1,720,952 research outputs found
Hydrodynamic pressures on large lock structures
No full textWhen a navigation lock, dam, or any other structure with water is subjected to an earthquake, one of the dynamic loads will be hydrodynamic pressure. This is the pressure exerted by the fluid on the structure as a result of the different behavior in motion of solid and fluid. To determine this pressure there are several available methods which focus mainly on large dams or fluid storage containers. However, the hydrodynamic behavior of these types of structures is different and these methods may or may not be applicable for navigation locks. Therefore an analysis is made to determine the factors that contribute to the hydrodynamic pressure distribution on large lock structures. As a case study the Third Set of Locks Project of the Panama Canal is used. This expansion project ensures that the Panama Canal can process larger ships than the current Panamax class of ships, which dimensions are limited by the existing locks. Therefore larger locks are required which will operate next to the existing locks. The new locks are planned to be operational in 2014-2015. The Panama region is prone to earthquakes which could result in large hydrodynamic pressures on the locks. For the evaluation of hydrodynamic pressure on large lock structures, two analytical (1D and 2D) and one 2D finite-element model using DIANA are made. Three main aspects that contribute to hydrodynamic pressure are treated in detail: - Lock dimensions and water levels; - The effect of surface waves on the hydrodynamic pressure distribution; - The flexibility of the structure.Hydraulic EngineeringCivil Engineering and Geoscience
Quantum inspire - Qutech's platform for co-development and collaboration in quantum computing
No full textThe mission of QuTech is to bring quantum technology to industry and society by translating fundamental scientific research into applied research. To this end we are developing Quantum Inspire (QI), a full-stack quantum computer prototype for future co-development and collaborative R&D in quantum computing. A prerelease of this prototype system is already offering the public cloud-based access to QuTech technologies such as a programmable quantum computer simulator (with up to 31 qubits) and tutorials and user background knowledge on quantum information science (www.quantum-inspire.com). Access to a programmable CMOS-compatible Silicon spin qubit-based quantum processor will be provided in the next deployment phase. The first generation of QI's quantum processors consists of a double quantum dot hosted in an in-house grown SiGe/28Si/SiGe heterostructure, and defined with a single layer of Al gates. Here we give an overview of important aspects of the QI full-stack. We illustrate QI's modular system architecture and we will touch on parts of the manufacturing and electrical characterization of its first generation two spin qubit quantum processor unit. We close with a section on QI's qubit calibration framework. The definition of a single qubit Pauli X gate is chosen as concrete example of the matching of an experiment to a component of the circuit model for quantum computation.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.BUS/TNO STAFFQCD/Vandersypen LabQCD/Scappucci LabQN/Veldhorst LabQN/Vandersypen LabBUS/Quantum Delf
Robustness quantification for navigation locks that are part of the primary flood defense: A study into the effect of increasing the reliability requirement of structural elements on the robustness of the structural system
No full textRobustness is a hard-to-grip concept within engineering. This master thesis uses a framework to quantify the level of robustness that has been proposed by the Joint Committee on Structural Safety to assess the influence of the reliability requirement of a structural element. The lock complex at Weurt (the Netherlands) has been used for a case study to calculate robustness indices for multiple values of the reliability requirement. In addition, the influence of redundant elements has been examined. Based on the results it can be concluded that increasing the reliability requirement of an individual element does not necessarily result in a higher level of robustness. In some cases a lower robustness index is found. Redundant elements, however, do increase the level of robustness.Civil Engineering and GeosciencesHydraulic EngineeringHydraulic structures and Flood ris
Wegen op bermen van de dijken langs de Westerschelde: Toetsing op Veiligheid
No full textZeeweringen (PBZ
A sparse spin qubit array with integrated control electronics
No full textCurrent implementations of quantum computers suffer from large numbers of control lines per qubit, becoming unmanageable with system scale up. Here, we discuss a sparse spin-qubit architecture featuring integrated control electronics significantly reducing the off-chip wire count. This quantum-classical hardware integration closes the feasibility gap towards a CMOS quantum computer.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.QCD/Vandersypen LabOLD QCD/Charbon LabBUS/GeneralQCD/Veldhorst Lab(OLD)Applied Quantum ArchitecturesQN/Vandersypen La
