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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.
11

Localization of a particle due to dissipation in 1 and 2 dimensional lattices

Hasselfield, Matthew 11 1900 (has links)
We study two aspects of the problem of a particle moving on a lattice while subject to dissipation, often called the "Schmid model." First, a correspondence between the Schmid model and boundary sine-Gordon field theory is explored, and a new method is applied to the calculation of the partition function for the theory. Second, a traditional condensed matter formulation of the problem in one spatial dimension is extended to the case of an arbitrary two-dimensional Bravais lattice. A well-known mathematical analogy between one-dimensional dissipative quantum mechanics and string theory provides an equivalence between the Schmid model at the critical point and boundary sine-Gordon theory, which describes a free bosonic field subject to periodic interaction on the boundaries. Using the tools of conformal field theory, the partition function is calculated as a function of the temperature and the renormalized coupling constants of the boundary interaction. The method pursues an established technique of introducing an auxiliary free boson, fermionizing the system, and constructing the boundary state in fermion variables. However, a different way of obtaining the fermionic boundary conditions from the bosonic theory leads to an alternative renormalization for the coupling constants that occurs at a more natural level than in the established approach. Recent renormalization group analyses of the extension of the Schmid model to a two-dimensional periodic potential have yielded interesting new structure in the phase diagram for the mobility. We extend a classic one-dimensional, finite temperature calculation to the case of an arbitrary two-dimensional Bravais lattice. The duality between weak-potential and tightbinding lattice limits is reproduced in the two-dimensional case, and a perturbation expansion in the potential strength used to verify the change in the critical dependence of the mobility on the strength of the dissipation. With a triangular lattice the possibility of third order contributions arises, and we obtain some preliminary expressions for their contributions to the mobility.
12

Education and the Art of Living

Teschers, Christoph January 2013 (has links)
Today’s societies are characterised by a host of opportunities and challenges. The pace of life is quicker than ever before, and the changes and developments in societies, science and technology come about faster every day. One of the major challenges for human beings is to make a myriad of choices on a daily basis, which will define their place in society, in life and in the world altogether. To make prudent and sensible decisions is, therefore, one of the key competencies for a successful and good life. This study revisits the idea of an education focused on the personal development and well-being of human beings instead of economic growth. Drawing on philosophical ideas about the good life -- especially Schmid’s art of living concept Lebenskunst -- and recent research in positive psychology, an argument is made for a shift of focus in education and schooling towards a good life and an art of living for today's students. Possible implications of this change of focus for educational practice are discussed, including suggestions for curricula and school subjects, the structure of schools and learning environments, teaching methods, and teacher training. The original contributions to knowledge in this study are: a critique of Schmid's concept from an educational point of view; a comparison of positive psychology research and philosophical concepts of the art of living with a focus on Schmid's work; the development of an educational approach to the art of living, including a discussion of schooling in relation to the art of living; and consequent first steps towards the development of an education for life concept.
13

The role of ATF6α and ATF6β in the UPR associated with an ER stress-induced skeletal chondrodysplasia

