Dissertations / Theses on the topic 'Plate coupling'
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Zanfir, Monica. "Catalytic plate reactors for endothermic-exothermic reaction coupling." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270199.
Full textLam, Wai-yin. "Plate-reinforced composite coupling beams experimental and numerical studies /." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37311797.
Full textLam, Wai-yin, and 林慧賢. "Experimental study on embedded steel plate composite coupling beams." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B26643352.
Full textLam, Wai-yin, and 林慧賢. "Plate-reinforced composite coupling beams: experimental and numerical studies." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37311797.
Full textCheng, Pak Cheung. "Shear capacity of steel-plate reinforced concrete coupling beams /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20CHENG.
Full textIncludes bibliographical references (leaves 241-245). Also available in electronic version. Access restricted to campus users.
FORTNEY, PATRICK JOSEPH. "THE NEXT GENERATION OF COUPLING BEAMS." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1115837131.
Full textArapan, Lilia. "Thin Film Plate Acoustic Resonators for Frequency Control and Sensing Applications." Doctoral thesis, Uppsala universitet, Fasta tillståndets elektronik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-178592.
Full textYilmazel, Canan. "Analysis Of High Frequency Behavior Of Plate And Beam Structures By Statistical Energy Analysis Method." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605133/index.pdf.
Full textRichart, Nicolas. "Conception et mise en oeuvre d'une plate-forme de pilotage de simltions numériques parallèles et distribuées." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR13991/document.
Full textThe numerical simulations evolve more and more to simulations of complex physical phenomena through multi-scale or multi-physics codes. For these kind of simulations data analysis is a main issue for many reasons, as detecting bugs during the development phase or to understand the dynamic of the physical phenomena simulated during the production phase. The computational steering is a technique well suited to do all this kind of data analysis. The goal of this thesis is to design and develop a computational steering framework that take into account the complexity of coupled simulations. So, through a computational steering client we want to interact coherently with data generated in coupled simulations. This afford for example to visualize on-line the intermediate results of simulations. In order to make this possible we will introduce an abstract model that enables to represent coupled simulations and to know when we can interact coherently with them. These works have been validated on a legacy multi-scale simulation of material physics
Chee, Clinton Yat Kuan. "STATIC SHAPE CONTROL OF LAMINATED COMPOSITE PLATE SMART STRUCTURE USING PIEZOELECTRIC ACTUATORS �." University of Sydney. Aeronautical Engineering, 2000. http://hdl.handle.net/2123/709.
Full textOsei, Tutu Anthony [Verfasser], Michael [Akademischer Betreuer] Weber, Bernhard [Akademischer Betreuer] Steinberger, and Irina [Akademischer Betreuer] Rogozhina. "Linking global mantle dynamics with lithosphere dynamics using the geoid, plate velocities and lithosphere stress state as constraints : lithosphere and mantle dynamics coupling / Anthony Osei Tutu ; Michael H. Weber, Bernhard Steinberger, Irina Rogozhina." Potsdam : Universität Potsdam, 2018. http://d-nb.info/1218403330/34.
Full textOsei, Tutu Anthony [Verfasser], Michael H. [Akademischer Betreuer] Weber, Bernhard [Akademischer Betreuer] Steinberger, and Irina [Akademischer Betreuer] Rogozhina. "Linking global mantle dynamics with lithosphere dynamics using the geoid, plate velocities and lithosphere stress state as constraints : lithosphere and mantle dynamics coupling / Anthony Osei Tutu ; Michael H. Weber, Bernhard Steinberger, Irina Rogozhina." Potsdam : Universität Potsdam, 2018. http://d-nb.info/1218403330/34.
Full textFuchs, Lukas. "Strain quantifications in different tectonic scales using numerical modelling." Doctoral thesis, Uppsala universitet, Mineralogi, petrologi och tektonik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-280759.
Full textBonnet, Guillaume. "Seamount subduction in the Zagros Suture Zone : structural and petrologic characterization and implications for seismogenesis." Electronic Thesis or Diss., Sorbonne université, 2018. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2018SORUS526.pdf.
