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Calibri 83ffff̙̙3f3fff3f3f33333f33333.=TU Delft Repositoryg 6 uuidrepository linktitleauthorcontributorpublication yearabstract
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departmentresearch group programmeprojectcoordinates)uuid:935b7fbf3b06468b92cc722943f8b3baDhttp://resolver.tudelft.nl/uuid:935b7fbf3b06468b92cc722943f8b3baSThe application of Ag/AgCl electrodes as chloride sensors in cementitious materials/Pargar, F. (TU Delft Materials and Environment)svan Breugel, K. (promotor); Koleva, D.A. (copromotor); Delft University of Technology (degree granting institution)Determination of the chloride content in a reinforced concrete structure is important for evaluation of the risk of chlorideinduced corrosion of reinforcement. The traditional techniques for chloride determination in concrete are laborious, timeconsuming and cannot be used for continuous monitoring of the chloride content. The investigation on the use of Ag/AgCl electrodes as chloride sensors in cementbased materials dates back to 1990s. Interpretation of the sensor s response in cementitious materials requires the knowledge of chloride sensor s characteristics and the interaction between the sensor and the surrounding medium. Hence, the stability of the chloride sensor s response in cementitious materials depends on the properties of Ag/AgCl interface, AgCl/cement paste interface and the pore solution composition of cementitious materials. The influence of these factors on the stability of the sensor s response was studied in this thesis. In Chapter 1 the background and motivation for the thesis were presented. In Chapter 2 the advantages and drawbacks of available test methods for determination of the chloride content in cementitious materials were explained.Ag/AgCl electrode; chloride sensor; anodization; open circuit potential; stability; alkalinity; interference; hydration product; corrosion of steelendoctoral thesis9789461869722)uuid:4e63aefa04cf4a63a5b0e48d6e227390Dhttp://resolver.tudelft.nl/uuid:4e63aefa04cf4a63a5b0e48d6e227390MScheduling under uncertainty: Attaining flexibility, robustness and stability1Mountakis, Kiriakos Simon (TU Delft Algorithmics)oWitteveen, C. (promotor); Klos, T.B. (copromotor); Delft University of Technology (degree granting institution)The research presented in this thesis is part of the Rolling Stock Life Cycle Logistics applied research and development program, conducted by NedTrain. As a company, NedTrain belongs to Nederlandse Spoorwegen (NS; the principal railway company in the Netherlands) and provides maintenance services for the NS trainfleet. The aim of this program is to enhance NedTrain s competitiveness as a rollingstock maintenance services provider. Our work focuses on the operational aspects of this R&D program, motivated by the challenge of scheduling tasks (or operations) in a NedTrain maintenance workshop, such that trains are delivered ontime for circulation in the rail network. Most tasks in the workshop have uncertain durations (or processing times), which complicates the scheduling process.simple temporal network; flexibility; robustness; stability; scheduling under encertainty; resource constrained project scheduling; monte carlo sampling)uuid:b6797eb5537c4a6cb7a1b7d18081fea1Dhttp://resolver.tudelft.nl/uuid:b6797eb5537c4a6cb7a1b7d18081fea1JStability and Decentralized Control of PlugandPlay DC Distribution Gridsvan der Blij, N.H. (TU Delft DC systems, Energy conversion & Storage); Ramirez Elizondo, L.M. (TU Delft DC systems, Energy conversion & Storage); Spaan, M.T.J. (TU Delft Algorithmics); Bauer, P. (TU Delft DC systems, Energy conversion & Storage)Changes in distribution grids pose significant challenges with respect to the control and management of these grids. Stability and decentralized control are vital to ensure the availability and accessibility of plugandplay dc distribution grids that are (temporarily) without communication. Therefore, this paper presents guidelines for these grids tha< t ensure global stability and a decentralized control strategy that implements these stability guidelines. The stability guidelines are derived using a BraytonMoser representation of the system to arrive at a Lyapunov candidate function. Furthermore, the decentralized control strategy implements these stability guidelines and ensures that the voltages in the system remain within a specified range. Additionally, several simulations are performed to illustrate the stability of the system and the behavior of the control strategy under different scenarios.DC distribution grid; Decentralized control; decentralised control; Guidelines; Impedance; microgrid; plugandplay; Power system stability; stability; Stability criteria; Topologyjournal article'DC systems, Energy conversion & Storage)uuid:1d12467aaae94a64bec17e21aa58d642Dhttp://resolver.tudelft.nl/uuid:1d12467aaae94a64bec17e21aa58d642{Effects of Substrate and Polymer Encapsulation on CO<sub>2</sub> Electroreduction by Immobilized Indium(III) ProtoporphyrinBirdja, Yuvraj Y. (Leiden University); Vos, Rafal E. (Leiden University); Wezendonk, T.A. (TU Delft ChemE/Catalysis Engineering); Jiang, Lin (Leiden University); Kapteijn, F. (TU Delft ChemE/Catalysis Engineering); Koper, M.T.M. (Leiden University)Heterogenization of molecular catalysts for CO<sub>2</sub> electroreduction has attracted significant research activity, due to the combined advantages of homogeneous and heterogeneous catalysts. In this work, we demonstrate the strong influence of the nature of the substrate on the selectivity and reactivity of electrocatalytic CO<sub>2</sub> reduction, as well as on the stability of the studied immobilized indium(III) protoporphyrin IX, for electrosynthesis of formic acid. Additionally, we investigate strategies to improve the CO<sub>2</sub> reduction by tuning the chemical functionality of the substrate surface by means of electrochemical and plasma treatment and by catalyst encapsulation in polymer membranes. We point out several underlying factors that affect the performance of electrocatalytic CO<sub>2</sub> reduction. The insights gained here allow one to optimize heterogenized molecular systems for enhanced CO<sub>2</sub> electroreduction without modification of the catalyst itself.activity; CO electroreduction; immobilization; polymer encapsulation; pretreatment effect; selectivity; stability; substrate effect)uuid:aedf23cba2d449e782441524aa6e0de3Dhttp://resolver.tudelft.nl/uuid:aedf23cba2d449e782441524aa6e0de33Magnetic Detumbling of Fasttumbling Picosatellites{Fnod, R. (TU Delft Space Systems Egineering); Gill, E.K.A. (TU Delft Space Engineering; TU Delft Space Systems Egineering)The problem of pure magnetic detumbling of a fasttumbling picosatellite is considered. A new weighted Bdot control algorithm is proposed. The algorithm enables power reduction while not sacrificing detumbling performance. Analytical expressions relating the maximal expected rotational rate to the minimum sampling time required are presented. Simulation results demonstrate the practical benefits of the proposed approach for picosatellites.FPicosatellite; magnetic detumbling; Bdot; attitude control; stabilityconference paper+International Astronautical Federation, IAF)uuid:f611f70c83084522a95a31599778fe1eDhttp://resolver.tudelft.nl/uuid:f611f70c83084522a95a31599778fe1e>Some effects of crosswind on the lateral dynamics of a bicycleSchwab, A.L. (TU Delft Biomechatronics & HumanMachine Control); Dialynas, G. (TU Delft Biomechatronics & HumanMachine Control); Happee, R. (TU Delft Intelligent Vehicles)nEspinosa, Hugo G. (editor); Rowlands, David R. (editor); Shepherd, Jonathan (editor); Thiel, David V. (editor)The bicycle, being unstable at low speed and marginally stable at high speed, is sensitive to lateral perturbations. One of the major lateral perturbations is crosswind, which can lead to accidents and fatalities. Here we investigate the effect of crosswind on the lateral dynamics and control of the bicycle in a wide range of forward speeds and various cro< sswinds, by means of computer model analysis and simulation. A low dimensional bicycle model is used together with experimentally identified rider control parameters. The crosswind forces are obtained from a recent experimental study. Analysis and simulation show that crosswind decreases the stability of the bicycle and is clearly a safety issue.:bicycle; crosswind; dynamics; control; stability; handlingMDPI AG)uuid:025c6de29cb1473db9c4ff7574cb766aDhttp://resolver.tudelft.nl/uuid:025c6de29cb1473db9c4ff7574cb766aYBoron doping induced thermal conductivity enhancement of waterbased 3CSi(B)C nanofluidsLi, Bin (University of Science and Technology Beijing); Jiang, Peng (University of Science and Technology Beijing); Zhai, Famin (University of Science and Technology Beijing); Chen, Junhong (University of Science and Technology Beijing); Bei, G. (TU Delft MSE1; University of Science and Technology Beijing); Hou, Xinmei (University of Science and Technology Beijing); Chou, Kuo Chih (University of Science and Technology Beijing)In this paper, the fabrication and thermal conductivity (TC) of waterbased nanofluids using boron (B)doped SiC as dispersions are reported. Doping B into the <i></i>SiC phase leads to the shrinkage of the SiC lattice due to the substitution of Si atoms (0.134 nm radius) by smaller B atoms (0.095 nm radius). The presence of B in the SiC phase also promotes crystallization and grain growth of obtained particles. The tailored crystal structure and morphology of Bdoped SiC nanoparticles are beneficial for the TC improvement of the nanofluids by using them as dispersions. Using Bdoped SiC nanoparticles as dispersions for nanofluids, a remarkable improvement in stability was achieved in SiCB6 nanofluid at pH 11 by means of the Zeta potential measurement. By dispersing Bdoped SiC nanoparticles in waterbased fluids, the TC of the asprepared nanofluids containing only 0.3 vol.% SiCB6 nanoparticles is remarkably raised to 39.3% at 30 C compared to the base fluids, and is further enhanced with the increased temperature. The main reasons for the improvement in TC of SiCB6 nanofluids are more stable dispersion and intensive charge ions vibration around the surface of nanoparticles as well as the enhanced TC of the SiCB dispersions.=boron doping; SiC nanofluids; stability; thermal conductivityAccepted Author Manuscript
20190622)uuid:a5190c45516a472e95809c088df5dc86Dhttp://resolver.tudelft.nl/uuid:a5190c45516a472e95809c088df5dc86=First Tests on the Symmetrical Breakwater Armor Unit CrablockSalauddin, M (Chittagong University of Engineering and Technology; UNESCOIHE); Broere, A.; van der Meer, J.W. (UNESCOIHE); Verhagen, H.J. (TU Delft Coastal Engineering); Bijl, E (CDR International)Single layer concrete armor systems are being widely used nowadays in the design of rubble mound breakwaters. Recently, a new concrete armor unit has been developed and applied as single layer armor system in the repair works of one damaged breakwater at Al Fujeirah, UAE. It has a symmetrical shape, in contrast to most other units. Modern single layer concrete armor units that exist at this moment have design guidelines in terms of placement, stability and overtopping. However, because of lack of laboratory research and the little experience of using Crablock, no design guidance exists yet for this new single layer block compared to other existing one layer units. Being a new armor unit, the placement was investigated first. Then physical model tests were performed in a wave flume to come up with results on stability and wave overtopping. Furthermore, to determine the interlocking properties of armor units, pull tests were also conducted in this research. The placement tests showed that uniform placement was best achieved with a rectangular grid on a relatively small underlayer of rock. Test results on stability showed that longer waves affected the armor layer a little more, with more rocking and earlier start of damage. Packing density as well as placement pattern showed no influence on wave overtopping. T< he overtopping tests gave larger overtopping than expected, which might be due to the fairly steep 1:30 foreshore that gave a large ratio of significant waveheight from the time domain and the spectral waveheight.LCrablock; placement pattern; single layer armor; stability; wave overtopping
