Technique of electrical stimulation of the vestibular analyzer under clinical conditions

Vestibular reactions appear under the action of direct current (dc) on the labyrinth of man and animals. A decrease of the stimulation effect of dc on the extralabyrinthine nervous formations in the suggested method is achieved by the use of electric pulses with steep front and back parts, as well as by previous anesthetization of the skin in the electrode application area by means of novocain solution electrophoresis. For this purpose a pulse producer giving trapezoid pulses with smoothly changing fronts and duration was constructed. With the help of an interrupter it is possible to stop the current increase instantly, and stimulation is performed at the level of the pulse 'plateau'. To induce vestibular reactions under monopolar stimulation, it is necessary to apply the current twice as high as that with bipolar electrode position. The use of short pulses with steep front and back parts for electrode stimulation of the vestibular analyzer is considered to be inexpedient

Phenomenological description of the microwave surface impedance and complex conductivity of high-TcT_c single crystals

Measurements of the microwave surface impedance $Z_s(T)=R_s(T)+iX_s(T)$ and of the complex conductivity $\sigma_s(T)$ of high-quality, high-$T_c$ single crystals of YBCO, BSCCO, TBCCO, and TBCO are analyzed. Experimental data of $Z_s(T)$ and $\sigma_s(T)$ are compared with calculations based on a modified two-fluid model which includes temperature-dependent quasiparticle scattering and a unique temperature variation of the density of superconducting carriers. We elucidate agreement as well as disagreement of our analysis with the salient features of the experimental data. Existing microscopic models are reviewed which are based on unconventional symmetry types of the order parameter and on novel mechanisms of quasiparticle relaxation.Comment: 15 pages, 17 figures, 1 tabl

New measurements and analysis of elastic scattering of

The angular distributions of $$^{13}$$C elastically scattered by $$^{9}$$Be nuclei were measured at $$E_{Lab}$$ ($$^{13}$$C) = 16.25 and 19.5 MeV. The measured angular distributions were analyzed via the optical model and the DWBA within the coupled reaction channels methods. In addition to this, the previously obtained data were reanalyzed at energies $$E_{Lab}$$ = 22.75, 28.12, 36.15, 57.77 and 72.88 MeV. The aim of the study was to elucidate the role of the $$\alpha$$-cluster transfer mechanism in the large-angle scattering. As a result of these calculations, the optimal parameters of the potentials and their energy dependence were obtained for $$^{13}$$C+$$^{9}$$Be nuclear system. The data at the backward angles are fairly well reproduced. The spectroscopic amplitudes were extracted for the $$^{13}$$C $$\rightarrow$$$$^{9}$$Be + $$\alpha$$ configuration at various energies. The results are compared with previously reported values

Asymptotic normalization coefficient for

This work is aimed at clarifying the contribution of the proton direct radiative capture to the $${}^{12}\mathrm{C}(p,\gamma ){}^{13}\mathrm{N}$$ reaction by specifying the value of the asymptotic normalization coefficient (ANC) for $${}^{12}\mathrm{C}+p\rightarrow {}^{13}\mathrm{N}_\mathrm{g.s.}$$. In order to do this, the differential cross section of the proton transfer in the $${}^{12}\mathrm{C}({}^{10}\mathrm{B},{}^9\mathrm{Be})^{13}\mathrm{N}$$ reaction at an energy of 41.3 MeV has been measured and analyzed through the modified distorted wave Born approximation (MDWBA) method taking into account the reaction channel coupling and $${}^{3}{\mathrm{He}}$$ cluster transfer contributions. The value of the ANC was derived to be 1.63±0.13 fm$$^{-1/2}$$, which was used in estimating the astrophysical S(E) factor and the reaction rate of the proton radiative capture by the $${}^{12}{\mathrm{C}}$$ nucleus at energies of astrophysical relevance