Hybrid heterostructures with superconducting/antiferromagnetic interfaces

We report on structural, DC, X-ray and neutron studies of hybrid superconducting mesa-heterostructures with a cuprate antiferromagnetic interlayer Ca1-xSrxCuO2 (CSCO). The upper electrode was bilayer Nb/Au superconductor and copper oxide superconductor YBa2Cu3O7 (YBCO) was the bottom electrode. It was experimentally shown that during the epitaxial growth of the two films YBCO and CSCO a charge carrier doping takes place in the CSCO interlayer with a depth about 20 nm. The conductivity of the doped part of CSCO layer is close to the metal type, while the reference CSCO film, deposited directly on NdGaO3 substrate, behaves as Mott insulator with the hopping conductivity. The interface Au/CSCO is clearly seen on bright-field image of the cross-section of heterostructure and gives the main contribution to the total resistance of mesa-heterostructure.Comment: 16 pages, 9 figure

Использование 3D модели для подсчета объемов вскрышных пород и полезного ископаемого

The volumes of overburden rocks and minerals were calculated based on the 3D model of the deposit, which was created using results of analysis of the geological structure of the deposit, and construction of the topographic surface. A comparative table of the results of calculating the volumes of overburden rocks and minerals was compiled using the method of geological blocks and 3D models.Проанализировано геологическое строение месторождения, проведена обработка исходных данных, построена топографическая поверхность, построена 3D модель месторождения, подсчитаны объемы вскрышных пород и полезного ископаемого, составлена сравнительная таблица результатов подсчета объемов вскрышных пород и полезного ископаемого по методу геологических блоков и 3D модели

About Tactics of Treatment of Patients with Diverticulosis of the Colon and Liver Comorbidity

Purpose: To prove rational methods of treatment of patients with diverticulosis of the colon and liver comorbidity by studying of some pathogenetic mechanisms of formation of disease and features of its current.Material and Methods: 97 patients with diverticular disease of colon from which at 35 involving in pathological process of a liver by an original technique (the Federal patent of Russia № 2119168 has been diagnosed) are surveyed. Patients have been divided on two groups: the first group (10 patients) received traditional treatment, in the second group (25 patients) treatment spent by the developed technique.Results: At diverticular disease of colonin 87,63% of cases infringement of function of a liver at what is more often it meets at aged people from 45 till 70 years comes to light. It is established that the pathogenetic interrelation of frustration of function of a liver and a thick gut at diverticular is caused by infringement of local hemodynamics, and also activation of processes peroxidation oxidations of lipids (FLOOR).Summary: Combined application antioxidatic positive therapies and hepatoprotectors against the standard therapy, leads to current improvement diverticulosis thick intestine at 72,6% patients

Negative high-frequency differential conductivity in semiconductor superlattices

We examine the high-frequency differential conductivity response properties of semiconductor superlattices having various miniband dispersion laws. Our analysis shows that the anharmonicity of Bloch oscillations (beyond tight-binding approximation) leads to the occurrence of negative high-frequency differential conductivity at frequency multiples of the Bloch frequency. This effect can arise even in regions of positive static differential conductivity. The influence of strong electron scattering by optic phonons is analyzed. We propose an optimal superlattice miniband dispersion law to achieve high-frequency field amplification

Novel Regime of Operation for Superconducting Quantum Interference Filters

A new operating regime of the Superconducting Quantum Interference Filter (SQIF) is investigated. The voltage to magnetic field response function, V(H), is determined by a Fraunhofer dependence of the critical current and magnetic flux focusing effect in Josephson junctions (F-mode). For SQIF-arrays made of high-Tc superconducting bicrystal Josephson junctions the F-mode plays a predominant role in the voltage-field response V(H). The relatively large superconducting loops of the SQIF are used for inductive coupling to the external input circuit. It is shown that the output noise of a SQIF-array measured with a cooled amplifier in the 1-2 GHz range is determined by the slope of the V(H) characteristic. Power gain and saturation power were evaluated using low frequency SQIF parameters. Finally, we consider the influence of the spread in the parameters of Josephson junctions in the SQIF-array on the V(H) characteristic of the whole structure.Comment: 7 pages, 4 figure