Dissertations / Theses on the topic 'Structure and dynamic'
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Large, Edward Wilson. "Dynamic representation of musical structure." Connect to resource, 1994. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osub42551808.
Advisor: J.B. Pollack, Dept. of Computer and Information Sciences. Includes bibliographical references (leaves 197-208). Available online via OhioLINK's ETD Center.
Chiba, Ayano. "Dynamic structure of liquid chalcogens." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/148354.
Sribalaskandarajah, Kandiah. "A computational framework for dynamic soil-structure interaction analysis /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/10180.
MENICHINI, AMILCAR ARMANDO. "Financial Frictions and Capital Structure Choice: A Structural Dynamic Estimation." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/145397.
Tee, Chee Heong. "Dynamic response of plates and buried structures." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3803.
Title from document title page. Document formatted into pages; contains xi, 87 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 76-78).
Miró, Ramírez Pere. "Giant polyoxometalates : dynamic structure and reactivity." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/9104.
In this thesis different methods were used to study several systems in which giant polyoxometalates are involved. The validity of the theoretical methods applied and the results obtained were always contrasted with the experimental evidence provided by the groups of Prof. Achim Müller (Bielefeld) and Prof. Marcella Bonchio (Padova). In certain cases the theoretical results provided an explanation for experimental observations and in other cases they had allowed prediction as main objective.
Chapter IV presents the results regarding encapsulated water molecules inside the giant polyoxometalate cavities. Chapter V presents the results of the studies about ion pairing on polyoxometalates. Chapters VI and VII presents the results of two different polyoxometalates and their catalytic activity. Finally Chapter VIII presents a theoretical study on the effect of counterions on the growth of giant uranium polyperoxometalates.
Polioxometal·lats Gegants: Estructura Dinàmica i Reactivitat.
En la present tesi diferents mètodes han estat utilitzats per estudiar diversos sistemes on els polyoxometalats gegants juguen un paper fonamental. La validesa dels mètodes computacionals utilitzats i dels resultats obtinguts han estat sempre contrastats amb les evidencies experimentals facilitades pels grups del Prof. Achim Müller (Bielefeld) i Prof. Marcella Bonchio (Padova). En alguns casos els resultats computacionals han permès explicar les observacions experimentals i en d'altres han permet fer prediccions com a principal objectiu.
En el capítol IV es presenten els resultats referents a l'estructura de l'aigua encapsulada en les cavitats presents a polioxometal·lats gegants. El capítol V presenta els resultats dels estudis sobre ion pairing en polioxometal·lats. Els capítols VI i VII presenten els resultats de dos sistemes diferents i la seva activitat com a catalitzadors. Finalment, el capítol VIII presenta un estudi teòric sobre l'efecte dels contraions en el creixement de poliperoxometal·lats gegants d'urani.
Stewart, John Charles. "Phosphatetrylenes : Synthesis, Structure and Dynamic Behaviour." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506502.
Jones, Christopher Andrew. "Crowd-structure dynamic interaction in stadia." Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543299.
Håkansson, Andreas. "Structure dynamic study of noise encapsulations." Thesis, KTH, Farkost och flyg, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-143504.
Agre, Philip. "The dynamic structure of everyday life." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14422.
Lee, Eunjeong. "Structure and Dynamic Studies of Dpo4." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu160705211764847.
Pitsillis, Zachry Steven. "Estimating dynamic affine term structure models." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15731.
Jochi, Yasumasa. "Crystallographic Refinement of Protein Dynamic Structure." 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/150011.
Balendra, Surendran. "Numerical modeling of dynamic soil-pile-structure interaction." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Thesis/Fall2005/s%5Fbalendra%5F120705.pdf.
Yogendrakumar, Muthucumarasamy. "Dynamic soil-structure interaction : theory and verification." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29222.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
Aldaikh, Hesham S. H. "Discrete models for the study of dynamic structure-soil-structure interaction." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633205.
