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1
Fay, Noah Patrick. "Kinematics and dynamics of the Pacific-North American plate boundary in the western United States /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1280144291&sid=2&Fmt=2&clientId=11238&RQT=309&VName=PQD.
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Thesis (Ph. D.)--University of Oregon, 2006.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 118-140). Also available for download via the World Wide Web; free to University of Oregon users.
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Valdés, Julio R. "Simultaneous determination of frequency dependent modulus and damping from resonant column tests." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20169.
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Hapa, Cankat. "Uncertainty In Well Test And Core Permeability Analysis." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610144/index.pdf.
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Reservoir permeability is one of the important parameters derived from well test analysis. Small-scale permeability measurements in wells are usually made using core plugs, or more recently, probe permeameter measurements. Upscaling of these measurements for comparisons with permeability derived well tests (Pressure Build-Up) can be completed by statistical averaging methods. Well Test permeability is often compared with one of the core plug averages: arithmetic, geometric and harmonic. A question that often arises is which average does the well test-derived permeability represent and over what region is this average valid? A second important question is how should the data sets be reconciled when there are discrepancies?
In practice, the permeability derived from well tests is often assumed to be equivalent to the arithmetic (in a layered reservoir) or geometric (in a randomly distributed permeability field) average of the plug measures. These averages are known to be members of a more general power-average solution. This pragmatic approach (which may include an assumption on the near-well geology) is often flawed due to a number of reasons, which is tried to be explained in this study. The assessment of in-situ, reservoir permeability requires an understanding of both core (plug and probe) and well test measurements –
in terms of their volume scale of investigation, measurement mechanism, interpretation and integration. Pressure build-up tests for 26 wells and core plug analysis for 32 wells have valid measured data to be evaluated. Core plug permeabilities are upscaled and compared with pressure build-up test derived permeabilities. The arithmetic, harmonic and geometric averages of core plug permeability data are found out for each facies and formation distribution. The reservoir permeability heterogeneities are evaluated in each step of upscaling procedure by computing coefficient of variation, The Dykstra-Parson&
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s Coefficient and Lorenz Coefficients. This study compared core and well test measurements in South East of Turkey heavy oil carbonate field. An evaluation of well test data and associated core plug data sets from a single field will be resulting from the interpretation of small (core) and reservoir (well test) scale permeability data. The techniques that were used are traditional volume averaging/homogenization methods with the contribution of determining permeability heterogeneities of facies at each step of upscaling procedure and manipulating the data which is not proper to be averaged (approximately normally distributed) with the combination of Lorenz Plot to identify the flowing intervals. As a result, geometrical average of upscaled core plug permeability data is found to be approximately equal to the well test derived permeability for the goodly interpreted well tests. Carbonates are very heterogeneous and this exercise will also be instructive in understanding the heterogeneity for the guidance of reservoir models in such a system.
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Yucel, Kivanc. "3d Modeling Of Salt Related Structures In The Friesland Platform, The Netherlands." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612240/index.pdf.
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Southern North Sea Basin is one of the mature hydrocarbon basins in NW Europe and is shaped by a number of phases of tectonic deformations during the Phanerozoic. In addition, mobilization and halokinesis of thick Permian Zechstein Salt has enhanced and contributed to the deformation of the region since Triassic, which further complicated the geology of the region. The Friesland Platform, which is a stable platform area located in northern Netherlands, experienced the main deformation phases that Europe has been endured together with the deformation of Permian Zechstein salt.
In this study a computer based 3D modeling has been carried out within the Friesland Platform with the use of 3D seismic and borehole data in order to delineate structural elements and geological development of the area with special emphasis on the salt tectonic deformation.
The model was constructed by picking key horizons and major faults from the seismic sections in time domain and then migrated into depth domain. The stratigraphy of the
area is correlated with horizons by well-seismic matching. The model includes major structures and seismostratigraphic units of Permian to recent, revealing salt and salt induced structures formed during the periods of active salt movements. Thick Zechstein salt layers deposited in N-S-oriented grabens and half grabens of South Permian Basin acted as the primary control for the location of salt diapirs and are reflected on the overburden without a direct continuation (unlinked) of the basement faults into the overburden. The mapped N-S oriented salt-cored anticline and a convergent conjugate transfer zone between a pair of segmented normal growth faults at the crest of the anticline are controlled by the ascent of the Zechstein salt.
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Ulgen, Deniz. "An Experimental Study On The Behavior Of Box-shaped Culverts Buried In Sand Under Dynamic Excitations." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613706/index.pdf.
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Seismic safety of underground structures (culvert, subway, natural gas and water sewage systems) plays a major role in sustainable public safety and urban development. Very few experimental data are currently available and there is not generally accepted procedure to estimate the dynamic pressures acting on underground structures. This study aims to enhance the state of prevalent information necessary in understanding the dynamic behavior of box culverts and the stresses acting under dynamic excitations through experimental analyses. For this purpose, a series of shaking table tests were conducted on box-type culverts buried in dry sand. To simulate the free-field boundary conditions, a laminar box was designed and manufactured for use in a 1-g shake table. Four culvert models having different rigidities were tested under various harmonic motions in order to examine the effect of flexibility ratio on dynamic lateral soil pressures. Based on the tests results, a simplified dynamic pressure distribution acting on sidewalls of the culvert model was suggested. Then, a dynamic lateral coefficient was defined for the proposed peak pressure value in the distribution. The values of this coefficient were obtained as a function of shear strain and relative stiffness between the soil and underground structure. Finally, a simplified frame analysis approach was suggested for the assessment of the forces on the structure, to help to carry out a preliminary design of box-type culverts. In this approach, it was assumed that the culvert was fixed at bottom and subjected to lateral stresses on sidewalls and shear stresses on the upper face. For the confirmation of the method, centrifuge tests were conducted on a box-type culvert model under the Seventh Framework Programme of European Union with Grant Agreement No.227887. Results show that the proposed simplified procedure can be used in reasonable accuracy as a practical approach for the preliminary assessment of box-type culverts buried in dry sand under seismic action.
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Trouw, F. R. "The structure and dynamics of graphite intercalation compounds." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371585.
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Soares, Ana Paula. "Variabilidade espacial no Sistema Aquífero Guarani : controles estratigráficos e estruturais." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/15279.
