4,245 research outputs found

    Book Review: The Winding-Up of Insolvent Companies in England and France

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    Livadas provides an especially adept analysis and comparison of the treatment of employees of insolvent companies in the two countries. The author convincingly demonstrates that a French liquidation des biens protects employee wages, benefits, and claims more extensively than an English winding-up proceeding. The French requirement of compulsory insurance to protect the wages of employees and the special privilege afforded employees against the immovable assets of a French company are without analogy in English winding-up law. Livadas punctuates the chapters on the liabilities of officers and directors, which are generally more strict in France than in England, and the priorities of distribution of assets with incomprehensible mathematical examples, complete to two decimal places. The author\u27s conclusion, contained in a scant one and one-half pages at the end of this 400-page text, cry out for expansion. Several of his conclusory points have been previously mentioned only in passing, and at obscure junctures of the text. The reader senses that this author may have had many interesting observations to share but failed to present them. Livadas obviously has developed an intimate and profound understanding of his subject, but has cluttered the broad framework of this work with so much minutiae that the finished product is almost impenetrable

    Circularly polarized waves in a plasma with vacuum polarization effects

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    The theory for large amplitude circularly polarized waves propagating along an external magnetic field is extended in order to include also vacuum polarization effects. A general dispersion relation, which unites previous results, is derived.Comment: 5 pages (To appear in Physics of Plasmas

    Odin observations of ammonia in the Sgr A +50 km/s Cloud and Circumnuclear Disk

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    Context. The Odin satellite is now into its sixteenth year of operation, much surpassing its design life of two years. One of the sources which Odin has observed in great detail is the Sgr A Complex in the centre of the Milky Way. Aims. To study the presence of NH3 in the Galactic Centre and spiral arms. Methods. Recently, Odin has made complementary observations of the 572 GHz NH3 line towards the Sgr A +50 km/s Cloud and Circumnuclear Disk (CND). Results. Significant NH3 emission has been observed in both the +50 km/s Cloud and the CND. Clear NH3 absorption has also been detected in many of the spiral arm features along the line of sight from the Sun to the core of our Galaxy. Conclusions. The very large velocity width (80 km/s) of the NH3 emission associated with the shock region in the southwestern part of the CND may suggest a formation/desorption scenario similar to that of gas-phase H2O in shocks/outflows.Comment: 5 pages, 3 figures, 3 table

    Impurity-induced dephasing of Andreev states

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    A study is presented concerning the influence of flicker noise in the junction transparency on coherent transport in Andreev states. The amount of dephasing is estimated for a microwave-activated quantum interferometer. Possibilities of experimentally investigating the coupling between a superconducting quantum point contact and its electromagnetic environment are discussed.Comment: 8 pages, 4 figure

    Short wavelength quantum electrodynamical correction to cold plasma-wave propagation

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    The effect of short wavelength quantum electrodynamic (QED) correction on plasma-wave propagation is investigated. The effect on plasma oscillations and on electromagnetic waves in an unmagnetized as well as a magnetized plasma is investigated. The effects of the short wavelength QED corrections are most significant for plasma oscillations and for extraordinary modes. In particular, the QED correction allow plasma oscillations to propagate, and the extra-ordinary mode looses its stop band. The significance of our results is discussed.Comment: 12 pages, 5 figure

    Poisson equation and self-consistent periodical Anderson model

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    We show that the formally exact expression for the free energy (with a non-relativistic Hamiltonian) for the correlated metal generates the Poisson equation within the saddle-point approximation for the electric potential, where the charge density automatically includes correlations. In this approximation the problem is reduced to the self-consistent periodical Anderson model (SCPAM). The parameter of the mixing interaction in this formulation have to be found self-consistently together with the correlated charge density. The factors, calculated by Irkhin, for the mixing interaction, which reflect the structure of the many-electron states of the \f-ion involved, arise automatically in this formulation and are quite sensitive to the specific element we are interested in. We also discuss the definitions of the mixing interaction for the mapping from ab initio to model calculations.Comment: 25 pages, no figure
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