"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:be29707d-2e2c-44c1-a758-c0fdfded915a","http://resolver.tudelft.nl/uuid:be29707d-2e2c-44c1-a758-c0fdfded915a","4D Printing: Post-processing for the masses","Dijkstra, Bas (TU Delft Industrial Design Engineering)","Doubrovski, E.L. (graduation committee); Ozdemir, Mehmet (mentor); Delft University of Technology (degree granting institution)","2024","class=""MsoNormal"">This research investigates the challenges a user faces in the activation step in shape-changing products. First, previous research on the topic of 4DP is reviewed and important factors are described. Namely, activation temperature, print temperature, print speed, and layer height have a signifi cant impact on the shrinkage of SMPs, during the activation step in 4DP. These shrinkages can be applied to an object through the use of varying strategies. These strategies show there are two ways of applying SMPs to a design, either calculate the shrinkage or create limits with the use of geometry-based end stops. Lastly, a further review is conducted into the type of products made with 4DP. These products turn out to be made out of three categories; fl at-packed, custom fi tment, and energy-absorbing structures. The second chapter, Material Tinkering & Exploration, delves into the material characteristics of LW-PLA, showcasing its utility for shapechanging. LW-PLA can be used both as a passive and active element, reducing environmental impact by enabling or disabling shape memory through micro-scale structural changes. This material is then used to fi nd a correlation in curvature and ratio of active versus passive elements within a design. Furthermore, the material is used to fi nd the best type of heat source, trying to create the most consistent outcomes. The oven without convection is then chosen as it creates the most consistent outcomes by limiting user interaction and making use of slower response times. The following chapter brainstorms ideas that can make use of shape change. Through the use of criteria and Edison profi les a direction is chosen. This is the direction of the temples of glasses. Shape change can add to this product as the temples vary in length to fi t different users. This chapter also creates two prototypes to be tested, differing in the type of measurement method. Lastly, the design is evaluated through the use of two user studies. In the fi rst study, the focus is laid on the type of measuring method. The external measurement method comes out as the most promising as it creates the most consistent outcome with the users. The second test tries to minimize the error between the targetted length of the temple and the actual length after the activation process has ended. The result is an addition of two test samples that educate the user. Through the education of the user, a consistent result with minimal error can be achieved. The activation step also requires a homogeneous method of heating the temple, small deviations in this heating lead to unwanted curvature. This is combatted by creating a tray, that is delivered together with the temple.","4D Printing; Shape Memory Polymer; Shape Memory Activation","en","master thesis","","","","","","","","","","","","Integrated Product Design","",""
"uuid:fbfc13c2-dd18-4868-8203-2dca1c157104","http://resolver.tudelft.nl/uuid:fbfc13c2-dd18-4868-8203-2dca1c157104","Automation in Horticulture:: Design and Evaluation of a Cost-Effective Parallel Robot Arm","Dijkstra, Mathijs (TU Delft Mechanical, Maritime and Materials Engineering; Festo B.V.)","Smit, G. (mentor); Koudijzer, Jan (mentor); Delft University of Technology (degree granting institution)","2023","This thesis presents the conceptual development of an innovative parallel manipulator that leverages the beneficial attributes of parallel kinematic structures. These attributes include increased stiffness, uniform load distribution, and reduced moving mass, which are strategically incorporated into the design to enhance resource efficiency. This approach aims to yield more robust, cost-effective, and reliable alternatives to conventional serial manipulators. The concept is synthesized from various literature sources, leading to a detailed kinematic analysis through inverse kinematics. This analysis provides valuable insights into the mechanism's functionality and facilitates iterative design improvements. Additionally, a dynamic behavior simulation of the mechanism is conducted using Simulink's Simscape. Based on these insights, a prototype is constructed to empirically validate the design concept. The final design demonstrates a compact, fully accessible workspace with a kinematic structure conducive to robust manipulation. The load distribution is optimized across all motors, maximizing motor capacity utilization and enabling efficient handling of peak loads.","parallel manipulator; horticulture; kinematics; singularities; load distribution; analysis; prototype","en","master thesis","","","","","","","","","","","","Mechanical Engineering","",""
"uuid:07ffde04-ab60-4b71-81a5-b3c3631e944d","http://resolver.tudelft.nl/uuid:07ffde04-ab60-4b71-81a5-b3c3631e944d","The maximum influence of wind on wave overtopping at mildly sloping dikes with a crest element","Dijkstra, Sam (TU Delft Civil Engineering & Geosciences)","van Gent, M.R.A. (mentor); Wüthrich, Davide (mentor); Wolters, Guido (mentor); Delft University of Technology (degree granting institution)","2023","Due to the rising sea level in combination with land subsidence there is a need to reinforce the dikes. The use of a crest element to increase the height of the dike is an effective and relatively cheap way to reinforce the dikes (Hogeveen, 2021). When a crest element is used, the jet generated by wave breaking on the dike slope impacts on the crest element, leading to an upward spraying motion of the water. This upward sprayed water can potentially be transported by the wind over the crest element and therefore contribute to the wave overtopping discharge. Small scale physical model tests were performed on a smooth dike slope of 1:6 to gain more knowledge about this influence of the wind on wave overtopping. Studying the influence of the height of the crest element, a promenade in front of the crest element and the slope of the dike was part of the research.","coastal engineering; wind influence; wave overtopping; Crest elements; Promenade; Hydraulic Engineering","en","master thesis","","","","","","","","2024-08-31","","","","Civil Engineering | Hydraulic Engineering | Coastal Engineering","",""
"uuid:b4be3b48-e2ed-4646-adc6-ff7f924edaad","http://resolver.tudelft.nl/uuid:b4be3b48-e2ed-4646-adc6-ff7f924edaad","Self-calibrated plant counting in early crop stand scenarios using deep clustering: Jonacount: make every plant count","Dijkstra, Jonathan (TU Delft Electrical Engineering, Mathematics and Computer Science)","Dauwels, J.H.G. (mentor); van Veelen, F. (graduation committee); Langendoen, K.G. (graduation committee); Delft University of Technology (degree granting institution)","2023","In recent years, the agricultural sector has seen significant techno- logical improvements under the flag of precision agriculture, assisting farmers in the manageability that coincides with large-scale farming. Moreover, precision agriculture aims to enable plant-specific farming on the macro scale that is demanded by the current global population growth. By more closely matching the individual needs of the plants, farmers are able to increase crop yield while reducing the environmen- tal footprint as well as the economic cost of farming due to savings in fertilizers and pesticides. Visual inspection of arable land is a key factor in maintaining trace- ability of plant growth and health in precision farming. More specif- ically, plant counting, size measurement and plant localisation are of great use for farmers in yield prediction, growth tracking, and obtain- ing insight in the emergence ratio of the crop. Most of the state-of-the-art plant counters, or object counters in gen- eral, rely on human annotations (labour intensive and error prone) as exemplars for the counting model. Self-supervised object counting, however, is a machine learning paradigm independent of human la- belled data, enabling an object counter to learn solely from raw photo- graphic data. Furthermore, the generative character of self-supervised learning models implies the potential to generalize well on unseen data to the model, such as new plant species or variations in plant size in the case of plant counting. In this master’s thesis in cooperation with Tective Robotics, a study is performed towards the design of self-calibration based self-supervised object counting and localisation model for the scenario of early crop stand scenarios. More specifically, a novel self-calibrator has been developed to estimate the planting distance in between crops and a threshold for small object noise filtering (weeds, loose leaves ect). Im- plications of the self-calibrator are robustness to variations in plant size and allignement, accurate segmentation of occluded plant clusters and small-sized weed suppression. Model testing on UAV orthomosaic arable land imagery collected by Tective Robotics B.V. has shown outstanding performance (R2 = 0.94) of the newly developed plant counting model, without the need of any labelled training data. The plant counter is comparable in performance to some of the commercially available plant counters. The plant counter, embedded in the entire data processing pipeline for Geotiff orthomosaics, has been made available on GitHub.","plant counting; self-supervised learning; machine learning","en","master thesis","","","","","","","","","","","","Electrical Engineering | Embedded Systems","",""
"uuid:31e2b4df-d9d4-499b-a377-26f1b087c817","http://resolver.tudelft.nl/uuid:31e2b4df-d9d4-499b-a377-26f1b087c817","Field notes for food cultures: Developing a culture sensitive design guide for the Protein Transition","Dijkstra, Maaike (TU Delft Industrial Design Engineering)","van Boeijen, A.G.C. (mentor); Peeters, A.L. (graduation committee); Delft University of Technology (degree granting institution)","2023","The Protein Transition is a societal transition that resolves around shifting society towards consuming more plant-based proteins instead of animal proteins. There are numerous drivers for this transition, the most well-known and considerable ones being climate change, animal welfare, public health and unfair agricultural economics.
To accelerate the Protein Transition, we need to understand the role and impact of food cultures in this transition. Culture is recognised as a promising strategic lever for accelerating societal transitions, but literature and methodology on the subject are limited. The intersection of transition design and culture has never been explicitly studied up until now. This thesis aims to fill the knowledge gap on how culture can impact societal transitions and what design methodology is needed to address this.
The thesis focuses on Dutch food culture. Animal proteins play a significant role in Dutch food culture. They are part of many rituals, traditions and behaviours. This is the result of a collection of socio- behavioural and cultural factors, including, but not limited to, meat and dairy being part of the Dutch identity, the government undertaking conscious efforts to increase meat and dairy consumption, a feeling of entitlement to meat and dairy, and meat and dairy being regarded as symbols of wealth and prosperity.
After gaining an understanding of Dutch food culture, it was decided to continue by studying a specific food culture. The borrel is a uniquely Dutch eating practice that can be considered its own food culture because of the many symbols and rituals linked to it. The methods used were a historical analysis,
interviews, observations and culture sensitive design models. By studying Dutch food culture and borrel culture, knowledge has been accumulated on how to study a food culture effectively.
