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Dissertations / Theses on the topic 'Simulation of wave processes'

Author: Grafiati
Published: 28 May 2022
Last updated: 30 July 2025

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1

Nilsson, Erik Olof. "Fluxes and Mixing Processes in the Marine Atmospheric Boundary Layer." Doctoral thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-195875.

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Atmospheric models are strongly dependent on the turbulent exchange of momentum, sensible heat and moisture (latent heat) at the surface. Oceans cover about 70% of the Earth’s surface and understanding the processes that control air-sea exchange is of great importance in order to predict weather and climate. In the atmosphere, for instance, hurricane development, cyclone intensity and track depend on these processes. Ocean waves constitute an obvious example of air-sea interaction and can cause the air-flow over sea to depend on surface conditions in uniquely different ways compared to boundar
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2

Kryvets, Oleksandr Serhiiovych, Александр Сергеевич Кривец, Олександр Сергійович Кривець та А. А. Богдановский. "Экспериментальное моделирование волновых процессов в нерегулярном открытом волноводе с металло-диэлектрическим слоем". Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/4168.

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3

Vedin, Jörgen. "Numerical modeling of auroral processes." Doctoral thesis, Umeå University, Physics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1117.

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<p>One of the most conspicuous problems in space physics for the last decades has been to theoretically describe how the large parallel electric fields on auroral field lines can be generated. There is strong observational evidence of such electric fields, and stationary theory supports the need for electric fields accelerating electrons to the ionosphere where they generate auroras. However, dynamic models have not been able to reproduce these electric fields. This thesis sheds some light on this incompatibility and shows that the missing ingredient in previous dynamic models is a correct des
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4

Stiteler, Michael Ross. "An automated system for measuring PWB/PWBA warpage during simulation of the infrared reflow and wave soldering processes, and during operational thermal cycling." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/17099.

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5

Uchino, Hirotoshi. "Roles of Electron in Physical Processes Related to Magnetic Reconnections in the Earth’s Magnetosphere." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225409.

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6

Rocolle, Guillaume. "Simulation and Experimental Verification of the Flooding and Draining Process of the Tidal Energy Converter “Deltastream” during Deployment and Recovery." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9206.

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Deltastream is an on-going project carried by Tidal Energy Limited since almost twenty years. It is a tidal energy converter with a triangular shape and one turbine on each tower. It has gone through many evolutions of design but a first prototype will be installed in the end of 2014 at Ramsey Sound. The deployment and recovery operations will be carried out with a single lift point through a heavy lift frame. Two issues have to be tackled during the operation: the rate of flooding of the ballasts and the tension on the lift crane cable. The most favourable sea state must be found in order to
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7

Xi, Hong. "Theoretical and Numerical Studies of Frequency Up-shifted Ionospheric Stimulated Radiation." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29279.

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Stimulated electromagnetic emission (SEE) produced by interactions of high-power radio waves with the Earth's ionosphere is currently a topic of significant interest in ionospheric modification physics. SEE is believed to be produced by nonlinear wave-wave interactions involving the electromagnetic and electrostatic plasma waves in the altitude region where the pump wave frequency is near the upper hybrid resonance frequency. The most prominent upshifted feature in the SEE spectrum is the broad upshifted maximum (BUM). In this study, the instability processes thought to be responsible to the B
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8

Roy, Nipa. "Neural Field Theory of Nonlinear Wave-Wave and Wave-Neuron Processes." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18791.

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Biophysical processes related to the modulation of cellular mechanisms occur due to either presynaptic or postsynaptic effects. These processes involve some physiological phenomena whose different dynamics can potentially be distinguished via traces they leave in the power spectra of brain activity and/or connectivity fluctuations. Systematic expansion of NFT equations in terms of nonlinear response functions is formulated in Chapter 2 to enable a wide variety of nonlinear wave-wave and wave-neuron processes. This theory helps to handle neural quantities such as firing rates, neural field, som
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9

Барсегян, Н. М., Ірина Андріївна Буряк, Ирина Андреевна Буряк та ін. "Моделювання хвильових процесів в електродинамічних системах міліметрового діапазону довжин хвиль у CST Microwave Studio". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/63902.