Full textEamounts are for the most part subducted with the downgoing oceanic plate. They are expected to critically impact the mechanical and seismogenic behavior of subduction zones, but their exact role is strongly debated (i.e. as to whether they represent barriers to propagation or asperities promoting nucleation). Rare natural examples of metamorphosed seamounts, that got sliced off the slab along the plate interface are therefore precious witnesses to document processes operating at depth.This PhD thesis reports the existence of a former seamount in the Zagros suture zone (the Siah Kuh unit).This 20x12 kilometer-large, minimum 1.5 km-high unit composed of pillow basalts capped by reef limestone was formed in an arc environment during the Late Cretaceous.HP-LT minerals (lawsonite, aragonite veins, blue amphibole) found across the whole structure, particularly in zones of localized compressive deformation, indicate that this seamount was shallowly subducted at 30 km. Syn-subduction deformation is assisted by dŽcollement rooting in serpentinite and/or oceanic sediments and is related to the internal slicing of the seamount. The presence of soft layers may prevent most of the seismic activity, since only one pseudotachylite, recording a Mw2-3 earthquake has been found. The Siah Kuh unit is also a perfect target to investigate oceanic processes such as slope destabilization and subsidence, and subduction processes such as mechanical coupling, fluid/tectonic overpressure and the nature of subduction fluids. We finally build a model for the tectonic evolution of the Siah Kuh unit and its relationship with other ophiolites
Shim, Kar Wei. "Mixed dimensional coupling for laminated structures in finite element analysis." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269169.
Full textHoon, K. H. "Buckling behaviour of intermediately stiffened plate elements." Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372102.
Full textPark, Woo Sun. "The sources of variability in the statistical energy analysis of two rectangular plates." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271652.
Full textCheng, Bei, and 程蓓. "Retrofitting of deep concrete coupling beams by laterally restrained side plates." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45791132.
Full textLOPES, STEFANE RODRIGUES XAVIER. "THE INFLUENCE OF THE MODAL COUPLING IN THE STABILITY OF PLATES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1267@1.
Full textNessa dissertação, são avaliados os comportamentos crítico e pós-crítico de uma placa retangular fina, simplesmente apoiada, sob compressão. Um modelo não-linear para placas perfeitas e com imperfeições é desenvolvido com base na teoria não-linear de placas proposta por Marguerre. O modelo discretizado possui dois graus de liberdade que são caracterizados pela flambagem em m e (m+1) meia-ondas senoidais na direção do carregamento. Obtém-se analiticamente soluções desacopladas e acopladas através de programas de álgebra simbólica (Maple V Realese 4). Realiza- se um detalhado estudo paramétrico visando identificar todas as possíveis configurações de equilíbrio e, para cada configuração determinada, analisa-se sua estabilidade. É também estudada a influência de imperfeições geométricas iniciais, tanto na superfície de energia quanto no número e estabilidade das soluções. Os resultados mostram que o acoplamento modal tem uma grande influência sobre o comportamento pós-crítico destas placas, podendo provocar mudanças bruscas dos modos de flambagem. Finalmente, é analisada a influência das imperfeições e tensões de compressão inicias nas freqüências naturais da placa, mostrando como estas freqüências podem ser utilizadas para determinar cargas críticas sem a necessidade de execução de ensaios destrutivos.
The buckling and post buckling behavior of simply supported thin rectangular plates in axial compression is considered in this dissertation. A non- linear model for perfect and imperfect plates is developed based on Marguerre non-linear plate theory. The discretized model is considered as having two degrees of freedom characterized by buckling in m and (m+1) halfsinewaves axially and uncoupled and coupled solutions are obtained analytically by the use of symbolic algebra software. A detailed parametric study is conducted to identify all possible equilibrium solutions and establish their stability. The influence of initial geometric imperfections on the energy surface, number and stability of solutions is taken into account as an indispensable part of the analysis. The results shown that modal coupling has a strong influence on the post-buckling behavior of these plates and may explain abrupt changes of waveform of plates in the post-buckling range. Also, the influence of imperfections and initial compressive stress on the natural frequencies of the plate is analyzed and it is shown how these frequencies can be used to estimate safe buckling loads of rectangular plates non-destructively.
