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Дисертації з теми "Transfer Volume"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Praßni, Jörg-Stefan, Timo Ropinski, Jörg Mensmann, and Klaus Hinrichs. "Shape-based Transfer Functions for Volume Visualization." University of Münster, Germany, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-93039.

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We present a novel classification technique for volume visualization that takes the shape of volumetric features into account. The presented technique enables the user to distinguish features based on their 3D shape and to assign individual optical properties to these. Based on a rough pre-segmentation that can be done by windowing, we exploit the curve-skeleton of each volumetric structure in order to derive a shape descriptor similar to those used in current shape recognition algorithms. The shape descriptor distinguishes three main shape classes: longitudinal, surface-like, and blobby shape

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2

Rudd, Christopher. "Preform processing for high volume resin transfer moulding (RTM)." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543834.

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3

Alsterman, Marcus. "Transfer Learning for Sales Volume Forecasting Using Convolutional Neural Networks." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-255007.

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Improved time series forecasting accuracy can enhance demand planning, and therefore save money and reduce environmental impact. The idea behind this degree project is to explore transfer learning for time series forecasting. This has boiled down to two concrete goals. The first one is to examine if transfer learning can improve the forecasting accuracy when using a convolutional neural network (CNN) with dilated causal convolutions. The second goal is to investigate whether transfer learning makes it possible to forecast time series with less historical data.In this project, time series descr

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4

Maza, William Antonio. "Reaction Enthalpy and Volume Profiles for Excited State Reactions Involving Electron Transfer and Proton-Coupled Electron Transfer." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4539.

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Electron transfer, ET, and proton-coupled electron transfer, PCET, reactions are central to biological reactions involving catalysis, energy conversion and energy storage. The movement of electrons and protons in either a sequential or concerted manner are coupled in a series of elementary reaction steps in respiration and photosynthesis to harvest and convert energy consumed in foodstuffs or by absorption of light into high energy chemi-cal bonds in the form of ATP. These electron transfer processes may be modulated by conformational dynamics within the protein matrix or at the protein-protei

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5

Bernardon, Fabio Fedrizzi. "Function statistics applied to volume rendering : transfer functions design and computational issues on discrete functions." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/16654.

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Анотація:

O projeto de funções de transferência é um interessante problema que recebe muita atenção da comunidade de visualização. Diversas pesquisas tem sido conduzidas para criar melhores ferramentas e técnicas que trabalham com dados volumétricos. Existem duas grandes classes de dados: volumes estruturados e volumes não-estruturados. A maioria dos trabalhos anteriores apenas se refere a dados estruturados. Este trabalho possui dois grupos de contribuições. O primeiro diz respeito ao problema clássico de especificação de funções de transferência. Primeiramente é desenvolvido o conceito de Ensembles, q

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6

Shareef, Naeem O. "Remote user-driven exploration of large scale volume data." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1117599341.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xvii, 104 p.; also includes graphics (some col.) Includes bibliographical references (p. 94-104). Available online via OhioLINK's ETD Center

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7

Wei, Zhiyong. "Thermo-fluid modeling and robust control of modern optic fiber drawing processes." Diss., Available online, Georgia Institute of Technology, 2004, 2004. http://etd.gatech.edu/theses/available/etd-04092004-135913/unrestricted/wei%5Fzhiyong%5F200405%5Fphd.pdf.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2004.<br>Kok-Meng Lee, Committee Chair ; Andrei G. Fedorov, Committee Member ; William E. Singhose, Committee Member ; David G. Taylor, Committee Member ; Zhi Zhou, Committee Member. Includes bibliographical references.

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8

Belisio, Adriano Silva. "Simula??o da transfer?ncia de calor em amostras aquecidas por plasma." Universidade Federal do Rio Grande do Norte, 2007. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15522.

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Made available in DSpace on 2014-12-17T14:57:38Z (GMT). No. of bitstreams: 1 AdrianoSB.pdf: 1824941 bytes, checksum: 9594a533193a54f04b78499b7820f209 (MD5) Previous issue date: 2007-07-30<br>The processing of materials through plasma has been growing enough in the last times in several technological applications, more specifically in surfaces treatment. That growth is due, mainly, to the great applicability of plasmas as energy source, where it assumes behavior thermal, chemical and/or physical. On the other hand, the multiplicity of simultaneous physical effects (thermal, chemical and physi

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9

Lindfors, Lisa, and Hanna Lindmark. "Graphical User Interfaces for Volume Rendering Applications in Medical Imaging." Thesis, Linköping University, Department of Science and Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1120.

