The color tuning mechanism of the rhodopsin protein family has been in the focus of research for decades. However, the structural basis of the tuning mechanism in general and of the absorption shift between rhodopsins in particular remains under discussion. It is clear that a major determinant for spectral shifts between different rhodopsins are electrostatic interactions between the chromophor...

We investigate the tunneling of quasiparticles arising in multi-Weyl semimetals through a barrier consisting both electrostatic and vector potentials, existing uniformly finite region along transmission axis. The dispersion semimetal is linear one direction (say, kz), proportional to k?J plane perpendicular it (where k?=kx2+ky2). Hence, we study cases when kz kx, respectively. For comparison, a...

Interpolating scaling functions give a faithful representation of a localized charge distribution by its values on a grid. For such charge distributions, using a fast Fourier method, we obtain highly accurate electrostatic potentials for free boundary conditions at the cost of O(N log N) operations, where N is the number of grid points. Thus, with our approach, free boundary conditions are trea...

The redox properties of metallic nanoparticles are discussed, in particular the relationships between excess charge, size and the Fermi level of the electrons. The redox potentials are derived using simple electrostatic models to provide a straightforward understanding of the basic phenomena. The different techniques used to measure the variation of Fermi level are presented. Finally, redox asp...

The exterior solution for an arbitrary charged, massive source, is studied as a static deviation from the Reissner-Nordstrøm metric. This is reduced to two coupled ordinary differential equations for the gravitational and electrostatic potential functions. The homogeneous equations are explicitly solved in the particular case q2 = m2, obtaining a multipole expansion with radial hypergeometric d...

The photosynthetic reaction center (RC) from Rhodopseudomonas viridis contains four cytochrome c hemes. They establish the initial part of the electron transfer (ET) chain through the RC. Despite their chemical identity, their midpoint potentials cover an interval of 440 mV. The individual heme midpoint potentials determine the ET kinetics and are therefore tuned by specific interactions with t...

We report on experiments with cold thermal (7)Li atoms confined in combined magnetic and electric potentials. A novel type of three-dimensional trap was formed by modulating a magnetic guide using electrostatic fields. We observed atoms trapped in a string of up to six individual such traps, a controlled transport of an atomic cloud over a distance of 400 microm, and a dynamic splitting of a si...

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Analytical solutions describing quantum swap and Hadamard gate are given with the use of tight-binding approximation. Decoherence effects described analytically for 2 interacting electrons confined by local potentials simplistic model in Schroedinger formalism omission spin degree freedom. The obtained results can be generalized case [Formula: see text] electrostatically bodies ([Formula: text]...

In this paper the results of a two-dimensional diode emission system based on blade-like field cathode in polar coordinate modeling is presented. The top emitter circle with dielectric coating. anode coaxial to emitter. boundary condition first kind set cathode, and second anode. problem calculating electrostatic potential distribution reduced solving linear algebraic equations constant coeffic...