Дисертації з теми "Second order difference array"
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Cotterell, Philip S. "On the theory of second-order soundfield microphone." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250639.
Повний текст джерелаPellegrini, Joseph Charles. "Neural network emulation of temporal second order linear difference equations." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/42505.
Повний текст джерелаBasu, Sukanya. "Global behavior of solutions to a class of second-order rational difference equations /." View online ; access limited to URI, 2009. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3367987.
Повний текст джерелаPefferly, Robert J. "Finite difference approximations of second order quasi-linear elliptic and hyperbolic stochastic partial differential equations." Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/11244.
Повний текст джерелаTop, Can Baris. "Design Of A Slotted Waveguide Array Antenna And Its Feed System." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607642/index.pdf.
Повний текст джерелаBellew, Sarah Louise. "Investigation of the response of groups of wave energy devices." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/investigation-of-the-response-of-groups-of-wave-energy-devices(3db5db0d-a6af-4715-9f0b-19d53cf6dcf4).html.
Повний текст джерелаRevoredo, Igor Feliciano Simplicio. "Solução Numérica de escoamentos viscoelásticos tridimensionais com superfícies livres: fluidos de segunda ordem." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-18052010-161846/.
Повний текст джерелаThis work presents a finite difference method to simulate three-dimensional viscoelastic flow with free surfaces governed by the constitutive equation Second Order Fluid. The governing equations are solved by the finite difference method in a three-dimensional shifted mesh. The free surface of fluid is modeled by the Marker-and-Cell method which allows for the visualization and the location of the free surface of fluid. The full free surface stress conditions are employed. The numerical method developed in this work is validated by comparing the numerical and analytic solutions for the steady state flow of a Second Order Fluid in a pipe. By using mesh refinement convergence results are given. Numerical results of the simulation of the transient extrudate swell of a Second Order Fluid of the Deborah number De \'< OR =\' 0:3 are presented
Souza, Grazione de. "Modelagem computacional de escoamentos com duas e três fases em reservatórios petrolíferos heterogêneos." Universidade do Estado do Rio de Janeiro, 2008. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=711.
Повний текст джерелаConsidera-se neste trabalho um modelo matemático para escoamentos com duas e três fases em reservatórios petrolíferos e a modelagem computacional do sistema de equações governantes para a sua solução numérica. Os fluidos são imiscíveis e incompressíveis e as heterogeneidades da rocha reservatório são modeladas estocasticamente. Além disso, é modelado o fenômeno de histerese para a fase óleo via funções de permeabilidades relativas. No caso de escoamentos trifásicos água-óleo-gás a escolha de expressões gerais para as funções de permeabilidades relativas pode levar à perda de hiperbolicidade estrita e, desta maneira, à existência de uma região elíptica ou de pontos umbílicos para o sistema não linear de leis de conservação hiperbólicas que descreve o transporte convectivo das fases fluidas. Como conseqüência, a perda de hiperbolicidade estrita pode levar à existência de choques não clássicos (também chamados de choques transicionais ou choques subcompressivos) nas soluções de escoamentos trifásicos, de difícil simulação numérica. Indica-se um método numérico com passo de tempo fracionário, baseado em uma técnica de decomposição de operadores, para a solução numérica do sistema governante de equações diferenciais parciais que modela o escoamento bifásico água-óleo imiscível em reservatórios de petróleo heterogêneos. Um simulador numérico bifásico água-óleo eficiente desenvolvido pelo grupo de pesquisa no qual o autor está inserido foi modificado com sucesso para incorporar a histerese sob as hipóteses consideradas. Os resultados numéricos obtidos para este caso indicam fortes evidências que o método proposto pode ser estendido para o caso trifásico água-óleo-gás. A técnica de decomposição de operadores em dois níveis permite o uso de passos de tempo distintos para os quatro problemas definidos pelo procedimento de decomposição: convecção, difusão, pressão-velocidade e relaxação para histerese. O problema de transporte convectivo (hiperbólico) das fases fluidas é aproximado por um esquema central de diferenças finitas explícito, conservativo, não oscilatório e de segunda ordem. Este esquema é combinado com elementos finitos mistos, localmente conservativos, para a aproximação dos problemas de transporte difusivo (parabólico) e de pressão-velocidade (elíptico). O operador temporal associado ao problema parabólico de difusão é resolvido fazendo-se uso de uma estratégia implícita de solução (Backward Euler). Uma equação diferencial ordinária é resolvida (analiticamente) para a relaxação relacionada à histerese. Resultados numéricos para o problema bifásico água-óleo em uma dimensão espacial em concordância com resultados semi-analíticos disponíveis na literatura foram reproduzidos e novos resultados em meios heterogêneos, em duas dimensões espaciais, são apresentados e a extensão desta técnica para o caso de problemas trifásicos água-óleo-gás é proposta.
