999 resultados para Weininger, Otto


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Thesis (doctoral)--Friedrich-Wilhelms-Universitat zu Berlin.

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Thesis (doctoral)--K. Bayer. Ludwig-Maximilians-Universitat Munchen.

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Cover title.

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Includes index.

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A coloring book.

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Mode of access: Internet.

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À travers leurs premiers écrits des années 50 et 60, Frei Otto, architecte et ingénieur allemand (1925-2015), et René Sarger (1917-1988), architecte français, n’expriment pas seulement une passion partagée des toitures suspendues. Partant du même souci d’une forme structurale « juste », leurs convictions radicales révèlent aussi les premiers questionnements des nouveaux rôles de l’ingénieur et de l’architecte de l’époque, mais aussi des idéaux opposés concernant leur position comme concepteurs et auteurs du monde bâti, ainsi que l’importance sociétale de leurs disciplines.

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We study a quantum Otto engine operating on the basis of a helical spin-1/2 multiferroic chain with strongly coupled magnetic and ferroelectric order parameters. The presence of a finite spin chirality in the working substance enables steering of the cycle by an external electric field that couples to the electric polarization. We observe a direct connection between the chirality, the entanglement and the efficiency of the engine. An electric-field dependent threshold temperature is identified, above which the pair correlations in the system, as quantified by the thermal entanglement, diminish. In contrast to the pair correlations, the collective many-body thermal entanglement is less sensitive to the electric field, and in the high temperature limit converges to a constant value. We also discuss the correlations between the threshold temperature of the pair entanglement, the spin chirality and the minimum of the fidelities in relation to the electric and magnetic fields. The efficiency of the quantum Otto cycle shows a saturation plateau with increasing electric field amplitude.