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A funcionalidade de um sistema aqüífero é dependente dos atributos do reservatório, em especial as suas heterogeneidades, associadas às propriedades intrínsecas da rocha e descontinuidades relacionadas à compartimentação estrutural. O presente estudo teve como objetivo principal identificar e mapear a organização espacial dos componentes estratigráficos e compartimentos estruturais do Sistema Aqüífero Guarani, localizado na bacia do Paraná, a fim de verificar os efeitos na sua distribuição na organização e funci- onalidade. Foram observadas as variações na salinidade, as zonas de recarga e de des- carga, visando contribuir para os estudos que estabelecem prioridades de uso, mapea- mento, monitoramento e redução das atividades potencialmente contaminantes. A extensa seção siliciclástica do aqüífero foi formada por sistemas deposicionais eólicos e fluviais, de idade triássica e jurássica, englobados principalmente pelas forma- ções Pirambóia e Botucatu (Brasil), Misiones (Paraguai e Argentina) e Taquarembó (Uruguai). Levantamentos de seções estratigráficas ao longo da faixa de afloramentos e análise e interpretação de perfis geofísicos de poços para petróleo na bacia permitiram compor um novo quadro estratigráfico para o sistema aqüífero. A compartimentação estrutural do aqüífero foi definida a partir da integração de mapas morfoestruturais previamente publicados, traçados por interpretação de imagens de radar, satelitárias, modelos digitais de elevação e mapas regionais aeromagnetométri- cos e gravimétricos. Um novo mapa de lineamentos estruturais, interpretado a partir de um modelo digital de terreno, teve a precisão avaliada por comparação com mapas pré- vios gerados por diferentes autores e métodos. A sucessão sedimentar que compõe o aqüífero é objeto de diferentes correlações e classificações estratigráficas, com implicações na organização das unidades hidroestrati- gráficas. Caracteriza-se por associações de fácies cujos elementos arquiteturais e geo- metria permitem subdividí-lo em unidades de fluxo. Três unidades de fluxo principais foram reconhecidas, identificadas e denominadas conforme a fácies genética: duna (DU), interdunas (ID) e canais (CH). Secundariamente, duas outras unidades: crevasse (CR), lacustre e planície de inundação (FF) ambém foram identificadas. Estas unidades apresentam diferentes condutividade hidráulica e desempenham, conseqüentemente, papéis diferentes no funcionamento do aqüífero. Para as unidades de fluxo foi possível estimar a condutividade hidráulica média com base na seleção e tamanho médio dos grãos e na argilosidade dos sedimentos. Em termos de litoestratigrafia, o SAG é composto pelas formações Santa Maria, de ocorrência restrita ao Rio Grande do Sul, espacialmente sotoposta e justaposta às forma- ções flúvio-eólicas Guará (No oeste do Rio Grande do sul) e Pirambóia (leste do Rio Grande do Sul, e toda a parte central e norte da Bacia do Paraná). Todas estão extensa- mente superpostas, ora discordantemente, ora transicionalmente, pela Formação Botu- catu, caracterizada por depósitos dunares de desertos super-áridos. Tal fácies apresenta grande homogeneidade, boa porosidade e permeabilidade efetiva, caracterizando-se como a mais importante unidade hidroestratigráfica. Na interpolação dos contornos estruturais e espessuras das rochas do aqüífero, os lineamentos reconhecidos revelaram grandes blocos tectônicos que restringem o fluxo e a formação de células hidrogeológicas. A anisotropia sedimentar e a compartimentação estrutural foram consideradas na avaliação das unidades de fluxo e do sistema e no cál- culo do fluxo potencial dinâmico. Mapas de fluxo potencial e de direção de fluxo perm- tem visualizar a forte influência estrutural nas áreas preferenciais de recarga e descarga e os controles das entradas e saídas do sistema. A distribuição espacial das unidades mostra o zoneamento dos valores de condutividade hidráulica, com efeito direto na qua- lidade e na condutividade do fluxo da água dentro do aqüífero regional. Como resultado, conclui-se que apesar de se constituir um reservatório idealmente contínuo, a compartimentação e diferenciação interna do Sistema Aqüífero Guarani apon- tam para uma complexidade que parece ultrapassar a concepção de um sistema único.The functionality of an aquifer system depends on attributes of the reservoir, spe- cially those heterogeneities associated to intrinsic properties of the rock and to structural compartmentation discontinuities. The main objective of the study was to identify and to map the stratigraphic components and structural compartments of the Guarani Aquifer System, located in the Paraná Basin, to verify the effect of their distribution on the aquifer organization and functionality. Variations in the salinity, the discharge and recharge zones were also studied as a contribution to the studies that aim to establish priorities in the use, mapping, monitoring and in the reduction of potentially contami- nant activities. The extensive siliciclastic section, with a maximum thickness of 600 m, was formed by aeolian and fluvial depositional systems of Triassic and Jurassic age and referred to mainly as the Pirambóia and Botucatu (Brazil), Misiones (Paraguay and Argentina) and Taquarembó (Uruguay) formations. Survey of stratigraphic sections throughout the out- crop belt and analysis and interpretation of geophysical profiles of wells drilled for oil in the basin had allowed a new stratigraphic and structural picture of the water-bearing system to be drawn. The structural compartmentation of the aquifer was defined based on the integration of morphostructural maps previously published, traced from interpretation of radar and satellite images, digital terrain models of rise and aeromagnetometric and gravimetric regional maps. A new map of structural lineaments, interpreted from a digital elevation model, had its precision and accuracy evaluated by comparint it to previous maps gener- ated by different authors and methods. The sedimentary succession that form the water-bearing unit is object of different correlations and stratigraphic classifications with implications in the spatial configura- tion and regional connectivity of the hydrostratigraphic units. The succession is charac- terized by associations of facies whose architectural elements and geometry allow it to be subdivided in units of flow. Three main units of flow were recognized, identified and referred to as genetic facies: dune (DU), interdune (ID) and canals (CH). Secondarily, two other units: flooding plain crevasse (CR), lacustrine and (FF) were identified. These units show different hydraulic conductivities and play, consequently, different roles in the functioning of the aquifer. For the units of flow, it was possible estimate the average hydraulic conductivity on the basis of the selection and average size of its grains and in the mud content of the sediments. In litostratigraphic terms, the Guarani Aquifer System is represented by the forma- tions Santa Maria, restricted to Rio Grande do Sul state, bellow and spatially justaposed to the fluvial-aeolian formations Guará (in western Rio Grande do Sul) and Pirambóia (eastern Rio Grande do Sul, and all the central and north parts of the Paraná Basin). All units are extensively superposed, in some places unconformably, in other places transi- tionally, by the Botucatu Formation, which is characterized by dune deposits of super- arid deserts. Such facies present a great homogeneity, a good porosity and permeability, being the most important hydrostratigraphic unit. In the interpolation of the structural contours and thicknesses of the rocks of the water-bearing unit, the recognized lineaments revealed large tectonic blocks that restrict the flow and the formation of hydrogeologic cells. The sedimentary anisotropy and the structural compartments have been considered in the evaluation of the units of flow and the system and in the calculation of the dynamic potential flow. The obtained potential flow and direction of flow maps allowed the strong structural influence in the preferen- tial areas of recharge and discharge and the controls of the inputs and outputs of the sys- tem to be identified. The spatial distribution of the units shows a hydraulic conductivity zoning with direct effect in the quality and the regional conductivity. As result, it can be concluded that although it consists of an ideally continuous reservoir, the compartmentation and the internal differentiation of the Guarani Aquifer System point to a complexity that seems to exceed the conception of a single system.
