Дисертації з теми "Rotating cone"
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Tham, K. M. "Flow and heat transfer in a H.P. compressor drive cone cavity." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270356.
Повний текст джерелаChen, Shufei. "Markerless Lung Tumor Trajectory Estimation from Rotating Cone Beam Computed Tomography Projections." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4439.
Повний текст джерелаMay, Nicholas Edward. "Prediction of the flow and heat transfer between a rotating and a stationary cone." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/1276.
Повний текст джерелаTelford, Rosie. "Three dimensional simulations of rotating core collapse supernovae." Thesis, University of Leicester, 2005. http://hdl.handle.net/2381/30693.
Повний текст джерелаCoffey, Paul Anthony. "The influence of topography upon rotating magnetoconvection." Thesis, University of Newcastle Upon Tyne, 1996. http://hdl.handle.net/10443/1572.
Повний текст джерелаFraser, Samuel Carroll. "Prediction of thin films obliquely deposited in rotating recessed cones." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/9340.
Повний текст джерелаChatzopoulos, E., Sean M. Couch, W. David Arnett, and F. X. Timmes. "CONVECTIVE PROPERTIES OF ROTATING TWO-DIMENSIONAL CORE-COLLAPSE SUPERNOVA PROGENITORS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621238.
Повний текст джерелаGaillard, Thomas. "Étude numérique du fonctionnement d’un moteur à détonation rotative." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC011/document.
Повний текст джерелаThis thesis pertains to the domain of numerical simulation for propulsion applications. The rotating detonation engine (RDE) appears to be a good candidate to replace our current means of propulsion thanks to the increase of the thermodynamic efficiency. To preserve the advantage given by the detonation mode, the injector must provide the best possible mixing of the propellants together with acceptable total pressure losses. This numerical study deals with developing and optimizing an injector adapted to the operation of a RDE. Injection of gaseous H2 and O2 at stoichiometric ratio is considered to be suitable for rocket propulsion application. The first goal is to propose an efficient injector design so that the mixing between the propellants is maximized. The second goal is to perform simulations of the mixing process in the chamber by LES (Large Eddy Simulation) computations. The third goal consists in computing the propagation of a rotating detonation (RD) fed by different injectors in premixed and separate regimes. This study allows the comparison of two injection elements. The first one uses the principle of semi-impinging jets of H2 and O2. The second one represents an improved configuration. RD simulations with both injectors provide similar results when premixed injection is considered. The part of the injected mixture that burns by deflagration is 30% and the detonation velocity remains close the theoretical CJ velocity. In the regime of separate injection of H2 and O2, the improved injector enables to keep a high mixing efficiency in the chamber whereas the semi-impingement injector produces a strong stratification of the propellants in the chamber. As a consequence, the detonation velocity is close to the CJ velocity with the improved injector and limited to 80% of the CJ velocity with the semi-impingement injector
Seyed-Mahmoud, Behnam. "Elliptical instability in rotating ellipsoidal fluid shells applications to the earth's fluid core /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0004/NQ43451.pdf.
Повний текст джерелаBergman, Michael I. (Michael Ira). "Magnetohydrodynamics of the Earth's core : 1) steady, rotating magnetoconvection 2) magnetic Rossby waves." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/51501.
Повний текст джерелаTowers, Paul David. "The stability and transition of the compressible boundary-layer flow over broad rotating cones." Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/28219.
Повний текст джерелаPONSONNAILLE, OLIVIER. "Ecoulement permanent d'un fluide incompressible entre deux cones solidaires en rotation." Paris 11, 1997. http://www.theses.fr/1997PA112345.
Повний текст джерелаIsse, Takehi. "Regional differences of the anisotropy and differential rotation of the inner core." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150377.
Повний текст джерелаFleming, Devinna Danielle, and Devinna Danielle Fleming. "Faraday Rotation in Magnetic Ionic Liquids for Liquid Core Optical In-Line Isolator Applications." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/623082.
Повний текст джерелаРазаві, Сейед Фаршад. "Гідродинамічні особливості потока аномально-в'язких рідин у конічної поверхні ковзання". Doctoral thesis, Київ, 2019. https://ela.kpi.ua/handle/123456789/29180.
Повний текст джерелаSimard, Guy. "La modélisation de la combustion dans un four de calcination de coke de pétrole /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1992. http://theses.uqac.ca.
Повний текст джерелаReshef, Aymeric. "Dual-rotation C-arm cone-beam tomographic acquisition and reconstruction frameworks for low-contrast detection in brain soft-tissue imaging." Electronic Thesis or Diss., Paris, ENST, 2018. http://www.theses.fr/2018ENST0044.
