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Methods for predicting weld properties based on welding parameters are needed in friction stir welding (FSW). FSW is a joining process in which the resulting properties depend on the thermal cycle of the weld. Buckingham's Pi theorem and heat transfer analysis was used to identify dimensionless parameters relevant to the FSW process. Experimental data from Al 7075 and HSLA-65 on five different backing plate materials and a wide range of travel speeds and weld powers was used to create a dimensionless, empirical model relating critical weld parameters to the peak temperature rise and cooling rate of the weld. The models created have R-squared values greater than 0.99 for both dimensionless peak temperature rise and cooling rate correlations. The model can be used to identify weld parameters needed to produce a desired peak temperature rise or cooling rate. The model can also be used to explore the relative effects of welding parameters on the weld thermal response.

Nous étudions plusieurs propriétés fonctionnelles d'inconditionnalité en les exprimant à l'aide de multiplicateurs. La première partie est consacrée à l'étude de phénomènes d'inconditionnalité isométrique et presqu'isométrique dans les espaces de Banach séparables. Parmi ceux-ci, la notion la plus générale est celle de ``propriété d'approximation inconditionnelle métrique''. Nous la caractérisons parmi les espaces de Banach de cotype fini par une propriété simple d'``inconditionnalité par blocs''. En nous ramenant à des multiplicateurs de Fourier, nous étudions cette propriété dans les sous-espaces des espaces de Banach de fonctions sur le cercle qui sont engendrés par une suite de caractères $e^(int)$. Nous étudions aussi les suites basiques inconditionnelles isométriques et presqu'isométriques de caractères, en particulier les ensembles de Sidon de constante asymptotiquement 1. Nous obtenons dans chaque cas des propriétés combinatoires sur la suite. La propriété suivante des normes $L^p$ est cruciale pour notre étude: si $p$ est un entier pair, $\int |f|^p = \int (|f^(p/2)|)^2 = \sum |\widehat(f^(p/2))(n)|^2$ est une expression polynomiale en les coefficients de Fourier de $f$ et $\bar f$. Nous proposons d'ailleurs une estimation précise de la constante de Sidon des ensembles à la Hadamard. La deuxième partie étudie les multiplicateurs de Schur: nous caractérisons les suites basiques inconditionnelles isométriques d'entrées de matrice $e_(ij)$ dans la classe de Schatten $S^p$. Les propriétés combinatoires que nous obtenons portent sur les chemins dans le réseau $\N \times \N$ à sommets dans cet ensemble. La troisième partie étudie le rapport entre la croissance d'une suite d'entiers et les propriétés harmoniques et fonctionnelles de la suite de caractères associée. Nous montrons en particulier que toute suite polynomiale, ainsi que la suite des nombres premiers, contient un ensemble $\Lambda(p)$ pour tout $p$ qui n'est pas de Rosenthal.

O objetivo desta tese de doutorado é discutir se há um olhar judaico expresso em fotografias, produzidas no Brasil, por autores com ligações com o Judaísmo, e como ele se manifesta. A hipótese da pesquisa é que ele existe, mas, sem poder ser caracterizado por uma regra geral, deve ser encontrado na análise de casos singulares, considerando, por exemplo, como a estrangeridade dos autores se reflete em suas imagens. Para confirmar essa suposição, serão apresentadas a vida e interpretadas as obras de cinco fotógrafos, nascidos na Alemanha, exilados no Brasil em razão da ascensão do nazifascismo; quatro deles são judeus Alice Brill, Werner Haberkorn, Hans Gunter Flieg e Peter Scheier e uma casou-se com um judeu Hildegard Rosenthal. Todos registraram a cidade de São Paulo, sendo essas imagens o foco da análise, exceto no caso de Flieg, cujas fotos a serem estudadas serão as industriais, pois são as mais importantes de sua produção. Esses autores, de identidade híbrida, expressaram um olhar estrangeiro à realidade que retrataram, utilizando estilos modernos importados da Europa, tais como a Nova Visão, a Nova Objetividade e a Estética da Máquina, contribuindo, assim, enormemente, para inovar a fotografia brasileira. / The purpose of this doctoral thesis is to discuss whether there is a Jewish view expressed in photographs, produced in Brazil, by authors with links to Judaism, and how it manifests itself. The hypothesis of the research is that it exists, but, without being able to be characterized by a general rule, it must be found in the analysis of singular cases, considering, for example, how the authors\' estrangement is reflected in their images. In order to confirm this assumption, life will be presented and the works will be interpreted of five photographers, born in Germany, exiled in Brazil because of the rise of Nazism; four of them are Jewish Alice Brill, Werner Haberkorn, Hans Gunter Flieg and Peter Scheier and one married to a Jew Hildegard Rosenthal. All registered the city of São Paulo, being these images the focus of the analysis, except in the case of Flieg, whose photos to be studied will be the industrial ones, since they are the most important of his production. These authors, with a hybrid identity, expressed a foreign look at the reality they portrayed, using modern styles imported from Europe, such as the New Vision, New Objectivity and Machine Aesthetics, contributing enormously, thus, to innovate Brazilian photography.