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McClay, K. R. "Structural geology and tectonics /." Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09SD/09sdm126.pdf.
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Kiani, Tayebeh. "Modeling for geospatial database : application to structural geology data : application to structural geology data." Paris 6, 2010. http://www.theses.fr/2010PA066057.
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L’objectif de cette étude est de créer un modèle de base de données dans un système d’information géographique afin d’archiver, analyser, présenter et de diffuser des données observées lors des analyses de géologie structurale. Le modèle de données est conçu pour atteindre quatre objectifs: établir un vocabulaire partagé par les spécialistes, modéliser les concepts de géologie structurale, produire des cartes dérivées des cartes géologiques d’Iran et fonctionner avec un logiciel de système d’information géographique. Un ensemble de classes conceptuelles est alors identifié pour représenter les concepts de base de la géologie structurale pour les objets contacts, plis, foliations, fractures (failles et joints), linéations et zones de cisaillement. Un modèle conceptuel unifié est construit pour chaque famille. Puis, le modèle logique de données, présenté en langage UML à l’aide de diagrammes de classes statiques, est développé. Les étapes dans l’élaboration du modèle de données incluent l’identification des classes, la création des diagrammes de classes, la déclaration des attributs et des associations. Les cartes géologiques d’Iran au 1:250 000 sont ici utilisées comme base de présentation d’un modèle conceptuel permettant l’unification et la préparation d’une légende unique d’un ensemble pilote de quatre cartes. Les résultats de l’étude fondent les principaux concepts et les structures des données pour représenter l’information spatiale en géologie structurale et fournissent un modèle pour créer une base de données permettant la gestion des données de géologie structurale avec un système d’information géographique
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Lisle, Richard John. "Techniques of quantitative structural geology." Thesis, University of Birmingham, 2007. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446367.
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Miller, John Frederick. "Structural geology of the Ohio Shale." Connect to resource, 1996. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1163610177.
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Harris, D. J. "Atomistic simulation of the structure and dynamics of grain boundaries in mantle forming minerals." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362193.
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White, Thomas West Steltenpohl Mark G. "Geology of the 1:24,000 Tallassee, Alabama, Quadrangle, and its implications for southern Appalachian tectonics." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Geology_and_Geography/Thesis/White_Thomas_41.pdf.
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Tozer, Craig Hampton. "The influence of inherited structures on the Cenozoic orogeny of the Kyrgyz Tien Shan /." view abstract or download file of text, 2004. http://wwwlib.umi.com/cr/uoregon/fullcit?p3147837.
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Thesis (Ph. D.)--University of Oregon, 2004.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 171-180). Also available for download via the World Wide Web; free to University of Oregon users.
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Tol, Serife. "Dynamic Modeling Of Structural Joints." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614368/index.pdf.
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Complex systems composed of many substructures include various structural joints connecting the substructures together. These mechanical connections play a significant role in predicting the dynamic characteristics of the assembled systems
accurately. Therefore, equivalent dynamic models of joints that consist of stiffness and damping elements should be developed and the joint parameters should be determined for an accurate vibration analysis. Since it is difficult to estimate joint
parameters accurately by using a pure analytical approach, it is a general practice to use experimental measurements to model joints connecting substructures. In this study an experimental identification method is suggested. In this approach the frequency response functions (FRFs) of substructures and the coupled structure are measured and FRF decoupling method is used to identify equivalent dynamic characteristics of bolted joints. Since rotational degrees of freedom (RDOF) in connection dynamics is very important, a structural joint is modeled with translational, rotational and cross-coupling stiffness and damping terms. FRF synthesis and finite-difference formulations are used for the estimation of unmeasured FRFs and RDOF related FRFs, respectively. The validity and application of the proposed method are demonstrated both numerically and experimentally. In simulation studies, simulated experimental values are used, and it is seen that the identification results are prone to high errors due to noise in
measurement and the matrix inversions in the identification equations. In order to reduce the effect of noise, it is proposed to extract the joint properties by taking the average of the results obtained at several frequencies in the frequency regions
sensitive to joint parameters. Yet, it is observed in practical applications that experimental errors combine with the measurement noise and the identification results still may not be so accurate. In order to solve this problem, an update
algorithm is developed. In the approach proposed, the identified dynamic parameters are used as initial estimates and then optimum dynamic parameters representing the joint are obtained by using an optimization algorithm. The application of the proposed method is performed on a bolted assembly. It is shown with experimental studies that this method is very successful in identifying bolted joint parameters. The accuracy and applicability of the identification method suggested are illustrated by using a dynamically identified bolt in a new structure, and showing that the calculated FRFs in which identified joint parameters are used, match perfectly with
the measured ones for the new structure. In this study, the effects of bolt size and quality of bolts, as well as the bolt torque on the joint properties are also studied by making a series of experiments and identifying the joint parameters for each case.
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Jabboor, Wasseem. "Dynamic structural analysis of beams." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2469.
