We characterize three nonstandard electrohydrodynamic instabilities in nematic liquid crystals composed of bent-core molecules. In addition to their shape, another important attribute of this material is that the anisotropy in the electrical conductivity changes sign as the frequency of the applied electric field changes. These instabilities do not appear to fit within the standard model for el...

The sign of the refractive index of any medium is soley determined by the requirement that the propagation of an electromagnetic wave obeys Einstein causality. Our analysis shows that this requirement predicts that the real part of the refractive index may be negative in an isotropic medium even if the electric permittivity and the magnetic permeability are both positive. Such a system may be a...

Two computational models to be used as tools for experimental research on the retinal implant are presented. In the first model, the electric field produced by a multi-electrode array in a uniform retina is calculated. In the second model, the depolarization of the cell membrane of a probe cylinder is calculated. It is shown how these models can be used to answer questions as to cross talk of a...

We report on first principles calculations of the anisotropy of the intrinsic spin Hall conductivity (SHC) in nonmagnetic hcp metals and in antiferromagnetic Cr. For most of the metals of this study we find large anisotropies. We derive the general relation between the SHC vector and the direction of spin polarization and discuss its consequences for hcp metals. Especially, it is predicted that...

In the year 1965, Gordon E. Moore, Co-founding father of Intel, made a remark that number transistors in an integrated circuit doubled about each 2 years which as result will increase computation power exponentially and size also maintains decreasing. As get efficient, computer systems emerge smaller faster. The faster microchip approaches electric indicators, performance pc with growth micropr...

Natural selection is an important factor influencing variation in the human genome, but most genetic studies of natural selection have focused on variants with unknown phenotypic associations. This trend is changing. New studies are rapidly revealing the effects of natural selection on genetic variants of known or likely functional importance.

The need for greener and cleaner aviation has accelerated the transition towards more electric systems on More Electric Aircraft. One of key challenges related to increasing number electrical devices onboard is control bidirectional power converters. In this work, stability analysis a buck–boost converter aeronautic applications are presented. Firstly, in Lyapunov sense proven by resorting inpu...

The temperature dependences (100-380 K) of the dielectric constant and conductivity a ceramic multiferroic LuFe 2 O 4 with oxygen nonstoichiometry, measured at alternating current (1, 10, 100 kHz, 1 MHz) in static electric field (0-7.1 V/mm), are presented. regularity sign inversion dynamic permittivity caused by appearance solid-state inductance samples is discussed. Keywords: negative permitt...

using hartree-fock su-sheriffer-heeger (hf-ssh) model, we have studied the dependence of the energies of the ground (magnetic triplet state) and the first exited (nonmagnetic singlet state) states of the size-2 trigonal zigzag graphene nanoflake (size-2 nf) on the intensity of an external in plane static electric field at zero temperature. we identify a transition from the magnetic triplet stat...