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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.
1

Working Attitude and Peer Group Effect of Shirking

Lin, Fang-Yi 19 June 2008 (has links)
none
2

An ecological study of the gregarious wood-feeding cockroach Panesthia angustipennis spadica / 食材性オオゴキブリの生態学的研究

Ito, Hiroki 23 March 2023 (has links)
京都大学 / 新制・課程博士 / 博士(農学) / 甲第24656号 / 農博第2539号 / 新制||農||1097(附属図書館) / 学位論文||R5||N5437(農学部図書室) / 京都大学大学院農学研究科森林科学専攻 / (主査)教授 北山 兼弘, 教授 田中 千尋, 教授 松浦 健二 / 学位規則第4条第1項該当 / Doctor of Agricultural Science / Kyoto University / DGAM
3

Swelling and Contraction Properties for Polyelectrolytes Multilayers and Polymer Thin Films Measured by In-situ Ellipsometry

Ma, Yubing January 2016 (has links)
No description available.
4

Hur påverkas individens relation till familj och trossamfund vid ett utträde : En kvalitativ studie utifrån fem personers upplevelse / How affected individual's relationship to family and a religious community at an exit : A qualitative study based onfive persons´ experience

Geinäs, Ulrika January 2015 (has links)
Studien fokuserar på personer som lämnat något av de klassiska trossamfunden. Även om utträdet sker utifrån den egna övertygelsen, innebär det oftast en omvälvning att lämna för att söka ny identitet och kontext. Syftet är att undersöka hur individens relation till familj och trossamfund påverkats vid ett utträde. Fem personer som lämnat sitt trossamfund intervjuades med hjälp av semistrukturerade, kvalitativa djupintervjuer. Exitprocessen kan ses som ett avhopp från av en roll som varit central för individens självidentitet. I skapandet av en ny roll finns fragment av gamla rollen kvar med in i den nya identiteten, tillsammans formar dessa en ex-roll. Studiens resultat visar att det fanns en tydlig åtskillnad mellan hur tro kommunicerades i församling och inom familjesystemet. Trots att förkunnelsen påverkade både personlig livsstil och familjestruktur var detta inget som barn och föräldrar samtalade om. Resultatet visar även att informanterna intog en ex-roll i fråga om kulturkrock mellan det icke-kristna och en auktoritär gudsbild, vilket ledde fram till att de slutligen lämnade trossamfundet. I slutdiskussionen framkommer att den kristna tron kan fortsätta vara av betydelse i en ex-roll, även om den blivit mer komplicerad. Den gudsbild som informanterna erhållit kan hänga samman med relationen till föräldrarna och deras anknytning. / This study focuses on people who have left one of the classic church denominations. Even if the departure is based on their individual beliefs, it usually involves an upheaval to seek a new identity and context. The intention of the study is to explore how the individual's relationship to family and faith communities was affected by the exit. Five people who left their church communities were interviewed using semi-structured qualitative interviews. Exitprocess can be seen as a left of a role that has been central to the individual's self-identity. In a new identity the creation of a new role are fragments of the old role left into the new identity that together form an ex-roll. The study results show that there was a clear distinction between how the faith was communicated in the congregation and within the family system. Although the preaching affected both personal lifestyle and family structure it was not discussed between children and parents. The result also shows that the respondents took an ex-role in the cultural clash between the non-Christian and authoritarian image of God, which led to the conclusion that they finally left the community. In the discussion, it appears that the Christian faith can continue to be of importance in an ex-roll, although it has become more complicated. The image of God as informants received may be related to the relationship with the parents and their extension.
5

Efeito de grupo em estacas carregadas transversalmente associadas a solos melhorados