This comes down to the seven principles for culture sensitive design for the Protein Transition:
1. History: How did we get here?
2. Consider the whole system (macro - meso – micro).
3. Scoping: Food cultures are huge; you cannot study them all.
4. Embrace diversity: Acknowledge different perspectives and conflicts.
5. Be aware of your own biases and experiences.
6. Keep your goal in mind.
7. Developing cultural sensitivity for transition design is a lifelong process.
All the accumulated knowledge has been compiled into a field guide for designers: the Food Culture Field Guide, which consists of an A6-sized guidebook and a card deck with 35 cards. The field guide contains information on studying (Dutch) food cultures and guides designers in their design process. This will help them create more culturally sensitive design interventions to accelerate the Protein Transition.","Protein Transition; Sustainability; Food Design; Meat alternatives; Meat consumption; Culture; Culture Sensitive Design; Food Culture; The Netherlands","en","master thesis","","","","","","","","","","","","Strategic Product Design","",""
"uuid:e5d31c1f-121d-4f2b-8ea2-a6cdbc059b0c","http://resolver.tudelft.nl/uuid:e5d31c1f-121d-4f2b-8ea2-a6cdbc059b0c","Unlocking the Potential of Public EV Charging: A machine learning approach for the prediction of individual public EV charging session flexibility","Dijkstra, Bart (TU Delft Technology, Policy and Management)","Kroesen, M. (graduation committee); Afghari, A.P. (mentor); van Duin, Ron (mentor); van Dijk, Jules (mentor); Delft University of Technology (degree granting institution)","2023","","EV charging forecasting; EV charging behavior; Individual charging session flexibility; Smart charging","en","master thesis","","","","","","","","2025-04-24","","","","Complex Systems Engineering and Management (CoSEM)","",""
"uuid:3636ddbe-070a-4d17-aafc-78cc2ede6091","http://resolver.tudelft.nl/uuid:3636ddbe-070a-4d17-aafc-78cc2ede6091","CSD Hydrodynamics: An analysis of a CSD in coastal conditions, and the effect of flexible spud keeper configurations on the hydrodynamic response","Dijkstra, Jesse (TU Delft Mechanical, Maritime and Materials Engineering)","van Rhee, C. (mentor); Miedema, S.A. (mentor); Helmons, R.L.J. (mentor); Smeets, Floris (mentor); Delft University of Technology (degree granting institution)","2023","Cutter suction dredgers (CSD) are highly vulnerable to large wave loading due to their stiff, spud-based mooring. Many mitigations targeted at reducing the resulting stresses on the spud and other critical operating components have been proposed in recent years, most notably by adding a level of flexibility to the connection between the pontoon and the spud for rotational motions. Investigating the merits of the implementation of a flexible spud keeper however are hindered by the lack of accurate, CSD-specific models that are able to simulate real waves in the working area, as well as the multibody system of a CSD and its complex interactions with the sea floor. In this thesis, an ANSYS AQWA model is developed to conduct an operability analysis of a CSD in operation in offshore, coastal conditions. Three modelling objectives were established to provide a complete analysis of the effect of increased flexibility in a spud keeper: adding non-linear wave effects, improvement of the soil boundary conditions, and building a dynamic multibody system of a CSD in ANSYS AQWA.
A wave model is developed that expands upon standard Linear Wave Theory (LWT) through the use of Stokes 2nd Order Wave Theory (S2). S2 was found to be valid for a larger range of water depths and wave parameters than other wave theories, mainly in shallow, coastal conditions, which is the main operating area of a CSD. These non-linearities cannot be implemented into a frequency domain (FD) model, therefore a time domain (TD) model is required. A combination of S2 waves in a JONSWAP spectrum is used to simulate the motion and force response in TD, as well as second-order forces from the interaction of wave groups with the CSD. The model output is then used as a means of verification of these assumptions and to show the effect of the wave shapes on the spud bending stress.
An altered spud model is proposed for shallow, wide spuds, using a rotational spring system instead of the commonly used clamped model. For the use-case of a CSD it shows a spud's tendency for rigid motion below the mudline, while also providing an upper operational limit for soil failure around the spud. The model output showed this upper limit to likely not be a important operational limit, but it can be used to investigate spud rotation below the mudline. Mooring effects from the cutter are absent in older models, but are added in the form of spring elements to better approach reality.
Finally, a number of CSDs with different levels of flexibility are tested for four operational limits. The model shows a clear shift in motion resonance towards lower frequencies when the stiffness is decreased, while operability analysis in TD presents a significant increase in operability when a CSD is free to move in pitch. This completely flexible connection provides a major reduction in spud bending stress, but is governed by the acceleration limit of the pontoon. Other reduced stiffness designs are shown to only provide limited benefits to the operability.","cutter suction dredger; hydrodynamics; operability","en","master thesis","","","","","","","","2026-02-15","","","","Offshore and Dredging Engineering","",""
"uuid:45f4564b-21a5-4124-b5aa-2f2d9ac8b130","http://resolver.tudelft.nl/uuid:45f4564b-21a5-4124-b5aa-2f2d9ac8b130","Local (Commuting) THB-spline Projector","Dijkstra, Kevin (TU Delft Electrical Engineering, Mathematics and Computer Science)","Toshniwal, D. (mentor); Vuik, Cornelis (graduation committee); Visser, P.M. (graduation committee); Delft University of Technology (degree granting institution)","2022","Existence of commuting THB-spline projectors is of importance in the field of numerical mathematics. These projectors are required to show that numerical solutions to the abstract Hodge Laplace problem are stable and consistent. We have introduced a local THB-spline projector based on Bezier projection, that commutes in the one-dimensional case. Additionally, to show that the projector is well posed in the univariate and multivariate case, we have derived so called projection elements, that are grouped mesh elements, on which the THB-splines are linearly independent.","THB-splines; commuting projectors; local projectors; local linear indepence THB-splines","en","master thesis","","","","","","","","2023-11-30","","","","Applied Mathematics","",""
"uuid:8cd6c71f-c641-4315-8a2a-dba3117d280b","http://resolver.tudelft.nl/uuid:8cd6c71f-c641-4315-8a2a-dba3117d280b","Restoration of Missing Data using a Human Adaptive Framework: The Cleansing Algorithm","Dijkstra, Sjoerd (TU Delft Electrical Engineering, Mathematics and Computer Science)","van Buuren, P. (mentor); Chen, P. (mentor); Jongbloed, G. (graduation committee); Papapantoleon, A. (graduation committee); Delft University of Technology (degree granting institution)","2022","class=""MsoNormal"">Improving data quality is of the utmost importance for any data-driven company, as data quality is unmistakably tied to business analytics and processes. One method to improve upon data quality is to restore missing and wrong data entries.
The goal of this research is construct an algorithm such that it is possible to restore missing and wrong data entries, while making use of a human adaptive framework. This algorithm has been constructed in a modular fashion and consists of three main modules: Data Transformation, Data Structure Analysis and Model Selection. Data Transformation has concerned itself with conversion of raw data to data types and forms the other modules can use.
Data Structure Analysis has been designed to deal with correctly missing data and dichotomy in the target feature by making use of three clustering algorithms: DBSCAN, K-Means and Diffusion Maps. DBSCAN is used to determine the necessity of clustering as well as the initialisation of the K-Means algorithm. K-Means and Diffusion Maps have been used as clustering methods in the one-dimensional target feature and the two-dimensional input-target feature pairs, respectively. Data Structure Analysis has further been designed to perform feature selection through three filter methods: CorrCoef, FCBF and Treelet.
Model Selection has proposed a novel approach to selection of the best model of a candidate set through the optimisation of a conditional model ranking strategy based on the prior construction of theoretical testing. Our candidate set consisted of Expectation Maximisation, K-Means, Multi-Layer Perceptron, Nearest Neighbor, Random Forest, Linear Regression, Polynomial Regression, ElasticNet Regression.
In terms of restorability, it was shown that the optimal configuration of the Cleansing Algorithm for the restoration of missing data, was provided by opting not to use clustering, using a custom alteration to the Treelet algorithm for feature selection and making use of the model selection strategy. This not only lead to the greatest restorability of 56.90% on Aegon data sets, which was an improvement of 44.83% when compared to not using the Cleansing Algorithm, but also to the reduction of computation time by over 400%. A more realistic restorability due to the presence of correctly missing data, was given by the same configuration making use of one-dimensional output clustering. This resulted in a restorability on Aegon data sets of 43.10%. As such it was deemed possible to restore missing data on Aegon data sets.
With respect to the human adaptive framework, it was determined that the construction of the algorithm be modular in the sense that any alternate feature selection or clustering approach can be implemented with ease. Furthermore, the model selection module allows us to customize the theoretical testing and choice of regression or classification models for the restoration of missing data. In doing so, the algorithm has laid the foundations for human adaptivity of the Cleansing Algorithm.","Missing Data; Restoration; Clustering; Feature Selection; Model Selection","en","master thesis","","","","","","","","","","","","Applied Mathematics","",""
"uuid:44c8cf8d-bb27-4e33-aa96-4d1de2889f2d","http://resolver.tudelft.nl/uuid:44c8cf8d-bb27-4e33-aa96-4d1de2889f2d","Changes in runup characteristics between swash and collision conditions: a Field Study","Dijkstra, Twan (TU Delft Civil Engineering and Geosciences)","de Vries, S. (graduation committee); Tissier, M.F.S. (graduation committee); van Wiechen, P.P.J. (mentor); Rutten, J. (graduation committee); Delft University of Technology (degree granting institution)","2022","Estimating wave runup is of crucial importance during a coastal risk assessment. Currently, runup levels are usually calculated using empirical formula derived from experiments conducted at beaches all over the world, and during different beach states. During this research, conditions are analyzed where runup reaches the dune toe and above. The main objective of this research is to examine the changes in the runup characteristics, which are the wave setup, the infragravity swash motions (low frequency wave motion) and the incident swash motions (high frequency wave motion). In order to examine these conditions, a fieldwork experiment has be conducted at the Sand engine near Kijkduin (South Holland). a dune of 150 (m) in width and 5.5 (m) above NAP (Nieuw Amsterdams Peil) have be constructed near the waterline. Instruments have been installed which have monitored the incoming wave conditions and the behavior of the hydrodynamic conditions at the waterline. One of these instruments was an instrument new to measurements conducted at the coast. This was a LLC (Line scanning Low Cost) LiDAR, which was used to track the runup during extreme wave conditions.
The LLC LiDAR was evaluated in terms of measuring the nearshore hydrodynamics by comparing the water level measured by the LLC LiDAR to the water level measured by a pressure sensor. The water levels from both instruments compared well with an 𝑅2 ranging from 𝑅2 = −0.86. The match in the peaks of the water levels were lower, showing 𝑅2 in the range of 0.34 − 0.78.
Data from the Fieldwork Experiment showed an increase in incident swash wave height during collision conditions when compared to swash conditions. Although the nearshore wave field showed similar conditions between the swash and collision conditions, the swash height showed an increase. Several parameters have been investigated to find the dependence of runup height to the offshore wave or beach characteristics. A best fit is found between runup and the beach slope (𝑅2 = 0.86), also indicating that swash motions are significant. Runup heights during these conditions are also compared to an empirical runup formula. This comparison indicated that runup elevations could still be predicted during conditions where runup reaches above the dune toe elevation.","runup; SWASH; LiDAR","en","master thesis","","","","","","","","","","","","Civil Engineering","REALDUNE/REFLEX",""
"uuid:729a5979-9f1e-4baa-b29e-111455a1e0c3","http://resolver.tudelft.nl/uuid:729a5979-9f1e-4baa-b29e-111455a1e0c3","Optimize the indescribable: A Look at the Unification between Machine Learning and Optimization","Dijkstra, Finn (TU Delft Electrical Engineering, Mathematics and Computer Science)","Postek, K.S. (mentor); Nane, G.F. (graduation committee); Delft University of Technology (degree granting institution)","2022","Packages to encode Machine Learned models into optimization problems is an underdeveloped area, despite the advantages is could provide. The main draw of implementing Machine Learned models into optimization models, is that it allows the optimizer to better account for the human experience.