Este trabajo presenta un análisis experimental de cinco vigas de concreto, simplemente apoyadas, protendidas con cables sintéticos externos, con el objetivo de estudiar la influencia de la resistencia del concreto en la variación de la fuerza de los cables de protensión y en la resistencia a la flexión de las vigas. La protensión de las vigas fue hecha con cables sintéticos conocidos como Parafil, con resistenciaa la tracción de 1950MPa y módulo de elasticidad de 126000MPa. La única variable considerada fue la resistencia del concreto, cuyos valores fueron 36, 57, 73, 74 y 104MPa. El concreto de las vigas con resistencia de 57, 73, 74 y 104MPa fueron construidos con el uso de la microsílica y aditivo superplastificante, con excepción de la viga con resistencia de 36MPa que fue construida con concreto común. Los resultados mostraron que la influencia de la resistencia del concreto sobre la resistencia a la flexión de las vigas no es grande. Para el aumento de 189% en la resistencia del concreto, se produjo un aumento en la variación de la fuerza en el cable de apenas 13.6% y un aumento de 33% en el momento de ruptura. Comparando los resultados experimentales con los resultados de las principales normas y modelos propuestos se verificó que todos ofrecen buenos resultados y subestiman los valores experimentales. Comparando los resultados experimentales con el modelo de Campos (1993) se observó que los valores de la variación en la fuerza en el cable superestiman los valores experimentales. 1267 En esta disertación, se evalúan los comportamientos crítico y poscrítico de una placa rectangular fina, simplemente apoyada, bajo compresión. Se desarrolla un modelo no lineal para placas perfectas y con imperfecciones teniendo como base la teoría no lineal de placas propuesta por Marguerre. El modelo discretizado posee dos grados de libertad que son caracterizados al flamear en m y (m+1) medias-ondas senoidales en la dirección de sobrepeso. Se obtienen analíticamente soluciones desacopladas y acopladas a través de programas de álgebra simbólica (Maple V Realese 4). Se realiza un detallado estudio paronétrico tratando de identificar todas las posibles configuraciones de equilibrio y, para cada configuración determinada se analisa la estabilidad. También se estudia la influencia de imperfecciones geométricas iniciales, tanto en la superfície de energía como en el número y estabilidad de las soluciones. Los resultados muestran que el acoplamiento modal tiene una gran influencia sobre el comportamiento poscrítico de estas placas, lo que puede provocar cambios bruscos de los modos de flamear. Finalmente, se analiza la influencia de las imperfecciones y tensiones de compresión iniciales en las frecuencias naturales de la placa, mostrando como estas frecuencias pueden ser utilizadas para determinar cargas críticas sin necesidad de ejecución de ensayos destructivos.
Almitani, Khalid H. "Minimizing the acoustic coupling of fluid loaded plates using topology optimization." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9206.
Full textThesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Hartmann, Nicolai. "Coupling of emitters to surface plasmons investigated by back focal plane microscopy." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-164238.
Full textVillanueva, Robles Fernando. "The role of the Investigator Fracture Zone in the Sumatra subduction zone process using high-resolution bathymetry, seismic data, and numerical geodynamic models." Thesis, Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCC074.
Full textMajor earthquakes occur mainly on subduction plate boundaries, but what causes the along strike earthquake segmentation remains poorly understood. To understand earthquake segmentation, I have processed, analysed and interpreted high-resolution seismic reflection and multibeam bathymetry data acquired during the MegaTera experiment of 2015. The MegaTera survey covered an area where the Investigator Fracture Zone (IFZ), a linear group of long ridges, impinges the trench along the central Sumatra subduction zone. The interpretation results show the subduction of these four groups of ridges has a considerable impact on the accretionary wedge morphology, including strike-slip and normal faulting, along with thrusts, leading to the development of complex channel systems and basins, and hence erosion. The relief of IFZ ridges has uplifted the forearc sediments, creating subsidence in the wake of subducting ridges. Frontal parts of the subducting ridges have created long-lived thrusts, whereas the décollement horizontally passes through the sedimentary sequences on the top of two neighbouring ridges. Additionally, I have performed 3-D numerical geodynamic models to study the effects of oblique subduction of ridges on the persistent stress evolution and the permanent forearc deformation patterns. Finally, I have analysed and compared the numerical experiments to the interpretation of the seafloor and subsurface features. The overall results indicate the subducting IFZ create heterogeneous wedge deformation and stress behaviour along the accretionary prism. Hence, the subduction of the IFZ might promote a heterogeneous inter-plate coupling, acting as a segment boundary and being a proper candidate for having stopped the south-eastward propagation of the 2005 Mw 8.7 Nias-Simeulue earthquake
Fu, Bin. "Advanced fracture mechanics analysis of shallow surface cracks in fillet welded T-butt plate joints." Thesis, University of Newcastle Upon Tyne, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363860.
Full textWaksmanski, Natalie P. "Static and Dynamic Analyses of Layered Composite Plates with Multiphase Coupling and Nonlocal Effects." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1478775596863257.
Full textLeray, Cedric. "Etude du comportement thermique et thermomécanique des récepteurs solaires sous haut flux radiatif." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0003/document.
