Дисертації з теми "Modeling analyses"
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Næss, Kjetil Holter. "Modeling of Safety Barriers in Risk Analyses." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-21067.
Повний текст джерелаArnaud, Remi Nicolas. "Modeling analyses and data in human reliability." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/34841.
Повний текст джерелаThis method, called MERMOS, has been used for several probabilistic safety assessments. In order to increase its reproducibility and to make it more robust, example missions and scenarios will be built. This set of example analyses will be used by experts assessing human reliability: they will develop studies and deduce results more easily.
The purpose of this study involves the creation of a methodology to model existing analyses and
human reliability data used in MERMOS. This study consists of optimizing a second generation
human reliability assessment method in order to overpass its current weaknesses in an
operational context by means of the identification of a set of example analyses.
Master of Science
Xie, Nan. "Computational analyses for modeling fluidized bed gasification processes." [Ames, Iowa : Iowa State University], 2007.
Знайти повний текст джерелаOnen, Alper. "Analyses Of Flood Events Using Regional Hydrometeorological Modeling System." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615476/index.pdf.
Повний текст джерелаNnanatu, Chibuzor. "Statistical modeling and analyses of partially observed infectious diseases." Thesis, Lancaster University, 2018. http://eprints.lancs.ac.uk/127741/.
Повний текст джерелаBhowmick, Sauradeep. "Advanced Smoothed Finite Element Modeling for Fracture Mechanics Analyses." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1623240613376967.
Повний текст джерелаFriscia, Jessica M. (Jessica Marie). "Vapor intrusion modeling : limitations, improvements, and value of information analyses." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90016.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 84-89).
Vapor intrusion is the migration of volatile organic compounds (VOCs) from a subsurface source into the indoor air of an overlying building. Vapor intrusion models, including the Johnson and Ettinger (J&E) model, can be used to predict the concentration of VOCs in the indoor air of a building based on a measured subsurface soil gas concentration or contaminant source concentrations, either in non-aqueous phase liquid (NAPL), groundwater, or soil. An analysis of two of the EPA-implemented J&E spreadsheet models, one that considers subsurface soil gas data and one that considers groundwater data, was conducted. The governing equations, assumptions, and limitations of these spreadsheet models were investigated. A value of information (Vol) worksheet was developed that can assist practitioners in deciding what additional data to collect as part of a remedial investigation. The Vol worksheet calculates how varying values of model input parameters affect the model-predicted indoor air carcinogenic risk. The worksheet then compares the user-defined target risk to the range of potential risk values for different combinations of varying parameters. The results of this analysis allow the user to determine which groups of parameters have the most impact on the model results. This information can assist the practitioner in deciding whether or not to collect additional data to reduce the uncertainty in the input parameters. The EPA J&E soil gas and groundwater spreadsheet models, as well as the Vol worksheet developed for each model, were applied to case study data for a trichloroethylene-impacted site in Rhode Island. The results of the J&E model and Vol worksheet analyses for this case study predicted incremental carcinogenic risk values for trichloroethylene (TCE) below the risk value calculated based on measured indoor air data. This comparison suggests the potential for other sources of TCE within the building. Groups of parameters were identified for each model that impacted the model-predicted carcinogenic risk. The development of a cost-benefit analysis, which would be used to quantify the value of obtaining additional data for these critical parameters, is recommended for future research.
by Jessica M. Friscia.
M. Eng.
Hirte, Georg, and Stefan Tscharaktschiew. "Does labor supply modeling affect findings of transport policy analyses?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-175627.
Повний текст джерелаTeomete, Egemen. "Mechanics of wire saw machining process experimental analyses and modeling /." [Ames, Iowa : Iowa State University], 2008.
Знайти повний текст джерелаKay, Thomas Sidney. "Numerical Modeling and Analyses of Steel Bridge Gusset Plate Connections." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/84.
Повний текст джерелаBlais, Curtis L. "Social and cultural modeling for Naval analyses project summary 2008-2009." Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/24456.
Повний текст джерелаQiu, Yang. "High-Frequency Modeling and Analyses for Buck and Multiphase Buck Converters." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29804.
Повний текст джерелаPh. D.
