نتایج جستجو برای: b4c bn
تعداد نتایج: 8878 فیلتر نتایج به سال:
B4C, Si, Al, and γ-Al2O3 were used as raw materials, formed β-Sialon SiC in situ by solid-state reaction for preparation of B4C composite powder. grains are uniformly dispersedly distributed the The effects molar ratio nitridation temperature soaking time phase composition, microstructure powder studied. When Si is 2: 3, with columnar growing alternately can be prepared after at 1500°C 4 h. liq...
Silicene is a promising 2D Dirac material as building block for van der Waals heterostructures (vdWHs). Here we investigate the electronic properties of hexagonal boron nitride/silicene (BN/Si) vdWHs using first-principles calculations. We calculate energy band structures BN/Si/BN with different rotation angles and find that silicene are retained protected robustly by BN layers. In BN/Si/BN/Si/...
A phase field framework of elasticity, inelasticity, and fracture mechanics is invoked to study the behavior ceramic materials. Mechanisms addressed by theory include deformation twinning, dislocation slip, amorphization, anisotropic cleavage fracture. Failure along grain boundaries resolved explicitly, whereWeibull statistics are used characterize surface energies such boundaries. Residual str...
Previous work from our group revealed two groups of women with bulimia nervosa (BN), one with, and one without alcohol dependence (AD). The current study sought to determine whether women with lifetime BN and AD (BN+AD+) were more similar to women with BN and no AD (BN+AD-) or to women with AD and no BN (BN-AD+) in terms of lifetime psychiatric comorbidity and psychological functioning. Data on...
the structures and stability of 531 novel boron nitride substituted isomers of 12-crown-4 etherverified theoretically. for a collection of 23 selected bn isomers, structural geometry, vibrationalstability, energy gaps, natural bond population analysis, and nonlinear optical responses investigatedtheoretically. the changes of standard enthalpies for ionization reactions and electron affinityreac...
Cancer detection in early stage using a powerful and noninvasive tool is of high global interest. In this experiment, a small-molecular-weight glucose based derivative of Gd3+-1-(4-isothiocyanatobenzyl) diethylene tri amine penta acetic acid (Gd3+-p-SCN-Bn‐DTPA‐DG) as a novel potential MR imaging contrast agents was synthesized. Gd3+-p-SCN-Bn‐DTPA‐DG was synthesized with reacting of Glucosamine...
stabilizations and atomic level quadrupole coupling constant (cq) properties have been investigated for graphene–like monolayers (g–monolayers) of boron nitride (bn), boron phosphide (bp), aluminum nitride (aln), and aluminum phosphide (alp) structures. to this aim, density functional theory (dft) calculations have been performed to optimize the model structures and also to evaluate the cq para...
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