Melgar, Freire María Dolores. "Keplerates: from Electronic Structure to Dynamic Properties." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/349212.
Esta Tesis está centrada en el estudio de Kepleratos, una familia de polioxometalatos con simetría icosaédrica. Los polioxometalatos son clusters inorgánicos anionicos compuestos por unidades MOn, donde M es un metal de transición normalmente en su estado de oxidación más alto (Mo(VI), W(VI), V(V)...). Por un lado, la estructura electrónica de los Kepleratos se ha estudiado desde un punto de vista de la Teoría del Funcional Densidad (DFT). Además, se ha analizado la interacción entre la cápsula Mo132 y sus correspondientes ligandos internos. Por otro lado, en colaboración con otros grupos, tanto experimental como teórico, se propone un mecanismo de formación de la cápsula Mo132 a partir de los datos obtenidos mediante espectroscopía Raman. Parte de la información obtenida mediante DFT se ha utilizado para obtener los parámetros necesarios para realizar una serie de simulaciones de Dinámica Molecular con el fin de estudiar el comportamiento del macro-ión Mo132 en solución acuosa en presencia de diferentes cationes (centrándose en la importancia de la hidrofobicidad del catión), así como los efectos de la temperatura en dicho comportamiento.
This Thesis is aimed at the study of a family of icosahedral symmetry polyoxometalates: the so-called Keplerates. Polyoxometalates are inorganic anionic clustters composed of MOn units, where M represents a transition metal atom usually at its highest state of oxidation Mo(VI), W(VI), V(V)...). On one hand, the electronic structure of Keplerates is studied from a Density Functional Theorey (DFT) point of view. Furthermore, the interaction between the Mo132 capsule and its inner ligands has been analyzed. On the other hand, in collaboration with both experimental and theoretical groups, a formation mechanism for the Mo132 capsule is proposed, based on Raman espectroscopy data. Part of the information achieved by DFT has been used to obtain the parameters required in order to perform Molcular Dynamics simulations regarding the behaviour of the Mo132 macro-ion in aqueous solution in the presence of different cations (focusing on the relevance of the hydrophobic character of teh cation), as well as the effects that temperature has on the system.
Yeh, Bryant P. 1970. "Kinetic wall : an exploration into dynamic structure." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9825.
Includes bibliographical references (p. 36-37).
The existence and survival of an organism in any given environment is the ability to adapt and change to that environment. Living entities are far more adaptable to a changing environment than anything produced by human design. Buildings exist at a very low level of sophistication when compared to any living organism. Living organisms are able to adapt to a changing environment with the aid of many specialized systems working in conjunction; circulatory system, nervous system, structure system and means of motion. For a building to exhibit this kind of sophistication, the integration and design of such active systems must be investigated. With new advances in the engineering of smart materials, computational control mechanisms, and robotics, this is potentially feasible. My research focuses on the development of one part of such a system; a computer controlled kinetic surface structure or kinetic wall. This system can be adapted to work as an sculptural internal space divider, a facade for an existing building, or a large scale dynamic roof system. The current prototype precedes the development of a fully integrated sensory feedback system, which when added could potentially be a first step towards a truly active building.
by Bryant P. Yeh.
S.M.
Seo, Youngmi. "Structure and Dynamic Properties of Interfacially Modified Block Copolymers from Molecular Dynamics Simulations." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492628195548591.
Jin, Meilan. "Signal Structure for a Class of Nonlinear Dynamic Systems." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6829.
VIANA, EDUARDO ARREGUY. "STRUCTURE-SOIL INTERACTION BY FRAME STRUCTURES UNDER DYNAMIC LOADS DUE TO RECIPROCATING COMPRESSORS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21832@1.
