QED cascades induced by circularly polarized laser fields

The results of Monte-Carlo simulations of electron-positron-photon cascades initiated by slow electrons in circularly polarized fields of ultra-high strength are presented and discussed. Our results confirm previous qualitative estimations [A.M. Fedotov, et al., PRL 105, 080402 (2010)] of the formation of cascades. This sort of cascades has revealed the new property of the restoration of energy and dynamical quantum parameter due to the acceleration of electrons and positrons by the field and may become a dominating feature of laser-matter interactions at ultra-high intensities. Our approach incorporates radiation friction acting on individual electrons and positrons.Comment: 13 pages, 10 figure

Clinical case of using NPWT-system with retroperitoneal lymphocela in generalized peritonitis

The article presents a clinical case of treatment of retroperitoneal lymphocele in generalized fibrinopurulent peritonitis. Thanks to the use of the NPWTsystem, it was possible to achieve the elimination of lymphocele, peritonitis and improve the patient's condition.В статье приведен клинический случай лечения лимфоцеле забрюшинного пространства на фоне разлитого фибринозно-гнойного перитонита. Благодаря применению NPWT-системы, удалось достигнуть ликвидации лимфоцеле, перитонита и улучшения состояния пациентки

The prevalence of arterial hypertension in school-age children of Yekaterinburg

This article presents the prevalence of arterial hypertension between school-age children and the frequency of current pathological state in 31,1% cases. The parameters of physical development were evaluated and the developmental abnormality was demonstrated in 41.5% of school-age children. It was noticed that the leader abnormality of the physical development is increasing of the body mass index.В работе определена распространенность артериальной гипертензии среди школьников, показана встречаемость данной патологии в 31,1% случаев. Проведена оценка параметров физического развития, продемонстрировано отклонение в развитии у 41,5% детей школьного возраста. Отмечено, что ведущим отклонением в физическом развитии современных школьников является увеличение индекса массы тела

Identification of signs of alcohol abuse in employees of a small company design and production profile (pilot study)

The article presents the results of a study to identify signs of alcohol abuse among workers of a small company with a design and production profile in the city of Yekaterinburg and risk factors for the formation of alcohol dependence. According to the results of the questioning of 25 employees, 28% of the respondents showed signs of alcohol dependence syndrome. The main factors that increase psychological stress, contributing to alcohol abuse: long business trips, lack of vacations during the year, conflict relationships in the team and dissatisfaction with the work performedВ статье представлены результаты исследования по выявлению признаков злоупотребления алкоголем у работников малой компании проектно-производственного профиля города Екатеринбурга и факторов риска формирования алкогольной зависимости. По результатам анкетирования 25 сотрудников, у 28% опрошенных выявлены признаки синдрома зависимости от алкоголя. Определены основные факторы, повышающие психологическое напряжение, способствующее злоупотреблению алкоголем: длительные командировки, отсутствие отпусков в течение года, конфликтные отношения в коллективе и неудовлетворенность выполняемой работо

The model of a project management of the medical organization's reputation

The article describes a model of a reputation strategy with specific measures for formation, consolidation and maintenance of a medical organization’s stable positive reputationВ статье рассмотрена модель репутационной стратегии с конкретными мероприятиями, направленными на формирование, закрепление и поддержание стабильной положительной репутации медицинской организации

Efficient ion acceleration and dense electron-positron plasma creation in ultra-high intensity laser-solid interactions

The radiation pressure of next generation ultra-high intensity ($>10^{23}$ W/cm$^{2}$) lasers could efficiently accelerate ions to GeV energies. However, nonlinear quantum-electrodynamic effects play an important role in the interaction of these laser pulses with matter. Here we show that these effects may lead to the production of an extremely dense ($\sim10^{24}$ cm$^{-3}$) pair-plasma which absorbs the laser pulse consequently reducing the accelerated ion energy and energy conversion efficiency by up to 30-50\%

On the macroscopic formation length for GeV photons

Experimental results for the radiative energy loss of 206 and 234 GeV electrons in 5–10 μm thin Ta targets are presented. An increase in radiation emission probability at low photon energies compared to a 100 μm thick target is observed. This increase is due to the formation length of the GeV photons exceeding the thickness of the thin foils, the so-called Ternovskii–Shul'ga–Fomin (TSF) effect. The formation length of GeV photons from a multi-hundred GeV projectile is through the TSF effect shown directly to be a factor 1010 longer than their wavelength

Modelling the effects of the radiation reaction force on the interaction of thin foils with ultra-intense laser fields

The effects of the radiation reaction (RR) force on thin foils undergoing radiation pressure acceleration (RPA) are investigated. Using QED-particle-in-cell simulations, the influence of the RR force on the collective electron dynamics within the target can be examined. The magnitude of the RR force is found to be strongly dependent on the target thickness, leading to effects which can be observed on a macroscopic scale, such as changes to the distribution of the emitted radiation and the target dynamics. This suggests that such parameters may be controlled in experiments at multi-PW laser facilities. In addition, the effects of the RR force are characterized in terms of an average radiation emission angle. We present an analytical model which, for the first time, describes the effect of the RR force on the collective electron dynamics within the 'light-sail' regime of RPA. The predictions of this model can be tested in future experiments with ultra-high intensity lasers interacting with solid targets