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The research reviews the various methods, accurate and approximate, analytical and numerical, used for the analysis of beams that are subjected to dynamic loads. A review of previous research is presented. A detailed description of one of the methods, the Simplified Elastic Plastic Method (the SEP Method), a well-developed approximate method, is given. A finite element model, built with the aid of the computer software ABAQUS, is described. Results of 20 experiments made by others are provided and used as a benchmark for the finite element analysis. The methodology used for the validation of the ABAQUS Model and the SEP Method is to do, for various study cases, a comparison between the experimental results, those computed using the ABAQUS Model and those predicted using the SEP Method. Having validated the ABAQUS Model, it has been used as a benchmark with which to check the SEP Method. Therefore, additional cases have been analysed using the ABAQUS Model in order to cover a more comprehensive range of variables. A good agreement has been found between the results. The accuracy of the ABAQUS model and the conservatism of the SEP Method are shown. A design procedure using the SEP Method has been developed. Calibration factors are also proposed in order to reduce the conservatism in the SEP Method. The results and recommendations of the research can be employed in the defence industry, civil and structural engineering.
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He, Jimin. "Identification of structural dynamic characteristics." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47105.
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Lievin-Lieven, Nicholas Andrew John. "Validation of structural dynamic models." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46413.
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Fonseca, Jose Manuel Rios. "Uncertainty in structural dynamic models." Thesis, Swansea University, 2005. https://cronfa.swan.ac.uk/Record/cronfa42563.
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Modelling of uncertainty increases trust in analysis tools by providing predictions with confidence levels, produces more robust designs, and reduces design cycle time/cost by reducing the amount of experimental verification and validation that is required. However, uncertainty-based methods are more complex and computationally expensive than their deterministic counterparts, the characterisation of uncertainties is a non-trivial task, and the industry feels comfortable with the traditional design methods. In this work the three most popular uncertainty propagation methods (Monte Carlo simulation, perturbation, and fuzzy) are extensively benchmarked in structural dynamics applications. The main focus of the benchmark is accuracy, simplicity, and scalability. Some general guidelines for choosing the adequate uncertainty propagation method for an application are given. Since direct measurement is often prohibitively costly or even impossible, a novel method to characterise uncertainty sources from indirect measurements is presented. This method can accurately estimate the probability distribution of uncertain parameters by maximising the likelihood of the measurements. The likelihood is estimated using efficient variations of the Monte Carlo simulation and perturbation methods, which shift the computational burden to the outside of the optimisation loop, achieving a substantial time-saving without compromising accuracy. The approach was verified experimentally in several applications with promising results. A novel probabilistic procedure for robust design is proposed. It is based on reweighting of the Monte Carlo samples to avoid the numerical inefficiencies of resampling for every candidate design. Although not globally convergent, the proposed method is able to quickly estimate with high accuracy the optimum design. The method is applied to a numerical example, and the obtained designs are verified with regular Monte Carlo. The main focus of this work was on structural dynamics, but care was taken to make the approach general enough to allow other kinds of structural and non- structural analyses.
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Tang, Lai-kwan Denise. "Geology of Tuen Mun Area, NW Hong Kong an updated model /." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B3829283X.
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Gleason, James Donald. "Paleozoic tectonics and sediment sources of the Ouachita fold belt, Arkansas-Oklahoma and West Texas: An isotopic and trace element geochemical study." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186844.
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Ordovician through Pennsylvanian strata of the Ouachita and Marathon sedimentary sequences show correlated Nd-Sr isotopic relations, Th/Sc ratios and REE patterns typical of evolved upper crustal sources, indicating that the 2000 km long Ouachita-Marathon fold belt consists primarily of recycled crustal materials. wi thin this sequence, Nd isotopes distinguish three distinct provenance groups: 1) Lower to Middle Ordovician hemipelagites and quartzose turbidites with ε(Nd)(t) = -13 to -16 (T(DM) = 1.8 to 2.1 Ga); 2) Upper Ordovician through Pennsylvanian hemipelagites and quartzolithic turbidites with ε(Nd)(t) = -6 to -10 (TOM = 1.4 to 1.7 Ga); 3) Mississippian tuffs with ε(Nd)(t) = -2 (TOM = 1.1 Ga). These data record a rapid Ordovician (ca. 450 Ma) shift in sedimentary sources within the off-shelf passive-margin sequence of deep-marine cherts and shales. Ouachita Silurian turbidites (ε(Nd) = -7 to -8) are isotopically identical to Middle Ordovician Taconic turbidites of the Sevier basin (Tellico Formation) in eastern Tennessee (ε(Nd) = -7 to -8), suggesting that Appalachian clastic wedges supplied Ouachita deep-sea turbidites beginning in the Late Ordovician. Pennsylvanian non-marine sandstones and shales from the Arkoma, Illinois, and Black Warrior basins have ε(Nd) = -7.5 to -10.0, similar to the thick (>10-12 km) Ouachita Carboniferous turbidite flysch sequence (ε(Nd) -7.5 to -9.6). The remarkable isotopic homogeneity of sediments delivered to the Ouachita-Appalachian region over this period implies extremely effective mixing and dispersal processes on a large (continent-wide) scale, consistent with a collisional belt provenance. A long-lived (ca. 150 Ma) tectonic link between the Appalachians and Ouachitas is thus implied by these data. Mississippian silicic ash-flow tuffs have trace-element and Nd isotopic compositions consistent with a continental-margin arc source. The active volcanic arc which erupted these tuffs apparently extended at least 1000 km from the Ouachita region to south of the Marathon region, but did not supply a significant component of the flysch. The data are consistent with submarine fan models of Ouachita flysch sedimentation demonstrating dominantly longitudinal transport down the axis of a Carboniferous remnant ocean basin from sources to the east. A model is proposed for the evolving Ouachita-Marathon suture between Laurentia and Gondwana, expanding upon Graham et a1. (1975), whereby dominantly Appalachian-derived seafloor detritus was swept up along the flanks of an approaching arc-trench system into sUbduction complexes and recycled incrementally along the length of the collision zone into the Marathon region.
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Paul, Jonathan David. "Dynamic topography and drainage of Africa and Madagascar." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708248.
