20,576 research outputs found

    SWKB Quantization Rules for Bound States in Quantum Wells

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    In a recent paper by Gomes and Adhikari (J.Phys B30 5987(1997)) a matrix formulation of the Bohr-Sommerfield quantization rule has been applied to the study of bound states in one dimension quantum wells. Here we study these potentials in the frame work of supersymmetric WKB (SWKB) quantization approximation and find that SWKB quantization rule is superior to the modified Bohr-Sommerfield or WKB rules as it exactly reproduces the eigenenergies.Comment: 8 page

    Internal relaxation time in immersed particulate materials

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    We study the dynamics of the solid to liquid transition for a model material made of elastic particles immersed in a viscous fluid. The interaction between particle surfaces includes their viscous lubrication, a sharp repulsion when they get closer than a tuned steric length and their elastic deflection induced by those two forces. We use Soft Dynamics to simulate the dynamics of this material when it experiences a step increase in the shear stress and a constant normal stress. We observe a long creep phase before a substantial flow eventually establishes. We find that the typical creep time relies on an internal relaxation process, namely the separation of two particles driven by the applied stress and resisted by the viscous friction. This mechanism should be relevant for granular pastes, living cells, emulsions and wet foams

    Position-dependent-mass; Cylindrical coordinates, separability, exact solvability, and PT-symmetry

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    The kinetic energy operator with position-dependent-mass in cylindrical coordinates is obtained. The separability of the corresponding Schr\"odinger equation is discussed within radial cylindrical mass settings. Azimuthal symmetry is assumed and spectral signatures of various z-dependent interaction potentials (Hermitian and non-Hermitian PT-symmetric) are reported.Comment: 16 page

    The efficiency of Leguminoceae Production Grains Plus Maize as A Feeding on Growth Phase of Local Swine (Potamochoerus porcus) in Timor-Leste

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    In Timor Leste, swine Farmers did not yet use legume production grains to maintain feed swine performance and respond to market demand. The research aims to evaluate the Efficiency of Leguminoceae Production grains Plus Maize in feeding on the Growth Phase of Local Swine in Timor Leste. This research used Latin Square Design with four rows and four columns employed. The swine feeding has 4 treatments such as R1 (corn 50% + mungbean 15% + soybean 20% + common bean 15%), R2 (corn 40% + mungbean 20% + soybean 15% + common bean 25%), R3 (corn 40% + mungbean 20% + soybean 20% + common bean 20%), R4 (corn 50% + mungbean 10% + soybean 15% + common bean 25%). This research showed that Swine that consumed R2 rates were very good compared to other feedings for Swine. Look at the performance of the Swine with an increase in body weight of 31.16kg and body length of 72.75cm in the grower phase. All data were analyzed by ANOVA Latin Square Design, and Least Significance Difference (LSD) was conducted when the means were significantly different (p<0.05)
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