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Dissertations / Theses on the topic 'Enclosure methods'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

Smith, Andrew Paul [Verfasser]. "Enclosure Methods for Systems of Polynomial Equations and Inequalities / Andrew Paul Smith." Konstanz : Bibliothek der Universität Konstanz, 2012. http://d-nb.info/1028327854/34.

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2

ZHANG, YAFAN. "Experimental and CFD Evaluation of Humidity Management Methods of Ruggedizing a COTS Electronics System for a Severe Climatic Environment." Thesis, Jönköping University, JTH, Computer and Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-1647.

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<p><p>This master thesis is about an investigation of anti-moisture methods for a nonhermeticelectronics enclosure containing a number of printed circuit boards(PCB) and placed in a severe climatic environment.</p><p>The relevant theoretical background was provided first. It included the impact of moisture on electronics, some useful psychrometrics concepts, heat transfer fundamentals, introduction of environmental test, temperature and humiditysensing techniques, computational fluid dynamics (CFD) modelling, antimoisture methods and commercial heaters in the current marketing.</p><p>Then a CF

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3

Testa, Samuele. "Airflow fields analysis in bounded domains with CFD methods." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423590.

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In the current work the focus is on natural ventilation occurring in buildings. The first step is to discuss the potential of numerical models applied to determine building performance and air flow as part of a mixed mode building control scheme with respect to a test case. A dynamic simulation software (TRNSYS) is used to estimate the annual energy demand. An optimization program (GenOpt) changes iteratively the parameters regulating the airflow within the building model in order to minimize the whole year energy use. Elements which are considered in the analysis are outdoor climatic conditio

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4

Fogelklou, Oswald. "Computer-Assisted Proofs and Other Methods for Problems Regarding Nonlinear Differential Equations." Doctoral thesis, Uppsala universitet, Analys och tillämpad matematik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-161314.

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This PhD thesis treats some problems concerning nonlinear differential equations. In the first two papers computer-assisted proofs are used. The differential equations there are rewritten as fixed point problems, and the existence of solutions are proved. The problem in the first paper is one-dimensional; with one boundary condition given by an integral. The problem in the second paper is three-dimensional, and Dirichlet boundary conditions are used. Both problems have their origins in fluid dynamics. Paper III describes an inverse problem for the heat equation. Given the solution, a solution

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5

Spa, Carvajal Carlos. "Time-domain numerical methods in room acoustics simulations." Doctoral thesis, Universitat Pompeu Fabra, 2009. http://hdl.handle.net/10803/7565.

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L'acústica de sales s'encarrega de l'estudi del comportament de les ones sonores en espais tancats.La informació acústica de qualsevol entorn, coneguda com la resposta impulsional, pot ser expressada en termes del camp acústic com una funció de l'espai i el temps. En general, és impossible obtenir solucions analítiques de funcions resposta en habitacions reals. Per tant, en aquests últims anys, l'ús d'ordinadors per resoldre aquest tipus de problemes ha emergit com una solució adecuada per calcular respostes impulsionals.<br/>En aquesta Tesi hem centrat el nostre anàlisis en els mètodes basat

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6

Cheung, Kai Tak (Franco). "Development and Testing of a Method for Forecasting Prices of Multi-Storey Buildings during the Early Design Stage: the Storey Enclosure Method Revisited." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16046/1/Franko_Cheung_Thesis.pdf.

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Although design decisions that are made in the preliminary design stages of a building are more cost sensitive than those that are made at later stages, previous research suggests that they result in only a slight improvement in the accuracy of building price forecasts as the design develops. However, established conventional forecasting methods lack measures of their own performance, which has inhibited the development of simpler early-stage techniques. One early-stage price forecasting model, the Storey Enclosure Method, which was developed by James in 1954, uses the basic physical m

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7

Cheung, Kai Tak (Franco). "Development and Testing of a Method for Forecasting Prices of Multi-Storey Buildings during the Early Design Stage: the Storey Enclosure Method Revisited." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16046/.

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Although design decisions that are made in the preliminary design stages of a building are more cost sensitive than those that are made at later stages, previous research suggests that they result in only a slight improvement in the accuracy of building price forecasts as the design develops. However, established conventional forecasting methods lack measures of their own performance, which has inhibited the development of simpler early-stage techniques. One early-stage price forecasting model, the Storey Enclosure Method, which was developed by James in 1954, uses the basic physical measureme

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8

Layos, Aaron J. "Active control methods for improving the insertion loss of acoustical enclosures." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-05022009-040407/.