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Розробка нових конструкцій пристроїв та приладів НВЧ діапазону неможлива без комп’ютерного моделювання хвильових процесів, які протікають в таких пристроях. Серед програмних середовищ для тривимірного моделювання важливе місце займає CST Microwave Studio, за допомогою якої можна моделювати перехідні процеси у складних електродинамічних системах: хвилеводах, фільтрах, смугових лініях, антенах тощо, а також отримувати S-параметри таких систем. Перевагами CST Microwave Studio є велика кількість інструментів для побудови широкого кола НВЧ конструкцій – від простих резонаторів до складних метамате
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10

Almquist, Martin. "Efficient Simulation of Wave Phenomena." Doctoral thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-310124.

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Wave phenomena appear in many fields of science such as acoustics, geophysics, and quantum mechanics. They can often be described by partial differential equations (PDEs). As PDEs typically are too difficult to solve by hand, the only option is to compute approximate solutions by implementing numerical methods on computers. Ideally, the numerical methods should produce accurate solutions at low computational cost. For wave propagation problems, high-order finite difference methods are known to be computationally cheap, but historically it has been difficult to construct stable methods. Thus, t
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11

Yu, Sihan. "Ocean Wave Simulation and Prediction." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/84992.

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WiFi can provide network coverage for users on land at anytime and anywhere, but on the sea, the wireless communication scenes change dramatically due to the signals are non-existence. Although some techniques (e.g. satellite, undersea fiber, microwave communication) have been used in marine communication, they are either too expensive with very small bandwidth, or too limited in its coverage range. We propose to develop a marine wireless mesh network which is formed by low cost buoyed wireless base stations to provide broadband connectivity for users on the sea. Ocean wave simulation and pred
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12

Xu, Haixia. "Wave-induced liquefaction processes in marine sediments." Thesis, University of Dundee, 2012. https://discovery.dundee.ac.uk/en/studentTheses/e9c70159-a416-49d7-b055-968991e55414.

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An investigation for seabed liquefaction induced by progressive water waves is vital for the protection of marine structures from damage to the structure foundations. The residual liquefaction in sedimentary seabed has been found to be of progressive nature and experiments have also demonstrated that the liquefied soil behaves as a visco-elastic-plastic material. Building on the previous research, this work develops various numerical models to re-examine the key factors which influence the progressive liquefaction processes.To investigate the effect of randomness of wave height on seabed lique
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13

Medina-López, Encarnación. "Thermodynamic processes involved in wave energy extraction." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31422.

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Wave energy is one of the most promising renewable energy sources for future exploitation. This thesis focuses on thermodynamic effects within Oscillating Water Column (OWC) devices equipped withWells turbines, particularly humidity effects. Previous theoretical studies of the operation of OWCs have resulted in expressions for the oscillation of the water surface in the chamber of an OWC based on linear wave theory, and the air expansion{compression cycle inside the air chamber based on ideal gas theory. Although in practice high humidity levels occur in OWC devices open to the sea, the influe
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14

Shabala, Alexander. "Mathematical modelling of oncolytic virotherapy." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:cca2c9bc-cbd4-4651-9b59-8a4dea7245d1.

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This thesis is concerned with mathematical modelling of oncolytic virotherapy: the use of genetically modified viruses to selectively spread, replicate and destroy cancerous cells in solid tumours. Traditional spatially-dependent modelling approaches have previously assumed that virus spread is due to viral diffusion in solid tumours, and also neglect the time delay introduced by the lytic cycle for viral replication within host cells. A deterministic, age-structured reaction-diffusion model is developed for the spatially-dependent interactions of uninfected cells, infected cells and virus par
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15

Smith, G. J. "Dynamic simulation of chemical processes." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372635.

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16

Singh, Lakhbinder. "Dynamic simulation of chemical processes." Thesis, Aston University, 1991. http://publications.aston.ac.uk/9731/.

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This thesis describes the design and implementation of an interactive dynamic simulator called DASPRII. The starting point of this research has been an existing dynamic simulation package, DASP. DASPII is written in standard FORTRAN 77 and is implemented on universally available IBM-PC or compatible machines. It provides a means for the analysis and design of chemical processes. Industrial interest in dynamic simulation has increased due to the recent increase in concern over plant operability, resiliency and safety. DASPII is an equation oriented simulation package which allows solution of dy
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17

Willes, Andrew James. "Coherent wave processes in solar and interplanetary plasmas." Thesis, The University of Sydney, 1996. https://hdl.handle.net/2123/27549.