Born, Ricardo Bergan January 2015 (has links)
O conjunto estaca-solo submetido a carregamentos horizontais é caracterizado por um comportamento não-linear. A propagação das tensões no solo próximo à estaca decai rapidamente em função do espaçamento, porém para estacas próximas, caracterizando um grupo de estacas, pode haver uma sobreposição de tensões, gerando zonas com tensões elevadas, que formam áreas de plastificação maiores. A interação da sobreposição destas zonas plastificadas, resultam em maiores deformações para o grupo de estacas, ante comparadas com o equivalente de soma da capacidade individual de cada estaca (Chaudhry, 1994). Deste comportamento, deriva-se o chamado efeito de grupo, que age como um redutor da eficiência total das estacas. Através de modelos numéricos tridimensionais, avaliou-se o efeito de espaçamento entre estacas em solo natural, onde fatores de eficiência do grupo foram propostos. O comportamento de estacas carregadas lateralmente é conhecido por ter seu comportamento diretamente relacionado com as características da parte superior do solo. Recomendações feitas há mais de 30 anos já lidavam com este comportamento {e.g. Simons eMenzies (1975); Broms (1972)}, e tratavam com soluções que melhoravam a capacidade de carga lateral, com a substituição da parte superior do solo por um material mais rígido. Embora estas soluções melhorassem a capacidade de carga lateral, a técnica reflete uma prática de substituição de material. Neste trabalho, uma técnica de melhoramento de solo, lidando com areia cimentada é apresentada, estudando numericamente o comportamento de grupos de estacas submetidos a carregamentos laterais. As conclusões apontam fatores de eficiência próximos a unidade em espaçamentos superiores a 6 diâmetros, porém com a tendência a inexistir somente em espaçamentos superiores a 10 diâmetros. A inserção da camada de solo cimento no topo do grupo de estaca, mostrou uma expressiva melhora de seu comportamento, eliminando por total a perda de eficiência devido ao efeito de grupo. / The soil-pile set when subjected to lateral loads is characterized by a non-linear behavior. The stress distribution on the soil near the pile decays rapidly in magnitude with radial distance, but for closely spaced piles within a group, these yielded zones of the soil around individual piles overlap, forming larger yielded zones in the soil surrounding the pile group. The interaction arising due to overlapping of these yielded zones results in a larger deflection for the group of piles before the lateral resistance equivalent to that for a single pile (Chaudhry, 1994). Based on this behavior, the group effect is derived, which acts as a reducer of the piles efficiency. Through tridimensional numerical models, the effects of the pile spacing in natural soil were evaluated, and group efficiency factors had been proposed. The behavior of laterally loaded piles is well known to be straightly related to characteristics of the upper part of the soil. Recommendations of over 30 years in past already dealt with this behavior {e.g. Simons and Menzies (1975); Broms (1972)}, and treated with solutions that improved the lateral resistance, by substituting the upper part of the soil with a more rigid material. Besides those solutions improved the lateral resistance, the technique reflects a practice of material replacement. Here, a ground improvement technique, dealing with cemented sand is presented, studying numerically the behavior of piles subjected to lateral forces. Conclusions shows group efficiency factors close to unity on spacing larger than 6 diameters, but tending to disappear only on spacing larger than 10 diameters. The insertion of a soil cement layer on the top of the pile group has shown an expressive improvement on its behavior, eliminating the loss of efficiency due to the group effect.
6

Efeito de grupo em estacas carregadas transversalmente associadas a solos melhorados

