DC-assisted microwave quenching of YBa2Cu3O7-{\delta} coplanar waveguide to a highly dissipative state

The paper reports on finding the effect of a strong change in the microwave losses in an HTS-based coplanar waveguide (CPW) at certain values of the input power Pin and direct current Idc. CPW on the basis of 150 nm thick YBa2Cu3O7-{\delta} epitaxial film on a single crystal MgO substrate was studied experimentally. A sharp and reversible transition of the CPW into a strongly dissipative state at the certain meanings of Pin and Idc depending on temperature was observed. Apparently the effect can be explained by self-heating of HTS structure caused by magnetic flux flow under the joint influence of MW and DC.Comment: 9 pages, 5 figures, 17 reference

МЕТОД ГЛОБАЛЬНОЙ ПОДГОНКИ ОБОБЩЁННЫХ МОДЕЛЕЙ РАДИОГЕННОГО РИСКА ПОД ДАННЫЕ ЯПОНСКОЙ КОГОРТЫ

Research and Technical Center of Radiation-Chemical Safety and Hygiene (RTC RCSH), Moscow, Russia Generalized radiogenic risk models presented in ICRP Publication 103 have a number of attractive features. The models themselves and the corresponding models of background risks are generalized by a single function containing only three parameters specific to the localization of cancer, sex and risk indicator (absolute or relative; mortality or morbidity). However, there are several discrepancies in the values of model parameters for the individual cancer sites and in some predictions based on these models. The aim of this study was to clarify the possibility of refining the parameters of the ICRP models using the LSS cohort data. The method of calculation of the parameters of these models has been developed and verified based on the data on baseline mortality in the cohort and among entire Japanese population. The method consists in the averaging of the local estimates of the parameters calculated based on the values of the rate of the mortality in the ends of different segments of age at exposure and attained age within the entire examined area of change of these variables. The latest published mortality data in the cohort and mortality tables for Japan from the WHO database were used to calculate the mortality rate matrices. Data on the baseline mortality from solid cancers in LSS were in good agreement with statistically more reliable data for the entire Japanese population. Hence, the latter were used for verification of the method.According to the criteria of absolute and relative standard deviation, the ICRP models at whole better approximate baseline and radiogenic mortality from solid cancers in the cohort based on the values of parameters calculated using the proposed method compared to the values from the ICRP. The sets of parameter values for men and women, calculated from LSS data and for the Japanese population differ significantly, while in ICRP models they are almost the same. Обобщённые модели радиогенных рисков из Публикации 103 МКРЗ обладают рядом привлекательных особенностей. Сами модели и соответствующие им модели фоновых рисков обобщаются единой функцией, содержащей всего три параметра, специфичные для локализации рака, пола и показателя риска (абсолютный или относительный; по смертности или заболеваемости). Однако имеется ряд несоответствий в значениях параметров моделей для отдельных локализаций рака и в некоторых прогнозах, основанных на этих моделях. Цель настоящей работы состояла в выяснении возможностей уточнения параметров моделей МКРЗ по данным когорты LSS. Предложен и на примере данных о фоновой смертности в когорте и среди всего населения Японии верифицирован метод расчёта параметров этих моделей. Суть метода заключается в усреднении локальных оценок параметров, рассчитываемых по значениям интенсивности смертности в концах различных отрезков возрастов при облучении и достигнутых возрастов в пределах всей изученной области изменения этих переменных. Необходимые для расчётов матрицы интенсивностей смертности определяли по последним опубликованным данным о смертности в когорте и таблицы смертности для Японии из базы данных ВОЗ. Данные о фоновой смертности от солидных раков в когорте удовлетворительно согласуются со статистически более надёжными данными для всего населения Японии, поэтому преимущественно на последних был верифицирован метод. Показано, что по абсолютным и относительным среднеквадратичным отклонениям модели МКРЗ при рассчитанных предложенным методом значениях параметров аппроксимируют данные о фоновой и радиогенной смертности от солидных раков в когорте в целом лучше, чем при значениях, принятых МКРЗ. Наборы значений параметров для мужчин и женщин, рассчитанные по данным когорты и для населения Японии, существенно различаются, тогда как в моделях МКРЗ они почти одинаковы. Результаты расчётов параметров и, соответственно, чисел радиогенных смертей, сильно зависят от полноты учёта данных о смертности в младших и старших группах достигнутых возрастов, а также от ширины интервалов возрастов при облучении, по которым усредняются интенсивности смертности. Результаты работы показывают, что возможности уточнения моделей радиогенного риска на основе данных когорты далеко не исчерпаны

Anomalous microwave conductivity coherence peak in c-axis MgB2 thin film

The temperature dependence of the real part of the microwave complex conductivity at 17.9 GHz obtained from surface impedance measurements of two c-axis oriented MgB2 thin films reveals a pronounced maximum at a temperature around 0.6 times the critical temperature. Calculations in the frame of a two-band model based on Bardeen-Cooper-Schrieffer (BCS) theory suggest that this maximum corresponds to an anomalous coherence peak resembling the two-gap nature of MgB2. Our model assumes there is no interband impurity scattering and a weak interband pairing interaction, as suggested by bandstructure calculations. In addition, the observation of a coherence peak indicates that the pi-band is in the dirty limit and dominates the total conductivity of our filmsComment: 10 pages, 4 figures, to be published in Phys. Rev. Let

The multifrequency Siberian Radioheliograph

The 10-antenna prototype of the multifrequency Siberian radioheliograph is described. The prototype consists of four parts: antennas with broadband front-ends, analog back-ends, digital receivers and a correlator. The prototype antennas are mounted on the outermost stations of the Siberian Solar Radio Telescope (SSRT) array. A signal from each antenna is transmitted to a workroom by an analog fiber optical link, laid in an underground tunnel. After mixing, all signals are digitized and processed by digital receivers before the data are transmitted to the correlator. The digital receivers and the correlator are accessible by the LAN. The frequency range of the prototype is from 4 to 8 GHz. Currently the frequency switching observing mode is used. The prototype data include both circular polarizations at a number of frequencies given by a list. This prototype is the first stage of the multifrequency Siberian radioheliograph development. It is assumed that the radioheliograph will consist of 96 antennas and will occupy stations of the West-East-South subarray of the SSRT. The radioheliograph will be fully constructed in autumn of 2012. We plan to reach the brightness temperature sensitivity about 100 K for the snapshot image, a spatial resolution up to 13 arcseconds at 8 GHz and polarization measurement accuracy about a few percent. First results with the 10-antenna prototype are presented of observations of solar microwave bursts. The prototype abilities to estimate source size and locations at different frequencies are discussed

DISTRIBUTION MODEL AND ACCRUED STIMULATING ALLOWANCES IN A MEDICAL ORGANIZATION WITH A HEALTH CENTER IN ITS STRUCTURE

This publication contains the universal model of the distribution of incentive bonuses in the medical organization, by the example of the structure containing a health center. Prepared algorithm of individual incentive bonuses presents the requirements for formulating criteria, and a form of the final protocol, painted traffic scheme documents is developed