Klichowicz, Michael. "Modeling of realistic microstructures on the basis of quantitative mineralogical analyses." OpenD, 2020. https://tubaf.qucosa.de/id/qucosa%3A72835.
Повний текст джерелаThis research aims to make it possible to use realistic mineral microstructures in simulations of mineral processing. In particular, comminution processes, such as the crushing and grinding of raw mineral materials, are highly aff ected by the mineral microstructure, since the texture and structure of the many grains and their micromechanical properties determine the macroscopic fracture behavior. To illustrate this, consider a mineral material that essentially consists of grains of two diff erent mineral phases, such as quartz and feldspar. If the micromechanical properties of these two phases are diff erent, this will likely have an impact on the macroscopic fracture behavior. Assuming that the grains of one of the minerals break at lower loads, it is likely that a crack through a stone of that material will spread through the weaker grains. In fact, this is an important property for ore processing. In order to extract valuable minerals from an ore, it is important to liberate them from the commercially worthless material in which they are found. For this, it is essential to know and understand how the material breaks at grain-size level. To be able to simulate this breakage, it is important to use realistic models of the mineral microstructures. This study demonstrates how such realistic two-dimensional microstructures can be generated on the computer based on quantitative microstructural analysis. Furthermore, the study shows how these synthetic microstructures can then be incorporated into the well-established discrete element method, where the breakage of mineral material can be simulated at grain-size level.:List of Acronyms VII List of Latin Symbols IX List of Greek Symbols XV 1 Introduction 1 1.1 Motivation for using realistic microstructures in Discrete Element Method (DEM) 1 1.2 Possibilities for using realistic mineral microstructures in DEM simulations . 4 1.3 Objective and disposition of the thesis . . . . . . . . . . . . . . . . . . . . 7 2 Background 9 2.1 Discrete Element Method (DEM) . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1.1 Fundamentals of the Discrete Element Method (DEM) . . . . . . . . 9 2.1.2 Applications of DEM in comminution science . . . . . . . . . . . . . 21 2.1.3 Limitations of DEM in comminution science . . . . . . . . . . . . . . 26 2.2 Quantitative Microstructural Analysis . . . . . . . . . . . . . . . . . . . . . 29 2.2.1 Fundamentals of the Quantitative Microstructural Analysis . . . . . . 29 2.2.2 Applied QMA in mineral processing . . . . . . . . . . . . . . . . . . 49 2.2.3 Applicability of the QMA for the synthesis of realistic microstructures 49 3 Synthesis of realistic mineral microstructures for DEM simulations 51 3.1 Development of a computer-assisted QMA for the analysis of real and synthetic mineral microstructures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 3.1.1 Fundamentals of the computer-assisted QMA . . . . . . . . . . . . 53 3.1.2 The requirements for the false-color image. . . . . . . . . . . . . . 54 3.1.3 The conversion of a given real mineral microstructure into a false-color image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.1.4 Implementation of the point, line, and area analysis . . . . . . . . . 59 3.1.5 Selection of appropriate QMA parameters for analyzing two-dimensional microstructures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 3.1.6 Summary of the principles of the adapted Quantitative Microstructural Analysis (QMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 3.2 Analysis of possible strategies for the microstructure synthesis . . . . . . . . 71 3.3 Implementation of the drawing method . . . . . . . . . . . . . . . . . . . . 76 3.3.1 Drawing of a single grain . . . . . . . . . . . . . . . . . . . . . . . 77 XVIII List of Greek Symbols 3.3.2 Drawing of multiple grains, which form a synthetic microstructure . . 81 3.3.3 Synthesizing mineral microstructures consisting of multiple phases . 85 3.4 The final program for microstructure analysis and synthesis . . . . . . . . . 89 3.4.1 Synthesis and analysis of an example microstructure . . . . . . . . . 90 3.4.2 Procedure for generating a realistic synthetic microstructure of a given real microstructure . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 4 Validation of the synthesis approach 103 4.1 Methodical considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 4.1.1 The basic idea of the validation procedure . . . . . . . . . . . . . . 103 4.1.2 The experimental realizations . . . . . . . . . . . . . . . . . . . . . 108 4.2 Basic indenter test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 4.2.1 Considerations for the basic indenter test . . . . . . . . . . . . . . . 