c4-7083-432d-88de-8c8dc9a3d948","Self-starting of a small urban Darrieus rotor: Strategies to boost performance in low-Reynolds-number flows","Bos, R.","van Bussel, G.J.W. (mentor); Timmer, W.A. (mentor); Geurts, B.M. (mentor)","2012","Like many vertical-axis wind turbines (vawts) of the Darrieus type, Turby fails to achieve a fully passive start-up. Experiments indicate that there is a band of negative torque—often referred to as dead band in literature—somewhere in the tip speed range 0.5 B l B 1.6. The reason behind this is that, unfortunately, the power coefficient obtained at the rated wind speed is all but constant. The combination of low wind speeds and the small scale of the device leads to very low Reynolds numbers; well in the order of < 105. The lift production and stall behavior of the airfoils aggravates in these conditions, with low starting torque as a result. The design case revolved around Turby – a small 1.6 kW, 2.20 m diameter vawt with a projected cut-in wind speed of 3 m/s. The purpose of this master thesis is to investigate the cause of the poor start-up performance and to find possible solutions for the problem. This eventually led to a design proposal.","Windenergy","en","master thesis","","","","","","","","","Aerospace Engineering","Wind Energy","","Sustainable Energy Technology","",""
"uuid:22985a57-d7f8-444b-bab1-3f574547806b","http://resolver.tudelft.nl/uuid:22985a57-d7f8-444b-bab1-3f574547806b","AVR Reactor, verbrandingsoven wordt leerwerklandschap","Bos, A.H.","Nottrot, R. (mentor); Jennen, P. (mentor)","2012","Rotterdam Zuid kent vele problemen die zich concentreren in de oude wijken rondom de oude havens. Door enorme schooluitval en jeugdwerkloosheid ontstaat er de kans van een opgroeiende verloren generatie die geen aansluiting vindt met de arbeidsmarkt. Daarnaast is het voor bedrijven steeds lastiger om gekwalificeerd personeel te vinden. Als reactie op de on Nederlandse problemen is er een nationaal programma opgesteld dat advies heeft uitgebracht op onderwijs, economische versterking en fysieke kwaliteitsverbetering. Op de pijler onderwijs wordt gesteld dat doorlopende leerlijnen en ambacht in de wijken moet worden gestimuleerd. Ondertussen zijn er in Rotterdam veel praktijkgerichte opleidingen opgezet en bieden jongeren de mogelijkheid om werkend een opleiding te volgen. Toch bieden deze opleidingen vaak alleen stageplaatsen en zijn ze veelal aan de randen van de stad gelokaliseerd.De fabriek kan gedeeltelijk worden hergebruikt. De rookgasreiniger aan de voorzijde en de kraanbaan in het midden zijn elementen die ook het kenmerkende karakter van de fabriek aanduiden. Door vier nieuwe volumes toe te passen met hierin een programma van leerwerk opleidingen ontstaat er een voorpost voor opleidingen in de regio. Jongeren zulllen zelf het voorbeeld geven welke opleiding mogelijk is doordat de scholen zijn gekopppeld aan de kraanbaan. Deze kraanbaan is de nieuwe verbinding naar Katendrecht. De locatie ligt nu geisoleerd door de Pleinweg, door deze ondergronds te brengen en het park door te trekken naar de overzijde ontstaat een recreatie gebied waar in de toekomst bedrijven een dependance kunnen opzetten.","hergebruik; leerwerklandschap; fabriek","nl","master thesis","","","","","","","","2012-11-05","Architecture","Veldacademie, Explorelab","","Veldacademie Rotterdam","",""
"uuid:636dae9c-7644-48c4-90bd-74794c149b90","http://resolver.tudelft.nl/uuid:636dae9c-7644-48c4-90bd-74794c149b90","|RE|InfraStructured: Urban regeneration by integrating infrastructural residual space","Bos, M.K.J.","Westrik, J.A. (mentor); Stouten, P.L.M. (mentor)","2012","This thesis holds a study on infrastructural residual space, space that is residual to the development of big scale infrastructure. By a desire to place these infrastructure as efficient as possible, meaning the trough flow and the building cost/time, these are constructed (location and dimension) without any concern to its adjacent context. The regulations and the dimension of big scale infrastructure make the direct adjacent area difficult to be developing by urban planners and designers. As a result these spaces develop by private initiatives and are developed without the supervision of a spatial organisation or concept. By this an urban fabric formed that mainly is oriented on the car users and hold great obstacles for pedestrian and bicyclist (to gather, travel and hold activities). By this they function as a gap within the urban life of a city, lacking the vitality, connectivity and attractiveness to function as a proper part within the city. This thesis researches the area residual to the A20 and the railroads between Rotterdam central, Schiedam central and Rotterdam Alexander. The area is located between the social-economic weak neighbourhoods of Spangen, Oud Mathenesse, Overschie and Nieuwe Westen. By their location adjacent to infrastructure these hold an autonomous structures, making these isolated island within the city. Within the research six spatial criteria for vitality, attractiveness and connectivity are implemented to show the spatial frailties causing the gap in urban life. This thesis provides spatial strategies and urban design interventions that can integrate this area within its urban fabric, aiming to provide social or economic benefits for the residents within the adjacent neighbourhoods, Urban Regeneration.","A20; Infrastructural residual space; Rotterdam; Urban Regeneration; Integration; Infrastructure; Lost space","en","master thesis","","","","","","","","2012-10-11","Architecture","Urbanism","","Urban Regeneration","",""
"uuid:d1e60e4d-70f0-4734-866b-19d8ad23ef06","http://resolver.tudelft.nl/uuid:d1e60e4d-70f0-4734-866b-19d8ad23ef06","TALL - Design for the Schiekadeblok","Bos, J.M.","Bollen, R. (mentor); Bergsma, A. (mentor)","2011","TALL - Design for the Schiekadeblok","TALL; Highrise; Rotterdam; Weena; Rottterdam Central District","nl","master thesis","","","","","","","","2011-11-15","Architecture","Materialisation","","TALL","",""