Compressores de gás de grande porte são componentes fundamentais em plantas industriais de refino de petróleo, atuando principalmente como agentes fornecedores de energia mecânica aos processos químicos. Dentre os tipos de compressores, destacam-se os alternativos. Devido a exigências de processo químico e arranjo industrial, é comum a instalação desses equipamentos em estruturas aporticadas, fato que, associado às características do movimento de suas partes mecânicas, não raramente as cargas dinâmicas geradas provocam vibrações inadmissíveis. Neste trabalho é avaliado o comportamento dinâmico de um sistema formado por uma estrutura aporticada, por compressor alternativo, pela fundação em estacas e finalmente pelo próprio solo. O estudo paramétrico realizado se desenvolve a partir de uma análise de modelos simplificados massa-mola, de um modelo em elementos finitos e de medições de campo visando a estabelecer intervalos de valores dos parâmetros do solo local dentro dos quais se identifique as características da resposta dinâmica do sistema. São avaliados os parâmetros coeficiente de mola (km) e a constante do coeficiente de reação horizontal (nh) do solo natural típico da área abrangida pela refinaria REPAR, localizada no município de Araucária, no estado do Paraná, solo esse pertencente à formação geológica denominada Guabirotuba. A avaliação do comportamento dinâmico do sistema através dos modelos desenvolvidos é balizada por valores de medição na estrutura real de velocidades de vibração efetivas, obtidas por instrumentação. Os parâmetros do solo são obtidos por retroanálise de resultados de ensaio de campo, utilizando-se dois modelos amplamente utilizados nos escritórios de projeto: modelo proposto por Miche (1932) e modelo proposto por Hetenyi (1946). O primeiro considera que os parâmetros do solo variam com a profundidade, e o segundo os considera constante com a profundidade. Busca-se avaliar também a influência de parâmetros do solo obtidos através de ensaios de carregamento estático (ABNT NBR 12131, 2006) e obtidos através de ensaios de carregamento estático cíclico, este último se propondo a simular o efeito dinâmico sobre o solo. Finalmente, compara-se os resultados fornecidos pelos modelos simplificados e pelo modelo em elementos finitos em termos das freqüências naturais de vibração.
Gas compressors are key components of industrial plants in oil refining, mainly acting as mechanical energy suppliers to chemical processes. Among the types of compressors, the reciprocating ones is highlighted. Due to mandatory demands of chemical process and industrial arrangement, it is common to install such equipment in framed structures. This condition and the typical movement of mechanical parts of the compressors generate dynamic loads which frequently causes unacceptable vibrations. The aim of the present work is to evaluate the dynamic behavior of a system consisting of a framed structure, a reciprocating compressor, foundation in piles and the soil itself. For this purpose, parametric study is developed from simplified spring-mass models, a finite element model and field measurements. The parametric study is aimed at establish ranges of local soil parameters within which the dynamic behavior of a system can be understood and measured. The parameters so-called spring stiffness (km) and the constant coefficient of horizontal reaction (nh) of natural soil which typically occurs in the area covered by the REPAR refinery, located in Araucaria, Paraná, are then evaluated. This type of natural soils belongs to the geological formation called Guabirotuba. The evaluation of the dynamic behavior of the system through the developed models is benchmarked by field measurements of effective velocity of vibration in the actual structure, obtained by instrumentation. The soil parameters are obtained by back analysis of tests results by using two models widely used in design offices: model proposed by Miche (1932) and model proposed by Hetenyi (1946). The first one takes in account the variation of the soil parameters with depth, and the second one considers soil parameters constant with depth. The aim is also to evaluate the influence of the soil parameters obtained by static and cyclic horizontal loading tests, the latter being proposed to simulate the dynamic effect on the soil. Finally, it is done comparisons of the results provided by simplified models and the finite element model in terms of natural frequencies of vibration.
To, W. T. P. "Dynamic response of footings and piles." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355915.
Shi, Yongjiu. "Dynamic behaviour of guyed tower platforms." Thesis, Heriot-Watt University, 1989. http://hdl.handle.net/10399/958.
Rubio, Jose E. "Modal Characterization and Structural Dynamic Response of a Crane Fly Forewing." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1941.