Full textFor the future, using thermodynamical solar power plant seems to be a good solution to ensure electrical production. Solar tower plants are able to produce electricity in significant amount, are environmentally friendly and economically competitive. One way to increase the yield of these plants is using high efficiency thermodynamical cycles, like combined cycle. That requires to providing a working fluid at high temperature and high pressure (10bar and 1000°C at least). This PHD thesis presents the works performed to develop and enhance a concept of modular plate solar ceramic absorber that can ensure the required air production. We chose the silicon carbide as material due to its resistance to high temperatures and oxidation problems. The drawback is ceramic modules are weak to traction stresses. The study focuses on the knowledge and the control of this phenomenon. This work combines the developments of numerical tools and experimental studies performed at Thémis power plant (Targassonne, 66, FRANCE). The numerical method permits simulations to predict the thermal behavior and the mechanical behavior of a solar module absorber. It allows the reduction of the mechanical stresses undergone by solar receiver and the prediction of its performances. This methodology was tested using experimental results
Van, der Merwe Jacki. "The effect of mutual coupling on the noise performance of large antenna arrays." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4277.
Full textENGLISH ABSTRACT: Worldwide, more large antenna arrays are being deployed in areas of science previously dominated by other antenna geometries. Applications for large arrays include Radar, Satellite Communications and Radio Astronomy. Even though the use of large arrays solve some of the difficulties posed by more traditional antennas, new challenges are also faced. One of these challenges is the problem of noise coupling, and how the overall system performance is affected by it. The Focal Plane Array (FPA), which is a new example of a large antenna array, is currently being researched at a number of institutions worldwide for use in Radio Astronomy. As a result, FPA’s were used as an example element to demonstrate the practical importance of this research. In this study, the effect of mutual coupling on the noise performance of FPA’s was illustrated. This was done by calculating the mutual coupling between the elements of the array, and then calculating the noise power received by each element as a result of the mutual coupling. Next, the Active Noise Figure and Active Noise Temperature were calculated. These parameters were introduced to visualise the effect of mutual coupling on the overall noise performance of the array. Since FPA’s are by definition large, conventional brute-force analysis techniques are very resource intensive. Solving the coupling terms using these methods therefore requires the use of computer clusters even during the design phase of the antenna, which is very expensive. A method was therefore developed to calculate the coupling terms of a large array using Periodic Boundary Conditions. The method uses infinite array analysis, which resulted in an improvement in memory usage in orders of magnitude. This improvement comfortably places the memory requirements for the analysis of large arrays within the range of current personal computers. The results also displayed a reasonable amount of accuracy for use during the design phase of an array. The additional noise power on each element as a result of mutual coupling were also calculated. This was achieved by developing an equivalent circuit diagram that represents the system in terms of the noise and transmission parameters of the LNA of each receiver channel, and the coupling terms of the antenna array. Lastly, the active noise temperature and active noise figure are calculated. The theory was implemented by means of a script with a graphical user interface, to provide easy-to-use access to the theory. A quick reference table of estimated noise coupling penalty versus first term coupling and LNA noise temperature was also compiled. The results of an example calculation showed a significant amount of noise coupling in an 8×8 Vivaldi array. The noise coupling resulted in an increase in system noise temperature, Tsys, in the order of 9% of the LNA noise temperature, TLNA. According to the SKA Tsys budget, this results in an approximate Tsys increase of 1.3 Kelvin. In the context of Radio Astronomy, this additional source of noise cannot be ignored, as it can greatly affect the usebility of the telescope for certain areas of research.
