Дисертації з теми "Conductive Elements"
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Gilvary, B. "Element by Element methods for heat conduction problems." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378333.
Повний текст джерелаLediaev, Laura Marie. "Finite element modeling of piezoelectric bimorphs with conductive polymer electrodes." Thesis, Montana State University, 2010. http://etd.lib.montana.edu/etd/2010/lediaev/LediaevL0510.pdf.
Повний текст джерелаYin, John Zhihao. "Finite element model of cardiac electrical conduction." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/26859.
Повний текст джерелаHamina, M. (Martti). "Some boundary element methods for heat conduction problems." Doctoral thesis, University of Oulu, 2000. http://urn.fi/urn:isbn:951425614X.
Повний текст джерелаBaranowski, Robert Paul. "Numerical modelling of current transfer in nonlinear anisotropic conductive media." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/104785.
Повний текст джерелаFischer, Kristin Mckeon. "Creation and Characterization of Several Polymer/Conductive Element Composite Scaffolds for Skeletal Muscle Tissue Engineering." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77305.
Повний текст джерелаPh. D.
Gaugele, Timo [Verfasser]. "Application of the Discrete Element Method to Model Ductile, Heat Conductive Materials / Timo Gaugele." Aachen : Shaker, 2011. http://d-nb.info/1075437350/34.
Повний текст джерелаZhang, Lei Ph D. Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science. "A boundary element method with surface conductive absorbers for 3-D analysis of nanophotonics." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62462.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 127-132).
Fast surface integral equation (SIE) solvers seem to be ideal approaches for simulating 3-D nanophotonic devices, as these devices generate fields both in an interior channel and in the infinite exterior domain. However, many devices of interest, such as optical couplers, have channels that cannot be terminated without generating reflections. Generating absorbers for these channels is a new problem for SIE methods, as the methods were initially developed for problems with finite surfaces. In this thesis, we show that the obvious approach for eliminating reflections, making the channel mildly conductive outside the domain of interest, is inaccurate. We propose a new method in which the absorber has gradually increasing surface conductivity; such an absorber can be easily incorporated in fast integral equation solvers. We present two types of PMCHW-based formulations to incorporate the surface conductivity into the SIE method. The accuracy of the two-type formulations are examined and discussed using an example of the scattering of a Mie sphere with surface conductivities. Moreover, we implement two different FFT-accelerated algorithms for the periodic non-absorbing region and the non-periodic absorbing region. In addition, we use perturbation theory and Poynting's theorem, respectively, to calculate the field decay rate due to the surface conductivity. We show a saturation phenomenon when the electrical surface conductivity is large. However, we show that the saturation is not a problem for the surface absorber since the absorber typically operates in a small surface conductivity regime. We demonstrate the effectiveness of the surface conductive absorber by truncating a rectangular waveguide channel. Numerical results show that this new method is orders of magnitude more effective than a volume absorber. We also show that the transition reflection decreases in a power law with increasing the absorber length. We further apply the surface conductive absorber to terminate a waveguide with period-a sinusoidally corrugated sidewalls. We show that a surface absorber that can perform well when the periodic waveguide system is excited with a large group-velocity mode may fail when excited with a smaller group-velocity mode, and give an asymptotic relation between the surface absorber length, transition reflections and group velocity. Numerical results are given to validate the asymptotic prediction.
by Lei Zhang.
Ph.D.
Guven, Ibrahim. "A coupled finite element-boundary element method for two dimensional transient heat conduction and thermoelastic analyses." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/289183.
Повний текст джерелаBarnes, Johanna S. "Teachers' continuation of action research elements after conducting studies during a Master's program." Thesis, University of South Dakota, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3589862.
Повний текст джерелаTeachers are critical to student learning in the classroom, and just like students, teachers perform better when they are able to make choices based on what is relevant to them. Action research is a way for teachers to systematically inquire and reflect to make necessary improvements in practice for student learning. This study involved teachers who had conducted action research as a component of their Master's in Curriculum and Instruction program at one Midwest college. It examined teachers' perceived lasting benefits of conducting action research, the elements they continue to implement, and the supports of and limitations to continuation of the practice.