Södergren, Jones, and Anton Barraza. "Dynamic Assessment of Footbridges : A designer's method to estimate running induced vibrations." Thesis, KTH, Bro- och stålbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-229814.
Kendall, Peter K. "Numerical study of effects of fluid-structure interaction on dynamic responses of composite plates." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FKendall.pdf.
Thesis Advisor(s): Kwon, Young W. "September 2009." Description based on title screen as viewed on 6 November 2009. Author(s) subject terms: Fluid-structure interaction, composite, carbon fiber composite, dynamic response, finite element. Includes bibliographical references (p. 95-96). Also available in print.
Nieto, ferro Alex. "Nonlinear Dynamic Soil-Structure Interaction in Earthquake Engineering." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2013. http://www.theses.fr/2013ECAP0006/document.
The present work addresses a computational methodology to solve dynamic problems coupling time and Laplace domain discretizations within a domain decomposition approach. In particular, the proposed methodology aims at meeting the industrial need of performing more accurate seismic risk assessments by accounting for three-dimensional dynamic soil-structure interaction (DSSI) in nonlinear analysis. Two subdomains are considered in this problem. On the one hand, the linear and unbounded domain of soil which is modelled by an impedance operator computed in the Laplace domain using a Boundary Element (BE) method; and, on the other hand, the superstructure which refers not only to the structure and its foundations but also to a region of soil that possibly exhibits nonlinear behaviour. The latter subdomain is formulated in the time domain and discretized using a Finite Element (FE) method. In this framework, the DSSI forces are expressed as a time convolution integral whose kernel is the inverse Laplace transform of the soil impedance matrix. In order to evaluate this convolution in the time domain by means of the soil impedance matrix (available in the Laplace domain), a Convolution Quadrature-based approach called the Hybrid Laplace-Time domain Approach (HLTA), is thus introduced. Its numerical stability when coupled to Newmark time integration schemes is subsequently investigated through several numerical examples of DSSI applications in linear and nonlinear analyses. The HLTA is finally tested on a more complex numerical model, closer to that of an industrial seismic application, and good results are obtained when compared to the reference solutions
Gandhi, Parichey. "Dynamic inference-based learning of Markov network structure." [Ames, Iowa : Iowa State University], 2007.
Joost, Katrin. "Formal ontology : the dynamic structure of Husserl's phenomenology." Thesis, Staffordshire University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413535.
AndÅ, Hiroshi. "Dynamic reconstruction and integration of 3D structure information." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12360.
Yunt, Mehmet 1975. "Nonsmooth dynamic optimization of systems with varying structure." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65284.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 357-365).
In this thesis, an open-loop numerical dynamic optimization method for a class of dynamic systems is developed. The structure of the governing equations of the systems under consideration change depending on the values of the states, parameters and the controls. Therefore, these systems are called systems with varying structure. Such systems occur frequently in the models of electric and hydraulic circuits, chemical processes, biological networks and machinery. As a result, the determination of parameters and controls resulting in the optimal performance of these systems has been an important research topic. Unlike dynamic optimization problems where the structure of the underlying system is constant, the dynamic optimization of systems with varying structure requires the determination of the optimal evolution of the system structure in time in addition to optimal parameters and controls. The underlying varying structure results in nonsmooth and discontinuous optimization problems. The nonsmooth single shooting method introduced in this thesis uses concepts from nonsmooth analysis and nonsmooth optimization to solve dynamic optimization problems involving systems with varying structure whose dynamics can be described by locally Lipschitz continuous ordinary or differential-algebraic equations. The method converts the infinitedimensional dynamic optimization problem into an nonlinear program by parameterizing the controls. Unlike the state of the art, the method does not enumerate possible structures explicitly in the optimization and it does not depend on the discretization of the dynamics. Instead, it uses a special integration algorithm to compute state trajectories and derivative information. As a result, the method produces more accurate solutions to problems where the underlying dynamics is highly nonlinear and/or stiff for less effort than the state of the art. The thesis develops substitutes for the gradient and the Jacobian of a function in case these quantities do not exist. These substitutes are set-valued maps and an elements of these maps need to be computed for optimization purposes. Differential equations are derived whose solutions furnish the necessary elements. These differential equations have discontinuities in time. A numerical method for their solution is proposed based on state event location algorithms that detects these discontinuities. Necessary conditions of optimality for nonlinear programs are derived using these substitutes and it is shown that nonsmooth optimization methods called bundle methods can be used to obtain solutions satisfying these necessary conditions. Case studies compare the method to the state of the art and investigate its complexity empirically.