20190201Coastal Engineering)uuid:541ca256235b45f6bb919dac09c7880dDhttp://resolver.tudelft.nl/uuid:541ca256235b45f6bb919dac09c7880d=Stability of DC Distribution Systems: An Algebraic DerivationhInstability caused by low inertia and constant power loads is a major challenge of DC distribution grids. Previous research uses oversimplified models or does not provide general rules for stability. Therefore, a comprehensive approach to analyze the stability of DC distribution systems is desired. This paper presents a method to algebraically analyze the stability of any DC distribution system through the eigenvalues of its statespace matrices. Furthermore, using this method, requirements are found for the stability of three example systems. Additionally, a sensitivity analysis is performed, which considers the effect of several system parameters on the stability and disputes some overgeneralized conclusions of previous research. Moreover, various simulations are performed to illustrate the dynamic behavior of a stable and an unstable DC distribution system.JDC distribution; eigenvalues; sensitivity analysis; stability; statespace)uuid:f23d3a7699624f16be8cdab3bdfdb884Dhttp://resolver.tudelft.nl/uuid:f23d3a7699624f16be8cdab3bdfdb884KSecurity Evaluation of the Cyber Networks under Advanced Persistent ThreatsYang, L. (TU Delft Network Architectures and Services); Li, Pengdeng (Chongqing University); Yang, Xiaofan (Chongqing University); Tang, Yuan Yan (University of Macau)Advanced persistent threats (APTs) pose a grave threat to cyberspace, because they deactivate all the conventional cyber defense mechanisms. This paper addresses the issue of evaluating the security of the cyber networks under APTs. For this purpose, a dynamic model capturing the APTbased cyberattackdefense processes is proposed. Theoretical analysis shows that this model admits a globally stable equilibrium. On this basis, a new security metric known as the equilibrium security is suggested. The impact of several factors on the equilibrium security is revealed through theoretical analysis or computer simulation. These findings contribute to the development of feasible security solutions against APTs.ICyberspace; measurement; nonlinear dynamical systems; security; stability"Network Architectures and Services)uuid:0e1304bbc40542ea8b25730bd9e36e61Dhttp://resolver.tudelft.nl/uuid:0e1304bbc40542ea8b25730bd9e36e61QVoltage Control in Distributed Generation under Measurement Falsification AttacksMa, M. (TU Delft Intelligent Electrical Power Grids); Herdeiro Teixeira, A.M. (TU Delft Information and Communication Technology); van den Berg, J. (TU Delft Cyber Security; TU Delft Information and Communication Technology); Palensky, P. (TU Delft Intelligent Electrical Power Grids)Lowvoltage distribution grids experience a rising penetration of inverterbased, distributed generation. In order to not only contribute to but also solve voltage problems, these inverters are increasingly asked to participate in intelligent grid controls. Communicating inverters implement distributed voltage droop controls. The impact of cyberattacks to the stability of such distributed grid controls is poorly researched and therefore addressed in this article. We characterize the potential impact of several attack scenarios by employing the positivity and diagonal dominance properties. In particular, we discuss measurement falsification scenarios where the attacker corrupts voltage measurement data received by the voltage droop controllers. Analytical, controltheoretic methods for assessing the impact on system stability and voltage magnitude are presented and validated via simulation.QCyber security; distribution network; risk assessment; stability; voltage control)uuid:b884841b< a00b47e2be24f9f897479fe9Dhttp://resolver.tudelft.nl/uuid:b884841ba00b47e2be24f9f897479fe9;Takagi Sugeno fuzzy payload estimation and adaptive controlBeyhan, Selami (Pamukkale University); Eghbal Sarabi, F. (TU Delft Delft Center for Systems and Control); Lendek, Z (Technical University of ClujNapoca); Babuska, R. (TU Delft Learning & Autonomous Control)NDochain, Denis (editor); Henrion, Didier (editor); Peaucelle, Dimitri (editor)[In this paper, a novel adaptive TakagiSugeno (TS) fuzzy observerbased controller is proposed. The closedloop stability and the boundedness of all the signals are proven by Lyapunov stability analysis. The proposed controller is applied to a flexibletransmission experimental setup. The performance for constant payload in the presence of noisy measurements is compared to a controller based on a classical extended Luenberger observer. Simulation and realtime results show that the proposed observerbased feedback controller provides accurate position tracking under constant and varying payloads.oadaptive payload estimation; flexibletransmission system; observerbased control; stability; TS fuzzy modelingIFAC  Elsevier$Delft Center for Systems and Control)uuid:e35c47351f6f4e4cb7b8130f68a7dd02Dhttp://resolver.tudelft.nl/uuid:e35c47351f6f4e4cb7b8130f68a7dd02FReducing the covertodiameter ratio for shallow tunnels in soft soils&Vu Minh, N. (TU Delft Geoengineering)/Bosch, J.W. (promotor); Broere, W. (copromotor)9
Despite the fact that shallow tunnels have the benefits of low shortterm construction costs and longterm operational costs primarily due to the shallow depth of the station boxes, the limited understanding of shallow tunnelling in soft soils is an obstacle to the development of shallow tunnels in urban areas. This study carries out a theoretical investigation of the effects of reducing the covertodiameter ratio C/D for shallow tunnels in soft soils.<br/>In stability analysis, the uplift, face stability and blowout mechanisms are investigated. This study investigates interactions between the TBM and surrounding soil in tunnelling process, the stability of the TBM is not taken into account. The relationship between the C/D ratio and the required thicknesstodiameter ratio d/D as well as the required support pressures will be derived in various soils. Ranges of support pressures are also estimated for the TBM.<br/>Structural analysis is carried out for the variation of deformations and internal forces of the tunnel lining when reducing the C/D ratio. Since the conventional design models are not suitable in the case of shallow tunnels a new structural analysis model, which includes the difference between loads at the top and at the bottom of the tunnel, is proposed. Optimal C/D ratios with various d/D ratios for shallow tunnels in soft soils are also derived.<br/>With respect to ground movement analysis, this research investigates the areas affected by shallow tunnelling with a preliminary assessment of the risk of building damage by investigating surface and subsurface soil displacements. These areas are determined for different tunnel diameters in various soil types and are then compared to recent studies.<br/>The total volume loss is estimated at the tunnelling face, along the TBM, at the tail and includes longterm consolidation settlements. By combining empirical models from the literature and the proposed new models, the volume loss components are estimated both for shortterm construction and for the longterm consolidation effects. This shows that a no volume loss is feasible in shallow tunnelling with careful control of the support pressure.<br/>The boundaries of the influence zones in shallow tunnelling are identified and discussed on the basis of various case studies. The effects of the soil parameters on the influence areas are also investigated.<br/>From these calculations, the limits and optimal C/D ratios for shallow tunnelling are deduced and recommendations and solutions for improving the shallow tunnelling process are proposed in this dissertation.<brBtun< nelling; stability; tunnel lining; ground movement; volume loss9789402800289
20160912)uuid:90d4cf2b51ea43e1b9f81dd90879066dDhttp://resolver.tudelft.nl/uuid:90d4cf2b51ea43e1b9f81dd90879066diTurbulent Winds and Temperature Fronts in LargeEddy Simulations of the Stable Atmospheric Boundary LayerGSullivan, P.P.; Weil, J.C.; Patton, E.G.; Jonker, H.J.J.; Mironov, D.V.Pboundary layer; microscale processes/variability; stability; surface layer; windAmerican Meteorological Society
20161007!Civil Engineering and GeosciencesGeoscience and Remote Sensing)uuid:dd9ec35f99b54238ab795cb3db00ef49Dhttp://resolver.tudelft.nl/uuid:dd9ec35f99b54238ab795cb3db00ef49iSize and Promoter Effects on Stability of CarbonNanofiberSupported IronBased FischerTropsch CatalystsXie, Jingxiu (Utrecht University); Torres Galvis, HM (Utrecht University); Koeken, Ard C J (Dow Benelux); Kirilin, Alexey (Dow Benelux); Dugulan, A.I. (TU Delft RST/Fundamental Aspects of Materials and Energy); Ruitenbeek, Matthijs (Dow Benelux); de Jong, Krijn P. (Utrecht University)The Fischer"Tropsch Synthesis converts synthesis gas from alternative carbon resources, including natural gas, coal, and biomass, to hydrocarbons used as fuels or chemicals. In particular, ironbased catalysts at elevated temperatures favor the selective production of C2"C4 olefins, which are important building blocks for the chemical industry. Bulk iron catalysts (with promoters) were conventionally used, but these deactivate due to either phase transformation or carbon deposition resulting in disintegration of the catalyst particles. For supported iron catalysts, iron particle growth may result in loss of catalytic activity over time. In this work, the effects of promoters and particle size on the stability of supported iron nanoparticles (initial sizes of 3"9 nm) were investigated at industrially relevant conditions (340 C, 20 bar, H2/CO = 1). Upon addition of sodium and sulfur promoters to iron nanoparticles supported on carbon nanofibers, initial catalytic activities were high, but substantial deactivation was observed over a period of 100 h. In situ Mossbauer spectroscopy revealed that after 20 h timeonstream, promoted catalysts attained 100% carbidization, whereas for unpromoted catalysts, this was around 25%. In situ carbon deposition studies were carried out using a tapered element oscillating microbalance (TEOM). No carbon laydown was detected for the unpromoted catalysts, whereas for promoted catalysts, carbon deposition occurred mainly over the first 4 h and thus did not play a pivotal role in deactivation over 100 h. Instead, the loss of catalytic activity coincided with the increase in Fe particle size to 20"50 nm, thereby supporting the proposal that the loss of active Fe surface area was the main cause of deactivation.NFischer"Tropsch; FTO; iron; lower olefins; synthesis gas; stability; sintering/RST/Fundamental Aspects of Materials and Energy)uuid:50a904b7c50c414ba8bab979e2f9fe12Dhttp://resolver.tudelft.nl/uuid:50a904b7c50c414ba8bab979e2f9fe12jLimitState Design of a Steel Storage Tank Foundation on a Crushed Rock Ring Based on Proven Soil Strength+Reinders, K.J.; Schoenmaker, B.; Nohl, W.A.MNew vertical steel storage tanks founded on a shallow foundation of a crushed rock ring are planned at the same location of former storage tanks. The dimensions, loads and foundation of the new tanks are identical to the old tanks which were erected 40 years ago and demolished a few years ago. Despite the fact that the new tanks are identical to the old tanks, the stability calculation for the foundation of the new storage tanks did not fulfill the requirements of the present Eurocode 71. To ensure sufficient stability, additional measures like soil improvement are necessary. This is due to the fact that safety levels have much increased in the last 40 years. In order to optimize the design, it was decided to recalculate the stability using the code for existing structures NEN 8707 , which is currently being developed. According to NEN 8707 it is allowed < to use a lower value for the reliability index for existing structures compared to new structures, because of proven strength. Thus, lower partial load and material factors can be applied. These calculations with the adjusted partial factors resulted in a sufficient overall safety factor for the ultimate limit state for the hydrotest phase and the operational phase. Thus, using NEN8707, the tanks can be built on a crushed rock ring foundation without an expensive soil improvement.]stability; finite elements; existing structures; proven strength; crushed rock ring; factor)uuid:2ce88658a4c3459fafdc00a5ac2c4ac4Dhttp://resolver.tudelft.nl/uuid:2ce88658a4c3459fafdc00a5ac2c4ac4Degradation of CIGS solar cells