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<p>Volume rendering applications are used in medical imaging in order to facilitate the analysis of three-dimensional image data. This study focuses on how to improve the usability of graphical user interfaces of these systems, by gathering user requirements. This is achieved by evaluations of existing systems, together with interviews and observations at clinics in Sweden that use volume rendering to some extent. The usability of the applications of today is not sufficient, according to the users participating in this study. This is due to a wide range of reasons. One reason is that the graph

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10

Mujanayi, Katumba Jean-Marc. "Thermal management and optimisation of heat transfer from discrete heat sources." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/61318.

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Анотація:

These days, the cooling of new generation electronic servers is a challenge due to the immense heat generated by them. In order to avoid overheating caused by the important rise in temperature appropriate cooling procedures must be used in order to meet the thermal requirement. The current study aims at addressing the issue of overheating in this field, and focuses on the thermal management of electronic devices modelled as a discrete heat sources (mounted in a rectangular cavity) with uniform heat flux applied from the bottom. A review of the literature published regarding the convectiv

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11

Liu, Bingchen, Burkhard Wuensche, and Timo Ropinski. "Visualization by Example - A Constructive Visual Component-Based Interface for Direct Volume Rendering." University of Auckland, New Zealand, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-93201.

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The effectiveness of direct volume rendered images depends on finding transfer functions which emphasize structures in the underlying data. In order to support this process, we present a spreadsheet-like constructive visual component-based interface, which also allows novice users to efficiently find meaningful transfer functions. The interface uses a programming-by-example style approach and exploits the domain knowledge of the user without requiring visualization knowledge. Therefore, our application automatically analysis histograms with the Douglas-Peucker algorithm in order to identify po

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12

Joubert, Johannes Christoffel. "Influence of a magnetic field on magnetic nanofluids for the purpose of enhancing natural convection heat transfer." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/61298.

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Natural convection as a heat transfer mechanism plays a major role in the functioning of many heat transfer devices, such as heat exchangers, energy storage, thermal management and solar collectors. All of these have a large impact on the generation of solar power. Considering how common these devices are not only in power generation cycles, but in a majority of other thermal uses it is clear that increased performance for natural convection heat transfer will have consequences of a high impact. As such, the purpose of this study is to experimentally study the natural convection heat trans

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13

Nam, Kyung Moon. "Modeling Terahertz Diffuse Scattering from Granular Media Using Radiative Transfer Theory." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/380.

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Terahertz (THz) spectroscopy can potentially be used to probe and characterize inhomogeneous materials, however spectroscopic identification of such materials from spectral features of diffuse returns is a relatively underdeveloped area of study. In this thesis, diffuse THz scattering from granular media is modeled by applying radiative transfer (RT) theory for the first time in THz sensing. Both classical RT theory and dense media radiative transfer (DMRT) theory based on the quasi-crystalline approximation (QCA) are used to calculate diffuse scattered intensity. The numerical solutions of th

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14

Goldin, Jonathan Gerald. "Spirometric and gas transfer measurements among normal adult South African men : an investigation into anthropoemtric, socio-economic, racial and environmental factors influencing lung function." Doctoral thesis, Faculty of Health Sciences, 1989. https://hdl.handle.net/11427/31982.

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An investigation into anthropocentric, socio-economic, racial and environmental factors influencing lung function. In modern clinical practice the data derived from pulmonary function tests are an integral part of the evaluation of pulmonary disease states. Such data may shed light on the nature of the disease state, the extent (severity) of the disease and the degree of functional impairment that is present. It is generally recognized that there is a lack of consistent data regarding "normal" values in pulmonary function. Despite great progress in standardizing instrumentation, methodology a

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15

Hayton, T. "An investigation of magnetization transfer ratio and T1 hypointense lesion volume in secondary progressive multiple sclerosis." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1362888/.

