Results of the study of the vestibular apparatus and the functions of the perception of space in cosmonauts (pre- and post-flight observations)

The effect of the set of space flight factors caused a change in the activity of the vestibular apparatus and the spatial perception function. More significant and longer shifts were observed during expeditions of great duration. The detected disorders (increase in reactivity of the otolithic apparatus, decrease in sensitivity of the cupula receptor, deterioration in the perception accuracy, etc.) had a definite tendency to be restored. The primary damage to the otolithic reflex (changes were found in practically all the subjects) is probably caused by the specific effect of zero gravitation, and apparently, may be one of the trigger mechanisms for discrepancy in the activity of the sensory systems, disorders in the correcting function of the cerebellum, and central vestibular formations

ETEKOS experimental ecological system

The problem of changes in the ecology resulting, for example, in increases in water temperature because of discharges from large thermal power plants is considered. An experiment creating a model of such an ecological system is described

Towards the electron EDM search. Theoretical study of PbF

We report ab initio relativistic correlation calculations of potential curves and spectroscopic constants for four lowest-lying electronic states of the lead monofluoride. We also calculated parameters of the spin-rotational Hamiltonian for the ground and the first excited states including P,T-odd and P-odd terms. In particular, we have obtained hyperfine constants of the $^{207}$Pb nucleus. For the $^2\Pi_{1/2}$ state $A_\perp=-6859.6$ MHz, $A_\|=9726.9$ MHz and for the A$^2\Sigma^+_{1/2}$ $A_\perp=1720.8$ MHz, $A_\|=3073.3$ MHz. Our values of the ground state hyperfine constants are in good agreement with the previous theoretical studies. We discuss and explain seeming disagreement in the sign of the constant $A_\perp$ with the recent experimental data. The effective electric field on the electron $E_{eff}$, which is important for the planned experiment to search for the electric dipole moment of the electron, is found to be 3.3 * 10^{10} V/cm

On Nonperturbative Calculations in Quantum Electrodynamics

A new approach to nonperturbative calculations in quantum electrodynamics is proposed. The approach is based on a regular iteration scheme for solution of Schwinger-Dyson equations for generating functional of Green functions. The approach allows one to take into account the gauge invariance conditions (Ward identities) and to perform the renormalization program. The iteration scheme can be realized in two versions. The first one ("perturbative vacuum") corresponds to chain summation in the diagram language. In this version in four-dimensional theory the non-physical singularity (Landau pole) arises which leads to the triviality of the renormalized theory. The second version ("nonperturbative vacuum") corresponds to ladder summation and permits one to make non-perturbative calculations of physical quantities in spite of the triviality problem. For chiral-symmetrical leading approximation two terms of the expansion of the first-step vertex function over photon momentum are calculated. A formula for anomalous magnetic moment is obtained. A problem of dynamical chiral symmetry breaking (DCSB) is considered, the calculations are performed for renormalized theory in Minkowsky space. In the strong coupling region DCSB-solutions arise. For the renormalized theory a DCSB-solution is also possible in the weak coupling region but with a subsidiary condition on the value of $\alpha$.Comment: 31 pages, Plain LaTex, no figures. Journal version: some discussion and refs. are adde

Sampling and counting genome rearrangement scenarios

Even for moderate size inputs, there are a tremendous number of optimal rearrangement scenarios, regardless what the model is and which specific question is to be answered. Therefore giving one optimal solution might be misleading and cannot be used for statistical inferring. Statistically well funded methods are necessary to sample uniformly from the solution space and then a small number of samples are sufficient for statistical inferring

A Unifying Model of Genome Evolution Under Parsimony

We present a data structure called a history graph that offers a practical basis for the analysis of genome evolution. It conceptually simplifies the study of parsimonious evolutionary histories by representing both substitutions and double cut and join (DCJ) rearrangements in the presence of duplications. The problem of constructing parsimonious history graphs thus subsumes related maximum parsimony problems in the fields of phylogenetic reconstruction and genome rearrangement. We show that tractable functions can be used to define upper and lower bounds on the minimum number of substitutions and DCJ rearrangements needed to explain any history graph. These bounds become tight for a special type of unambiguous history graph called an ancestral variation graph (AVG), which constrains in its combinatorial structure the number of operations required. We finally demonstrate that for a given history graph $G$, a finite set of AVGs describe all parsimonious interpretations of $G$, and this set can be explored with a few sampling moves.Comment: 52 pages, 24 figure