Theelen, M.J.Zeman, M. (promotor)Thin film CIGS solar cells and individual layers within these solar cells have been tested in order to assess their long term stability. Alongside with the execution of standard tests, in which elevated temperatures and humidity levels are used, the solar cells have also been exposed to a combination of elevated temperature and humidity and illumination, which also allowed insitu analysis of the changes in the electrical parameters. Additionally, the samples have been tested in the presence of water and various atmospheric species, like CO2, nitrogen and oxygen, in order to assess the impact of these species. Based on these experiments, it was concluded that CIGS solar cells can rapidly lose efficiency due to the migration of sodium, which occurs when exposed to illumination and water vapor. It was also observed that the transparent top electrode, consisting of ZnO:Al degraded rapidly in the presence of a combination of water and CO2, while it is stable in the presence of water combined with e.g. N2 and O2. The thesis also contains an extensive literature study on the stability of CIGS solar cells and a study on the temperature dependency of these solar cells.CIGS; solar cell; molybdenum; zinc oxide; stability; reliability; lifetime; insitu testing; illumination; damp heat; ZnO:Al; CO2; temperature dependency
201509058Electrical Engineering, Mathematics and Computer Science"PhotoVoltaic Devices and Materials)uuid:a6490a8efa1d46969570c9dd066b170fDhttp://resolver.tudelft.nl/uuid:a6490a8efa1d46969570c9dd066b170f6The impact of shallow cover on tunnelling in soft soil$Vu Minh, N.; Broere, W.; Bosch, J.W.Nshallow tunnel; support pressure; stability; blowout; wedge stability; upliftGeoscience & Engineering)uuid:283adb510b9e4c06b755d1b20133f62dDhttp://resolver.tudelft.nl/uuid:283adb510b9e4c06b755d1b20133f62d6Stability and robustness analysis of acyclic timetableYan, F.; Goverde, R.M.P.qTo satisfy the growing passenger transportation demands and improve the service quality n railway system, a more stable and robust timetable needs to be designed while considering highly utilized capacity. Acyclic timetable is extensively applied in large ailway networks. In order to acquire the quality of timetable, analytical timetable stability analysis software PETER (Performance Evaluation of Timed Events in Railways) is used o analyse timetable stability and robustness with delay impact, delay sensitivity and delay propagation. The method has been applied to the Yangtze River Delta of the Chinese ailway network.(acyclic timetable; stability; robustnessTransport & Planning)uuid:b095c1cd36dd4fb398a4ef96c2fff7d7Dhttp://resolver.tudelft.nl/uuid:b095c1cd36dd4fb398a4ef96c2fff7d7AA threelevel framework for performancebased railway timetabling`Goverde, R.M.P.; Besinovic, N.; Binder, A.; Cacchiani, V.; Quaglietta, E.; Roberti, R.; Toth, P.The performance of railway operations depends highly on the quality of the railway timetable. In particular for dense railway networks it can be a challenge to obtain a stable robust conflictfree and energyefficient timetable with acceptable infrastructure occupation and short travel times. This paper presents a performancebased railway timetabling framework using an integrated approach on three levels: microscopic, macroscopic and < a corridor finetuning level, to compute a timetable explicitly driven by the above mentioned performance indicators. A case study on the Dutch railway network illustrates the feasibility of this approach to achieve the highest timetabling design level.Jrailway timetabling; robustness; stability; micromacro; energy efficiency)uuid:c0f55288dcf34023ab4bcb8fdb3848afDhttp://resolver.tudelft.nl/uuid:c0f55288dcf34023ab4bcb8fdb3848af=High Efficiency UV Photodiodes fabricated on ptype SubstrateLRamachandra Rao, P.; Milosavljevic, S.; Kroth, U.; Laubis, C.; Nihtianov, S.ONewly developed pureboron photodiodes, with high sensitivity and stability in the whole ultraviolet range (UV), are described. The main purpose of this work is to create and characterize a largearea UV photodiode, representing a structure of a pixel in a backside illuminated CMOS image sensor, featuring maximum fill factor and hence sensitivity. The diodes have been processed by the Technology center of DIMES (Delft Institute for Microsystems and Nanoelectronics) on a ptype epitaxial wafer and thus are compatible with standard foundry processing. Care has been taken to keep the electrodes buried as much as possible to limit dark leakage current from interfaces. An electrical and optical characterization has been done by PTB (PhysikalischTechnische Bundesanstalt) using the UV beam lines of the Storage ring facility BESSY in BerlinCMOS Image Sensor; ultraviolet; photodiode; photodetector; quantum efficiency; spectral Responsivity; stability; backside illumination
lecture notesElectronic Instrumentation)uuid:4f9ed7f005e14cbc8992d91dc6c914d7Dhttp://resolver.tudelft.nl/uuid:4f9ed7f005e14cbc8992d91dc6c914d7_Validation and Optimization of a Design Formula for Stable Geometrically Open Filter Structures7Van de Sande, S.A.H.; Uijttewaal, W.S.J.; Verheij, H.J.Granular filters are used for protection against scour and erosion of base material. For a proper functioning it is necessary that at the interfaces between the filter structure, the subsoil and the water flowing above the filter structure no material will be transported. Different types of granular filters can be distinguished, this paper focuses on stable geometrically open filter structures under current attack. Hoffmans (2012) developed a design formula for stable geometrically open filters. This paper presents the validation and an optimization of the design formula based on performed model tests. It is shown that the current design formula is too conservative. The proposed improvements allows for a wider range of applicability.filter; granular filter; geometrically open filter; open filter; interface stability; bed protection; design formula; stability; optimization; ICCE 2014$Coastal Engineering Research CouncilHydraulic Engineering)uuid:25fbc40150f742a5ac2c2b4e0e00dc10Dhttp://resolver.tudelft.nl/uuid:25fbc40150f742a5ac2c2b4e0e00dc10mStability, Accuracy, and Robustness of the Time Domain Integral Equation Method for Radar Scattering AnalysisVan 't Wout, E.Vuik, C. (promotor).The aim of this thesis is to design a computational method that can be used in modern stealth technology. In particular, the computational method should be capable to simulate scattering of ultrawideband radar signals for military aircraft constructed with ferromagnetic radar absorbent materials. A fullwave boundary element method has been chosen because of its efficiency for electromagnetic scattering of electrically large structures. A timedomain method has been chosen because wideband signals can be simulated with a single run. Moreover, the future use of nonlinear constitutive equations for ferromagnetic materials requires simulation in time domain. To this end, the Time Domain Integral Equation (TDIE) method is used as computational method. More specifically, the numerical discretization of the Electric Field Integral Equation (EFIE) is given by the MarchingoninTime (MoT) scheme, which has been chosen because of its efficiency and accuracy. Instabilities prevent its industrial application to ste< alth technology, even for smallband and linear constitutive equations. In this thesis, a thorough numerical analysis on stability, accuracy, and robustness has been derived, resulting in clear guidelines for the choice of numerical parameters. Consequently, stable computer simulations have been achieved.radar scattering; computational electromagnetics; boundary element method; integral equation method; time domain; numerical analysis; stability; accuracy; robustness
20131111&Delft Institute of Applied Mathematics)uuid:51d7d1a37176460bafbd50071619e1d4Dhttp://resolver.tudelft.nl/uuid:51d7d1a37176460bafbd50071619e1d4XObservations of barrier island length explained using an exploratory morphodynamic modelRoos, P.C.; Schuttelaars, H.M.; Brouwer, R.L.Barrier coasts display a chain of islands, separated by tidal inlets that connect a backbarrier basin to a sea or ocean. Observations show that barrier island length generally decreases for increasing tidal range and increasing basin area. However, this has neither been reproduced in model studies nor explained from the underlying physics. This is the aim of our study. Here we simulate barrier coast dynamics by combining a widely used empirical relationship for inlet dynamics with a processbased model of the tidal hydrodynamics. Our model results show stable inlet systems with more than one inlet open that support the observed qualitative relationships and fit in existing barrier coast classifications. To explain this, we identify a competition between a destabilizing mechanism (bottom friction in inlets, tending to reduce the number of open inlets) and a stabilizing one (spatially varying pressure gradients over the inlets, tending to keep the inlets open).abarrier coast; multiple inlet systems; morphodynamic modeling; tidal flow; stability; equilibriumAmerican Geophysical Union
20140220)uuid:bff4c9dc21d540dd80732f7859f4b13dDhttp://resolver.tudelft.nl/uuid:bff4c9dc21d540dd80732f7859f4b13d_The cessation of continuous turbulence as precursor of the very stable nocturnal boundary layer0Van de Wiel, B.J.H.; Moene, A.F.; Jonker, H.J.J.The mechanism behind the collapse of turbulence in the evening as a precursor to the onset of the very stable boundary layer is investigated. To this end a cooled, pressuredriven flow is investigated by means of a local similarity model. Simulations reveal a temporary collapse of turbulence whenever the surface heat extraction, expressed in its nondimensional form h/L, exceeds a critical value. As any temporary reduction of turbulent friction is followed by flow acceleration, the longterm state is unconditionally turbulent. In contrast, the temporary cessation of turbulence, which may actually last for several hours in the nocturnal boundary layer, can be understood from the fact that the time scale for boundary layer diffusion is much smaller than the time scale for flow acceleration. This limits the available momentum that can be used for downward heat transport. In case the surface heat extraction exceeds the socalled maximum sustainable heat flux (MSHF), the nearsurface inversion rapidly increases. Finally, turbulent activity is largely suppressed by the intense density stratification that supports the emergence of a different, calmer boundary layer regime.tatmosphereland interaction; heat budgets/fluxes; small scale processes; stability; surface fluxes; nonlinear models
20130501Applied SciencesMultiScale Physics)uuid:83e91bac87e949a8aa6bb8e5f793f77bDhttp://resolver.tudelft.nl/uuid:83e91bac87e949a8aa6bb8e5f793f77bDetrainment in deep convection>Bing, S.J.; Siebesma, A.P.; Korpershoek, J.D.; Jonker, H.J.J.This study explores the mechanisms that determine detrainment in deep cumulus convection. A set of 90 highresolution Large Eddy Simulations is used to systematically explore the sensitivity of continental deep convection to the relative humidity and stability of the free troposphere. It appears that variations in the massflux profiles are determined by detrainment, rather than entrainment. The detrainment< shows a strong dependence on the critical mixing ratio, a dimensionless parameter which describes which mixtures of cloud core and environmental air are positively buoyant. A conceptual approach to the parameterization of detrainment is proposed on the basis of these results.>deep convection; detrainment; entrainment; humidity; stability
20130430Geoscience & Remote Sensing)uuid:dffbde0bef264d2fb9980f0db8001965Dhttp://resolver.tudelft.nl/uuid:dffbde0bef264d2fb9980f0db8001965;Stable and unstable coastal inlet crosssectional behaviour'Stive, M.J.F.; Tran, T.T.; Nghiem, T.L.6A review will be presented of the theory behind stable and unstable coastal inlet crosssectional behaviour. The theoretical findings behind stable coastal inlet crosssectional behaviour will be reviewed, analysed and confronted with empirical findings, leading to some unresolved questions. Second, seasonal variations will be shown to induce unstable coastal inlet behaviour, which leads to an interesting cycle of stable and unstable conditions. While this is especially relevant for Vietnamese coastal inlets at the central coast of Vietnam, as will be presented, the findings are of general value for many coastal inlets around the world. Adjacent coastal behaviour is strongly affected by the presence of inlets and the impacts of climate change on tidal basins will exert a strong influence on the adjacent coasts.coastal inlet; stabilityWater Resources University)uuid:da1014eb44254902a4e6c3882c5c056cDhttp://resolver.tudelft.nl/uuid:da1014eb44254902a4e6c3882c5c056cOn the stability of loose and strong partitioned algorithms for thermal coupling of domains using higher order implicit time integation schemes.Kazemi Kamyab, V.; Van Zuijlen, A.H.; Bijl, H.