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The data presented in this thesis were collected as part of a trial of neuroprotection with lamotrigine in secondary progressive multiple sclerosis (MS) and comprise clinical assessment and quantitative magnetic resonance imaging (MRI), specifically focussing on T1 hypointense lesion volume (T1LV) and magnetization transfer ratio (MTR). The aim of the study was to evaluate the usefulness of these MRI techniques for monitoring neuropathology in MS by examining the correlation of MRI measures with clinical measures both cross-sectionally and longitudinally and the responsiveness to change of the

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16

Othberg, Fredrik. "Standardized Volume Rendering Protocols for Magnetic Resonance Imaging using Maximum-Likelihood Modeling." Thesis, Linköping University, Department of Science and Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6211.

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<p>Volume rendering (VRT) has been used with great success in studies of patients using computed tomography (CT), much because of the possibility of standardizing the rendering protocols. When using magnetic resonance imaging (MRI), this procedure is considerably more difficult, since the signal from a given tissue can vary dramatically, even for the same patient. This thesis work focuses on how to improve the presentation of MRI data by using VRT protocols including standardized transfer functions. The study is limited to exclusively examining data from patients with suspected renal artery st

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17

Shin, Yoon Shik. "Modifications to a two-control-volume, frequency dependent, transfer-function analysis of hole-pattern gas annular seals." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/4751.

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A rotordynamic analysis of hole-pattern gas annular seals using a two-control-volume model, Ha and Childs and frequency dependent transfer-function model, Kleynhans and Childs is modified with four features. The energy equation is added, and real gas properties are used instead of the ideal gas equation of state. The depth of the hole-pattern is made variable with the axial distance along the seal. And last, the addition of deep grooves to hole-pattern seals is analyzed, and the codeÃ¢ÂÂs predictions for the influence of a groove are compared with test data.

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18

Venditti, David A. "An h-adaptive control-volume finite element method for steady, two-dimensional fluid flow and heat transfer." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0027/MQ50671.pdf.

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19

Hookey, Neil A. (Neil Alexander). "Evaluation and enhancements of control-volume finite-element methods for two-dimensional fluid flow and heat transfer." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66152.

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20

Venditti, David A. "An h-adaptive control-volume finite element method for steady, two-dimensional fluid flow and heat transfer /." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21332.

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An unstructured-grid, h-adaptive control-volume finite element method (CVFEM) was formulated, implemented, and tested for the simulation of steady, viscous, incompressible fluid flow and heat transfer in arbitrarily shaped two-dimensional domains. The h-adaptive procedure is based on a posteriori error estimation using a superconvergent recovery or smoothing technique. The CVFEM is based on a co-located, equal-order formulation that deals directly with the primitive variables. A set of sufficient conditions is presented for guaranteeing that the algebraic approximations to the diffusion terms

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21

Fleischer, Mario, Alexander Mainka, Steffen Kürbis, and Peter Birkholz. "How to precisely measure the volume velocity transfer function of physical vocal tract models by external excitation." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-234483.

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Recently, 3D printing has been increasingly used to create physical models of the vocal tract with geometries obtained from magnetic resonance imaging. These printed models allow measuring the vocal tract transfer function, which is not reliably possible in vivo for the vocal tract of living humans. The transfer functions enable the detailed examination of the acoustic effects of specific articulatory strategies in speaking and singing, and the validation of acoustic plane-wave models for realistic vocal tract geometries in articulatory speech synthesis. To measure the acoustic transfer functi

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22

Finkbeiner, David L. "Calculation of gas-wall heat transfer from pressure and volume data for spaces with inflow and outflow." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-12042009-020320/.

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23

Ljung, Patric. "Efficient Methods for Direct Volume Rendering of Large Data Sets." Doctoral thesis, Norrköping : Department of Science and Technology, Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7232.

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24

Bahaidarah, Haitham M. S. "A numerical study of heat and momentum transfer over a bank of flat tubes." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2782.

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The present study considers steady laminar two-dimensional incompressible flow over both in-line and staggered flat tube bundles used in heat exchanger applications. The effects of various independent parameters, such as Reynolds number (Re), Prandtl number (Pr), length ratio (L/Da), and height ratio (H/Da), on the pressure drop and heat transfer were studied. A finite volume based FORTRAN code was developed to solve the governing equations. The scalar and velocity variables were stored at staggered grid locations. Scalar variables (pressure and temperature) and all thermophysical properties

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25

Lundström, Claes. "Efficient Medical Volume Visualization : An Approach Based on Domain Knowledge." Doctoral thesis, Linköpings universitet, Visuell informationsteknologi och applikationer, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9561.