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Pearson, Ofori. "Structural evolution of the central Nepal fold-thrust belt and regional tectonic and structural significance of the Ramgarh thrust." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/280143.
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Tectonic shortening within the Himalayan fold-thrust belt in Nepal has been accommodated by southward displacement of large thrust sheets. Most workers focus on the impact that the Main Central, Main Boundary, and Main Frontal thrusts have had on the orogen's structural, thermal, and geomorphic evolution. However, mapping across Nepal, has revealed the presence of the Ramgarh thrust, which is another orogen-scale thrust. The Ramgarh thrust, which had previously been recognized in India and far-western Nepal, occurs within Lesser Himalayan zone rocks, and accommodates a magnitude of shortening similar to that of the Main Central thrust. This dissertation focuses on the structural and tectonic significance of the Ramgarh thrust. Minor details notwithstanding, the structural characteristics of the Ramgarh thrust remain consistent along the ∼800 km width of the fold-thrust belt in Nepal. At current levels of erosion, the Ramgarh thrust is always exposed in a hanging-wall flat on footwall flat thrust relationship with other Lesser Himalayan zone rocks, and also with overlying rocks carried by the Main Central thrust. Mapping along a north-south transect in central Nepal has permitted the construction of a balanced cross-section, which shows that the fold-thrust belt has accommodated a minimum of 489 km of tectonic shortening. A large proportion of which was accommodated by slip on the Ramgarh thrust. Integrating structural constraints provided by mapping and the cross-section with existing thermochronologic, thermobarometric, and foreland basin provenance datasets yields a kinematic model for the structural evolution of the fold-thrust belt. Recognition of the structural relationship between the Ramgarh and Main Central thrusts also permits new insight into the nature of the Main Central thrust. Structural mapping combined with Nd isotope studies from the vicinity of the Ramgarh and Main Central thrusts in Langtang National Park suggest that the Main Central thrust can be defined as a relatively narrow tectonostratigraphic contact, and not as a broad, poorly defined, shear zone. Additionally, much of the volume of highly strained rocks in the footwall of the Main Central thrust may be genetically related to deformation on faults (including the Ramgarh thrust) that lie structurally below the Main Central thrust.
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Araiza, Garaygordobil Juan Carlos. "Dynamic assessment of structural building components." Doctoral thesis, Universitat Politècnica de Catalunya, 2003. http://hdl.handle.net/10803/6154.
Full textAbstract:
The development of methods that correlate the measure of dynamic parameters with the condition of the structure has received a considerable attention from the engineering community in the last few years. In the field of structural assessment of buildings, dynamic testing can be used to extend the inspection to every structural component, covering the gaps left by other more complex techniques (such as core extraction or load testing). The information obtained by the dynamic means is not restricted only (as traditional methods are) to the location in which the tests is developed while the use of a low number of sensors and simple excitation devices helps to reduce dramatically the cost of implementation.The general objective of the thesis consists on the demonstration of the usefulness of dynamic assessment on building components (such as masonry walls, stone piers or RC beams and slabs) using a simple-layout experiment but based intensively in numerical simulation.
The methodology to achieve the objective include tasks such as:
- The study the influence of different parameters on dynamic behavior of structures. This process -also known as parametrical study- recognizes the influence of the variables when performing a model updating.
- A series of laboratory campaigns to identify the influence of different structural damages on dynamic parameters. Studied damage-influence include: Stiffness deterioration by cracking on supported or suspended beams, carbonation of concrete, sulfate attack on concrete and rebars, chloride attack on concrete and axial load on masonry walls and piers.
- The application of a simple-layout method of dynamic assessment in real-life buildings. In some of those cases, static load test (direct identification method) is also developed to compare the reliability of the dynamic approach.
Experimental works and field studies carried out in this investigation have permitted to conclude that a combined implementation of a simple dynamic testing and numerical modeling is able to characterize the current structural conditions of a building component. The proposed dynamic assessment layout has conduced to the identification of characteristics such as boundary conditions, cracking levels, geometry properties or levels of axial loading. By comparing systematically the experimental and the numerical frequencies, it can also be concluded that a detailed model is able to predict the dynamic behavior of a building component. This prediction was accurate not only for undamaged conditions, but also for different damage scenarios. The present research has contributed to ascertain that dynamic testing is a valuable tool to assess the structural conditions of single concrete or masonry building elements such as concrete beams, RC or prestressed slabs, masonry walls or stone piers.
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Ji, Yunfeng. "Videogrammetric technique for structural dynamic applications /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20JI.
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Gopalakrishnamurthy, Sharath H. "Structural integrity inspection using dynamic responses /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p1418023.
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Li, Kuinian. "Impact dampers for structural dynamic control." Thesis, University of Bath, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409881.
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Alt, Eric Allen. "Structural modeling of dynamic polymer networks." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122711.
Full textAbstract:
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 2019Cataloged from PDF version of thesis.
Includes bibliographical references (pages 125-131).
Polymer network based gels are an important class of materials with a wide range of applications. Dynamic polymer networks, which crosslink via the formation of reversible bonds, in particular have great potential as stimuli responsive, mechanically tunable, and self-healing materials. Many important emergent properties of these materials, such as mechanical strength, are mediated by their underlying network structure, which can be characterized by the network topology and spatial distribution of nodes. Therefore, unlocking the full potential of these materials through rational design requires an understanding of how network structure arises as a function of network-forming precursor design. Because the bonds that crosslink dynamic polymer networks are reversible, stresses initially present or otherwise induced in these systems can be relieved through network rearrangement. As such, given sufficient time to relax, the network structure is determined by equilibrium thermodynamics.
This work presents a thermodynamic formalism which characterizes the free energy of a network in terms of node positional, network topological, and polymer conformational entropies. Through this lens, and aided by numerical calculations and simulations of model networks, we show how the free energy landscape with respect to density relates to factors which can be readily controlled through precursor design, such as polymer length and node size. Additionally, Monte Carlo simulations of explicit networks reveal that thermodynamic relaxation can give rise to spatial heterogeneity in the arrangement of network nodes. In the last chapter we use the tools developed in the earlier chapters to explore how these same design parameters influence the topological statistics of equilibrium networks. In addition to showing how internode connectivity increases with polymer length and system density, we find that inhomogeneity due to spatial relaxation can also lead to greater network connectivity.