Thermal interaction of fluids and solids, or conjugate heat transfer (CHT), is encountered in many engineering applications. Since timeaccurate computations of such coupled problems can be computationally expensive, we consider looselycoupled and strongly coupled solution algorithms in which higher order multistage RungeKutta schemes are employed for time integration. The higher order time integration schemes have the potential to improve the computational efficiency at arriving at a certain accuracy relative to the traditionally used 1st and 2nd order implicit schemes. The spatial coupling between the subdomains is realized using DirichletNeumann interface conditions and the coupled domains are solved in a sequential manner at each stage (Block GaussSeidel). In this paper, the stability of two partitioned algorithms is analyzed by considering a one dimensional model problem. The model problem consists of two thermally coupled domains where the governing equation within each subdomain is unsteady linear heat conduction. In the looselycoupled approach, a family of multistage IMEX schemes is used for time integration. By observing similarities between the second stage of the IMEX schemes and the ? scheme with ? = 0.5 (CrankNicolson), the stability of the partitioned algorithm in which the CrankNicolson scheme is used for time integration is first analyzed by applying the stability theory of GodunovRyabenkii. The stability of the IMEX schemes is next investigated by numerically solving the model problem and comparing the results to the conclusions of the stability analysis for the CrankNicolson scheme. Due to partly explicit nature of the IMEX schemes, the looselycoupled algorithm becomes unstable for sufficiently large Fourier numbers (similar to the CrankNicolson scheme). When the ratio of the thermal effusivities of the coupled domains is much smaller than unity, time step restriction due to stability is sufficiently weak that computations can be performed with reasonably large Fourier numbers. Furthermore, the results show better stability properties of the IMEX schemes compared to the CrankNicolson scheme. In the stronglycoupled approach, the stability and rate of convergence of performing (GaussSeidel) subiterations at each stage of the higher order implicit ESDIRK time inte< gration schemes are analyzed. From the stability analysis, an expression for the rate of convergence of the iterations (?) is obtained. For cases where ? ? 1, subiterations will convergence rapidly. However, when ? ? 1, the convergence rate of the iterations is slow. The results obtained by solving the model problem numerically are in line with the performed analytical stability analysis.Uhigh order implicit time integratio; conjugate heat; partitioned algorithm; stabilityAerospace Engineering'Aerdynamics, Wind Energy and Propulsion)uuid:f9cb0d90c4d44639a43b1554f3eac05cDhttp://resolver.tudelft.nl/uuid:f9cb0d90c4d44639a43b1554f3eac05cXField tests for operational shear strength assessment in peat at Uitdam, The NetherlandsZwanenburg, C.MStability assessment of existing dikes build on soft soil generates questions on the available stability calculation techniques and material models. Especially peat behaviour is not easily captured by standard design methods. This has led to disapproval, based on calculations, of dikes that have been in operation for several hundreds of years. To establish the weak points in the stability assessment prescribed by the available handbooks on dike engineering, a series of 5 field tests is started. These field tests give the option to compare the different design methods and different parameter assessment techniques to the test results. The series includes single stage and multi stage loading. This paper focuses on the single stage loading tests. The tests result in a failure mode that differs from the circular type failure planes that are used in engineering practice. Horizontal and vertical fractures dominate the active side of the failure while at the passive side the peat is compressed. The tests indicate that tensile strength of peat, or peat fibres, is important in understanding stability problems in which thick peat deposits are involved. Furthermore, the tests show that overconsolidated behaviour is important to understand the measurements, while in engineering practice peat is usually modelled as a normally consolidated material.,field tests; peat; shear strength; stability)uuid:7d70ca9bd1024f00a75c3cdb55f17df5Dhttp://resolver.tudelft.nl/uuid:7d70ca9bd1024f00a75c3cdb55f17df5On the timestepping stability of continuous masslumped and discontinuous Galerkin finite elements for the 3D acoustic wave equation&Zhebel, E.; Minisini, S.; Mulder, W.A.We solve the threedimensional acoustic wave equation, discretized on tetrahedral meshes. Two methods are considered: masslumped continuous finite elements and the symmetric interiorpenalty discontinuous Galerkin method (SIPDG). Combining the spatial discretization with the leapfrog timestepping scheme, which is secondorder accurate and conditionally stable, leads to a fully explicit scheme. We provide estimates of its stability limit for simple cases, namely, the reference element with Neumann boundary conditions, its distorted version of arbitrary shape, the unit cube that can be partitioned into 6 tetrahedra with periodic boundary conditions, and its distortions. The CFL stability limit contains a length scale for which we considered different options. The one based on the sum of the eigenvalues of the spatial operator for the first degree masslumped element gives the best results. It resembles the diameter of the inscribed sphere but is slightly easier to compute. The stability estimates show that masslumped continuous and SIPDG finite elements have comparable stability conditions, with the exception of the elements of the first degree. The stability limit for the masslumped elements is less restrictive and allows for larger time steps.Ystability; mass lumping; finite elements; discontinuous Galerkin; acoustic wave; equationVienna University of Technology)uuid:92497c0dd4ed444d97f7b3ef6cdbdff6Dhttp://resolver.tudelft.nl/uuid:92497c0dd4ed444d97f7b3ef6cdbdff62Increasing cheat robustness of crowdsourcing tasksEickhoff, C.; De Vries, A.P.Crowdsourcing successfully strives to become a widely used means of collect< ing largescale scientific corpora. Many research fields, including Information Retrieval, rely on this novel way of data acquisition. However, it seems to be undermined by a significant share of workers that are primarily interested in producing quick generic answers rather than correct ones in order to optimise their timeefficiency and, in turn, earn more money. Recently, we have seen numerous sophisticated schemes of identifying such workers. Those, however, often require additional resources or introduce artificial limitations to the task. In this work, we take a different approach by investigating means of a priori making crowdsourced tasks more resistant against cheaters.9crowdsourcing; user experiments; stability; human factorsSpringerVerlagIntelligent Systems)uuid:5d5ef62ea859429b8d081a3b97a97fa1Dhttp://resolver.tudelft.nl/uuid:5d5ef62ea859429b8d081a3b97a97fa1vOptimal error estimates of the local discontinuous Galerkin method for surface diffusion of graphs on Cartesian MeshesJi, L.; Xu, Y.In (Xu and Shu in J. Sci. Comput. 40:375 390, 2009), a local discontinuous Galerkin (LDG) method for the surface diffusion of graphs was developed and a rigorous proof for its energy stability was given. Numerical simulation results showed the optimal order of accuracy. In this subsequent paper, we concentrate on analyzing a priori error estimates of the LDG method for the surface diffusion of graphs. The main achievement is the derivation of the optimal convergence rate k + 1 in the L2 norm in onedimension as well as in multidimensions for Cartesian meshes using a completely discontinuous piecewise polynomial space with degree k ? 1.\local discontinuous Galerkin method; surface diffusion of graphs; stability; error estimatesSpringer)uuid:c0cb51f7dc9f418eb80da312e9f3b6b5Dhttp://resolver.tudelft.nl/uuid:c0cb51f7dc9f418eb80da312e9f3b6b5=Aeroelastic Stability Analysis for LargeScale Wind TurbinesMeng, F.Van Tooren, M.J.L. (promotor)_Nowadays, many modern countries are relying heavily on nonrenewable resources. One common example of nonrenewable resources is fossil fuel. Nonrenewable resources are ?nite resources that will eventually dwindle, becoming too expensive or too environmentally damaging to retrieve. In contrast, renewable energy resources, like wind energy, are constantly replenished and are important because of the bene?ts it provides for us as well as for our environment. However, getting the energy from wind must be further investigated in order to make the usage of wind energy more economically. During the past thirty years, the trend in wind energy is to increase the size of wind turbines for producing more electricity power with lower cost. The increase in size is bene?cial in terms of reduction of manufacturing costs per kW hours and reduction of the ground surface occupied by the wind farms. Further increases in size are not easily achievable because designers are expected to face more unknown technical problems such as aeroelastic stability problems. Therefore, it is important to investigate the aeroelastic stability problem of each new design concept in order to prevent the damage happen. In practice the larger blades have a lower edgewise frequency that is closer to the ?apwise frequency than the case for the smaller blades. This could result in bigger edgewise vibrations and unexpected aeroelastic problems. Larger blades will also result in large deformations even when the wind turbines are running at the design condition. Furthermore, designing pitchregulated wind turbines will often result in lightweight and very ?exible blades. The effects of large and ?exible blade are mainly reducing diameter of the rotor during operation and coupling between edgewise and torsional forces and motion. Most aeroelastic codes for wind turbines do not consider the e?ects of large de?ections in their simulation of the loads and responses. The reduced effective rotor area leads to lower power production than predicted by linear calculations and the coupling between edgewise and torsional force< s and motion will increases pitch moment at the blade pitch system. The problems mentioned above are the current research problems needed to be investigated and solved due to upscaling of the wind turbines. In this research work, nonlinear ?exible multibody dynamics has been chosen to couple with nonlinear aerodynamics to investigate the current research problems mentioned before. An aeroelastic simulation tool called MBDynAeroDyn is developed by integration of two existing code named MBDyn [1] and AeroDyn [2]. MBDyn is a nonlinear ?exible multibody dynamic code, which can simulate the effect of large de?ections and large rotations. The aerodynamic forces acting on wind turbine blades are calculated using AeroDyn which is based on the blade elementmomentum theory. Improvement of aerodynamic calculation has been made by adding a modi?ed PittPeters dynamic in?ow model in AeroDyn. Afterwards, both a linear time invariant system identi?cation method and a linear time periodic system identi?cation method have been used and implemented to investigate the aeroelastic stability of multiMW wind turbine blades. Finally wind tunnel measurements have been performed in order to validate the aeroelastic simulation tool developed in this work. The validation of this aeroelastic simulation code has been carried out in this thesis. The time domain simulation results show that this aeroelastic simulation tool has good agreement with wind tunnel experiment results at the design operation condition. For the offdesign cases, the differences become larger gradually. Further more, an aeroelastic simulation has been applied on a 5MW wind turbine. Comparison has been made between FAST and BLADMODE in time domain. The results show that MBDynAeroDyn and FAST have a good agreement for an uniform wind ?eld. Finally, ?aptorsion ?utter analysis on the 5MW wind turbine has been performed. The main feature of this aeroelastic simulation tool for multiMW large horizontal axis wind turbines developed in this work is that kinematically large displacements and rotations are included, and that loads are applied on the deformed geometry. This allows the designers to simulate large wind turbines with more ?exible blades to capture the effect of large displacements and rotations more accurately. Another feature is that both a linear time invariant system identi?cation method and a linear time periodic system identi?cation method have been implemented. It allows the designers to analyse stability from the time domain simulation data. From the result of ?aptorsion ?utter analysis on the 5MW wind turbine, it is shown that ?aptorsion ?utter is not likely to occur on this 5MW wind turbine with the