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Анотація:

Direct Volume Rendering (DVR) is a visualization technique that has proved to be a very powerful tool in many scientific visualization applications. Diagnostic medical imaging is one domain where DVR could provide clear benefits in terms of unprecedented possibilities for analysis of complex cases and highly efficient work flow for certain routine examinations. The full potential of DVR in the clinical environment has not been reached, however, primarily due to limitations in conventional DVR methods and tools. This thesis presents methods addressing four major challenges for DVR in clinical u

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26

Miranda, Bruno Monte Da Silva. "A numerical study of convection in a channel with porous baffles." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1612.

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The effects on heat transfer in a two-dimensional parallel plate channel with sixteen porous baffles in a staggered arrangement with a uniform heat flux heating applied to the top and bottom walls has been numerically investigated. Developing Flow (DF) was considered for this study. The Brinkman-Forchheimer-extended Darcy model was used for modeling the heat transfer and fluid flow through the porous baffles. The flow was assumed to be laminar. A finite volume based method in conjunction with the SIMPLEC algorithm was used to solve the model equations. Calculations were made by varying several

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27

Dickens, Erik. "Towards automatic detection and visualization of tissues in medical volume rendering." Thesis, Linköping University, Department of Science and Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9800.

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<p>The technique of volume rendering can be a powerful tool when visualizing 3D medical data sets. Its characteristic of capturing 3D internal structures within a 2D rendered image makes it attractive in the analysis. However, the applications that implement this technique fail to reach out to most of the supposed end-users at the clinics and radiology departments of today. This is primarily due to problems centered on the design of the Transfer Function (TF), the tool that makes tissues visually appear in the rendered image. The interaction with the TF is too complex for a supposed end-user a

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28

You, Lishan. "Computational Modeling of Laminar Swirl Flows and Heat Transfer in Circular Tubes with Twisted-Tape Inserts." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1029525889.

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29

Kramer, Tyler Christian. "The Polarimetric Impulse Response and Convolutional Model for the Remote Sensing of Layered Vegetation." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/41732.

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To date, there exists no complete, computationally efficient, physics-based model to compute the radar backscatter from forest canopies. Several models attempt to predict the backscatter coefficient for random forest canopies by using the Vector Radiative Transfer (VRT) Theory with success, however, these models often rely on purely time-harmonic formulations and approximations to integrals. Forms of VRT models have recently been developed which account for a Gaussian pulse incident waveform, however, these models often rely heavily on very specific and obfuscated approximations to solve the

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30

Sjölinder, Emil. "Spray and Wall Film Modeling with Conjugate Heat Transfer in OpenFOAM." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-84487.

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This master thesis was provided by Scania AB. The objective of this thesis was to modify an application in the free Computational Fluid Dynamics software OpenFOAM to be able to handle spray and wall film modeling of a Urea Water Solution together with Conjugate Heat Transfer. The basic purpose is to widen the knowledge of the vaporization process of a Urea Water Solution in the exhaust gas after treatment system for a diesel engine by using OpenFOAM. First, urea has been modeled as a very viscous liquid at low temperature to mimic the solidication process of urea. Second, the development of th

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31

Pinto, Francisco de Moura. "Especificação de funções de transferência unidimensionais e multidimensionais para visualização volumétrica direta." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/12077.

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Анотація:

O uso de dados volumétricos é bastante comum em diversas áreas da ciência, como Medicina, Física e Meteorologia. São exemplos típicos os dados provenientes de dispositivos de tomografia computadorizada ou ressonância magnética e os obtidos através de estimação de fenômenos físicos pelo uso de sensores diversos ou de simulação numérica. Tais dados apresentam-se, freqüentemente, sob a forma de uma grade tridimensional regular, onde cada elemento possui um valor escalar ou multidimensional (uma tupla de valores). Outras topologias também podem ser usadas para exprimir a disposição espacial dos va

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32

Prauchner, João Luis. "Especificação de funções de transferência para visualização volumétrica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/164626.

