Dissertations / Theses on the topic 'Structural and parametric adaptation'
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Gao, Haotian. "POD-Galerkin based ROM for fluid flow with moving boundaries and the model adaptation in parametric space." Diss., Kansas State University, 2018. http://hdl.handle.net/2097/38776.
Full textDepartment of Mechanical and Nuclear Engineering
Mingjun Wei
In this study, a global Proper Orthogonal Decomposition (POD)-Galerkin based Reduced Order model (ROM) is proposed. It is extended from usual fixed-domain problems to more general fluid-solid systems with moving boundaries/interfaces. The idea of the extension is similar to the immersed boundary method in numerical simulations which uses embedded forcing terms to represent boundary motions and domain changes. This immersed boundary method allows a globally defined fixed domain including both fluid and solid, where POD-Galerkin projection can be directly applied. However, such a modified approach cannot get away with the unsteadiness of boundary terms which appear as time-dependent coefficients in the new Galerkin model. These coefficients need to be pre-computed for prescribed periodic motion, or worse, to be computed at each time step for non-prescribed (e.g. with fluid-structure interaction) or non-periodic situations. Though computational time for each unsteady coefficient is smaller than the coefficients in a typical Galerkin model, because the associated integration is only in the close neighborhood of moving boundaries. The time cost is still much higher than a typical Galerkin model with constant coefficients. This extra expense for moving-boundary treatment eventually undermines the value of using ROMs. An aggressive approach is to decompose the moving boundary/domain to orthogonal modes and derive another low-order model with fixed coefficients for boundary motion. With this domain decomposition, an approach including two coupled low-order models both with fixed coefficients is proposed. Therefore, the new global ROM with decomposed approach is more efficient. Though the model with the domain decomposition is less accurate at the boundary, it is a fair trade-off for the benefit on saving computational cost. The study further shows, however, that the most time-consuming integration in both approaches, which come from the unsteady motion, has almost negligible impact on the overall dynamics. Dropping these time-consuming terms reduces the computation cost by at least one order while having no obvious effect on model accuracy. Based on this global POD-Galerkin based ROM with forcing term, an improved ROM which can handle the parametric variation of body motions in a certain range is also presented. This study shows that these forcing terms not only represent the moving of the boundary, but also decouple the moving parameters from the computation of model coefficients. The decoupling of control parameters provides the convenience to adapt the model for the prediction on states under variation of control parameters. An improved ROM including a shit mode seems promising in model adaptation for typical problems in a fixed domain. However, the benefit from adding a shit mode to model diminishes when the method is applied to moving-boundary problems. Instead, a combined model, which integrates data from a different set of parameters to generate the POD modes, provides a stable and accurate ROM in a certain range of parametric space for moving-boundary problems. By introducing more data from a different set of parameters, the error of the new model can be further reduced. This shows that the combined model can be trained by introducing more and more information. With the idea of the combined model, the improved global ROM with forcing terms shows impressive capability to predict problems with different unknown moving parameters, and can be used in future parametric control and optimization problems.
Normann, James Brian. "Parametric identification of nonlinear structural dynamic systems." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43294.
Full textMaster of Science
Malladi, Sailaja. "Parametric modeling and analysis of structural bonded joints." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=80.
Full textTitle from document title page. Document formatted into pages; contains x, 56 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 52-53).
Danhaive, Renaud Aleis Pierre Emile. "Integrating interactive evolutionary exploration and parametric structural design." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99595.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 47-48).
