716 research outputs found
Zur Kinematik eines stochastischen Feldes interner Wellen in einer Scherströmung
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Zur Kinematik eines stochastischen Feldes interner Wellen in einer Scherströmung.
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Peters, Hartmut (1981) Zur Kinematik eines stochastischen Feldes interner Wellen in einer Scherströmung. (Doctoral thesis/PhD), Christian-Albrechts-Universität Kiel, Kiel, Germany, 118 pp.
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Abstract
Für die im Atlantik im Bereich des Äquatorialen Gegenstroms während GATE beobachtete mittlere Schichtung und Scherströmung werden vertikale Eigenschwingungen (Moden) und Dispersionskurven hochfrequenter (0.3 bis 15 cph) interner Wellen berechnet. Ein spektrales Modell der Kinematik freier, linearer interner Wellen wird durch die stochastische Überlagerung so gewonnener Moden erzeugt. Modellrechnungen werden zu Vergleichs- und Testzwecken für einfache Grundzustände (N 2 = const.; u = const.) durchgeführt. Die den Verhältnissen während GATE entsprechenden Rechnungen ergeben folgende Resultate: In den Energiespektren wird eine Schulter bei Frequenzen zwischen 1.5 und 4 cph beobachtet, die einen nicht unbeträchtlichen Teil der Gesamtenergie des Wellenfeldes repräsentiert.
Diese Schulter kann im wesentlichen nicht durch kinematische Effekte erklärt werden, sie muß dynamische Ursachen haben. Im Frequenzbereich 1.5 bis 4 cph wird das Wellenfeld praktisch ausschließlich von der ersten Mode beherrscht. Nach den Beobachtungen sind die Wellen überwiegend gegen die mittlere Strömung gerichtet. Zur Erklärung dessen müssen sowohl dynamische als auch kinematische Effekte herangezogen werden. Das beobachtete Maximum der Kohärenz zwischen Strömung in der Deckschicht und Temperatur in der Sprungschicht zwischen 1. 5 und 4 cph ist prinzipiell der Kinematik des Systems zuzuschreiben. Die Skalen des Wellenzahlspektrums, die sich aus der Anpassung des Modells an die Daten ergeben, sind derart, daß nur ein Teil der Anisotropie des Systems von Moden und Dispersionskurven wirksam wird. Die Vertikalstruktur der beobachteten Strömungsfluktuationen kann mit dem Modell nicht vollständig beschrieben werden. Das Modell wird kritisch diskutiert
Zum Verhältnis von Arbeit und Gesellschaftskritik in Hartmut Rosas kritischer Soziologie
No full textHaubner T. Auf der Suche nach Dingresonanz. In: Peters CH, Schulz P, eds. Resonanzen und Dissonanzen. Hartmut Rosas kritische Theorie in der Diskussion. Sozialtheorie. Bielefeld, Germany: transcript Verlag; 2017: 217-232.Hartmut Rosa hat in seinen neueren Arbeiten den Begriff der Resonanz als Gegenbegriff und Lösungsvorschlag für das gesellschaftliche Problem der Beschleunigung ausgearbeitet. Resonanz ist dabei das ebenso analytische wie normative Fundament seiner kritischen Theorie. Die Beiträge des Bandes wollen die interdisziplinäre Diskussion um diesen Begriff eröffnen, indem sie ihn ausgehend von unterschiedlichen Perspektiven in der Soziologie und Sozialphilosophie in den Blick nehmen. In seinem Reply erhält Rosa deshalb selbst die Möglichkeit, auf die Diskussion zu reagieren. Der Sammelband leistet sowohl eine Einführung und Diskussion des Resonanzbegriffs als auch eine vertiefende kritische Analyse gegenwärtiger sozialwissenschaftlicher Schlüsselbegriffe.In his new work, Hartmut Rosa has developed the concept of resonance as a counter-term and potential solution for the social problem of acceleration. In this way, resonance is equally the analytical and normative basis of his critical theory. The contributions in this volume seek to open interdisciplinary discussions around this concept, considering it from a range of different perspectives. The anthology provides both an introduction to, and discussion of, the concept of resonance, as well as an in-depth critical analysis of other key concepts in contemporary social science discourse
Multiple sclerosis and the intestine: Chasing the microbial offender
No full textMultiple sclerosis (MS) affects more than 2.8 million people worldwide but the distribution is not even. Although over 200 gene variants have been associated with susceptibility, studies of genetically identical monozygotic twin pairs suggest that the genetic make-up is responsible for only about 20%-30% of the risk to develop disease, while the rest is contributed by milieu factors. Recently, a new, unexpected player has entered the ranks of MS-triggering or facilitating elements: the human gut microbiota. In this review, we summarize the present knowledge of microbial effects on formation of a pathogenic autoreactive immune response targeting the distant central nervous system and delineate the approaches, both in people with MS and in MS animal models, which have led to this concept. Finally, we propose that a tight combination of investigations of human patients with studies of suitable animal models is the best strategy to functionally characterize disease-associated microbiota and thereby contribute to deciphering pathogenesis of a complex human disease
Fritz Schumacher & Heinrich Tessenow: Architecture, an Art or a Craft?
