999 resultados para Knöbl, Wolfgang: Sozialtheorie : zwanzig einführende Vorlesungen


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Kirjallisuusarvostelu

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"Literaturverzeichnis": p. [455]-490.

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"Vorwort zur zweiten Auflage" dated 1911."

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v. 1. Die Ernährung der grünen Gewächse.--v. 2. pt. 1. Die Bodenkunde.--v. 2. pt. 2. Die Düngerlehre.--v. 3. Die Gärungschemie.--v. 4. Ernährung und Fütterung der Nutztiere in Zwanzig Vorlesungen.

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Includes index.

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Mode of access: Internet.

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Mode of access: Internet.

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We introduce a simple mean-field lattice model to describe the behavior of nematic elastomers. This model combines the Maier-Saupe-Zwanzig approach to liquid crystals and an extension to lattice systems of the Warner-Terentjev theory of elasticity, with the addition of quenched random fields. We use standard techniques of statistical mechanics to obtain analytic solutions for the full range of parameters. Among other results, we show the existence of a stress-strain coexistence curve below a freezing temperature, analogous to the P-V diagram of a simple fluid, with the disorder strength playing the role of temperature. Below a critical value of disorder, the tie lines in this diagram resemble the experimental stress-strain plateau and may be interpreted as signatures of the characteristic polydomain-monodomain transition. Also, in the monodomain case, we show that random fields may soften the first-order transition between nematic and isotropic phases, provided the samples are formed in the nematic state.

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Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Ciências Musicais – Musicologia Histórica