Current modeling and analysis tools are extremely powerful and allow one to generate and analyze virtually any structural shape. However, most of them do not allow designers to integrate structural performance as an objective during conceptual design. As structural performance is highly linked to architectural geometry, there is a need for computational strategies allowing for performance-oriented structural design in architecture. In order to address these issues, this research combines interactive evolutionary optimization and parametric modeling to develop a new computational strategy for creative and high-performance conceptual structural design. Parametric modeling allows for quick exploration of complex geometries and can be combined with analysis and optimization algorithms for performance-driven design. However, this methodology often questions the designer's authorship as it is based on the use of black-box optimizers. On the other hand, interactive evolutionary optimization empowers the user by acknowledging his or her input as fundamental and includes it in the evolutionary optimization process. This approach aims at improving the structural performance of a concept without limiting the creative freedom of designers. Taking advantage of the two frameworks, this research implements an interactive evolutionary structural optimization framework in the widely used parametric modeling environment constituted by Rhinoceros and Grasshopper. Previous work has illustrated the benefits of combining parametric modeling and genetic algorithms for design space exploration. Comparatively, the implemented design tool capitalizes on Grasshopper's versatility for geometry generation but supplements the visual programming interface with a flexible portal increasing the designer's creative freedom through enhanced interactivity. The tool can accommodate a wide range of structural typologies and geometrical forms in an integrated environment. This research offers a versatile, performance- and user-oriented environment for creative and efficient conceptual structural design.
by Renaud Aleis Pierre Emile Danhaive.
M. Eng.
Jones, Garrett P. (Garrett Pierce). "Interoperable software for parametric structural analysis and optimization." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82713.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis. "June 2013."
Includes bibliographical references (p. 62-64).
The advent of building information modeling in the structural engineering profession has brought forth new challenges to the traditional methods of design and analysis. The need for faster, more robust analyses to mitigate expenses and increase structural insight is a demand that stems from the implementation of BIM modeling. Current software interoperability now allows engineers limited opportunity to engage directly and immediately with the design process. The development of tools which can bring together the architectural and structural engineering professions are of paramount importance in the next phase of professional design. In response to this professional demand, a software framework for Rhino3D modeling software was created which explores the various methods of searching a design space and finding solutions. Both parametric design generation and genetic optimizations were employed, allowing architects and engineers to explore the design space of a structure using metrics important to each field. A case study is performed using the developed software framework to quantify results and validate the effectiveness of such a new design tool in the current engineering profession. The outcome is an improved design experience that is feasible in time and scope, allowing architects and engineers an opportunity to truly explore the design space. Keywords: Parametric modeling and analysis, Genetic optimization, Building information modeling
by Garrett P. Jones.
M.Eng.
Stefan, Diana. "Structural and parametric identification of bacterial regulatory networks." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENM019/document.
Full textHigh-throughput technologies yield large amounts of data about the steady-state levels and the dynamical changes of gene expression in bacteria. An important challenge for the biological interpretation of these data consists in deducing the topology of the underlying regulatory network as well as quantitative gene regulation functions from such data. A large number of inference methods have been proposed in the literature and have been successful in a variety of applications, although several problems remain. We focus here on improving two aspects of the inference methods. First, transcriptome data reflect the abundance of mRNA, whereas the components that regulate are most often the proteins coded by the mRNAs. Although the concentrations of mRNA and protein correlate reasonably during steady-state growth, this correlation becomes much more tenuous in time-series data acquired during growth transitions in bacteria because of the very different half-lives of proteins and mRNA. Second, the dynamics of gene expression is not only controlled by transcription factors and other specific regulators, but also by global physiological effects that modify the activity of all genes. For example, the concentrations of (free) RNA polymerase and the concentration of ribosomes vary strongly with growth rate. We therefore have to take into account such effects when trying to reconstruct a regulatory network from gene expression data. We propose here a combined experimental and computational approach to address these two fundamental problems in the inference of quantitative models of the activity of bacterial promoters from time-series gene expression data. We focus on the case where the dynamics of gene expression is measured in vivo and in real time by means of fluorescent reporter genes. Our network reconstruction approach accounts for the differences between mRNA and protein half-lives and takes into account global physiological effects. When the half-lives of the proteins are available, the measurement models used for deriving the activities of genes from fluorescence data are integrated to yield estimates of protein concentrations. The global physiological state of the cell is estimated from the activity of a phage promoter, whose expression is not controlled by any transcription factor and depends only on the activity of the transcriptional and translational machinery. We apply the approach to a central module in the regulatory network controlling motility and the chemotaxis system in Escherichia coli. This module comprises the FliA, FlgM and tar genes. FliA is a sigma factor that directs RNA polymerase to operons coding for components of the flagellar assembly. The effect of FliA is counteracted by the antisigma factor FlgM, itself transcribed by FliA. The third component of the network, tar, codes for the aspartate chemoreceptor protein Tar and is directly transcribed by the FliA-containing RNA polymerase holoenzyme. The FliA-FlgM module is particularly well-suited for studying the inference problems considered here, since the network has been well-studied and protein half-lives play an important role in its functioning. We stimulated the FliA-FlgM module in a variety of wild-type and mutant strains and different growth media. The measured transcriptional response of the genes was used to systematically test the information required for the reliable inference of the regulatory interactions and quantitative predictive models of gene regulation. Our results show that for the reliable reconstruction of transcriptional regulatory networks in bacteria it is necessary to include global effects into the network model and explicitly deduce protein concentrations from the observed expression profiles. Our approach should be generally applicable to a large variety of network inference problems and we discuss limitations and possible extensions of the method
Saman, Nariman Goran. "A Framework for Secure Structural Adaptation." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-78658.