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Анотація:

Técnicas de visualização volumétrica direta são utilizadas para visualizar e explorar volumes de dados complexos. Dados volumétricos provêm de diversas fontes, tais como dispositivos de diagnóstico médico, radares de sensoriamento remoto ou ainda simulações científicas assistidas por computador. Um problema fundamental na visualização volumétrica é a especificação de Funções de Transferência (FTs) que atribuem cor e opacidade aos valores escalares que compõem o volume de dados. Essas funções são importantes para a exibição de características e objetos de interesse do volume, porém sua definiçã

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33

Mahdi, Hashim Salman. "Analysis of unsteady heat transfer by natural convection in a two-dimensional square cavity using a high order finite-volume method." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184719.

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Unsteady heat transfer by natural convection in a closed square cavity is investigated numerically. A new finite-volume approach is developed and applied to the two-dimensional continuity, vorticity, and energy equations. The variation of the field variables is approximated by bi-quadratic interpolation formulas over the space occupied by the finite volume and the region surrounding it. These are used in the integral conservation laws for energy, vorticity and mass. The convective transport is modelled using a new upstream-weighting approach which uses volume averages for the vorticity and the

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34

Palanisamy, Povendhan. "Methodology Development for Topology Optimization of Power Transfer Unit Housing Structures." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281816.

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Simulation driven design is a method and process that has been developed over many years, and with today’s advanced software, the possibility to embed simulation into the design process has become a reality. The advantages of using simulation driven design in the product development process is well known and compared to a more traditional design process, the simulation driven design process can give the user the possibility to explore, optimize and design products with reduced lead time. One of the methods that is applied in simulation driven design is the use of topology optimization (struct

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35

Pit, Vincent. "Codage du flot géodésique sur les surfaces hyperboliques de volume fini." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00553138.

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Cette thèse traite de l'étude des objets reliés au codage de Bowen-Series du flot géodésique pour des surfaces hyperboliques de volume fini. On démontre d'abord que le billard géodésique associé à domaine fondamental "even corners" d'un groupe fuchsien cofini est conjugué à une bijection du tore, appelée codage étendu, dont l'un des facteurs est la transformation de Bowen-Series. L'intérêt principal de cette conjugaison est qu'elle ne fait toujours intervenir qu'un nombre fini d'objets. On retrouve ensuite des résultats classiques sur le codage de Bowen-Series : il est orbite-équivalent au gro

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36

Liu, Yao. "Heat transfer process between polymer and cavity wall during injection molding." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-157361.

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Injection molding is one of the most commonly applied processing methods for plastic components. Heat transfer coefficient (HTC), which describes the heat conducting ability of the interface between a polymer and cavity wall, significantly influences the temperature distribution of a polymer and mold during injection molding and thus affects the process and quality of plastic products. This thesis focuses on HTC under diverse processing situations. On the basis of the heat conducting principle, a theoretical model for calculating HTC was presented. Injection mold specially used for measuring a

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37

Khalid, Muhammad. "Influence of solvent viscosity, polarity and polarizability on the chemiluminescence parameters of inter and intramolecular electron transfer initiated chemiexcitation systems." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-29092015-114251/.

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The cyclic peroxides: diphenoyl peroxide (1), spiro-adamantyl-1,2-dioxetanone (2) and 4-(3-tert-butyldimethylsilyloxyphenyl)-4-methoxyspiro[1.2-dioxetane-3.2\'-adamantane] (3) synthesized, purified and characterized, also their kinetic and chemiluminescence (CL) properties were determined. The influence of solvent polarity on the chemiexcitation parameters of the catalyzed decomposition of 1 and 2, as well as the induced decomposition of 3 were examined in several binary solvent mixtures with different polarity and polarizability parameters, but similar viscosities. For solvents with low polar

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NASCIMENTO, Genildo Ribeiro do. "Escoamento multifásico não-isotérmico em riser flexível: modelagem e simulação." Universidade Federal de Campina Grande, 2011. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/2122.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-11-05T12:39:57Z No. of bitstreams: 1 GENILDO RIBEIRO DO NASCIMENTO - TESE (PPGEP) 2011.pdf: 15030089 bytes, checksum: e81e7db2dc5710f5ef448ea2e4b1e612 (MD5)<br>Made available in DSpace on 2018-11-05T12:39:57Z (GMT). No. of bitstreams: 1 GENILDO RIBEIRO DO NASCIMENTO - TESE (PPGEP) 2011.pdf: 15030089 bytes, checksum: e81e7db2dc5710f5ef448ea2e4b1e612 (MD5) Previous issue date: 2011-08-24<br>Este trabalho apresenta um estudo teórico sobre escoamento multifásico (gás-óleo pesado-água) em dutos flexíveis que tem uso em diversas aplica

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39

Pathak, Mihir Gaurang. "Thermal dispersion and convective heat transfer during laminar pulsating flow in porous media." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34738.