109 4.2.2 Realization and evaluation of the real basic indenter test . . . . . . . 114 4.2.3 Realization and evaluation of the simulated basic indenter test . . . 127 4.2.4 Conclusions on the basic indenter test . . . . . . . . . . . . . . . . . 138 4.3 Extended indenter test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 4.3.1 Basic considerations for the extended indenter test . . . . . . . . . . 139 4.3.2 Realization and evaluation of the real extended indenter test . . . . 142 4.3.3 Realization and evaluation of the simulated extended indenter test . 154 4.3.4 Conclusions on the extended indenter test . . . . . . . . . . . . . . 171 4.4 Particle bed test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 4.4.1 Basic considerations for the particle bed test . . . . . . . . . . . . . 173 4.4.2 Realization and evaluation of the real particle bed test . . . . . . . . 176 4.4.3 Realization and evaluation of the simulated particle bed test . . . . . 188 4.4.4 Conclusions on the particle bed test . . . . . . . . . . . . . . . . . . 203 5 Conclusions and directions for future development 205 6 References 211 List of Figures 229 List of Tables 235 Appendix 237
Imagawa, Chie. "Statistical and Modeling Approaches for Hydro-environmental Analyses in Agricultural Watershed." Kyoto University, 2012. http://hdl.handle.net/2433/157692.
Повний текст джерела0048
新制・課程博士
博士(農学)
甲第16901号
農博第1917号
新制||農||998(附属図書館)
学位論文||H24||N4662(農学部図書室)
29576
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 河地 利彦, 教授 村上 章, 教授 川島 茂人
学位規則第4条第1項該当
Wang, Yingqi. "Student Satisfaction Perceived Employability Skills, and Student Engagement: Structural Equation Modeling Analyses." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/99290.
Повний текст джерелаDoctor of Philosophy
It is widely accepted that attracting STEM talents to the U.S. is a key element to maintain the United States' economic supremacy and competitive advantage in a global economy. Asian international students play a significant role to maintain a steady supply of STEM talent pipelines in the U.S. job market. The purpose of this study is to understand the relationships of student engagement with senior student satisfaction and perceived employability skills from STEM fields in the U.S. This study This study was also to identify the relationships of student engagement, student satisfaction, and perceived employability skills across senior Asian international students and their American peers in STEM programs. The results found that both sense of support and relationships with others of emotional engagement were the most important factors to predict college student satisfaction and perceived employability skills. Cognitive engagement had a significant positive influence on student perceived employability skills across all college students, Asian international students, and American students in STEM education. Moreover, this study identified the mediator role of student perceived employability skills on the relationship between student engagement and student satisfaction. Additionally, Asian international students differed from American students regarding academic involvement, participating in extracurricular activities, and sense of support in STEM education. Last but not least, this study supported that the three-dimension student engagement model could apply to U.S. college students. Practical and theoretical implications were discussed and limitations acknowledged.
Fadali, Elizabeth. "Water Use, Virtual Water and Water Footprints| Economic Modeling and Policy Analyses." Thesis, University of Nevada, Reno, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3608707.
Повний текст джерелаThe theme that binds together the four papers in this dissertation is the tracking of physical quantities of water used by industries in the economy, and an exploration of whether and how this tracking could be helpful in informing water policies, as applied to the state of Nevada or sub-regions of Nevada. The concept of water footprints has been wildly popular in disciplines outside of economics and has been used to help make policy decisions normally considered to lie within the economist's realm. Yet many economists shun 'footprints' in general and water footprints in particular, seeing them as descriptive methods that have little or nothing to add to policy analysis. This thesis attempts to bridge a gap between economists, engineers and planners and the popular imagination about what economic concepts footprints are related to and how they can best be used in policy analysis.
Goyal, Vinay K. "Analytical Modeling of the Mechanics of Nucleation and Growth of Cracks." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/30006.
Повний текст джерелаPh. D.
Zanini, Flavio. "Amphibian conservation in human shaped environments : landscape dynamics, habitat modeling and metapopulation analyses /." [S.l.] : [s.n.], 2006. http://library.epfl.ch/theses/?nr=3635.
