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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
241

CHICKIPEDIA

KOOHNAVARD, SAINA January 2013 (has links)
This paper explores the fundamental meanings of deconstruction in fashion design and has the aim to investigate deconstruction in feminine ideal. It also stresses other thoughts of deconstruction in terms of philosophy through Jacques Derrida, architecture and philosopher Peter Eisenman and how deconstruction can be applied to find parallels between its setting and the setting it is compared to. Since the 1960s, deconstruction is a term that has been interpreted within many fields and traversed across different media. Influential Japanese designers have used the term in their works, juxtapositioning them to traditional Western ideas to create clear contrasts between stereotypical and categorised perception and unconventional interpretations. During the 1980s, designers such as Rei Kawakubo and Yohji Yamamoto explored the term to subsequently create a great distress in the fashion field. Their designs were examples of archetypes evoked from the past and presented as newborn strangers or dismantled ghosts. These designers investigated the mechanical functions of each archetype as they sought to find the meaning of each garment to later reinterpret its traditional essence. Also, they questioned the relationship between body and garment, raising thoughts of whether or not the bearer of the garment was personified to the garments traditional significance. The deconstructed element chosen for investigation in this project consists of a personification of the silhouette of the 1870s dress. This personification is discussed in terms of social and moral standards and constrictions as well as the political function of the dress. The fact that you could deconstruct a 1870s dress is clearly a way to take a historical archetype from its traditional meaning and place it into a new context. Similar to Jacques Derrida, the works of deconstruction in fashion design discuss our assumptions of archetypes and whether or not these archetypes can ever lack of historical or individual meaning. The constant dialogue with the past is a catalyst to reinterpret standardisations in fashion design through questioning the conformity of archetypes. / Program: Modedesignutbildningen
242

La série des Distorsions de 1933 : Une parenthèse dans l’œuvre d’André Kertész ? / The series of Distorsions by 1933 : A parenthesis in the work of André Kertész ?

Blin, Sandy 06 April 2012 (has links)
Moins connues que Chez Mondrian, ou d’autres tirages devenus célèbres, les Distorsions de 1933 peuvent apparaître comme une série d’importance mineure dans l’œuvre d’André Kertész. La série de photographies qui la composent, vaste par le nombre, donne à voir des déclinaisons de nu qui n’ont plus rien d’académique, dans le traitement qu’en donne le photographe. Les corps, déformés grâce à un miroir courbe, surprennent de par leur modernité et leur caractère d’étrangeté, au regard du reste de la production de l’auteur. Constitue-t-elle pour autant une « parenthèse » dans son œuvre ? Il convient pour y répondre de s’interroger sur le contexte d’apparition de ces photographies et les raisons de leur création. Pour ce faire, une évaluation des composantes plastiques de chacune des images s’avère incontournable, avant que d’établir des liens et correspondances avec d’autres œuvres du photographe. L’angle choisi, qui favorise le rapport direct aux images en les plaçant au centre de la recherche, s’intéresse à la mise en œuvre des Distorsions à l’aune de la commande qui en suscita l’objectivation, tout en dévoilant comment ce cadre spécifique fut outrepassé. Le dispositif complexe employé pour la prise de vue est alors questionné, dans l’intention de mesurer l’importance et le rôle du miroir dans le dévoiement de l’image. A ce moment sont abordées, par le biais d’analyses à la fois formelles et esthétiques, les diverses typologies de corps, et leur rapport à l’espace dans l’image. Ce qui aboutit enfin à une vision d’ensemble, permettant de replacer ce corpus dans l’œuvre entier de Kertész, et de dégager les parentés intentionnelles dans sa logique de création. / Less known than Chez Mondrian, or other famous prints, the Distortions of 1933 may appear as a series of minor importance in André Kertész’ work. The series of photographs, wide ranging in numbers, lets us see versions of nude, whose have nothing to do with academic, in the handling given by the photographer. Bodies, distorted by a curved mirror, surprising in their modernity and their strangeness, compared with the rest of the author production. Does it make up a "parenthesis" in his work? To respond to this question, we should wonder about the developing context of these photographs and also the reasons of their creation. An evaluation of visual aspects of each image is necessary, before establishing links and connections with other works made by the photographer. The angle chosen, which favors the direct images by placing them in the center of research focuses on the implementation of Distortions in the light of the order in which aroused objectification, while revealing how this specific framework was exceeded. The complex device used for the shooting is asked then, with the intention of measuring the importance and role of the mirror in the image’s corruption. At this time are addressed through analysis of both formal and aesthetic, the various types of bodies, and their relationship to space in the image. This leads finally to a vision, to put this body in the whole work of Kertész, and to identify the intentional similarities in his creation logic.
243