Повний текст джерелаInterventional C-arm systems are real-time X-ray imaging systems, that can perform tomographic acquisitions by rotating the C-arm around the patient ; however, C-arm cone-beam computed tomography (CBCT) achieves a lower contrast resolution than diagnostic CT, which is necessary in order to benefit from the clinical information of soft tissues in the brain. We propose a new C-arm CBCT acquisition and reconstruction framework to increase low-contrast detection in brain soft-tissue imaging. In order to emulate a bow-tie filter, a dualrotation acquisition is proposed. To account for all the specificities of the dual-rotation acquisition, a dedicated iterative reconstruction algorithm is designed, that includes the ramp filter in the cost function. By switching from filtered backprojection (FBP) to backprojection-filtration (BPF) reconstruction methods, we propose an alternative, direct reconstruction method for dual-rotation acquisitions. For single-rotation acquisitions, the method ensures to perform as good as FBP with arbitrarily coarse angular sampling in planar geometries, and provides a different approximation from the Feldkamp-Davis-Kress (FDK) algorithm in the cone-beam geometry. Although we used it to emulate a virtual bow-tie, our dual-rotation acquisition framework is intrinsically related to region-of-interest (ROI) imaging through the truncated acquisition. With few or no modification of the proposed reconstruction methods, we successfully addressed the problem of ROI imaging in the context of dual-rotation acquisitions
Zou, Congming. "SOIL MANAGEMENT AND NITROGEN DYNAMICS IN BURLEY TOBACCO ROTATIONS." UKnowledge, 2015. http://uknowledge.uky.edu/pss_etds/64.
Повний текст джерелаFrennessen, Sebastian. "A comparison of peak trunk rotational power and club head speed in elite golf players." Thesis, Högskolan i Halmstad, Bio- och miljösystemforskning (BLESS), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31039.
Повний текст джерелаKrinchev, André Felipe Borges. "Desempenho produtivo de novilhos Nelore em pastejo rotativo de capim Marandu e capim Convert HD 364." Universidade Estadual de Londrina. Centro de Ciências Agrárias. Programa de Pós-Graduação em Ciência Animal, 2017. http://www.bibliotecadigital.uel.br/document/?code=vtls000214334.
Повний текст джерелаThe objective of this study was to evaluate the effect of Brachiaria spp. Cv. Mulato II (Convert) on performance, meat quality and carcass characteristics of Nellore steers castrated in the growing and finishing phase in rotational grazing system compared to Brachiaria brizantha cv. Marandu, under the same conditions. The experiment was conducted at the Figueira´s Farm and Experimental Station Hildegard Georgina Von Pritzelwitz, located in the municipality of Londrina and owned by the Foundation for Agrarian Studies Luiz de Queiroz. The experimental area was divided into two treatments (Marandu X Convert) with 20 hectares each, divided in four replications by treatment, with five paddocks of one hectare each. The animals were managed according to the dry matter of leaf blades offer (6,19% of body weight) in rotational grazing with 7 days of occupation and 28 days of rest. Ten animals were used in each replicate (testers), as well as regulatory animals when necessary. For performance analysis, the 10 animals of each replicate were used, while for carcass and meat analyzes six animals were used per replicate. Production and bromatological characteristics of the two grasses were evaluated. The experimental design was completely randomized with two treatments and four replicates, the data were submitted to the analysis of variance using the R statistic program. Animals fed on pastures established with Convert grass were superior than those fed on pastures established with Marandu grass, with higher average daily gain during the experimental period (0,682 kg X 0,605 kg), slaughter weight (470,45 kg X 451,43 kg), hot carcass weight (239,93 kg X 232,36 kg). They were also superior in relation to meat color values. For the variables yield of cuts (muscle, fat and bone), fat thickness, rib eye area, muscle lenght, finishing, conformation, shear force, marbling, final pH, pressure water loss and centesimal (dry matter, crude protein , ether extract and ash) there was no significant difference between the treatments. Therefore, the better bromatological quality (digestibility) of the Convert grass provided better results of the animals handled in it, reflecting in better values of individual performance, carcass and meat quality.
Lebas, Étienne. "Étude et modélisation de la pyrolyse du charbon en four tournant." Vandoeuvre-les-Nancy, INPL, 1995. http://docnum.univ-lorraine.fr/public/INPL_T_1995_LEBAS_E.pdf.
Повний текст джерелаCamela, Edoardo. "The growing importance of the ETF industry: the pros and cons of passive management." reponame:Repositório Institucional do FGV, 2015. http://hdl.handle.net/10438/14168.
Повний текст джерелаApproved for entry into archive by Ana Luiza Holme (ana.holme@fgv.br) on 2015-10-27T11:35:59Z (GMT) No. of bitstreams: 1 Thesis ECamela - Final - FGV to send.pdf: 1456172 bytes, checksum: da94c4812346c85c989edfe869e72519 (MD5)
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The aim of this project is the comparison between the pros and cons of passive and active management by conducting a statistical study of several strategies through Exchange-Traded Funds. In particular, the examination will go through the most passive strategy, namely buy & hold, to a different degree of active indexing management such as sector and/or asset class rotations based on bottom-up, top-down and technical indicators. The analysis show that active strategies, if properly implemented, obtain risk-adjusted returns substantially higher than a passive approach, overcoming the issues of transaction costs and diversification which are typically claimed by a passive management.
O objectivo deste projecto é a comparação entre os prós e contras de gestão passiva e ativa através da realização de um estudo estatístico de várias estratégias através dos Exchange-Traded Funds. Em particular, a análise vai passar pela estratégia mais passiva, ou seja, buy and hold, para um grau diferente de active indexing management, tais como rotações do sector e / ou classe de ativos com base no bottom-up, top-down e indicadores técnicos. A análise mostra que as estratégias ativas, se forem devidamente aplicadas, conseguem obter retornos ajustados ao risco substancialmente superiores quando comparados com uma abordagem passiva, superando as questões de custos de transação e diversificação que normalmente são reivindicadas por uma gestão passiva.