"uuid:649bb3b0-7204-44e4-b4d9-e22816fe4f2e","http://resolver.tudelft.nl/uuid:649bb3b0-7204-44e4-b4d9-e22816fe4f2e","The morphological effects of sediment diversions the Lower Mississippi River","Bos, M.F.M.","De Vriend, H.J. (mentor); Sloff, C.J. (mentor); Mosselman, E. (mentor); Van Ledden, M. (mentor); Blom, A. (mentor); Georgiou, I.Y. (mentor)","2011","The wetlands in the Mississippi delta (USA) are drastically subsiding and eroding. Many projects and researches are ongoing to determine how this “drowning effect” of the delta can be stopped. One of the solutions that could be feasible is implementing sediment diversions in the levees of the Lower Mississippi River in order to divert sediment into the delta. This thesis addresses the morphological effects of river diversions on the Lower Mississippi River. The main objective is to analyze and optimize trade-offs between delta building and river navigability. For this purpose a 2DH numerical model with Delf3D has been created; the model simulates the hydro- and morphodynamic behavior. The river reach which has been studied is the final 110 km of the river from Point a la Hache at River Kilometer 78 (RK 78) down to the mouth of the river (RK -30), below Head of Passes. The hydrodynamic model has been calibrated and verified with flow and stage data from daily observations on the river. With the available sediment data a calibration has been carried out of the morphological behavior in the river. The model has been used to simulate several scenarios to get insight in the problems in the delta. From analysis of the model results the river bed in the study area can be divided into three categories. Upstream of RK 4 the bed is subject to erosion, around RK 4 the bed is practically in equilibrium and downstream of RK 4 the bed is subject to sedimentation. The reach downstream of RK 4 is the dredging reach; after analyzing the long-term simulation of 20 years it is not expected that the dredging quantities will decrease in the future. Closing off West Bay diversion has a positive effect on the dredging quantities. The best diversion site for this study area is found in the inner bend of the river upstream of Empire (RK 47) at RK 53. This site is most efficient and diverts the largest quantities of sand through the diversion.","Lower Mississippi River; Sediment diversions; Delft3D; hydrodynamic and morphodynamic modeling; maintenance dredging","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:8f222f58-eddb-4024-9aab-9ef99745b499","http://resolver.tudelft.nl/uuid:8f222f58-eddb-4024-9aab-9ef99745b499","Traffic induced bearing loads and movements of a steel plate-girder bridge.","Bos, V.","Bijlaard, F.S.K. (mentor); Kolstein, M.H. (mentor); Van der Veen, C. (mentor); Leendertz, J.S. (mentor); Freundt, U. (mentor); Houben, L.J.M. (mentor)","2011","Structural bearings in bridges are subjected to loads and movements, causing wear of bearing components as PTFE-sheets, guides and internal seals. Nowadays, these components are tested for durability according to EN 1337. The parameters and procedures in these tests are questioned and, therefore, investigated in an existing plate-girder bridge in the Netherlands. This thesis provides the results and is part of a larger research in which, among other things, other bridges are studied.","Bearing; Wear; Plate-girder bridge","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Design and Construction","","","",""
"uuid:b4019f6f-35ab-4db8-a65b-14493d26d448","http://resolver.tudelft.nl/uuid:b4019f6f-35ab-4db8-a65b-14493d26d448","Formation Flying","Bos, D.A.; Dijkers, H.P.A.; Gutleb, T.L.M.; Herinckx, L.E.; Van Nunen, R.; Radfar, H.; Van Rompuy, E.; Sahin, S.E.; De Wit, J.","Beelaerts van Blokland, W.W.A. (mentor); Roling, P. (mentor); Giorgi, G. (mentor); Verhgen, W.J.C. (mentor)","2011","A first outline for the concept of formation flying is investigated. The objective is to create a sustainable air transportation system for the next generation of aircraft from a formation flying perspective. When flying in formation over long distances the trailing aircraft can benefit from the wake vortices created by the preceding aircraft. Aircraft flying in formation can reduce their fuel consumption substantially by benefitting from wake vortices. Consequently, the emission of carbon dioxide is significantly reduced. The four main areas of investigation are aerodynamics, air traffic operations, aircraft design and navigation. Additionally, the technical design development and requirements are described.","Formation; Innovative; future; fuel reduction","en","bachelor thesis","","","","","","","","","Aerospace Engineering","Air Transport & Operations","","","",""
"uuid:14c5cb91-5ba7-4171-91a2-0cbf816ab8e2","http://resolver.tudelft.nl/uuid:14c5cb91-5ba7-4171-91a2-0cbf816ab8e2","Feasibility study of the WindNok: a wind turbine integrated in the roof of a farm building","Bos, J.E.","van Bussel, G.J.W. (mentor); Timmer, N. (mentor)","2010","","Windenergy","en","master thesis","","","","","","","","","Aerospace Engineering","Wind Energy","","Sustainable Energy Technology","",""
"uuid:e323b19d-29a6-4831-a4c6-1b45bd66f2ef","http://resolver.tudelft.nl/uuid:e323b19d-29a6-4831-a4c6-1b45bd66f2ef","Paper choice - the starting point for sustainable printing: Design of an Eco Paper Wizard for Dutch printshops","Bos, J.M.","Buijs, J.A. (mentor); Wever, R. (mentor)","2010","This graduation thesis, written at Oce, analyses the main problems in the Dutch printshop sector for more sustainable printing. A new indicator is discussed, that compares environmental impact of papers. Secondly an Eco Paper Wizard has been designed and tested. The designed Eco Paper Wizard has a unique interaction design and tests have shown that it is possible to seduce end-users to choose more sustainable paper. The presented combination of the Indicator & Wizard enables Océ to discover new eco services, to position itself as green company and results in innovative ways of earning money with sustainable printing.","paper; sustainability; wizard; oce; eco; printing","en","master thesis","","","","","","","Campus only","2011-03-26","Industrial Design Engineering","Design for Sustainability","","Master of Science Integrated Product Design","",""
"uuid:55c7d406-5699-4e7a-b1fe-8448b461d18d","http://resolver.tudelft.nl/uuid:55c7d406-5699-4e7a-b1fe-8448b461d18d","The Effect of Task on Visual Attention and its Application to Image Quality Assessment Metrics","Bos, L.W.","Heynderickx, I. (mentor); Alers, H. (mentor)","2010","Determining the perceived quality of a digital image can be done by showing it to a large group of people and ask them to rate its quality. However, this method is too cumbersome and time-consuming for most applications. Therefore, automatic metrics have been developed, which are able to objectively predict the perceived image quality without the need for any human input. Such image quality assessment metrics average the predicted quality across a whole image into a single quality value. To improve their performance, their predicted image quality is weighted with visual attention information: regions in the image that receive more attention are weighted more heavily in the quality assessment. Furthermore, the effect of a quality assessment task on visual attention is investigated via a large scale subjective experiment. The main findings are that 1) people who are looking freely pay more attention to the region of interest than people who are scoring the image quality, 2) applying the visual attention of people who are looking freely to image quality assessment metrics yields a higher performance gain than the visual attention of people who are scoring the image quality, and 3) the predicted image quality in the region of interest has a more positive influence on the overall predicted image quality than the quality in the background. In short, visual attention information can be used to increase the performance of image quality assessment metrics.","visual attention; image quality assessment; task; saliency; region of interest","en","master thesis","","","","","","","","","Electrical Engineering, Mathematics and Computer Science","Man-Machine Interaction","","","",""