We consider in this work a mathematical model for two- and three-phase flow problems in petroleum reservoirs and the computational modeling of the governing equations for its numerical solution. We consider two- (water-oil) and three-phase (water-gas-oil) incompressible, immiscible flow problems and the reservoir rock is considered to be heterogeneous. In our model, we also take into account the hysteresis effects in the oil relative permeability functions. In the case of three-phase flow, the choice of general expressions for the relative permeability functions may lead to the loss of strict hyperbolicity and, therefore, to the existence of an elliptic region or umbilic points for the system of nonlinear hyperbolic conservation laws describing the convective transport of the fluid phases. As a consequence, the loss of hyperbolicity may lead to the existence of nonclassical shocks (also called transitional shocks or undercompressive shocks) in three-phase flow solutions. We present a new, accurate fractional time-step method based on an operator splitting technique for the numerical solution of a system of partial differential equations modeling two-phase, immiscible water-oil flow problems in heterogeneous petroleum reservoirs. An efficient two-phase water-oil numerical simulator developed by our research group was sucessfuly extended to take into account hysteresis effects under the hypotesis previously annouced. The numerical results obtained by the procedure proposed indicate numerical evidence the method at hand can be extended for the case of related three-phase water-gas-oil flow problems. A two-level operator splitting technique allows for the use of distinct time steps for the four problems defined by the splitting procedure: convection, diffusion, pressure-velocity and relaxation for hysteresis. The convective transport (hyperbolic) of the fluid phases is approximated by a high resolution, nonoscillatory, second-order, conservative central difference scheme in the convection step. This scheme is combined with locally conservative mixed finite elements for the numerical solution of the diffusive transport (parabolic) and the pressure-velocity (elliptic) problems. The time discretization of the parabolic problem is performed by means of the implicit Backward Euler method. An ordinary diferential equation is solved (analytically) for the relaxation related to hysteresis. Two-phase water-oil numerical results in one space dimensional, in which are in a very good agreement with semi-analitycal results available in the literature, were computationaly reproduced and new numerical results in two dimensional heterogeneous media are also presented and the extension of this technique to the case of three-phase water-oil-gas flows problems is proposed.
Ly, Peter Quoc Cuong. "Fast and unambiguous direction finding for digital radar intercept receivers." Thesis, 2013. http://hdl.handle.net/2440/90332.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2013
Li, Henian. "Asymptotic solutions of second order difference equations." 1991. http://hdl.handle.net/1993/18264.
Повний текст джерелаLUO, GUO-YAN, and 羅國彥. "Oscillation and comparison theorems for second order difference equations." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/99590130349449873957.
Повний текст джерелаLYU, XIAO-TONG, and 呂蕭同. "Growth and oscillation properties of second order difference inequalities." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/96469538591549200705.
Повний текст джерелаHsieh, Jer Ren, and 謝哲人. "Systolic Array For Second-order Kalman Filter Parallel Processing Design." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/76527076866509933184.