Maragno D., Wiberg H. et al. constructed an implementation of the encoding with their package OptiCL. In order to verify their implementation and provide principles for (re)designing packages with similar functions, an amount of components of OptiCL were replicated within this paper. The requirements for
the program were first constructed before detailing the implementation process. After the program was implemented, both OptiCL and the found program were tested in order to compare performances. Using the results and an investigation of the two implementations, a framework for encoding similar packages
was provided using the insights gained. Using mathematical formulations supplied by Maragno D., Wiberg H. et al., design principles outlined in this report and research into the encoding of other Machine Learned models, other developers could construct robust packages that allow for easy integration of
valuable information gained from Machine Learning into optimization problems. This in turn allows for frequently used optimization models to account for more human understanding.","optimisation; Machine learning; Constraint; linear programming","en","bachelor thesis","","","","","","","","","","","","Computer Science","",""
"uuid:2b6e2961-2e64-4e70-95c3-8ab98bf02abc","http://resolver.tudelft.nl/uuid:2b6e2961-2e64-4e70-95c3-8ab98bf02abc","Protecting the south-west of the Netherlands against flood using an adaptive design approach","Smits, Xander (TU Delft Civil Engineering and Geosciences; TU Delft Technology, Policy and Management); Middendorp, Rosalie (TU Delft Civil Engineering and Geosciences); Kyrizakis, Kyriakos (TU Delft Civil Engineering and Geosciences); Hemel, Jean-Marie (TU Delft Civil Engineering and Geosciences); Dommerholt, Naomi (TU Delft Civil Engineering and Geosciences); Dijkstra, Sam (TU Delft Civil Engineering and Geosciences)","Voorendt, M.Z. (mentor); Timmermans, Jos (mentor); Rutten, M.M. (mentor); Visser, J.L. (mentor); Delft University of Technology (degree granting institution)","2022","The Netherlands is world famous when it comes to coastal defence. The world is always changing, therefore the Netherlands, together with many countries, has to adapt constantly to the climate. This constant change means that in particular the coastline of the Netherlands requires extra attention because of the uncertainty of sea level rise. The Dutch coastline is protected by means of a static approach. However the intention for the future is to apply an adaptable design to better handle sea level rise. This report focuses on a method that uses a dynamic approach with the aim of keeping the Netherlands protected against rising sea levels that are uncertain. This dynamic approach consist of several pathways that each consist of different actions. With the help of evaluation-criteria, the pathways in the dynamic approach are evaluated. The outcome of this evaluation is described and recommendations for future research are given.
The report focuses on keeping the coastline of the south-west of the Netherlands protected against the uncertainty of the rising sea. This will be done with the help of a dynamic approach. First, an area analysis was carried out to find out what aspects should be given the most attention. After that, the method of DAPP is used to function as a dynamic approach. This Dynamic Adaptive Pathway Policy is then used to implement the different pathways in a structured way. These pathways are made up of different actions. These actions are existing plans presented by Deltares and they form a big list. Not all plans do function properly in order to function as a flood protection and so a selection method is used to extract the right plans out of this list. The requirements that are used to select the right plans have its main focus on protecting the hinterland against sea level rise, storm surge and wave load. The extracted plans that function as an action are implemented in the different pathways of the DAPP. To evaluate these pathways, evaluation-criteria are used in a Multi Criteria Analysis. These criteria are extracted from sources like a stakeholder analysis, old and new watermasters and a brainstorm session with the group members who act through their own accumulated expertise. The extracted criteria in combination with determined weighting factors are placed in a Multi Criteria Analysis after which the pathways have been assessed individually. This evaluation process led to some pathways being iterated to a different shape for the final design of the DAPP.
From the project can be concluded that the DAPP approach works well to combine different static plans into a comprehensive mitigation strategy. Secondly the evaluation criteria can be successfully derived from the old and new watermasters. The old watermasters already have one or more of their plans implemented. The new watermasters, are working on flood protection plans for the future in their daily life and have a lot of experience in the current engineering field. From the stakeholder analyses, the criteria can also be derived but than from the perspective of a variety of stakeholders. Thirdly, organizing criteria using a PESTLE (Political, Economic, Social, Technological, Environmental) and objectives tree has significant benefits for determining weighting factors. At last, it can be concluded that the main requirements used in this project are a good starting point, but they are only focused on reducing the flood risk (only technology). To select plans on a wider perspective(also Political, Economic, Social, Legal and Environmental), it is recommended to take a closer look to requirements from that perspectives. Advised is to consult experts in those fields to help with that.","","en","student report","","","","","","","","","","","","Civil Engineering | Hydraulic Structures","",""
"uuid:7aa108c7-29d1-442d-ab2d-3df17575a39c","http://resolver.tudelft.nl/uuid:7aa108c7-29d1-442d-ab2d-3df17575a39c","Experimental design of an alkali-activated slag concrete railway sleeper","Dijkstra, Timo (TU Delft Civil Engineering and Geosciences)","Ye, G. (graduation committee); Dong, H. (mentor); Markine, V.L. (graduation committee); Delft University of Technology (degree granting institution)","2021","This research aims to improve the sustainability of Dutch prestressed concrete railway sleepers. Approximately 100.000 to 200.000 sleepers are used every year, corresponding to 12.000 to 24.000 tonnes of concrete. This will be done by replacing cement with an alkali-activated binder. The cement industry is responsible for approximately 5 to 7% of the global CO2 emission, whereas the alkali-activated binder uses no cement. Instead, by-products will take over the role of cement in concrete, activated by high pH alkalies. This research can be subdivided into four parts: Deciding the requirements, designing for the mechanical properties, determining the durability properties and conducting a Life Cycle Analysis (LCA). The main requirements follow the product specification of the railway infrastructure manager ProRail. Some requirements on manufacturability follow from a market consult. Ground granulated blast furnace slag is used as a precursor due to its availability in the Netherlands, unlike other potential candidates. An iterative mix design procedure is conducted to come to three mixes, meeting the requirements for the fresh concrete and the mechanical properties. The three mixes differ based on the binder content and activator dosage. Nineteen different mixes are designed, of which the final three meet all the mechanical and manufacturability requirements. These three mixes are subjected to tests to determine non-required mechanical properties, such as the tensile strength or the material’s elastic modulus. Finally, the durability of the newly designed alkali-activated slag concrete is assessed. Results show the designed concretemeets the requirements for fresh and hardened concrete. The results of the other mechanical properties are similar or better to the concrete mixes used nowadays to produce sleepers. However, not all requirements on durability are met. Due to the unavailability of certain test conditions, a direct result cannot be given. Therefore, the three durability properties are assessed by comparing the results of this research with results from the literature. The comparison for electrical resistivity shows an excellent behaviour, better compared to similar OPC concretes and on par with CEM III/B concrete types. The alkali-activated binder demonstrates less damage under a freeze-thaw attack with de-icing salts than other alkali-activated concretes but still fails to meet the requirement set by ProRail. The accelerated carbonation test indicates a similar carbonation resistance compared to other alkali-activated concrete types but a lower resistance compared to similar concrete. More research is necessary to investigate these properties further. The environmental impact of the concrete used to produce a sleeper is reduced by 34 to 68%compared to a CEM III/B or OPC binder, respectively. Taking into account the global warming potential only, these numbers increase to 75 to 90% respectively. The total environmental impact of a complete sleeper, including steel and plastic components, is lowered by 12 to 35%. This is explained by the fact that the steel and plastic components contribute 75% to the environmental cost, and improving the cost of these components is beyond this research’s scope. This research shows a significant potential to improve the sustainability of concrete structural elements by replacing the cement binder with an alkali-activated binder. This binder is capable of meeting the mechanical requirements, shows good workability. The compressive strength values are comparable to high strength concrete. Further research has to be conducted in the fields of behaviour under carbonation and freeze-thaw attacks. With these results and conclusions, this research has attributes to realizing more sustainable railway sleepers using an alkali-activated binder.","Alkali-activated concrete; Railway infrastructure","en","master thesis","","","","","","","","2026-12-31","","","","Civil Engineering","",""
"uuid:82c1bc40-6d73-4712-96ab-e8a5960d6330","http://resolver.tudelft.nl/uuid:82c1bc40-6d73-4712-96ab-e8a5960d6330","Determinacy of Infinite Games","Dijkstra, Jelle (TU Delft Electrical Engineering, Mathematics and Computer Science)","Hart, K.P. (mentor); Kraaikamp, C. (graduation committee); Delft University of Technology (degree granting institution)","2021","This paper introduces the notion of infinite games, i.e., games in which two players take turns playing moves ad infinitum, so that player I wins if the sequence of moves is in a predetermined payoff set. Theorems are then provided about whether a player in such games can have a winning strategy. The first theorem, Gale-Stewart, shows that games with an open or closed payoff set are determined, i.e., one of the players has a winning strategy. The second theorem, Martin, shows moreover that any game with a Borel payoff set is determined. Finally, the paper presents some results that follow from these theorems, for instance that the Continuum Hypothesis holds for all Borel sets. This paper only requires knowledge of very basic set theory and will clearly define any new or otherwise unfamiliar concepts.","Analysis; Descriptive Set Theory; Game Theory; Trees; Games","en","bachelor thesis","","","","","","","","","","","","Applied Mathematics","",""
"uuid:9967d889-a042-46dc-99b7-421385eea43a","http://resolver.tudelft.nl/uuid:9967d889-a042-46dc-99b7-421385eea43a","Assessment of Very High Energy Electron therapy as a clinical modality for external beam therapy","Dijkstra, Jasper (TU Delft Mechanical, Maritime and Materials Engineering)","Lathouwers, D. (mentor); Heijmen, Ben (graduation committee); Delft University of Technology (degree granting institution)","2020","class=""MsoNormal"">Very high energy electron (VHEE) radiotherapy is being investigated as a potential replacement of photon therapy. VHEE pencil beams have a small penumbra and strong depth dependence for radiotherapy when compared to photons. This allows a lower dose to healthy tissue. Generating these high electron energy beams could be achieved by using laser accelerators. These accelerators allow the equipment to be smaller than currently possible and make it possible to fit them in a standard radiotherapy treatment bunker. This makes VHEE a potential middle ground between photon and proton therapy in relation to equipment costs and treatment quality. The purpose of this project is to compare photon based Intensity Modulated Radiation Therapy (IMRT) and VHEE treatment plans for treatment of prostate cancer. For 10 prostate cancer patients IMRT treatment plans were generated with 23 beams. These plans were optimized using Erasmus MC in-house developed Erasmus-iCycle automated treatment plan optimization tool. The dependence of VHEE plan quality on beam energy (200, 300 and 400 MeV) and number of equi-angular beams (9, 18 and 36) was investigated. The treatment plans were optimized using the multi-criterial optimizer Erasmus-iCycle. For each patient VHEE pencil beam dose distributions were pre-calculated using TOPAS MC, a Monte Carlo simulation program based on Geant4. Results: VHEE treatment plans show either a reduced or similar mean OAR dose when compared to IMRT treatment plans except for the 9 beam 200 MeV plan which was worse compared to IMRT. All treatment plans were normalized to a PTV coverage of 99 % V57Gy. It is found that the mean rectum dose reduces from 13.5 Gy for IMRT to between 9.2 and 11.9 (p=0.002-0.004) for the VHEE plans. For the anus dose a reduction in mean dose was found for all VHEE treatment plans except for the 9 beam 200 MeV and the 18 beam 200 MeV VHEE treatment plans. The mean anus dose reduced from 12.4 Gy for IMRT to 7.0 - 10.6 Gy (p=0.002-0.014) for the VHEE treatment plans. The bladder dose reduced from 20.1 Gy to between 15.2 and 18.2 Gy (p=0.002). Increasing the number of VHEE beams in a treatment plan reduces the OAR dose. Comparing 9, 18 and 36 beam treatment plans with 300 MeV. The mean rectum dose reduces from 14.0 Gy for the 9 beam plan to 11.1 Gy (p=0.002) and 9.9 Gy (p=0.002) for the 18 and 36 beam plan, respectively. The same pattern is found for the anus and bladder. Treatment plans with a higher beam energy reduces the dose to OAR. The mean rectum dose reduces from 13.4 Gy for the 200 MeV plan to 11.1 (p=0.002) and 10.0 (p=0.002) Gy for the 300 and 400 MeV plans. The same pattern is found in the mean bladder dose with 18.2 Gy, 16.8 Gy (p=0.002) and 15.9 Gy (p=0.002). The right femoral head maximum dose increases from 28.0 Gy for 200 MeV to 29.4 Gy(p=0.002) and 29.6 Gy (p=0.049) for the 300 and 400 MeV treatment plans. VHEE is a potential replacement for IMRT due to the reduced dose to healthy tissue while maintaining similar target coverage compared to IMRT. By increasing the number of beams and/or the electron beam energy we can further reduce doses to the healthy tissue. ","Radiotherapy; Radiation therapy; VHEE","en","master thesis","","","","","","","","","","","","","",""