Communication in decentralized control

Teneketzis, Demosthenis January 1980 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / by Demosthenis Teneketzis. / Ph.D.
244

Percepção de dimensões corporais de adolescentes do sexo feminino: aspectos psicofísicos e comportamentais

Paula, Adriana Inês de [UNESP] 06 April 2010 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:30:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-04-06Bitstream added on 2014-06-13T19:19:36Z : No. of bitstreams: 1 paula_ai_dr_rcla.pdf: 1264548 bytes, checksum: f5f07951ceae1ba51d882db3847be6b2 (MD5) / A imagem corporal refere-se a experiências humanas incorporadas ao longo da vida sobre seu próprio corpo. É um construto multifacetado que une a percepção e as atitudes das pessoas, especialmente as preocupações e atitudes relacionadas à aparência física (Cash, Maikkula & Yamamiya, 2004). Quando distorcida, a representação da imagem corporal pode levar o indivíduo a riscos, tais como transtornos alimentares e depressão (Smolak, 2002), que estão entre os principais e mais sérios problemas clínicos encontrados em meninas adolescentes e mulheres jovens na atualidade (Shroff & Thompson, 2006). O objetivo geral deste estudo foi avaliar aspectos comportamentais e perceptivos da imagem corporal de meninas adolescentes com distúrbio de imagem corporal (GCD) e sem distúrbio de imagem corporal (GSD). Especificamente identificar se parâmetros comportamentais (i.e., nível de satisfação com o próprio corpo) são distintos entre os grupos; verificar em tarefa com silhuetas e em tarefa com imagens do próprio corpo a consistência dos sub-componentes afetivo, cognitivo e perceptivo de ambos os grupos; avaliar se parâmetros perceptivos (i.e., expoente da função psicofísica de potência e magnitude do erro no julgamento de dimensões do próprio corpo) diferem entre os grupos; verificar se parâmetros perceptivos são diferentes entre tarefas que incluem imagens da própria pessoa, de pessoa desconhecida e de estímulo neutro (i.e., projeção frontal de um cubo) e se estas possíveis diferenças ocorrem para ambos os grupos; se fatores como distúrbio de imagem, transtorno alimentar e IMC predizem o nível de insatisfação do próprio corpo e se predizem a magnitude do erro no julgamento de dimensões do próprio corpo. Para tanto, 43 participantes do GSD e 10 participantes do GCD responderam a testes e inventários (BSQ, EAT, escala de silhuetas e escala da imagem própria)... / Body image is a multi-dimensional construct that combines perceptions and attitudes about the body, particularly those that relate to physical appearance (Cash, Maikkula & Yamamiya, 2004). When body image perception is disturbed—most common amongst teenage girls (Shroff & Thompson, 2006), serious health risks may result, which include eating disorders and depression (Smolak, 2002). The purpose of this study was to assess the behavioral and perceptual aspects of body image in adolescent females with and without body image distortion, (BID) and (NBI). Specifically, it was to identify whether or not behavioral parameters are distinct between groups. The study attempted to verify, in both groups, levels of consistency in sub-components: affective, cognitive and perceptual, using tasks that portrayed the individual’s own body as well as a stranger’s body. Also assessed was whether or not perceptual parameters could it be determined, and whether or not perceptual parameters are different for tasks that include an individual’s own body image versus those tasks that include a stranger’s body image and a task with a neutral image. If differences existed between groups, the study attempted to assess whether or not body image disturbance, presence of eating disorder and BMI-body mass index (IMC) predicted levels of individual body dissatisfaction and magnitude of error when the individuals judged the dimensions of their own bodies. Forty-three participants comprised the NBI group, and ten participants comprised the BID group. In order to establish the behavioral components of body image, individuals in both groups were asked to complete questionnaires and inventories (BSQ, EAT, silhouette scale, SIL, and own body image scale, OBI). Also, psychophysical tasks were used to assess the perceptual components of body image. Results of the behavioral aspects related to body image showed that... (Complete abstract click electronic access below)
245

Proposta de indicador de qualidade de tensão a partir do impacto de distorções harmônicas e desequilíbrios sobre motores de indução. / Proposal of voltage quality index taking into account the impact of harmonic distortion and voltage unbalances on induction motors.