Born, Ricardo Bergan January 2015 (has links)
O conjunto estaca-solo submetido a carregamentos horizontais é caracterizado por um comportamento não-linear. A propagação das tensões no solo próximo à estaca decai rapidamente em função do espaçamento, porém para estacas próximas, caracterizando um grupo de estacas, pode haver uma sobreposição de tensões, gerando zonas com tensões elevadas, que formam áreas de plastificação maiores. A interação da sobreposição destas zonas plastificadas, resultam em maiores deformações para o grupo de estacas, ante comparadas com o equivalente de soma da capacidade individual de cada estaca (Chaudhry, 1994). Deste comportamento, deriva-se o chamado efeito de grupo, que age como um redutor da eficiência total das estacas. Através de modelos numéricos tridimensionais, avaliou-se o efeito de espaçamento entre estacas em solo natural, onde fatores de eficiência do grupo foram propostos. O comportamento de estacas carregadas lateralmente é conhecido por ter seu comportamento diretamente relacionado com as características da parte superior do solo. Recomendações feitas há mais de 30 anos já lidavam com este comportamento {e.g. Simons eMenzies (1975); Broms (1972)}, e tratavam com soluções que melhoravam a capacidade de carga lateral, com a substituição da parte superior do solo por um material mais rígido. Embora estas soluções melhorassem a capacidade de carga lateral, a técnica reflete uma prática de substituição de material. Neste trabalho, uma técnica de melhoramento de solo, lidando com areia cimentada é apresentada, estudando numericamente o comportamento de grupos de estacas submetidos a carregamentos laterais. As conclusões apontam fatores de eficiência próximos a unidade em espaçamentos superiores a 6 diâmetros, porém com a tendência a inexistir somente em espaçamentos superiores a 10 diâmetros. A inserção da camada de solo cimento no topo do grupo de estaca, mostrou uma expressiva melhora de seu comportamento, eliminando por total a perda de eficiência devido ao efeito de grupo. / The soil-pile set when subjected to lateral loads is characterized by a non-linear behavior. The stress distribution on the soil near the pile decays rapidly in magnitude with radial distance, but for closely spaced piles within a group, these yielded zones of the soil around individual piles overlap, forming larger yielded zones in the soil surrounding the pile group. The interaction arising due to overlapping of these yielded zones results in a larger deflection for the group of piles before the lateral resistance equivalent to that for a single pile (Chaudhry, 1994). Based on this behavior, the group effect is derived, which acts as a reducer of the piles efficiency. Through tridimensional numerical models, the effects of the pile spacing in natural soil were evaluated, and group efficiency factors had been proposed. The behavior of laterally loaded piles is well known to be straightly related to characteristics of the upper part of the soil. Recommendations of over 30 years in past already dealt with this behavior {e.g. Simons and Menzies (1975); Broms (1972)}, and treated with solutions that improved the lateral resistance, by substituting the upper part of the soil with a more rigid material. Besides those solutions improved the lateral resistance, the technique reflects a practice of material replacement. Here, a ground improvement technique, dealing with cemented sand is presented, studying numerically the behavior of piles subjected to lateral forces. Conclusions shows group efficiency factors close to unity on spacing larger than 6 diameters, but tending to disappear only on spacing larger than 10 diameters. The insertion of a soil cement layer on the top of the pile group has shown an expressive improvement on its behavior, eliminating the loss of efficiency due to the group effect.
7

Efeito de grupo em estacas carregadas transversalmente associadas a solos melhorados