AFRIKAANSE OPSOMMING: Groot antennaskikkings word deesdae al hoe meer ingespan in plek van ander tradisionele antennamodelle. Toepassings vir groot antennaskikkings sluit Radar, Satellietkommunikasie en Radioastronomie in. Alhoewel die gebruik van groot antennaskikkings baie van die probleme wat deur ander tradisionele antennamodelle veroorsaak word oplos, word nuwe uitdagings terselfdertyd geskep. Een van hierdie nuwe uitdagins is ruiskoppelling en hoe dit die ruisgedrag van die stelsel as ’n geheel affekteer. ’n Beeldvlakskikking (FPA), is ’n opwindende nuwe voorbeeld van ’n groot antennaskikking en die moontlikheid vir die gebruik daarvan in radioastronomie word tans wêreldwyd nagevors. Om hierdie rede is die FPA gekies as voorbeeldelement om die bruikbaarheid van hierdie navorsing in die praktyk te beklemtoon. In hierdie studie word die effek van wedersydse koppelling op die ruisgedrag van FPA’s geïllustreer. Dit word gedoen deur eers die wedersydse koppelling tussen die elemente van die antennaskikking te bereken en dan die ruisdrywing wat deur elke element ontvang word as gevolg van wedersydse koppelling. Daarna word die Aktiewe Ruistal en die Aktiewe Ruistemperatuur bereken. Hierdie nuwe parameters word bekendgestel om die gevolge van wedersydse koppelling op die ruisgedrag van die stelsel as ’n geheel te visualiseer. Omdat FPA’s per definisie groot is, vereis die analise daarvan deur middel van konvensionele metodes baie rekenaar hulpbronne. Hierdie metodes vereis dus die gebruik van rekenaarbondels of superrekenaars selfs gedurende die ontwerpfase van die antenna, wat baie duur en onprakties is. Daar is dus ’n metode ontwikkel wat gebruik maak van periodiese randvoorwaardes om groot antennaskikkings te analiseer. Die metode benader ’n groot antennaskikking as ’n eindig-opgewekte oneindige skikking van antennas. As gevolg hiervan, word die geheueverbruik met ordegroottes verbeter. Hierdie verbetering plaas dus die analise van groot antennaskikkings binne die vermoëns van huidige persoonlike rekenaars. Die resultate wys ook ’n aanvaarbare graad van akkuraatheid vir gebruik gedurende die ontwerpfase van die skikking. Die bykomende ruisdrwying op elke element as gevolg van wedersydse koppelling is ook bereken. Om dit te vermag, is daar ’n ekwivalente stroombaandiagram ontwikkel wat die gekoppelde stelsel in terme van die ruis- en transmissieparameters van die laeruisversterker (LNA) aan elke ontvangerkanaal en die koppelterme van die antenna skikking voorstel. Laastens word die aktiewe ruistal en die aktiewe ruistermperatuur ook bereken. Die teorie is geïmplimenteer deur gebruik te maak van ’n grafiesegebruikerskoppelvlak (GUI). Die GUI verskaf aan die gebruiker maklike toegang tot die teorie wat onwikkel is in hierdie navorsing. Daar is ook ’n snelnaslaantabel geskep met benaderde waardes van ruiskoppelling vir ’n verskeidenheid waardes van LNA ruistemperature en eerste element koppelling. Die resultate van ’n 8×8 Vivaldiskikking voorbeeld, het ’n beduidende hoeveelheid ruiskoppelling getoon. Die ruiskoppelling het ’n maksimum toename in stelsel ruistemperatuur, Tsys, van ongeveer 9% van die LNA ruistemperatuur tot gevolg gehad. Volgens die huidige Tsys begroting van die SKA, kom dit neer op ’n Tsys toename van byna 1.3 Kelvin. In die konteks van die radioastronomie, kan hierdie toename in ruistemperatuur nie geïgnoreer word nie aangesien dit die bruikbaarheid van die teleskoop vir sekere velde van navorsing nadelig kan beïnvloed.
Sun, Liecheng. "ANALYTICAL STRIP METHOD TO ANTISYMMETRIC LAMINATED PLATES." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/715.
Full textPapastefanakis, Dimitrios. "Orthoptere : etude aerodynamique d'une eolienne a axe vertical et sa regulation energetique par microprocesseur." Paris 6, 1986. http://www.theses.fr/1986PA066517.
Full textZhu, Yong. "Retrofitting of reinforced concrete coupling beams by bolted side steel plates for strength and deformability." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36434048.
Full textZhu, Yong, and 朱勇. "Retrofitting of reinforced concrete coupling beams by bolted side steel plates for strength and deformability." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36434048.
Full textWenzel, Christian. "Local FEM Analysis of Composite Beams and Plates : free-Edge effect and Incompatible Kinematics Coupling." Thesis, Paris 10, 2014. http://www.theses.fr/2014PA100107/document.