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9

Carter, Amy Elizabeth. "DESIGN OF PARTIAL ENCLOSURES FOR ACOUSTICAL APPLICATIONS." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_theses/356.

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Enclosures are a very common way to reduce noise emissions from machinery. However, enclosures display complex acoustic behavior that is difficult to predict. The research presented in this thesis uses the boundary element method in order to better understand the acoustic behavior of a partial enclosure. Insertion loss was used as the performance measure and the effect of several design factors on the overall insertion loss was documented. Results indicate that the most important factors affecting enclosure performance are the opening size, amount of absorption, and the source-to-opening dista

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10

Gravelle, Luc B. "Shielding effectiveness of enclosures predicted via the finite element method." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5950.

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This thesis presents the application of the numerical finite element method (FEM) in solving the electromagnetic shielding effectiveness of enclosures. The emphasis is placed on the solution of time-dependant varying fields, as for example an NEMP or a digital signal, directly in the time domain. Previous numerical prediction of shielding effectiveness on complicated structures have been analyzed with the FEM in the frequency domain whereas no study, to the author's knowledge, has been conducted in the time domain. EMP type varying fields impinging on enclosures are studied with this new CAD t

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11

Paoletti, Umberto [Verfasser]. "Conjugate Gradient Methods for Simulation of Electromagnetic Radiation from Rectangular Enclosures / Umberto Paoletti." Aachen : Shaker, 2005. http://d-nb.info/1186578556/34.

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12

Yao, Huafu. "Studies of natural convection in enclosures using the finite volume method." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0007/NQ42781.pdf.

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13

Rouse, Jerry Wayne. "Energy-Based Boundary Element Method for High-Frequency Broadband Sound Fields in Enclosures." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000911-161316.

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<p>This work sets forth a new method for predicting the spatialvariation of mean square pressure within two-dimensionalenclosures containing high-frequency broadband sound fieldsand light to moderate absorption. In the new method, theenclosure boundaries are replaced by a continuousdistribution of broadband uncorrelated sources, each ofwhich provides a constituent field expressed in terms ofmean square pressure and time average intensity variables.Superposition of these fields leads to the overall meansquare pressure and time average intensity as a function ofposition. Boundary conditions for

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14

Calton, Matthew Franklin. "Modeling of Acoustic Resonators and Resonator Systems for Use in Passive Noise Control." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/9261.

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Acoustic resonators, such as the Helmholtz and quarter-wave resonator, can be used to attenuate unwanted noise in an enclosed space. Classical formulations can be used to approximate resonator performance for a given resonator configuration, but may lack sufficient accuracy for some applications. This research aims to improve the analytical characterization of resonators to provide better correlation to experimental results. Using higher-order approximations and proper end corrections, more accuracy can be obtained in calculating the impedance and resonance frequency of a single resonator,

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15

Jensen, Zachary R. "Improvements to the Two-Point In Situ Method for Measurement of the Room Constant and Sound Power in Semi-Reverberant Rooms." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5724.

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The two-point in situ method is a technique for measuring the room constant of a semi-reverberant room and the sound power of a source in that room simultaneously using two measurement positions. Using a reference directivity source, where the directivity factor along any given axis of the source has been measured, one is able to use the Hopkins-Stryker equation to measure both the room constant and the sound power level of another source rather simply. Using both numerical and experimental data, it was found that by using generalized energy density (GED) as a measurement quantity, the resul

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16

Demirkaya, Gokmen. "Monte Carlo Solution Of A Radiative Heat Transfer Problem In A 3-d Rectangular Enclosure Containing Absorbing, Emitting, And Anisotropically Scattering Medium." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1059138/index.pdf.

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In this study, the application of a Monte Carlo method (MCM) for radiative heat transfer in three-dimensional rectangular enclosures was investigated. The study covers the development of the method from simple surface exchange problems to enclosure problems containing absorbing, emitting and isotropically/anisotropically scattering medium. The accuracy of the MCM was first evaluated by applying the method to cubical enclosure problems. The first one of the cubical enclosure problems was prediction of radiative heat flux vector in a cubical enclosure containing purely, isotropically and anis

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17

He, Shujian. "A TRANSFER MATRIX APPROACH TO DETERMINE THE LOW FREQUENCY INSERTION LOSS OF ENCLOSURES INCLUDING APPLICATIONS." UKnowledge, 2017. https://uknowledge.uky.edu/me_etds/104.