FRANÇA, Ulysses Eugênio Duarte de. "Simulação do processo de calcinação de gipsita em forno rotativo com aquecimento indireto." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18555.
Повний текст джерелаMade available in DSpace on 2017-04-12T16:58:50Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação_Ulysses.pdf: 2292611 bytes, checksum: 94f0d93357c24023b30a73414786b32e (MD5) Previous issue date: 2016-01-29
CAPES
O processo de obtenção do gesso beta, que consiste na desidratação do minério da gipsita a uma temperatura entre 125 °C e 160°C, é realizado em fornos rotativos através de queima direta ou indireta. Os principais combustíveis utilizados neste processo no Polo Gesseiro do Araripe são a lenha, o coque de petróleo, o óleo BPF e gás natural. Esta dissertação estuda a modelagem matemática de um sistema de calcinação com aquecimento indireto utilizando dois combustíveis sólidos diferentes: a lenha e o coque de petróleo. A modelagem é feita por meio do Método dos Volumes Finitos em um modelo bidimensional de coordenadas cilíndricas. Através da simulação numérica é possível prever o perfil de temperatura em uma seção transversal do forno, tal como suas taxas de aquecimento. São observadas as influências de parâmetros como vazão mássica do combustível, percentual de excesso de ar na combustão e teor de umidade da lenha. Também é realizada uma comparação entre os processos utilizando a lenha e o coque com relação ao custo e à emissão de dióxido de enxofre (SO2).
The process of obtaining the beta plaster, which consists of dehydration of the gypsum ore under a temperature between 100°C and 160 °C, is performed in rotary kilns through direct or indirect burn. The main fuels utilized in this process at Araripe Gypsum District are firewood, petroleum coke, heavy fuel oil and natural gas. This dissertation studies the mathematical modeling of a calcination system with indirect heating using two different solid fuels: firewood and petroleum coke. The modeling is made by using the Finite Volume Method in a two-dimensional model of cylindrical coordinates. Through the simulation is possible to predict the temperature behavior in a cross section of the kiln, as well as its heating rates. It was analyzed the influence of parameter such as mass flow rate, percent excess combustion air and moisture content of the firewood. A comparison between the processes using firewood and coke is also conducted, concerning the cost and the sulfur dioxide (SO2) emission.
Olsson, Malin. "Core endurance and correlation to spinal rotation mobility and hand grip strength in female horseback riders and soccer players." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-42363.
Повний текст джерелаBackground: Core stability is necessary to keep balance and enables force to be transmitted through the body. This makes core stability important in everyday chores, sport performance and to reduce risk of injuries. A better understanding of the core stability in different sports can develop athletes training programs, not only to improve the core stability itself, but also to improve overall performance. Aim: The aim of this study was to examine the differences in core endurance between young female horseback riders and soccer players, and the core endurance association with hand grip strength and spinal rotation mobility. Methods: The McGill’s core endurance test was used to examine the core endurance between female horseback riders (n = 10) and soccer players (n = 10), age 16-20. The hand grip strength was examined with a hand grip dynamometer and was used to get an indication of overall body strength. The spinal rotation mobility was examined with a Myrin goniometer. Shapiro-Wilks was used to confirm the normality of the data. Independent sample t-test was used to compare core endurance time (sec.) between the horseback riders and the soccer players. The significant level was set at < 0.05. A strength ratio was calculated (kg/kg body weight), and the Pearson’s correlation coefficient was used for examining the association to core endurance (sec.). Pearson’s correlation coefficient was also used to examine the association between the spinal rotation mobility (°) and core endurance (sec.). High correlations were set at r > (0.7), moderate when r = (0.3- 0.7) and low when r < (0.3). Results: The result showed that horseback riders had better endurance in the trunk extensor test than the soccer players (p = 0.006). Hand grip strength showed moderate correlation with the endurance time of the trunk extensor test (r = 0.631, r² = 0.398), and with the lateral flexor tests (r = 0.411, r² = 0.169; r = 0.615, r² = 0.378). Low correlation was shown with the trunk flexor test (r = 0.197, r² = 0.039). The spinal rotation mobility test showed low correlation with all the core endurance tests (r >0.3). Conclusion: The results indicates few differences between the horseback riders and the soccer players, which is not enough to draw a conclusion. The correlation between hand grip strength and the core endurance tests indicates that a better core stability might be associated to an increased overall body strength.
Watkins, Andrew. "Earth Rotation and Deformation Signals Caused by Deep Earth Processes." Bowling Green State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1510767104519046.
Повний текст джерелаRogister, Yves. "Modes normaux de modèles de Terre en rotation." Habilitation à diriger des recherches, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00773648.