by Mehmet Yunt.
Ph.D.
Diehl, Ernst-Walter. "Effects of feedback structure on dynamic decision making." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13151.
Boyd, Alistair Richard. "Fluid-structure interaction under fast transient dynamic events." Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/10835.
Nieto, Ferro Alex. "Nonlinear Dynamic Soil-Structure Interaction in Earthquake Engineering." Phd thesis, Ecole Centrale Paris, 2013. http://tel.archives-ouvertes.fr/tel-00944139.
Romanel, Celso 1952. "DYNAMIC SOIL-STRUCTURE INTERACTION IN A LAYERED MEDIUM." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276511.
Lund, Bruno Pereira. "Essays in macroeconomy and dynamic term-structure models." reponame:Repositório Institucional do FGV, 2009. http://hdl.handle.net/10438/6856.
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This thesis is composed of three articles with the subjects of macroeconomics and - nance. Each article corresponds to a chapter and is done in paper format. In the rst article, which was done with Axel Simonsen, we model and estimate a small open economy for the Canadian economy in a two country General Equilibrium (DSGE) framework. We show that it is important to account for the correlation between Domestic and Foreign shocks and for the Incomplete Pass-Through. In the second chapter-paper, which was done with Hedibert Freitas Lopes, we estimate a Regime-switching Macro-Finance model for the term-structure of interest rates to study the US post-World War II (WWII) joint behavior of macro-variables and the yield-curve. We show that our model tracks well the US NBER cycles, the addition of changes of regime are important to explain the Expectation Theory of the term structure, and macro-variables have increasing importance in recessions to explain the variability of the yield curve. We also present a novel sequential Monte-Carlo algorithm to learn about the parameters and the latent states of the Economy. In the third chapter, I present a Gaussian A ne Term Structure Model (ATSM) with latent jumps in order to address two questions: (1) what are the implications of incorporating jumps in an ATSM for Asian option pricing, in the particular case of the Brazilian DI Index (IDI) option, and (2) how jumps and options a ect the bond risk-premia dynamics. I show that jump risk-premia is negative in a scenario of decreasing interest rates (my sample period) and is important to explain the level of yields, and that gaussian models without jumps and with constant intensity jumps are good to price Asian options.
Repp, Felix. "Computational analysis of dynamic bone structure and processes." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17308.
Our skeleton is composed of a dynamic material that is capable of healing and of adapting to changing mechanical loads through structural remodeling. In this thesis the mechano-regulation of these dynamic processes are addressed using computer modeling and 3-dimensional imaging and image analysis. During bone healing an intricate pattern of different newly formed tissues around the fracture site evolves in time and is influenced by the mechanical loading. Using a computer model which is describing this temporal-spatial evolution of tissue types for the full time-course of healing, this evolution is compared to the documented evolution of an animal experiment. Different hypotheses were tested how the mechanical stimulation results in the formation of different tissues. While the comparison with the outcome of the animal experiments does not allow to falsify any of the hypotheses, it suggests a different design of future animal experiments. Bone remodeling is thought to be mechano-regulated by the dense network of osteocytes. These osteocytes are embedded in bone and are connected to each other via a network of narrow canaliculi. The 3-dimensional structure of the network was imaged using rhodamine staining and laser scanning confocal microscopy. Image analysis tools were developed to determine the network topology and to analyze its density and orientation. The analysis focused on osteons, the building blocks of cortical bone. Within an osteon we found a large variability of the network density with extensive regions without network. Most of the network is oriented radially towards the center of the osteon, i.e.\ parallel to the direction in which the bone material is deposited. The network perpendicular to this direction twists when moving along the direction of bone deposition. A correlation with the main orientation the fibrous constituent of bone, collagen, was detected. Furthermore indicates our data additional structural changes in the network alignment.