Born, Ricardo Bergan January 2015 (has links)
O conjunto estaca-solo submetido a carregamentos horizontais é caracterizado por um comportamento não-linear. A propagação das tensões no solo próximo à estaca decai rapidamente em função do espaçamento, porém para estacas próximas, caracterizando um grupo de estacas, pode haver uma sobreposição de tensões, gerando zonas com tensões elevadas, que formam áreas de plastificação maiores. A interação da sobreposição destas zonas plastificadas, resultam em maiores deformações para o grupo de estacas, ante comparadas com o equivalente de soma da capacidade individual de cada estaca (Chaudhry, 1994). Deste comportamento, deriva-se o chamado efeito de grupo, que age como um redutor da eficiência total das estacas. Através de modelos numéricos tridimensionais, avaliou-se o efeito de espaçamento entre estacas em solo natural, onde fatores de eficiência do grupo foram propostos. O comportamento de estacas carregadas lateralmente é conhecido por ter seu comportamento diretamente relacionado com as características da parte superior do solo. Recomendações feitas há mais de 30 anos já lidavam com este comportamento {e.g. Simons eMenzies (1975); Broms (1972)}, e tratavam com soluções que melhoravam a capacidade de carga lateral, com a substituição da parte superior do solo por um material mais rígido. Embora estas soluções melhorassem a capacidade de carga lateral, a técnica reflete uma prática de substituição de material. Neste trabalho, uma técnica de melhoramento de solo, lidando com areia cimentada é apresentada, estudando numericamente o comportamento de grupos de estacas submetidos a carregamentos laterais. As conclusões apontam fatores de eficiência próximos a unidade em espaçamentos superiores a 6 diâmetros, porém com a tendência a inexistir somente em espaçamentos superiores a 10 diâmetros. A inserção da camada de solo cimento no topo do grupo de estaca, mostrou uma expressiva melhora de seu comportamento, eliminando por total a perda de eficiência devido ao efeito de grupo. / The soil-pile set when subjected to lateral loads is characterized by a non-linear behavior. The stress distribution on the soil near the pile decays rapidly in magnitude with radial distance, but for closely spaced piles within a group, these yielded zones of the soil around individual piles overlap, forming larger yielded zones in the soil surrounding the pile group. The interaction arising due to overlapping of these yielded zones results in a larger deflection for the group of piles before the lateral resistance equivalent to that for a single pile (Chaudhry, 1994). Based on this behavior, the group effect is derived, which acts as a reducer of the piles efficiency. Through tridimensional numerical models, the effects of the pile spacing in natural soil were evaluated, and group efficiency factors had been proposed. The behavior of laterally loaded piles is well known to be straightly related to characteristics of the upper part of the soil. Recommendations of over 30 years in past already dealt with this behavior {e.g. Simons and Menzies (1975); Broms (1972)}, and treated with solutions that improved the lateral resistance, by substituting the upper part of the soil with a more rigid material. Besides those solutions improved the lateral resistance, the technique reflects a practice of material replacement. Here, a ground improvement technique, dealing with cemented sand is presented, studying numerically the behavior of piles subjected to lateral forces. Conclusions shows group efficiency factors close to unity on spacing larger than 6 diameters, but tending to disappear only on spacing larger than 10 diameters. The insertion of a soil cement layer on the top of the pile group has shown an expressive improvement on its behavior, eliminating the loss of efficiency due to the group effect.
8

Numerical investigation of lateral behaviour of a large pile group supporting an LNG tank

Jones, Kimberly 30 August 2021 (has links)
Liquefied natural gas (LNG) storage tanks are often supported by very large pile groups (≥ 100 piles). As these superstructures tend to be located along coastal areas, there is often a high risk of extreme lateral loading caused by either seismic, flooding or hurricane activity. In many cases, the foundation design can be governed by the required lateral resistance. At present, the responses of large pile groups subjected to lateral loading are not well understood. Published guidance for design is premised upon experimental testing of smaller pile groups (< 25 piles), and no additional commentary is provided to advise the design for groups of a larger scale. A typical approach for design of laterally loaded pile groups uses the beam on Winkler foundations method, where nonlinear p-y curves are reduced by a p-multiplier to account for the group effects. Alternatively, an average p-multiplier known as a group reduction factor (GRF) can be used. Chapter 1 details the study of using 3D continuum finite element (FE) models to measure the group effects in large pile groups using p-multipliers and GRF. Soil conditions, pile spacing, pile number, and pile head condition were varied to observe their effects. The study also looked at the effect of the circular configuration of pile groups used in LNG tank foundations. The design standards and prevailing methods were shown to overestimate trailing row p-multipliers for large pile groups, particularly with larger pile spacing. Based on the study data and published data, a predictive equation was proposed for estimating GRF of a laterally loaded large pile group. In addition, geotechnical engineers tend to evaluate the lateral responses of pile groups regardless of the presence of superstructures. It is not known whether this approach is suited for large infrastructure such as LNG storage tanks and their respective foundations. Chapter 2 captures the results from 3D finite element (FE) models used to observe the integrated tank and piled foundation behaviour and evaluate whether the current design approach used in practice is suitable. In addition, changes to soil-foundation stiffness, including varying soil conditions and pile spacing, were made to observe their effects. The results found that the foundation responses in the integrated model varied significantly from models which only considered the foundation. It was also found that the amount of LNG in the tank, soil conditions, and pile spacing also affected the lateral pile responses, particularly the leading and trailing piles. / Graduate
9