Full textMasendeke, Rugare B. "Parametric study of stiffened steel containment shell structures." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/19019.
Full textA FEM-based parametric study is undertaken to investigate the buckling behavior of meridionally and circumferentially stiffened steel cylindrical and conical shell frustum subjected to different load cases. This situation arises in different steel shell applications such as storage vessels (liquid, solid and gas) and in certain configurations of industrial process facilities. The stiffeners are flat strips of rectangular section welded on to the outer surface of the shell, either over the whole length of the shell meridian or around the circumference of the shell. It is required to establish how the elastic buckling load and mode shapes vary with respect to certain key parameters of the problem. The parameters of interest in the study include the number of stiffeners around the shell circumference and along the meridian, the stiffener-depth to shell-thickness ratio, and the stiffener depth-to-width ratio. This thesis reports the findings of the parametric study and also presents some results of experimental tests on laboratory small-scale models of stiffened cylindrical and conical frusta.
Sareen, Samita. "Estimation and testing of structural parametric sealed-bid auctions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0026/NQ49879.pdf.
Full textWorden, Keith. "Parametric and nonparametric identification of nonlinearity in structural dynamics." Thesis, Heriot-Watt University, 1989. http://hdl.handle.net/10399/1033.
Full textYanik, Yasar. "Quantification of parametric uncertainties effects in structural failure criteria /." Ilha Solteira, 2019. http://hdl.handle.net/11449/182040.
Full textResumo: Critérios de falhas realizam a predição de circunstâncias nas quais materiais sólidos estão sobre ação de carregamentos externos. As teorias de falhas são conhecidas como diferentes critérios de falhas, como von Mises e Tresca, os quais são os mais famosos para determinados materiais. Além disso, esta dissertação de mestrado pretende mostrar a comparação entre os critérios de falha de Tresca e von Mises, levando em conta incertezas subjacentes nas equações constitutivas e na análise de tensão. Para exemplificar acomparação,algumassimulaçõessãorealizadasusandoumaplacasimples,umproblema de deflexão simples,e a estrutura de um carro do formula SAE. Devido à complexidade deste sistema, diferentes tipos de etapas probabilísticas são utilizadas, como o método de superfície de resposta e a correlação de parâmetros. Os resultados mostram que várias variáveis aleatórias de entrada afetam em maneiras diferentes as variáveis aleatórias de saída e que não há uma diferença grande entre os critérios de falha de von Mises e Tresca quando incertezas são assumidas na formulação para a análise de tensão.
Abstract: Failure theory is the investigation of predicting circumstances under which solid materials under the processing of external loads. The theories of failure are known as different failure criteria such as von Mises and Tresca which are the most famous of these for certain materials. Additionally, this master dissertation intends to show a comparison between Tresca and von Mises failure criterions, taking into account the underlying uncertainties in the constitutive equations and stress analysis. In order to exemplify the comparison, some numerical simulations are performed using a simple plate, simple deflection problem and a frame of the formula car. Due to the complexity of frame of the formula car, different kind of probabilistic steps are used as a response surface method and parameters correlation. Results show that several random input variables effect the random output variables in various ways, and there is no such a big difference between the von Mises and Tresca failure criterions when uncertainties are assumed in the formulation for stress analysis.
Mestre
Anderson, Matthew Francis. "Parametric investigation of strain gauges in structural damage detection." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/2436.