Повний текст джерелаNakhimovski, Iakov. "Contributions to the Modeling and Simulation of Mechanical Systems with Detailed Contact Analyses." Doctoral thesis, Linköpings universitet, PELAB - Laboratoriet för programmeringsomgivningar, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6342.
Повний текст джерелаLaugwitz, Alexander. "Detailed analyses and numerical modeling of a new multi-staged fluidized-bed gasifier." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-230465.
Повний текст джерелаNachimovskij, Jakov. "Contributions to the modeling and simulation of mechanical systems with detailed contact analyses /." Linköping : Dept. of Computer and Information Science, Linköpings universitet, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6342.
Повний текст джерелаMarzuki, Marza Ihsan. "VMS data analyses and modeling for the monitoring and surveillance of Indonesian fisheries." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0012/document.
Повний текст джерелаMonitoring, control and surveillance (MCS) of marine fisheries are critical issues for the sustainable management of marine fisheries. In this thesis we investigate the space-based monitoring of fishing vessel activities using Vessel Monitoring System (VMS) trajectory data in the context of INDESO project (2013-2017). Our general objective is to develop a processing chain of VMS data in order to: i) perform a follow-up of the fishing effort of the Indonesian longline fleets, ii) detect illegal fishing activities and assess their importance. The proposed approach relies on classical latent class models, namely Gaussian Mixture Models (GMM) and Hidden Markov Models (HMM), with a view to identifying elementary fishing vessel behaviors, such as travelling, searching and fishing activities, in a unsupervised framework. Following state-of-the-art approaches, we consider different parameterizations of these models with a specific focus on Indonesian longliners, for which we can benefit from at-sea observers¿ data to proceed to a quantitative evaluation. We then exploit these statistical models for two different objectives: a) the discrimination of different fishing fleets from fishing vessel trajectories and the application to the detection and assessment of illegal fishing activities, b) the assessment of a spatialized fishing effort from VMS data. We report good recognition rate (about 97%) for the former task and our experiments support the potential for an operational exploration of the proposed approach. Due to limited at-sea observers¿ data, only preliminary analyses could be carried out for the proposed VMS-derived fishing effort. Beyond potential methodological developments, this thesis emphasizes the importance of high-quality and representative at-sea observer data for further developing the exploitation of VMS data both for research and operational issues
Cao, Libo. "Nonlinear Wavelet Compression Methods for Ion Analyses and Dynamic Modeling of Complex Systems." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1107790393.
Повний текст джерелаRouhani, Siamak. "Temperature analyses of Concrete Frame Bridges with Finite Elements." Thesis, KTH, Bro- och stålbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145904.
Повний текст джерелаVogel, Thibaut. "Multiphysics analyses and modeling for the development of composite structures with embedded electrical wires." Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4093/document.
Повний текст джерелаFrom the study of a particular multifunctional composite structure, this thesis aims at analyzing the thermomechanical behavior and failure modes of a composite structure embedding electrical wires. Representative test specimens embedding flat electrical cables are manufactured and tested under various conditions. The influence of out-of-plane loadings, and especially of low energy impacts on the electro-mechanical functionality of the structure is then investigated with both experimental and numerical considerations. Post impact electrical tests such as resistance measurements and dielectric strength tests are carried out to investigate on the post-impact electrical performances of the structure. Then, resistive heating of the embedded electrical components combined to the thermal environment of an aerospace structure lead us to further investigate on the thermo-mechanical behaviour of such multi-layered multi-materials structures. Hence, a methodology using Dynamic Mechanical Analysis (DMA) testings is developed to characterize both the temperaturedependent stiffness of the constituents, and the resulting thermo-mechanical behaviour of the assembly. The main contribution of this work consists in determining electrical degradation and sizing criteria for the development of robust composite structures embedding electrical wires
Lu, Xiaosun. "Statistical Modeling and Prediction of HIV/AIDS Prognosis: Bayesian Analyses of Nonlinear Dynamic Mixtures." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5258.
Повний текст джерелаEpstein, David M. "15N Tracer and Modeling Analyses of Nutrient Transport Through Lakes in a Subalpine Watershed." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/932.
Повний текст джерелаDeng, Cheng. "Analyses conformationnelles de nouveaux systèmes organisés biomimétiques." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0247/document.