"uuid:a9a5929f-fd38-4a74-8bed-f3eeeaaab8de","http://resolver.tudelft.nl/uuid:a9a5929f-fd38-4a74-8bed-f3eeeaaab8de","Load cell resonance frequency analyser: Frequency analysis system for load cell based conveyor belt weighing systems","van Heteren, Mauries (TU Delft Electrical Engineering, Mathematics and Computer Science); Dijkstra, Jonathan (TU Delft Electrical Engineering, Mathematics and Computer Science)","Verhoeven, C.J.M. (mentor); Delft University of Technology (degree granting institution)","2020","In this thesis, the design of a frequency analysis system for conveyor belt weighing systems is designed. The objective of the thesis is to detect a change in resonance frequency, caused by a change of pressure applied to a sensor. The design features a resolution of 10 000 discrete frequency levels in a bandwidth of 0.5 MHz. Noise division of a pseudo random noise (PRN) signal is used to obtain a clear frequency spectrum. An ADC is implemented to digitize an analog input signal. Furthermore, a digital down converter using a CICfilter and CORDIC based controlled digital oscillator is applied. The frequency-domain translation is achieved using an FFT. Lastly, an interpolation over the spectrum is realized to increase the frequency resolution. Additionally, an analytical analysis of the primary noise sources in the system is given. The entire system is simulated in MATLAB to validate the designed blocks.","resonance frequency; frequency analysis; frequency resolution; conveyor belt; wireless sensor","en","bachelor thesis","","","","","","","","2022-07-08","","","","Electrical Engineering","",""
"uuid:31e80f25-0e47-4e4e-99f0-26e936d43e90","http://resolver.tudelft.nl/uuid:31e80f25-0e47-4e4e-99f0-26e936d43e90","Breakpoint detection through neural nets: A feasibility study","Dijkstra, Fokke (TU Delft Civil Engineering and Geosciences)","Lhermitte, Stef (mentor); Smal, Ihor (mentor); Steele-Dunne, Susan (mentor); Delft University of Technology (degree granting institution)","2020","A variety of statistical methods are available to detect sudden changes, or breakpoints, in time series when used as multi-temporal change detection technique. However, these methods are unreliable in the presence of noise. Neural nets might detect breakpoints better. These deep learning models are able to generalize and optimize well, even in the presence of noise. This research tests the feasibility of different neural net architectures to detect breakpoints in generic linear time series. Two relatively simple neural nets are proposed, combined with four different descriptions of breakpoint, and trained on synthetic
data. The neural nets are tested on two datasets: On a separate synthetic dataset and on Australian rainuse-efficieny (RUE) time series, a surrogate for dryland ecosystem functioning. Some of the neural nets built performed exceptionally well on synthetic data, outperforming a benchmark statistical method with
margin. The direct translation to RUE time series was less successful. The results shows great promise for the use of neural nets in change detection. A generalist change detection approach by use of neural nets is likely not optimal. Current developments in deep learning, as well as choosing the right user-case, show
great promise to unlock the full potential of neural nets in time series analysis.","breakpoint detection; multi-temporal change detection; deep learning; neural nets","en","master thesis","","","","","","","","","","","","Geoscience and Remote Sensing","",""
"uuid:9977830b-52b8-4cd4-a09a-fdb13a08fec4","http://resolver.tudelft.nl/uuid:9977830b-52b8-4cd4-a09a-fdb13a08fec4","The elementary particles and the root system E8","Dijkstra, Kevin (TU Delft Applied Sciences; TU Delft Electrical Engineering, Mathematics and Computer Science)","Visser, P.M. (mentor); Thijssen, J.M. (graduation committee); Hart, K.P. (graduation committee); Blanter, Y.M. (graduation committee); Delft University of Technology (degree granting institution)","2019","E8 is a famous root system in mathematics. Lisi claims in his paper “An Exceptionally Simple Theory of Everything” that there is a connection between the standard model of the elementary particles and this root system. He claims that standard model has the same structure as the root system E8. If this is true, there must be a mapping from the standard model to E8. This map must identify each elementary particle with an unique root of E8. Also the four charges (weak isospin, weak hypercharge, g3 and g8) of the standard model must have corresponding vectors in R8. These four charge vectors must have the property that taking the inner product of the charge vector and the root identified withan elementary particle, it would result in the charge of that particle. This is needed to guarantee that we have conservation of charge. In this paper we have shown that it is not possible to find a map with four charge vectors. This was done by studying root systems and how different root systems are present in E8 as sub root systems. We also proved that the intersection of E8 with the orthogonal complement of a charge, must be a root system. This limits the possibilities for the charge vectors. For these possible charges it has been checked whether there are enough roots for a given charge to identify the elementary particles. Since this was not the case, we concluded that no mapping with four charge vectors exists.","Root system; E8; Elementary Particles","en","bachelor thesis","","","","","","","","","","","","Applied Mathematics | Applied Physics","",""
"uuid:5d053208-4c51-415f-bd1f-bfc9f819ebf8","http://resolver.tudelft.nl/uuid:5d053208-4c51-415f-bd1f-bfc9f819ebf8","Analysis of the impact of news on the financial market","Dijkstra, Sjoerd (TU Delft Electrical Engineering, Mathematics and Computer Science)","Anderluh, Jasper (mentor); van Elderen, Emiel (graduation committee); Heemink, Arnold (graduation committee); Delft University of Technology (degree granting institution)","2019","In this work we set out to determine the impact, if any, of the analysis of news on stock price prediction, that is, are we able to predict stock movements more accurately on a consistent basis than a proposed baseline or random guessing on the basis of news’ text analysis. We considered a methodology to be more accurate if its success rate is greater than that of a baseline or random guess. We considered a methodology to be consistently more accurate if the average of the success rates over a specified number of runs, say one hundred, is greater than that of a baseline or random guess. As a result, we discovered that the analysis of news, though readily available with modern day technological advancements, does come paired with some problems. 1. The widespread availability of news has made it more difficult to find that news which is of importance to us, news can cover anything and everything. 2. The content of news can discuss events happening anywhere from far past to the far future, making consistent analysis difficult. 3. Most financial news sources tend to block any mass datamining attempts. These problems can mostly be solved by making use of so-called 8-K reports. These reports only cover major events of companies sorted into nine different categories. The 8-K reports reduce the time interval the news impacts from the far past and far future to an interval of five business days, as the reports ought to be published within four business days. Finally, since companies are obligated to publish these reports by the U.S. securities and exchange commission, the reports are readily available and easily accessible through the U.S. securities and exchange commission website. We can then use these texts and analyze them using a rule-based or automatic text analysis approach. However, the rule-based text approach, using lists of positive and negative words for the analysis, tends to be unreliable as text contains a plethora of challenging cases. This problem is solved by using an automatic text analysis, using predetermined scores for texts. The form of automatic text analysis used, is a decision tree approach. Though single decision trees we construct have the characteristic to over-fit, we can construct random forests of decision trees on subsets of our input data to solve this problem. For our analysis we looked at the stocks prices of Tesla, Microsoft, EA and Amazon, due to their varying values. We gave scores to the texts of the 8-K reports using the stock price movement of the day of publishing. We did this for up to 4 business days prior to publishing as well. We also compensated for the market movements using the variable for days zero to four. We gave scores from -1, 0 or 1 dependent on the price movement. This generally resulted in success rates greater than our considered baseline of 33.33% of random guessing. The highest success rate for Tesla, Microsoft, EA and Amazon were in order: 73.09%, 100.00%, 88.64%, 84.95%.","Impact Assessment; Finance; NEWS","en","bachelor thesis","","","","","","","","","","","","Applied Mathematics","",""
"uuid:320620e7-4e39-47b3-8cb0-c53c7aaa6755","http://resolver.tudelft.nl/uuid:320620e7-4e39-47b3-8cb0-c53c7aaa6755","Hydrological and hydrodynamic processes and their impact on spatial characteristics of Terminos Lagoon, Mexico","Dijkstra, Fokke (TU Delft Civil Engineering and Geosciences; TU Delft Geoscience and Remote Sensing); Jordans, Luuk (TU Delft Civil Engineering and Geosciences; TU Delft Hydraulic Engineering); Groenewegen, Maurits (TU Delft Civil Engineering and Geosciences; TU Delft Hydraulic Engineering); Steijlen, Florentine (TU Delft Civil Engineering and Geosciences; TU Delft Geo-engineering); Mekel, Charlotte (TU Delft Civil Engineering and Geosciences; TU Delft Water Management)","Morales Napoles, O. (mentor); Gebert, J. (mentor); van Overeem, J. (mentor); Delft University of Technology (degree granting institution)","2018","Terminos Lagoon is the biggest and ecologically most important fluvial-lagoon system of the southern Gulf of Mexico. Rivers, sea and meteorology all influence the lagoon, variable over the year, resulting in a complex situation. To protect this area, it is crucial to know how different hydrological processes, hydrodynamic processes and spatial characteristics influence each other in this context. Using a multidisciplinary approach, this research focused on the question: What is the influence of hydrological and hydrodynamic processes on spatial characteristics of Terminos Lagoon, now and in the future? The study has shown that evaporation has a larger part in the water balance during dry season, where during other seasons the water balance is similar to the annual mean. It is found that the western part of Terminos Lagoon shows different characteristics
than the eastern part, as river discharge plays a larger role in the western part of the lagoon. Secchi depth, temperature, dissolved oxygen, sediments and salinity are all different here compared to the eastern part of the lagoon. Salinity and river discharge, as well as air and water temperatures, show to be highly correlated. A tidal watershed divides the lagoon in two approximately equal areas, following the mentioned separation of east and west. Residual currents flow along the boundaries of the lagoon from east to west. A circular
residual current in the lagoon is observed near the Puerto Real inlet in created temperature and Secchi depth maps. Nortes season shows highest salinity and lowest Secchi depths, where dry season shows lowest salinity. Both inlets are expected to sedimentate and sediments outside the lagoon move westward. Climatological influences are uncertain, though likely effects are increased water temperature, salinity, flushing time and a decrease in residual current. Mentioned effects are likely most noticeable in the eastern part of the lagoon.