Forouhan, Mitra January 2016 (has links)
Mutations in the COL10A1 gene cause metaphyseal chondrodysplasia type Schmid (MCDS) by triggering ER stress and unfolded protein response (UPR). MCDS is characterised by a mild short-limb dwarfism accompanied by expansion of the cartilage growth plate hypertrophic zone (HZ) and altered differentiation of hypertrophic chondrocytes (HCs). ATF6 is one of the UPR mediators, which exists in two isoforms, ATF6α and ATF6β. Activation and up-regulation of ATF6α was a prominent biochemical sign of ER stress in a mouse model of MCDS, COL10a1 p.N617K. Although ATF6β is induced and activated in response to ER stress in a similar fashion to ATF6α, the role and significance of ATF6β in the pathology of many ER stress-associated diseases including MCDS is unknown. Here we utilized a combination of in vitro and in vivo approaches to define the precise role of each isoform of ATF6 in MCDS.To investigate the functions of ATF6α and ATF6β in vitro, we developed a MCDS cell model system (expressing either the wild type collagen X or one of the following MCDS-causing mutant forms of the protein: p.N617K, G618V, Y598D, and NC1del10) in which the expression of either ATF6α or ATF6β was efficiently silenced using siRNAs. ATF6α knockdown in HeLa cells expressing different MCDS-causing mutations suppressed the increased expression of UPR-associated genes such as BiP leading to an elevated ER stress, based on increased XBP1 splicing and/or ATF4 protein. In contrast, ATF6β knockdown did not significantly affect the mutant collagen X-induced increased expression of UPR-associated genes. Furthermore, the ER stress levels were significantly reduced in the ATF6β knockdown MCDS mutant cells based on the lower levels of XBP1 splicing and/or ATF4 protein detected. We then crossed the ATF6α/β knockout mice models with COL10a1 p.N617K mouse model of MCDS to investigate the function of ATF6α and ATF6β in vivo. Ablation of ATF6α in MCDS mice further- reduced the endochondral bone growth rate, further expanded the growth plate hypertrophic zone, and disrupted differentiation of HCs. Therefore, ATF6α appeared to play a chondroprotective role in MCDS as its deficiency caused an increase in the severity of the disease. Of particular note, the level of ER stress was further increased in the absence of ATF6α in MCDS, based on enhanced activities of PERK and IRE1 signalling pathways in compensation for the ATF6α loss. Paradoxically, ablation of ATF6β in MCDS mice reduced the intracellular retention of collagen X protein, and alleviated the ER stress as judged by the attenuated activities of PERK and IRE1 signalling pathways. The reduced ER stress resulting from deficiency for ATF6β in MCDS mice restored the expression of collagen X mRNA towards normal and improved the differentiation of HCs, causing a mark decrease in the expansion of HZ. The results presented within this thesis greatly increased our understanding of the function of ATF6α and ATF6β and their interplay in the pathogenesis of MCDS. We demonstrated an indispensable beneficiary role for ATF6α but a detrimental role for its closely related isoform, ATF6β, in pathology of MCDS. We also showed that the role of ATF6β should not be ignored. These findings may be used to develop a potential therapeutic strategy for MCDS through targeting and enhancing ATF6α-dependent and/or attenuating/blocking of ATF6β-dependent signalling pathways.
14

Sur les cohomologies des variétés de Griffiths-Schmid du groupe SU(2,2).

Charbord, Benjamin 04 March 2010 (has links) (PDF)
Dans cette thèse, on s'intéresse, sous deux aspects différents, à la cohomologie des variétés de Griffiths-Schmid attachées à une forme anisotrope du groupe SU(2,2). Ces variétés ont l'avantage, au contraire des variétés de Shimura, de parfois faire apparaître dans leur cohomologie des limites dégénérées de séries discrètes. La première partie étudie ce phénomène dans le cas des limites totalement dégénérées. On prouve que les classes attachées à ces représentations peuvent s'exprimer comme cup-produits d'autres classes attachées à des séries discrètes. La seconde partie étudie les liens entre deux différentes variétés de Griffiths-Schmid obtenues à partir de deux structures complexes. L'une est celle considérée dans la première partie, et l'autre est fibrée holomorphiquement sur une variété de Shimura. On prouve l'existence d'une application bijective entre certains espaces de cohomologie, en s'appuyant sur une interprétation en termes de fonctions holomorphes de la cohomologie de Dolbeault. Ce résultat est généralisé dans l'annexe aux cas des groupes SU(n,n) et SU(n+1,n).
15

Erfolgreiche Kinderbuchautoren des Biedermeier : Christoph von Schmid, Leopold Chimani, Gustav Nieritz, Christian Gottlob Barth : von der Erbauung zur Unterhaltung /

Füller, Klaus Dieter, January 2006 (has links)
Texte remanié de: Diss.--Heidelberg--Universität, 2002. / Notes bibliogr.
16

Der Wandel im deutschen Film der 90er Jahre: Eine Analyse zum Stil der Filme von Hans-Christian Schmid und Tom Tykwer