Повний текст джерела中原大學
資訊工程研究所
82
Kalman filter has been one of the most popular methods applied in the area of modern control, signal processing etc. But it can not process applications in real time , due to its complicated processing of matrix computations. The only way to extensive Kalman filter in real time processing is parallel processing. The goal of this paper is the parallizing processing of second-order Kalman filter. The second-order Kalman filter is to solve the second-order system state value , so must spend more computation. Systolic array can be made of VLSI chip, it has the advantage of processing great amount data. There are a lots of reseaches in first-order Kalman filter using systolic array. For the sake of parallelizing second-order Kalman filter, we analyze the dependency of the Kalman filter equation's data in advance. According to data dependency graphy. The ovelall design of implentention is partitioned into four stages. For reducing cost, we just design two kind of systolic array structures to process our second- order Kalman filter. When we arrange system structure, we use the concept of interarray pipelining, concurrent processing and the proper arrangment of equations to improve 19n^{3} computation time of sequential processing into 17n+5r-2. Using in the first-order Kalman filter, we need only 7n+5r-2. Since the matrix's dimension of the second-order is twice as that in the first-order system. Assume the dimension n=r, the computation time of the first-order and second-order are 12n-2 and 11n-2 respectively. Therefore the second-order Kalman filter is faster than the first-order filter. Our proposed mathod is faster than the first-order Kalman filter processing which has been proposed by Taylor and Liu. We propose this analytic structure which can be designed into VLSI chip. It can provide to various practical applications and will increase the efficiency and accuracy of the systems.
ZHANG, YU-ZHU, and 張玉珠. "Oscillation, boundedness and comparison theorem for second order nonlinear difference equation." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/62271736754554749067.
Повний текст джерелаChan, Chek-Yee, and 陳玦瑜. "Cubic Spline Difference Method for Second Order Linear Two Point y Value Problems." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/19094365131041527202.
Повний текст джерелаZHAO, YOU-GUANG, and 趙有光. "Oscillation and asymptotic behavior of solutions of a second order nonlinear difference equation." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/30355723074142505151.
Повний текст джерелаHuang, Po-Ying, and 黃柏穎. "Global attractor and topological chaos of second-order difference equations in discrete Hamiltonian systems." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/44498827261819052017.
Повний текст джерела國立交通大學
應用數學系所
99
In this thesis, we discuss two distinct dynamics of the difference equation ∆[p∆x(t-1)]+qx(t)=f(x(t-1)) or f(x(t)), t∈Z, where ∆x(t-1)=ax(t)-bx(t-1). These two dynamics are the behavior of globally attracting and topological chaos. We have several results. Under some conditions of a, b, p and q, every orbit of the equation asymptotically converges to a global attractor. See theorems 2.2 and 2.3. If there exists a function relating to f which has more than one simple zeros or positive topological entropy at an expected parametric value, then the shift map restricted to the set of solutions of this equation has topological chaos. See theorems 2.6, 2.7, 2.8 and 2.9. Finally, we transform this equation into a parameterized continuous function by changing variables. We can also write it as the form of a discrete Hamiltonian system. For the case f(x(t)), theorem 2.10 says that there exists a function relating to f which has positive topological entropy such that the corresponding function has topological chaos. For the case f(x(t-1)), with an additional assumption that the function relating to f is locally trapping, theorem 2.11 says that the corresponding function has also topological chaos.
"Numerical simulation of energy states for vertically aligned quantum dots array by second order finite dierence scheme." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0021-2004200714194254.
Повний текст джерелаVestal, Eric William. "Traveltime solution for the two dimensional Eikonal equation in an arbitrarily complex slowness field via first or second order conservative upwind difference formulations." Thesis, 1992. http://hdl.handle.net/1911/13647.
Повний текст джерелаAbolghasem, Payam. "Phase-matching Second-order Optical Nonlinear Interactions using Bragg Reflection Waveguides: A Platform for Integrated Parametric Devices." Thesis, 2011. http://hdl.handle.net/1807/29655.
Повний текст джерелаWagner, Sean. "Wavelength Conversion in Domain-disordered Quasi-phase Matching Superlattice Waveguides." Thesis, 2011. http://hdl.handle.net/1807/29903.
Повний текст джерелаIsmailova, Darya. "Localization algorithms for passive sensor networks." Thesis, 2016. http://hdl.handle.net/1828/7747.
Повний текст джерелаGraduate
0544
ismailds@uvic.ca
Taheri, Bonab Peyman. "Macroscopic description of rarefied gas flows in the transition regime." Thesis, 2010. http://hdl.handle.net/1828/3018.
Повний текст джерела