current blade structural properties and intended operating conditions. Considering with the current Ph.D works which have been done so far, ?rstly, another wind tunnel experiment maybe necessary by using the same blades. Future measurement should be made at a higher rotation speed and combined with higher wind speed in order to ?nd the stability boundary of this model wind turbine. Secondly, this aeroelastic simulation tool should be integrated into a knowledge based engineering(KBE) wind turbine blades design environment in order to take advantage of this aeroelastic simulation tool. Further research work should be carried out to simulate wind turbine blades with smart control devices, for example, ?aps on the blades. Last but not the least, an user friendly graphical interface for this tool should be made in order to make it more convenient to use for a wider group of users.0wind turbine simulation; aeroelastic; stability*Aerospace Design, Integration & Operations)uuid:ccc6e7f33b214f05a0cadf8cad6d0ca0Dhttp://resolver.tudelft.nl/uuid:ccc6e7f33b214f05a0cadf8cad6d0ca0@Optimization of sandwich composites fuselages under flight loads7Yan, C.; Bergsma, O.; Koussios, S.; Zu, L.; Beukers, A.The sandwich composites fuselages appear to be a promising choice for the future aircrafts because of their structural efficiency and functional integration advantages. Howe< ver, the design of sandwich composites is more complex than other structures because of many involved variables. In this paper, the fuselage is designed as a sandwich composites cylinder, and its structural optimization using the finite element method (FEM) is outlined to obtain the minimum weight. The constraints include structural stability and the composites failure criteria. In order to get a verification baseline for the FEManalysis, the stability of sandwich structures is studied and the optimal design is performed based on the analytical formulae. Then, the predicted buckling loads and the optimization results obtained froma FEMmodel are compared with that from the analytical formulas, and a good agreement is achieved. A detailed parametric optimal design for the sandwich composites cylinder is conducted. The optimization method used here includes two steps: the minimization of the layer thickness followed by tailoring of the fiber orientation. The factors comprise layer number, fiber orientation, core thickness, frame dimension and spacing. Results show that the twostep optimization is an effective method for the sandwich composites and the foam sandwich cylinder with core thickness of 5 mm and frame pitch of 0.5 m exhibits the minimum weight.4sandwich; composites; stability; optimization; ANOVA%Aerospace Materials and Manufacturing)uuid:a8df2c53622845f4a5098f59561dab50Dhttp://resolver.tudelft.nl/uuid:a8df2c53622845f4a5098f59561dab50.Stability of fishing vessels in waves and windLaureano, Jose Luis Mantari6hydrodynamics; Fishing vessels; waves; wind; stability.Mechanical, Maritime and Materials EngineeringMarine and Transport Technology"Ship Hydromechanics and Structures)uuid:ab6380b3f24e4e219c61fdc7ddba7df6Dhttp://resolver.tudelft.nl/uuid:ab6380b3f24e4e219c61fdc7ddba7df6oBifurcation dynamics and avulsion duration in meandering rivers by onedimensional and threedimensional models;Kleinhans, M.G.; Jagers, H.R.A.; Mosselman, E.; Sloff, C.J.At river bifurcations, water and sediment are divided over two branches. The dynamics of the bifurcation determine the longterm evolution (centuries) of the downstream branches, potentially leading to avulsion, but the dynamics are poorly understood. The longterm evolution can only be studied by onedimensional models because of computational costs. For such models, a relation describing the sediment division is necessary, but only few relations are available and these remain poorly tested so far. We study the division of sediment and the morphodynamics on a timescale of decades to centuries by idealized threedimensional modeling of bifurcations with upstream meanders and dominantly bed load transport. An upstream meander favors one bifurcate with more sediment and the other with more water, leading to destabilization. The bifurcations commonly attain a highly asymmetrical division of discharge and sediment after a few decades to a few centuries, depending on combinations of the relevant parameters. Although past work on avulsions focused on slope advantage, we found that bifurcations can be quasibalanced by opposing factors, such as a bifurcate connected to the inner bend with a downstream slope advantage. Nearly balanced bifurcations develop much slower than unbalanced bifurcations, which explains the observed variation in avulsion duration in natural systems. Which branch becomes dominant and the timescale to attain model equilibrium are determined by the length of the downstream bifurcates, the radius of the upstream bend, a possible gradient advantage for one bifurcate and, notably, the width depth ratio. The latter determines the character of the bars which may result in overdeepening and unstable bars. The distance between the beginning of the upstream bend and the bifurcation determines the location of such bars and pools, which may switch the dominant bifurcate. In fact, when the bifurcation is quasibalanced by opposing factors, any minor disturbance or a different choice of roughness or sediment transport predictor may switch the dominant bifurcate. The< division of sediment is nearly the same as the division of flow discharge in most runs until the discharge division becomes very asymmetrical, so that a bifurcate does not close off entirely. This partly explains the sustained existence of residual channels and existence of anastomosing rivers and the potential for reoccupation of old channel courses. We develop a new relation for sediment division at bifurcations in onedimensional models incorporating the effect of meandering. The flow and sediment divisions predicted by two existing relations and the new relation for onedimensional models are in qualitative agreement with the threedimensional model. These onedimensional relations are however of limited value for wider rivers because they lack the highly threedimensional bar dynamics that may switch the direction of bifurcation evolution. The potential effects of bed sediment sorting, bank erosion, and levee formation on bifurcation stability and avulsion duration are discussed. bifurcation; avulsion; stability)uuid:629d48cd877740aca466622df6cfa7ceDhttp://resolver.tudelft.nl/uuid:629d48cd877740aca466622df6cfa7ceaExperimental and numerical stability investigations on natural circulation boiling water reactorsMarcel, C.P."van der Hagen, T.H.J.J. (promotor)WThe stability of natural circulation boiling water reactors is investigated with a strong emphasis on experiments. Two different facilities are used for such a task: the GENESIS facility (to which a void reactivity feedback system is artificially added) and the CIRCUS facility. In addition, numerical codes are also used in the investigation.Zstability; neutronicthermalhydraulic coupling; fluidtofluid scaling; boiling; flashing IOS Press)uuid:0c57ceb600b744349feea391208fe005Dhttp://resolver.tudelft.nl/uuid:0c57ceb600b744349feea391208fe0057Evolution of morphology in solidifying aluminium alloysDijkstra, W.O.Katgerman, L. (promotor); Vuik, C. (promotor)In the thesis two different models of solidification of aluminum alloys are presented and analyzed. The first 1D solidification model is derived from the conservation of solute, heat and mass. With numerical experiments it is shown that simulations with the Finite Difference discretization must adhere a relation similar to the CourantFriedrichsLewy relation in order to get numerical stable solutions. Furthermore, it is demonstrated that depending on the chosen discretization of the interface conditions an additional singularity which can destroy stability occurs. The occurrence of this singularity is not related to the Finite Difference discretization. Singularities are also found with application of the Collocation Method. An example of a solidifying aluminum slab is successfully solved with application of the model equations and avoiding stability infringements. The possibility to apply the model in an extended simulation, i.e. especially in the second solidification model, is discussed. The second new 2D solidification network model is used to simulate fluid flow and solidification within the mush. It is based on the assumption that the liquid parts of the mush can up to some degree be represented by a network of geometrical simplified liquid channels. Numerical simulations with this model indicate that conduction and convection of heat and solute affects directly only the permeability of a small region of the mush. Self induced effects and the formation wormholes have not been found. Finally, a detailed study of the influence of various model parameters of the network model is presented. A more detailed abstract is included within the thesis.Hsolidification; aluminium; permeability; mushy zone; stability; modelingMechanical Maritime and Materials Engineering)uuid:080e10d3c0024806b23cdb9ca2940f38Dhttp://resolver.tudelft.nl/uuid:080e10d3c0024806b23cdb9ca2940f38PMechanism of deactivation of Au/Fe2O3 catalysts under watergas shift conditions,Silberova, B.A.A.; Makkee, M.; Moulijn, J.A.8watergas shift; gold; Au/Fe2O3; stability; deactivation)uuid:fea943af3122457fb3bc51a4b7c75e12< Dhttp://resolver.tudelft.nl/uuid:fea943af3122457fb3bc51a4b7c75e12Bicycles made to measureVan Dijk, T.4Kooijman, J. (contributor); Schwab, A. (contributor)EFor almost a century and a half, mathematicians have been racking their brains about the bike. How can a rolling bicycle be so stable of its own accord? Delft researchers now say they have completed the model to end all models. Bicycle manufacturer Batavus intends to use it to make better bikes for the elderly and disabled.bicycle; stability)uuid:67e84328459e40e08fdf397ee9eedaf0Dhttp://resolver.tudelft.nl/uuid:67e84328459e40e08fdf397ee9eedaf0Reentry flight clearanceJuliana, S.Mulder, J.A. (promotor)yThe objective of the research was to identify and evaluate promising mathematical techniques for reentry flight clearance. To fulfil this objective, two mathematical methods were investigated and developed: analysis for linear models and interval analysis for both linear and nonlinear models. The stability of reentry vehicles in the presence of model uncertainties was chosen as the clearance criterion, which is represented by two mathematical criteria: worstcase eigenvalues (linear) and the Lyapunov stability (nonlinear). Two vehicle models including flight control systems were developed and used as case studies for the evaluation of the clearance techniques. These models are based on the DART (Delft Aerospace Reentry Test Demonstrator) and SPHYNX (Subscale Precursor Hypersonic X) reentry vehicle models. The suitability of the two mathematical techniques for reentry flight clearance was evaluated based on the results of the clearance application on these models. Nonlinear simulations were also performed to verify the clearance results generated by the two techniques. Nonlinear interval analysis has been found to be the most reliable method of all other methods investigated in this research, because it could perform the clearance for the nonlinear dynamic models of the reentry vehicles with uncertainties, and the results were confirmed by the nonlinear simulations.fstability; robustness; closedloop system; nonlinear; lyapunov function; interval; clearance; reentry)uuid:4cb9ff1501684709aa994a26a281d61dDhttp://resolver.tudelft.nl/uuid:4cb9ff1501684709aa994a26a281d61dPSymmetrypreserving discretization of the incompressible NavierStokes equations%Verstappen, R.W.C.P.; Veldman, A.E.P.kWe propose to discretize the convective and diffusive operators in the (incom pressible) NavierStokes equations in such a manner that their symmetries are preserved. The resulting spatial discretization inherits all symmetryrelated conservation and stability properties from the continuous formulation. In particularly, a symmetrypreserving discretization is unconditionally stable, and conserves the energy in the absense of viscous dissipation. In this paper, a fourthorder, symmetrypreserving discretization method is described and tested successfully for direct numerical simulation of turbulent channel flow.hhigherorder; finitevolume discretization; symmetry and conservation; stability; turbulent channel flow)uuid:a4249a270b9a481cade943ca57da718fDhttp://resolver.tudelft.nl/uuid:a4249a270b9a481cade943ca57da718fKOn a decoupled algorithm for poroelasticity and its resolution by multigrid,Gaspar, F.J.; Lisbona, F.J.; Oosterlee, C.W.In this work, we present a robust and efficient multigrid solver for a reformulated version of the system of poroelasticity equations. The reformulation enables us to treat the system in a decoupled fashion. It is sufficient to choose a highly efficient multigrid method for a scalar Poisson type equation for the overall solution of this poroelasticity system. With standard geometric transfer operators, a direct coarse grid discretization and a pointwise redblack GaussSeidel smoother, an efficient multigrid method is developed for all relevant choices of the problem parameters. According to classical multigrid theory, we observe multigrid convergence factors that are less than 0.1 for a variety of poroelastic problems< . Very satisfactory solution times are produced, that are about 10 times faster than the iterative solution of the coupled system, discretized on a staggered grid.Dporoelasticity; reformulation; stability; collocated grid; multigrid)uuid:998e8bf3529a4429840e95e0c938d9edDhttp://resolver.tudelft.nl/uuid:998e8bf3529a4429840e95e0c938d9ediDelft University of Technology; European Community on Computational Methods in Applied Sciences (ECCOMAS))uuid:c62cd1844ca349e0adc1a124639471f6Dhttp://resolver.tudelft.nl/uuid:c62cd1844ca349e0adc1a124639471f6HAeroelastic analysis of quasiaxisymmetrical airships at low Mach numberDestuynder, P.; Santi, F.An aeroelastic modelling of an axisymmetrical airship is discussed in this paper. The main difficulty is due to the fact that instabilities are not axisymmetrical. Furthermore an EulerLagrange kinematical coupling is necessary in order to represent the fluidstructure interaction. Our strategy is based on some arbitrary change of domain (for the air flow) which are governed by the movement of the structure. Some numerical results illustrate the method.