Повний текст джерелаMarchini, Monikelly do Carmo Nascimento 1986. "Influência do grau de rotação do aparelho e do crânio na espessura da cortical óssea em imagens de tomografia de feixe cônico : Evaluation of the influence of the unit and skull rotation on cortical bone thickness in cone beam computed tomography images." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290162.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A tomografia computadorizada de feixe cônico (TCFC) tem sido uma ferramenta de auxílio no diagnóstico, com várias aplicações clínicas. Devido ao aumento das diversas possibilidades de aquisição da imagem, há uma grande necessidade de um constante ajuste da imagem para cada proposta de diagnóstico. A avaliação da cortical óssea é importante para os casos de planejamento de implante imediato e para os casos em que há a necessidade de movimentação ortodôntica extensa. Entretanto, alguns fatores de qualidade de imagem devem ser considerados para uma acurada visualização da cortical óssea. Assim, com o presente estudo avaliou a influência do grau de rotação do aparelho, 3600 e 1800, bem como a influência de diferentes posições do crânio na avaliação da espessura da cortical óssea em imagens de TCFC. Para tanto, foram utilizados 11 crânios de humanos nos quais foram selecionados 59 dentes da maxila e mandíbula para avaliação de suas corticais ósseas. As imagens foram adquiridas no aparelho de TCFC Accuitomo 170, com voxel de 0,16mm, em quatro diferentes aspectos com relação à rotação do aparelho e posição do crânio respectivamente (protocolo 1: 3600/00; protocolo 2: 1800/00; protocolo 3: 1800/900; protocolo 4: 1800/1800). Para a avaliação das imagens, a cortical óssea foi classificada em três grupos de acordo com a condição ou espessura (cortical ausente, cortical fina e cortical espessa). No total 472 imagens bidimensionais (2D), referentes a cortes sagitais, foram avaliadas por três radiologistas previamente calibrados. Para concordância intra e interobservador foi utilizado o teste kappa e para avaliação das espessuras das corticais ósseas em relação ao real e entre os diferentes tipos de imagem foi utilizado o teste de Wilcoxon Signed Ranks. O teste de Kappa ponderado foi utilizado para comparar as diferentes condições da espessura óssea nos quatro protocolos de imagem. O nível de significância estabelecido foi de 95% (?=0,05). Os resultados obtidos mostraram que a concordância intraobservador variou de quase perfeita (k=0,87) a moderada (k=0,50) e a concordância interobservador variou de substancial (k=0,79) a moderada (k=0,56). De acordo com os resultados obtidos, observou-se que apenas para o protocolo 1 na região da cortical lingual, não houve diferença estatística entre as imagens e o padrão-ouro. Quando avaliando a cortical lingual, os maiores valores de concordância foram observados no protocolo 3, quando esta era ausente (k=0,80) e fina (k=0,47), já para cortical lingual espessa, o mais concordante foi o protocolo 2 (k=0,60). Avaliando-se somente a cortical vestibular, quando esta era ausente, o protocolo 3 exibiu o maior valor de concordância (k=0,61), enquanto que o protocolo 4 foi o mais concordante para cortical vestibular fina (k=0,38) e o protocolo 2 para a cortical vestibular espessa (k=0,40). Concluiu-se que o diagnóstico da espessura da cortical óssea não apresenta concordância perfeita com as imagens de TCFC, exceto para a região da cortical lingual no protocolo 1. Houve uma maior dificuldade de diagnóstico para a cortical vestibular em relação a lingual. Além disso, quando a espessura é mais fina, mais difícil é o diagnóstico
Abstract: The cone beam computed tomography (CBCT) has been a complement tool in diagnosis of many clinical applications. Due to the increase of the various possibilities of imaging, there is a great need for an image adjustment for each proposal to be diagnosed. The evaluation of cortical bone is important for implants pos-extraction placement and in cases requiring extensive orthodontic movement. However, some factors of image quality should be considered for accurate visualization of cortical bone. Thus, this study aimed to evaluate the influence of the arc rotation (3600 and 1800), and the influence of different positions of the skull to assess the thickness of buccal and lingual cortical bone in CBCT images. For this, 59 teeth of 11 human skulls in both arcs were selected. Images were made on Accuitomo 170 CBCT. The voxel size used was 0.16 mm. Four different aspects of image regarding the rotation of the device and position of the skull were made respectively (protocol 1: 3600/00; protocol 2: 1800/00; protocol 3: 1800/900; protocol 4: 1800/1800). For evaluation of the images, the cortical bone was classified into three groups according to the condition or the thickness (absent cortical, thin cortical, and thick cortical). A total of 472 two-dimensional images (2D) in sagittal sections were evaluated by three radiologists previously calibrated. For intra- and interobserver agreement kappa test was used. Wilcoxon Signed Ranks test was used to assess the cortical bone thickness compared to the gold standard and among different protocols. Ponderate Kappa test was used to compare conditions of cortical bone among protocols. The significance level was set at 95% (?=0.05). The results showed that the intraobserver agreement ranged from almost perfect (k=0.87) to moderate (k=0.50) and interobserver agreement ranged from substantial (k=0.79) to moderate (k=0.56). According to the results obtained, the protocol 1 showed that no statistical difference between the images and the gold standard was found only in lingual cortical bone region. When evaluating lingual cortical, higher reliability values was found with protocol 3 for absent (k=0.80) and thin (k=0.47), while for thick cortical in lingual side, the more consistent was the protocol 2 (k=0.60). Evaluating only buccal cortical side, the protocol 3 obtained the best agreement value for absent, (k=0.61), while the protocol 4 was better for thin cortical in buccal side (k=0.38), and protocol 2 for thick cortical in buccal side (k=0.40). It was concluded that the diagnosis of cortical bone thickness do not show agreement with CBCT images, except for lingual cortical bone in the protocol 1. There was more difficult diagnosis in buccal cortical compared to lingual cortical side. In addition, when the thickness is thinner more difficult the diagnosis is
Doutorado
Radiologia Odontologica
Doutora em Radiologia Odontológica
Chen, Chun-Ming. "Data Summarization for Large Time-varying Flow Visualization and Analysis." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469141137.