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Solid-fluid thermal interactions during unsteady flow in porous media play an important role in the regenerators of pulse tube cryocoolers. Pore-level thermal processes in porous media under unsteady flow conditions are poorly understood. The objective of this investigation is to study the pore-level thermal phenomena during pulsating flow through a generic, two-dimensional porous medium by numerical analysis. Furthermore, an examination of the effects of flow pulsations on the thermal dispersion and heat transfer coefficient that are encountered in the standard, volume-average energy equation

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40

Beltrán, Lizeth Andrea Castellanos. "Volumetric visualization of confocal datasets obtained from bile duct samples." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/115302.

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A exploração visual dos dutos biliares é de relevante interesse clínico, pois fornece informação relacionada com a Atresia Biliar (AB). A AB é uma doença cujas causas ainda permanecem desconhecidas e que eventualmente leva a um transplante de fígado ou, nos casos mais avançados da doença, leva a óbito do paciente. A única evidência física conhecida até agora da existencia de AB é a obstrução das vias biliares. No entanto, o estudo desta doença tem sido limitado pela incapacidade de analisar o duto biliar de pacientes em estágios precoces da doença e muito pouco se sabe sobre a estrutura intern

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41

Mehmood, Nasir. "Effets de l'hydrodynamique et du transfert d'oxygène sur la physiologie de Streptomyces pristinaespiralis lors de cultures en flacons agités." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL016N/document.

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Dans le cadre de ce travail de thèse, la physiologie apparente de Streptomyces pristinaespiralis et plus spécifiquement la production de pristinamycines (déclenchement et concentration) a été reliée à son environnement hydrodynamique. Des cultures de S. pristinaespiralis ont été réalisées sous diverses conditions d'agitation et d'aération, en fioles lisses d’Erlenmeyer. Ces conditions engendrent des dissipations volumiques comprises entre 0,55 et 14 kW.m-3 et des kLa compris entre 30 et 490 h-1. Partant du constat de la complexité combinée de l’hydrodynamique rencontrée dans les bioréacteurs e

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42

Liu, Yao. "Heat transfer process between polymer and cavity wall during injection molding." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20165.

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Injection molding is one of the most commonly applied processing methods for plastic components. Heat transfer coefficient (HTC), which describes the heat conducting ability of the interface between a polymer and cavity wall, significantly influences the temperature distribution of a polymer and mold during injection molding and thus affects the process and quality of plastic products. This thesis focuses on HTC under diverse processing situations. On the basis of the heat conducting principle, a theoretical model for calculating HTC was presented. Injection mold specially used for measuring

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García-Moreno, Aracelys. "Construction of injectable wireless microstimulators based on rectification of volume conducted high frequency currents." Doctoral thesis, Universitat Pompeu Fabra, 2022. http://hdl.handle.net/10803/673986.

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Functional neuromuscular stimulation (FNS) refers to the delivery of electrical stimuli to nerves or muscles to enhance, modify or restore motor functions. Despite their invasiveness, implantable systems for FNS offer key advantages over surface and percutaneous systems in terms of selectivity and safety. Most implantable FNS systems consist of a relatively bulky subcutaneous pulse genera-tor connected through leads to electrodes at the target stimulation sites. In the case of FNS systems for restoring motor functions in patients with paralysis, the leads are long and the electrodes are

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Maaroufi, Maroua. "Modélisation des transferts hygrothermiques dans les matériaux de construction : incidence de l’hystérésis." Thesis, La Rochelle, 2019. http://www.theses.fr/2019LAROS028.

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Le présent travail vise à étudier l’influence de la microstructure des éco-matériaux de construction alternatifs utilisés dans les parois des bâtiments, tels que le béton de polystyrène sur les transferts de chaleur et d’humidité. L’objectif de ces travaux de thèse est de prédire le comportement hygrothermique des bâtiments dans une optique d’amélioration de la durabilité et des performances énergétiques. Afin d’y parvenir, ceci nécessite une approche multi-échelle qui consiste d’abord à décrire minutieusement la microstructure des matériaux étudiés, puis à maîtriser les interactions entre les

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45

Kleynhans, Bertus George. "Effective material usage in a compact heat exchanger with periodic micro-channels / Bertus George Kleynhans." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8707.

