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تعداد نتایج: 198388 فیلتر نتایج به سال:
We extend our recently developed Beam-Deflection (BD) method which we used to determine the sign, magnitude, and ultrafast dynamics of bound electronic and nuclear nonlinear optical responses, to measure elements of the third-order nonlinear optical susceptibility tensor with longitudinal field components. In these measurements, in contrast to the conventional BD technique where excitation and ...
Evidence is presented which indicates that, notwithstanding the change in sign made by Sommerfeld in his 1926 paper on radio wave propagation, the radiation field of a vertical electric dipole may be separated into space and surface wave components. Sommerfeld's original concepts as to the characteristics of two such waves in radio transmission are largely substantiated. It is shown that a spac...
The Poisson Nernst-Planck equations for charge concentration and electric potential in a ball is a model of electro-diffusion of ions in the head of a neuronal dendritic spine. We study the relaxation and the steady state when an initial charge of ions is injected into the ball. The steady state equation is similar to the Liouville-Gelfand-Bratú-type equation with the difference that the bounda...
An infinite, conductive cylindrical column of electrolyte lying inside another electrolyte flattens when it is submitted to a transverse continuous electric field. This ‘‘ribbon’’ effect can be canceled by a second oscillatory field whose direction is perpendicular to both the column axis and to the first electric field. The linear stability of the equilibrium with respect to elliptic perturbat...
The first comprehensive measurements of plasma flows and fluctuations nearby static magnetic islands driven by resonant magnetic perturbations (RMPs) are presented. These experiments were performed using multiple Langmuir probe arrays in the edge plasmas of the J-TEXT tokamak. The effects of controlled variations of the island size and location are explored. This study aims to understand the in...
We analyze the existence, stability, and propagation of dissipative discrete localized modes in one- and two-dimensional nonlinear lattices composed of weakly coupled split-ring resonators (SRRs) excited by an external electromagnetic field. We employ the near-field interaction approach for describing quasi-static electric and magnetic interaction between the resonators, and demonstrate the cru...
We have studied the mechanism of the spontaneous twist of surface orientation observed when cooling down 4-n heptyloxybenzoic and 4-n octyloxybenzoic acids (HOBA and OOBA) in their dimerized nematic phase, above a SiO evaporated dielectric surface. We apply an electric field parallel to the dielectric substrate. When the field is parallel to the high temperature surface projection of the direct...
Electrically Controlled Bragg Resonances of an Ambichiral Electro–optic Structure: Oblique Incidence
The Pockels effect can increase the effective birefringence of ambichiral, electro–optic rejection filters made of materials with a 4̄2m point group symmetry, when a dc electric field is applied parallel to the axis of nonhomogeneity. The reflectances and the transmittances of such an ambichiral structure for obliquely incident plane waves is solvable through a boundary–value problem that is for...
The dynamics of magnetic reconnection (MR) in the high-energy-density (HED) regime, where the plasma inflow is strongly driven and the thermal pressure is larger than the magnetic pressure (β>1), is reexamined theoretically and by particle-in-cell simulations. Interactions of two colliding laser-produced plasma bubbles with self-generated poloidal magnetic fields of, respectively, antiparallel ...
Transition metal dichalcogenides (TMDs) have emerged as promising materials to complement graphene for advanced optoelectronics. However, irreversible degradation of chemical vapor deposition-grown monolayer TMDs via oxidation under ambient conditions limits applications of TMD-based devices. Here, the growth of oxidation-resistant tungsten disulfide (WS2 ) monolayers on graphene is demonstrate...
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