Lee, Ju-Bong 18 August 2006 (has links)
Die vorliegende Studie beschäftigt sich im Hinblick auf die Entwicklung des deutschen Films der 90er Jahre mit den Filmemachern Hans-Christian Schmid und Tom Tykwer. Um die persönliche Handschrift des jeweiligen Filmemachers herauszuarbeiten, konzentriert sie sich auf die textbezogen angelegte Analyse des einzelnen Filmemachers, wobei ausgehend vom formalen Stil die Themen des Films und die Ideale des Filmemachers zu analysieren sind. Dabei arbeitet sie heraus, dass Tykwer und Schmid in einem persönlichen Darstellungswillen, einer handwerklichen Handschrift und einem unverwechselbaren Stil ihre eigene, filmästhetische und gehaltvolle Filmwelt zeigen.Beide Filmemacher unterscheiden sich stilistisch stark voneinander. Schmid setzt auf eine realistische Darstellung, wobei er meistens mit Hilfe der Charaktere seine Geschichte erzählt. Mit den beeindruckenden Figurenzeichnungen gewinnt er eine filmische Realität, in der man Wahrheitsgehalt und Zeitgeist spüren kann. Hingegen legt Tykwer sein Vertrauen auf die Imagination der Bilder und gewinnt eine bildliche Qualität, bei der er die Kinomittel meisterhaft benutzt. Damit zaubert er eine fantastische Bilderwelt ins Kino. Trotz aller Unterschiede zwischen den beiden Filmemachern zeigen sie als Angehörige derselben Generation auch Gemeinsamkeiten. Es geht bei der Stilisierung der beiden Regisseure um die Menschen unserer Zeit und deren Gefühle. Hieraus ergibt sich eine universale Bedeutung, die auch den künstlerischen Charakter des Mediums Film ausmacht. Beide Filmemacher entwickeln ihren unverwechselbar eigenen Stil. Mit diesem behandeln sie allgemeingültige Themen, die dadurch weder verbraucht noch abgenutzt wirken.
17

Peter Schmid e a Abordagem Centrada na Pessoa: uma aproximação à alteridade radical / Peter Schmid and Carl Rogers: an approach to radical alterity