Full textThis work considers local stress concentrations, especially the free-Edge effects of multilayered structures. At the interface of two adjacent layers with different elastic properties, the stresses can become singular in the intermediate vicinity of the free edge. This is valid while assuming a linear elastic material behaviour. As a consequence this zones are an essential delamination trigger. Via the Carrera Unified Formulation (CUF), different kinematical models are testes in order to obtain the correct local stress concentration. In the first part of this work, the reduced dimensional modelling approaches are compared. Two main class are presented: Equivalent Single Layer (ESL) models treating the layered structure like one homogenous plate of equal mechanical proper- ties, and the Layer Wise approach, treating each layer independently. Subsequently their capabilities to capture the appearing singularities are compared. In order to have a comparable measurement of those singularities, the obtained stress distributions will be expressed via a power law function, which has a priori a singular behaviour. Only two parameters fully describe therefore the singular stress components in the vicinity of the free edge. With the help of these two parameters not only the different models capabilities will be compared, but also the free edge effect itself will be measured and compared for different symmetrical laminates and the case of extensional and uniform bending load. The results for all laminates under both load cases confirm the before stated need for rather complex models in the vicinity of the free edge. However far from the free edges, in the composite plates centre, no significant difference can be noted for rather simple models. The second part of this work is therefore dedicated to the coupling of kinematically incompatible models. The use of costly expensive complex models is restricted to local domains of interest, while economic simple models will model the global do- main. The Extended Variational Formulation (XVF) is identified as the most suitable way to couple the kinematically heterogenous but dimensional homogenous models. As it uses a configuration with one common interface without domain overlap, the additional efforts for establishing the coupling are limited. Further the XVF offers the possibility to adapt the conditions imposed at the interface using a single scalar parameter. It will be shown that for the homogenous dimensional problem under consideration only two different conditions can be imposed by this parameter. One matching the strong conditions imposed by the classical Multi Point Constrains (MPC) and a second one providing a weak condition. The last one is shown to provide the possibility to reduce further the domain using the complex kinematical model, without the loss of local precision. As this is the first application of the XVF towards composite structures, the need for a new coupling operator was identified. A new form is proposed, tested and its robustness will be evaluated
Hawkins, Guy Lawrence. "The behaviour of bonded out-of-plane joints in fibre reinforced plastic structures." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261750.
Full textHan, Chao. "3D state space analysis and free-edge effect of piezoelectric laminated thick plates." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/3d-state-space-analysis-and-freeedge-effect-of-piezoelectric-laminated-thick-plates(13cf01e1-8c3a-419e-aaf0-31b818b9c069).html.
Full textHartmann, Nicolai [Verfasser], and Achim [Akademischer Betreuer] Hartschuh. "Coupling of emitters to surface plasmons investigated by back focal plane microscopy / Nicolai Hartmann. Betreuer: Achim Hartschuh." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1046503197/34.
Full textNewman, Michael Geoffery. "Mathematical modelling of creep in weldments using the Cosserat theory of plates and shells." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239654.
Full textSanchis, Kilders Pablo. "Coupling techniques between dielectric waveguides and planar photonic crystals." Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/1854.
Full textSanchis Kilders, P. (2005). Coupling techniques between dielectric waveguides and planar photonic crystals [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/1854
Palancia
Dutta, Maitreya. "Hysteresis in the Conductance of Quantum Point Contacts with In-Plane Side Gates." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1396530257.
Full textKokkinos, Filis-Triantaphyllos T. "Three-dimensional layerwise modeling of layered media with boundary integral equations." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-02132009-170805/.
Full textGonneau, Vincent. "Modélisation du transfert thermique par marcheurs browniens dans des milieux hétérogènes." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST022.
Full textThis work deals with the modeling of transient conduction heat transfer by brownian walkers within a heterogenous medium. The medium is described by a 3D voxelised structure. Each walker carries an elementary enthalpy during its movement. This enthalpy motion represents the thermal flux and allows to solve quantitatively the transient thermal conduction. A study demonstrates the importance of the time step chosen in the simulations. An empirical value of this parameter, based on the spatial resolution and the thermal diffusivities of the constituents, has been established to model accurately the conduction at each step of the heat transfer. Several problems related to the behavior of the walkers had to be solved to model two well-known experimental thermal characterization techniques: the hot guarded plate technique and the flash method. An imposed temperature condition is modeled by a reservoir where the number of walkers is regulated. An adiabatic wall condition imposes a specular reflection to the walkers. A stochastic transmission criterion, based on the thermal effusivities, was established to treat the behavior of a walker at voxel-voxel interface between two different constituents. Convective losses at a boundary of the numerical structure are represented by an analogous stochastic transmission criterion involving the effusivity, the convective exchange coefficient and the time step. An imposed thermal flux condition, of any temporal profile, is modeled by an injection of walkers through the boundary. The complex combination of these computing blocks allowed to model transient heat transfer within voxelised heterogeneous structures. The comparison between our results and those issued from more classical approaches allowed to validate the ability of our model to characterize the phonic thermal properties of virtual and real structures. We conclude this PhD work with preliminary activities aiming at the simulation of conduction-radiation coupling at the voxel scale of the structure: the radiative contribution is modeled by an internal power source term within the voxels
Elagiri, Ramalingam Rajkumar. "Development of a hybrid method for investigating near-field radiated couplings on electric cables above the GND plane." Rouen, 2012. http://www.theses.fr/2012ROUES035.