Повний текст джерелаThe subject of this thesis deals with the structural studies of a new generation of oligomers, so called foldamers, constructed from pseudopeptidic mimics and able to adopt determined secondary structures. Three families of oligomers were investigated. For each oligomer several spectroscopic methods have been used combined with molecular modeling in order to characterize their structural properties. The first family was studied in collaration with the group of Muriel Amblard and Monique Calmès at IBMM in Montpellier. We have evaluated the structural properties of the motif (S)-ABOC. Several oligomers of varying sizes were synthesized and we have shown that the pattern (S)-ABOC, when introduced into a peptide sequence, is capable of generating beta turn. The sequence of these turn leads to the formation of helices, which, according to associated pseudo-peptide patterns shows different characteristics. The second project discussed the conformation of oligomers family formed from constrainted thiazole monomers. We have shown that this pattern developed by Ludovic Maillard at IBMM in Montpellier adopted pseudocycles C9 which led to helices. THis property was observed starting from the tetramer. The third family of oligomers comes from the LCPM, alternating oligomers of alpha amino acids and aza amino acids, in which the alpha carbon has been replaced by a nitrogen atom. We showed that the pattern aza induces folding of the beta turn, facilitating the cyclization of the molecule. In this thesis we have characterized the properties to self-structuring of three families of pseudopeptide foldamers by combining experimental results from nuclear magnetic resonance, infrared spectroscopy, circular dichroism and X-ray diffraction combined with molecular modeling calculations. Our study lists the properties of each pattern to form secondary structure elements and to induce the formation of foldamers
Takemoto, Hironori. "Morphological Analyses and 3-D Modeling of the Tongue Musculature in the Human and Chimpanzee." 京都大学 (Kyoto University), 2000. http://hdl.handle.net/2433/151666.
Повний текст джерелаMitchell, Caleb. "Finite Element Analyses and Proposed Strengthening of a Reinforced Concrete Box Girder Bridge Subjected to Differential Settlement." Thesis, Kansas State University, 2018. http://hdl.handle.net/2097/38789.
Повний текст джерелаDepartment of Civil Engineering
Hayder A. Rasheed
The Kansas Department of Transportation’s (KDOT) Bridge 059-045 is a reinforced concrete box girder bridge constructed in 1965 to connect the rural Shawnee Drive across Interstate 135 near McPhearson, Kansas, in between Salina and Wichita. The bridge was observed, during an annual inspection in 1998, to have experienced some settlement, which was further found to be due to its proximity to a sinkhole. This settlement progressed to noticeable levels in 2012 necessitating a semi-annual elevation profile survey that was consistently conducted by KDOT. In April 2016, KDOT determined that the bridge required a detailed finite element analysis to determine the safety and suitability of the bridge to stay open to traffic. Accordingly, a two-level Finite Element Analysis was performed using RISA 3D and Abaqus to assess the level of distress in the bridge due to the continuous differential settlement as a result of the active sinkhole deep in the soil under the bridge. The force-moment results were taken from the RISA 3D model for further analysis of various structural components that make up the bridge, including the box girder, piers, and piles. The stress distribution results from the Abaqus model were investigated for the same components of the bridge. A strengthening design scheme using near surface mounted fiber reinforced polymer rebar was developed to extend the service life of the bridge.
Raymond, Scott David. "On modeling of the weld line in finite element analyses of tailor-welded blank forming operations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2002. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65644.pdf.
Повний текст джерелаRichards, Sarah [Verfasser], and Laura [Akademischer Betreuer] Rose. "Mathematical Modeling and Evolutionary Analyses of Cell-Surface Signaling in Plants / Sarah Richards ; Betreuer: Laura Rose." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2018. http://d-nb.info/1161606270/34.
Повний текст джерелаRichards, Sarah Rose [Verfasser], and Laura [Akademischer Betreuer] Rose. "Mathematical Modeling and Evolutionary Analyses of Cell-Surface Signaling in Plants / Sarah Richards ; Betreuer: Laura Rose." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2018. http://d-nb.info/1161606270/34.
Повний текст джерелаShehadeh, Mu'Tasem A. "Modeling of high strain rate and strain localization in FCC single crystals multiscale dislocation dynamics analyses /." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Spring2005/M%5FShehadeh%5F050405.pdf.
