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

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

Activities of the Medical Commission during the Prophylactic Medical Examination of Athletes

Background. Preserving the health of the population, including those involved in sports, is one of the priority directions of the state policy of the Russian Federation. In accordance with the existing legislative and regulatory framework, a system for monitoring the quality and safety of medical care is being implemented in health care institutions, which also applies to medical and physical training services. One of the levels of functioning of such a system is the activity of the medical commission. Intensive training and competitive loads make increased demands on the body and are considered a risk factor for the health of athletes, which serves as the basis for their in-depth medical examination and dispensary observation. Therefore, the primary task of the medical commission during the prophylactic medical examination of athletes is to issue an expert opinion in difficult cases regarding the training and competitive activity of persons with deviations in the state of health.The objective of the research was to study of the activities of the medical commission during the prophylactic medical examination of athletes in the conditions of a medical and physical service on the basis of a scientific analysis of the results of its work for two years.Materials and methods. We studied the medical documentation of athletes who passed the medical commission for two years (2018–2019; n = 82 and n = 81, respectively). The nature of the decisions made and the structure of their reasons were analyzed using the Pearson chi-square test with amendments.Results. The share of positive and negative decisions of the commission, as well as temporary suspension from sports by years, their statistical dependences and the strength of the connection between the results are shown. The stability of the negative conclusions of the commission, as well as the structure of their reasons, was revealed (р ˃ 0.05). At the same time, in the second year of observation, they were more often temporarily suspended from sports due to musculoskeletal system diseases and less often as a result of injuries (p < 0.05).Conclusion. The main regularities of the distribution and formation of expert decisions of the medical commission for the years under study were revealed. The necessity of its activity for the medical and physical training service during the medical examination of athletes is noted, as well as the factors that prevent this are indicated

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

Technical project of complex fast cycle heat treatment of hydrogenous coal preparation

Problems of heat-treated milled hydrogenous coal preparation site creation in leading fast cycle heat treatment complex were considered. Conditions for effective use of electrostatic methods of heat-treated milled hydrogenous coal preparation were set. Technical project of heat treatment of milled hydrogenous coal preparation site was developed including coupling of working equipment complex on fast heat treatment and experimental samples of equipment being designed for manufacturing. It was stated that methods of electrical separation are used for heat-treated milled hydrogenous coal preparation with effective ways of organic and mineral components separation. Laboratory test for determination of optimal separation size sent into separators of heat-treated milled hydrogenous coal were made

Квазибиологическая модель радиогенной заболеваемости раком

The methods: Linear differential equations were used to formalize contemporary assumptions of self –sustaining tissue cell kinetics under the impact of adverse factors, on the formation and repairing of cell “pre-cancer” defects, on inheritance and retaining such defects in daughter cells which results in malignant neoplasms, on age-dependent impairment of human body’s function to eliminate such cells.The results: The model reproduces the well-known regularities of radiogenic cancer morbidity increase depending on instantaneous radiation exposure age and on attained age: the relative reduction at increased radiation age which the model attributes to age decrease of stem cells, relative reduction at increased time after radiation induced by “sorting out” of cells with “pre-cancer” defects, absolute increase with age proportional to natural cause mortality rate.The relevance of the developed quasi-biological model is displayed via comparison to the ICRP model for radiogenic increase of solid carcinomas’ morbidity after single radiation exposure. The latter model had been developed after Japanese cohort observations. For both genders high goodness-of-fit was achieved between the models at values of Gompertz’ law factor which had been defined for men and women in this cohort via selecting the value of the only free parameter indicating age-dependent exponential retardation of stem cells’ division.The conclusion: The proposed model suggests that the estimation of radiogenic risk inter-population transfer can be done on the basis of the data on age-dependent mortality intensity increase from all natural causes. The model also creates the premises for inter-species transfer of risk following the well-known parameters of cell populations’ kinetics in animal’s organs and tissues and Gompertz’s law parameters. This model is applicable also for analyses of age-dependent changes of background cancer morbidity. Цель работы: исходя из радиобиологических и демографических закономерностей, разработать математическую модель возрастной зависимости радиогенной заболеваемости раком и интенсивности смертности от рака, пригодную для межпопуляционного переноса оценок радиогенного риска.Методы: использованы линейные дифференциальные уравнения для формализации современных представлений о клеточной кинетике самоподдерживающихся тканей в условиях воздействия вредных факторов; об образовании и репарации «предраковых» дефектов в клетках; о наследовании и сохранении таких дефектов в дочерних клетках, приводящих к злокачественным новообразованиям; о снижении, по мере старения организма, его способности устранять подобные клетки.Результаты: Модель воспроизводит известные закономерности зависимости радиогенного увеличения заболеваемости раком от возраста мгновенного облучения и от достигнутого возраста: относительный спад с увеличением возраста облучения, который в модели связан с возрастным спадом количества стволовых клеток; относительный спад с увеличением времени, прошедшего после облучения, обусловленный выбраковкой клеток с «предраковыми» дефектами; абсолютное увеличение с возрастом, пропорциональное интенсивности смертности по естественным причинам. Адекватность разработанной квазибиологической модели продемонстрирована на примере сравнения с моделью МКРЗ для радиогенного увеличения заболеваемости солидными раками после однократного облучения, разработанной по результатам наблюдений за японской когортой. При значениях показателя закона Гомперца, определенных ранее для мужчин и женщин этой когорты, путём выбора значения единственного свободного параметра – показателя экспоненциального замедления скорости деления стволовых клеток с возрастом – для обоих полов достигнуто очень хорошее согласие моделей.Заключение: из предложенной модели следует, что межпопуляционный перенос оценок радиогенного риска можно осуществлять на основе данных о возрастном увеличении интенсивности смертности от всех естественных причин. Модель создаётпредпосылки и для межвидового переноса рисков по известным параметрам кинетики клеточных популяций в органах и тканях животных и параметрам закона Гомперца. Модель может использоваться также для анализа закономерностей возрастных изменений фоновой заболеваемости раком.