Seismic Response of Liquid Storage Tank in a Semi Analytical Method
No full textThis thesis focuses on the dynamic analysis of liquid storage tanks subjected to seismic excitation with its primary aim being the development of a semi-analytical model able to predict this dynamic response accurately. In engineering practice, there are two primary methods to solve this problem. Numerical models based primarily on the finite element (FE) method, can treat the dynamics of the tank-liquid system with high accuracy. However, this comes at the cost of low computational speed; these models are slow and sophisticated finite element packages are required that can deal with both the structure and the liquid with equal rigor. On the other hand, analytical methods exist to solve the tank-liquid interaction problem. The latter, although computationally fast, lack of accuracy and can treat only the most simplistic configurations regarding the structural type. In this thesis, we aim to develop a semi-analytical model that combines the strong elements of both approaches, i.e. it is computationally fast and accurate.In the first part of the thesis, a two-dimensional case is analyzed in which the tank is composed out of three beams representing the plate and the wall of the tank, while the liquid is assumed two-dimensional. With this model, the semi-analytical solution method is established. The method is very straightforward and is based on the principle of dynamic sub-structuring which is valid for linear systems. The response of the structure, i.e., the three interconnected beams, is expressed in terms of the in-vacuo beam modes; a modal basis that is convenient since different modes are orthogonal to each other. The liquid motion is expressed as a superposition of two or three potentials each of which, in turn, is also shown in terms of modes. By representing the response of each sub-structure in terms of an orthonormal set of modes, the behavior of the system is spatially fixed, and the remaining unknowns are only the modal coefficients representing the multipliers of the various modal shapes. The latter is obtained by enforcing displacement compatibility conditions at the liquid-tank interface and by satisfying the forced equations of motion of the structure. The results of the adopted solution approach are compared against known results in the literature for validation purposes. With the developed three-dimensional model a parametric study is conducted in order to determine the influence of tanks dimensions, soil flexibility and wave speed on the structural response. Results are compared with others available in the literature in order to validate the model. The present model can be easily extended to include more complicated structures, e.g. horizontal tanks and tanks of different geometry. Finally, the model can be amended by a more accurate representation of the soil in terms of a three-dimensional layered continuum by merely adding an extra sub-structure to the system (the layered soil) while keeping the same solution approach.<br/
Verslag ballastmatten Roompot
No full textArtikel met beschrijving van het plaatsen van bodembeschermingsmatten met betonblokken door middel van een rol en afzinkponton (Cardium en Macoma).KWP-collectio
A Mode Matching Technique For The Seismic Response Of Liquid Storage Tanks Including Soil-Structure Interaction
No full textThe paper establishes a computationally inexpensive method to deal with the dynamic response of liquid storage tanks subjected to seismic excitation including dynamic soil-structure interaction. The tank is modelled as a thin shell, the stored liquid is described asan inviscid and incompressible fluid and the soil medium is modelled as an elastic continuum.The dynamic response of the tank-liquid-soil system is derived in the frequency domain usingdynamic substructuring and mode matching. The tank vibrations are first expressed in terms ofthe in-vacuo shell modes while the liquid motion is described as a superposition of linear po-tentials. The soil reaction to the plate of the tank is derived on the basis of a boundary integralformulation with the excitation field being the seismic free-field ground motion. Due to its highcomputational efficiency, the proposed method is suitable when a large number of simulations isrequired as is the case in seismic risk analysis. It overcomes the limitations of most mechanicalanalogues used nowadays, while at the same time maintains an accuracy comparable to that offinite element models within a fraction of the computation time of the latter.Offshore EngineeringDynamics of StructuresEngineering Structure
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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