=fluid dynamics; aeroelasticity; stability; airship technology)uuid:f8086ff80887454f85791c0b1aa750e3Dhttp://resolver.tudelft.nl/uuid:f8086ff80887454f85791c0b1aa750e3JStability and accuracy of active shielding for grounded capacitive sensors$Reverter, F.; Li, X.; Meijer, G.C.M.Oactive shielding; capacitive sensor; operational amplifier; stability; accuracyIOP)uuid:29a6e9fb2677464580a48af2802d9d1cDhttp://resolver.tudelft.nl/uuid:29a6e9fb2677464580a48af2802d9d1cA question of stabilityHartmann, L.Herder, J. (contributor)It is easy to see whether a system in equilibrium is stable when there are only two forces acting on it, as in a swing. But until recently, this was impossible for an equilibrium involving three forces, as in a hammock. A team of structural engineers at TU Delft have discovered a mathematical method of determining the stability of an equilibrium involving any number of forces of any nature, including gravity, springs, and magnetism. In addition the researchers have developed an elegant graphical method to determine the stability of certain states of equilibrium practically at first sight. This knowledge will be of particular interest to designers of robots, artificial hands, ships, and all sorts of other systems that have a delicate equilibrium. stabilityDelft University of Technology!Technology, Policy and Management)uuid:185086f352a54991a28378a667c01f5aDhttp://resolver.tudelft.nl/uuid:185086f352a54991a28378a667c01f5a2Fluid mechanical aspects of the gaslift techniqueGuet, S.; Ooms, G./bubbly flow; bubble size; lift force; stabilityAnnual Reviews)uuid:f99c58e8a61846e7a3e076d286109c5aDhttp://resolver.tudelft.nl/uuid:f99c58e8a61846e7a3e076d286109c5a5Design Considerations for the Glenohumeral ProsthesisOosterom, R./Beukers, A. (promotor); Rozing, P.M. (promotor)The shoulder joint provides us with a large range of motion. This is enabled by the shallowness of the glenoid cavity and the cooperation of many bone elements of the shoulder girdle. This results in complex biomechanics and dependency to surrounding soft tissues for its stability. Due to a fracture or joint diseases, a shoulder replacement may have to be performed, aiming at removing the excessive pain and to restore joint functionality. Especially postoperative joint functionality is not sufficient to perform tasks of daily living and many postoperative complications occur. Results must be improved, which, among others, can be achieved by design improvements. To restore the natural anatomy, the anatomical glenohumeral prosthesis is used, of which the geometry, insertion and fixation have been investigated. Parallel, a conceptually new design is developed, proposed for patients for whom no long lasting reliable solution is available. This design focuses on integration of lost anatomical functions with improved fixation techniques&shoulder prosthesis; design; stabilityDelft University Press)uuid:b8c80b587606< 4b239feeb7b81f21f5dcDhttp://resolver.tudelft.nl/uuid:b8c80b5876064b239feeb7b81f21f5dcGravitydriven bubbly flowsMudde, R.F.Tbuoyancy; vortical structures; turbulence structure; stability; LDA; CARPT; gas lift)uuid:658514ab9b484eec8df889b361c844c1Dhttp://resolver.tudelft.nl/uuid:658514ab9b484eec8df889b361c844c1kEffects of actuator dynamics on stabilization of highspeed planing vessels with controllable transom flapsXi, Handa; Sun, Jing,hydrodynamics; stability; controllable flaps)uuid:6a4cd23eb7914bc4acc6a7011cdb85bdDhttp://resolver.tudelft.nl/uuid:6a4cd23eb7914bc4acc6a7011cdb85bd!Identification of Spinal ReflexesDe Vlugt, E.Van der Helm, F.C.T. (promotor) Viscoelasticity of joints is important for the maintenance of the human body posture and can in two manners be regulated. By means of cocontraction of antagonistic muscle groups and by neural reflexive feedback of muscle length and muscle strength, measured both by means of sensors in the muscles. The impact of the reflexive regulation is considerable and infestation of this system can give serious motor deviations, like at the Parkinson's Disease. Except anatomical knowledge is there still little clear concerning of the functionality of reflexes. This comes because there is no adequate measurement technique during natural movements to quantify the neuromuscular system. During my promotion research I have developed and applied experimental techniques with which the gain of several neural feedback pathways can be measured. Techniques have been developed for posture tasks and have been applied on the human arm. The results indicate that the reflexive system is highly adaptable and under certain circumstances works as an optimum controller. There seems to be a tradeoff between two contrary properties: the magnitude of the viscoelasticity and the dynamic stability of the joint. Or, high reflexive feedback gains are desirable but are possible that mechanical oscillation occurs due to the neural time delay of the reflexive system. Such a dynamic analyses are new and make it possible to study the role of reflexes during natural movement. Benefits of this study ranges from new fundamental issues to clinical diagnostic tools.Sreflexive control; human arm; posture maintenance; system identification; stability"Design, Engineering and Production)uuid:9b24ce38056d4279b2eb3e57058de757Dhttp://resolver.tudelft.nl/uuid:9b24ce38056d4279b2eb3e57058de757;Definities en kwantificering van 'Coastal State Indicators'"Reintjes, C.M.; Aarninkhof, S.G.J.kustbeheer; coastal zone management; veiligheid; safety; stabiliteit; stability; recreatie; recreation; kustlijnontwikkeling; coastline developmentnlreport
Deltares (WL))uuid:d29c10f3a4b541d29a4aa1359b7e905fDhttp://resolver.tudelft.nl/uuid:d29c10f3a4b541d29a4aa1359b7e905f~Project steenstabiliteit WBKI 2003  Proefproject nieuwe spuisluizen Afsluitdijk: Toepassing ontwerpmethodiek bodemverdediging+Jongeling, T.H.G.; Jagers, H.R.A.; Blom, A.ontwerpregels; design rules; bodemverdediging; bed protection; turbulentiemodellen; turbulence models; turbulentieenergie; turbulent energy; Afsluitdijk; stabiliteit; stability)uuid:9be542d5165545e385cc78e3c0278d13Dhttp://resolver.tudelft.nl/uuid:9be542d5165545e385cc78e3c0278d13;Invloed van golfklappen op stabiliteit: Literatuuronderzoek
Coeveld, E.M.odijkbekleding; dike lining; steenzettingen; stone pitchings; golfklappen; wave slamming; stabiliteit; stability)uuid:7dd73bbc2d7d4290978b012073a0c231Dhttp://resolver.tudelft.nl/uuid:7dd73bbc2d7d4290978b012073a0c231oWBKI steenbestortingen 2002  Proefproject nieuwe spuisluizen Afsluitdijk: Afstemming methodiek / CFX modelbouw Jongeling, T.H.G; Jagers, H.R.A.dstromingsdruk; hydrodynamic pressure; turbulentiemodellen; turbulence models; stabiliteit; stability)uuid:c73f39a92d7c4a1cb7ee74b8ff90f986Dhttp://resolver.tudelft.nl/uuid:c73f39a92d7c4a1cb7ee74b8ff90f986Onderbouwing van het cellenconcept Westerschelde als instrument voor beleid en beheer: Toetsing aannames met SOBEK berekeningen*W< ang, Z.B.; Thoolen, P.M.C.; Tanczos, I.C.morfologie; morphology; onderhoudsbaggerwerken; maintenance dredging; stabiliteit; stability; vaargeulen; navigation channels; Westerschelde; Zeeland)uuid:79a35844ca33400ca4281e13d8f49e60Dhttp://resolver.tudelft.nl/uuid:79a35844ca33400ca4281e13d8f49e60(Eenvoudige toetsmethode voor havendammenKlein Breteler, M.Hhavendammen; jetties; dijkbekleding; dike lining; stabiliteit; stability)uuid:96bcdd1445e641abb230f909641c646eDhttp://resolver.tudelft.nl/uuid:96bcdd1445e641abb230f909641c646ebSpankrachtstudie, deelrapport 6: Nadere analyses en verdiepingsslagen in het Benedenrivierengebiedzomerbed; summer bed; riviermorfologie; river morphology; stabiliteit; stability; rivierdijken; levees; afwatering; drainage; benedenrivieren; lowland rivers)uuid:7aec6bdc77e6429984fa73b86af8f2cdDhttp://resolver.tudelft.nl/uuid:7aec6bdc77e6429984fa73b86af8f2cdXReport on measurements: Pressure and velocity fluctuations around a granularbed elementHofland, B.The second chapter describes the general methodology of the research. It presents the key questions about the entrainment of stones from granular filters that are as yet unanswered. It also describes the aspects that are being regarded in the analysis in this report. In chapter 3 the measuring setup is described. The following two chapters present the experimental results. Chapter 4 describes the pressures on and flow around a solitary bedmounted cube. This configuration can be regarded as a model for a very exposed stone, subject to a flow with low turbulence intensities. This simple configuration (already with a complicated flowfield) can also be calculated relatively easily. This generates the possibility to obtain even more information about the entire velocity and pressure field. Chapter 5 presents the measurements that have been done on the bedmounted cube as part of a (one layer thick) granular filter. The protrusion of the cube has been varied in order to examine the influence of the stone position on stability. In chapter 6 some further possible analyses on the measurements are described. Finally, in chapter 7 some conclusions are drawn from the results that have been gathered so far. SOME RELEVANT CONCLUSIONS  It was shown that both the fluctuating and the mean pressures are influenced by the position of the cube. This cube can be regarded as a model of a stone.  The average pressures on the bed mounted cube follow the p = Cp^2 law, with a positive C for the upstream side and a negative C for the top and the leeside.  Pressure on top of solitary bedmounted cube has a very high intensity and a maximum at u/f = 15.7granular filter; measurements; bed stability; stabilityTU Delft, Department of Hydraulic Engineering)uuid:8c4240fb0315462a8b3befbd0f0e68b6Dhttp://resolver.tudelft.nl/uuid:8c4240fb0315462a8b3befbd0f0e68b6\Energyfree systems: Theory, conception, and design of statically balanced spring mechanismsHerder, J.L.Cool, J.C. (promotor)>Static balance; stability; mechanism design; energyefficiency)uuid:9117236e0cf34fe2ae029e8b2adfd8a5Dhttp://resolver.tudelft.nl/uuid:9117236e0cf34fe2ae029e8b2adfd8a5=Verplaatsingsmetingen tijdens trekproeven op ingegoten basalt