Full textCe travail de thèse a pour objectif de développer une méthodologie globale pour l’analyse des effets électriques de couplage causés par les champs proches ElectroMagnétiques (EM) rayonnées par des dispositifs électriques et électroniques dans une bande de fréquence ultra large sur des câbles électriques. La méthode proposée est basée sur l’association des champs EM définis à partir des simulations, modélisations ou des mesures avec des modèles semi-analytiques pour évaluer la tension de couplage à travers le câble. L’originalité de la méthode de calcul hybride étudiée pour cette thèse repose sur son adaptabilité aux agressions incluant les ondes évanescentes et aux différents types de structures électriques et électroniques pour divers positions entre les sources de perturbation et les câbles victime et aussi sa validité sur une bande de fréquence ultra large. Des méthodologies indiquant de lignes directrices pour l’application de la méthode hybride proposée en fonction des types de structures considérées ont été proposées. Les résultats analytiques mettant en évidence la pertinence de la méthode en considérant les champs proches rayonnés par un réseau des dipôles élémentaires sont d’abord introduits. Ensuite, des études expérimentales de l’analyse des champs proches basse fréquence et radiofréquences émis par des circuits électroniques permettant les prédictions des tensions de couplage à travers les câbles électriques de longueur de l’ordre de quelques mm à quelques m en considérant le rayonnement des antennes patch à partir de 0,5 GHz à 4 GHz sont présentés. Enfin, les analyses numériques montrant l’efficacité de la méthode hybride en considérant diverses formes réalistes complexes des fils électriques victimes des agressions des champs EM ont également été réalisées et validées. La méthode développée dans cette thèse est particulièrement utile pour prédire le couplage entre les structures complexes dans des bandes de fréquences de quelques kHz à plusieurs GHz
Sprouse, Garrett William. "Coupling fluvial-hydraulic models to study the effects of vegetation on sediment transport and flow dynamics in the South Platte River, Colorado." Thesis, University of Colorado at Boulder, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10162882.
Full textThis study investigated the effects of riparian vegetation on sediment transport rates and flow dynamics in the South Platte River just downstream of Fort Lupton, Colorado. FaSTMECH, a two-dimensional coupled fluvial and hydraulic model, was used to compute flow characteristics (velocity and depth) in addition to sediment mobility characteristics (shear stress and sediment flux) for four discharge levels ranging from 5% of bankfull flow to bankfull flow (Qbf). Estimates of a dimensionless drag coefficient (Cd) representative of the middle-aged bushy willows found on the river banks at the study site were used to create a spatially variable roughness in the model throughout the river reach. Model results show that during average annual flood events, vegetation on the river banks causes increased drag forces on the flow, leading to an increased proportion of flow being diverted into the main channel and resulting in higher velocities. The spatial distribution of shear stresses collapse under these conditions with an order of magnitude decreases over river banks and significant increases throughout the main channel. Sediment fluxes in the reach increase by nearly an order of magnitude with the presence of bank vegetation, however, the greatest differences occur during Qbf when the highest fraction of the sediment is mobile. Further analysis of vegetation effects was conducted by performing a sensitivity analysis by altering the representative non-dimensional vegetation drag coefficient by as much as +/- 400%. These alterations represent differences in vegetation density, height, orientation, leafy/leafless structure, age, rigidity, and vegetation type. Although there is a relationship between sediment fluxes and changes in Cd, there only exists a 14% increase in transport at Qbf between the two exterior limits of Cd.
Font, Molins Marc. "Model aryl halide macrocyclic substrates for the elucidation of coinage metal catalysed cross-coupling reaction mechanism." Doctoral thesis, Universitat de Girona, 2015. http://hdl.handle.net/10803/285975.
Full textEspècies aril-Cu(III) han estat implicades sovint com les espècies a través de les quals operen els acoblaments tipus Ullmann. No obstant, aquestes espècies han restat elusives, així com els processos fonamentals que governen els acoblaments tipus Ullmann, descoberts per primer cop al començament del segle passat, romanen encara objecte de debat. La primera part d’aquesta tesi s’ocupa de la reactivitat d’un complex aril-Cu(III) ben definit, en presència de nucleòfils basats en sofre, seleni i fósfor. Els resultats obtinguts demostren la plausibilitat de cicles redox Cu(I)/Cu(III) en les reaccions d’acoblament creuat per a la formació d’enllaços C-S, C-Se i C-P catalitzades per coure. Un complex aril-Ag(III) anàleg al complex aril-Cu(III) va ser sintetitzat i va ser demostrat que les seves reaccions d’acoblament en presència d’un ampli rang de nucleòfils de diferent naturalesa tenen lloc via eliminació reductiva. Els resultats d’aquesta tesi validen per primer cop la factibilitat de processos d’addició oxidant i eliminació reductiva en centres de plata i revelen un mecanisme basat en cicles redox Ag(I)/Ag(III) de dos electrons en reaccions d’acoblament creuat catalitzades per plata.