As part of a mixed-method study, a researcher-developed survey was first used. Seventy-seven teachers provided responses to the online survey. Fifteen survey participants volunteered to offer narrative elaboration of their responses in a follow-up telephone interview.
The compiled data included totals and percentages from the survey and themes and quotations from the teachers' narrative responses. Together, the findings revealed that 98% of the teachers felt they benefited from conducting action research. They perceived the greatest professional benefits of conducting action research to be thinking more reflectively, positively impacting student learning, and inquiring more about their practice.
Teachers were continuing to conduct action research based on the impact they perceived the practice had on their students' success in the classroom. The elements they continued most often were identifying a focus, collecting and analyzing data, and reflecting on the process. This practice allowed them to learn from evaluating the effectiveness of their implementations and realize there was rigor and relevance to what they were doing.
With 92% of participants desiring to continue action research, two major factors were given as greatest support for continuation. Teachers desired a combination of collaboration with peers on issues that mattered to them and time in the school day to collaborate and conduct action research.
Samonds, M. T. "Finite element simulation of solidification in sand mould and gravity die castings." Thesis, Swansea University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384446.
Повний текст джерелаWassef, Karim N. "Nonlinear transient finite element analysis of conductive and ferromagnetic regions using a surface admittance boundary condition." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13318.
Повний текст джерелаAyasoufi, Anahita. "Numerical Simulation of Heat Conduction with Melting and/or Freezing by Space-Time Conservation Element and Solution Element Method." See Full Text at OhioLINK ETD Center (Requires Adobe Acrobat Reader for viewing), 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1103147485.
Повний текст джерелаTypescript. "A dissertation [submitted] as partial fulfillment of the requirements of the Doctor of Philosophy degree in Engineering." Bibliography: leaves 194-211.
Kell, James. "Melt pool and microstructure manipulation using diffractive holographic elements in high power conduction laser welding." Thesis, Loughborough University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479315.
Повний текст джерелаErhart, Kevin. "EFFICIENT LARGE SCALE TRANSIENT HEAT CONDUCTION ANALYSIS USING A PARALLELIZED BOUNDARY ELEMENT METHOD." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2973.
Повний текст джерелаM.S.M.E.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Mechanical Engineering
Rickelt, Stefan [Verfasser]. "Discrete Element Simulation and Experimental Validation of Conductive and Convective Heat Transfer in Moving Granular Material / Stefan Rickelt." Aachen : Shaker, 2011. http://d-nb.info/1071528858/34.
Повний текст джерелаSoto, Nathan Daniel. "Characterizing Nerve Fiber Activation By Varying Fiber Diameter And Depth Within a Conductive Medium: A Finite Element Approach." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/608.
Повний текст джерелаRosenband, Linda Maj. "The study of aberrant conduction in myocardial tissue using a finite-element computer simulation." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/72312.
Повний текст джерелаFigueiredo, Patric. "Iterative method for solving inverse heat conduction problems." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14400.
Повний текст джерелаSafi, Iyad. "A study of reactive magnetron sputtering of alloy transparent conducting oxides from elemental targets." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/14118.
Повний текст джерелаErhart, Kevin. "A Laplace Transform Boundary Element Method Approach to the Solution of Large-Scale Transient Heat Conduction Problems." Honors in the Major Thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/705.
Повний текст джерелаBachelors
Engineering and Computer Science
Mechanical Engineering
Lesnic, Daniel. "Boundary element methods for solving steady potential flow problems and direct and inverse unsteady heat conduction problems." Thesis, University of Leeds, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404773.
Повний текст джерелаDang, Kai. "Modèles de conduction électrique pour la stimulation de l'implant cochléaire." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4043/document.
