A Spectroscopic Study of Field and Runaway OB Stars

Identifying binaries among runaway O- and B-type stars offers valuable insight into the evolution of open clusters and close binary stars. Here we present a spectroscopic investigation of 12 known or suspected binaries among field and runaway OB stars. We find new orbital solutions for five single-lined spectroscopic binaries (HD 1976, HD 14633, HD 15137, HD 37737, and HD 52533), and we classify two stars thought to be binaries (HD 30614 and HD 188001) as single stars. In addition, we reinvestigate their runaway status using our new radial velocity data with the UCAC2 proper motion catalogs. Seven stars in our study appear to have been ejected from their birthplaces, and at least three of these runaways are spectroscopic binaries and are of great interest for future study.Comment: 21 pages, 1 figure, 7 tables; Accepted to Ap

Stability of the inverse resonance problem on the line

In the absence of a half-bound state, a compactly supported potential of a Schr\"odinger operator on the line is determined up to a translation by the zeros and poles of the meropmorphically continued left (or right) reflection coefficient. The poles are the eigenvalues and resonances, while the zeros also are physically relevant. We prove that all compactly supported potentials (without half-bound states) that have reflection coefficients whose zeros and poles are \eps-close in some disk centered at the origin are also close (in a suitable sense). In addition, we prove stability of small perturbations of the zero potential (which has a half-bound state) from only the eigenvalues and resonances of the perturbation.Comment: 21 page

MODELING OF PATTERN FORMING PROCESS OF AUTOMATIC RADIO DIRECTION FINDER OF PHASE VHF IN THE DEVELOPMENT ENVIRONMENT OF LabVIEW APPLIED PROGRAMS

In the article is developed the model demonstrating the forming process of pattern of antenna system of aerodrome quasidopler automatic radiodirection-finder station in the development environment of LabVIEW applied programs of National Instrument company

Лапароскопическая радикальная нефрэктомия с тромбэктомией из нижней полой вены I - III уровня: опыт одного центра и обзор литературы.

Objective. Radical nephrectomy with thrombectomy of the inferior vena cava is the preferred treatment for renal cell carcinoma with an tumor thrombosis. We describe our experience and presentreview of the literature evaluating the feasibility and safety of laparoscopic nephrectomy with inferior vena cava thrombectomy.Materials and methods. The study included 37 patients who underwent laparoscopic radical nephrectomy with level I–III thrombectomy for renal cell carcinoma in our institution from 2018 to 2021. We analyzed the clinical, radiographic, intraoperative, pathological and postoperative parameters of the patients. The literature was reviewed by the Medline search engine, PubMed, with a review of publications on laparoscopic radical nephrectomy with inferior vena cava levelI–IIIthrombectomy.Results. The mean operation time was 275 ± 60.1 min, the median blood loss was 450 ± 81.6 ml (≥50 % of the circulating blood volume – 32.4 %). Intraoperative complications were observed during 10 (27.0 %) operations. Postoperative complications developed in 29.7 % of patients and reached gradesIII–IV according to the Clavien–Dindo scale on 13.0 % ill. All patients are activated according to the fast track rehabilitation program. The average hospital stay was 5 days. A literature review identified clinical cases and small series demonstrating the technical feasibility and safety of laparoscopic radical nephrectomy with thrombectomy in selected patients.Conclusion. Laparoscopic radical nephrectomy with thrombectomy is a technically feasible approach in carefully selected patients with level I–III tumor thrombosis. Optimal patient selection, extensive experience in laparoscopy and specialized centers are essential for the safe use of thistechnique.Цель исследования – представить непосредственные результаты выполнения лапароскопической радикальной нефрэктомии с тромбэктомией из нижней полой вены I–III уровней в условиях одного онкоурологического стационара.Материалы и методы. В исследование были включены 37 пациентов, перенесших лапароскопическую радикальную нефрэктомию с тромбэктомией из нижней полой вены I–III уровней по поводу почечно-клеточного рака в НМИЦ онкологии им. Н.Н. Петрова в период с 2018 по 2021 г. Проанализированы клинические, рентгенографические, интраоперационные, патоморфологические и послеоперационные параметры пациентов. В системах Medline и PubMed выполнен поиск публикаций, посвященных лапароскопической радикальной нефрэктомии с тромбэктомией из нижней полой вены I–III уровней за последние 10 лет.Результаты. Среднее время операции составило 275 ± 60,1 мин, медиана объема кровопотери – 450 ± 81,6 мл (≥50 % объема циркулирующей крови – 32,4 %). Интраоперационные осложнения отмечены в 10 (27,0 %) случаях. Послеоперационные осложнения развились у 29,7 % пациентов и достигли III–IV степеней тяжести по шкале Clavien–Dindo у 13,0 % больных. Все пациенты активизированы по программе ускоренной реабилитации fast track. Средняя продолжительность пребывания в стационаре составила 5 сут. Обзор литературы выявил клинические случаи и небольшие серии, демонстрирующие техническую осуществимость и безопасность лапароскопической радикальной нефрэктомии с тромбэктомией у отдельных пациентов.Заключение. Лапароскопическая радикальная нефрэктомия с тромбэктомией – технически осуществимый подход у тщательно отобранных пациентов с опухолевым тромбом I–III уровней. Оптимальный отбор пациентов, обширный опыт лапароскопии и специализированные центры являются принципиальными элементами для безопасного применения этого метода

Laboratory practical work according to the mathematical analysis with application information technologies

In this article the structure and contents of the manual “Laboratory Workshop on the Mathematical Analysis with Application of Information Technologies” which Authors are R.M. Aslanov and O.V. Li is considered. The grant can be used when carrying out a practical training in internal, as well as in remote forms of education

Remote support of the laboratory practical work on the differential equations in pedagogical higher school institution

In article possibilities of application of remote forms of education at the rate «The differential equations» with use of a computer mathematical Maple package are considered

SOFTWARE METHODS FOR INCREASING THE RELIABILITY OF AERODROME QUASI-DOPPLER AUTOMATIC RADIO DIRECTION FINDERS

Objectives To develop software methods that can improve the reliability of airfield quasi-Doppler automatic direction finders (ADFs).Method. Mathematical models and algorithms of software fault recovery of aerodrome quasi-Doppler automatic radio direction finders were developed. It is proposed to change the structure of aerodrome quasi-Doppler automatic radio direction finders.Results. Methods and algorithms for software improvement of the reliability of airfield quasi-Doppler automatic direction finders are proposed. A novel structural organisation of airfield quasi-Doppler automatic radio direction finders is given. New software methods are proposed for ensuring ADF operability in the event of a failure of the antenna system vibrators, both with the use of phase relations from any two pairs of orthogonally arranged ring antenna vibrators and with the use of the combinatorial method. The proposed organisational ADF scheme allows the average operating time per failure of one direction-finding channel to be increased by 4.4 times.Conclusion. The developed methods for ensuring ADF operability in the event of a failure of antenna system vibrators enable a simultaneous calculation of the azimuth and angle of position on the radio emission source. The use of the proposed method increases the potential reliability of airfield quasi-Doppler automatic direction finders without any hardware costs, as well as ensuring the adequacy of the calculated instrumental error values of airfield quasi-Doppler automatic direction finders relative to the real ones

Use of new technologies in surgery

The paper is devoted to surgical care of the patients with ventral hernia by different non-intention hernia plastic techniques. A medical treatment of 103 patients divided by two groups are described. A new medical polymeric latex glue has been used for one experimental group. A comparative analysis of different treatment results is presented and related conclusions are made