No full textThis booklet contains the inaugural lectures of Fritz Schumacher and Heinrich Tessenow given on the occasion of their appointment respectively as professors at the Technical University in Dresden and The Art Academy in Dresden.The lectures provide novel insights into their understanding of architecture and into their proposals for reform of architectural education. they are proceeded by an introductory essay of the guest editor architectural historian Hartmut Frank.History, Form & Aesthetic
Sociedades modernas, sociedades de obsolescência: a sociologia temporal de Hartmut Rosa / Modern societies, obsolescence societies: Hartmut Rosa's temporal sociology
No full textResenha de: ROSA, Hartmut. Aceleração: a transformação das estruturas temporais na modernidade. São Paulo: Editora Unesp, 2019. Centrado na revisitação da modernidade a partir de uma perspectiva temporal, Hartmut Rosa sustenta o conceito de aceleração social como aspecto fundante do projeto moderno. Explorando diferentes variáveis causais para o conceito da aceleração social, a resenha examina as transformações das instituições morais, valorativas e políticas ocorridas ao longo do desenvolvimento histórico da modernidade como episódios induzidos pela obsolescência. Sendo esta um produto de campos de ação crescentemente cambiantes e acelerados, o autor mobiliza esse conceito para fundamentar inédita proposta de diferenciação entre a modernidade e a modernidade tardia como momentos históricos calcados em diferentes níveis de compressão espaço-temporal, estabilidade institucional e temporalização de projetos individuais e coletivos de futuro.***AbstractCentered on revisiting modernity from a temporal perspective, Hartmut Rosa supports the concept of social acceleration as a fundamental aspect of the modern project. Exploring different causal variables for the concept of social acceleration, the review examines the transformations of moral, valuative and political institutions that occurred during the historical development of modernity as episodes induced by obsolescence. As this is a product of increasingly changing and accelerated fields of action, the author mobilizes this concept to substantiate an unprecedented proposal for differentiation between modernity and late modernity as historical moments based on different levels of space-time compression, institutional stability and temporalization of individual and collective future projects
Jogo de empresas e a formação de líderes empresariais
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.Neste trabalho é realizado um levantamento, análise e reflexão das teorias relacionadas aos temas: - liderança de pessoas no contexto das organizações; - programas formadores de executivos e suas relações com os aspectos humanos; - o universo de pesquisas dos jogos de empresas e a simulação de aspectos relacionados às questões humanas. Diante do resultado deste levantamento, são investigadas metodologias, técnicas e práticas destinadas à liderança de pessoas, que atendam as características de um ambiente simulado, com possibilidade de modelagem. Com base na pesquisa teórica foram feitas proposições de um processo e de técnicas de liderança de pessoas e o desenvolvimento de um novo módulo no jogo de empresas GI-Micro que possibilite aos participantes exercitar determinadas habilidades e competências relacionadas à função de líder nas organizações. A incorporação do novo módulo no GI-Micro busca atender a alguns requisitos básicos, tais como: - instigar nos participantes o uso eficaz da liderança no ambiente organizacional, desafiando-os a tomar decisões específicas que objetivam obter melhor performance de produtividade da mão de obra; - compatibilizar o ambiente do jogo ao exercício de ferramentas contemporâneas de avaliação de desempenho; - proporcionar aos participantes do jogo um ambiente de simulação empresarial com tarefas equilibradas e atualizadas às boas práticas da gestão empresarial
Surveying silk fibre degradation by crystallinity determination: a study on the Tang-Dynasty silk treasure from Famen Temple, China
No full textWhen Chinese archaeologists opened an unknown vault under the collapsed pagoda of Famen Temple near Xian (Shaanxi Province, NW China) in 1987, they found a vast amount of valuable silk textiles. The degraded textiles were part of a treasure comprising hundreds of artifacts deposited by Tang dynasty (ad 618–907) emperors as a gift to the temple. Run as a bilateral German-Chinese project, the Roemisch-Germanisches Zentralmuseum Mainz established a textile conservation laboratory in Shaanxi´s provincial capital Xian in 2001, joining numerous other laboratories that have existed there since the early 1990s.This preliminary study represents part of an ongoing investigation programme that accompanies the conservation work. The Tang dynasty silk is generally in a very poor state of preservation as a result of its long burial period. Large sections have only survived as an amorphous brown mass of fibre debris. Some parts are better preserved, however, offering the unique opportunity to study the whole range of degradation stages on ancient silks.This preliminary scientific investigation focuses on the determination of the silk fibres’ crystallinity and its relation to the ageing process. As we know from modern material, silk is mainly crystalline, albeit in a somewhat amorphous state. The methods of investigation used were X-ray diffraction (XRD) using synchrotron radiation, which is a new way to determine crystallinity of ancient silk fibres; and polarized Fourier transform infrared spectroscopy (FTIR) for the determination of crystallite orientation. Both methods were specifically devised to gain information on small single fibres
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