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Partial enclosures are commonly used to reduce machinery noise. However, it is well known in industry that enclosures sometimes amplify the sound at low frequencies due to strong acoustic resonances compromising the performance. These noise issues are preventable if predicted prior to prototyping and production. Though boundary and finite element approaches can be used to accurately predict partial enclosure insertion loss, modifications to the model require time for remeshing and solving. In this work, partial enclosure performance at low frequencies is simulated using a plane wave transfer m

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18

Patier, Laurent. "Etude de techniques de calculs multi-domaines appliqués à la compatibilité électromagnétique." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00834164.

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Le contexte d'étude est celui de la Compatibilité ÉlectroMagnétique (CEM). L'objectif de la CEM est, comme son nom l'indique, d'assurer la compatibilité entre une source de perturbation électromagnétique et un système électronique victime. Or, la prédiction de ces niveaux de perturbation ne peut pas s'effectuer à l'aide d'un simple calcul analytique, en raison de la géométrie qui est généralement complexe pour le système que l'on étudie, tel que le champ à l'intérieur d'un cockpit d'avion par exemple. En conséquence, nous sommes contraints d'employer des méthodes numériques, dans le but de pré

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19

Joldes, Mioara Maria. "Approximations polynomiales rigoureuses et applications." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2011. http://tel.archives-ouvertes.fr/tel-00657843.

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Quand on veut évaluer ou manipuler une fonction mathématique f, il est fréquent de la remplacer par une approximation polynomiale p. On le fait, par exemple, pour implanter des fonctions élémentaires en machine, pour la quadrature ou la résolution d'équations différentielles ordinaires (ODE). De nombreuses méthodes numériques existent pour l'ensemble de ces questions et nous nous proposons de les aborder dans le cadre du calcul rigoureux, au sein duquel on exige des garanties sur la précision des résultats, tant pour l'erreur de méthode que l'erreur d'arrondi.Une approximation polynomiale rigo

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20

Anguelov, Roumen Anguelov. "Aspects of interval analysis applied to initial-value problems for ordinary differential equations and hyperbolic partial differential equations." Thesis, 1998. http://hdl.handle.net/10500/17723.

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Interval analysis is an essential tool in the construction of validated numerical solutions of Initial Value Problems (IVP) for Ordinary (ODE) and Partial (PDE) Differential Equations. A validated solution typically consists of guaranteed lower and upper bounds for the exact solution or set of exact solutions in the case of uncertain data, i.e. it is an interval function (enclosure) containing all solutions of the problem. IVP for ODE: The central point of discussion is the wrapping effect. A new concept of wrapping function is introduced and applied in studying this effect. It is proved

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21

Liang, J. "Tangram treemaps : an enclosure geometrical partitioning method with various shapes." Thesis, 2012. http://hdl.handle.net/10453/33100.

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University of Technology, Sydney. Faculty of Engineering and Information Technology.<br>In practices, analysts need to monitor multiple views and real time processes in one physical screen simultaneously regularly, due to the time demands or multi-task requirements. More often the visualization tool shares the screen space with other concurrent projects or process sessions. Although the traditional enclosure (or space-filling) tree approach can guarantee the maximization of space utilization in an isolated session display (that commonly occupies a single rectangular geometrical area), they how

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22

YANG, TSANG-CHIANG, and 楊長江. "On Implementation of Optimization and Numerical Analysis Method for Noise Control in Enclosure." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/11486735793584203430.

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23

Liu, Ming-ho, and 劉明和. "Study on Natural Convection in Differentially Heated Micro-Enclosure Systems Using DSMC Method." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/06488903634741537005.

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博士<br>國防大學中正理工學院<br>國防科學研究所<br>93<br>Fluid motion driven by thermal gradients is a common and important phenomenon in nature, as well as in numerous engineering applications such as meteorology, geophysics, astrophysics, solar energy collectors, crystal growth for microprocessors, cryogenic storage, heat exchangers, as well as multilayer walls and double windows in buildings. In addition to these applications, it can also be employed to analyze fluid hydrodynamic instability, bifurcation, self-organization, and chaotic behavior in fluids. The field of microelectromechanical systems (MEMS) has

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24

LAN, YUAN-LONG, and 藍元隆. "Study of sound reverberation in enclosures using eigenanalysis based on boundary element method." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/14366052330179909789.

