2,806 research outputs found

    Description and capabilities of a traveling wave sonic boom simulator

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    Description and capabilities of traveling wave sonic boom simulator

    The Yoneda isomorphism commutes with homology

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    We show that, for a right exact functor from an abelian category to abelian groups, Yoneda's isomorphism commutes with homology and, hence, with functor derivation. Then we extend this result to semiabelian domains. An interpretation in terms of satellites and higher central extensions follows. As an application, we develop semiabelian (higher) torsion theories and the associated theory of (higher) universal (central) extensions.Comment: Fixed an inaccuracy in (3.6

    Absolute beam position monitoring using HOM-damper signals

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    To preserve the required beam quality in an e+/e- collider it is necessary to have a very precise beam position control at each accelerating cavity. An elegant method to avoid additional length and beam disturbance is the usage of signals from existing HOM-dampers. The magnitude of the displacement is derived from the amplitude of a dipole mode whereas the sign follows from the phase comparison of a dipole and a monopole HOM. To check the performance of the system, a measurement setup has been built with an antenna which can be moved with micrometer resolution to simulate the beam. Furthermore we have developed a signal processing to determine the absolute beam displacement. Measurements on the HOM-damper cell can be done in the frequency domain using a network analyser. Final measurements with the nonlinear time dependent signal processing circuit has to be done with very short electric pulses simulating electron bunches. Thus, we have designed a sub nanosecond pulse generator using a clipping line and the step recovery effect of a diode. The measurement can be done with a resolution of about 10 micrometers. Measurements and numerical calculations concerning the monitor design and the pulse generator are presented

    Localizing groups with action

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    When localizing the semidirect product of two groups, the effect on the factors is made explicit. As an application in Topology, we show that the loop space of a based connected CW-complex is a P-local group, up to homotopy, if and only if π1X and the free homotopy groups [S k-1, ΩX], k ≥ 2, are P-local

    Synthesis and characterization of rare-earth oxide transition-metal arsenides and selenides

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    Die rezeption der "Antimémoires" von André Malraux in der Franzosischen Kommunistischen presse

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    André Malraux publicó en septiembre de 1967 sus Antimémoires. Este libro fue seguido por la prensa como "acontecimiento político" y/o clasificado como "acontecimiento de la reentrada literaria". Las Antimémoires alcanzaron una gran publicidad, al igual que su autor, en la misma medida, en la televisión y en emisiones, así como entrevistas en las que hizo clamorosos discursos, que fueron motivo de críticas.André Malraux published in September 1967his Antimémoires. This book was followed by the press as "political event" and/or classified as "event of the literary reentry". The Antimémoires reached a great advertising, as well as its author, to the same extent, in television and animations, as well as interviews in which made clamorous speeches, that were motif of criticism.Als André Malraux im September 1967 seine Antimémoires veriiffentlichte, wurde dieses Buch sogleich von der franzósischen Presse als «événement politique» und/oder als «événement de la rentrée littéraire» eingestuft. Die Antimémoires erreichten eine ungeheuerliche Publizitát; in gleichem Maße jedoch auch der Autor, der in Fernseh— und Rundfunksendungen sowie in Zeitungsinterviews lautstark von sich reden machte, die wiederum Anlaß für Kritiken und Kommentare waren.notPeerReviewe

    Alfred Doblin und seine reise nach Polen

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    Entre septiembre y noviembre de 1924 Alfred Doblin emprendió un viaje de aproximadamente dos meses a Polonia, a partir del que surge el libro "Reise in Polen". Se pone en evidencia que, cualquier persona que viaje hoy al nuevo Estado de Polonia puede ver que la nación polaca, abofeteada y perseguida, ha vuelto a nacer tras la II Guerra Mundial.In 1924, between September and November, Alfred Doblin undertook a journey of about two months to Poland. From this experience, the book "Reise in Polen" arises. It shows that, anyone traveling today around the new State of Poland can see that the Polish, slapped and persecuted nation, reborn after World War II
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