"uuid:4dfcd2a2-deed-4ea6-a5c2-47486cd9c5c9","http://resolver.tudelft.nl/uuid:4dfcd2a2-deed-4ea6-a5c2-47486cd9c5c9","Fieldwork coastal engineering: Preliminary design of a floating marina, Varna, Bulgaria","Moerman, E.; Drieman, R.; Mous, B.; Li, L.; Kluwen, J.; Van der Linde, P.; Ritsema, A.; Lioutas, A.; Monden, M.; Tsimopoulou, V.; Jumelet, D.; Bos, M.; Van der Zee, R.; Hoss, F.; Ros, R.","","2009","The beach in front of the hotel Sirius is suffering from a retreating coastline. Bathymetry and beach profiles were measured. With the data from previous years the long term evolution of the coast was analyzed. The main conclusions were that the beach in front of the Sirius hotel is still suffering from erosion and if this erosion trend continues it will damage the hotel itself in just a few years. More to the south the beach was actually a little bit accreting. The reason why only the beach in front of the hotel is eroding is probably because the beach there is at the leeside of the breakwater, which causes a gradient in the longshore sediment transport The hotel owner of Azalia, located at the Azalia beach north of Sirius beach, observed a retreating coastline during some months in the year. Therefore also here the bathymetry and beach profiles were measured. Unfortunately there were no previous measurements to compare the data with. From the beach profile we can conclude that there is probably a seasonal variation in the coastline. During winter the coastline is retreating due to the more severe wave climate. Yet in summer the beach is accreting. It can be possible that sometimes the beach has not accreted enough at the moment the touristic season starts. This can be a problem for the hotel owner because the beach is not wide enough then. A solution then can be found by some minor dredging operations in the form of beach nourishments. The sand can be recovered from deeper water or from shoals at the same beach. It can be assumed that the nourishment is not necessary at the moment but might be a good idea in the next years. Furthermore the owner of hotel Azalia wants to build a new marina a few kilometers to the south of St Constantine. Due to difficulties in obtaining a building permit it will be a floating marina which can be removed in winter, which must be protected by a breakwater. By a Multi Criteria Analysis a floating breakwater that will be removed during winter proved to be the best solution in this case. This breakwater can be designed with the milder wave conditions during summer which is a serious advantage.","Fieldwork; Varna; Bulgaria; Floating Breakwater","en","student report","TU Delft, Department Hydraulic Engineering","","","","","","Campus only","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:296a03c7-d6bd-4ac8-8a37-6d3879ccd96d","http://resolver.tudelft.nl/uuid:296a03c7-d6bd-4ac8-8a37-6d3879ccd96d","Inventarisatie van mogelijke verbeteringen voor Lijstrisico's bij PPS-projecten van Rijkswaterstaat","Bos, B.B.","Ten Heuvelhof, E.F. (mentor); Koppenjan, J.F.M. (mentor); Correljé, A.F. (mentor); Boendermaker, C. (mentor); Rijkswaterstaat (contributor)","2009","","","","master thesis","","","","","","","","","Technology, Policy and Management","","","","",""
"uuid:91fa003a-8ddc-4824-a612-5ece7094d6a7","http://resolver.tudelft.nl/uuid:91fa003a-8ddc-4824-a612-5ece7094d6a7","Cité Noord Amsterdam","Bos, E.","Zeinstra, J. (mentor); Pimlott, M. (mentor); Van der Zaag, E. (mentor)","2008","","","en","master thesis","TU Delft, Architecture, Interiors, Buildings and Cities","","","","","","","","Architecture","","","","",""
"uuid:6fef6b25-58c2-42d4-8271-b00b5ddb00b4","http://resolver.tudelft.nl/uuid:6fef6b25-58c2-42d4-8271-b00b5ddb00b4","Connection of large-scale wind power generation to the Dutch electrical power system and its impact on dynamic behaviour","Bos, J.A.","Kling, W.L. (mentor); Hendriks, R.L. (mentor); Kamp, L.M. (mentor); Paap, G.C. (mentor); Spaan, F.J.C.M. (mentor)","2008","Installed wind power world wide is increasing rapidly. The increase in wind power in the European electricity grid is expected to have its impact on the system behaviour. A European study, European Wind Integration Study (EWIS), was thus set up to study the impact of wind power. This thesis was carried out in parallel with EWIS and overlaps at some points. The impact of large scale wind power integration on transient stability in the Dutch grid was studied. For the simulations the Dutch part of the UCTE interconnected system load flow model was used. Speed controls and excitation controls were added to the thermal power plants, and at the interconnections equivalent generators were placed to represent the external grids. Nine connection points were defined and all installed wind power was aggregated in wind parks at those nine connection points. The distribution of wind power amongst turbine type and location was determined to get a realistic distribution. Several simulation cases were then taken into account, first a comparison was made between the dynamic grid behaviour of the year 2008 and the year 2015, when no changes in the current regulations regarding fault-ride-through capabilities are made, i.e. all wind power will be disconnected from the grid on a voltage drop below 0.8 p.u.. Secondly a comparison of the dynamic grid behaviour of 2008 and the year 2015 was made, with no wind included in this case. As a third case, different connection requirements were applied, so the wind turbines had to stay connected to the grid in case of a fault. These `new' regulations were applied to the 2015 grid situation. From the calculations it followed that the 2015 grid without wind power installed shows a less stable behaviour than the 2008 grid. In the 2008 situation a short circuit in the centre of the grid may cause the disconnection of up to 1258 MW of wind power. For the 2015 situation this can become over 5000 MW. A disconnection of such a large amount of wind power is leading to voltage oscillations and oscillations at interconnection power flows. These oscillations however damp out fast and do not increase in amplitude. The voltage recovery time increases enormously between these years. Applying