نتایج جستجو برای: crystal lattice
تعداد نتایج: 244411 فیلتر نتایج به سال:
We present an axisymmetric lattice Boltzmann model based on the Kupershtokh et al. multiphase model that is capable of solving liquid-gas density ratios up to 10. Appropriate source terms are added to the lattice Boltzmann evolution equation to fully recover the axisymmetric multiphase conservation equations. We validate the model by showing that a stationary droplet obeys the Young-Laplace law...
crystalline antimony sulfide (sb2s3) with nanorods morphology was successfully prepared via hydrothermal method by the reaction of elemental sulfur, antimony and iodine as starting materials with high yield at 180°c for 24h.using oxidation reagents like iodine as an initiator of redox reaction to prepare sb2s3 is reported for first time. crystal growth of sb2s3 was done by increasing reaction t...
Crystal structure prediction for organic molecules requires both the fast assessment of thousands to millions of crystal structures and the greatest possible accuracy in their relative energies. We describe a crystal lattice simulation program, DMACRYS, emphasizing the features that make it suitable for use in crystal structure prediction for pharmaceutical molecules using accurate anisotropic ...
The Crystal Structure of I H ~ )CH2 COC(>Hs has been determined by direct method (Sir). The dimensions of used cry:,tal were 0.7 x 0.3 x 0.2 mm. TIle molecular structure has been determined by MolEN program. This compound crystalizc.s in monoclinic space group P2t /n (14) with four molecules per unit cell. Lattice parameters of this ...
[Cd(NO)z(u rea)4J was synthesized by reaction of cadmium nitrate and urea under certain conditions. The dimensions of used crystal were O.47xO.40x0.58 mm. The molecular structure has been determined by SHELX-86 program. This complex crystalizes in monoclinic space group P2}/a with two molecules per uni. cell. Lattice parameters of this compound are: a~7.6060 A b~12.7740 A c~9.0370 A P~ll...
We study the focusing properties of a two dimensional complex square-lattice photonic crystal (PC) comprising air holes immersed in Ge medium. The finite difference time domain (FDTD) method is utilized to calculate the dispersion band diagram and to simulate the image formation incorporating the perfectly matched layer (PML) boundary condition. In contrast to the common square PCs with the sam...
A crystal plasticity finite element method (CPFEM) model has been developed to investigate the mechanical properties and micro-texture evolution of single-crystal aluminum induced by a sharp Berkovich indenter. The load-displacement curves, pile-up patterns and lattice rotation angles from simulation are consistent with the experimental results. The pile-up phenomenon and lattice rotation have ...
We report the mechanism of color production in peacock feathers. We find that the cortex in differently colored barbules, which contains a 2D photonic-crystal structure, is responsible for coloration. Simulations reveal that the photonic-crystal structure possesses a partial photonic bandgap along the direction normal to the cortex surface, for frequencies within which light is strongly reflect...
The crystal structures of two solvates of fac-tri-chlorido-tris-(tri-methyl-phosphane-κP)rhodium(III) are reported, i.e. one with water in the crystal lattice, fac-[RhCl3(Me3P)3]·H2O, and one with methanol in the crystal lattice, fac-[RhCl3(Me3P)3]·0.5CH3OH. These rhodium compounds exhibit distorted octahedral coordination spheres at the metal and are isotypic with the analogous iridium compoun...
We report laser micro-fabrication of photonic crystal structures in silica glass and photopolymerizing resins, and present a detailed analysis of their structural and optical properties. Photonic crystals with 2D triangular lattice and 3D diamond lattice in glass are found to exhibit moderately pronounced photonic pseudogaps. Formation of planar microcavity is demonstrated in log-pile 3D photon...
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