Kuiper, C.Gbasalt; basalt; steenzettingen; stone pitchings; stabiliteit; stability)uuid:7ff41c0be51a470995665c914473689aDhttp://resolver.tudelft.nl/uuid:7ff41c0be51a470995665c914473689a4Bowthrusters and the stability of a riprap revetmentVerhagen, H.J.Because of problems with the design guidelines produced by PIANC for armoured slopes under attack by bowthrusters, additional work has been done in the Netherlands. On the basis of this work computational rules have been developed. However, because of the increase of bowthruster power, more detailed knowledge is needed on the effect of a bowthruster on the stability of a riprap revetment. Especially large, fast vessels will cause problems to shore protection. Recently P&O put into operation the Pride of Rotterdam , a luxury ferry with two bowthrusters with a capacity of 2< 000 kW each. When the captain uses both thrusters simultaneously, there is a considerable risk of damaging the rock of the underwater slope protection. But also with relatively small vessels for inland navigation problems arise when skippers use their bowthrusters. For the calculation of the effect of a bowthruster at this moment the common methodology is to use the hydraulics of a plain jet. This is not correct because the propeller in the tube causes quite some extra turbulence. This extra turbulence will cause extra damage to the shoreline protection. So in a good design formula for the determination of stability in a bowthrusterflow, he effect of additional turbulence of the propeller has to be included.!bowthruster; revetment; stability$Bulgarian Ship Hydromechanics Centre)uuid:78d111b93581486785fe96080ed57c79Dhttp://resolver.tudelft.nl/uuid:78d111b93581486785fe96080ed57c79HPressure Sensors and Filtering Techniques for Stone Stability AssessmentThis report is structured as follows: In chapter 2 the importance of wall pressures with respect to the present research is described. The literature on wall pressures that was used, and some general features of wall pressure fluctuations are subsequently described in chapter 3. Chapter 4 deals with the pressure sensors. It begins with a brief description of some general features of pressure sensors. Then the criteria for the required pressure sensor are given. This is followed by a description of the two types of pressure sensors, which were acquired from commercial companies. The character of the noise that is present in the measured pressure signal is described in chapter 5. This chapter ends with a list that comprises numerous possible sources of noise. A few dedicated filtering techniques that can be used to attenuate the vibrational and acoustical noise are described in the next chapter (chapter 6). Several experiments were executed in order to get a further idea of the possibilities of the sensors, and the nature of the noise that will be present in the measured signal. The setup of these experiments is described in chapter 7. An analysis of the tests that were executed is given in chapter 8. In this chapter the nature and magnitude of the various sources of noise are described. Chapter 9 presents the conclusions of the report. Based on these conclusions the requirements for the experimental facilities that are needed for the final experiments, and the choice of the best suited pressure sensor are given. MOST RELEVANT CONCLUSIONS  The pressure sensors seem to work satisfactorily regarding the accuracy and the frequency range they can cover.  Of the two types of pressure sensors tested, the Honeywell sensors are found to be more precise, as their range is better suited for the present application.  The temperature of the water must be kept constant, as the Honeywell sensor is influenced by it.Ipressure sensors; stone stability; stability; filtering techniques; noise)uuid:6fd62fc62eb8417393f9056fe1d5c6ebDhttp://resolver.tudelft.nl/uuid:6fd62fc62eb8417393f9056fe1d5c6ebLStability of stones in the top layer of a granular filter: Literature survey=In order to understand the processes involved in damaging a granular filter, the behaviour of the separate particles it is made of must be known. The hydrodynamic forces on the particles are very important for understanding this behaviour. These forces have been examined by many researchers. Chapter 2 deals with that aspect. The characteristics of stones, like shape, size and orientation influence these forces, so definitions of these characteristics, as well as their influence on stone stability are treated at the end of this chapter. The 3rd chapter of this report focuses on the stability of an entire bed, consisting of the particles that have been described in the first chapter. The stability is discussed first, followed by a description of some bedlead transport formulas. Several basic aspects of the influence of turbulence on stone stability and transport are treated as well. The final chapter deals with flow chara< cteristics in general. First of all boundary layer flow, especially over rough walls, will be treated. Research on turbulenceinduced wall pressureswhich might be used to correlate flow properties to stone stabilityis a separate field which generated a lot of research over the last decades. A model for calculating pressure fluctuations on the bed that can be related to stone stabilityis discussed. As it is expected that experiments with a backwardfacing step will be executed, this flow configuration is described. The chapter will be extended with other configurations when it becomes clear which flow configurations will be used for experiments to come.<granular filter; damage; top layer; stability; bed stability)uuid:197518013f4f4d92a740ba663c12fe6aDhttp://resolver.tudelft.nl/uuid:197518013f4f4d92a740ba663c12fe6aStone stabilitybMosselman, E.; Akkerman, G.J.; Verheij, H.J.; Hoffmans, G.J.C.M.; Jongeling, T.H.G.; Petit, H.A.H.Cstortsteen; rubble; stabiliteit; stability; turbulentie; turbulence)uuid:3b3b0f4fabf84256b7430cd132fdbe0aDhttp://resolver.tudelft.nl/uuid:3b3b0f4fabf84256b7430cd132fdbe0a1Stability of a sailing yacht floating upsidedownNomoto, Kensaku(yachting; stability; of; sailing; yachts)uuid:1eb67cb970284e44a6aaa85aeafbccb6Dhttp://resolver.tudelft.nl/uuid:1eb67cb970284e44a6aaa85aeafbccb68Stabiliteit van breuksteenoverlaging op een steenzettingKant, G.brekende golven; breaking waves; stabiliteit; stability; steenzettingen; stone pitchings; stortsteendammen; rubble dams; modelonderzoek; modelling)uuid:bde8851f70ba4abf9528192424db961bDhttp://resolver.tudelft.nl/uuid:bde8851f70ba4abf9528192424db961b4Open taludbekledingen: Uitspoeling van spleetvullingTulp, L.xsteenzettingen; stone pitchings; stabiliteit; stability; zand; sand; ontgronding door uitstroming; outflow induced scour)uuid:6cbe63270dd2455da15e1a6a4fd1f838Dhttp://resolver.tudelft.nl/uuid:6cbe63270dd2455da15e1a6a4fd1f838>Grasdijken: Analyse meetresultaten grootschalig modelonderzoekMeijer, D.G.; Verheij, H.J.gras; grass; dijkbekleding; dike lining; erosie; erosion; stabiliteit; stability; golfoploop; wave runup; modelonderzoek; modelling; dataanalyse; data analysis; golfbelasting; wave load)uuid:c38e218be9e643f987f3b4bc61686a9aDhttp://resolver.tudelft.nl/uuid:c38e218be9e643f987f3b4bc61686a9a1Probabilistische analyse stabiliteitsvoorspellersAkkerman, G.J.; Verheij, H.J.gsedimenttransport; sediment transport; turbulentie; turbulence; korrels; grains; stabiliteit; stability)uuid:6705b0ddec2b43b3967655fead1c5166Dhttp://resolver.tudelft.nl/uuid:6705b0ddec2b43b3967655fead1c5166GOpen taludbekledingen: Invloedsfactor van minimale klemkracht, AS.98.25Sdijkbekleding; dike lining; steenzettingen; stone pitchings; stabiliteit; stability)uuid:09d5a5c7616e4e96b5574e0fbe920c0eDhttp://resolver.tudelft.nl/uuid:09d5a5c7616e4e96b5574e0fbe920c0e>Literatuurinventarisatie stabiliteitsvoorspellers en gegevenswturbulentie; turbulence; korrels; grains; stabiliteit; stability; stroming; flow; sedimenttransport; sediment transport)uuid:25ca8f8ed0af42a4bd395bc609cf2bc6Dhttp://resolver.tudelft.nl/uuid:25ca8f8ed0af42a4bd395bc609cf2bc6wPiezodriven stages for nanopositioning with extreme stability: Theoretical acpects and practical design considerationsVan der Wulp, H.Van Beek, H.F. (promotor)Cnanopositioning; stability; Piezo actuators; capacitive transducers)uuid:9f59956042994f32a8d845ed5f930e10Dhttp://resolver.tudelft.nl/uuid:9f59956042994f32a8d845ed5f930e10Studie naar morfologische effecten van storten en baggeren in de Westerschelde: Ten behoeve van MER storten gebaggerd materiaal*Wang, Z.B.; Thoolen, P.M.C.; Fokkink, R.J.oWesterschelde; baggertechniek; dredging; morfodynamische modellen; morphodynamic models; stabiliteit; stability)uuid:9a85574009c14af5bf06355ba6b2b619Dhttp://resolver.tudelft.nl/uuid:9a85574009c14af5bf06355ba6b2b619LStability of the shoulder: Intrinsic muscle properties and reflexive controlRozendaal, L.A.RStassen, H.G. (promotor); Rozing, P.M. (prom< otor); Van der Helm, F.C.T. (promotor)Cshoulder; stability; muscle; posture maintenance; reflexive control)uuid:ec138024f94846f08b84c0e8cf16ea18Dhttp://resolver.tudelft.nl/uuid:ec138024f94846f08b84c0e8cf16ea18=Open taludbekledingen: Invloedsfactor van minimale klemkrachtMeijers, T.)uuid:da01c58e1285414b83dae31b812b11dcDhttp://resolver.tudelft.nl/uuid:da01c58e1285414b83dae31b812b11dc%Computation of Wave Ship InteractionsSclavounos, Paul D.=hydrodynamics; RPMethod; stability; seakeeping; waves; yachts)uuid:c29cd4a755c54c24b6f816f4f8956269Dhttp://resolver.tudelft.nl/uuid:c29cd4a755c54c24b6f816f4f8956269Damage Stability of Ships hydrodynamics; damage; stability)uuid:e7b8f91fcba948fcb6a0d30311cd1fd4Dhttp://resolver.tudelft.nl/uuid:e7b8f91fcba948fcb6a0d30311cd1fd4aDamage stability tests of model representing RoRo ferries performed at Danish Maritime Institute
Schindler, M./hydrodynamics; stability; damage; RoRo Ferries)uuid:4362230b60914a8384ffe4d86e2f8446Dhttp://resolver.tudelft.nl/uuid:4362230b60914a8384ffe4d86e2f8446bRoRo passenger ferry damage stability studies  A continuation of model tests for a typical ferry#Velschou, Svenn; Schindler, Michael)hydrodynamics; stability; damage; Ferries
indefinite)uuid:47bfec1b96d544baad69c4803f76060fDhttp://resolver.tudelft.nl/uuid:47bfec1b96d544baad69c4803f76060ffCollision damage statistics and probabilistic damage stability calculations in preliminary ship design,Jensen, J.Juncher; Baatrup, J.; Andersen, P.+hydrodynamics; collision; damage; stability)uuid:42f64718bb974441848790a181a5e673Dhttp://resolver.tudelft.nl/uuid:42f64718bb974441848790a181a5e673=Taludbekledingen van gezette steen: Vernieuwd BlackBox model)uuid:149c2b26c134433297f567b249fabaa9Dhttp://resolver.tudelft.nl/uuid:149c2b26c134433297f567b249fabaa9cCase studie Noord Schuddeland: Betrouwbaarheidsfuncties voor dijkbekledingen, inclusief reststerktetaludverdediging; slope protection; steenzettingen; stone pitchings; asfalt; asphalt; gras; grass; stabiliteit; stability; reststerkte; residual strength)uuid:766e1906dc4a4732a8b675fc6b04754dDhttp://resolver.tudelft.nl/uuid:766e1906dc4a4732a8b675fc6b04754d?Assessing the effects of LFE stabilisation on human performanceCrossland, P.; Strong, R.hydrodynamics; stability)uuid:aafc94fc33c14c9f8ccf764dbe743bf2Dhttp://resolver.tudelft.nl/uuid:aafc94fc33c14c9f8ccf764dbe743bf2,Dynamic Stability  Probabilistic ApproachesFrancescutto, Alberto.!hydrodynamics; Dynamic; stability)uuid:137cfb29bcdb450d9cf1c72b2664ba81Dhttp://resolver.tudelft.nl/uuid:137cfb29bcdb450d9cf1c72b2664ba81Detached BreakwatersSawaragi, T.TU Delft=In this paper, the hydraulic functions and stability of detached breakwaters and submerged breakwaters with wide crown widths are discussed. The following subjects with regard to detached and submerged breakwaters are discussed:  Function of detached breakwaters in controlling waves and waveinduced currents  Function of detached breakwaters in the control of sediment movement  Stability of detached breakwaters The functions of detached breakwaters and submerged breakwaters in controlling waves, waveinduced currents and sediment movement were discussed. As has already been reported by many researchers, detached breakwaters are very effective in controlling incident waves and salient or tombolo formation due to deposition of sediment sometime result in sever erosion of downstream coasts. On the other hand, submerged break waters have a relatively mild but steady effect in retaining shoreside sediment and have little effect on the surrounding coasts. Therefore, submerged breakwaters are recently replacing detached breakwaters in Japan. However, there are some issues related to submerged breakwaters: 1) They may become fatal obstacles for fishing boats or small pleasure boats; 2)The effect of a submerged breakwater on a coast with a wide tidal range is not obvious because the hydraulic function of the submerged breakwater depends on the water depth at the crown. I< n determining the stable weight of rubble stones for a submerged breakwater, it is important to consider the effects of irregularity and grouping of incident waves. Naturally, the wave period should also be taken into consideration, as was pointed out by Bruun and the author. From this point of view, the formula for determining the stable weight of rubble for submerged breakwaters as proposed by the Ministry of Construction of Japan needs to be further studied.Wdetached; submerged; breakwaters; sediment movement; stability; wave control; ICCE 1992$ICCE 1992 local organising committee ICCE 1992)uuid:4e27dc4bf58e444faadde3ad4769100cDhttp://resolver.tudelft.nl/uuid:4e27dc4bf58e444faadde3ad4769100c8Taludbekledingen van gezette steen: Veiligheidsfilosofie"Klein Breteler, M.; Rijke, W.G. dedijkbekleding; dike lining; taludverdediging; slope protection; steenzettingen; stone pitchings; veiligheid; safety; stabiliteit; stability)uuid:d2677d8090e64e7785f08056bf0726fbDhttp://resolver.tudelft.nl/uuid:d2677d8090e64e7785f08056bf0726fb]Bepaling stabiliteitsparameters voor piping modellering: Vooronderzoek voor Deltagoot proevenWal, M. van derIonderloopsheid; piping; modelonderzoek; modelling; stabiliteit; stability)uuid:14de09ec6a424654ad8edef2f5d44297Dhttp://resolver.tudelft.nl/uuid:14de09ec6a424654ad8edef2f5d44297.JAMUNA BRIDGE BANK PROTECTION RESEARCH PROJECT