Повний текст джерелаAquino, João José Redondo de. "Structural numerical simulation code development with isogeometric anakysis (IGA)." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22375.
Повний текст джерелаIn the present day most product development industries uses the Finite Element Method (FEM) for structural analysis. Designers model the product geometries using Computer-Aided Design (CAD) software, the geometries are then fitted for analysis, by the analysts, with a mesh approximation that inevitably results in loss of accuracy. Achieving the best geometry description for complex components can be a complex task and it can take a lot of time. Considering this drawback, a new method was developed which takes advantages of curve representation tools and uses them as bases for analysis. Aiming for no loss of geometrical precision, this new method has been called "Isogeometric Analysis" (IGA). The smoothness of Spline representations used in Isogeometric Analysis can be useful for a particular branch of structural analysis which is the analysis of plates and shells. The classic thin plate theory developed by Gustav Kirchhoff requires a geometry description with C1 continuity between elements which is normally defined by high order polynomial functions, which typically represents a problem with the piecewise Lagrangian shape functions used in conventional FEM. The present work explores parametric descriptions used as basis for Isogeometric Analysis, such as Bézier curves, B-splines and NURBS, taking advantage of its smoothness to develop formulations for thin plate elements. The 4-node rectangular derived by Melosh, O. Zienkiewicz and Y. Chung called MCZ thin plate element based on Kirchhoff assumptions, was the starting point to build up to a NURBS-based thin plate element. MCZ thin plate elements, NURBS-based thin plate elements (with different order geometries) and Abaqus commercial software shell elements are evaluated by means of classical plate benchmarks comparing the elements convergences and overall performance. It can be shown that the proposed NURBS-based formulation is reliable for the analysis of thin structures.
Nos dias de hoje a maioria da indústria de desenvolvimento do produto utiliza o Método dos Elementos Finitos (MEF) na análise estrutural. Os desenhistas modelam o produto através de ferramentas de Computer-Aided Design (CAD). As geometrias são depois ajustadas para a análise pelos analistas que constroem uma aproximação através de uma malha de elementos finitos, o que inevitavelmente resulta numa perda de precisão geométrica. Para conseguir a melhor aproximação à geometria original para componentes complexos o processo pode ser complicado e pode consumir muito tempo. Considerando esta desvantagem foi desenvolvido um novo método que tira partido da descrição geométrica das ferramentas de desenho e utiliza as funções base das curvas para analise, com o objectivo de não haver perda de precisão geométrica, este novo método tem o nome de “Análise Isogeométrica” (IGA). A suavidade das geometrias Splines usadas na análise isogeometrica pode ser muito útil num ramo particular da análise estrutural, no estudo das placas e cascas. A teoria clássica de análise de placas finas de Kirchhoff requer uma descrição geométrica que tenha continuidade C1 entre elementos, que é normalmente definida por polinómios de ordem elevada, que são tipicamente um problema para as funções de forma Lagrangeanas usadas em MEF. O presente trabalho explora as descrições geométricas utilizadas como funções de forma para a análise isogeométrica como as curvas de Bézier, as B-splines e as NURBS, tirando vantagem da facilidade de estas conseguirem a requerida continuidade entre elementos para criar elementos de placas finas com as funções de base NURBS como funções de forma. É utilizado o elemento de placa fina MCZ desenvolvido por Melosh, O. Zienkiewicz e Y. Chung com base nas premissas de Kirchhoff como ponto de partida para desenvolver o elemento com base em NURBS. No fim os elementos de placas finas MCZ, os elementos com funções de base NURBS (com geometrias de diferentes ordens) e elementos do tipo casca do software comercial Abaqus são avaliados através de uma série de diferentes problemas clássicos de placas, comparando a convergência e o desempenho global. É possivel ver que a formulação proposta é fidedigna na análise de estruturas de placa fina.
Pichon, Guillaume. "Dynamique rotationnelle couplée de la dérive géomagnétique vers l'ouest et de la super-rotation de la graine terrestre." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC271/document.
Повний текст джерелаThis PhD work focuses on the rotational dynamics of the coupled inner core - outercore - mantle system. The conservation of the angular momentum our coupled Earth model indeed involves two direct electromagnetic torques at the fluid core boundaries and a remote gravitational torque between the inner core and the mantle. The rotational dynamics is described by four typical shears and studied in convective numerical simulations of the geodynamo which are able to reproduce the main characteristics of the geomagnetic field and its secular variation. This secular variation is mainly embodied by the westward drift of magnetic flux patches at the CMB, concentrated on the equator of the Atlantic hemisphere, and is well documented for the last four centuries. We provide constrains on the inner core differential rotation by expressing its link to the geomagnetic westward drift. This is performed through the formulation and the validation of dynamical electromagnetic torque models, which are then introduced in the conservation of the angular momentum of the system. In the long-term state, the global shear in the fluid outer core is distributed between the westward drift and the differential rotation of the inner core, in proportions controlled by the state of couplings. As a present day estimate of this shear is close to the observed westward drift, we conclude there is no differential rotation of the inner core on time-average. In the time-dependent state, we observed that the strength of gravitational coupling is the dominant parameter. This places limit on the decadal fluctuations of the inner core differential rotation, which should not exceed a few hundredths of degree per year
Lubrano, Jean-Louis. "Etude théorique de la turbulence homogène soumise à des effets de rotation et modélisation en vue de l'implantation au sein d'un code résolvant les équations de Navier-Strokes." Ecully, Ecole centrale de Lyon, 1993. http://bibli.ec-lyon.fr/exl-doc/TH_T1482_jllubrano.pdf.