Silvio Xavier Duarte 05 September 2006 (has links)
Esta tese discute a necessidade de monitorar, além das tensões eficazes, os desequilíbrios de freqüência fundamental e as distorções harmônicas de tensão. Apresenta uma forma alternativa para obter os parâmetros de desequilíbrios de freqüência fundamental e de distorções harmônicas a partir da representação dos valores instantâneos no sistema de eixos (DQ) e norma Euclidiana instantânea (NEI). Como contribuição principal, o trabalho propõe obter um parâmetro de qualidade que combina os parâmetros de desequilíbrio e de distorção harmônica. A representatividade dos parâmetros de qualidade é analisada a partir de resultados de elevações de temperatura dos enrolamentos de um motor de indução obtidas de 60 horas de testes. Discute-se que uma das vantagens de obter um parâmetro de qualidade de tensão que combine os efeitos de desequilíbrios de freqüência fundamental e distorções harmônicas é reduzir o número de parâmetros que devem ser monitorados, simplificando o processo de fiscalização que os órgãos reguladores procuram implantar. Além disso, o trabalho mostra análises sobre como os distúrbios na tensão afetam um motor de indução e prejudicam sua vida útil e mostra que há outras formas para se obter parâmetros de qualidade de tensão em relação aos métodos convencionais. Finalmente, apresenta a necessidade de estudos futuros para consolidar a proposta de um parâmetro de qualidade que combine os efeitos de distúrbios na tensão relacionados a outros equipamentos. / This thesis outlines the need for monitoring voltage quality, namely fundamental frequency unbalance and harmonic distortions in addition to voltage regulation. It presents an alternative way to obtain voltage fundamental frequency unbalance and harmonic distortion parameters by using the DQ axes system representation applied to instantaneous values and the instantaneous Euclidean norm (IEN). As a main contribution, the work presents a quality parameter that combines the unbalance and harmonic distortion parameters. The representativeness of the quality parameters is analysed based on results of temperature rises in induction motor windings tested during 60 hours. An advantage of obtaining a voltage quality parameter that considers simultaneous effects of both fundamental frequency unbalance and harmonic distortion is the reduction in the number of monitored parameters, thus simplifying the controlling process that regulatory agencies seek to implement. Furthermore, this work shows some analyses on how the voltage disturbances affect an induction motor and reduce its lifetime and shows that there are other forms to compute voltage quality, which are alternatives to conventional methods. Finally, the need for further studies to consolidate the proposal of a quality parameter that combines voltage disturbances effects related to other pieces of equipment is discussed.
246

O impacto da topologia de conexão de transdutores na obtenção de indicadores de qualidade de energia. / The impact of transducers conection type in power quality measurements.

Alex Almeida Pignatti 19 October 2012 (has links)
A Agência Nacional de Energia Elétrica (ANEEL) deverá estabelecer a regulamentação para distúrbios de qualidade de energia em um futuro próximo. Há ainda questões em aberto sobre os procedimentos de medição e limites máximos para os indicadores de qualidade de energia. Este trabalho aborda uma dessas questões, que é a conexão de transdutores e os impactos nos índices de qualidade de energia associados. Simulações em ATPDraw e campanhas de medição foram realizadas de modo a identificar o comportamento dos indicadores de distorção harmónica sob as duas configurações possíveis de conexão de transdutores: dois equipamentos com ligação entre fases ou três com ligação fase-neutro. Os resultados das simulações e os valores medidos mostram grandes discrepâncias entre ambas as configurações, e as diferenças tornam-se ainda mais significativas com o incremento do desequilíbrio do sistema elétrico. As causas subjacentes deste fenômeno são investigadas e discutidas / The Brazilian electricity regulatory agency (ANEEL) is expected to establish a legal framework for quality disturbances in the near future. There are still some open questions regarding metering procedures and maximum limits for Power Quality indicators. This work addresses one of such issues, namely the connection of the associated transducers and its impact on PQ indexes. Simulations in ATPDraw and on-field measurement campaigns were carried out so as to identify the behavior of harmonic distortion indicators under the two possible transducer configurations: two phase-to-phase or three phase-to-neutral transducers. Simulation results and measured values show large discrepancies between both configurations, and the differences become more significant as the electrical systems unbalance increases. The underlying causes of this phenomenon are investigated and discussed.
247