Повний текст джерелаComputational models have been widely used to improve the knowledge of the current distribution behavior in cochlear implant stimulations, optimizing electrode designs and stimulation strategies. The existing models employed no or simple electrochemical interface models and took current intensity on the electrodes as input. Therefore they have difficulties in making time domain simulations and simulating the stimulation modes that have voltage constraints, such as the Common Ground and the Multi-Mode Grounding modes. In this PhD work, a new parametric surface mesh model of the cochlea has been developed. The shape of the model is controlled by a set of input parameters which can be tuned to fit the cochlear shape acquired from histological images, CT scans or existing cochlear mesh models. The symmetric boundary element method, which was implemented in OpenMEEG, has been applied on the model to simulate the current distribution of the cochlear implant stimulation. Using the parametric model, comparisons on the current field has been made between the existing electrode layouts and a new transmodiolar electrodes. The new model can take either current or voltage as input for each electrode to simulate the common ground and multi-mode grounding modes. By coupling the surface model with lumped capacitor and constant phase element models, time domain simulation of the stimulation waveform has also been achieved. To validate the simulation results and calibrate the parameters of the model, in-situ and in-vitro measurements have been carried out with self-made devices. The recorded data proved the effectiveness of combining lumped components with the surface model
Maréchal, Yves. "Modélisation des phénomènes magnétostatiques avec terme de transport : application aux ralentisseurs électromagnétiques." Grenoble INPG, 1991. http://www.theses.fr/1991INPG0021.
Повний текст джерелаWood, Sandra Jean. "Determination of effective thermal conductivity of media surrounding underground transmission cables." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/17390.
Повний текст джерелаGhattassi, Mohamed. "Modélisation, observation et commande d’une classe d’équations aux dérivées partielles : application aux matériaux semi-transparents." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0123/document.
Повний текст джерелаThis thesis investigates the theoretical and numerical analysis of coupled radiative conductive heat transfer in a semi-transparent, gray and non-scattering 2D medium. This two heat transfer modes are described by the radiative transfer equation (RTE) and the nonlinear heat equation (NHE). We proved the existence and uniqueness of the solution of coupled systems with homogeneous Dirichlet boundary conditions using the fixed-point theorem. Moreover, we developed a useful algorithm to simulate the temperature in the medium. We used the quadrature $S_{N}$ for the angular discretization of the RTE. The spatial discretization of RTE was made by the discontinuous Galerkin method (DG) and the finite element method for the non-linear heat equation. We have shown the convergence and the stability of the coupled numerical scheme using the discrete fixed point. The discrète model obtained after an approximation allowed us to do the analysis and synthesis of state estimators and feedback control design for stabilization of the system. Thanks to the special structure of the model and using the Differential Mean Value Theorem (DMVT), we proposed a reduced order observer and we construct a gain matrix, which ensures the exponential stability of the proposed observer and guarantees the boundedness of the estimate vector. An extension to $\mathcal{H}_{\infty}$ filtering is also provided. We have extended the reduced order approach in the case of the observer-based controller and we proved the exponential stability under the control feedback law. Similarly, an extension to $\mathcal{H}_{\infty}$ filtering is also provided. The obtained results were validated through several numerical simulations
Liang, Yan. "Integrated Frequency-Selective Conduction Transmission-Line EMI Filter." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26360.
Повний текст джерелаPh. D.
Ramos, Gustavo Roberto. "Método multiescala para modelagem da condução de calor transiente com geração de calor : teoria e aplicação." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/133134.
Повний текст джерелаThis work deals with the modeling of transient heat conduction with heat generation in heterogeneous media, and its objective is to develop a proper multiscale model for this phenomenon. There already exist multiscale models in the literature related to this proposed problem, and which are valid for the following cases: (a) the representative volume element has a negligible size when compared to the characteristic macroscopic size (and, as a consequence, the microscale has a negligible thermal inertia); or (b) the heat generation is homogeneous at the microscale. On the other hand, the model proposed in this thesis, which is developed using a variational description of the problem, can be applied to finite representative volume elements and in conditions in which the heat generation is heterogeneous at the microscale. The time discretization (finite difference) and the space discretizations at both the microscale and the macroscale (finite element method) are presented in details, together with the algorithms needed for implementing the solution of the problem. In this thesis, simple numerical cases are presented, aiming to verify not only the theoretical multiscale model developed, but also its implementation. For this, it is analyzed, for instance, (a) cases in which the microscale is taken as a homogeneous material, making it possible the comparison of the multiscale solution with the conventional solution (one single scale) by the finite element method, and (b) a case in a heterogeneous material for which the full solution, that is, modeling all constituents directly on the macroscale, is obtained, making it possible the comparison with the multiscale solution. The solution at the microscale for several cases analyzed in this thesis suffers a large influence of the microscale thermal inertia. To demonstrate the application potential of the multiscale model, the cure of a carbon black loaded elastomer is simulated. Although the simulation shows that the thermal inertia does not have to be considered for this case in particular, the application of the present methodology makes it possible to model the cure of the elastomer directly at the microscale, an approach not used in multiscale methods context until now. This methodology opens the possibility for future improvements of the state of cure modeling.