Vandin, Andrea. "Specification and analysis of systems with dynamic structure." Thesis, IMT Alti Studi Lucca, 2013. http://e-theses.imtlucca.it/89/1/Vandin_phdthesis.pdf.
Nagy, N. M. A. "Dynamic soil structure interaction of buried concrete structures under the effect of blast loads." Thesis, University of Bradford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534654.
Sander, Tavallaey Shiva. "Wave propagation in sandwich structure." Doctoral thesis, KTH, Vehicle Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.
Lind, Östlund Johan. "Dynamic soil-structure interaction of simply supported high-speed railway bridges." Licentiate thesis, KTH, Bro- och stålbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279651.
Forskning i syfte att utröna effekten av dynamisk jord–struktur-interaktion (SSI)på järnvägsbroar presenteras i denna avhandling med huvudfokus på fritt upplagdabroar med stöd av plattgrundlagda fundament i jordar på fast berggrund. Forsknin-gen syftar till att ge förståelse för interaktionen mellan jord och järnvägsbroar samtatt ge rekommendationer på hur systemet kan modelleras ur ett designperspektiv.En tredimensionell (3D) fritt upplagd jord–bromodell utvecklades först och effek-terna av modellantaganden gjorda på jord–grundläggningssystemet utvärderadesi en 3D miljö (artikel I). Jord–grundläggningssystemet förfinades och en studiegenomfördes för att utvärdera effekterna av modellantaganden på impedansfunk-tioner, inklusive påverkan av den permanenta belastningen som verkar på jord–grundläggningssystemet (artikel II). Slutligen utfördes en omfattande parametriskstudie av det sammansatta jord–brosystemet där en uppsättning tvådimensionella(2D) bromodeller kombinerades med en uppsättning jordar (artikel III). Ett kom-pletterande avsnitt relaterat till artikel III lades till i denna avhandling som visareffekterna av massan av underbyggnaden på jord–brosystemet.De modellantaganden som görs vid skapandet av jord–grundläggningsmodeller ochjord–bromodeller kan vara mycket viktiga och bör utföras med varsamhet. Den per-manenta belastningen som verkar på jord–grundläggningssystemet kan väsentligtförändra impedansfunktionerna. Massan av underbyggnaden kan vidare ändra re-sponsen i jord–brosystemet, beroende på dess storlek, och att försumma den kan gefelaktiga resultat. De 3D effekterna av SSI orsakar inte höga vibrationer på grundav andra moder än den första böjmoden, och att anta en 2D bromodell är såledesgenerellt sett motiverat.Effekterna av SSI på jord–brosystemet i grunda jordar beror till stor del av kvotenmellan brons naturliga frekvens och jordens fundamentala frekvens. Beroende påvärdet på denna kvot kan effekten av att inkludera SSI i bromodeller bidra till attbron får en försumbar, konservativ, eller icke-konservativ respons, i jämförelse medbron med antagandet om fasta upplag.
QC 20200903
Widmer-Cooper, Asaph. "Structure and dynamics in two-dimensional glass-forming alloys." Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1320.
Widmer-Cooper, Asaph. "Structure and dynamics in two-dimensional glass-forming alloys." Science. School of Chemistry, 2006. http://hdl.handle.net/2123/1320.