O objetivo desta tese de doutorado é discutir se há um olhar judaico expresso em fotografias, produzidas no Brasil, por autores com ligações com o Judaísmo, e como ele se manifesta. A hipótese da pesquisa é que ele existe, mas, sem poder ser caracterizado por uma regra geral, deve ser encontrado na análise de casos singulares, considerando, por exemplo, como a estrangeridade dos autores se reflete em suas imagens. Para confirmar essa suposição, serão apresentadas a vida e interpretadas as obras de cinco fotógrafos, nascidos na Alemanha, exilados no Brasil em razão da ascensão do nazifascismo; quatro deles são judeus Alice Brill, Werner Haberkorn, Hans Gunter Flieg e Peter Scheier e uma casou-se com um judeu Hildegard Rosenthal. Todos registraram a cidade de São Paulo, sendo essas imagens o foco da análise, exceto no caso de Flieg, cujas fotos a serem estudadas serão as industriais, pois são as mais importantes de sua produção. Esses autores, de identidade híbrida, expressaram um olhar estrangeiro à realidade que retrataram, utilizando estilos modernos importados da Europa, tais como a Nova Visão, a Nova Objetividade e a Estética da Máquina, contribuindo, assim, enormemente, para inovar a fotografia brasileira. / The purpose of this doctoral thesis is to discuss whether there is a Jewish view expressed in photographs, produced in Brazil, by authors with links to Judaism, and how it manifests itself. The hypothesis of the research is that it exists, but, without being able to be characterized by a general rule, it must be found in the analysis of singular cases, considering, for example, how the authors\' estrangement is reflected in their images. In order to confirm this assumption, life will be presented and the works will be interpreted of five photographers, born in Germany, exiled in Brazil because of the rise of Nazism; four of them are Jewish Alice Brill, Werner Haberkorn, Hans Gunter Flieg and Peter Scheier and one married to a Jew Hildegard Rosenthal. All registered the city of São Paulo, being these images the focus of the analysis, except in the case of Flieg, whose photos to be studied will be the industrial ones, since they are the most important of his production. These authors, with a hybrid identity, expressed a foreign look at the reality they portrayed, using modern styles imported from Europe, such as the New Vision, New Objectivity and Machine Aesthetics, contributing enormously, thus, to innovate Brazilian photography.

In this thesis we present an extensive characterization of weak* sequentially precompact subsets of the dual of a sequentially order complete M-space with an order unit. This central part of the thesis generalizes results due to H.H. Schaefer and X.D. Zhang showing that small weak* compact subsets of the dual of a space of bounded measurable real-valued functions (continuous real-valued functions on a compact quasi-Stonian space) are weakly compact. Moreover, while the proofs of Schaefer and Zhang use measure theoretical arguments, the arguments presented here are purely elementary and are based on the well-known result, that the space l1 has the Schur property. Finally some applications are given. For example, we investigate compact or sequentially precompact subsets, which consist of order-weakly compact operators, in the space of continuous linear operators defined on a sequentially order complete Riesz space with values in a Banach space provided with the strong operator topology: as an immediate consequence of the results, we can easily deduce extended versions of the Vitali-Hahn-Saks theorem for vector measures. For this we need a generalization of the Yosida-Hewitt decomposition theorem, which is proved here with other techniques like the factorization of an order-weakly compact operator through a Banach lattice with order continuous norm.

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Die Planungsregion Leipzig-Westsachsen gehört mit ca. 252 Einwohnern pro Quadratkilometer zu den am dichtesten besiedelten Gebieten in Mitteldeutschland. Wie in vielen anderen Regionen auch haben die zu Beginn der 1990er-Jahre einsetzenden wirtschaftlichen, politischen und gesellschaftlichen Veränderungen ihre Spuren in der bebauten Umwelt hinterlassen: Viele der vormals staatlichen Industrie-, Gewerbe- und Handelsunternehmen konnten nicht erhalten werden, was das Aufgeben zahlreicher Grundstücke, Gebäude und Anlagen nach sich zog.