Finally, we explore the weakening of network topologies due to substitution of polymer-linked node forming components with topologically non-functional counterparts, finding that larger nodes fare better than their smaller counterparts in maintaining network connectivity when these substitutions are made.
by Eric Allen Alt.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Chemistry
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Thompson, Stephen C. "Active tectonics in the central Tien Shan, Kyrgyz Republic /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/6744.
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Burgette, Reed Joel. "Uplift in response to tectonic convergence : the Kyrgyz Tien Shan and Cascadia subduction zone /." Connect to title online (ProQuest), 2008. http://proquest.umi.com/pqdweb?did=1616709721&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.
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Thesis (Ph. D.)--University of Oregon, 2008.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 225-242). Also available online in ProQuest, free to University of Oregon users.
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Rodriguez-Roa, Fernando Antonio. "Thrust belt architecture of the central and southern Western Foothills of Taiwan." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1523.
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Seiler, Christina. "Structural and thermal evolution of the Gulf Extensional Province in Baja California, Mexico : implications for Neogene rifting and opening of the Gulf of California /." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/4212.
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Henry, Heather Marie. "Investigation of a triangle zone structure between Augusta and Bowman's Corners, Lewis and Clark County, Montana." CONNECT TO THIS TITLE ONLINE, 2007. http://etd.lib.umt.edu/theses/available/etd-05212007-104742/.
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Elliot, Henry K. "Fractures in the region of the Rocky Hill anticline, Rocky Hill, Connecticut : a structural geological study /." View abstract, 2001. http://library.ccsu.edu/ccsu%5Ftheses/showit.php3?id=1644.
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Thesis (M.S.)--Central Connecticut State University, 2001.Thesis advisor: Charles W. Dimmick. " ... in partial fulfillment of the requirements for the degree of Master of Science in Physics and Earth Sciences." Includes bibliographical references (leaves 60-64). Also available via the World Wide Web.
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Al-Kotbah, Ahmed Mohammed Abdullah. "Structural geology of South Hadhramaut area Yemen Republic." Thesis, University of Glasgow, 1996. http://theses.gla.ac.uk/1460/.
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The northern margin of the Gulf of Aden has a long history of extension from the Cambrian to the present. The dominant structures are related to Oligo-Miocene rifting in the early stages of development of the Gulf of Aden and they overprint Palaeozoic and Mesozoic structures. An area of 170 km by 50 km was mapped at scale of 1:50,000. Landsat images of the whole area, at 1:50,000 and 1:100,000 and air photographs of part of the area were used as base maps. The resulting maps are the first detailed geological maps to be made for this area and are a major outcome of this research. Precambrian basement which was affected by the oldest stage of extension is overlain by a sedimentary cover sequence from upper Cretaceous through the Tertiary in age. The lower part of this sequence represents the Mesozoic post-rift succession deposited after the second period of extension recorded in this margin. Oligo-Miocene extension has resulted in a highly dissected rift shoulder in which the horizontal cover sequence at an elevation of 1500m to 2500m on the plateau is brought down in a series of tilted fault blocks to sea level at the Gulf coast. The massive, nodular Palaeocene limestone of the Umm er Radhuma Formation forms steep inaccessible fault scarps throughout the area. The faults vary in size from major ones which have strike lengths in excess of 50 km and throws over 1000 m to those that are too small to be recorded on the maps. By measuring the geometry of bedding in the rollover anticlines in the hanging walls of selected faults, the trajectories of the faults at depths were computed. These show that the major faults extend steeply down into metamorphic basement. Major faults with kilometric throws must lie off-shore or, less likely, are buried beneath the syn- and post-rift sediments of the coastal plain.
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Kazadi, Banza Samuel-Barry. "Structural geology of the Kinsevere Copper Deposit, DRC." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/24753.
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The Kinsevere mine is a copper deposit located in the Democratic Republic of Congo (DRC), within the Central African Copperbelt. This area is situated in the Katangan basin within the SE portion of the Lufilian Arc, which is a large, arcuate structure that extends from SE Angola, across the DRC, and into NW Zambia. The purpose of this study is to characterise the brittle deformation observed around the Kinsevere copper deposit to lead to an understanding of the deformation history of the area. This is accomplished by analysing fault-slip and fold data to help understand the relationship between regional palaeostress, faulting and folding present in the mine vicinity. This study also attempts to characterise fracture-controlled copper mineralisation within the interpreted geodynamic context of the area. The broader objective of this study is to relate the structural observations from Kinsevere to the deformation history of the Lufilian Arc. This study uses the right dihedral method to analyse four categories of brittle structures. The structural types analysed include slickensided faults, mineralised joints, and unmineralised joints and shear fractures. The data suggests that the palaeostress associated with the formation of brittle structures in the Kinsevere area occurred during three deformation events. The first event is characterised by a compressional stress regime which occurred during the early stage of the Kolwezian phase (D1). The second event is characterised by a strike-slip stress regime that formed as the result of clockwise rotation of the earlier (D1) compressional regime. Two fault-slip vectors were observed on the strike-slip fault planes, indicating that a reactivation occurred during the Monwezian phase (D2). The final structural event was characterised by the development of an extensional stress regime. This was associated with North-South oriented extension and is related to the East African Rift System (D3). These interpreted events correlate well with the geodynamic context related to the Lufilian orogeny. Another line of evidence that supports this structural interpretation is the presence of evaporitic minerals observed in the stratigraphic units surrounding the brecciated zones such as the RAT and the CMN. The structural association of these evaporitic minerals may be related to pre-existing, salt-bearing units, which were dissolved during an early compressive (D1) phase of the Lufilian orogeny. However, the contact between the Grey RAT and the Red RAT (distal from the breccia zones) does not show any evidence of faulting, and in the Kinsevere area the Grey RAT is always observed above the Red RAT. This suggests that the Grey RAT may be the uppermost stratigraphic unit of the RAT subgroup, which contradicts some previously published interpretations. Thus, the current structural architecture was probably formed from a combination of two separate mechanisms, including compression-related salt extrusion and the development of thrust faults and folding resulting from the shortening of the Katangan basin. Based on an analysis of the fracture-controlled mineralisation in the study area, it is shown here that most of the stress tensors indicate that these fractures were induced within the compressional stress regime generated by the Lufilian orogeny. This conclusion supports studies which suggest a multiphase origin for the mineralizing fluids active in the Katangan basin. Thus, the age of the copper mineralisation associated with fractures is interpreted to correlate with the timing of the folding event that occurred during the Lufilian orogeny between 540-550Ma.Dissertation (MSc)--University of Pretoria, 2012.