The glass-transition traverses continuously from liquid to solid behaviour, yet the role of structure in this large and gradual dynamic transition is poorly understood. This thesis presents a theoretical study of the relationship between structure and dynamics in two-dimensional glass-forming alloys, and provides new tools and real-space insight into the relationship at a microscopic level. The work is divided into two parts. Part I is concerned with the role of structure in the appearance of spatially heterogeneous dynamics in a supercooled glass-forming liquid. The isoconfigurational ensemble method is introduced as a general tool for analysing the effect that a configuration has on the subsequent particle motion, and the dynamic propensity is presented as the aspect of structural relaxation that can be directly related to microscopic variations in the structure. As the temperature is reduced, the spatial distribution of dynamic propensity becomes increasingly heterogeneous. This provides the first direct evidence that the development of spatially heterogeneous dynamics in a fragile glass-former is related to spatial variations in the structure. The individual particle motion also changes from Gaussian to non- Gaussian as the temperature is reduced, i.e. the configuration expresses its character more and more intermittently. The ability of several common measures of structure and a measure of structural ‘looseness’ to predict the spatial distribution of dynamic propensity are then tested. While the local coordination environment, local potential energy, and local free volume show some correlation with propensity, they are unable to predict its spatial variation. Simple coarse-graining does not help either. These results cast doubt on the microscopic basis of theories of the glass transition that are based purely on concepts of free volume or local potential energy. In sharp contrast, a dynamic measure of structural ‘looseness’ - an isoconfigurational single-particle Debye-Waller (DW) factor - is able to predict the spatial distribution of propensity in the supercooled liquid. This provides the first microscopic evidence for previous correlations found between short- and long-time dynamics in supercooled liquids. The spatial distribution of the DW factor changes rapidly in the supercooled liquid and suggests a picture of structural relaxation that is inconsistent with simple defect diffusion. Overall, the work presented in Part I provides a real-space description of the transition from structure-independent to structure-dependent dynamics, that is complementary to the configuration-space description provided by the energy landscape picture of the glass transition. In Part II, an investigation is presented into the effect of varying the interparticle potential on the phase behaviour of the binary soft-disc model. This represents a different approach to studying the role of structure in glass-formation, and suggests many interesting directions for future work. The structural and dynamic properties of six different systems are characterised, and some comparisons are made between them. A wide range of alloy-like structures are formed, including substitutionally ordered crystals, amorphous solids, and multiphase materials. Approximate phase diagrams show that glass-formation generally occurs between competing higher symmetry structures. This work identifies two new glass-forming systems with effective chemical ordering and substantially different short- and medium-range structure compared to the glassformer studied in Part I. These represent ideal candidates for extending the study presented in Part I. There also appears to be a close connection between quasicrystal and glass-formation in 2D via random-tiling like structures. This may help explain the experimental observation that quasicrystals sometimes vitrify on heating. The alignment of asymmetric unit cells is found to be the rate-limiting step in the crystal nucleation and growth of a substitutionally ordered crystal, and another system shows amorphous-crystal coexistence and appears highly stable to complete phase separation. The generality of these results and their implications for theoretical descriptions of the glass transition are also discussed.
Barakati, Adel. "Numerical Modelling of Liquid Containing Structure under Dynamic Loading." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33425.
Posse, Ernesto. "Modelling and simulation of dynamic-structure discrete-event systems." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22006.