Al-Jawary, Majeed Ahmed Weli. "The radial integration boundary integral and integro-differential equation methods for numerical solution of problems with variable coefficients." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6449.
Повний текст джерела片峯, 英次, Eiji Katamine, 秀幸 畔上, Hideyuki Azegami, 雅美 小嶋 та Masami Kojima. "定常熱伝導場における境界形状決定". 日本機械学会, 1999. http://hdl.handle.net/2237/7265.
Повний текст джерелаVieira, Alan Lima [UNESP]. "Aperfeiçoamento e avaliação de um novo sistema de digestão assistida por aquecimento condutivo em frasco fechado para preparar amostras de carne “in natura” para análise elementar." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/136387.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Estabelecer procedimentos simples, rápidos, eficientes e com preparo de amostras de baixo custo para determinar elementos em amostras de carne é um aspecto relevante para fins nutricionais e de saúde. Por esta razão, um sistema de digestão com aquecimento condutivo em frasco fechado (CHDS), foi avaliado recentemente para a decomposição de amostras “in natura” de músculo, fígado e rim (bovino, suíno e frango) visando a determinação de macronutrientes (Ca, Mg, Na, K, S e P), micronutrientes (Cu, Fe, Mn, Mo, Se e Zn) e contaminantes inorgânicos (As, Cd, Cr e Pb) por espectrometria de emissão óptica com plasma acoplado indutivamente (ICP OES) e espectrometria de massas com plasma acoplado indutivamente (ICP-MS). O aperfeiçoamento feito no CHDS foi planejado para melhorar a segurança, a praticidade e a robustez do sistema. Entre elas destaca-se a adaptação de um pistão a gás na tampa do gabinete de digestão; isolamento dos frascos no interior do gabinete de digestão; tampa de Teflon com sistema simples de alívio de pressão ao fim da decomposição sem manuseio do frasco. A precisão foi avaliada analisando três materiais de referência certificados digeridos pelo CHDS. As recuperações para Ca, Cu, Fe, Mg, Mn, Na, K, S, P e Zn determinados por ICP OES, variaram entre 85 a 106%. Para As, Cd, Cr, Mo, Pb e Se determinados por ICP-MS, foram obtidas recuperações entre 92 a 110%. A eficiência da digestão também foi avaliada pela determinação do teor de carbono residual, que variou de 10 a 12% m m-1. Quando as amostras de carne foram digeridas usando o CHDS, os resultados para Ca, Cu, Fe, Mg, Mn, Na, K, S, P e Zn determinados por ICP OES e para As, Cd, Cr, Mo, Pb e Se determinados por ICP-MS foram concordantes com aqueles obtidos após digestão ácida assistida por radiação micro-ondas em frasco fechado (MW-AD). Ao utilizar o CHDS, os limites de quantificação foram similares aos obtidos com a MW-AD para todos os analitos. O CHDS é capaz de digerir 800 mg de amostra de carne “in natura” utilizando 2 mL de HNO3 e 1 mL H2O2. O procedimento proposto foi capaz de atender a Instrução Normativa da Secretária de Defesa Agropecuária (SDA) nº 13 que trata do monitoramento de resíduos e contaminantes em carnes para As, Cd e Pb. Os resultados obtidos neste estudo estendem as aplicações do CHDS para amostras com maior teor de gordura, tais como músculo, fígado e rim. Este sistema de digestão simples e de baixo custo pode ser utilizado para preparar amostras para determinação subsequente de um grande número de elementos por espectrometria de ICP, incluindo espécies voláteis, tais como, As, Cd e Se.