Geology
unrestricted
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King, Stephen Clive. "Structural studies in the Dingle Peninsula, Ireland." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280305.
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Bradway, Michael David. "Stratigraphy and structural geometry at the leading edge of the Montana Thrust Belt, east of Sun River Canyon, Lewis and Clark and Teton Counties, Montana." CONNECT TO THIS TITLE ONLINE, 2007. http://etd.lib.umt.edu/theses/available/etd-05072007-163806/.
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Brown, Hillary E. "Crustal rupture, creation, and subduction in the Gulf of California, Mexico and the role of gas hydrate in the submarine Storegga slide, offshore Norway." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1475164361&sid=10&Fmt=2&clientId=18949&RQT=309&VName=PQD.
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Van, Gestel Jean-Paul. "Structure and tectonics of the Puerto Rico-Virgin Islands platform and multi-confirguration ground penetrating radar data /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
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Johnson, Shannon D. "Structural geology of the Usakos Dome in the Damara Belt, Namibia." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50457.
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Thesis (MSc)--Stellenbosch University, 2005.ENGLISH ABSTRACT: The northeast-trending south Central Zone (sCZ) of the Pan-African Damara belt in central Namibia is structurally characterized by kilometer-scale, northeast-trending dome structures developed in Neoproterozoic rocks of the Damara Sequence. A number of different structural models have been proposed for the formation of these domes in the literature. This study describes the structural geology of the Usakos dome. The study discusses the structural evolution of the dome within the regional framework of the cSZ that represents the high-grade metamorphic axis of the Damara Belt, characterized by voluminous Pan-African granitoids. The northeastern part of the Usakos dome is developed as an upright- to northwestverging anticlinorium containing a steep southeasterly-dipping axial planar foliation. The northeast fold trend persists into the southwestern parts of the Usakos dome. However, this southwestern core of the dome is inundated by synkinematic granitic sheets. Distinct marker horizons of the Damara Sequence outcrop as screens within the granite, preserving a ghost stratigraphy. These screens illustrate the position and orientation of second-order folds. Significantly, most of the stratigraphy of the Damara Sequence is overturned in these folds. For example, some second-order anticlines developed in the northeastern parts of the Usakos dome can be followed along their axial traces into the southwestern hinge of the dome, where they appear as synformal anticlines, i.e. synformal structures cored by older strata, plunging towards the northeast. The inverted stratigraphy and northeasterly fold plunges suggest the northeast-trending folds are refolded by second-generation, northwest-trending folds, thus, forming kilometer-scale Type-2 interference folds. The resulting fold geometries are strongly non-cylindrical, approaching southwest-closing sheath folds indicating a top-to-the-southwest material transport. Lower-order folds in this overturned domain show radial fold plunges, plunging away from the centre of the dome core, as well as a shallowly-dipping schistosity. The close spatial and temporal relationship between granite intrusion and the formation of the southwest-vergent, sheath-type folds, radial distribution of fold plunges and the subhorizontal foliation confined to the southwestern hinge of the Usakos dome are interpreted to signify the rheological weakening and ensuing collapse of the developing first-order Usakos dome immediately above the synkinematic granite intrusions. Orogenparallel, southwest-vergent sheath folds and top-to-the southwest extrusion of the southwestern parts of the Usakos dome and northwest-vergent folding and thrusting characterizing the northeastern extent of the Usakos dome are both responses to the northwest-southeast- directed contractional tectonics recorded during the main collisional phase in the Damara belt. On a regional scale, the Usakos dome represents the link between the foreland-vergent northeastern part of the sCZ and the southwest-vergent, high-grade southwestern parts of the sCZ. The results of this study illustrate how dramatic variations in structural styles may be caused by the localized and transient rheological weakening of the crust during plutonic activity.
AFRIKAANSE OPSOMMING: Die noordoos-strekkende, suidelike Sentrale Sone (sSS) van die Pan-Afrikaanse Damara gordel in sentraal Namibië word karakteriseer deur kilometer-skaal, noordoosstrekkende koepel strukture, ontwikkel in die Neoproterozoïkum gesteentes van die Damara Opeenvolging. 'n Aantal verskillende struktuur modelle is voorgestel in die literatuur vir die vorming van hierdie koepels. Hierdie ondersoek beskryf die struktuur geologie van die Usakos koepel. Die ondersoek bespreek die strukturele ontwikkeling van die koepel in die regionale konteks van die sSS, wat die hoë graadse metamorfe magmatiese as van die Damara Gordel verteenwoordig, en karakteriseer word deur omvangryke Pan-Afrikaanse granitoïede. Die noordoostelike gedeelte van die Usakos koepel is ontwikkel as 'n antiklinorium met 'n vertikale- tot noordwestelike kantelrigting. wat 'n steil hellende, suidoostelike asvlak planêre foliasie bevat. Die noordoos-strekkende plooiing kom voor tot in die suidwestelike kern van die Usakos wat ingedring is deur sinkinematiese granitiese plate. Die posisie en oriëntasie van tweede-orde plooie is afgebeeld in die graniete deur 'n skimstratigrafie wat preserveer is deur duidelike merker horisonne van die Damara Opeenvolging. Die stratigrafie van die Damara Opeenvolging is opmerklik meestal omgekeer in hierdie plooie. Byvoorbeeld, tweede-orde antikliene ontwikkel in die noordoostelike gedeelte van die Usakos koepel kan gevolg word langs hul asvlakspore tot in die suidwestelike skarnier van die koepel, waar dit voorkom as sinforme antikliene, d.w.s. sinforme strukture met ouer strata in die kern wat na die noordooste duik. Die omgekeerde stratigrafie en noordoostelike plooi duiking impliseer dat die noordoosstrekkende plooie weer geplooi is deur tweede-generasie, noordwes-strekkende plooie, wat dus aanleiding gegee het tot die vorming van kilometer-skaal, tipe-2 interferensie plooie. Die gevolglike plooi geometrieë is uitdruklik nie-silindries, en toon 'n oorgang na skede plooie met 'n sluiting na die suidweste, wat dui op 'n bokant-na-die-suidweste materiaal vervoer. Laer-orde plooie in die omgekeerde domein vertoon radiale duiking van die plooie, weg van die middelpunt van die koepel kern, sowel as 'n vlak hellende skistositeit. Die noue ruimtelike en temporele verwantskap tussen graniet intrusie en die vorming van skede-tipe plooie met 'n kantelrigting na die suidweste, die radiale verspreiding van plooi duiking, en die subhorisontale foliasie wat beperk is tot die suidwestelike skarnier van die Usakos koepel, word interpreteer as 'n aanduiding van die reologiese verswakking en die gevolglike ineenstorting van die ontwikkelende eerste-orde Usakos koepel, onmiddellik aan die bokant van die sinkinematiese graniet intrusies. Die orogeenparalleie skede plooie met kantelrigting na die suidweste en bokant-na-die-suidweste ekstrusie van die suidwestelike gedeelte van die Usakos koepel, en plooiing met kantelrigting na die noordweste en stootverskuiwing wat kenmerkend is van die noordoostelike gedeelte van die Usakos koepel, is beide 'n reaksie op die noordwessuidoos- gerigte vernouings tektoniek opgeteken gedurende die hoof botsings fase in die Damara gordel. Op 'n regionale skaal verteenwoordig die Usakos koepel die verbinding tussen die noordoostelike gedeelte van die sSS met 'n voorland kantelrigting. en die hoë graad suidwestelike gedeelte van die sSS met 'n kantelrigting na die suidweste. Die resultate van hierdie ondersoek toon aan hoe dramatiese variasies in struktuur style veroorsaak kan word deur die gelokaliseerde en kortstondige reologiese verswakking van die kors gedurende plutoniese aktiwiteit.