Further research is necessary to achieve ecological goals in the region.","Terminos Lagoon; Multidisciplinary project; Tropical lagoon; Eustuary system; Hydrological processes; hydrodynamical processes; spatial distribution; water parameters; Secchi depth","en","student report","","","","","","","","","","","","","Terminos Lagoon","18.5, -91.5"
"uuid:4a6a1f94-b7b2-4365-b51e-2fe3c0ad7429","http://resolver.tudelft.nl/uuid:4a6a1f94-b7b2-4365-b51e-2fe3c0ad7429","Predicting the added value of smart systems in a building: A decision model approach","Dijkstra, Niels (TU Delft Architecture and the Built Environment)","Arkesteijn, M.H. (mentor); de Graaf, R.P. (graduation committee); Leenders, L. (graduation committee); Binnekamp, R. (graduation committee); Delft University of Technology (degree granting institution)","2018","Purpose – One of the long-standing issues in the field of real estate management is the alignment of demand and supply. When building retrofit is initiated to comply with changing demands, the decision-maker has to deal with several, often competing, criteria. Smart systems have the potential to contribute to the process of optimally attuning the building with the changing demands, in other words, adding value to the building. To date, plenty of research exist on predicting the added value based on quantitative variables but fail to incorporate quantitative variables. The purpose of this paper is to provide a decision model that is capable of predicting the added value of smart systems in a building. It offers real estate managers a Preference Function Modelling (PFM) process, structure and model to approach a multi-criteria problem.
Design/methodology/approach – The PFM approach, an evaluation operational research methodology, is designed to help decision makers to choose the most preferred alternative from a set of already existing alternatives. A decision model is made in Excel that enables the construction of measurement scales to which linear algebra and calculus are applicable. A second research technique being used is the Lagrange curve. The model is tested on a single building in the portfolio of Schiphol Real Estate. Findings – The PFM model enables the decision-maker to establish a list of overall preferences scores of all relevant alternatives. The alternative with the highest overall preference score is predicted to add the most value to the building. The pilot study reveals that the procedure resulted in a result but a certain level of uncertainty exists. The cause of the uncertainty seems to be a lack of knowledge about the alternatives. Research limitations/implications – The Lagrange curve is a suitable technique for changing values of a variable. However, the curve tends to overshoot. Practical implications – The practical applicability depends on the selection of alternatives and knowledge available. If the alternatives are not known a priori, the PFM approach cannot be used and Preference Based Design (PBD) is more appropriate. If the knowledge available is low and difficult to improve the input is subject to uncertainty. The output may not project the actual situation. Originality/value – The research is based on the PAS approach from Arkesteijn et al. (2017). The PAS approach is a PBD methodology and is adapted to a PFM methodology in order to fit the intended purpose of the research. The PFM methodology takes both scaling and the Lagrange curve into account and along with an iterative procedure the decision-making process is well supported. The model provides a custom-made outcome, which is of high value for the decision-maker in the SHG case.","Smart building; Preference Function Modeling; Preference Measurement; IoT","en","master thesis","","","","","","","","","","","","Architecture, Urbanism and Building Sciences | Management in the Built Environment","",""
"uuid:11bd3b93-e47c-4eb7-8d2d-9b7a0dc34962","http://resolver.tudelft.nl/uuid:11bd3b93-e47c-4eb7-8d2d-9b7a0dc34962","Hands can: Determining the location and range of motion of digital joints in 3D scans","Dijkstra, Timo Johannes (TU Delft Industrial Design Engineering)","Geraedts, Jo (mentor); Wu, Jun (graduation committee); van der Zwan, Pieter (graduation committee); Delft University of Technology (degree granting institution)","2018","The versatility of the hands is revealed in its movements, but often not noticed before trauma occurs. Joint range of motion is used as a measure to follow the progress of diseases. A digital workflow for 3D data in medical appliances is envisioned for years.
The aim of this research is to develop a method that reliably and reproducability determine the range of motion of the digits. In current practice, the angles are measured using a goniometer. This method is very imprecise. Three methods to determine the location of joints in 3D hand scans can be distinguished: using heuristics, computer vision, and deep learning. Of those, deep learning is the most flexible, modern and accurate method and is therefore applied. The end result is a matrix containing the range of motion per joint and is applied to anatomically correctly manipulate a 3D model. For ease of manipulation, a physical manipulator is proposed. The results of this novel method show lower interrater differences than measurements with a goniometer.","Splint; 3D scan; Orthosis; Deep learning; 3D print; Arduino","en","master thesis","","","","","","","","","","","","Integrated Product Design | Medisign","Curatio",""
"uuid:676ec9ce-0bfe-45dc-94ce-af7f4d5aed97","http://resolver.tudelft.nl/uuid:676ec9ce-0bfe-45dc-94ce-af7f4d5aed97","Movement simulations on construction sites: An explorative study on the influence of 4D-BIM simulation of construction workers movements on construction sites to workhours and labour productivity","Dijkstra, Jan Tjerk (TU Delft Architecture and the Built Environment; TU Delft Management in the Built Environment)","Vrijhoef, Ruben (mentor); Koutamanis, Alexander (mentor); Delft University of Technology (degree granting institution)","2018","","Labour productivity; BIM; Dynamo; Walking path; Construction site; Construction Logistics","en","master thesis","","","","","","","","","","","","Architecture, Urbanism and Building Sciences","",""
"uuid:59531954-cdd4-4221-8f9b-99e15cec1756","http://resolver.tudelft.nl/uuid:59531954-cdd4-4221-8f9b-99e15cec1756","A future vision of Eindhoven Airbase: Giving growth a strategic direction towards 2050","Dijkstra, Ingeborg (TU Delft Industrial Design Engineering)","Mooij, Sylvia (mentor); Bluemink, Bart (mentor); de Pee, M. (mentor); Delft University of Technology (degree granting institution)","2018","This Master thesis is about a future vision of Eindhoven Airbase, where growth is given a strategic direction towards 2050. As a result, a strategic innovation roadmap and the detailed implementation of this is evaluated. Eindhoven Airbase is part of a complex decision-making system, where multiple stakeholders are involved. The research in this thesis provided insights about the wants and needs of the internal- and external stakeholders and shows relevant trends and developments concerning the (military) aviation context. The design challenge is formulated as follows: “How can Eindhoven Airbase create sustainable operations towards 2050?”. This design challenge is tackled by the Vision in Product Design approach (Hekkert & van Dijk, 2011), where a context vision for Eindhoven Airbase in 2050 is created. The context vision resulted in a concept, containing three specific recommendations for Eindhoven Airbase and two external stakeholders, namely Eindhoven Airport and Eindhoven city. These recommendations (i.e. centred coordination, a specified circular economy and joint innovation team) are included in the strategic innovation roadmap.","Strategic Design; Strategic Innovation Roadmap; Vision in Product Design; Sustainable operations; Royal Netherlands Air Force; Eindhoven Airbase; Eindhoven Airport; Context vision 2050","en","master thesis","","","","","","","Campus only","","","","","Strategic Product Design","",""
"uuid:55e8d679-b8c1-47ab-9376-90598857c825","http://resolver.tudelft.nl/uuid:55e8d679-b8c1-47ab-9376-90598857c825","Connecting the dots, high field ballistic supercurrents","Dijkstra, Hidde (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft Applied Sciences)","Akhmerov, Anton (mentor); Bierkens, Joris (mentor); Delft University of Technology (degree granting institution)","2018","We study the flow of supercurrents between two superconducting contacts connected by a 2d layer of graphene. We use a Markov chain Monte Carlo method to find Andreev bound states for circular electron trajectories. Using sample trajectories we estimate the currents as function of the superconducting phase difference between the contacts and the magnetic field.
This research focusses on exploring the different possibilities for integrating blockchain technology in the real estate management process. By analyzing the current real estate management process and gaining knowledge about the implementation of blockchain technology, the objective of this research is exploring in which phases of the real estate management process the process can benefit from the use of blockchain technology.
The research findings contribute to the knowledge of opportunities for broad implementation of blockchain technology in the real estate management process by providing a scientific based research document. It provides a broad overview of different opportunities and constraints for using blockchain technology in the process. It increases awareness for the disruption this technology might bring. This research provides scientific arguments for possibilities of implementing blockchain technology in the real estate management process and will function as a trigger for continuation of research into this topic.
The responsive animations concept guides passengers in taking the correct posture inside the Security Scanner. Real time skeletal tracking is done, whereafter the appropriate instructions and corrections are displayed. This concept aims to replace the instructive tasks of the agents to lighten their workload, and to defuse the tensions between passenger and agent.
Prototyping tests were executed in a live security operation to assess the effectiveness of the design and to record the agents’ experiences. Agents found the concept to work de-escalating because it acted as a mediator between passenger and agents. Moreover, they noticed a significant decrease in repetitive workload improving their overall mood and resilience.","interaction design; design; Schiphol; security; responsive animations; protoyping; use cues; usability design","en","master thesis","","","","","","","Campus only","2018-07-07","","","","","",""
"uuid:9d82e70b-6086-43c7-8672-597e29a1f6e4","http://resolver.tudelft.nl/uuid:9d82e70b-6086-43c7-8672-597e29a1f6e4","A revision of the Security Scanner: Restoring the balance between passenger, agent and Scanner","Dijkstra, Jorn (TU Delft Industrial Design Engineering)","van Egmond, Rene (mentor); Price, Rebecca (mentor); Staal, Jurgen (mentor); Delft University of Technology (degree granting institution)","2017","Using Schiphol’s Security Scanner is confusing for a lot of passengers. Therefore, security agents currently have to fully take on the task of guiding the passenger through the Scanner. This repetitive task in the high volume environment of Schiphol security leads to physical and mental exhaustion and results in frustration, which is projected onto passengers.
The responsive animations concept guides passengers in taking the correct posture inside the security scanner. Real time skeletal tracking is done, whereafter the appropriate instructions and corrections are displayed. This concept aims to replace the instructive tasks of the agents to lighten their workload, and to defuse the tensions between passenger and agent.