Análise das tensões residuais no processo de trefilação considerando os efeitos de anisotropia

Soares, Carla Adriana Theis January 2012 (has links)
A trefilação de barras é um dos mais antigos processos de conformação mecânica e pode ser definido como um processo de manufatura por deformação plástica, onde o fio-máquina (matéria-prima) é tracionado passando através de uma ferramenta cônica, causando uma redução da área da seção transversal e, aumentando o comprimento total. Este processo introduz tensões residuais no produto final. Parâmetros como ângulo de fieira, coeficiente de atrito e redução, bem como a anisotropia do material tem grande influência nestas tensões. Neste trabalho avaliou-se a influência dos parâmetros citados nas tensões residuais resultantes do processo de trefilação de barras redondas de aço AISI 1045 com diâmetro inicial de 20,46 mm e final, após trefilação, de 20,25 mm, através de simulação numérica, comparando os resultados obtidos numericamente com dados experimentais. Além disso, inseriram-se heterogeneidades nos modelos computacionais de trefilação para que fossem verificados seus efeitos sobre a distorção (empenamento) das barras. Foram criados seis modelos para simular as tensões residuais e para estes, realizadas diferentes validações numéricas, as quais sugerem uma grande proximidade entre o problema físico e o modelo computacional. O atrito teve uma maior influência na força de trefilação do que nas tensões residuais após trefilação. A utilização de duas fieiras para realizar a trefilação mostrou uma redução das tensões residuais trativas na superfície, sendo que reduzindo a distância entre as mesmas, observou-se uma redução ainda maior destas. A consideração da anisotropia do material também mostrou influência considerável no valor das tensões e deve ser levada em conta nas simulações. Observou-se também, pelas comparações entre as simulações, que pelas variações realizadas, os valores das tensões residuais simulados aproximaram-se dos valores experimentais medidos por difração de Nêutrons, porém os resultados ainda não foram satisfatórios. Neste trabalho também são discutidas as possíveis razões das diferenças observadas. / The wire drawing is one of the oldest mechanical forming processes and it may be defined as a manufacturing process for plastic deformation, where the wire rod (raw material) is pulled passing through a conical tool, causing a reduction in cross section area and increasing the total length. This process introduces residual stresses in the final product. Parameters such as die angle, friction coefficient, area reduction and the anisotropy of the material has great influence on these stresses. In this study was evaluated the influence of the parameters mentioned in the residual stresses resulting from the drawing process of round bars of AISI 1045 steel with initial diameter of 20.46 mm and final, after drawing, of 20.25 mm. Through numerical simulation, a comparison of numerical results and experimental data was carried out. Furthermore, heterogeneities were inserted in the drawing computational models to check their effects on distortion (warpage) of the bars. Six models were created to simulate the residual stresses with following numerical validations, showing good approximation between the physical problem and the computational model. Friction had a greater influence on the drawing force than in residual stresses after drawing. The use of two dies to perform the drawing showed a reduction of residual stresses, however if the distance between two dies is reduced, lower levels of resulting tensile residual stresses in the surface are seen. The consideration of the material anisotropy also showed considerable influence on the value of the residual stresses and it should be taken into account in the simulations. Concerning the comparison of simulated and measured residual stresses by the neutron diffraction method, the results approach similar profiles, however the results were still not satisfactory. This work discusses the possible reasons for the observed difference in terms of residual stresses.
248

