نتایج جستجو برای: electric sign
تعداد نتایج: 198388 فیلتر نتایج به سال:
We report the experimental observation of the spin-Hall effect in a two-dimensional (2D) hole system with Rashba spin-orbit coupling. The 2D hole layer is a part of a p-n junction light-emitting diode with a specially designed vertical and planar geometry which allows an angle-resolved polarization detection at opposite edges of the 2D hole system. In equilibrium the angular momenta of the Rash...
We report the experimental observation of the spin-Hall effect in a 2D hole system with spin-orbit coupling. The 2D hole layer is a part of a p-n junction light-emitting diode with a specially designed coplanar geometry which allows an angle-resolved polarization detection at opposite edges of the 2D hole system. In equilibrium the angular momenta of the spin-orbit split heavy-hole states lie i...
Magnetic interlayer coupling is one of the central phenomena in spintronics. It has been predicted that the sign of interlayer coupling can be manipulated by electric fields, instead of electric currents, thereby offering a promising low energy magnetization switching mechanism. Here we present the experimental demonstration of voltage-controlled interlayer coupling in a new perpendicular magne...
We study an electric quadrupole contribution to sum frequency generation (SFG) at air∕liquid interfaces in an electronically and vibrationally nonresonant condition. Heterodyne-detected electronic sum frequency generation spectroscopy of air∕liquid interfaces reveals that nonresonant χ((2)) (second-order nonlinear susceptibility) has a negative sign and nearly the same value for all eight liqui...
In this paper, we consider a massive charged scalar field coupled to a uniform electric field background in a 3 dimensional de Sitter spacetime. We consider the value of the dimensionless coupling constant of the scalar field to the scalar curvature of a 3 dimensional de Sitter spacetime equal to 1/8. We compute the expectation value of the trace of the energy-momentum tensor in the in-vacuum s...
In this paper we investigate the coarsening dynamics of liquid crystal textures in a two-dimensional nematic under applied electric fields, using numerical simulations performed using a publicly available liquid crystal algorithm developed by the authors. We consider both positive and negative dielectric anisotropies and two different possibilities for the orientation of the electric field (par...
We formulate a premetric version of classical electrodynamics in terms of the excitation H = (H,D) and the field strength F = (E,B). A local, linear, and symmetric spacetime relation between H and F is assumed. It yields, if electric/magnetic reciprocity is postulated, a Lorentzian metric of spacetime thereby excluding Euclidean signature (which is, nevertheless, discussed in some detail). More...
We formulate a premetric version of classical electrodynamics in terms of the excitation H = (H,D) and the field strength F = (E,B). A local, linear, and symmetric spacetime relation between H and F is assumed. It yields, if electric/magnetic reciprocity is postulated, a Lorentzian metric of spacetime thereby excluding Euclidean signature (which is, nevertheless, discussed in some detail). More...
We have fabricated exchange-biased Co/Pt layers ((0.3 nm/1.5 nm) 3) on (0 01)-oriented Cr2O3 thin films. The multilayered films showed extremely smooth surfaces and interfaces with root mean square roughness of E0.3 nm for 10mm 10mm area. The Cr2O3 films display sufficient insulation with a relative low leakage current (1.17 10 A/cm at 380MV/m) at room temperature which allowed us to apply elec...
در این پروژه سعی شده است که با بکارگیری روشهای متداول کنترل موجودی، سیستم انبار و سفارشات کارخانجات نیرو تابلو بهینه سازی شود. بدین منظور ابتدا به بررسی و معرفی این شرکت، محصولات و فرآیند تولید در این واحد صنعتی پرداخته شده است. پس از آن دلایل نیاز به سیستم کنترل موجودی مطرح گردیده است. پس از تهیه لیست مواد اصلی مورد نیاز تابلوها با استفاده از طبقه بندی a، b،c کلیه مواد اصلی طبقه بندی شده و سپس...
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