Establishing simple, fast, efficient and low-cost sample preparation procedures to determine elements in meat samples is a relevant aspect for nutritional and health purposes. For this reason, the recently proposed closed-vessel conductivelyheated digestion system (CHDS) was evaluated for the decomposition of muscle, liver and kidney (cattle, pigs and chickens) samples fresh aiming for the determination of macronutrients (Ca, Mg, Na, K, S and P), micronutrients (Cu, Fe, Mn, Mo, Se and Zn) and inorganic contaminants (As, Cd, Cr and Pb) by inductively coupled plasma optical emission spectrometry (ICP OES) and inductively coupled plasma mass spectrometry (ICP-MS). The optimization of the CHDS was planned to improve safety, practicality and robustness such as adaptation of a gas piston in the digestion cabinet cover, isolation of vessels inside the digestion cabinet and a Teflon cap with a simple pressure relief system in the end of the decomposition without handling the vessel. The accuracy was evaluated by analyzing three certified reference materials digested by the CHDS. Recoveries for Ca, Cu, Fe, Mg, Mn, Na, K, S, P and Zn determinations by ICP OES varied from 85 to 106%. For As, Cd, Cr, Mo, Pb and Se determinations by ICP-MS, recoveries within the 92-110% were obtained. The digestion efficiency was also evaluated by determining the residual carbon content, which varied from 10 to 12% m m-1. When fresh meat samples were digested using the CHDS, results for Ca, Cu, Fe, Mg, Mn, Na, K, S, P and Zn determinations by ICP OES and for As, Cd, Cr, Mo, Pb and Se determinations by ICP-MS were in agreement with those obtained after closed-vessel microwave-acid digestion (MW-AD). When using the CHDS, limits of quantification were similar to those obtained with the MW-AD for all analytes. The CHDS enabled the digestion of 800 mg of fresh meat with 2 mL of HNO3 and 1 ml of H2O2. The proposed procedure was able to attend the normative instruction of agricultural defense secretary SDA N°. 13 for As, Cd and Pb. The results obtained in this study extend the applications of the CHDS to samples with higher contents of fat such as muscle, liver and kidney. This simple and low-cost digestion system can be used to prepare samples for subsequent determination of a large number of elements by ICP spectrometry, including volatile species such as As, Cd and Se.
片峯, 英次, Eiji Katamine, 秀幸 畔上, Hideyuki Azegami, 易広 松浦 та Yasuhiro Matsuura. "非定常熱伝導場における形状同定問題の解法". 日本機械学会, 2000. http://hdl.handle.net/2237/7266.
Повний текст джерелаPadilla, Scott T. "Novel Transducer Calibration and Simulation Verification of Polydimethylsiloxane (PDMS) Channels on Acoustic Microfluidic Devices." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6922.
Повний текст джерелаAZEGAMI, Hideyuki, Yutaro IWATA, Eiji KATAMINE, 秀幸 畔上, 侑太朗 岩田 та 英次 片峯. "放熱量最大化を目的とした非定常熱伝導場の形状最適化". 一般社団法人日本機械学会, 2008. http://hdl.handle.net/2237/21114.
Повний текст джерелаChaouch, Mounir. "Effet de l'intensité du traitement sur la composition élémentaire et la durabilité du bois traité thermiquement : développement d'un marqueur de prédiction de la résistance aux champignons basidiomycètes." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10027/document.
Повний текст джерелаThermal treatment has been used to improve properties of non durable European species. Chemical modification of some of the wood components provides improved dimensional stability and biological performance against decay fungi while mechanical properties such as modulus of rupture are reduced. Quality control of commercially made thermally treated wood is one of the major road blocks of its industrial development. The variability inherent within a wood species and between wood species, density and chemical compositions variation combined with the heat treatment parameters such as temperature duration and levels contribute to the production of heterogeneous heat treated wood. The development of a heat treatment process by conduction which monitors the weight changes during the process will facilitate and help in controlling, in understanding and predicting the properties of heat treated wood. Data collected from a pilot study of heat treated wood using conditions similar to commercial process show that hardwood species were more susceptible to thermal degradation as compared to softwood. It was also established that wood chemical composition is directly connected to the percent of weight loss due to thermodegradation, allowing the use of chemical composition to predict fungi durability. Carbon and oxygen contents and/or oxygen to carbon ratio of heat treated wood can be therefore used as valuable markers to develop quality control assessment of heat treated wood
Pietromonaco, Joseph Allen. "A Heat Transfer Model for Industrial Food Processes." Youngstown State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1312936641.