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25

Chang, Chun-Te, and 張俊德. "The Study of Impulse Response in Three-Dimensional Enclosure Sound Field Using Boundary Integral Equation Method." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/66358707279752393677.

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碩士<br>國立海洋大學<br>造船工程學系<br>86<br>The aim of this dissertation is to develop anumerical method for impulse response calculation in three-dimensional enclosure sound field. A greater emphasis focus on the boundary integral equation instead of experiments for impulse response.Ten octavebands summation are proposed to simulate anlsδ(t) at a point, and the band summation(or a single band) so simulated is then transformed to a input sources of frequency domain by Fourier Transform (FT). The bounda

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26

Lee, Wei-Kuo, and 李維國. "Improved Equivalent Transmission Line Method for the Shielding Effectiveness of Metal Enclosures with Apertures." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/64673878964128021335.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>94<br>Because the metal enclosure with apertures is the structure of the cavity form, FDTD method belonging to full-wave analytical algorithm isn’t efficient for analyzing such case. Thereby the ETL method belonging to analytical formulation provides another way to analyze it. Although the structure which it can apply to isn’t as complex as that in full-wave analytical algorithm, the computing time is shorter than FDTD. In contrast, the method can’t get good agreement. Thus two improved ways are introduced in this paper. One is to make the suitable structure wider

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27

Jen-Shuo, Hsu, and 許仁碩. "Natural Convection in a Two-dimensional Enclosure for Various Aspect Ratio using Moving Particle Method with Pressure Meshes." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/55987249132831615525.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>100<br>In this study, a brand new moving particle method is applied to the problem of natural convection in a cavity with rectangular configuration. The numerical characteristics of this method are also extensively studied. The fixed pressure grid provides more precise evaluations on the pressure-related operating terms occurring in governing equations, since the fact has shown that the behavior in pressure is not the type of convection. Therefore, difference form of pressure derived by the present formulation is more precise than the traditional moving particle

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28

Michalis, Krista. "Modeling Specular and Diffuse Reflection Sound Fields in Enclosures with an Energy-Intensity Boundary Element Method." Diss., 2011. http://hdl.handle.net/10161/4997.

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<p>Steady-state sound fields in enclosures, with specular and diffuse reflection boundaries, are modeled with a first-principle energy-intensity boundary element method using uncorrelated broadband directional sources. The specular reflection field is represented by a limited set of spherical harmonics that are orthogonal on the half-space. The amplitudes of these harmonics are determined by a Lagrange multiplier method to satisfy the energy conservation integral constraint. The computational problem is solved using an iterative relaxation method starting from the 3-D diffuse reflection soluti

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29

Hung, Kuo-Shu, and 洪國書. "Numerical Method for Analysis of Thermal and Flow Fields of Compressible Flow in an Enclosure with Periodically Moving Boundary." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/77261804017888908369.

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博士<br>大同大學<br>機械工程學系(所)<br>94<br>The aim of this thesis is to develop a numerical method for analysis of thermal and flow fields of compressible flow in an enclosure with periodically moving boundary. The combined influence of the partitions, movement of the walls, and the buoyancy as well on the flow pattern and heat transfer performance is evaluated. The two-stage pressure correction scheme is developed and modified for simultaneously determining the distributions of absolute pressure, density, temperature, and velocity of the compressible flow field in the enclosure during the start-up and

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30

Jena, Prabir kumar. "Analysis of Combined Conductive and Radiative Heat Transfer in a Two Dimensional Square Enclosure using the Finite Volume Method." Thesis, 2009. http://ethesis.nitrkl.ac.in/1480/1/Prabir.pdf.

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An efficient tool to deal with multidimensional radiative heat transfer is in strong demand to analyse the various thermal problems combined either with other modes of heat transfer or with combustion phenomena. Combined conduction and radiation heat transfer without heat generation is investigated. Analysis is carried out for both steady and unsteady situations. Two-dimensional gray Cartesian enclosure with an absorbing, emitting, and isotropically scattering medium is considered. Enclosure boundaries are assumed at specified temperature. The finite volume method is used to solve the energy

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31

Lin, Yi-Hsuan, and 林奕亘. "The development of the Enclosure Method in an Anisotropic Background and the Strong Unique Continuation for the Elasticity with Residual Stress." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/82657710381302501626.

