35,216 research outputs found

    Hidden Order in URu2Si2URu_2Si_2

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    We review current attempts to characterize the underlying nature of the hidden order in URu2Si2URu_2Si_2. A wide variety of experiments point to the existence of two order parameters: a large primary order parameter of unknown character which co-exists with secondary antiferromagnetic order. Current theories can be divided into two groups determined by whether or not the primary order parameter breaks time-reversal symmetry. We propose a series of experiments designed to test the time-reversal nature of the underlying primary order in URu2Si2URu_2Si_2 and to characterize its local single-ion physics

    Thermodynamics of Vortices in the Plane

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    The thermodynamics of vortices in the critically coupled abelian Higgs model, defined on the plane, are investigated by placing NN vortices in a region of the plane with periodic boundary conditions: a torus. It is noted that the moduli space for NN vortices, which is the same as that of NN indistinguishable points on a torus, fibrates into a CPN1CP_{N-1} bundle over the Jacobi manifold of the torus. The volume of the moduli space is a product of the area of the base of this bundle and the volume of the fibre. These two values are determined by considering two 2-surfaces in the bundle corresponding to a rigid motion of a vortex configuration, and a motion around a fixed centre of mass. The partition function for the vortices is proportional to the volume of the moduli space, and the equation of state for the vortices is P(A4πN)=NTP(A-4\pi N)=NT in the thermodynamic limit, where PP is the pressure, AA the area of the region of the plane occupied by the vortices, and TT the temperature. There is no phase transition.Comment: 17 pages, DAMTP 93-3

    Strategic Analyses of the National River Linking Project (NRLP) of India, Series 1. India’s water future: scenarios and issues

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    River basinsEnvironmental flowsDevelopment projectsWater requirementsIrrigated farmingWater demandFood demandGroundwater irrigationIrrigation efficiencyWater harvestingSupplemental irrigationWater productivityWater conservationDrip irrigationSprinkler irrigationRainfed farmingAgricultural policy

    Material Management: A Sustainable Way to Reduce the Wastage

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    In today’s world construction work are going at unexpected speed in all area like building, bridge, high-rise and so on. As we know there are two side of coin same way there are some disadvantage of this speedy construction which leads towards a wastage, like Material, Money, Time, and so on. One of the most important part of wastage is due to Improper Material Management. If we not prepare good management technic of material management than it convert in to wastage. It shall be very hard to manage wastage rather than managing the material. So if we want to manage the waste we need to manage the material in Proper Way. For that first of all we need to find out the importance of Phases of Material Management and Crucial Factors which affects the material management

    Ultrafast Magnetization Dynamics in Diluted Magnetic Semiconductors

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    We present a dynamical model that successfully explains the observed time evolution of the magnetization in diluted magnetic semiconductor quantum wells after weak laser excitation. Based on the pseudo-fermion formalism and a second order many-particle expansion of the exact p-d exchange interaction, our approach goes beyond the usual mean-field approximation. It includes both the sub-picosecond demagnetization dynamics and the slower relaxation processes which restore the initial ferromagnetic order in a nanosecond time scale. In agreement with experimental results, our numerical simulations show that, depending on the value of the initial lattice temperature, a subsequent enhancement of the total magnetization may be observed within a time scale of few hundreds of picoseconds.Comment: Submitted to PR

    Asymmetric MAP decoding for perpendicular magnetic recording

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    This paper presents the application of a new MAP algorithm to perpendicular recording in the presence of jitter noise
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