Avaliação das distorções angulares em juntas de filete

La Porta Neto, Dante Gageiro January 2017 (has links)
Distorções geométricas em partes metálicas unidas através de soldagem a arco elétrico são consequências inerentes ao processo devido ao elevado fluxo de calor necessário para fusão dos metais de base e adição (quando houver). Embora inevitáveis, estas distorções podem ser reduzidas ou eliminadas através do prévio conhecimento do comportamento da junta de acordo com energia aplicada, características geométricas, propriedades do material, entre outros fatores, possibilitando assim a redução de custos com possíveis retrabalhos por meio de alterações de projeto ou ações que as previnam durante a soldagem. Este trabalho utilizou a metodologia de Projeto de Experimentos para avaliar o efeito da energia de soldagem, espessura da aba e espessura da alma na distorção angular em juntas de filete soldadas pelo processo MIG/MAG com modo de transferência curto-circuito. Foi aplicada a Análise de Variância para as distorções angulares das amostras e identificou como significativo o efeito linear da energia de soldagem, o efeito quadrático da espessura da aba e a interação dos fatores energia de soldagem e espessura da aba na distorção angular de juntas de filete. Observou-se mínimas distorções para a combinação de maior energia de soldagem e menor espessura de aba, sendo mínimas também as distorções angulares para a combinação de menor energia de soldagem e maior espessura de aba, independente da espessura da alma para as condições estudadas. Através das macrografias das amostras, identificou-se que razão entre a área total do metal de solda e espessura da aba que gera maior distorção angular é aproximamente 5, com menores distorções angulares para valores inferiores e superiores a esse. Através de um modelo numérico, demonstrou-se que o gradiente de temperatura na aba da junta não determina a máxima distorção angular, e sim a máxima temperatura atingida na superfície inferior da aba, com máxima distorção angular obtida para a amostra que atingiu aproximadamente 425 ºC em ponto na superfície inferior da aba e paralelo à margem do cordão. Por fim, para distorções angulares em função da razão entre a energia de soldagem conduzida pela aba e espessura de aba ao quadrado, observou-se que a distorção angular é crescente até atingir 15,00 J/mm³, e menores distorções angulares para relações superiores a esse valor. / Welding deformation on metallic parts joined by electric arc welding are inherent consequences of the process due to the high heat flux required for melting the base and filler metals (when used). Although unavoidable, these deformations can be reduced or eliminated through prior knowledge of joint behavior in accordance with applied heat input (welding energy), geometric characteristics, material properties, among other factors, thus reducing costs with possible rework through design changes or actions that prevent them during welding. This work uses a methodology proposed by Experimental Design theories to evaluate the effect of heat input, flange thickness and web thickness on angular distortion in fillet joints welded by the GMAW process with short-circuit transfer mode. Was applied Analysis of Variance for the angular distortions of the test specimens and there are significant the linear effect of heat input, the quadratic effect of flange thickness and the interaction of heat input and flange thickness on the angular distortion of fillet joints, observing minimum distortion for the combination of higher heat input and lower flange thickness, and also angular distortions for the combination of lower heat input and higher flange thickness, regardless of the thickness of the web are minimal. Through the macrographs of the samples, it was identified that the ratio of a region of the weld metal to the flange thickness that generates the greatest angular distortion is approximately 5, with smaller angular distortions for lower values and higher than that. Through a numerical model, it has been shown that the temperature gradient in the flange does not determine the maximum angular distortion, but the maximum temperature reached in the lower surface of the flange, with maximum angular distortion obtained for the sample that reached approximately 425ºC in point on the surface bottom of the flange and parallel to the edge of the weld bead. Finally, for angular distortions as a function of the ratio between the heat input conducted by the flange and the squared flange thickness, it was observed that the angular distortion is increasing until reaching 15,00 J/mm³, and smaller angular distortions for higher relations to this value.
249

Structural and Functional Investigation of Promoter Distortion and Opening in the RNA Polymerase II Cleft

Dienemann, Christian 09 April 2018 (has links)
No description available.
250

Vlastnosti zobrazení s konečnou distorzí / Properties of mappings of finite distortion

Campbell, Daniel January 2017 (has links)
In the following thesis we will be mostly concerned with questions related to the regularity of solutions to non-linear elasticity models in the calculus of variations. An important step in this is question is the approximation of Sobolev homeomorphisms by diffeomorphisms. We refine an approximation result of Hencl and Pratelli's which, for a given planar Sobolev (or Sobolev-Orlicz) homeomorphism, constructs a diffeomorphism arbitrarily close to the original map in uniform convergence and in terms of the Sobolev-Orlicz norm. Further we show, in dimension 4 or higher, that such an approximation result cannot hold in Sobolev spaces W1,p where p is too small by constructing a sense-preserving homeomorphism with Jacobian negative on a set of positive measure. The class of mappings referred to as mappings of finite distortion have been proposed as possible models for deformations of bodies in non-linear elasticity. In this context a key property is their continuity. We show, by counter-example, the surprising sharpness of the modulus of continuity with respect to the integrability of the distortion function. Also we prove an optimal regularity result for the inverse of a bi-Lipschitz Sobolev map in Wk,p and composition of Lipschitz maps in Wk,p comparable with the classical inverse mapping theorem. As a...

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