Повний текст джерелаHusain, Muhammad Dawood. "Development of temperature sensing fabric." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/development-of-temperature-sensing-fabric(0e5e8367-c3b2-4cff-bcc9-f32fac97b50f).html.
Повний текст джерелаHaňka, Jiří. "Měření a modelování skutečných impedančních výsledků v závislosti na poloze snímacích elektrod." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221079.
Повний текст джерелаDomeij, Bäckryd Rebecka. "Simulation of Heat Transfer on a Gas Sensor Component." Thesis, Linköping University, Department of Mathematics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131.
Повний текст джерелаGas sensors are today used in many different application areas, and one growing future market is battery operated sensors. As many gas sensor components are heated, one major limit of the operation time is caused by the power dissipated as heat. AppliedSensor is a company that develops and produces gas sensor components, modules and solutions, among which battery operated gas sensors are one targeted market.
The aim of the diploma work has been to simulate the heat transfer on a hydrogen gas sensor component and its closest surroundings consisting of a carrier mounted on a printed circuit board. The component is heated in order to improve the performance of the gas sensing element.
Power dissipation occurs by all three modes of heat transfer; conduction from the component through bond wires and carrier to the printed circuit board as well as convection and radiation from all the surfaces. It is of interest to AppliedSensor to understand which factors influence the heat transfer. This knowledge will be used to improve different aspects of the gas sensor, such as the power consumption.
Modeling and simulation have been performed in FEMLAB, a tool for solving partial differential equations by the finite element method. The sensor system has been defined by the geometry and the material properties of the objects. The system of partial differential equations, consisting of the heat equation describing conduction and boundary conditions specifying convection and radiation, was solved and the solution was validated against experimental data.
The convection increases with the increase of hydrogen concentration. A great effort was made to finding a model for the convection. Two different approaches were taken, the first based on known theory from the area and the second on experimental data. When the first method was compared to experiments, it turned out that the theory was insufficient to describe this small system involving hydrogen, which was an unexpected but interesting result. The second method matched the experiments well. For the continuation of the project at the company, a better model of the convection would be a great improvement.
Fritsch, Julia. "Synthese und Charakterisierung molekularer Vorläuferverbindungen für den Einsatz in weichen lithographischen Verfahren sowie katalytisch aktiver elementorganischer Gerüstverbindungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-96328.
Повний текст джерелаArgento, Claudio. "Modélisation du comportement thermique et mécanique des poudres métalliques : application à la compaction isostatique à chaud." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10084.
Повний текст джерелаVaverka, Jiří. "Výpočtové modelování srdeční kontrakce." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241725.
Повний текст джерелаRahmanian, Ima. "Thermal and mechanical properties of gypsum boards and their influences on fire resistance of gypsum board based systems." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/thermal-and-mechanical-properties-of-gypsum-boards-and-their-influences-on-fire-resistance-of-gypsum-board-based-systems(d8eb4bf5-706a-4264-911f-9584ebfbbc83).html.
Повний текст джерелаJaiswal, Vinay Kumar. "Finite element modeling of electric field distributions around a resistive glazed post station insulator covered with ice = Modélisation par éléments finis de la distribution du champ électrique autour d'un isolateur de poste avec une couche semi-conductrice recouvert de glace /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2005. http://theses.uqac.ca.
Повний текст джерелаLindqvist, Petter. "Validering av solida temperaturer i FDS genom jämförelse mot FE-beräkningar." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79973.