Повний текст джерелаAbu-Sheikh, Khalil. "Reviewing and Evaluating Techniques for Modeling and Analyzing Security Requirements." Thesis, Blekinge Tekniska Högskola, Avdelningen för programvarusystem, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6203.
Повний текст джерелаTindall, Nathaniel W. "Analyses of sustainability goals: Applying statistical models to socio-economic and environmental data." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54259.
Повний текст джерелаWen, Sihua. "Thermal and Thermo-Mechanical Analyses of Wire Bond vs. Three-dimensionally Packaged Power Electronics Modules." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/30823.
Повний текст джерелаMaster of Science
Ozcan, Omer Can. "Stability Analyses Of The Dump Site Culvert In Tinaz Surface Mine." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1122423/index.pdf.
Повний текст джерелаSamper, Ludovic. "Modélisations et analyses de réseaux de capteurs." Phd thesis, Grenoble INPG, 2008. http://tel.archives-ouvertes.fr/tel-00283716.
Повний текст джерелаApplication de méthodes de validation formelle au cas des réseaux de capteurs.
Etude de cas du projet ANR ARESA.
Wei, Haiyan. "Improved Estimation of Splash and Sheet Erosion in Rangelands: Development and Application of a New Relationship and New Approaches for Sensitivity and Uncertainty Analyses." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195122.
Повний текст джерелаJayaraman, Krishnan. "Effect of the interphase on the thermo-mechanical response of unidirectional fiber-reinforced epoxies : modeling, analyses and experiments /." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-02262007-095957/.
Повний текст джерелаBurney, David. "Modeling the magmatic plumbing system beneath an off-rift volcanic deposit on Iceland, using textural analyses and geothermobarometry." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/1831.
Повний текст джерелаTomar, Vikas. "Atomistic modeling of the AL and Fe₂O₃ material system using classical molecular dynamics." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7502.
Повний текст джерелаHirakawa, Takashi. "Novel Analyses on Single Shunt Rectifiers for Microwave Wireless Power Transmission." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263668.
Повний текст джерелаAdotey, Bless. "MATHEMATICAL MODELING OF CLOSTRIDIUM THERMOCELLUM’S METABOLIC RESPONSES TO ENVIRONMENTAL PERTURBATION." UKnowledge, 2011. http://uknowledge.uky.edu/bae_etds/1.
Повний текст джерелаLedru, Yohann. "Etude de la porosité dans les matériaux composites stratifiés aéronautiques." Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT048G/document.
Повний текст джерелаLong fiber reinforced epoxy matrix composite laminate manufacturing process is divided into several stages. The most critical one is the polymerization stage. If not optimized, defects in the bulk material such as voids can occur. The aim of this work is to investigate the void formation and evolution processes in order to improve the thermoset laminates quality in minimizing the void ratio. Two phenomena causing void formation have been identified. The first is the mechanical entrapment of gas bubbles between prepreg plies during the lay up. Second is a thermodynamical one. Solvents and humidity absorbed by the prepreg during its manufacturing can be evaporated by increasing the temperature. Then, it has been shown that the vaccum bag lay up permeability in combination with the vaccum pressure could favour the gas washing out. In parallel, thermo-mechanical and diffusion models are coupled to obtain an accurate void size prediction along temperature and pressure applied during the polymerisation. In fact, these two parameters induce variations of the gas bubble radius inside resin. The first experimental results seem to validate qualitatively the calculated void size behaviour. Indeed, hydrostatic pressure imposed during polymerization plays a very important role on gas bubble shrinkage. Finally, a new experimental setup using image analyses has been developed to measure as accurate as possible the volume void ratio. Under specific conditions, stereology allows to extrapolate 2D results to 3D ones. Void ratios obtained with this method are in good agreement with acid digestion results. Complementary morphometric studies on void shapes have given new information about the heterogeneous void distribution in the specimen and also on the statistical void size distribution versus polymerization conditions
Mohajeri, Arash. "Effective diffusion coefficients for charged porous materials based on micro-scale analyses." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/5780.