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All modern High Temperature Reactors (HTR) thermal cycles have one thing in common: the use of some form of heat exchanger. This heat exchanger is used to pre-heat or cool the primary loop gas, from where the secondary power generation cycle is driven. The Compact Heat Exchanger (CHE) type offers high heat loads in smaller volumes. Various studies have been done to improve the heat transfer in the flow channels of these CHEs but little focus has been placed on the thermal design of surrounding material in such a heat exchanger. The focus of this study is on the effective material usage in a CH

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46

Trovalet, Lionel. "Résolution numérique des transferts par rayonnement et conduction au sein d'un milieu semi-transparent pour une géométrie 3D de forme complexe." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10142/document.

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Ce travail porte sur la résolution numérique des transferts couplés par rayonnement et conduction au sein d'un milieu semi-transparent pour une géométrie 3D de forme complexe. Le rayonnement thermique est simulé par un code de calcul développé durant cette thèse. Ce code résout l'équation du transfert radiatif (ETR) par une méthode aux volumes finis (MVF) avec une formulation " cell-vertex " s'appliquant à des maillages tétraédriques non structurés. Il utilise un schéma de fermeture de type exponentiel, un ordre de parcours ainsi qu'une résolution matricielle innovante pour la MVF appliquée à

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47

Pokorný, Emil. "Návrh konstrukce překládacího vozu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442813.

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The aim of the diploma thesis is the structural design of the field transfer trailer designed for harvesting work in agriculture. The first part of the thesis contains an overview of similar construction solutions and a summary of legislative requirements related to the device. In the next part is performed a description of the individual structural units, the design of the drive and the design of the screw conveyors. Based on the stated load conditions, the strength analysis of the large – volume hopper is processed, which is evaluated in the final part. An integral part of the thesis is also

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48

Bayeux, Charlotte. "Méthode intégrale pour la couche limite tridimensionnelle - Applications au givrage." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0047/document.

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Depuis de nombreuses années, le givrage a été identifié comme un danger dans le domaine de l’aéronautique.L’accrétion de givre se produit lorsque des gouttelettes d’eau surfondue se déposent sur une surface, enparticulier le bord d’attaque d’une aile ou la lèvre d’entrée d’air moteur, et gèlent après l’impact. Ceci peutensuite engendrer une dégradation des performances aérodynamiques, un dysfonctionnement des sondes ouencore un endommagement du moteur. C’est pourquoi cette problématique est étudiée avec attention. Lesessais en vol et en soufflerie étant longs et coûteux, la simulation numériqu

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Hernandez, Maldonado Daniel. "Photovoltaïque organique : étude de la morphologie de films minces, conception, synthèse et étude de petites molécules pour leur utilisation en hétérojonction en volume dans des dispositifs photovoltaïques." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30103/document.

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Les propriétés des matériaux organiques pour l'optoélectronique à base de polymères ou de petites molécules sont fortement influencées par l'organisation moléculaire. En particulier, l'efficacité de la photoconversion dans les dispositifs à base de films minces organiques peut être corrélée directement à la morphologie de leurs mélanges actifs. Par conséquent, une meilleure compréhension de l'évolution de la morphologie des films minces pendant les divers traitements effectués lors de leur élaboration est essentielle et nécessaire. D'autre part, l'ingénierie moléculaire est un outil crucial po

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50

Msayib, Yunus. "Quantifying impaired metabolism following acute ischaemic stroke using chemical exchange saturation transfer magnetic resonance imaging." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:a98323ce-5998-436d-bca4-09df549cf191.

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In ischaemic stroke a disruption of cerebral blood flow leads to impaired metabolism and the formation of an ischaemic penumbra in which tissue at risk of infarction is sought for clinical intervention. In stroke trials, therapeutic intervention has largely been based on perfusion-weighted measures, but these have not been shown to be good predictors of tissue outcome. The aim of this thesis was to develop analysis techniques for magnetic resonance imaging (MRI) of chemical exchange saturation transfer (CEST) in order to quantify metabolic signals associated with tissue fate in patients with a

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