Full textSeckiner, Soner. "Parametric Analysis Of Inelastic Interaction In Frame-wall Structural Systems." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613654/index.pdf.
Full textGentry, Jeanette J. "Nonlinear oscillations under multifrequency parametric excitation." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43402.
Full textA second-order system of differential equations containing a multifrequency parametric excitation and weak quadratic and cubic nonlinearities is investigated. The method of multiple scales is used to carry out a general analysis, and three resonance conditions are considered in detail. First, the case in which the sum of two excitation frequencies is near two times a natural frequency, λs + λt ~2Ï q, is examined. Second, the influence of an internal resonance, Ï q~3Ï r, on the previous case is studied. Finally, the effect of the internal resonance wr~3wq on the resonance λs + λt ~2Ï q is investigated. Results are presented as plots of response amplitudes as functions of a detuning parameter, excitation amplitude, and, for the first case, a measure of the relative values of λs + λt.
Master of Science
Pentaris, Fragkiskos. "Digital signal processing for structural health monitoring of buildings." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/10560.
Full textBasile, Franklin C. "Parametric shape generation of aerodynamic and structural objects for aerodynamic, structural and radar cross-section analysis." Master's thesis, University of Central Florida, 1988. http://digital.library.ucf.edu/cdm/ref/collection/RTD/id/79106.
Full textThis thesis describes the design and development of software to parametrically build three-dimensional aerodynamic objects or shapes for various engineering design and analysis activities. The software is designed to generate and display sufficient geometric output to completely define the object. Parameters are entered through a prompting sequence which determines the type of object and the amount of geometry needed to describe the object. Geometry created by this program will act as the baseline model for aerodynamic , structural, and radar cross-section analysis. An integral part of the program is the complete 3-D viewing capability. Interactive global display capability allows for visualization of the model from any direction. Input of a viewing direction or an eye-point position will automatically shift the viewer to the correct orientation in space while scaling and centering the model on teh display. Once the object geometry has been verified and accepted, it is converted to a surface model by a second program developed at the Martin Marietta Orlando Aerospace Company, and formatted for input into aerodynamic analysis programs such as S-HABP (Supersonic-Hypersonic Arbitary Body Program) for lift and drag calcuations at multiple angles of attack and trim conditions and/or CAMS (Computer Aided Missile Synthesis) for trajectory data calculations under various flight regimes. The geometry may also be formatted for input to the stress and dynamic mode analysis program NASTRAN or the physical optics scattering program POSCAT which is used to predict radar signal returns of an object at any desired frequency. Program design, geometry generation, and data manipulation techniques are presented in detail.
M.S.
Masters
Engineering
Engineering
182 p.
viii, 182 leaves, bound : ill. ; 28 cm.
Lagergren, Maria. "Parametric model for structural stability computation of chassis in tipper trailers." Thesis, KTH, Hållfasthetslära (Inst.), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92642.
Full textPajkert, Anna Ewa. "Behavioural and Structural Adaptation to Hippocampal Dysfunction in Humans." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21757.
Full textApplying knowledge flexibly to new situations is a cognitive faculty that is necessary in every-day life. Previous findings emphasise the crucial role the hippocampus plays in learning and linking new information with pre-existing knowledge. However, the functional integrity of the hippocampus changes over the lifespan and is frequently affected by neuropsychiatric disorders. The affected subjects must, therefore, develop adaptive strategies to achieve behavioural goals. Thus, my doctoral thesis deals with adaptation processes in the developing brain and in adult brains with a hippocampal dysfunction. This synopsis encompasses three studies on: (1) behavioural strategies in the developing brain, (2) behavioural strategies in the lesioned fully developed brain, and (3) structural changes in the lesioned fully developed brain. Study 1 suggests an age-related shift in the associative memory: Children, adolescents, and young adults use different memory strategies when integrating information. Study 2 suggests that the memory deficits observed in patients with right-sided hippocampal lesions are not merely a consequence of an impaired associative memory but rather result from an additional hippocampal contribution to the memory integration. Study 3 suggests that postoperative structural adaptation processes occur on a surprisingly short time-scale, and this structural reorganisation happens not only in the hippocampus but also in distant brain areas connected to the hippocampus. In conclusion, findings from these three studies show that adaptation processes in the developing brain and in adult brains with hippocampal dysfunction occur on both the behavioural and the structural level.