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This thesis treats two aspects of coherent wave emission processes in space plasmas. Part I is concerned with the process of second harmonic plasma emission, as applied to solar radio type III bursts. Part II details a theory for simultaneous multiple frequency bands observed in solar microwave spike bursts, based on the electron-cyclotron maser mechanism.
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18

Shand, Thomas Duncan Civil &amp Environmental Engineering Faculty of Engineering UNSW. "The effect of wave grouping on shoaling and breaking processes." Awarded by:University of New South Wales. Civil & Environmental Engineering, 2009. http://handle.unsw.edu.au/1959.4/44588.

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Determining the largest breaking wave height which can occur in water of finite depth is a fundamental reference quantity for the design of coastal structures. Current design guidelines are based on investigations which predominantly used monochromatic waves, thereby neglecting group effects which are inherent to the free propagation of waves in deep water. The Coastal Engineering Manual (CEM) states that wave grouping and its consequences is of significant concern, with breakwater armour damage being generally attributed to higher waves associated with wave groups. However, the CEM also ackno
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19

Talukder, Dipongkar. "Multi-baseline gravitational wave radiometry." Pullman, Wash. : Washington State University, 2008. http://www.dissertations.wsu.edu/Thesis/Fall2008/d_talukder_112408.pdf.

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Thesis (M.S. in physics)--Washington State University, December 2008.<br>Title from PDF title page (viewed on June 19, 2009). "Department of Physics and Astronomy." Includes bibliographical references (p. 44-46).
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20

Fashanu, Udofe Peter Taiwo. "Simulation and analysis of wave-structure interactions." Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1310.

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Today, it is widely recognized that Computational Fluid Dynamics (CFD) methodologies should be used for the analysis of Engineering systems and that design and method of simulation must be practical and realistic to provide cost effective solutions. The recent development in CFD of Engineering Structures has led to the adoption of the Eulerian and Lagrangian concepts of numerical analysis. Although the importance of these concepts cannot be overemphasised in offshore structures hydrodynamics, thus the choice of a concept to define the flow field surrounding a structure is one of the fundamenta
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21

Seljåsen, Håkon. "Simulation of nonlinear wave propagation in ultrasound." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25589.

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Nonlinear wave propagation has, for the last couple of decades, become an increasingly more important tool in medical ultrasound imaging. Creating ultrasound images from echoes in the second harmonic frequency band provides a major enhancement to the image quality, reducing body wall reverberation and also reducing perturbations from off-axis echoes.The aim of this study has been to make a fast implementation of nonlinear wave simulation in ultrasound, based on the Propose method, and investigate its agreement with the state-of-the art simulation tool, Abersim. Agreement between the methods ha
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22

Strohm, Christian. "Circuit Simulation Including Full-Wave Maxwell's Equations." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22544.

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Diese Arbeit widmet sich der Simulation von elektrischen/elektronischen Schaltungen welche um elektromagnetische Bauelemente erweitert werden. Im Fokus stehen unterschiedliche Kopplungen der Schaltungsgleichungen, modelliert mit der modifizierten Knotenanalyse, und den elektromagnetischen Bauelementen mit deren verfeinerten Modell basierend auf den vollen Maxwell-Gleichungen in der Lorenz-geeichten A-V Formulierung welche durch Finite-Integrations-Technik räumlich diskretisiert werden. Eine numerische Analyse erweitert die topologischen Kriterien für den Index der resultierenden differential-a
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23

Bach, Christian. "Simulation of nonadiabatic processes on surfaces." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972330690.

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Kralj, Cedomir. "Numerical simulation of diesel spray processes." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/7964.

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25

Hellander, Stefan. "Stochastic Simulation of Reaction-Diffusion Processes." Doctoral thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-198522.

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Numerical simulation methods have become an important tool in the study of chemical reaction networks in living cells. Many systems can, with high accuracy, be modeled by deterministic ordinary differential equations, but other systems require a more detailed level of modeling. Stochastic models at either the mesoscopic level or the microscopic level can be used for cases when molecules are present in low copy numbers. In this thesis we develop efficient and flexible algorithms for simulating systems at the microscopic level. We propose an improvement to the Green's function reaction dynamics
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26

Kennerberg, Philip. "Simulation of interpolating determinantal point processes." Thesis, KTH, Matematik (Avd.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167972.