new regulations, where all variable speed wind turbines will have to stay connected to the grid during a short circuit, reduces the oscillations. As can be concluded from the calculations, a rather stable grid situation is created. This is mainly caused by the fact that the external grids are not taken into account, but modelled as an equivalent. When a larger part of the surrounding UCTE grid will be implemented the results will be different and most probably show a less stable behaviour. This thesis also looked into the large differences in wind power penetration in Europe. Several countries have a leading position in installed wind power, whilst a country like the Netherlands stays behind. Governments in Germany and Spain are very supportive and show a stable position towards renewable energy. Furthermore social acceptance is high in Germany and Spain, and both have a large local wind turbine production. These are important explaining factors for the differences in local selection environment and increase in installed wind power.","stability; dynamics; wind power; power system","en","master thesis","TU Delft, Electrical Engineering, Mathematics and Computer Science, Electrical Power Systems","","","","","","","","Electrical Engineering, Mathematics and Computer Science","","","","",""
"uuid:6e6c25ab-bf42-463d-aed4-80226cea03b8","http://resolver.tudelft.nl/uuid:6e6c25ab-bf42-463d-aed4-80226cea03b8","Wave characteristics derived from video","Bos, C.","Stive, M.J.F. (mentor); Roelvink, J.A. (mentor); Reniers, A.J.H.M. (mentor); Aarninkhof, S.G.J. (mentor); Cohen, A.B. (mentor); Smit, M.W.J. (mentor)","2006","Collection of long-term data sets of wave characteristics and bathymetry with high resolution in time is a prerequisite to improve our understanding of nearshore coastal dynamics. Advanced video monitoring systems allow to sample these data automatically, on a long-term basis and without the need to deploy in situ instruments in a hostile environment. Recently, a technique was developed to derive wave frequency-direction spectra from time series of pixel intensities (Holman and Chickadel, 2004). A second technique (Stockdon and Holman, 2000) quantifies nearshore bathymetry from videoderived estimates of wave phase speed. Both techniques were successfully tested against field data collected at Duck (NC) and near San Diego (CA); their applicability for typical North Sea conditions as found along the Dutch coast is unknown yet. The central aim of this work is to apply and assess the applicability of the existing methods to estimate wave characteristics from video imagery with data from the Dutch coast. To achieve this central aim, the Holman and Chickadel (2004) model is used to determine directional wave spectra at Egmond aan Zee (NL) and the accuracy of the results is assessed. Furthermore a new analysis technique is developed to determine wave phase speed and corresponding bathymetry from video using cross correlation analysis, as opposed to the spectral technique developed by Stockdon and Holman (2000). The work described here is part of the ONR funded BeachWizard project (Cohen et al, 2006), which aims at the nowcasting of bathymetrical evolution through assimilation of remote sensing data and model computations of nearshore coastal processes. The analysis of wave direction, period and celerity from time stack images was performed with data collected at Egmond aan Zee along the Dutch coast. The field experiment was carried out from 20 September 2005 to 29 October 2005 in cooperation with the Utrecht University. During this field campaign data were simultaneously collected by video (half hourly time stack images) and in situ wave instruments in the intertidal zone. During the field campaign mostly mild wave conditions occurred and a complex, highly irregular beach morphology was noticed. The final dataset consists of 2.5 days of good quality time stacks at half hourly intervals and concurrent in situ measurements (water level, wave height, period and direction) at three locations, resulting in 43 time-series for ground-truthing. Wave data sampled from an offshore buoy at 21 m water depth are used for ground-truthing the deeper optical instruments (outside the intertidal area).","wave; video; long-term dataset; wave period","en","master thesis","TU Delft, Faculty of Civil Engineering and Geosciences, Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:cf5bb288-e9cc-4e2c-aa22-bfc067a631d3","http://resolver.tudelft.nl/uuid:cf5bb288-e9cc-4e2c-aa22-bfc067a631d3","Fieldwork Coastal Engineering: Varna (Bulgaria)","Bos, C.; Burgers, J.J.; Van Dijk, M.; Heeringa, E.; Van den Hengel, D.; Lausman, R.; Oortman, N.; Poot, R.; Segboer, T.; De Sonneville, B.","","2004","Research has been carried out in St. Konstantin, Varna, Bulgaria. In the second chapter of this report an Analysis of the Tetra pods on breakwater of the “Sunny Day Marina is presented, where the damage is determined and different approaches are used and compared to determine the significant wave height. In the third chapter the beach measurements are described. An analysis of the development of the beach line and the beach profiles is compared with other years and a sieve analysis is carried out. Chapter four describes wave measurements for the area; these are made visually and with a pressure gauge. In chapter five, the contours of a groin in the area is measured and compared with data from other years.Chapters six contains information about the stones measurements in the quarries we visited. In chapter seven the bottom of the sea is mapped by using the echo sounding data. In chapter eight, the sediment characteristics are determined. At the village of St-Constantin a group of investigators wants to make an artificial island in the sea, requirements are presented in chapter eight. The final chapter nine relates about another project, the expansion of hotel White lagoon.","fieldwork; Varna; Bulgaria; CT5318","en","student report","TU Delft, Department Hydraulic Engineering","","","","","","Campus only","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:bda59ce1-7f03-4258-b660-88e713727872","http://resolver.tudelft.nl/uuid:bda59ce1-7f03-4258-b660-88e713727872","Atomistic simulation of interface dynamics during austenite-ferrite transformation","Bos, C.","Thijsse, B.J. (mentor); Sietsma, J. (mentor)","2002","","","en","master thesis","","","","","","","","","Mechanical, Maritime and Materials Engineering","Materials Science and Engineering","","","",""