ARAÚJO, Iago Cavalcante January 2014 (has links)
ARAÚJO, Iago Cavalcante. Peter Schmid e a Abordagem Centrada na Pessoa: uma aproximação à alteridade radical. 2015. 116f. – Dissertação (Mestrado) – Universidade Federal do Ceará, Programa de Pós-graduação em Psicologia, Fortaleza (CE), 2014. / Submitted by Márcia Araújo (marcia_m_bezerra@yahoo.com.br) on 2015-06-05T15:29:24Z No. of bitstreams: 1 2014_dis_icaraujo.pdf: 1035970 bytes, checksum: 7a2baf5b3ee9043c0608ba563346d681 (MD5) / Approved for entry into archive by Márcia Araújo(marcia_m_bezerra@yahoo.com.br) on 2015-06-05T17:19:35Z (GMT) No. of bitstreams: 1 2014_dis_icaraujo.pdf: 1035970 bytes, checksum: 7a2baf5b3ee9043c0608ba563346d681 (MD5) / Made available in DSpace on 2015-06-05T17:19:35Z (GMT). No. of bitstreams: 1 2014_dis_icaraujo.pdf: 1035970 bytes, checksum: 7a2baf5b3ee9043c0608ba563346d681 (MD5) Previous issue date: 2014 / The Person Centred Approach (PCA), founded by Carl Rogers, can only be justified from a set of values and ethics and not only as an application of skills and knowledge. Furthermore, from studies of Figueiredo (1996), it is established the importance of ethos as a search for a place to the Other in the constitution of psychologies. In what refers to the place of the Other in the constitution of subjectivity, Freire (2002) investigates the place to alterity in several modern psychologies and states that in PCA, the place for Levinas’ radical alterity is vacant, as in other psychologies. The Other, as postulated by Levinas (2008 [1961]), is precedent and transcendent to the I; not being possible to totalize and understand it fully; it shows the dimension of the strange in the psychological experience. This Other is not so dear figure to psychologies as it appears to be. On the other hand, Peter Schmid (1999) conceives that ethics is the first issue to be considered when it comes to PCA, either its theory or its practice. Hence, the present paper aims to present the work of Peter Schmid to the Brazilian community of Rogerian approach. The perspective of this author is grounded in an important dialogue with the philosophies of dialogue and a vision of the human as radically a person, which offers another way to face the alterity in Rogerian theory and practice. Such change presents a fruitful approach to ethical philosophy of Emmanuel Levinas. A methodology for the study, we used an almost-in-method inspired by the philosophies of Levinas (2008 [1961]) and Derrida (2007), in which we seek, among other things, to put on display the polysemy of the studied speeches. We conclude that, despite the divergences among the prospect formulated by Schmid with Levinasian ethics, doing readings of the main concepts of the PCA, it shows a closer relationship with that one and a new way of dealing with the alterity within the framework of the Rogerian approach. With this work, we hope to foment a greater dialogue and production on the clinical and psychotherapeutic care of the person and the place offered to otherness in Rogerian psychology. / A Abordagem Centrada na Pessoa (ACP), fundada por Carl Rogers, só pode ser justificada a partir de um conjunto de valores e de uma ética e não somente como uma aplicação de técnicas e conhecimentos. Além disto, a partir dos estudos de Figueiredo (1996) fica estabelecida a importância do éthos como busca de um lugar para o Outro na constituição das psicologias. Naquilo que se refere ao Lugar do Outro na constituição da subjetividade, Freire (2002) investiga o lugar para a alteridade nas diversas psicologias modernas e afirma que, na ACP, o lugar para a alteridade radical levinasiana está vacante, assim como nas demais psicologias. O Outro, conforme postulado por Lévinas (2008 [1961]), é precedente e transcendente ao Eu; não sendo possível totalizá-lo e compreendê-lo inteiramente, ele apresenta a dimensão do estranho na experiência psicológica. Este Outro não é figura tão cara para as psicologias como aparenta ser. Por outro lado, Peter Schmid (1999) concebe que a ética é a primeira questão a ser pensada quando se trata da ACP, quer de sua teoria, quer de sua prática. Daí que este trabalho objetivou apresentar a obra de Peter Schmid à comunidade brasileira da abordagem rogeriana. A perspectiva deste autor está alicerçada em um diálogo importante com as filosofias do diálogo e uma visão do humano como radicalmente pessoa, o que oferece outra forma de encarar a alteridade na teoria e prática rogerianas. Tal mudança apresenta uma profícua aproximação com a filosofia ética de Emmanuel Lévinas. Como metodologia para o estudo, utilizou-se um quase-método inspirado nas filosofias de Lévinas (2008 [1961]) e Derrida (2008), em que buscamos, entre outras coisas, pôr à mostra a polissemia dos discursos estudados. Concluiu-se que, apesar da perspectiva formulada por Schmid apresentar divergências com a ética levinasiana, ao fazer releituras dos principais conceitos da ACP, ela apresenta uma maior aproximação com aquela e uma nova forma de lidar com a alteridade dentro do arcabouço da abordagem rogeriana. Espera-se, com este trabalho, fomentar um maior diálogo e produção acerca do cuidado clínico e psicoterapêutico com a pessoa e o lugar oferecido para a alteridade na psicologia rogeriana.
18

Dvojí poetika autorského divadla: Semafor a Studio Ypsilon / Two poetics of author's theatre: Semafor and Studio Ypsilon

Baloušová, Lucie January 2016 (has links)
The diploma thesis focuses on small scene theaters which developed in the 1950s and represent a unique generational movement within the Czech cultural framework. This final project aims to describe the distinctive poetics of two of the Czech small theaters - the theatre Semafor and Studio Ypsilon. The description itself is based on the analysis of the original dramatic texts produced by their main representatives, Jiří Suchý and Jan Schmid. The thesis opens with the domain of the small scene theaters as such, its definition and characteristics. In order to provide a comprehensive perspective on the matter, the authorial theater and its specifics is further discussed. The main part of this thesis then concentrates on the origins of the two theaters, their profiles during the period of 1960s to 1990s and, eventually, their present form. Finally, despite the different conditions of existence of the two theaters, and the cultural, historical and political context, a comparison of the two poetics is proposed. KEYWORDS small scene theatre, author's theatre, theatre Semafor, Studio Ypsilon, Jiří Suchý, Jan Schmid, drama, dramatic text, poetics
19