Personality, values, and cultural perceptions in the sojourner context

Söldner, Tobias 30 May 2013 (has links)
In der vorliegenden Studie wird anhand von sechs vorwiegend studentischen Stichproben von Teilnehmern zeitlich befristeter Austauschprogramme zwischen Deutschland, Japan, und den USA („Sojourner“) der Zusammenhang zwischen Persönlichkeit, Werten, kultureller Distanz und Akkulturation untersucht. Die einleitenden Analysen zeigen, dass alle Teilnehmergruppen die Persönlichkeits- und Werteunterschiede zwischen den Bewohnern der einzelnen Länder ähnlich einschätzten. Andererseits wiesen diese direkten Einschätzungen keinerlei Übereinstimmung mit angeblichen Kulturunterschieden, wie sie sich indirekt auf Basis aggregierter Selbsteinschätzungen berechnen lassen, auf. Ebenso konnte gezeigt werden, dass zwar einige wenige Persönlichkeitseigenschaften und Werte vermutlich als „typisch“ für Sojourner im allgemeinen zu betrachten sind, im Gegensatz dazu jedoch sowohl die Ausgangswerte, als auch die Entwicklung der meisten Charakteristika während des Auslandsaufenthalts, zwischen Teilnehmern unterschiedlicher Nationalität stark variieren. Ein Vergleich von Persönlichkeits- und Werte-Selbsteinschätzungen mit entsprechenden Unterschieden zwischen Herkunfts- und Zielkultur lässt darauf schließen, dass Sojourner dazu tendieren, gezielt in Länder zu reisen, mit deren Bewohnern sie in bestimmten Merkmalen übereinstimmen, und dass die wahrgenommene Ähnlichkeit zu den Bewohnern der jeweiligen Gastgebernation nach der Rückkehr ins Herkunftsland nochmals zunimmt. Der Grad der erreichten Akkulturation während des Auslandsaufenthaltes (insbesondere jener der Zielkultur-Orientierung) ermöglichte über alle Teilnehmergruppen hinweg eine Vorhersage von Gesundheit und Lebenszufriedenheit, war jedoch nur schwach mit der Aufenthaltsdauer korreliert. Zusätzliche Varianz im Akkulturationsgrad konnte durch Persönlichkeit und Werte der Teilnehmer, sowie durch die Größe der entsprechenden Unterscheide zwischen Herkunfts- und Zielland auf Kulturebene aufgeklärt werden. / The present study examined the relationship between personality, personal values, cultural distance and acculturation in primarily academic sojourners travelling between Germany, Japan, and the US. A Preliminary analysis revealed that ratings for the culture-level personality and values differences between each culture were highly consistent across sojourner groups, but that these ratings showed no relation to alleged cultural differences as calculated from national self-rating means. Subsequent analyses discovered a small subset of personality traits and values typical for sojourners in general, while most pre-sojourn characteristics and their development abroad strongly differed across national groups. A significant trend for participants to seek out host cultures fitting their own personality and values patterns was mirrored by an increase in self-rated similarity to host culture members after the return home. The degree of acculturation (especially host culture orientation) reached throughout the sojourn significantly predicted health and life satisfaction across participant samples, but turned out to be only weakly related to the time spent in the host country. Additional variance in acculturation success was explained by participant personality, personal values, and the associated culture-level difference between host and home countries.
10

Contribuição ao estudo do efeito tridimensional de instalação e de grupo em estacas cravadas em areia. / Contribution to the 3D prediction of installation and group effect on driven piles in sand.