"uuid:5f2b6de2-7057-4baa-b73b-4a9fc694d61e","http://resolver.tudelft.nl/uuid:5f2b6de2-7057-4baa-b73b-4a9fc694d61e","Integraal Plan voor de kust van Katwijk: Ontwikkeling van Veiligheid en Recreatie","Van den Broek, M.; Van der Giessen, M.; Ginsel, D.; Kooy, M.; Van der Mark, R.; De Nooijer, J.; Prinsen, A.; Van de Rest, P.; Albers, V.J.J.; Arends, A.; Bos, R.; Ouwehand, J.; Reeskamp, B.; Stive, M.J.F.; Waterman, R.E.; Zitman, T.J.","","2002","In Katwijk zijn er verschillende partijen die plannen hebben met betrekking tot de kust. Veiligheidsverhoging van een deel van Katwijk dat nog niet op deltaniveau is, een vergrootte uitwateringsvoorziening, de geprojecteerde nieuwe zeejachthaven en ontsluiting van het scheepvaartverkeer vanaf zee zijn hierbij de kernwoorden. De projectgroep heeft zichzelf als doel gesteld een integraal plan te ontwikkelen voor het kustgebied van Katwijk met het oog op bovengenoemde aspecten. Daarnaast wordt aandacht besteed aan mogelijke natuurontwikkeling, duinontwikkeling, zoetwaterbeheer en de uitbreiding van de kuststrook in westelijke richting. Aspecten zoals invloed van de plannen op de kustmorfologie wordt erg belangrijk geacht. Er is voor gekozen een methode te kiezen waarbij de nadruk ligt op de inventiviteit van de groep, om tot een groot scala ideeën te komen. Er zijn onder andere brainstormsessies gehouden, waarbij zo min mogelijk oplossingen op voorhand zijn uitgesloten. Als kader is echter wel gelet op de wetgeving omtrent planontwikkeling en de functie van de kust als bescherming van Nederland. Er is naar een overzicht van de alternatieven toegewerkt, waarmee de politiek een onderbouwde keuze kan maken voor de inrichting van het gebied. Er is voor gekozen een lijst op te stellen van alle mogelijke functies van en criteria voor het kustgebied van Katwijk om een goede beoordelingsmethode te vormen. Nadat deze zijn gekoppeld aan de belangen van de betrokken partijen, is er aan de hand van een selecte lijst met functies en criteria een vragenlijst opgesteld, waarop de alternatieven uiteindelijk beoordeeld worden. Voor de twaalf alternatieven is eerst de score per criterium bepaald. Dit is gebeurd door middel van het geven van waarden van 1 tot en met 5, waarbij 1 het beste is en 5 het minst beste. Zo zijn de alternatieven ten opzichte van elkaar geschaald. De alternatieven zijn beoordeeld op criteria zoals morfologie, veiligheid en natuurwaarde. Het resultaat van de studie is een multicriteria scoretabel waarin elk alternatief beoordeeld is op 13 criteria. Op basis van deze tabel en de rest van het onderzoeksresultaat kan wel worden gebruikt om een keuze voor één of enkele alternatieven te maken, met de betrokken partijen, welke, na bereiken van consensus, verder kan worden onderzocht en uitgewerkt.","Katwijk; planontwikkeling; kustontwikkeling; kustlijnbescherming; recreatie","en","student report","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","","52.209330, 4.394717"
"uuid:c665f215-a8ee-4f5c-9f15-60d0c33e9a34","http://resolver.tudelft.nl/uuid:c665f215-a8ee-4f5c-9f15-60d0c33e9a34","Loosdrecht door het lint","Bos, J.A.","Van der Pol, A. (mentor); Tummers, L.J.M. (mentor); Verbeek, R.R.F. (mentor); Arends-Smit, W.G. (mentor)","2002","","Loosdrecht; stedenbouw","nl","master thesis","","","","","","","","","Architecture","","","","",""
"uuid:e6a76165-049f-4d74-8dcd-0baa4b17d1b4","http://resolver.tudelft.nl/uuid:e6a76165-049f-4d74-8dcd-0baa4b17d1b4","Uitwisselingsprocessen tussen hoofdgeul en uiterwaard van een rivier: Een experimentele studie","Bos, M.","De Vriend, H.J. (mentor); Booij, N. (mentor); Havinga, H. (mentor)","2000","In dit afstudeerproject wordt met behulp van een fysisch model onderzoek gedaan naar de uitwisselingsprocessen die bij hoogwater optreden tussen uiterwaard en hoofdgeul van een rivier. Dit afstudeerproject geeft daarmee een vervolg aan het door Van Prooijen [19] opgezette onderzoek naar grootschalige horizontale wervels in ondiepe menglaagstroming. Het fysisch model, waarin ook Van Prooijen zijn experimenten heeft uitgevoerd, is een samengesteld kanaal bestaande uit een hoofdgeul en een uiterwaard met een vaste bodem. In deze studie ligt het accent op het onderzoek naar de uitwisseling (van impuls, massa en sediment) door grootschalige horizontale wervels. Daarbij worden de invloeden van geometrische veranderingen op de wervels zoals het aanbrengen van zomerkaden en kribben en variatie in waterstand onderzocht. Het experimentele onderzoek is onder te verdelen in drie fasen: In fase 1 worden de drie opstellingen van Van Prooijen (rechte stroming (1), stroming met dwarscomponent naar de uiterwaard (2) en stroming met dwarscomponent naar de hoofdgeul (3)) herhaald met een wijziging in de geometrie (die ook voor fase 2 en 3 geldt): de verticale stap als overgang tussen hoofdgeul en uiterwaard wordt vervangen door een overgangstalud met helling 1:2. Daamaast wordt in de rechte opstelling een experiment met een verlaagde waterstand gedaan (la). Het meet- en analyseprogramma in Van Prooijen [19] wordt voor een groot deel toegepast. Dit maakt het mogelijk de resultaten van de verschillende opstellingen met elkaar te vergelijken. Dit gebeurt aan de hand van de ontwikkeling van de menglaag en de eigenschappen van de daarin voorkomende horizontale wervels zoals afmetingen, ligging en intensiteit. Daarnaast vindt op een kwalitatieve wijze onderlinge vergelijking van de zes opstellingen plaats wat betreft de mate van uitwisseling en sedimentatie in de uiterwaard. Het onderzoek spitst zich in deze en de volgende fase meer toe op praktijksituaties. In twee opstellingen (4 en 5) wordt de invloed van zomerkades in de uiterwaard op de uitwisseling door grootschalige wervels onderzocht. Het effect van de ligging van de zomerkade t.o.v. de overgang op de wervels krijgt hierbij aandacht. Onderlinge vergelijking van de opstellingen 1, 4 en 5 wat betreft de mate van uitwisseling en sedimentatie wordt uitgevoerd. In fase 3 worden kribben in de hoofdgeul (zonder zomerkaden) aangebracht. De totale waterbeweging, waarvan de grootschalige wervels een onderdeel zijn, wordt onderzocht en beschreven in Bos& avinga [5]. Dit afstudeerrapport bevat slechts het gedeelte dat betrekking heeft op de grootschalige horizontale wervels en de gevolgen voor uitwisseling en sedimentatie in de uiterwaard. Uit de resultaten van de experimenten in fase 1, 2 en 3 wordt inzicht verkregen in de effecten van de in het kader van 'Ruimte voor de rivier' voorgestelde maatregelen - zoals het verwijderen van zomerkaden en kribverlaging - op waterbeweging en morfologie. De meetresultaten worden verder verwerkt in numeriek onderzoek. De nodige aanpassingen betreffende het simuleren van de turbulente beweging in computermodellen kunnen met behulp van deze meetresultaten in een proces van validatie en calibratie gedaan worden.","flood plain; river morphology; turbulence","nl","master thesis","TU Delft, Civil Engineering and Geosciences, Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:57369598-9309-4685-aebf-9f759d857710","http://resolver.tudelft.nl/uuid:57369598-9309-4685-aebf-9f759d857710","Experimenteel