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博士<br>國立臺灣大學<br>數學研究所<br>104<br>The goal of this dissertation is to develop reconstruction schemes to determine penetrable and impenetrable obstacles in a region in 3-dimensional in an anisotropic background. We demonstrate the enclosure-type method for two different mathematical models: The anisotropic elliptic equation and the anisotropic Maxwell system. So far, in the anisotropic case, there are no complex geometrical optics solutions which we can use to reconstruct the unknown obstacles in a given medium. Therefore, we use another special type solution: the oscillating decaying solutions,

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32

Lin, Yan-Cheng, and 林彥丞. "Thermosolutal convectiont transfer in inclined enclosures with double partitions of the sherwood number for taguchi method and simulate analyze research." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/85953699958073225320.

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碩士<br>桃園創新技術學院<br>機械工程系機械與機電工程碩士班<br>104<br>The current study is primarily motivated to gain better understanding of the flow pattern, the temperature distribution and concentration distribution caused by thermosolutal convection in an electrochemical system with a partially divided enclosure. The test cell is an inclined rectangular enclosure formed with acrylic and copper plates, which is wrapped with foam insulator to ensure an adiabatic boundary condition, and its aspect ratio is 1 . The temperature is maintained uniform and controlled by two separated constant temperature baths, which cir

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33

Chen, Hsin-Hung, and 陳欣鴻. "Thermosolutal convection transfer in inclined enclosures with middle partitions of the Sherwood number for taguchi method and simulate analyze research." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/04748840093623850902.

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碩士<br>元智大學<br>機械工程學系<br>104<br>The current study is primarily motivated to gain better understanding of the flow pattern, the temperature distribution and concentration distribution caused by thermosolutal convection in an electrochemical system with a partially divided enclosure. The test cell is an inclined rectangular enclosure formed with acrylic and copper plates, which is wrapped with foam insulator to ensure an adiabatic boundary condition, and its aspect ratio is 2.0 . The temperature is maintained uniform and controlled by two separated constant temperature baths, which circulate heat

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34

Guo, Huang-Huei, and 郭鍠輝. "The study of sound pressure distribution of three dimensional enclosure based on a Time Domain Boundary Element Method with a new time interval algorithm." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/59871176734652250541.

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碩士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>93<br>The aim of this dissertation is to develop a time domain acoustic computation theory, which is calculating the sound pressure distribution of three dimensional enclosure for boundary integral equation with a new time interval algorithm. In order to ensure the accuracy of the boundary integral program compared with the image method for a three dimensional enclosed source field. Based on the equation developed are a calculation procedure BIE for the direct sound and the first reflected sound, and a time domain boundary element method (BEM) for calculating the

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35

Moreno, Rafael. "Object-oriented implementation of the Galerkin finite element method and its application to the numerical study of natural convective flows in enclosures." Thesis, 1997. http://hdl.handle.net/1911/19189.

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Using object-oriented programming (OOP) techniques and philosophies, a collection of C++ tools for the rapid development of finite element applications has been created. The Object-Oriented Finite Element Analysis (OOFEA) toolkit provides both the geometrical and mathematical management tools necessary for this task in the form of useful class hierarchies, in particular, the OOFEA toolkit features methods for evaluating arbitrary weak forms provided by the user in order to solve particular problems of interest. A detailed description of the underlying concepts, philosophies and techniques used

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36

Grunwald, Susanne. "Zur Wechselwirkung zwischen ethnischer Deutung und archäologischer Methode am Beispiel der ur- und frühgeschichtlichen Wallanlagen in Sachsen." 2003. https://ul.qucosa.de/id/qucosa%3A34009.

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Diese forschungsgeschichtliche Arbeit stellt die Methoden, Ergebnisse und gesellschaftlichen Verflechtungen der archäologischen Burgwallforschung in Sachsen im 19. Jahrhundert bis 1872 dar. Dafür wurden publizierte Burgwallgrabungen und allgemein altertumskundliche Darstellungen ausgewertet.

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