Prototyping tests were executed in a live security operation to assess the effectiveness of the design and to record the agents’ experiences. Agents found the concept to work de-escalating because it acted as a mediator between passenger and agents. Moreover, they noticed a significant decrease in repetitive workload improving their overall mood and resilience.","Schiphol; Security; Scanner; Design for Interaction; Interaction Design; Design for Usability; Usability; Usability Design; Airport security; User testing; Live testing","en","master thesis","","","","","","","Campus only","","","","","Design for Interaction","",""
"uuid:f425d407-21ec-4a2c-97e4-e5e4252daeee","http://resolver.tudelft.nl/uuid:f425d407-21ec-4a2c-97e4-e5e4252daeee","Regions: Administrative level or void?: Case study on the emergence and implementation of regional arrangements on housing provision after Wgr-plus","Dijkstra, W.","Korthals Altes, W.K. (mentor); Groetelaers, D.A. (mentor); de Bruijne, M.L.C. (mentor); Zoete, J.A. (mentor)","2017","","regional governance; housing provision; administrative void; provinces; municipalities; Netherlands","en","master thesis","","","","","","","","2017-05-03","Technology, Policy and Management","OTB","","Systems Engineering, Policy Analysis & Management (SEPAM)","",""
"uuid:748029ec-1509-4f33-9021-8773f08c10c2","http://resolver.tudelft.nl/uuid:748029ec-1509-4f33-9021-8773f08c10c2","De integratie van openbaar vervoer en doelgroepenvervoer in landelijke gebieden in Nederland: Een algemeen toepasbaar evaluatiemodel en case studie in Noord-Limburg","Dijkstra, J.","van Arem, B. (mentor); van Nes, R. (mentor); Annema, J.A. (mentor); Blanker, F. (mentor)","2017","","doelgroepenvervoer; community transport; paratransit; collectief vervoer; Flexnet; collectief vraagafhankelijk vervoer (CVV); flexible transport system; dial-a-ride","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Transport & Planning","","","",""
"uuid:787fc710-52d0-4de6-9669-c2de10ba8018","http://resolver.tudelft.nl/uuid:787fc710-52d0-4de6-9669-c2de10ba8018","Zakkende grond op ankers","Dijkstra, S.D.","Jonkman, S.N. (mentor); Bakker, K.J. (mentor); Abspoel, R. (mentor); Meinhardt, G. (mentor); Larsen, H. (mentor); De Gijt, J.G. (mentor); Van Schaik, C.N. (mentor)","2015","The graduation thesis focuses on providing insight in the consequences of subsiding ground on soil anchors. With the years, the bars of an anchored sheet pile walls for example, can be unfavourably loaded due to subsiding soil. As a result of these lateral loads, the bar will deform and elongate, causing the stresses to increase. The applicability of the current design method of CUR 166 is limited. Hereby referring to using it for determining the deformation of anchors in common situations, such as inclined anchors crossing multiple layers of soil. Because of the ambiguities and limitations of this method, the report will verify and modify the design method of CUR 166. While looking at the issues regarding subsiding soil, distinction will be made between the soil behaviour around the anchor and the way in which the anchor bar deforms due to the soil load. As a way of gaining insight in the consequences of subsiding soil on anchors, Deltares has conducted model tests on small sized bars and measured the resulting loads. By simulating these tests with Plaxis 2D has the way subsiding soil loads the bars been defined. In contrast to the current method of CUR 166, the value of the shear strength should depend on the drained or undrained behavior of the soil. The result is an almost constant value for the factor to determine the load with, this in contrast to the currently used variable / unclear factor. The subsidence process loads the anchor laterally and causes it to deform. A new design method (vernieuwde rekenmethode) has been created in order to approximate the deformation and stress–strain curve of the anchor with along the free anchor length. This method is applicable for a wide range of situations, including the loading of inclined anchors crossing multiple layers of soil. The current method uses an elastic calculation to verify the stresses with the regulations. The possibilities of using a plastic calculation have been researched. Due to the displacement controlled nature of subsiding soil loading the bar, can the bending moments be absorbed by the yielding of the bar. As long as the curve of the yielding anchor bar is not obstructed by supports, the rotational capacity of the anchor will be sufficiently large to allow for yielding of the steel. In Plaxis 2D and 3D has the applicability of an embedded pile as an anchorage been researched in order to verify it with the vernieuwde rekenmethode. When comparing the different methods, it can be concluded that the resulting increase in axial anchor force due to subsiding soil, defined with the CUR 166, is conservative compared to the Plaxis simulation and the vernieuwde rekenmethode.","CUR 166; ankers; grond; zetting; embedded pile element; Plaxis 2D; Plaxis 3D","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:79beac8c-655c-4220-8e87-850ffb7989eb","http://resolver.tudelft.nl/uuid:79beac8c-655c-4220-8e87-850ffb7989eb","Rotor noise and aero-acoustic optimization of wind turbine airfoils","Dijkstra, Pieter (TU Delft Applied Sciences)","Timmer, W.A. (mentor); van Bussel, G.J.W. (graduation committee); Ragni, D. (graduation committee); van Oudheusden, B.W. (graduation committee); Delft University of Technology (degree granting institution)","2015","The thesis is focused on designing a tip-region airfoil for a multi-MW wind turbine. It is approached with the objective of optimizing the geometry of the airfoil for the best trade-off between aero-acoustics and aerodynamic requirements. Using the wind turbine noise prediction tool SILANT it is established that trailing edge noise is the most dominant noise source. Reduction of airfoil self-noise should therefore focus on this noise mechanism. A modified version of the semi-empirical aero-acoustic prediction code by Brooks, Pope and Marcolini is used to compute this trailing edge noise. The panel code RFOIL is used for the boundary layer computations as well as the generation of the aerodynamic polars. A quality assessment of both codes is performed based on aerodynamic and acoustic wind tunnel measurements acquired by the Institut für Aerodynamik und Gasdynamik on the NACA 643-418 airfoil. The multi-objective optimization is executed using the genetic algorithm NSGA-II. The airfoil parameterization that is used is the Class Shape Transformation (CST) method by Kulfan. The results of the optimization are captured in the Pareto front and six individuals are assessed thoroughly. It is found that airfoils can be designed that fulfill all the aerodynamic requirements. Acoustically, only marginal differences can be observed and further research should be conducted on the topic.","Windenergy","en","master thesis","","","","","","","","","","","","Electrical Engineering | Sustainable Energy Technology","",""
"uuid:62da2df1-6b08-41fb-b979-03d4f3f19245","http://resolver.tudelft.nl/uuid:62da2df1-6b08-41fb-b979-03d4f3f19245","EventHUB: A self-sustaining and relocatable pavilion for events","Dijkstra, A.M.","Smit, M.J. (mentor); Broersma, S. (mentor); Meijs, M.H. (mentor)","2015","For the design of the EventHUB a research was done on the possibilities for renewable onsite power production for temporary outdoor events. The research concluded that flexible PV cells were an interesting possibility and were here for used as starting point for the architectural design. During the design process the integration of the PV cells in an architectural way and smartly configuring and limiting the amount of freight transport needed were taken into account to reduce the carbon footprint of outdoor events. Furthermore, by creating the possibility for a multifunctional programme in the pavilion its flexibility and lifespan is extended.","sustainable; sustainability; relocatable; temporary; ephemeral; moving; flexible; outdoor; transportable; architecture; events; pavilion; festival; multifunctional; PV cell; solar panel; multifunctional","en","master thesis","","","","","","","","","Architecture and The Built Environment","Architectural Engineering and Technology","","Architectural Engineering Graduation Studio","",""
"uuid:d4dba2bf-4a98-45b1-a2e1-78fb345fc8ee","http://resolver.tudelft.nl/uuid:d4dba2bf-4a98-45b1-a2e1-78fb345fc8ee","On the effect of tidal variations of turbulent mixing on flow and salt transport in estuaries","Dijkstra, Y.M.","Schuttelaars, H.M. (mentor)","2014","The intrusion of sea water into estuaries creates a complex flow that results from the density difference between fresh river run-off and salty sea water. In combination with other processes, such as tides, these complex flows are of interest because they affect the transport of e.g. salt, sediments and nutrients in water, which determine the future shape and ecology of the estuary. This research focusses on mechanisms that result in exchange flows and transport of salt. The model study has led to new insights into the way in which tides and baroclinic pressure gradients contribute to the straining circulation, i.e. the exchange flow that is induced by the interaction of temporal variations of turbulence and velocity. The straining circulation is traditionally associated with the tidal flow. To make a distinction between this traditional view and the new findings, we will call this the {\em tidal straining circulation}. It is shown that the tidal straining circulation explains only a small part of the total straining circulation in a parameter space typical for well-mixed and partially stratified estuaries. This research identifies a new and more important contribution to the straining circulation. This is caused by interactions between the gravitational circulation and temporal variations of turbulent mixing, which we will call the {\em gravitational straining circulation}. The gravitational straining circulation increases non-linearly with increasing temporal variations of turbulence. Large tidal variations of turbulent mixing are typically found in well-mixed and partially stratified estuaries. Such temporal variations of turbulence can be caused by strain-induced periodic stratification (SIPS), asymmetric mixing or symmetric variations of mixing, such as the variation of turbulence with the tide. The dominant contribution of gravitational straining circulation to the total straining circulation explains why the straining circulation is larger than the gravitational circulation in partially stratified estuaries and why both the gravitational circulation and the straining circulation have the same dependency on the along-channel salinity gradient. It also explains why the straining circulation is much smaller in strongly stratified estuaries, where the tidal variations of turbulence are not as large as in partially stratified estuaries. The direction and magnitude of the gravitational straining circulation is additionally shown to be independent of the timing of temporal variations of turbulent mixing. The magnitude and direction of the tidal straining circulation depend not only on the timing of temporal variations of mixing, but are shown to also depend on the bed roughness and the rate of mixing. This implies that the tidal straining circulation can act in the opposite direction as is expected from current theory in certain model parametrisations. Concerning the transport of salt, it is shown that temporal variations of turbulent mixing are able to create a strong salt transport. A potentially large salt transport is caused by temporal correlations of the salinity and the velocity. This salt transport contribution is shown to be highly sensitive to the phase of the salinity, which is strongly dependent on the phase of turbulent mixing. Accurate modelling of turbulence is therefore essential to obtaining accurate results for the salinity.","estuary; exchange flow; salt intrusion; perturbation model; turbulence modelling; estuarine circulation; straining circulation","en","master thesis","","","","","","","","2015-11-14","Electrical Engineering, Mathematics and Computer Science","Mathematical Physics","","Applied Mathematics","",""