Alessandra Conde de Freitas 19 March 2010 (has links)
O efeito de instalação de estacas cravadas em areia, que promove um aumento da compacidade do solo e de seus parâmetros de resistência e deformabilidade, é analisado nesta dissertação em conjunto com o efeito de grupo. O procedimento estabelecido objetiva quantificar a melhoria após a instalação de um grupo de estacas e foi desenvolvido nesta pesquisa a partir da contribuição de Alves (1998). Para a utilização deste procedimento, foram propostas correlações do módulo de Young do solo em função da resistência à penetração NSPT (ou da resistência à penetração normalizada N60), a partir de um banco de dados obtido da literatura, visando não apenas as aplicações implementadas neste estudo, como também nortear futuras aplicações práticas. Na análise de casos documentados da literatura, foi utilizado o programa Plaxis 3D Foundation. Inicialmente foi procedida a calibração do programa através da reprodução de um caso de instrumentação de um grupo de estacas na argila rija de Londres, muito bem documentado por Cooke et al. (1980). Os resultados das simulações, com parâmetros do solo obtidos da literatura, se ajustaram muito bem aos resultados experimentais, seja nos valores de recalque, seja nos diagramas de transferência de carga. Posteriormente, a melhoria do solo por efeito da instalação foi estimada, através do procedimento estabelecido nesta dissertação, baseado em Alves (1998), a partir das características iniciais do solo antes da instalação de um grupo de estacas em modelo reduzido em solo arenoso. Obtidos os parâmetros melhorados previstos para o solo após a instalação, estes foram aplicados a um grupo de 9 estacas, para diferentes espaçamentos relativos, como dados de entrada no programa Plaxis. A comparação dos resultados experimentais com aqueles simulados numericamente sinaliza para o potencial tanto do programa Plaxis, na reprodução do comportamento do conjunto, como do modelo de Alves (1998), que norteou o procedimento proposto nesta pesquisa. O fator de escala, ressaltado na dissertação, bem como outros aspectos relevantes observados nas análises realizadas, são propostos como temas futuros a serem investigados na continuidade desta linha de pesquisa. / The installation effect of piles driven in sand, which increases soill density, strength and deformability parameters, is analyzed in this research, together with the pile-group effect. The procedure has been established aiming at the soil improvement achieved after installation of the piles. The proposed procedure is based on Alves (1998). In order to apply the procedure, correlations between the soil Young modulus and the NSPT blow count (or the normalized N60) have been established from a database obtained in the literature, aiming not only at the applications implemented in this study but also as a guideline for future practical applications. The program Plaxis 3D Foundation has been used in the analysis of documented cases from the literature, as an initial step to implement the procedure proposed in this thesis. Initially, the program has been calibrated by application to a well-documented piling group in the London stiff clay by Cooke et al. (1980). The results of the numerical simulations with soil parameters obtained from the literature have been very close to the experimental values, not only for the settlements, but also for the load transfer diagrams. The soil improvement due to pile installation has been implemented in this thesis based on Alves (1998). It has been applied to a case of small-scale model piling group in sands, taking into consideration the initial characteristics of the soil before installation and the soil improvement after driving. The updated parameters, together with different pile spacing in the 9-pile group, have been entered as input in the program Plaxis 3D Foundation. The comparison of the experimental results with those numerically simulated shows the potentiality of Plaxis program, due to its ability to properly reproduce the piling group behavior, and also of the model by Alves (1998), which guided the soil improvement procedure proposed in this research. The scale factor, highlighted in the thesis, as well as other relevant factors observed in the analyses, are topics for further investigation in continuity of this research.

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