onderzoek naar waterbeweging in een rivier met kribvak en uiterwaard","Bos, R.M.; Havinga, F.J.","Uijttewaal, W. (mentor); Booij, R. (mentor)","2000","Bij overstroomde kribben in een rivier met uiterwaard zijn grootschalige horizontale wervels te verwachten. Het tijdsgemiddelde langssnelheidsprofiel in dwarsrichting is bepalend voor het ontstaan van grootschalige wervels. In het kribvak vindt een grote richtingsvariatie in ruimte en tijd plaats. Deze variatie zorgt voor een grote uitwisseling van impuls, wat in de praktijk kan leiden tot uitwisseling van stoffen en fijn sediment. Benedenstrooms van de krib is een verticale neer aanwezig. In het kribvak is geen horizontale neervorming geconstateerd. Wel zijn de snelheden daar zeer laag. Achterloopsheid is te verklaren door een slingering van de kroming om de wortel van de krib heen. Bij relatief lage snelheden in de uiterwaard zijn de wervels vanuit de hoofdgeul dominant en zorgen die ervoor dat er een sterke stroming vanuit de hoofdgeul op de wortel van de krib gericht staat. De turbulente intensiteit op de dwarsraai midden in het kribvak heeft een lokaal en een absoluut maximum op de buigpunten van het horizontale snelheidsprofiel. De locatie van de maxima komt overeen met de theorie betreffende Kelvin-Helmholtz instabiliteiten. De grootte van de maxima kan echter niet gerelateerd worden aan de grootte van de gradiënt van de langssnelheid; de grootste fluctuaties vinden plaats op de overgang, daar waar de gradiënt significant kleiner is dan in de hoofdgeul. De kribben forceren in de hoofdgeul een grote gradiënt van de langssnelheid. Hierdoor worden horizontale wervels gevormd. Door de grote weerstand van de benedenstrooms kribben, vindt advectie plaats van de wervels naar de uiterwaard, wat grote snelheidsfluctuaties op de overgang tot gevolg heeft. Zo ontstaat er een grote impulsoverdracht van de hoofdgeul naar kribvak en uiterwaard.","river morphology; kribvakken; river groynes; flood plain; uiterwaard","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:7f9c1c13-2bdd-4429-8f29-27fb4c31133a","http://resolver.tudelft.nl/uuid:7f9c1c13-2bdd-4429-8f29-27fb4c31133a","IJvlakte: Een haalbaarheidsstudie naar kustuitbreiding bij IJmuiden","Bos, J.W.","Ligteringen, H. (mentor); Groenveld, R. (mentor); Hermans, M.A. (mentor); De Boer, G. (mentor); Bouwdienst Rijkswaterstaat (contributor)","2000","Het Noordzeekanaalgebied (NZKG) is een regio die een aantal zeer diverse economische functies in zich verenigd heeft (Luchthaven Schiphol, bedrijvenconcentratie Teleport, financiele centrum Amsterdam, havengebied, brede arbeidsmarkt). Juist deze combinatie van functies zorgt ervoor dat de regio goede kansen heeft zich verder te ontwikkelen. Dat is de mening van een aantal gerenommeerde onderzoeksinstanties en -bureaus. In dit onderzoek wordt specifiek het havengebied in de regio beschouwd. Aan groei in deze sector wordt een aantal voorwaarden gesteld waaraan moet worden voldaan, voordat deze kan inzetten. Forse investeringen in bedrijfsterreinen en infrastructuur Oplossen van de problematiek rond de nautische toegang tot het havengebied Opzetten van een overkoepelende organisatie voor het beheer van het gehele havengebied (Amsterdam, Zaanstad, Beverwijk en IJmuiden Velsen). Het opzetten van de beheersorganisatie wordt als eerste vereiste gezien. Alleen dan wordt het mogelijk geacht het lange termijn beleid op de juiste schaal uit te zetten en hierbinnen de juiste keuzes te maken. Voor de toekomst van het havengebied van het NZKG worden echter ook de volgende beperkende factoren onderscheiden: Een tekort aan bedrijfsterreinen in de gehele regio; een vergroting van de weerstand van het sluizencomplex bij IJmuiden; De problematiek rond het sluizencomplex is te onderscheiden in drie deelproblemen: Capaciteitsprobleem; Kwetsbaarheid van een haven achter slechts een grote zeesluis (Noordersluis); Beperking van maximale scheepsafmetingen. Dit onderzoek richt zich, als aanvulling op project 'Zeepoort IJmond' van de Rijkswaterstaat, op het onderzoeken van de haalbaarheid van aanleg van een kustlocatie bij IJmuiden. Achtergrond van de aanleg van deze kustlocatie is het oplossen van bovenstaande problematiek. De problematiek rond het sluizencomplex heeft de meeste invloed op de bulksector. Daar binnen deze sector doorgaans met zeer grote schepen gevaren wordt, zijn de beperkingen in scheepsafmetingen hier het eerste voelbaar. De containeroverslag is een sector die in principe onder de (door capaciteitsgebrek optredende) wachttijden voor het sluizencomplex zou lijden. Momenteel is echter de containeroverslag nog niet sterk ontwikkeld in de regio. Omdat de containeroverslag de groeimarkt bij uitstek is, is deze in het onderzoek toch meegenomen. Uitgegaan is een kustlocatie voor bulkoverslag en een kustlocatie voor zowel bulk- als containeroverslag.","coastal management; navigation locks; port development","nl","master thesis","TU Delft, Civil Engineering and Geosciences, Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:6b12f06b-ad3e-4b23-a438-eb288e75aca7","http://resolver.tudelft.nl/uuid:6b12f06b-ad3e-4b23-a438-eb288e75aca7","Havenontwerp systeem Hades","Bos, G.P.","Groenveld, R. (mentor); Booij, N. (mentor); Toms, G. (mentor); Ligteringen, H. (mentor)","1998","Om tot een structuur voor HADES te komen is er eerst een studie gedaan naar de variabelen waar bij het ontwerp van de natte infrastructuur rekening mee moet worden gehouden. De verschillende variabelen zijn in veel gevallen afhankelijk van elkaar. De dimensies van een variabele kunnen dan niet bepaald worden, wanneer de dimensies van een andere variabele niet bekend zijn. Het ontwerpproces zal binnen HADES op twee manieren verbeterd worden. Ten eerste wordt getracht het eerste ontwerp te verbeteren, zodat er in deze ontwerpfase minder iteraties plaats hoeven te hebben. Ten tweede worden de controleberekeningen nauwkeuriger uitgevoerd, zodat in vervolgfasen het aantal iteraties beperkt kan blijven. Het eerste ontwerp zal verbeterd worden door het ontwerp stap voor stap volgens een vast stramien in het systeem in te voeren. Met het overzicht van de afhankelijkheden is hiervoor een optimale volgorde bedacht, waarbij er geen variabele afhankelijk is van een later te bepalen variabele. Het stappenplan bij het gebruik van HADES is nu de volgende: Er wordt begonnen met het invoeren van de randvoorwaarden, de eisen en de criteria. Hiema wordt een eerder bedacht oplossingsprincipe stap voor stap in het systeem ingevoerd. Hierbij wordt gebruik gemaakt van vuistregels die in het HADES-systeem zijn opgenomen. Direct aansluitend wordt gecontroleerd of alle afhankelijkheden daadwerkelijk in het ontwerp zijn opgenomen. Hiema komt de gebruiker op een centrale plaats binnen het HADES-systeem van waaruit hij de verschillende nieuw te ontwikkelen