Повний текст джерелаDumitriu, Dan. "Modélisation dynamique des systèmes articulés par des vecteurs translation et des matrices rotation : prise en compte des rigidités par des multiplicateurs de Lagrange : simulations du mouvement à l'aide d'un code en C++." Poitiers, 2003. http://www.theses.fr/2003POIT2258.
Повний текст джерелаOur proposal for dynamical modelling of articulated systems consists in parameterising the position of each solid by the 3 components of its translation vector and the 9 components of its rotation matrix. The rigidities of each solid and the articulations between solids are taken into account by Lagrange multipliers. The motion is governed by an algebra-differential system bringing together constraint equations and Lagrange equations. We have created an oriented object C++ program solving the algebra-differential system by a projection algorithm. This program is validated by simulating the motion of a platform. For the Euler-Lagrange solid, the Lagrange multipliers associated to the solid rigidity are grouped together in a 3x3 symmetrical matrix turning out to be negative. Moreover the eigenvalues of this matrix are constant. The Lagrange multipliers matrix is directly related to the stress tensor volume average
Legros, Hilaire. "Sur quelques problemes de dynamique planetaire." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13173.
Повний текст джерелаGodard, Paul. "Parallélisation et passage à l'échelle durable d'une chaïne de traitement graphique pour l'impression professionnelle." Thesis, Strasbourg, 2019. https://publication-theses.unistra.fr/public/theses_doctorat/2019/Godard_Paul_2019_ED269.pdf.
Повний текст джерелаThe strong and continuous improvements in the professional printing field have led to the ubiquity of printed objects in our daily life. The flexibility introduced by the digital printing process promises to associate extensive customization with mass production. The quick growth of printing usages and technologies, illustrated by wider printer farms and faster digital presses, leads to original challenges for the computer system in charge of driving them. In this thesis, we explore new approaches inspired by the high performance computing field to speedup the graphics processing necessary to digital printing. To achieve this goal, we introduce a distributed system which provides the adequate flexibility and performance by exploiting and optimizing both processing and synchronization techniques. We present our architecture up to the subtle parts of its implementation which allows our solution to meet the specific constraints on generating streams for printing purpose. We perform a complete evaluation of our solution and provide experimental evidence of its great performance and viability
Andersson, Josefin, and Sandra Lidholm. "Revisorsrotation : Rotationsreglernas påverkan på revisorns oberoende, revisionskvalitet samt revisorns legitimitet." Thesis, Högskolan i Skövde, Institutionen för handel och företagande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-17161.
Повний текст джерелаBackground: Research has shown both advantages and disadvantages of rotation rules for auditors. Some argue that the auditor's independence and the audit quality are strengthened in connection with rotation rules, since the auditor does not get a close relationship with clients. At the same time, other researchers indicate that the auditor's independence and the audit quality will deteriorate when rotation rules are applied. An auditor must, regardless of assignment, always revise on the basis of good auditing practice and always be independent in the assignments. Research indicates that the auditor's independence is seen as a professional asset, if an auditor acts negligently, this would affect the auditor's legitimacy, and confidence in auditors can thus be questioned by society. Questions: What impact does rotation rules have on the auditor's independence? What impact does rotation rules have on the audit quality? Purpose: The purpose of the study is to contribute, from a legitimacy perspective, the perceptions of auditors on the impact of the rotation rules on the auditor's independence and the audit quality. The study will also contribute with an understanding of how the relationship between auditor and client affects the auditor's independence and the audit quality. When it is the relationship being studied, the friendship threat within the statutory analysis model will be described. Method: Seven interviews with authorized auditors in small or medium-sized auditing firms have been conducted. The interviewed auditors have been chosen through a strategic selection to contribute with understanding of the chosen area. Results and conclusion: The study shows that rotation rules do not affect the auditor's independence in fact, but that it affects the auditor's independence in appearance, which strengthens society's confidence in auditors. Rotational rules can also improve the audit quality as an auditor who has had an assignment for several years can carry out the auditing by routine and not be attentive enough. However, the study's results suggest that rotation rules may impair the audit quality during the first year of an assignment because an auditor should have knowledge of the client's activities in order to perform the audit with high quality.
Patias, Josiele. "Zoneamento geotécnico com base em krigagem ordinária e equações multiquádricas: barragem de Itaipu." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/18/18132/tde-06122011-111314/.
