Electric Current Transmission Through Tissues of the Vestibular Labyrinth of a Patient: Perfection of the Vestibular Implant

Russian Physics Journal - An electric model of current transmission through tissues of the vestibular labyrinth of a patient is suggested. To stimulate directly the vestibular nerve in surgical...     

A fiber quantum communication system based on an autocompensation optical circuit

An experimental setup for studying the distribution of a quantum key in a fiber optic communication line designed at the Institute of Semiconductor Physics, Russian Academy of Sciences, Siberian Branch is presented. The structure of a unified control unit for studying the distributed quantum key setup using the BB84 protocol with phase encoding is described. Experimental results on quantum key generation are given.     

Mean field for the p+90Zr system in the energy range −60 MeV<E<+65 MeV and single-particle features of proton states in 90Zr from a dispersive optical-model analysis

Data on the scattering of protons with energies 5 MeV<E<65 MeV by ⁹⁰Zr nuclei and data on the energies of proton particle and hole levels in the A+1 and A?1 systems with A=90 are analyzed within the dispersive optical model. The parameters of the mean proton field for ⁹⁰Zr are determined in the energy range ?60 MeV<E<+65 MeV. The predicted single-particle features of the levels (root-mean-square radii of orbits, occupation numbers, spread widths, spectroscopic factors, and spectral functions) comply well with experimental data obtained in (d, ³He), (³He, d), (n, d), and (d, n) reactions for levels near the Fermi surface and in (e, e′p) and (p, 2p) reactions for deep levels.     

Diagnostics of pulsed molecular beams and free jets with pyroelectric detectors and TEA CO2 lasers

A pyroelectric detector with a time resolution of 3–5 s and a TEA CO₂ laser have been used in diagnostics of a pulsed molecular beam (a free jet). The kinetic energy distribution of molecules was determined by using time-of-flight measurements both with a laser and without it. A combination of the laser with the pyroelectric detector makes it possible to determine the kinetic energy distribution of molecules in a selected internal state and to measure the energy absorted by the molecules of the beam from a laser pulse. The results obtained for pure SF₆ and the SF₆ seeded in He have been presented and analyzed. The advantages and the disadvantages of the method are being discussed in comparison with other available methods of diagnostics of molecular beams and free jets.     

Beryllium-Based Multilayer Mirrors for the Soft X-Ray and Extreme Ultraviolet Wavelength Ranges

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques - The latest experimental results of studying beryllium-containing multilayer mirrors are reviewed. The mirrors are of...     

Application of Composite Materials Based on Various Extractants for Isolation of Lanthanide(III) Nitrates from Multicomponent Aqueous Solutions

Extraction of lanthanide(III) nitrates of ceric subgroup was studied by pure tributylphosphate, 50% solution of trialkylmethylammonium nitrate in toluene and composite materials based on porous Teflon and mentioned extractans in the presence of 1–5 mol/dm³ of sodium nitrate in aqueous phase. Effect of additions of sodium sulfate and chloride to nitrate solutions on distribution parameters of lanthanides(III) was determined. The extraction process can be described with taking into account the formation of [Ln(NO₃)₃(S) _j ] (j = 3, 4) in organic phase. The extraction constants were estimated. It was established, that accounting tributylphosphate concentration in the phase of composite, extraction constants and isotherm shape for systems based on tributylphosphate are identical within the error of determination. In the case of trialkylmethylammonium nitrate those for composite are little greater then for liquid extractant.     

Observation of spectral line splitting for parametric X-rays

The spectral distribution and energy dependence of the yield of parametric X-rays for 200 to 900 MeV electrons transmitted through a silicon crystal have been measured. The measurements were performed in the Bragg geometry at an angle θ = 19° to the electron beam direction. The effect of spectral line splitting for parametric X-rays was observed.