Govender, Nishalin. "A parametric investigation into the membrane stresses of hydrostatically loaded circular and elliptic toroidal shells." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25284.
Full textGruionu, Gabriel. "Structural adaptation of arcade arteries to changes in blood flow." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280607.
Full textWallin, Daniel, and Martin Wasberg. "Parametric design of building structures in cooperation with architects : Usage and evaluation of structural plug-ins in 3D visualisation software." Thesis, KTH, Betongbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188948.
Full textMartinez-Sanchis, Elena. "Essays on identification and estimation of structural parametric and semiparametric models in microeconomics." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1444804/.
Full textStinton, Graham William. "Structural studies into AM(_2)O(_7) framework materials and parametric Rietveld refinement." Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2436/.
Full textWang, Lyang Suan. "Automating Parametric Redesign of Structural Thin-Walled Frames Based On Topology Optimized Structure." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu156618342438725.
Full textEranki, Venkata Krishna Prashanth, and Gurudu Rishank Reddy. "Design and Structural Analysis of a Robotic Arm." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13834.
Full textMokhuthu, Batho. "Parametric study on the buckling behaviour of singly and doubly curved concrete arch dams." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11421.
Full textSweeney, Blake Alexander. "Development of a System for Studying Temperature Adaptation of Structural RNAS." Bowling Green State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1321542150.
Full textOueini, Shafic Sami. "Techniques for Controlling Structural Vibrations." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/27176.
Full textPh. D.
Lanzas, Lourdes Eneida 1962. "A parametric study on the behavior of slender reinforced concrete frames." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276945.
Full textKahn, Sergey. "Thinking Outside The Grid: Structural Design Through Multi-parametric Growth and Self-Adaptive Analysis." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491317566570458.
Full textBondarchuk, M. S., and М. С. Бондарчук. "The use of parametric principles in the elements of park architecture." Thesis, Національний авіаційний університет, 2020. http://er.nau.edu.ua/handle/NAU/42093.
Full textThe beginning of XXI century is marked by the emergence of research, experimentation and implementation in the direction of “paramentric”. Parametric principles have been applied in the design of architectural elements of the park. Based on the research, we can conclude that in the design of parks the direction of parametricism is a really new avant-garde style. It largely relies on the structural, constructive and formative principles of nature, thereby continuing to develop the organic approach to a new level. The main feature of parametricism is the appeal to nonlinear forms, which brings it closer to bionic architecture. Thus, this new style is a natural step in the development of modern park architecture and integrates its achievement in the formation, relying on new design technologies and newest construction technologies.
Pajkert, Anna Ewa [Verfasser]. "Behavioural and Structural Adaptation to Hippocampal Dysfunction in Humans / Anna Ewa Pajkert." Berlin : Humboldt-Universität zu Berlin, 2020. http://d-nb.info/1217249877/34.
Full textUgail, Hassan. "Parametric design and optimisation of thin-walled structures for food packaging." Springer, 2003. http://hdl.handle.net/10454/2647.
Full textGstach, Dieter. "Comparing Structural Efficiency of Unbalanced Subsamples: A Resampling Adaptation of Data Envelopment Analysis." Inst. für Volkswirtschaftstheorie und -politik, WU Vienna University of Economics and Business, 1993. http://epub.wu.ac.at/6299/1/WP_24.pdf.
Full textSeries: Department of Economics Working Paper Series
Li, Wei. "Nonlinear effects in ground motion simulations: modeling variability, parametric uncertainty and implications in structural performance predictions." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34658.
Full textLaughlin, Trevor William. "A parametric and physics-based approach to structural weight estimation of the hybrid wing body aircraft." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45829.
Full textMoschetti, Lorenzo. "Parametric Sensitivity Study of Shear-Flexure Interaction Modeling for Reinforced Concrete Structural Walls under Cyclic Loading." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Find full textMiller, Robert. "Approaches to the parametric modeling of hormone concentrations." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-118882.