Effect of Crystallography On Stress Corrosion Cracking Growth in Austenitic Stainless Steels

Haozheng Qu (9675506) 15 December 2020 (has links)
This thesis aims to reveal the correlation between stress corrosion cracking propagation behavior and Schmid and Taylor factor mismatch using EBSD analysis. <div><br></div><div>Chloride induced stress corrosion cracking (CISCC) is one of the most vulnerable weaknesses for the widely used austenitic stainless steel in many industries. The complex nature of CISCC involves mechanical, electrochemical, and microstructural perspectives. The objective of this thesis is to assess CISCC phenomenon in austenitic stainless steel from the mechanical and crystallographic perspective, specifically on the effect of local strain and stress and anisotropic plastic deformation. Austenitic stainless steel 304L test coupons are bent in four-point bending fixtures to obtain tensile stress for CISCC, followed by corrosion experiment in boiling magnesium chloride solution. Stress state of the sample is evaluated by finite element analysis (FEA) and X-ray Diffraction Crystallography (XRD) prior corrosion test. Cross section of the cracked region are analyzed with Electron Backscatter Diffraction (EBSD) to analyze the relationship between CISCC behaviors and crystallographic features in the sample. Schmid factor and Taylor factor are used to quantitatively evaluate CISCC initiation and propagation behavior. It is learned that in polycrystalline FCC stainless steel, mismatch of Schmid factor and Taylor factor values in adjacent grains along crack path governs CISCC propagation susceptibility and path selection. Crack propagation factor competition model is proposed based on observations from EBSD maps, incorporating Schmid factor and Taylor factor mismatch, electrochemical condition of crack tip, and anisotropic properties. <br></div>
20

Deformation Behaviour, Microstructure and Texture Evolution of CP Ti Deformed at Elevated Temperatures

Zeng, Zhipeng January 2009 (has links)
In the present work, deformation behavior, texture and microstructure evolution of commercially pure titanium (CP Ti) are investigated by electron backscattered diffraction (EBSD) after compression tests at elevated temperatures. By analysing work hardening rate vs. flow stress, the deformation behaviour can be divided into three groups, viz. three-stage work hardening, two-stage work hardening and flow softening. A new deformation condition map is presented, dividing the deformation behavior of CP Ti into three distinct zones which can be separated by two distinct values of the Zener-Hollomon parameter. The deformed microstructures reveal that dynamic recovery is the dominant deformation mechanism for CP Ti during hot working. It is the first time that the Schmid factor and pole figures are used to analyse how the individual slip systems activate and how their activities evolve under various deformation conditions. Two constitutive equations are proposed in this work, one is for single peak dynamic recrystallization (DRX), the other is specially for CP Ti deformed during hot working. After the hot compression tests, some stress-strain curves show a single peak, leading to the motivation of setting up a DRX model. However, the examinations of EBSD maps and metallography evidently show that the deformation mechanism is dynamic recovery rather than DRX. Then, the second model is set up. The influence of the deformation conditions on grain size, texture and deformation twinning is systematically investigated. The results show that {10-12} twinning only occurs at the early stage of deformation. As the strain increases, the {10-12} twinning is suppressed while {10- 11} twinning appears. Three peaks are found in the misorientation frequency-distribution corresponding to basal fiber texture, {10-11} and {10-12} twinning, respectively. A logZ-value of 13 is found to be critical for both the onset of {10-11} compressive twinning and the break point for the subgrain size. The presence of {10-11} twinning is the key factor for effectively reducing the deformed grain size. The percentage of low angle grain boundaries decreases with increasing Z-parameter, falling into a region separated by two parallel lines with a common slope and 10% displacement. After deformation, three texture components can be found, one close to the compression direction, CD, one 10~30° to CD and another 45° to CD. / QC 20100819

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