Повний текст джерелаFDS (Fire Dynamics Simulator) uses a version of the Navier-Stokes equations to make accurate calculations of heat and gas flow through enclosures exposed to fire. The developers of FDS have, and continue to, validate it as new features get added in an attempt to increase its accuracy and broaden its potential applications. However, little of this effort is focused on FDS’ conductive heat transfer model, based on the one-dimensional Crank-Nicolson method. Thus, this study aims to test the accuracy of FDS’ conduction model by comparing it to calculations using FEM (Finite Element Method). FDS simulations were created so as to facilitate the study of a wall and its boundary conditions with as little interference from other factors as possible. This to create a controlled environment which easily could be replicated in the subsequent FE-calculations of the conductive heat flow through the solid obstructions. Three different walls (10 cm concrete, 20 cm concrete and 1 mm steel), each with the three different boundary conditions for the rear surface (Exposed, Void and Insulated), were exposed to three different temperatures (100 °C, 500 °C and 1000 °C) for a total of 27 FDS simulations. The adiabatic surface temperature was measured in each simulation in FDS and used as input for the corresponding FE-calculations. The results showed no clear inconsistencies in the boundary conditions, given enough time for thermal penetration they affected the resulting temperatures as expected. Save a slight deviation in the steel walls exposed to 100 °C and 500 °C with boundary conditions Exposed and Void where FDS slightly underestimated the temperature relative to the FE-calculations. The gas temperatures in the grid cells closest to the wall were found to be unreliable as they tended to undergo substantial fluctuations, likely as a result of how FDS handles the discretization of non-solid space for the Navier-Stokes calculations. These fluctuations were however not found to affect the solid temperatures as the mean gas temperature was accurate. FDS was also found to have a tendency to slightly overestimate the surface temperature in the first few minutes of the simulations relative to the FE-calculations. Though the resulting temperatures from the two methods converged after a few minutes at most in all tests. These deviations were considered to have too minor an impact on the solid temperature to justify claims of inaccuracy in FDS. Thus, the general conclusion of this study is that FDS’ predictions of solid phase temperatures are sufficiently accurate within these delimitations.
Dohnalík, Petr. "Návrh optimálních parametrů vícevrstvého keramického ochranného povlaku pro vysokoteplotní aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318659.
Повний текст джерелаGoy, Laurent. "Mesure et modélisation des températures dans les massifs rocheux : application au projet de tunnel profond Maurienne-Ambin." Phd thesis, Université Joseph Fourier (Grenoble), 1996. http://tel.archives-ouvertes.fr/tel-00642650.
Повний текст джерелаBen, Moussa Rim. "Contribution to thermal radiation to dust flame propagation : application to aluminium dust explosions." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2401/document.
Повний текст джерелаIn this thesis, the role of thermal radiation in aluminum-air flames propagation is studied. The subject being complex and of industrial interest, it requires the coupling of many physiochemical phenomena to accurately predict the consequences of dust explosions. A thorough literature review is proposed about the ignition and the combustion of aluminum particles and about the available theoretical models of dust flames propagation. The specific question of the nature of thermal exchanges and the influence of thermal radiation is studied. The bibliographic review underlines the simplifying assumptions and hypotheses used in the literature making possible the definition of improvement areas. Because of the limited amount of knowledge available to address these questions, a numerical tool “RADIAN” is developed enabling an accurate coupling between the different modes of heat exchange and combustion. The Discrete Element Method (DEM) is used to numerically model the radiative exchanges between particles and the gas-particle thermal conduction. The Finite Difference method is used to numerically model the thermal conduction through the gas phase and combustion. A radiative model based on Mie theory for radiation-particles interactions is incorporated. The results of the simulations are compared with available analytical solutions and experimental data. An original experimental study is also conducted to measure the distribution of irradiance ahead of the flame front and the laminar burning velocity for methane-air-Sic, methane-air-alumina and Al-air flames. A good agreement between numerical simulations and experiments is demonstrated. The Beer-Lambert’s law for radiative transfer in front of the flame front is found to be inapplicable and a new analytical solution is proposed. The presence of absorbing particles may promote the flame propagation. In particular, it is shown experimentally and confirmed theoretically/numerically that Al-air rich mixtures are likely to rapidly accelerate
Ramahaleo, Tiana. "Conductances ioniques, élasticité et perméabilité osmotique de cellules racinaires de colza (brassica napus)." Rouen, 1996. http://www.theses.fr/1996ROUES012.
Повний текст джерелаPuech, Laurence. "Critères microstructuraux pour l'identification des causes abiotiques des dépérissements du sapin (Abies alba (Mill. )) et de l'épicéa (Picea abies (L. ) Karst. ) dans les Vosges et dans les Alpes dauphinoises externes." Université Joseph Fourier (Grenoble ; 1971-2015), 1995. http://www.theses.fr/1995GRE10175.
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