Anonymous, A.Rijkswaterstaat7INTRODUCTION GENERAL SUMMARY OF EXPERIMENTS THE HARTEL CANAL PROTOTYPE EXPERIMENTS INTRODUCTION SITUATION INSTALLED INSTRUMENTS HYDRAULIC LOADS BEHAVIOUR OF TEST EMBANKMENTS Loose materials Plaeed (free) bloeks Flexible interloeked bloek revetments Sandsausage mattresses (Profix) PVC Reno mattresses (Maeeaferri Gabions) Fixtone (Bitumarin B.V.) STABILITY CALCULATIONS CONCLUSIONS EMBANKMENTS IJSSELMEER (HOUTRIBDIKE) INTRODUCTION SITUATION DESIGN ASPECTS DESCRIPTION OF THE TEST RESULTS THE STORM OF OCTOBER 20TH, 1986 DISCUSSION ON FAILURE MECHANISMS CONCLUSIONS8bridge; stability; revetment; embankment; hydraulic load?CUR civieltechnisch centrum uitvoering research and regelgevingKWPcollection)uuid:167f15e8e74147929abdb6a579135064Dhttp://resolver.tudelft.nl/uuid:167f15e8e74147929abdb6a5791350643Design criteria for vessels operating in the arcticJolles, W.H.=construction; Hull form; hull strength; stability; propulsionpublic lecture)uuid:a13dbd0558764c42ab37c718e60e0bdaDhttp://resolver.tudelft.nl/uuid:a13dbd0558764c42ab37c718e60e0bda[Taludbekledingen van gezette steen (deel XXII): Grondmechanische stabiliteit in de golfzonedijkbekleding; dike lining; taludverdediging; slope protection; steenzettingen; stone pitchings; stabiliteit; stability; golfaanval; wave attack)uuid:83afd5f6dbcf4f4183fce2a850ad87e4Dhttp://resolver.tudelft.nl/uuid:83afd5f6dbcf4f4183fce2a850ad87e4IStormvloedkering Oosterschelde: Nader onderzoek stabiliteit aanstortingenBoogaard, A.Deltaresaprons; bed protection; bodemverdediging; Oosterschelde; stabiliteit; stability; storm surge barriers; stormvloedkeringen; stortebedden; Zeeland)uuid:469aeb94187d4f2cbee8bcad39678a5cDhttp://resolver.tudelft.nl/uuid:469aeb94187d4f2cbee8bcad39678a5ceTaluds van losgestorte materialen: Stabiliteit van stortsteenbermen en teenkonstrukties (voorstudie)Vermeer, A.C.M.laprons; dijkbekleding; dike lining; slope protection; stabiliteit; stability; stortebedden; taludverdediging)uuid:c0b46de4f40e4096b241538dd935fc3aDhttp://resolver.tudelft.nl/uuid:c0b46de4f40e4096b241538dd935fc3aOStormvloedkering Oosterschelde: Invloed aanstortingen dorpelbalk op stabiliteitHartsuiker, G.bars; drempels; Oosterschelde; stabiliteit; stability; steenstorting; stone dumping; storm surge barriers; stormvloedkeringen; Zeeland)uuid:7241654b64d94353ab5e88956d71065dDhttp://resolver.tudelft.nl/uuid:7241654b64d94353ab5e88956d71065dbStormvloedkering Oosterschelde: Stabiliteit van stortsteen 60/300 kg rondom de damaanzet NoordlandMaat, S.MOosterschelde; rubble dams; stabiliteit; stability; stortsteendammen; Zeeland)uuid:c7cf2519008b4374< abf257948eb65ec8Dhttp://resolver.tudelft.nl/uuid:c7cf2519008b4374abf257948eb65ec8IAn investigation into stability of sailing yachts in large breaking wavesClaughton, A.; Handley, P.+yachting; yachts; breaking waves; stability)uuid:40ffa1b44f864a8fb1b7b52cb32fec1aDhttp://resolver.tudelft.nl/uuid:40ffa1b44f864a8fb1b7b52cb32fec1aqStormvloedkering Oosterschelde: Stabiliteit rand bestorting negatieve overlap voor situaties zonder pijlerinvloed
Taat, J.J.zbed protection; bodemverdediging; Oosterschelde; stabiliteit; stability; storm surge barriers; stormvloedkeringen; Zeeland)uuid:aa0622a3c9884027abfe7fe9c6ac411aDhttp://resolver.tudelft.nl/uuid:aa0622a3c9884027abfe7fe9c6ac411a^Stormvloedkering Oosterschelde: Stabiliteit negatieve overlap voor situaties met pijlerinvloed)uuid:0343c4a5dfa449cf96bcd079cbebc1fcDhttp://resolver.tudelft.nl/uuid:0343c4a5dfa449cf96bcd079cbebc1fc=Afsluiting Oosterschelde: Stabiliteit staalslak op blokkenmat
Jorritsma, J._block mattresses; blokkenmatten; Oosterschelde; slags; slakken; stabiliteit; stability; Zeeland)uuid:583c4d22624c470f8f77bd97fc8c2ab0Dhttp://resolver.tudelft.nl/uuid:583c4d22624c470f8f77bd97fc8c2ab0VStormvloedkering Oosterschelde: Stroombestendigheid van de drempel tijdens de bouwfaseAkkerman, G.J.gap sills; hydrodynamic pressure; Oosterschelde; sluitgatdrempels; stabiliteit; stability; storm surge barriers; stormvloedkeringen; stromingsdruk; Zeeland)uuid:8e2cbb41ea084cbd874fac9f0e77a604Dhttp://resolver.tudelft.nl/uuid:8e2cbb41ea084cbd874fac9f0e77a604\Afsluiting Oosterschelde  plaatsing pylonen: Stabiliteit van de bestorting onder de pylonenwbed protection; bodemverdediging; Oosterschelde; pijlers; pillars; stabiliteit; stability; steenstorting; stone dumping)uuid:3d3a7b90370b46c59e7fb4e5e6620647Dhttp://resolver.tudelft.nl/uuid:3d3a7b90370b46c59e7fb4e5e6620647xStormvloedkering Oosterschelde: Stabiliteit rand negatieve overlap orinterend onderzoek in de stroomgoot te Lith : notaAbed protection; bodemverdediging; stabiliteit; stability; Zeeland)uuid:7a38f9b57f71463599bbe59821676942Dhttp://resolver.tudelft.nl/uuid:7a38f9b57f71463599bbe59821676942aStormvloedkering Oosterschelde: Invloed spleethoogte op stabiliteit aanstortingen en drempelkruinKonter, J.L.M.`bars; bed protection; bodemverdediging; drempels; Oosterschelde; stabiliteit; stability; Zeeland)uuid:9ebb7ae4ef824eb0b218d62bcb977efdDhttp://resolver.tudelft.nl/uuid:9ebb7ae4ef824eb0b218d62bcb977efd+On the stability of semidisplacement crafts%MullerGraf, Burkhard; Schmiechen, M.)uuid:1e9a2f3766884334a6be321f30f75303Dhttp://resolver.tudelft.nl/uuid:1e9a2f3766884334a6be321f30f75303rStormvloedkering Oosterschelde: Drukverdeling aan de rand van een asfaltslab bij verschillende aanstroomrichtingen
Bakker, B.)uuid:c1adb12ef7414b73b2e446829a6f2ca6Dhttp://resolver.tudelft.nl/uuid:c1adb12ef7414b73b2e446829a6f2ca6#Mound Breakwaters under Wave Attack!Losada, M.A.; Gimnez Curto, L.A.Research on rubble mound breakwaters when confronted with waves. The rapport covers the flow characteristics and mound stability under regular waves and under oblique wave attack. The authors find a formula for rough, permeable slopes, flow characteristics under the action of a regular wave train by a function of the type. Furthermore they conclude that the distribution of flow characteristics in sea state can be obtained on the basis of interaction curves and joint probability density function of wave heights and periods. The conclusions on the mound stability of breakwaters are: Stability conditions of an undefined, rough, permeable slope are governed by the stability function. The stability function depends only on Iribarren's number. Randomness can be accounted for by using confidence bands for the stability function. For each type of armour unit, an optimum slope of maximum stability exists. The greater the interlocking among armour units the steeper the optimum slope and the more peaked the stability maximum. Given a rubble mound breakwater a minimum sea st< ate exists which produces a significant failure probability. If a sea state is presented which is the same or higher than this minimum, failure of the structure is only a question of the duration of the sea state. Conclusions on the characteristics and stability of rubble mound breakwaters under oblique wave attack: There is a dangerous lack of experimental data on the subject. Runup and rundown under small oblique incidence of waves (angle lower than 45 degrees) are function of Ir.cos(theta). For higher incidence angles the hypothesis is unreliable. The stability of steep slopes under oblique wave attack is not worse than under perpendicular wave incidence. For milder slopes the opposite may be true. The failure of probability of a rubble mound breakwater under a sea state with oblique incidence, can be calculated by taking into account the breaking limit, the interaction curve and a joint distribution of wave heights and periods.^breakwater; rubble mound breakwater; wave attack; wave forces; stability; flow characteristicsUniversity of Santander)uuid:c1fe9e8ea3d94b02bbfadcc317b9ee57Dhttp://resolver.tudelft.nl/uuid:c1fe9e8ea3d94b02bbfadcc317b9ee578Stormvloedkering Oosterschelde: Stabiliteit damaanzettenWouters, J.)uuid:0b1fe387d11542d998576cd785fde462Dhttp://resolver.tudelft.nl/uuid:0b1fe387d11542d998576cd785fde462QStability of ships, safety from capsize, and remarks on subdivision and freeboard0Abicht, Walter; Kastner, Sigismund; Wendel, Kurt,hydrodynamics; stability; capsize; freeboard)uuid:9f284d44f6814fa0993ed66fb4dc25abDhttp://resolver.tudelft.nl/uuid:9f284d44f6814fa0993ed66fb4dc25ab`Prediction of motion, stability, and wave load of Small Waterplane Area, Twin Hull ships (SWATH)%Lee, Choung Mook; Curphey, Richard M.9hydrodynamics; stability; Motion; twinn hull ships; SWATH)uuid:bb260aebeb7e43628af34cc4e06f2f3eDhttp://resolver.tudelft.nl/uuid:bb260aebeb7e43628af34cc4e06f2f3ekStormvloedkering Oosterschelde: Interne stabiliteit en zanddichtheid van de drempelconstructie onder vervalzclosure gaps; gap sills; Oosterschelde; sandtightness; sluitgatdrempels; sluitgaten; stabiliteit; stability; zanddichtheid)uuid:bc6657a61c774c039f81da8791fb8e01Dhttp://resolver.tudelft.nl/uuid:bc6657a61c774c039f81da8791fb8e01FFysicalengineering model of reinforced concrete frames in compressionBlaauwendraad, J.?A calculation of the complementary moments due to secondorder effects and the analysis of the stability of reinforced concrete framed structures can be conceived as follows. With the aid of a computer a very large number of MNx diagrams can be produced on the basis of the standard specified stressstrain diagrams for concrete and steel. A framed structure is then analysed with an available program which takes account of secondorder effects. The flexural stiffnesses EI to be adopted are estimated and corrected with reference to the MNx diagrams calculated once before and held in store for the purpose. The present paper discusses the drawbacks ofthis approach and proposes a method of analysis which can be fitted into existing programs for framed structures and dispenses with the large number of stored MNx diagrams. It is shown that direct use can be made of the stressstrain diagrams. The results are just as reliable as those obtained by the procedure utilising the MN/( diagrams. The method can be applied to total frames and single members in compression as well.6secondorder effect; stability; stressstrain relation)uuid:42fb495038204a64828add23291033edDhttp://resolver.tudelft.nl/uuid:42fb495038204a64828add23291033edNEnkamatten, deel I: Verlies van vullingsmateriaal en invloed op zanddichtheid Derks, H.rbank protection; geotextielen; geotextiles; oeverbescherming; sandtightness; stabiliteit; stability; zanddichtheid)uuid:034431d20e714bc68ba0a2d6efde66b9Dhttp://resolver.tudelft.nl/uuid:034431d20e714bc68ba0a2d6efde66b9xSystematisch onderzoek bodembescherming: Invloed geometrie en aard van de verdediging bij tweedimensionale ontgrondingen[bodembescherming; da<Jmmen; dams; ontgronding; scour; soil protection; stabiliteit; stability)uuid:2bf7ea237fbc4a6cab52a676bb328f76Dhttp://resolver.tudelft.nl/uuid:2bf7ea237fbc4a6cab52a676bb328f76pGeleidelijke sluiting  XIII: Stabiliteit van een blokkendam bij aanval door regelmatige en onregelmatige golvenWiggers, J.B.M.dammen; dams; golfaanval; onregelmatige golven; random waves; regelmatige golven; regular waves; stabiliteit; stability; wave attack)uuid:5ca19a72c995451c9a4b3ee58ee67944Dhttp://resolver.tudelft.nl/uuid:5ca19a72c995451c9a4b3ee58ee67944.Stability and Motion Control of Ocean VehiclesAbkowitz, Martin A.(hydrodynamics; stability; motion controlbook)uuid:4eba980a0cdd4f91bb9d9edf46a85ae6Dhttp://resolver.tudelft.nl/uuid:4eba980a0cdd4f91bb9d9edf46a85ae6ZGeleidelijke sluiting  VIII: Stabiliteit van een dam opgebouwd uit stortsteen Haringvlietadammen; dams; flow; golfaanval; rubble; stabiliteit; stability; stortsteen; stroming; wave attack)uuid:cef65bc45c2849f6834c75622aed01afDhttp://resolver.tudelft.nl/uuid:cef65bc45c2849f6834c75622aed01afRGeleidelijke sluiting  IX: Invloed van de vorm op de stabiliteit van betonblokkenlbetonblokken; concrete blocks; dammen; dams; flow; golfaanval; stabiliteit; stability; stroming; wave attack)uuid:8bc1dbb11d6c439ea4d36acab34f0465Dhttp://resolver.tudelft.nl/uuid:8bc1dbb11d6c439ea4d36acab34f0465LGeleidelijke sluiting  X: Stabiliteit van dammen opgebouwd uit betonblokkenCbetonblokken; concrete blocks; dammen; dams; stabiliteit; stability)uuid:5a459dc375904174b704fd373cfd505cDhttp://resolver.tudelft.nl/uuid:5a459dc375904174b704fd373cfd505cOGeleidelijke sluiting  VII: Stabiliteit van een dam opgebouwd uit betonblokken)uuid:993412ffe08249d88ad1fdcebfbe63dfDhttp://resolver.tudelft.nl/uuid:993412ffe08249d88ad1fdcebfbe63df\Geleidelijke sluiting VI: Invloed van de vorm en gradering op de stabiliteit van stortsteenBreusers, H.N.C.8dammen; dams; rubble; stabiliteit; stability; stortsteen)uuid:4e259c8ead8441ebac9032180fe2bcbeDhttp://resolver.tudelft.nl/uuid:4e259c8ead8441ebac9032180fe2bcbe\Geleidelijke sluiting III: Stabiliteit van een dam opgebouwd uit normale of vaste zandzakkenZdammen; dams; sand bags; scale effects; schaaleffecten; stabiliteit; stability; zandzakken)uuid:278d229793b240998fbfb049ddffe3e1Dhttp://resolver.tudelft.nl/uuid:278d229793b240998fbfb049ddffe3e1LGeleidelijke sluiting  II: Stabiliteit van een dam opgebouwd uit stortsteen)uuid:c364946a6e9743b28cbb19e328265324Dhttp://resolver.tudelft.nl/uuid:c364946a6e9743b28cbb19e328265324Classification des diguesIribarren Cavanilles, R.+Nogales y Olano, C. (contributor); TU DelftGDevelopment of a formula for the stability of rubble mound breakwaters.>rubble mound breakwaters; stability; wave action; armour unitsfrPIANC
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Root Entry Fp_r@p_r@@SummaryInformation( F<Workbook F0DocumentSummaryInformation8 F
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