controletools op kan starten. Na het controleren van het ontwerp op een bepaald aspect (kosten, golfindringing, sedimenttransport, nautiek, capaciteit, diepte) wordt teruggekoppeld naar de centrale plaats.","Port development; Port planning; Harbour oscillations","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:d6ca6799-0f26-45d3-97d7-db1eab27d083","http://resolver.tudelft.nl/uuid:d6ca6799-0f26-45d3-97d7-db1eab27d083","Slibafzetting op een steenslagbed als fundering voor een afgezonken tunnel","Bos, G.","Oostveen, J.P. (mentor); Van Roode, F.C. (mentor); Van Raalte, G.H. (mentor); Van Tol, A.F. (mentor); D' Angremond, K. (mentor)","1997","","siltation; bed protection; submerged tunnels; Oresund","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:9d89bb92-c8ae-4a5d-a274-73149aeae994","http://resolver.tudelft.nl/uuid:9d89bb92-c8ae-4a5d-a274-73149aeae994","Thermodynamic analysis of a chemical reacting system","Bos, K.N.","van Lieshout, G.P. (mentor); de Loos, W. (mentor); de Swaan Arons, J. (mentor)","1996","In this master project, a batch chemical reactor is compared with a continuous tank reactor at different process conditions in terms of exergy and exergy loss. The main objective of this project is to make a thermodynamic analysis of the reactive system lactic acid+water+ethanol as it is considered to be a closed system (batch reactor) and open system (continuous reactor). The project was divided into three parts…","","en","master thesis","","","","","","","","","Applied Sciences","Applied Thermodynamics and Phase Behaviour","","Materials Science and Chemical Technology","",""
"uuid:ca395867-dbbb-49a7-bd8c-f4888b578262","http://resolver.tudelft.nl/uuid:ca395867-dbbb-49a7-bd8c-f4888b578262","Modelling the impact of an offshore breakwater on the shore","Bos, K.J.","Booij, N. (mentor); Van de Graaff, J. (mentor); Roelvink, J.A. (mentor); D' Angremond, K. (mentor)","1996","This report is the result of a master thesis of the author, student at Delft University of Technology, faculty of Civil Engineering. The study was carried out at DELFT HYDRAULICS. In this report the effects of an offshore breakwater on the shore are investigated with the morphodynamic models DELFT2D-MOR and DELFT3D. These, respectively 2-dimensional horizontal and quasi 3-dimensional models, were developed by DELFT HYDRAULICS. The offshore breakwater lay-out simulated in this study serves as a test case for these two models. The breakwater lay-out simulated in this study is subjected to the action of both normal and oblique incident waves. In the former case no current is present since the computations are executed in the absence of tide. In the case of oblique waves a wave-driven longshore current is present. Within the 2-dimensional model the cross-current transport mechanisms are neglected which result in unrealistic bottom profile evolutions. However, bearing this in mind the results are still very useful for getting insight into the littoral processes. A comparison of the model results with laboratory and field data shows that the model is able to simulate the dominant morphodynamic features induced by the offshore breakwater. In the case of normal incident waves, sediment is trapped into the lee of the breakwater from both lateral sides forming a tombolo in the equilibrium state. In the case of oblique incident waves also a tombolo is created while heavy erosion occurs at the down-stream side. However, after tombolo forming accretion occurs at the up-stream shore which finally results in bypassing and filling of the down-stream scour hole. Before simulating the offshore breakwater lay-out with the quasi 3-dimensional model a number of errors had to be detected and removed from the numerical model. Furthermore, two improvements had to be made. First, it was noticed that the dissipation had to be incorporated into the 'continuity corrections' in order to reduce the number of calls of the wave and flow module. This reduces the required computational time considerably. Second, a better estimation of the bed-level celerity was made in order to guarantee numerical stability. Next the breakwater lay-out was applied to the Q3D model. In these computations the sediment transport by the secondary current and the resulting bottom profile evolution is clearly visible. Furthermore, the resulting bathymetry has less steep slopes due to the crosscurrent transport mechanisms. However, the resulting bathymetry contains very irregular bottom contour lines. So locally high transport rates occur which result in a decrease of the computational time step and, consequently, an increase of the required computational time. It is shown that accounting for the flow velocities in the wave computation (wave-current interaction) improves these results considerably. The resulting bathymetry contains less irregular contour lines.","offshore breakwater; coastal protection; coastal morphology; Delft3D","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:9113c886-296b-463c-8a1f-b3cba51d8de8","http://resolver.tudelft.nl/uuid:9113c886-296b-463c-8a1f-b3cba51d8de8","Bouwmethoden voor de afritten van de Blankenburgtunnel","Bos, F.A.","Glerum, A. (mentor)","1991","Dit project betreft het zoeken naar, en in detail uitwerken van, een constructie-methode voor het bouwen van de afritten van de Blankenburgtunnel. Het gebruik van een bemalen bouwput is niet toegestaan in verband met de omgevingsschade. In dit voorstudierapport Zijn alle bekende methoden voor een bouwkuip-constructie beschreven en met elkaar vergeleken. Deze methoden zijn: -damwanden in een afsluitende laag -damwanden in combinatie met een injectielaag -bouwput met een waterdicht vlies -prefabricage van de tunnelafritten -damwanden in combinatie met onderwaterbeton Bij de afweging bleek alleen de onderwaterbeton-variant een geschikt alternatief te zijn. Een gewichtsvloer wordt door het hoge betongebruik niet meer toegepast zodat alleen een onderwaterbetonvloer in combinatie met trekpalen in aanmerking kwamen. Nu blijven er nog twee alternatieven over: * ongewapend onderwaterbeton * gewapend onderwaterbeton Deze alternatieven worden in de hoofdstukken 10 en 11 beschreven. Daarbij is onder andere ingegaan op de stortmethoden, aanhechting van beton op palen en damwand, plaatsing van wapeningsnetten en dilatatie-voegen, vereiste betondekking en betonkwaliteit. De keuze tussen gewapend- of ongewapend onderwaterbeton blijkt slechts van economische factoren af te hangen. Een kostenafweging tussen beide alternatieven is gemaakt voor een tunnelmoot van een lange tunnel in het CUR-VB rapport 102. De gewapende onderwaterbetonvloer bleek hierbij goedkoper te zijn, ondanks de gecompliceerde uitvoering. Om duidelijkheid te krijgen of dat bij de Blankenburgtunnel ook zo is wordt in de tweede fase van het project het gewapende onderwaterbeton-alternatief in detail uitgewerkt met onder andere aandacht voor: de stortmethode, paalfundering, plaatsing van de wapening en de dilatatievoegen en uiteindelijk een kostenraming. Een antwoord op de vraag of het haalbaar is gewapend onderwaterbeton bij de Blankenburgtunnel toe te passen wordt in het eindrapport gegeven.","bouwkuip; tunnel; wapening; onderwaterbeton","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","","51.90000, 4.27000"
