7,940 research outputs found
The Effects of Minimal Length, Maximal Momentum and Minimal Momentum in Entropic Force
In this paper, the modified entropic force law is studied by using a new kind
of generalized uncertainty principle which contains a minimal length, a minimal
momentum and a maximal momentum. Firstly, the quantum corrections to the
thermodynamics of a black hole is investigated. Then, according to Verlinde's
theory, the generalized uncertainty principle (GUP) corrected entropic force is
obtained. The result shows that the GUP corrected entropic force is related not
only to the properties of the black holes, but also to the Planck length and
the dimensionless constants and . Moreover,
based on the GUP corrected entropic force, we also derive the modified
Einstein's field equation (EFE) and the modified Friedmann equation.Comment: 16 pages. arXiv admin note: substantial text overlap with
arXiv:1604.0470
Ethyl 3-[2-(p-tolylcarbamothioyl)hydrazinylidene]butanoate
The title compound, C14H19N3O2S, was obtained from a condensation reaction of N-(p-tolyl)hydrazinecarbothioamide and ethyl acetoacetate. The molecule assumes an E configuration; the thiosemicarbazide and ester groups are located on the opposite sides of the C=N bond. The almost planar thiosemicarbazide unit (r.m.s. deviation = 0.0130 Å) is tilted at a dihedral angle of 49.54 (12)° with respect to the benzene ring. Intermolecular N—H⋯N and N—H⋯S hydrogen bonding stabilizes the crystal structure. The ethoxy group of the ester unit is disordered over two positions, with a site-occupancy ratio of 0.680 (10):0.320 (10)
Ethyl 4-hydroxy-6-(4-hydroxyphenyl)-4-trifluoromethyl-2-sulfanylidene-1,3-diazinane-5-carboxylate ethanol monosolvate
The title compound, C14H15F3N2O4S·C2H5OH, was prepared by reaction of 4-hydroxybenzaldehyde, ethyl 4,4,4-trifluoro-3-oxobutanoate and thiourea. The hexahydropyrimidine ring adopts a half-chair conformation, the mean plane formed by the ring atoms excluding the C atom bonded to the ethoxycarbonyl group has an r.m.s. deviation of 0.0333 Å, and the dihedral angle between this plane and the benzene ring is 56.76 (5)°. The molecular conformation is stabilized by an intramolecular O—H⋯O hydrogen bond, generating an S(6) ring. The crystal structure is stabilized by intermolecular O—H⋯O, O—H⋯S, N—H⋯O and N—H⋯S hydrogen bonds. The ethyl group of the ester unit is disordered over two positions, with an occupancy ratio of 0.757 (10):0.243 (10)
Structural and Chemical Orders in Ni64.5Zr35.5 Metallic Glass by Molecular Dynamics Simulation
The atomic structure of Ni64.5Zr35.5 metallic glass has been investigated by
molecular dynamics (MD) simulations. The calculated structure factors from the
MD glassy sample at room temperature agree well with the X-ray diffraction
(XRD) and neutron diffraction (ND) experimental data. Using the pairwise
cluster alignment and clique analysis methods, we show that there are three
types dominant short-range order (SRO) motifs around Ni atoms in the glass
sample of Ni64.5Zr35.5, i.e., Mixed-Icosahedron(ICO)-Cube, Twined-Cube and
icosahedron-like clusters. Furthermore, chemical order and medium-range order
(MRO) analysis show that the Mixed-ICO-Cube and Twined-Cube clusters exhibit
the characteristics of the crystalline B2 phase. Our simulation results suggest
that the weak glass-forming ability (GFA) of Ni64.5Zr35.5 can be attributed to
the competition between the glass forming ICO SRO and the crystalline
Mixed-ICO-Cube and Twined-Cube motifs
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