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In this master thesis I aim to present some of the basic theory of determinantal processes. Some preliminary theory of random measures and point-process theory is reviewed in the first chapter. In the second chapter I introduce the notion of a determinantal process, through what is called trace-class kernels. I mention a few of the most fundamental theorems from the field and go through some useful theorems for determinantal processes concerning interpolation between different processes. An algorithm for simulating determinantal processes was suggested earlier in [9]. I study this algorithm an
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Jones, Richard Anthony. "Simulation and learning in decision processes." Thesis, University of Bristol, 1999. http://hdl.handle.net/1983/a507fc54-1408-4b21-9de4-8850e5735500.

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In this thesis we address the problem of adaptive control in complex stochastic systems when the system parameters are both known and unknown. The type of models we consider are those which, in the full information case, are known as Markov Decision Processes. We introduce versions of two new algorithms, the optimiser and the p-learner. The optimiser is a simulation based method for finding optimal values and optimal policies when the system parameters are known. The p-learner is an algorithm for learning about the state transition probabilities; we use it in conjunction with the optimiser whe
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Figwer, Jarosław. "Synthesis and simulation of random processes." Praca habilitacyjna, Wydawnictwo Politechniki Śląskiej, 1999. https://delibra.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=8070.

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ABU, HAMMAD AYMAN ABDALLAH. "SIMULATION MODELING OF MANUFACTURED HOUSING PROCESSES." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1015617645.

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30

Formentin, Sara Mizar <1987&gt. "Neural network modelling of the wave-structure interaction processes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7001/1/formentin_saramizar_tesi.pdf.

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This thesis presents a new Artificial Neural Network (ANN) able to predict at once the main parameters representative of the wave-structure interaction processes, i.e. the wave overtopping discharge, the wave transmission coefficient and the wave reflection coefficient. The new ANN has been specifically developed in order to provide managers and scientists with a tool that can be efficiently used for design purposes. The development of this ANN started with the preparation of a new extended and homogeneous database that collects all the available tests reporting at least one of the three para
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Formentin, Sara Mizar <1987&gt. "Neural network modelling of the wave-structure interaction processes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7001/.

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This thesis presents a new Artificial Neural Network (ANN) able to predict at once the main parameters representative of the wave-structure interaction processes, i.e. the wave overtopping discharge, the wave transmission coefficient and the wave reflection coefficient. The new ANN has been specifically developed in order to provide managers and scientists with a tool that can be efficiently used for design purposes. The development of this ANN started with the preparation of a new extended and homogeneous database that collects all the available tests reporting at least one of the three para
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32

Wang, Xuanmin. "Computer simulation of rotational moulding." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282352.

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33

Davis, Charles A. "Computer simulation of wave propagation through turbulent media." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA283695.

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Jones, R. A. "Simulation of shear wave propagation in gelling systems." Thesis, Swansea University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637714.

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Conventional, forced, non-resonant oscillatory rheometers can possess limitations in the measurement of some gels, where they display a pronounced mechanical weakness, are highly shear sensitive and exhibit marked time dependence. Instead, shear wave propagation techniques are proposed as one alternative. One instrument that employs shear wave propagation techniques in the determination of the dynamic shear moduli, G' and G", is the Pulse Resonance Rheometer. The Pulse Resonance Rheometer uses two modes of operation, measurements of the velocity of pulse propagation and measurements of the res
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Peterson, Andrew William. "Simulation and Testing of Wave-Adaptive Modular Vessels." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54555.

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This study provides a comprehensive performance analysis of Wave-Adaptive Modular Vessels (WAM-V) using simulations and testing data. WAM-Vs are a new class of marine technology that build upon the advantages of lightweight, low-draft, catamaran construction. Independent suspensions above the hulls isolate the passengers and equipment from the harsh sea environment. Enhanced understanding of the relationship between suspension and vehicle performance is critical for future missions of interest to the U.S. Navy. Throughout this study, the dynamic properties of three different WAM-Vs were eval
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Nelsen, Cory. "Multiscale modeling and simulation of shock wave propagation." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/2591.