"uuid:49314710-5e83-4e08-8e33-cac868ee7e1b","http://resolver.tudelft.nl/uuid:49314710-5e83-4e08-8e33-cac868ee7e1b","Elektromechanisch gedrag van nitrilrubber: Een onderzoek naar de herkomst van elektrostrictie in rubbers","Bos, M.","Posthuma de Boer, A. (mentor)","1990","Materialen die elektromechanisch gedrag vertonen kunnen elektrische en mechanische energie in elkaar omzetten. Het verschijnsel dat een elektrisch veld een mechanische deformatie veroorzaakt wordt elektrostrictie genoemd. Elektrostrictie wordt veroorzaakt door Coulomb-aantrekking tussen gepolariseerde ladingen. In rubbers met een polaire zijgroep is recent een zeer groot elektrostrictie-effect gevonden door Binnendijk [ 27 ] en Van der Ven [ 30 ]. Zij vinden rekken tot tienden procent in middelmatig sterke velden. De elektrostrictie in nitrilrubber is in een statisch elektrisch veld onderzocht. Met een verplaatsingsopnemer is de rek ten gevolge van het veld bepaald. Er zijn experimenten uitgevoerd om het effect op verschillende tijdschalen en temperaturen te onderzoeken. Speciale aandacht is besteed aan het elektrode materiaal. De elektromechanische eigenschappen zijn gekoppeld aan de structuur, de elektrische ( diëlektrische constanten ) en de mechanische (elasticiteit en viscositeit) eigenschappen van het materiaal en de geometrie van het proefstuk. Er is gevonden dat de optredende elektrostrictie evenredig is met het kwadraat van de veldsterkte en dat het een hystereselus vertoont in semi-statische velden. Het effect is opgebouwd uit twee delen. Het eerste is klein en momentaan, het tweede is traag en sterk afhankelijk van de historie van het proefstuk. Er is gevonden det effect groter en sneller wordt bij hogere temperatuur. Door de combinatie van een warmtebehandeling en een elektrisch veld ( polen ) wordt het materiaal schoongeveegd. Er wordt gevonden dat de geleiding en het elektrostrictie-effect afnemen door het polen. Deze afname is definitief. Geconcludeerd is dat het eerste, kleine effect wordt veroorzaakt door moleculaire polarisatie en polarisatie van de nitrildipolen, het tweede door polarisatie van vrije ladingdragers aan grensvlakken ( Maxwell-Wagner effecten ) of door opbouw van ruimteladingswolken. De structuur bestaat uit een matrix van rubber met kristalletjes, waarschijnlijk is dit acrylonitril. De ruimteladingspolarisatie en de glasovergang van de acrylonitrilfase zijn gekoppeld. Mogelijk zijn de ruimteladingen in de glasfase ingevroren en komen vrij bij de glasovergangstemperatuur. Bij hogere temperatuur verdwijnt het elektrostrictie- effect door ruimteladingspolarisatie, waarschijnlijk doordat de elektroden de ladingen doorlaten of absorberen.","","","master thesis","","","","","","","","","Applied Sciences","Scheikundige Technologie en der Materiaalkunde","","Technologie van Macromoleculaire Stoffen","",""
"uuid:b350a76e-05fc-4c74-9b01-796eddc28b12","http://resolver.tudelft.nl/uuid:b350a76e-05fc-4c74-9b01-796eddc28b12","Diëlektrische eigenschappen van vloeibaarkristallijne zijketenpolymeren: Literatuur scriptie","Bos, M.","Posthuma de Boer, A. (mentor)","1990","Zijketen LCP's zijn opgebouwd uit een polymeer met in de zijketens molekulen die een vloeibaarkristallijne fase kunnen vormen (deze noemt men mesogenen). De mesogenen zijn stijve molekulen met een groot dipoolmoment (bijvoorbeeld cyanobip¬henyl). De mesogenen kunnen onafhankelijk van de hoofdketen bewegen. Hierdoor zijn zijketen LCP's quasi hybride materialen. De polymere hoofdketen geeft het materiaal de visco-elastische eigenschappen van een polymeer en het stijve en polaire deel in de zijketen geeft het de eigenschappen van een laagmoleculair vloeibaarkristal. De vloeibaarkristallijne fase van LCP's treedt op boven het glaspunt van het polymeer. In deze fase zijn de zijketens geordend. De oriëntatie van de ordening is in de vloeibaarkristallijne fase van de meeste zijketen LCP's niet te beïnvloeden door uitwendige krachten. Maar vlak onder of op de overgangstemperatuur naar de isotrope vloeistof is de oriëntatie van de vloeibaarkristallijne fase te sturen door het materiaal langzaam af te koelen in een richtend elektrisch of magnetisch veld.","","nl","student report","","","","","","","","","Applied Sciences","Scheikunde en der Materiaalkunde","","Technologie van Macromoleculaire Stoffen","",""
"uuid:0e951c87-80cf-4bd5-9fb7-87d3666983e3","http://resolver.tudelft.nl/uuid:0e951c87-80cf-4bd5-9fb7-87d3666983e3","Het versterken van epoxyhars met polyestervezel","Bos, E.H.A.","","1971","De mechanische eigenschappen, zoals de elasticiteitsmodulus en de toelaatbare belasting, van gietharsen die versterkt zijn met glasvezel nemen soms als gevolg van de slechte hechting tussen de hars en het glas sterk af onder invloed van de weersomstandigheden. Door gebruik te maken van synthetische vezels als versterkingsmateriaal voor een giethars kan een veel betere hechting tussen de hars en de vezel verwacht worden, omdat deze beide gecombineerde materialen een niet wezenlijk verschillende geaardheid hebben…","","nl","master thesis","","","","","","","","","Applied Sciences","","","","",""
"uuid:50b4fab1-d242-40bc-be8f-c7b016d96e01","http://resolver.tudelft.nl/uuid:50b4fab1-d242-40bc-be8f-c7b016d96e01","Enige werkzaamheden aan de gel permeatie chromatograaf","Bos, A.","","1968","De Gel Permeatie Chromatograaf, in gebruik op het Fysisch Chemisch Laboratorium van de Technische Hogeschool Delft, is daar geassembleerd. Ten opzichte van de standaarduitvoering van Waters zijn er enkele wijzigingen aangebracht (onder meer thermostaatregeling). In eerste instantie was het apparaat voorzien van twee monsterkolommen (105, en 3.104 Å), daarna van vier monsterkolommen (105, en 3.104 ,103 en 250 Å). De kolom is in beide gevallen geijkt met bekende Pst-ijkmonsters. Opvallend is het verschil tussen de ijkcurve van het twee- en vierkolommensysteem. Terwijl de laatstgenoemde curve (voor zover dat nagegaan kan worden) in een log M —Ve-verband een rechte is, vertoont de andere een afbuiging in het laagmoleculaire gebied. Er is verder in dit verslag een beschouwing gewijd aan de oorzaken die het scheidend vermogen van de kolom doen verminderen en in aansluiting daarop zijn er enkele correctiemethoden, die in de literatuur voorgesteld zijn, besproken en getoetst…","","nl","master thesis","","","","","","","","","Applied Sciences","","","","",""