Full textReglin, Bettina, Timothy W. Secomb, and Axel R. Pries. "Structural Control of Microvessel Diameters: Origins of Metabolic Signals." FRONTIERS MEDIA SA, 2017. http://hdl.handle.net/10150/626059.
Full textWebster, Duncan James. "A combined experimental and computational model for genetic control of micro structural bone adaptation /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17851.
Full textNaderan-Tahan, Khosro. "Stress analysis of spherical shells with one and/or two neighbouring nozzles using internal pressure and external loadings by finite element method : a parametric survey." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242464.
Full textClark, Michele Candice. "Structural-functional aspects of caring for elders in the home environment." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184912.
Full textDing, Jie. "Structural and fluid analysis for large scale PEPA models, with applications to content adaptation systems." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/7975.
Full textMerland, Romain. "Génération de grilles de type volumes finis : adaptation à un modèle structural, pétrophysique et dynamique." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0037/document.
Full textVoronoi grids are generated under constraints to reduce the errors due to cells geometry during flow simulation in reservoirs. The Voronoi points are optimized by minimizing objective functions relevant to various geometrical constraints. An original feature of this approach is to combine simultaneously the constraints: - Cell quality, by placing the Voronoi points at the cell barycenters. - Local refinement according to a density field rho, relevant to permeability, velocity or vorticity. - Cell anisotropy according to a matrix field M built with the three principal vectors of the anisotropy, which one is defined by the velocity vector or by the stratigraphic gradient. - Faces orientation according to a matrix field M built with the three vectors orthogonal to the faces, which one is defined by the velocity vector. - Conformity to structural features, faults and horizons. - Voronoï points alignment along well path. The quality of the generated grids is assessed from geometrical criteria and from comparisons of flow simulation results with reference fine grids. Results show geometrical improvements, that are not necessarily followed by flow simulation results improvements
Sternchüss, Arnaud. "Multi-level parametric reduced models of rotating bladed disk assemblies." Phd thesis, Ecole Centrale Paris, 2009. http://tel.archives-ouvertes.fr/tel-00366252.
Full textEl, Mendili Mohamed-Mounir. "Analysis of the structural integrity of the spinal cord in motor neuron diseases using a multi-parametric MRI approach." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066575/document.
Full textDegenerative motor neuron diseases (MND) are characterized by a progressive dysfunction and loss of ventral horn motor neurons of the spinal grey matter. Beyond this common anatomical susceptibility, which is responsible for a progressive and diffuse weakness, other neurological systems are also impaired. The corticospinal tract (CST) degeneration is a classical feature of amyotrophic lateral sclerosis (ALS), which is the most common adult onset motor neuron disease, but a more widespread multisystem involvement is now well recognized. In particular, early sensory system involvement has been demonstrated in animal models of ALS and also of survival motor neuron 1 gene linked spinal muscular atrophy (SMN1-linked SMA). In human patients, magnetic resonance imaging (MRI) has emerged as the most powerful approach at the brain level to extract quantitative data on neuronal loss, axonal degeneration and demyelination in degenerative conditions. Studies at the spinal cord levels are scarce mainly because of technical and methodological difficulties. The objective of the present thesis project was to use a multi-parametric MRI approach at the spinal cord level to analyze grey and white matter structures that are impaired in two most common MND, i.e. ALS and SMN1-linked SMA, their temporal alterations during the disease course and the functional correlates, as assessed by clinical and electrophysiological examinations
Lee, Karla Chui Luan. "Structural adaptation of the mouse ulna to mechanical loading and the involvement of estrogen receptor α." Thesis, Royal Veterinary College (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401718.
Full textGates, Michael S. "Devaluing Stigma in the Context of Forgiveness, Coping and Adaptation: a Structural Regression Model of Reappraisal." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc115083/.
Full textHaQuang, Ninh. "The response of multidegree-of-freedom systems with quadratic and cubic nonlinearities subjected to parametric and external excitations." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49787.
Full textKarlsson, Susanne. "Terminology in the Translation of TwoTexts on Structural Engineering." Thesis, Linnéuniversitetet, Institutionen för språk och litteratur, SOL, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-13519.
Full text