"uuid:251b4a5a-2823-4a2b-aa4a-1a2f52bc9272","http://resolver.tudelft.nl/uuid:251b4a5a-2823-4a2b-aa4a-1a2f52bc9272","Turbulence modelling in environmental flows: Improving the numerical accuracy of the k-epsilon model by a mathematical transformation","Dijkstra, Y.M.","Pietrzak, J.D. (mentor); Schuttelaars, H.M. (mentor); Uittenbogaard, R.E. (mentor); Van Kester, J.A.T.M. (mentor)","2014","Numerical modelling for environmental flow applications, such as for rivers, lakes, estuaries and coastal flows, faces a trade-off between the numerical accuracy and the required computation time. This trade-off results in grids which typically contain 10 to 100 layers in the vertical direction. Such a grid resolution poses severe limitations to the numerical accuracy of the model. The turbulence model determines a significant part of this accuracy. This research therefore investigates an unexplored method of using transformations to improve the numerical accuracy of two-equation turbulence models at a low resolution. The k-epsilon model is used as starting point for this method. The equation for epsilon is transformed to equations for omega and tau. This results in three turbulence models, the k-epsilon, k-omega and k-tau models, which are physically equivalent, but possess different numerical properties. This research identifies these different numerical properties in order to explain when and why a certain transformation is beneficial to the numerical accuracy. The three turbulence models are tested in six cases of homogeneous and stratified flows in a one-dimensional vertical (1DV) numerical model, which is representative for the implementation in the 3D simulation system Delft 3D-FLOW. It is shown that the k-tau model yields more accurate results than the k-epsilon and k-omega models in boundary friction dominated flows, such as those found in rivers, partially stratified estuaries and along the coast. This improved performance is explained from the profile of tau, which is linear near the frictional boundary and therefore accurately approximated on a low resolution grid. The profiles of epsilon and omega are hyperbolic near the frictional boundary and therefore not accurately represented on such a grid. The boundary condition for tau is well-posed, while no natural boundary conditions for epsilon and omega exist. Dirichlet boundary conditions for epsilon and omega are therefore inaccurate. The Neumann boundary condition is found to be the most accurate alternative boundary condition for epsilon and omega. An adjusted Dirichlet conditions used in Delft 3D-FLOW improves on the result of the ordinary Dirchlet condition, but shows bad convergence behaviour, with results being significantly worse at 100 vertical layers than at 10 vertical layers. A new adjusted Dirichlet condition is developed, which has better convergence behaviour, but is still somewhat worse than the Neumann condition. The k-tau and k-omega models contain a number of diffusive terms, the implementation of which may introduce numerical diffusion in the model. Some of these diffusive terms are essential to the stability of the model. Others are optional. It is argued that the choice whether or not to include such optional diffusive terms should be based on both physical and numerical arguments, because the numerical diffusion associated with the implementation of the terms may have a significant desired or undesired effects on the model results. It is found in the cases in this research that convergence of the turbulence models with increasing grid resolution is typically found between 100 and 1000 grid cells in the vertical direction. One case of temperature modelling of a lake has been tested in which convergence did not occur up to 2000 grid cells. So converged results are generally beyond the range of generally used vertical resolution in 3D models. Within the feasible range of 10 to 100 layers it is found that the results of the turbulence models do not necessarily become more accurate if higher resolution grids are used. So monotonous convergence of the turbulence models is not guaranteed.","turbulence modelling; numerical accuracy; stratification; k-epsilon model; k-tau model; convergence","en","master thesis","","","","","","","","2015-11-06","Civil Engineering and Geosciences","Hydraulic Engineering","","Environmental Fluid Mechanics","",""
"uuid:4feffb3f-97d2-478a-bae2-5c1648dc09e2","http://resolver.tudelft.nl/uuid:4feffb3f-97d2-478a-bae2-5c1648dc09e2","Een op risico gebaseerde methode om de efficiëntie en effectiviteit van Conventionele Explosieven onderzoeken van RWS projecten te verbeteren","Dijkstra, M.","Van der Horst, A.Q.C. (mentor); Van Gulijk, C. (mentor); Hombergen, L.P.I.M. (mentor); Doppenberg, T. (mentor)","2013","","","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Structural Engineering","","Construction Management and Engineering","",""
"uuid:3b25b98c-e9d4-48e8-a00f-1970df0eefc7","http://resolver.tudelft.nl/uuid:3b25b98c-e9d4-48e8-a00f-1970df0eefc7","Van Industrie gebied naar Artpark - De transformatie van het voormalig kortsluitlaboratorium van de KEMA Arnhem tot een Filmtheater","Dijkstra, R.","Meijers, W.L.E.C. (mentor); Koopman, F.W.A. (mentor)","2013","Afstudeerpresentatie, ontwerpbeschrijving en reflectie/afstudeerrapport van Rikst Dijkstra. Over het transformeren van een voormalig kortsluitlaboratorium van de KEMA te Arnhem naar een Filmtheater","filmtheater; transformatie; herbestemming; artpark; Arnhem; Arnhems Buiten; bouwen aan spoor","nl","master thesis","","","","","","","","2013-01-29","Architecture","RMIT","","","",""
"uuid:94e43177-847e-47b6-bfc5-fe8b5bc66d70","http://resolver.tudelft.nl/uuid:94e43177-847e-47b6-bfc5-fe8b5bc66d70","Design of a knock down city bike","Dijkstra, J.A.","Tempelman, E. (mentor); De Geer, S.G. (mentor); Niellissen, J.P. (mentor); Smit, S. (mentor)","2010","The graduation assignment as supplied by VANMOOF was defined as follows: Design and develop a knock down city bike for the Dutch market. Investigate how to lower the costs by optimizing the supply chain and the production methods. Investigate the possibilities of a new VANMOOF standardized parts in order to design easy and reliable assembly connections.","bike; assemble; city; VANMOOF","nl","master thesis","","","","","","","Campus only","2011-11-15","Industrial Design Engineering","Design Engineering","","Master of Science Integrated Product Design","",""
"uuid:15eacd3f-feb1-462b-a78b-d042005df442","http://resolver.tudelft.nl/uuid:15eacd3f-feb1-462b-a78b-d042005df442","Mapping and reducing CO2 emissions at Amsterdam Airport Schiphol: Developing a model to assess CO2 reduction at Amsterdam Airport Schiphol","Dijkstra, A.","Verbraeck, A. (mentor); Kortmann, L.J. (mentor); Welink, J.H. (mentor)","2010","Global warming as a result of human actions is a serious and growing concern for people all over the world and consequently also for the passengers of Amsterdam Airport Schiphol (AAS). Although speed and efficiency remain the basis of the operations of AAS, Schiphol Group realizes a 'green airporf is an attractive proposition for the modern passenger. Therefore Schiphol Group wants to take its responsibility in tackling the problem of the climate change with a first focus on reducing its CO2 emissions.","","en","master thesis","","","","","","","","","Delft University of Technology","Transport, Infrastructure and Logistics","","TIL","",""
"uuid:d11f7dc2-01e3-4257-ad86-ae9f552c38a6","http://resolver.tudelft.nl/uuid:d11f7dc2-01e3-4257-ad86-ae9f552c38a6","City branding: A new start for Dutch city centres?: A research of attractiveness by the cities Hoorn and Roermond.","Dijkstra, R.","Kooijman, D. (mentor); Hulsbergen, E.D. (mentor); Serbruyns, H.M.M. (mentor)","2010","City branding is one of the new marketing strategies for cities. Citybranding is a comprehensive phenomenon with the main goal of setting out the city with a brand; to profile the city with an identity. The objective of this research is to investigate the phenomenon city branding and to clarify if city branding gives the city a new impulse of attractiveness. This investigation is tested on two cities, Roermond and Hoorn. The research question is: “Does citybranding offer medium-sized city centres new impulses of attractiveness?”","Citybranding; Attractiveness; Identity","en","master thesis","","","","","","","","","Architecture","Real Estate & Housing","","","",""
"uuid:50e95ac8-47a6-4f0f-b844-95b8686923c0","http://resolver.tudelft.nl/uuid:50e95ac8-47a6-4f0f-b844-95b8686923c0","High-Rise, Exploring the ultimate limits","Dijkstra, A.J.","Vambersky, J.N.J.A. (mentor); Terwel, K.C. (mentor); Luscuere, P.C. (mentor); Kaan, C.H.C.F. (mentor); Middelkoop, F.H. (mentor)","2008","In 1885 the race for the skies was initiated with the construction of the Home Insurance Building in Chicago, world’s first true skyscraper. Since the turn of the 1990’s, Asian countries have started to get involved as well in the race for the skies and have even become the leading contestants of today. Driven by their fast economic growth these contestants want to promote their country and its cities by constructing ever taller skyscrapers. An example of this is the Burj Dubai. With a height well over 800 metres, it will become world’s tallest skyscraper. But, how long can this race for the skies continue? Will we eventually encounter insuperable difficulties which will bring the race to a close? This brings us to the goal of this thesis: ""To gain a good insight into the challenges which will be encountered when designing and constructing an ultra-tall skyscraper, with the aim to find the ultimate limit to the height of the skyscraper."" The thesis’ goal consists of two parts; in the first part of the thesis a clear understanding of the subject is obtained by carefully examining the encountered challenges. In the second part, this knowledge is used to explore the limits to high-rise. A list of 14 challenges is examined. These challenges vary from structural and serviceability challenges to safety and economical challenges. From this list, six challenges are selected which are examined more carefully: the building’s foundation, the skyscraper’s load-bearing structure, the comfort criterion, the vertical transportation of people, goods and building services, evacuating the building’s occupants and the economical feasibility of the skyscraper. First, the limits to each of these challenges are determined by taking into account the Dutch building codes. Secondly, it is examined which measures can be taken to further stretch these limits. These possible measures can be depicted in a web diagram. From this diagram can be noted that one single measure can simultaneously stretch the limit of several challenges. From the diagram follows as well that changing the shape of the skyscraper is one of the most promising measures to stretch the height of the building. Three different options for changing the shape of the skyscraper are examined in the thesis: change the footprint of the building, give the building a tapering shape or create a compound structure, which means that multiple slender towers are interconnected to form one structural entity. After examining these three options it can be concluded that compound structures are the most promising solution if we want to build ultra-tall skyscrapers in the near future. Compound structures perform well all along the line. In the thesis all of the building’s boundary conditions are determined on beforehand. Based on these assumptions the skyscraper’s limits are established. As a result of this, no absolute limit to high-rise can be found. This master’s thesis can be a starting point for future master’s theses. When one wants to further explore the limits to high-rise, it is advised to apply a different approach. The height of the skyscraper should be predetermined. Based on this target one can deduce which structure is needed to achieve this height and which concessions have to be made with regard to the building’s serviceability and safety.","","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Design and Construction","","","",""
