3,788 research outputs found

    Lorentzian Wormholes in the Friedman-Robertson-Walker Universe

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    The metric of some Lorentzian wormholes in the background of the FRW universe is obtained. It is shown that for a de Sitter space-time the new solution is supported by Phantom Energy. The wave equation for a scalar field in such backgrounds is separable. The form of the potential for the Schr\"{o}dinger type one dimensional wave equation is found.Comment: 7 page

    Charged Particle Dynamics in the Field of a Slowly Rotating Compact Star

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    We study the dynamics of a charged particle in the field of a slowly rotating compact star in the gravitoelectromagnetic approximation to the geodesic equation . The star is assumed to be surrounded by an ideal, highly conducting plasma (taken as a magnetohydrodynamic fluid) with a stationary, axially symmetric electromagnetic field. The general relativistic Maxwell equations are solved to obtain the effects of the background spacetime on the electromagnetic field in the linearized Kerr spacetime. The equations of motion are then set up and solved numerically to incorporate the gravitational as well as the electromagnetic effects. The analysis shows that in the slow rotation approximation the frame dragging effects on the electromagnetic field are absent. However the particle is directly effected by the rotating gravitational source such that close to the star the gravitational and electromagnetic field produce contrary effects on the particle's trajectory.Comment: 10 pages, 6 figures in B & W PostScript Forma

    Law Politics of 2009’s Presidential Election Act

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    Normatively, an act, in whatever form in may be, shall be based on the orientation for the the people benefit and to ascertainment of the justice for people. The politics of law of presidential election issued by the relevant body is considered to be conservative and tends to be elitical. On theother hand, the success of Indonesia to exit fron the transition of democracy is determined by the lagal policiy of the govenrment. Through the issuance of act on Presidential election which is responsive,Ă‚ a better and more democratic new president may be ekected

    Politik Hukum Undang-Undang Pemilihan Presiden 2009

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    Normatively, an act, in whatever form in may be, shall be based on the orientation for the the people benefit and to ascertainment of the justice for people. The politics of law of presidential election issued by the relevant body is considered to be conservative and tends to be elitical. On theother hand, the success of Indonesia to exit fron the transition of democracy is determined by the lagal policiy of the govenrment. Through the issuance of act on Presidential election which is responsive, a better and more democratic new president may be ekected

    Tingkat Kedinamisan Kelompok Wanita Tani dalam Mendukung Keberlanjutan Usaha Tanaman Obat Keluarga di Kabupaten Bogor, Jawa Barat

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    Penelitian ini bertujuan menganalisis tingkat dinamika kelompok mendukung keberlanjutan USAha tanaman obat keluarga dan menganalisis faktor-faktor kedinamisan kelompok yang berhubungan nyata dengan keberlanjutan USAha tanaman obat keluarga. Penelitian lapang dilakukan di Kelompok wanita tani Benteng Sejahtera dan Puring Desa Benteng Kecamatan Ciampea dan Kelompok wanita tani Anggrek Desa Babakan Kecamatan Dramaga Kabupaten Bogor mulai Agustus sampai dengan Oktober 2016. Populasi penelitian yaitu 62 orang yang mengembangkan USAha tanaman obat keluarga. Hasil penelitian ini yaitu 1) kelompok dalam mendukung keberlanjutan USAha tanaman obat keluarga secara keseluruhan cukup dinamis. 2) faktor-faktor yang berhubungan dengan keberlanjutan USAha tanaman obat keluarga diantaranya tingkat pendapatan keluarga berhubungan nyata negatif dengan aspek sosial, intensitas penyuluhan berhubungan nyata negatif dengan aspek sosial, keefektifan berhubungan nyata negatif dengan aspek sosial, maksud terselubung berhubungan nyata dengan aspek ekonomi

    Generalized relation between the relative entropy and dissipation for nonequilibrium systems

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    Recently, Kawai, Parrondo, and Van den Broeck have related dissipation to time-reversal asymmetry. We generalized the result by considering a protocol where the physical system is driven away from an initial thermal equilibrium state with temperature β0\beta_0 to a final thermal equilibrium state at a different temperature. We illustrate the result using a model with an exact solution, i.e., a particle in a moving one-dimensional harmonic well.Comment: 4 page
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