Повний текст джерелаThis thesis presents a study based on the zoning of geotechnical parameters resulting from core boring, carried out in the basaltic bedrock located in the area of the Itaipu Hydroelectric Power Plant (Foz do Iguaçu - PR). These zonings were carried out based on the interpolation of the data by means of ordinary kriging and multiquadric equations. The data provided by core boring analyzed in this research are: Rock Quality Designation (RDQ), degree of alteration, degree of consistency and degree of fracturing. The interpolation methods were evaluated for the RQD parameter, since such methods present similar mathematical characteristics; therefore, comparisons were made between interpolations resulting from ordinary kriging and multiquadric equations, demonstrating the similarity of these methods with real data. In this manner, the remaining parameters due to being categorized as categorical variables and, therefore, discrete, and presenting complexity for the execution of the variographic analysis of the data (experimental semi-variogram and modeling of the semi-variogram), were interpolated only by the method of the multiquadric equations. The validation of the interpolated data was carried out on the basis of a case study relating to the hydrogeotechnical behavior of the bedrock mass, which is monitored by standpipe piezometers. This validation showed that the methods employed to obtain the zonings and the modeling parameters chosen were adequate, since a high correlation was verified between the behavior trends obtained by the interpolations of the geotechnical parameters of the bedrock mass and the behavior revealed by the set of piezometers installed in the same site. The primordial stage of this job was the acquisition of historical data relating to the geological-geotechnical investigations in the area of Itaipu Dam. This data served as a starting point for the composition of an interactive map showing the location of the different types of investigations carried out in the rock and earthen masses. The resulting document permit a rapid and dynamic search through the geotechnical information, since it presents as its reference the plan view of the Itaipu dam itself. Each point of investigation is linked to the geotechnical profile. The investigations utilized in this map are: core boring, standard penetration test (SPT), cone penetration test (CPT) and manual pit. In this manner, the recovery of the historical information obtained by the geotechnical investigation the Itaipu Dam area resulted in data compilations in digital format, based upon which, a set of tabular forms was obtained of a type capable of being utilized in different Systems of Geographical Information and of interpolation of geo-referenced data.
Jedlička, Michal. "Statická analýza pohyblivé výškové budovy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372265.
Повний текст джерелаKazaz, Ilker. "Dynamic Characteristics And Performance Assessment Of Reinforced Concrete Structural Walls." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611712/index.pdf.
Повний текст джерелаOzgur, Cagri. "Influence of cross-frame detailing on curved and skewed steel I-girder bridges." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42769.
Повний текст джерелаWu, Hung-Sheng, and 吳鴻昇. "Convection heat transfer from the surface of a non-isothermal rotating cone." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/68215262844246332311.
Повний текст джерела逢甲大學
機械工程學系
89
Heat transfer of laminar mixed convection from a non-isothermal rotating cone is studied numerically. Results show that the Prandtl number and the surface temperature differences between the surface and the ambient air, i.e., , are vital to the velocity and the temperature field, it also reveals that the momentum transfer rate is comparable to the heat transfer rate at Pr=0.7, and heat transfer rate becomes greater than momentum transfer rate as increasing of the Prandtl number. Results also indicate that the Nusselt number decrease with increasing of ξ in the free convection dominate region (ξ< 0.4), it implies heat transfer rate suppressed by the cone rotation. While the Nusselt number increase with increasing of ξ and Pr in the region where forced convection dominated (ξ> 0.6), it means the forced convective heat transfer enhanced by the faster rotative motion and the higher Pr. Especially for the rotating cone with Pr=10 and m=-2, the colder air flows downward to repel the hotter air from the cone surface which tend to assist the heat transfer, as a result, the forced convection enhanced significantly under this condition.
Lai, Yung-Ta, and 賴泳達. "Index Modulation Multiple Access with Rotation Code." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/nwpcq7.
Повний текст джерела國立清華大學
電機工程學系
107
In the fifth generation (5G) communication system, massive connectivity of users and devices, higher spectral efficiency (SE), higher energy efficiency (EE), better link reliability and lower latency are expected. Since the current LTE system that uses the Orthogonal Frequency Division Multiple Access (OFDMA) technique is less efficient to meet these requirements, one of the most popular solutions for 5G is non-orthogonal multiple access (NOMA) technique. However, most current code-domain NOMA solutions require user-specific codebook assignment, which require grant based transmission. Therefore, the motivation is to design a code-domain NOMA scheme that can facilitate grant free random multiple access. In this thesis, the “Index Modulation Multiple Access”(IMMA) scheme is proposed. IMMA is a codebook-based NOMA scheme that is inspired from the index modulation (IM) technique. To be specific, IMMA uses the active subcarriers and inactive subcarriers to make index indices, and the index indices can carry index bits in addition to the modulation signal bits. By adjusting different active subcarrier numbers and modulation types, the IMMA can reconfig and improve the spectral efficiency (SE) and energy efficiency (EE). The rotation code is proposed to resolve the inter-user interference (IUI) in contention based multiple access. Furthermore, different decoders such as the breath-first search sphere decoder (BFS-SD) and depth-first search sphere decoder (DFS-SD) are proposed to relieve the high computational complexity of the joint maximum likelihood (JML) decoder, the theoretical average bit error rate (ABER) upper bound is also derived. Our simulation results show that the BER of IMMA is improved with rotation code for better diversity. The SE and EE of IMMA are also better than OFDMA and sparse code multiple access (SCMA). In brief, we design a code-domain NOMA scheme that can facilitate grant free random multiple access, and has better SE, EE than OFDMA and SCMA.