Neděla, Lukáš. "Zesílení silničního mostu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265570.
Full textNiezgoda, Mathieu. "Modélisation du transfert thermique au sein de matériaux poreux multiconstituants." Phd thesis, Université d'Orléans, 2012. http://tel.archives-ouvertes.fr/tel-00829217.
Full textAra?jo, Gilmara Linhares Ramos de. "Efeito da inclina??o do plano de terra para antenas de microfita multicamadas com elementos parasitas fractais." Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15363.
Full textCoordena??o de Aperfei?oamento de Pessoal de N?vel Superior
This work presents the analysis of an antenna of fractal microstrip of Koch with dielectric multilayers and inclinations in the ground plane, whose values of the angles are zero degree (without inclinations), three, seven and twelve degrees. This antenna consists of three dielectric layers arranged vertically on each other, using feeding microstrip line in patch 1, of the first layer, which will feed the remaining patches of the upper layers by electromagnetic coupling. The objective of this work is to analyze the effects caused by increase of the angle of inclination of the ground plane in some antenna parameters such as return loss, resonant frequency, bandwidth and radiation pattern. The presented results demonstrate that with the increase of the inclination angle it is possible to get antennas with characteristics multiband, with bigger bandwidth, and improving the impedance matching for each case analyzed, especially the larger angle
Este trabalho apresenta a an?lise de uma antena de microfita fractal de Koch com multicamadas diel?tricas e inclina??es no plano de terra, cujos valores dos ?ngulos s?o zero grau (sem inclina??es), tr?s, sete e doze graus. Esta antena ? constitu?da por tr?s camadas diel?tricas dispostas verticalmente umas sobre as outras, utilizando alimenta??o por linha de microfita no patch 1, da primeira camada, que ir? alimentar os demais patches das camadas superiores por acoplamento eletromagn?tico. O objetivo deste trabalho ? analisar os efeitos causados pelo aumento do ?ngulo de inclina??o do plano de terra em alguns par?metros da antena, tais como perda de retorno, frequ?ncia de resson?ncia, largura de banda e diagrama de radia??o. Os resultados apresentados demonstram que com o aumento do ?ngulo de inclina??o ? poss?vel obter antenas com caracter?sticas multibanda, com maiores larguras de banda, al?m de melhoramento do casamento de imped?ncias para cada caso analisado, sobretudo os de maior ?ngulo de inclina??o
Abidin, Z. Z. "Design, modelling and implementation of antennas using electromagnetic bandgap material and defected ground planes. Surface Meshing Analysis and Genetic Algorithm Optimisation on EBG and Defected Ground Structures for Reducing the Mutual Coupling between Radiating Elements of Antenna Array and MIMO Systems." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5385.
Full textMinistry of Higher Education Malaysia and Universiti Tun Hussein Onn Malaysia (UTHM)
Abidin, Zuhairiah Zainal. "Design, modelling and implementation of antennas using electromagnetic bandgap material and defected ground planes : surface meshing analysis and genetic algorithm optimisation on EBG and defected ground structures for reducing the mutual coupling between radiating elements of antenna array MIMO systems." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5385.
Full textCarmo, Regina Maria dos Santos. "Determinação da rigidez de estruturas de pavimentos através dos métodos dos elementos de contorno e finitos." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-05042016-135834/.
Full textThis research refers to the numeric analysis of structures, emphasizing the use of the boundary element method - BEM - in the discretization of the plates, while the linear elements wil be formulated through the finite element method - FEM. The aim is to contribute with a number of works related to this subject, specially in the consideration of the effect of the stiffeners eccentricity in relation to the plates neutral surface, in addition to its bending state. The tool adopted to fulfill the coupling among these kinds of structural elements is the well-known sub region or multi-domain technique, which works well with the static condensation technique for solving the sparse system of equation generated.
Zhao, Tao. "Investigation of landslide-induced debris flows by the DEM and CFD." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:316cb3fc-dfc6-4e5a-bc0d-298e298c9c5b.
Full textNieweglowski, Krzysztof, and Karlheinz Bock. "Assembly of optical transceivers for board-level optical interconnects." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A35102.
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