La modélisation et la simulation à événements discrets constituent une approche bien établie pour la description et l'étude des systèmes dynamiques complexes. Ces dernières années, il y a eu un regain d'intérêt pour la modélisation des systèmes complexes à structure dynamique. Ces systèmes sont généralement plus difficiles à comprendre et à analyser que les systèmes ayant une structure statique. Cette analyse et cette compréhension peuvent être développées à l'aide de formalismes de modélisation fondés sur une base solide et des outils appropriés. Dans cette thèse, nous explorons une approche de modélisation et de simulation des systèmes à événements discrets fondée sur l'algèbre de processus. Ce document se compose de deux parties. Dans la première partie, nous étudions ce que l'on appelle le formalisme Discrete-EVent System Specifications (DEVS.) Nous développons un autre fondement théorique pour DEVS fondée sur la sémantique opérationnelle structurelle, en mettant l'accent sur les propriétés de déterminisme et de compositionalité. Dans la deuxième partie, nous développons un langage de modélisation pour systèmes à structure dynamique nommé kiltera, en nous fondant sur les algèbres de processus et en incorporant des éléments de modélisation à événements discrets. Ce langage, en se fondant sur le \pi-calcul, nous permet de décrire et de raisonner sur les systèmes mobiles, distribués et au temps-réel, à événements discrets, dans un cadre conceptuel unique. Nous développons une base théorique fondée sur la sémantique opérationnelle structurelle et nous établissons des propriétés fondamentales concernant le déterminisme-temps, la continuité, la compositionalité et la légitimité. Nous construisons un simulateur pour le langage qui supporte à la fois l'exécution séquentielle et distribuée de modèles, en utilisant une variante de l'algorithme Time Warp. Enfin, nous appliquons ce la
Pheng, Sokhom. "Dynamic data structure analysis and visualization of Java programs." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98768.
Data structure usage has been the target of various static techniques. Static approaches, however, may suffer from reduced accuracy in complex situations and have the potential to be overly-conservative in their approximation. An accurate, clean picture of runtime heap activity is difficult to achieve.
We have designed and implemented a dynamic heap analysis system that allows one to examine and analyze how Java programs build and modify data structures. Using a complete execution trace from a profiled run of the program, we build an internal representation that mirrors the evolving runtime data structures. The resulting series of representations can then be analyzed and visualized. This gives us an accurate representation of the data structures created and an insight into the program's behaviour. Furthermore we show how to use our approach to help understand how programs use data structures, the precise effect of garbage collection, and to establish limits on static data structure analysis.
A deep understanding of dynamic data structures is particularly important for modern, object-oriented languages that make extensive use of heap-based data structures. These analysis results can be useful for an important group of applications such as parallelization, garbage collection optimization, program understanding or improvements to other optimization.
Seddon, Caroline Michelle. "Modelling transient dynamic fluid-structure interaction in aerospace applications." Thesis, University of Salford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492434.
Gandomzadeh, Ali. "Dynamic soil-structure interaction : effect of nonlinear soil behavior." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00648179.
Gysling, Daniel Lawrence. "Dynamic control of centrifugal compressor surge using tailored structure." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/41320.
GRSN 406712
Includes bibliographical references (leaves 122-123).
by Daniel Lawrence Gysling.
M.S.
Staker, Shawn W. "A dynamic term structure model of Central Bank policy." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53304.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 115-118).
This thesis investigates the implications of explicitly modeling the monetary policy of the Central Bank within a Dynamic Term Structure Model (DTSM). We follow Piazzesi (2005) and implement monetary policy by including the Fed target rate as a state variable. The discontinuous target dynamics are accurately modeled via a non-linear switching process, while still maintaining affine requirements under the pricing measure ensuring tractability. To ensure a flexible risk specification we turn to the parametrization of Cheridito et al (2007), with extensions to the target jump process. Model parameters are estimated via a simulated maximum likelihood estimation scheme with importance sampling. A Bayesian particle filter is used as a robustness check, and it's use for static parameter estimation in a DTSM framework is explored. Our results support those in Piazzesi (2005), revealing a substantial improvement in pricing errors especially on the short end of the yield curve. The model construction provides a natural framework to inspect monetary policy information embedded in yields, which is found to be substantial. We find the addition of the target rate greatly improves the model's ability to explain excess return. An ability which is increased with the inclusion of the full term structure of target rates, as measured from Fed future contracts. We postulate the improved performance is due to the target as a proxy for short term rates, and a conduit to express the information content of the term structure of target rates.
by Shawn W. Staker.
Ph.D.