Seyed-Mahmoud, Behnam. "Wobble/nutation of a rotating ellipsoidal earth with liquid outer core : implementation of a new set of equations describing dynamics of rotating fluids /." 1994. http://collections.mun.ca/u?/theses,98622.
Повний текст джерела"Analise termica de um regenerador rotativo." Tese, Biblioteca Digital da Unicamp, 2005. http://libdigi.unicamp.br/document/?code=vtls000377023.
Повний текст джерелаVeasey, Martin James. "The effects of core-mantle gravitational coupling on the rotational dynamics of Mercury." Master's thesis, 2010. http://hdl.handle.net/10048/1521.
Повний текст джерелаGeophysics
Akiyama, Shizuka. "The role of rotation and magnetic fields in a core collapse supernova." Thesis, 2006. http://hdl.handle.net/2152/20984.
Повний текст джерелаtext
Chih-LunLiu and 劉誌倫. "Parallelized Rotation-Scaling-Translation-Invariant Template Matching on Embedded Multi-Core Platform." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/rj92gu.
Повний текст джерела"Estudo do comportamento energetico apresentado por tres formas geometricas de laminas de enxada rotativa." Tese, Biblioteca Digital da Unicamp, 1997. http://libdigi.unicamp.br/document/?code=vtls000121238.
Повний текст джерелаSUNG, YI, and 宋懿. "Effect of Eight Weeks Core Stability Training Combine Rotation Training on College Baseball Player’s Hitting Performance." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9mkn8f.
Повний текст джерела國立體育大學
運動保健學系
107
Hitting is one of the key factors in the impact of a baseball game. When hiting, the trunk should be stabilized first, then use the lower limb strength to drive the waist to rotate, and connect to the upper limb to complete the swing action. The trunk core muscles play an important role in conacting the lower limbs to the upper limbs, so the intervention of the core muscle training may affect the hitting performance. Purpose: This study will explore the impact of eight-week core stability and rotational training interventions on the performance of college players. Methods: 24 general college baseball players, test the Double-Leg-Lowering-Test (core stability), dynamic abdominal, back muscle ability and medicine ball throwing (rotation ability), as a core ability index; measuring swing speed and ball exit velocity(BEV) as performance indicator. Two-way Anova was used to compare the difference between the core stability and rotation training before and after intervention, and between the control group and the experimental group, in terms of swing speed, ball exit velocity, core muscle capacity and rotation ability. The statistically significant level was determined to be α < 0.05. Results: The control group and the experimental group had significant progress in core stability, dynamic abdominal muscle and dynamic back muscle capacity. There was no significant improvement in the rotation ability of the control group, while the experimental group and the experimental group both improved the swing speed and the ball exit velocity, but did not reach a statistically significant difference. Conclusion: In the core muscle capacity, regardless of the control group or the experimental group is improved, and the improvement of core muscle capacity can also reduce the risk of injury. Both the experimental group and the control group have made progress in both the swing speed and the ball exit velocity. Although there is no significant difference in statistics, the performance of the hitting has improved. Therefore, in the future, if the coach or the player wants to improve the two hitting performance of the swing speed and the ball exit velocity of hitting, the core stability training and the rotation training, such as the medicine rotation training, can be added to the practice, which can help the performance.
"Caracterização fisica e secagem do acido 2-hidroxibenzoico em leito fluidizado agitado mecanicamente em leito fluidizado pulsado rotativo." Tese, Biblioteca Digital da Unicamp, 2003. http://libdigi.unicamp.br/document/?code=vtls000300920.
Повний текст джерелаCHOU, CHUN-CHUAN, and 周淳娟. "To Explore the Feasibility of the Position Deviation Conversion between Rotation Axis and Translational Axis in Cone-Beam Computerized Tomography for Breast Cancer Patients." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/snahm8.
Повний текст джерела中臺科技大學
醫學影像暨放射科學系暨研究所
107
According to the formula in converting the rotation axis and translation axis into the translation axis, the data from the cone-beam computed tomography (CBCT) of the breast cancer patient is retrospectively collected. Comparing the difference between the data before and after conversion and explore whether the formula can be directly applied to the patient who received breast cancer radiotherapy (RT) on the treatment couch lack of the rotation axis correction function. The CBCT data before RT for breast cancer patients were collected from January 1, 2015 to December 31, 2017. A formula published by B Sarkar et al. in March 2018 that converted the rotation axis and translation axis deviation values to the translation axis deviation values. According to the results of the data conversion, the average value of each axis in three dimensions is calculated separately, and the data difference before and after the conversion is checked using the Paired samples t-test. The CBCT values of 121 patients receiving breast RT in the X, Y, and Z axes were: -0.36±4.10, 1.60±2.92, and -1.10±2.73, in millimeter, respectively. The mean and p values before and after the three-dimensional transformation were obtained according to the conversion formula as follows: -0.38 vs 1.15, p<0.001, 1.52 vs -0.14, p <0.001, -1.11 vs 0.03, p <0.001, in mm. Dr. B Sarkars formula provided a way for the treatment couch achieve better displacement correction through the new displacement deviation values. In our study, the results are significantly different from the translational axis deviation values found in the clinical patients. It is shown that this conversion formula can not be applied to CBCT data for breast cancer patients on the treatment couch which cannot perform rotation axis correction. Further analysis and discussion in more rigorous conditions are needed.