ИССЛЕДОВАНИЕ СОСТОЯНИЯ МЕТАЛЛА В ПРОЦЕССЕ РАДИАЛЬНО-СДВИГОВОЙ ПРОКАТКИ НА СТАНЕ СРВП-130

Radial-shear rolling is prominent in production of titanium alloys at «VSMPO-AVISMA» Open Society (V. Salda city) and has a number of advantages over other plastic metal working processes. In the present investigation on the basis of engineering design procedures, a complex of software has been developed for forming simulation and heat transfer in the metal volume,and with its help the rolling of VT-6 alloy bar of 155 mm in diameter has been studied. «ThermoRSR» program has been developed that allows us to visualize design data in «Mathcad» medium; rolling process simulation has been carried out by means of DEFORM-3D package; and the conditions of its application are shown. Prospective ways of rolled stock temperature and rolling torque measurement are considered.Радиально-сдвиговая прокатка (РСП) играет большую роль в производстве титановых сплавов в ОАО «ВСМПО-АВИСМА» (г. В. Салда), имея ряд преимуществ перед другими процессами обработки металлов давлением. В настоящем исследовании на базе инженерных методик расчета разработан комплекс программных средств для моделирования формоизменения и теплопередачи в объеме металла и с его помощью изучена прокатка прутка диаметром 155 мм из сплава ВТ-6. Разработана программа «ThermoRSR», позволяющая визуализировать расчетные данные в среде «Mathcad», проведено моделирование процесса прокатки с помощью пакета DEFORM-3D и показаны условия его применимости. Рассмотрены перспективные способы измерения температуры проката и крутящего момента на шпинделе прокатного стана

Robot-assisted pelvic evisceration for locally advanced cervical cancer. First experience

Pelvic evacuation in recent years has ceased to be used as a palliative method and has proved to be an effective method of surgical treatment of locally advanced pelvic tumors. Performing these operations with minimally invasive methods helps to reduce the number of postoperative complications and improve the quality of life. Purpose of the study. demonstrate the feasibility of performing robot-assisted pelvic evisceration and compare perioperative parameters with the experience of open pelvic eviscerations. Materials and methods. A 44-year-old woman with progressive local advanced cervical cancer, with a complication of the tumor process, presented by bilateral hydronephrosis. The patient was provided with an anterior robot-assisted PE with the formation ileoconduit by the Brikker method. Results. The total operation time was 515 min, the time in the console was 430 min. The estimated loss of blood was 600 ml, and the stay in the intensive care unit (ICU) - 1 day, the patient was discharged on the 7th day after the operationВведение. Эвисцерация малого таза в последние годы перестала использоваться в качестве паллиативного метода и зарекомендовала себя как эффективный метод хирургического лечения местно-распространенных опухолей малого таза. Выполнение этих операций с помощью минимально инвазивных методов помогает снизить количество послеоперационных осложнений и улучшить качество жизни. Цель исследования. Продемонстрировать целесообразность выполнения роботассистированной эвисцерации малого таза и сравнить периоперационные показатели с опытом открытых эвисцераций малого таза. Материалы и методы. Пациентке, 44-летней женщине с прогрессирующим местно-распространенным раком шейки матки, с осложнением опухолевого процесса, представленным двусторонним гидронефрозом, выполнена передняя робот-ассистированная ЭМт с формированием илеокондуита методом Бриккера. результаты. общее время работы составляло 515 мин, консольное время составляло 430 мин. оцененная потеря крови составляла 600 мл, а пребывание в отделении реанимации и интенсивной терапии – 1 сутки, пациентка выписана на 7 сутки после операци

Вентилятор-ассоциированная пневмония: диагностика, профилактика, лечение (cовременное состояние вопроса)

By analyzing the data available in the Russian and foreign literature and their many years’ experience, the authors review the state-of-the-art of the problem associated with ventilator-associated pneumonia in intensive care units. The etiology, epidemiology, and pathogenesis of ventilator-associated pneumonia, the possibilities and limitations of its prevention and diagnostic methods, successes and difficulties and treatment of this pathology are described in detail.Представлен обзор современного состояния проблемы вентилятор-ассоциированной пневмонии в отделениях реанимации на основании анализа данных современной отечественной и зарубежной литературы, собственного многолетнего опыта работы. Подробно изложены вопросы этиологии, эпидемиологии, патогенеза вентилятор-ассоциированной пневмонии, возможности и ограничения способов ее профилактики и методов диагностики, успехи и трудности лечения этой патологии