Повний текст джерелаIn the first part of this thesis a numerical method based on a recently proposed up-scaled Poisson-Nernst-Planck type of equation (PNP) and its microscale counterpart is employed to estimate the tortuosity and thus the effective and apparent diffusion coefficients in thin charged membranes. Beside this, a new mathematical approach for estimation of tortuosity is applied and validated. This mathematical approach is also derived while upscaling of micro-scale Poisson-Nernst-Planck system of equations using the volume averaging method. A variety of different pore 2D and 3D micro-geometries together with different electrochemical conditions are studied here. To validate the new approaches, the relation between porosity and tortuosity has been obtained using a multi-scale approach and compared with published results. These include comparison with the results from a recently developed numerical method that is based on macro and micro-scale PNP equations.
Results confirm that the tortuosity value is the same for porous media with electrically uncharged and charged particles but only when using a consistent set of PNP equations. The effects of charged particles are captured by the ratio of average concentration to effective intrinsic concentration in the macroscopic PNP equations. Using this ratio allows to consistently take into account electro-chemical interactions of ions and charges on particles and so excludes any ambiguity generally encountered in phenomenological equations.
Steady-state diffusion studies dominate this thesis; however, understanding of transient ion transport in porous media is also important. The last section of this thesis briefly introduces transient diffusion through bentonite. To do so, the micro Nernst-Planck equation with electro-neutrality condition (NPE) is solved for a porous medium which consists of compacted bentonite. This system has been studied before in another research using an experimental approach and the results are available for both transient and steady-state phases. Three different conditions are assumed for NPE governing equations and then the numerical results from these three conditions are compared to the experimental values and analytical phenomenological solution. The tortuosity is treated as a fitting parameter and the effective diffusion coefficient can be calculated based on these tortuosity values. The results show that including a sorption term in the NPE equations can render similar results as the experimental values in transient and steady state phases. Also, as a fitting parameter, the tortuosity values were found varying with background concentration. This highlights the need to monitor multiple diffusing ion fluxes and membrane potential to fully characterize electro-diffusive transport from fundamental principles (which have been investigated in first part of this thesis) rather than phenomenological equations for predictive studies.
This research has lead to two different journal articles submissions, one already accepted in Computers and Geotechnics (October 22, 2009, 5-yrs Impact Factor 0.884) and the other one still under review.
Cakir, Murat. "Development And Validation Of B2c E-commerce Adoption Model: An Empirical Investigation Using Structural Equation Modeling And Interpretative Phenomenological Analyses." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614895/index.pdf.
Повний текст джерелаBernard, Julien. "Capacité érosive des écoulements pyroclastiques : impact sur les budgets éruptifs et implications pour l'aléa." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22553/document.
Повний текст джерелаPyroclastic flows (PFs) are hot mixtures of gas and particles that represent the most deadly volcanic hazard. To protect the populations, it is necessary to work on precise risk maps, which require having a deep knowledge of these phenomena. However, the causes and consequences of erosion and incorporation of non-juvenile material during PFs emplacement remain poorly known. This thesis aims at characterizing the erosive capacity of pyroclastic flows, defining erosion mechanisms and quantifying their impact on eruptive budgets and associated hazards. Here, we focus on small-volume PFs and use an approach based on field and textural investigations coupled with numerical modeling of PFs emplacement. The August 2006 PF-forming eruption of Tungurahua volcano (Ecuador) is used as a case-study for this work.An original method, based on high-resolution, stereologically-corrected image analyses, detailed textural analyses of PFs deposits and mass budget, enables determining the grain size distribution and the componentry of PFs products along their entire clast size range. Volume calculation and mass budgets show that about 50 wt. % of the whole deposit consists of non-juvenile materials incorporated during PFs emplacement, and mostly coming from the upper part of the volcano. The slope is a prevailing parameter that controls PFs erosive power. Eruptive budgets support a VEI 3 event (0.09 km 3 ) for the 2006 eruption of Tungurahua and highlight the importance of separating juvenile from non-juvenile material. Detailed analyses of deposits’ componentry suggest a strong dynamic density-driven segregation of the clasts during PFs emplacement, associated with sedimentation rates of ≈10 cm.s -1 . Lateral variations of lithological, grain size, and morphological data demonstrate the occurrence of componentry-driven clast fragmentation and abrasion processes. Massive components (e.g. old lavas) are the main grinding agents of scoriaceous components (e.g. bombs). During emplacement, these processes continuously create fine grained populations, which are transferred from the main dense flow to pyroclastic surge or Co-PF cloud. Numerical models of erosive PFs based on a new erosion law integrated into VolcFlow code show the ability of plastic rheology to reproduce natural erosion patterns of PFs. The erosion is produced by dynamic variations of normal stress / shear stress ratio during emplacement, due to thickness unsteadiness during flow deceleration. The thin, highly frictional and erosive front of PFs pulses is pushed by the thicker and non-erosive head and flow body. Incorporation implies longer PFs runouts of about 10-30%, depending on the amount of incorporated material, which is related to the quantity of erodible material available on the volcano’s flanks before the eruption. These results show that erosion has a significant role on PFs runouts, and thus in hazard assessment, which should be closely taken into account in future works
Jreich, Rana. "Distribution verticale du carbone dans les sols - Analyse bayésienne des profils des teneurs en carbone et de C14." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV060/document.