"uuid:a1848eea-754e-4e8e-8dd9-f592d385d8bc","http://resolver.tudelft.nl/uuid:a1848eea-754e-4e8e-8dd9-f592d385d8bc","Armour layer stability on a bermed slope breakwater","Dijkstra, O.P.J.","Stive, M.J.F. (mentor); Verhagen, H.J. (mentor); Uijttewaal, W.S.J. (mentor); Spaan, G.B.H. (mentor); Van Gent, M.R.A. (mentor); Van Oord (contributor)","2008","In coastal regions where the land is sensitive to erosion, but also for harbours and ports, numerous types of defensive structures have been developed to protect it from the effects of incident waves. More recently breakwaters have been constructed which combine the stability characteristics of a conventional two-layered uniform sloped breakwater with the wave energy dispersive character of a berm breakwater. This type is referred to as a 'breakwater with a bermed slope' or a 'bermed sloped breakwater' In order to develop more insight in the development of damage on bermed sloped breakwaters, small-scale experiments have been performed in which the two most important parameters related to a berm were tested. These governing parameters were the relative berm length and the relative water level with a range of respectively 0.00 < B/Lm-1,0 < 0.35 and -0.8 < Rc/Hm0 < 0.7. It is concluded that the development of damage on a bermed slope has a similar, but more stable, trajectory as predicted for a uniform slope with the stability formula of Van Gent (2003). The increase in stability can be indicated with a constant factor rD. Also the damage level parameters for 'start of damage' and 'failure' on a bermed slope are independent of the governing parameters and correspond to the values of a uniform sloped breakwater. The influence of the governing parameters on the stability of the lower slope for 'start of damage' is shown in Figure 1. Conceivable trendlines are drawn for constant values of Rc/Hm0 and B/Lm-1,0. It can be concluded that when regarding constant values of Rc/Hm0 the test results show, for initial values of the relative berm length, an increase in stability as B/Lm-1,0 increases. As the relative berm length gets increasingly larger, the increase in stability indicates a horizontal limit. Also the range for which the relative berm length has a positive contribution on the increase in stability is strongly related to the relative water level. For Rc/Hm0 < 0 this range is small but it widens quickly as the water level approaches the berm level. As the water level on the berm increases, it gradually becomes smaller again. A research by WL|Delft Hydraulics (Vermeer (1986)), which performed similar tests but for Rc/Hm0 > 0.9, showed different results. The development of the increase in stability for constant values of the relative berm length showed a peak at B/L0 = 0.15. This peak seemed to flatten out as the water level on the berm became smaller. This process could possible link the findings of this study to the findings of Vermeer (1986), however, more research has to be done to confirm this hypothesis. Finally the two design principles, which in practice are used as indication of the increase in stability, were validated with the results of this study. The first principle applies stability formulae for uniform slopes on the average slope of a bermed profile. The second principle adopts the characteristics of low-crested structures on the bermed profile. The correlation between the predicted increase in stability and the results of the test series was very low. Apparently the complexity of the processes related to the (in)stability of armour layers on a bermed slope can not be overcome by means of the design principles. This is most probably caused by the influence of the return current, which has large impact on the stability, is not accounted for. Therefore both principles are not well suited to predict the increase in stability of armour layers on bermed slopes.","breakwater; berm; armour; layer; stability","en","master thesis","TU Delft, Civil Engineering and Geosciences, Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:1549b737-87d5-45b8-9dc0-ecbe446fe4a0","http://resolver.tudelft.nl/uuid:1549b737-87d5-45b8-9dc0-ecbe446fe4a0","Transformatie voormalig Noorderpershuis te Antwerpen","Dijkstra, W.","","2008","Met als bijlage: A0 poster","","nl","master thesis","TU Delft, Architecture, Architecture","","","","","","","","Architecture","","","","",""
"uuid:868f4360-4ec3-41ce-b889-b43958f591da","http://resolver.tudelft.nl/uuid:868f4360-4ec3-41ce-b889-b43958f591da","Fieldwork Coastal Engineering: Varna (Bulgaria)","Bosman, G.; Dijkstra, O.; Gilding, C.; Van der Hoeven, T.; Langedijk, J.; Trung, L.H.; Louwersheimer, W.F.; Maaskant, B.; Van der Sande, M.; De Waal, R.J.; De Wit, A.; Zweers, S.","","2005","For the course CT5318 a trip is made to Varna, Bulgaria, where hydraulic measurement s on the beach and the coastal structures are executed by the students. This report describes the measured data, the used methods and the technical interpretation of the results. All the data was processed in Varna and analysed once returned in the Netherlands. This coastal engineering fieldwork is organised every year with a main goal to expose student to the problems, which concern all the aspects of a field survey. The group stayed the whole week in St . Constantine, where is a village situated at t he Black Sea coast just north of Varna in Bulgaria. St . Constantine is a booming tourist place and a lot of luxurious hotels were recently built in the surrounding of the beach. Some of t hem are act ually build on the beach. To protect the beautiful beaches and keep them as wide as possible for the tourists some hydraulic structures are built. There were beach measurements executed on the beach of St .Constantine and on a beach just North of Varna. The beach of St .Constantine was also investigated last year but the beach just North of Varna was investigated for the first t ime in a fieldwork. This was done because a Dutch contractor is interested in t e possibilities for sand nourishment at this beach.","fieldwork; Varna; Bulgaria; CT5318","en","student report","TU Delft, Department Hydraulic Engineering","","","","","","Campus only","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:2c7bb9f1-4d68-4c5d-9720-4444b98820cc","http://resolver.tudelft.nl/uuid:2c7bb9f1-4d68-4c5d-9720-4444b98820cc","The influence of vegetation on scroll bar development","Dijkstra, J.T.","de Vriend, H.J. (mentor); Van Beek, E. (mentor); Mosselman, E. (mentor); Van den Berg, J. (mentor); Baptist, M. (mentor)","2003","","","en","master thesis","TU Delft, Faculty of Civil Engineering and Geosciences, Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:04de0a10-773e-4dc4-9c25-3e41982b35fa","http://resolver.tudelft.nl/uuid:04de0a10-773e-4dc4-9c25-3e41982b35fa","Tweebaksduwvaart op het Prinses Margrietkanaal","Dijkstra, R.J.","Velsink, H. (mentor); Bouwmeester, J. (mentor)","1988","Het Prinses Margrietkanaal is in de huidige situatie een klasse IV kanaal. Men is momenteel bezig met het opwaarderen van dit kanaal tot klasse V kanaal. Dit gebeurt door tijdens periodiek onderhoud extra baggerwerk uit te voeren. Er zijn dan ook een achttal alternatieven ontworpen voor een klasse V kanaal die als basis voor het ontwerp van een duwvaart kanaal dienen. Uit het onderzoek blijkt dat de onderhoudsdiepte voor een klasse V kanaal vergroot zal moeten worden van 3.50 + K.P. naar 3.80 + K.P. De kanaalbreedte zal ook iets vergroot dienen te worden tot ongeveer 60.0 m. Hierbij wordt er steeds uitgegaan van een gebroken trapeziumvormig profiel. Bij een bakprofiel kan de breedte geringer zijn. Echter door de bij dit profiel benodigde vertikale damwanden treedt een hinderlijke golfslag op waarvan met name de pleziervaart veel hinder ondervindt. Op plaatsen waar de verbreding naar 60.0 m. niet mogelijk is zal het kanaal extra verdiept moeten worden. Een alternatief is het toe passen van een bakprofiel op plaatsen waar verbreding niet mogelijk is.","Prinses Margrietkanaal; duwvaart kanaal; bakprofiel","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:35ba8607-93fa-4b36-a6ff-bd15a8e17af9","http://resolver.tudelft.nl/uuid:35ba8607-93fa-4b36-a6ff-bd15a8e17af9","Een aarden dam in Rio Cuisalá","Dijkstra, G.","Glerum, A. (mentor); Bourguignon, G.P. (mentor); Tutuarima, W.H. (mentor)","1986","In Nicarugu kampt men met grote drinkwaterproblemen. Tijdens een voorstudie in 1984 is de drinkwatersituatie geinventariseerd. In dit afstudeerwerk wordt een studie gedaan naar wateropslagalternatieven, een geschikte damlocatie en ontwerpcriteria voor een aarden dam, alsmede een beschouwing van enkele ontwerpaspecten van een gekozen gabondam-oplossing voor een drinkwaterreservoir in de rivier Rio Cuisalá, Nicaragua.","Rio Cuisalá; aarden dam; wateropslag; drinkwaterreservoir","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:18e675c7-871d-4796-97e5-dbd1251a745f","http://resolver.tudelft.nl/uuid:18e675c7-871d-4796-97e5-dbd1251a745f","Ontwerp van een overlaat","Dijkstra, T.","Glerum, A. (mentor); Schippers, J. (mentor)","1985","Dit rapport is de weergave van een ontwerpproces van een overlaat. Stap voor stap is gekomen tot een goed ontwerp van die overlaat. De overlaat is opgenomen in een dam rond een reservoir en dient om de waterstanden in het reservoir te beheersen en om een teveel aan water in de regentijd te lozen op de rivier. Deze rivier is de Hadejia River in Noord-Nigeria (zie'figuur 2). Langs deze rivier is een irrigatieproject ontworpen (zie figuur 4); de bouw van de overlaat is een deel van dit project. Over Nigeria en het Hadejia Valley Project is geschreven in hoofdstuk 2. In hoofdstuk 3 zijn alle mogelijke alternatieve overlaten beschreven en afgewogen. De keuze valt dan op een regelbare overlaat, waarna in hoofdstuk 4 twee alternatieve regelbare overlaten nader zijn uitgewerkt om tot een keuze tussen deze twee varianten te komen. Het ene alternatief betreft een brede regelbare overlaat met een kleine overstorthoogte en het andere alternatief is een stuk kortere regelbare overlaat met een grotere overstorthoogte. Het blijkt dat de besparing aan beton en staal van de kortere variant teniet gedaan wordt door een zwaardere woelbakconstructie. De keuze valt dan toch op de brede overlaat vooral omdat tijdens de bouw- en gebruiksfase de voorkeur uitgaat naar deze variant (zie tabel 10 en 11,.pagina 68 en 69). In hoofdstuk 5 zijn tenslotte nog enige detailberekeningen uitgevoerd van de gekozen variant.","overlaat; Hadejia River; irrigatieproject; woelbakconstructie","nl","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:25bb3345-4077-46a2-b532-3cbc56fae6de","http://resolver.tudelft.nl/uuid:25bb3345-4077-46a2-b532-3cbc56fae6de","Toestandsvergelijkingen voor polymeren","Dijkstra, H.","te Nijenhuis, F.K. (mentor)","1971","Voor vloeistoffen -zowel monomere als polymere- is het opstellen van een theorie die nauwkeurige resultaten geeft voor onder andere de toestandsvergelijking (p,V,T-vergelijking) een nog groter probleem dan voor vaste stoffen (kristallijn) of gassen (ver boven het kritisch punt). Enerzijds heeft men te maken met een systeem dat ongeordend is en anderzijds een hoge dichtheid heeft, waardoor men het ""veel deeltjes probleem"" principieel niet kan benaderen door alleen paar-interacties te beschouwen. Pogingen om een zo exact mogelijke theorie op te stellen hebben doorgaans als resultaat een zeer ingewikkelde toestandsvergelijking, terwijl juist goede hanteerbaarheid een wenselijke eigenschap is. In deze scriptie zal onder andere een overzicht worden gegeven van in de literatuur voorgestelde toestandsvergelijkingen voor polymeren. Zij vallen globaal uiteen in drie groepen: l) toestandsvergelijkingen oorspronkelijk opgesteld voor monomere vloeistoffen, die direct worden toegepast op polymeren of modificaties van deze modellen voor polymeren; 2) theorieen die direct uitgaan van ketenmolekulen en 3) een aantal zuiver empirische relaties.","","nl","student report","","","","","","","","","Applied Sciences","","","","",""
"uuid:82fb3f01-bc3b-4cde-a6c2-36ecd1f8d41d","http://resolver.tudelft.nl/uuid:82fb3f01-bc3b-4cde-a6c2-36ecd1f8d41d","Hydrodynamika van niet-isotherme-laminaire stromingen met temperatuursafhankelijke viskositeit, in ronde pijpen en tussen evenwijdige platen","Dijkstra, F.C.","","1970","","","nl","master thesis","","","","","","","","","Applied Sciences","Kramers Laboratorium voor Fysische Technologie","","","",""