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Multiscale modeling and simulation has been a growing interest for researchers as computational power and speed has increased. Multiscale models allow for the study of different size scales, which may be governed by different sets of physical laws. Typically, the homogenization between the different scales is done at a zero temperature. The main goal of this thesis is to develop and conduct multiscale modeling and simulation of shock wave propagation with the removal of numerical errors and inclusion of temperature effects
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Jarvis, Richard Barry. "Robust dynamic simulation of chemical engineering processes." Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/7309.

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O'Donovan, Brendan Donal. "Modelling and simulation of engineering design processes." Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/251938.

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Nilsson, Annika. "Modelling and simulation of metal working processes /." Luleå, 2000. http://epubl.luth.se/1402-1544/2000/41/index.html.

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Åström, Peter. "Simulation of manufacturing processes in product development /." Luleå, 2004. http://epubl.luth.se/1402-1544/2004/56.

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Chaleeraktrakoon, Chavalit. "Stochastic modelling and simulation of streamflow processes." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28704.

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The main objectives of this research are to propose a general stochastic method for determining analytically the distribution of flood volume, and to develop a simulation procedure for generating synthetic multiseason streamflows at different sites simultaneously. The research study is divided into two parts: (a) First, a general stochastic model is proposed to derive analytically the probability distribution function for flood volume. The volume of a flood is defined as the sum of an unbroken sequence of consecutive daily flows above a given truncation level. Analytical expressions were then
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Ward, R. G. "Simulation of analogue to digital conversion processes." Thesis, Swansea University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639345.

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The use of low oversampling ratio delta-sigma modulators with digital filters is investigated as a means of analogue to digital conversion for a 'Multiplexed Analogue Components' television receiver. Various means of enhancing the performance of delta-sigma modulator - digital filter combinations are analysed theoretically and tested practically. A system whereby an analogue pre-emphasis filter is used, is proposed and evaluated. Performance analysis is effected by processing pictures stored in a frame store. Simulation of the analogue to digital conversion processes is carried out by running
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葉錦元 and Kam-yuen William Yip. "Simulation and inference of aggregated Markov processes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31977546.

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Ho, Ping-Wing. "Discrete event simulation for yarn manufacturing processes." Thesis, University of Huddersfield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315679.

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Wynn, Edward James William. "Simulation of size distributions in particulate processes." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389439.

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Marbach, Peter 1966. "Simulation-based optimization of Markov decision processes." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9660.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.<br>Includes bibliographical references (p. 127-129).<br>Markov decision processes have been a popular paradigm for sequential decision making under uncertainty. Dynamic programming provides a framework for studying such problems, as well as for devising algorithms to compute an optimal control policy. Dynamic programming methods rely on a suitably defined value function that has to be computed for every state in the state space. However, many interesting problems involve very lar
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Riemer, Mark L. "Simulation of asset prices using Lévy processes." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/4926.

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Includes bibliographical references (leaves 93-97).<br>This dissertation focuses on a Lévy process driven framework for the pricing of financial instruments. The main focus of this dissertation is not, however, to price these instruments; the main focus is simulation based. Simulation is a key issue under Monte Carlo pricing and risk-neutral valuation- it is the first step towards pricing and therefore must be done accurately and with care. This dissertation looks at different kinds of Lévy processes and the various approaches one can take when simulating them.
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Haumann, David Roger. "Using behavioral simulation to animate complex processes /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487598748017362.

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Tucci, Fausto. "Modelling and numerical simulation of pultrusion processes." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/21263.

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Mestrado em Engenharia Mecânica<br>O objectivo deste trabalho prende-se com a modelação e análise por simulação numérica, através do Método dos Elementos Finitos, da distribuição de temperaturas (e sua evolução) durante reações de polimerização das resinas em compósitos sujeitos a processos de pultrusão. A modelação baseou-se numa abordagem quasi-estática num enquadramento tridimensional e a partir de pressupostos de base Eulerianos para as equações de evolução. A um modelo inicial termo-químico foi acoplado um modelo mecânico de equilíbrio, por forma a estimar por meio de simulação numérica o
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Yip, Kam-yuen William. "Simulation and inference of aggregated Markov processes." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13787391.

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