Повний текст джерелаGlobal warming is a major issue for both the scientific world and societies. The concentration of carbon dioxide has increased by 45% since the pre-industrial era (Harris, 2010) as a consequence of human activities, unbalancing the global carbon cycle. This results in global warming with dramatic impacts on the Earth, particularly for fragile populations.Amongst mitigation solutions, a better use of soil is proposed. Soils have the largest capacity of carbon exchanges with the atmosphere and contain a large stock of carbon. A tiny increase in this soil carbon stock and in carbon exchanges between atmosphere and soil would be more favorable to soil carbon sequestration and would compensate for carbon emissios from burning fossil fuel. However, soil carbon dynamics still suffers from insufficient knowledge. There remains therefore a huge uncertainty about the soil carbon response to climate and land-use changes.While several mechanistic models have been developed to better understand the dynamics of soil carbon, they provide an incomplete view of the physical processes affecting soil organic matter (OM). It will be long before a complete and updated soil dynamics model becomes available.In my thesis, I propose a Bayesian statistical model aiming at describing the vertical dynamics of soil carbon. This is done thanks to the modeling of both soil organic carbon and of radiocarbon data as they illustrate the residence time of organic matter and thus the soil carbon dynamics. The purpose of this statistical approach was to better represent the uncertainties on soil carbon dynamics and to quantify the effects of climatic and environmental factors on both surface and deep soil carbon.This meta-analysis was performed on a database of 344 profiles, collected from 87 soil science papers and the literature in archeology and paleoclimatology, under different climate conditions (temperature, precipitation, etc.) and environments (soil type and type of ecosystem).A hierarchical non-linear model with random effects was proposed to model the vertical dynamics of radiocarbon as a function of depth. Bayesian selection techniques, recently published, were applied to the latent layers of the model, which in turn are linked by a linear relationship to the climatic and environmental factors. The Bayesian Group Lasso with Spike and Slab Prior (BGL-SS), the Bayesian Sparse Group Selection (BSGS) and the Bayesian Effect Fusion model-based clustering (BEF) were tested to identify the significant categorical explanatory predictors (soil type, ecosystem type) and the Stochastic Search Variable Selection method to identify the influential numerical explanatory predictors. A comparison of these Bayesian techniques was made based on the Bayesian model selection criteria (the DIC (Deviance Information Criterion), the Posterior Predictive Check, etc.) to specify which model has the best predictive and adjustment power of the database profiles. In addition to selecting categorical predictors, the BSGS allows the formulation of an a posteriori inclusion probability for each level within the categorical predictors such as soil type and ecosystem type (9 soil types and 6 ecosystem types were considered in our study). Furthermore, the BEF made it possible to merge the types of soil as well as the types of ecosystem, which according to the BEF, are considered to have the same effects on the responses of interest here, such as the response of the topsoil radiocarbon.The application of these techniques allowed us to predict, on average and on a global level, the vertical dynamics of the radiocarbon in the case of a temperature increase of 1, 1.5 and 2 °C, and in the case of a change in vegetation cover. For example, we studied the impact of deforesting tropical forests and replacing them by cultivated land on soil carbon dynamics. The same statistical analysis was also done to better understand the vertical dynamics of soil carbon content