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Prasad, Umesh. "Dynamic fracture characteristics of selected rocks." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36826.
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Fragmentation by blasting is distinct from other method of rock breakage due mainly to the short time scale involved in the application of stresses. In the present work, the dynamic rock properties, applicable to non-static fragmentation process have been measured and compared with measured values of other fracture related properties. Further, these are examined to establish correlation with respect to their physical, mineralogical and micro-structural characteristics. The rock types selected for the present work ranged from nearly homogenous isotropic rock to an-isotropic rocks. The nearly isotropic rock were represented by three different types of granites. The an-isotropic rocks consisted of gneissic granite, gneiss, marbles, limestone, and quartz.The dynamic compressive strength, measured under a strain rate of 10 3/sec, has been found to be about 2.5--4.6 times the compressive strength measured under static conditions (strain rate of 10-6 /sec) for similar dimensions of rock samples in a wide variety of rock types. It has also been found that this ratio is higher for low strength rocks, and lower for high strength rocks.
The particle size distribution resulting from high velocity impact breakage is much smaller than in the static case. The degree of fineness (50% passing) generated under dynamic breakage is well correlated with the dynamic compressive strength; however, there appears to be no correlation between static compressive strength and the corresponding fragment size distribution.
Except for static compressive strength, the dynamic strength was found to have no significant correlation with the measured values of fracture toughness, tensile strength, or comminution work index.
The fracture toughness value is found to be controlled by the largest crack or grain size and to some extent, by porosity. The effect of crack density appeared to be non-linear; the fracture toughness initially decreases with increase in crack density, but further increase in the latter results an increase in toughness. This suggests the behaviour of rocks in dynamic compressive breakage is different than that due to static single crack growth.
The work index (WI), which represents a fracture process at an intermediate strain rate correlates better with the Brazilian tensile strength than the static and high strain rate compressive strengths. (Abstract shortened by UMI.)
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Grütter, Hermanus Smalberger. "Structural and metamorphic studies on Ios, Cyclades, Greece." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282815.
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Abou-Hamdan, Amira. "A structural and dynamic study of cryptates /." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09pha154.pdf.
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Jung, Haeil. "Structural dynamic model updating using eigensensitivity analysis." Thesis, Imperial College London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262543.
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Jones, E. Y. "Structural and dynamic studies on biological macromolecules." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371551.
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Smith, Keith J. "Multivariable control of dynamic structural test systems." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/13857.
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Multi-actuator structural testing has traditionally been regarded, from a control point of view, as a multi-loop single-input, single-output problem. This approach does not take into account the interaction between. different actuators, due to the dynamics of the structure under test, which can be considerable. The result of this is often poor laboratory reproduction of the actual service data. This project shows that the mass of the structure under test has a considerable impact upon the stability of the traditional multi-loop, single-input, single-output control system. Where stability is prejudiced, the loop gains have to be reduced to maintain stability and this can degrade the performance of the test. In these circumstances multivariable control offers the potential for a significant improvement in performance. Two experimental rigs are used in this project, both exhibit major interaction and pose a significant control problem. The first rig consists of a laboratory scale cantilever beam excited by two electro-dynamic vibrators with displacements measured by Linear Variable Differential Transformers (L VDTs). The second, industrial-scale, rig consists of a large steel frame excited by two hydraulic actuators with applied force measured by load cells. Multivariable controllers are designed and implemented on these rigs based on the frequency-domain Characteristic Locus method. The multivariable controllers are shown to demonstrate superior performance to traditional multi-loop controllers. Mathematical models of the rigs are not required for controller design, instead experimental frequency responses are all that are needed. This is a major attraction of the Characteristic Locus method since the task.of modelling the dynamics of a multichannel structural test system is not trivial. However, obtaining the frequency response of the second rig is made difficult by the imposition of closed-loop control during the identification experiment. A technique is presented to overcome this problem using an existing correlation method.
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Brownjohn, J. M. W. "Assessment of structural integrity by dynamic measurements." Thesis, University of Bristol, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381375.
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Margineantu, Daciana H. "Structural and dynamic studies of mitochondrial heterogeneity /." view abstract or download file of text, 2001. http://wwwlib.umi.com/cr/uoregon/fullcit?p3035570.
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Thesis (Ph. D.)--University of Oregon, 2001.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 119-130). Also available for download via the World Wide Web; free to University of Oregon users.
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Foliente, Greg C. "Stochastic dynamic response of wood structural systems." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-05042006-164535/.
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