Search interactive regional game as a metod of developing general competencies

The article presents the possibility of using regional interactive quest game as the pedagogical technology aimed to formation of the general competences of studentsВ статье рассматривается возможность использования краеведческой интерактивной игры-квеста, как педагогической технологии, направленной на формирование общих компетенций обучающихс

Search for sterile neutrinos at the DANSS experiment

DANSS is a highly segmented 1~m${}^3$ plastic scintillator detector. Its 2500 one meter long scintillator strips have a Gd-loaded reflective cover. The DANSS detector is placed under an industrial 3.1~$\mathrm{GW_{th}}$ reactor of the Kalinin Nuclear Power Plant 350~km NW from Moscow. The distance to the core is varied on-line from 10.7~m to 12.7~m. The reactor building provides about 50~m water-equivalent shielding against the cosmic background. DANSS detects almost 5000 $\widetilde\nu_e$ per day at the closest position with the cosmic background less than 3$\%$. The inverse beta decay process is used to detect $\widetilde\nu_e$. Sterile neutrinos are searched for assuming the $4\nu$ model (3 active and 1 sterile $\nu$). The exclusion area in the $\Delta m_{14}^2,\sin^22\theta_{14}$ plane is obtained using a ratio of positron energy spectra collected at different distances. Therefore results do not depend on the shape and normalization of the reactor $\widetilde\nu_e$ spectrum, as well as on the detector efficiency. Results are based on 966 thousand antineutrino events collected at 3 distances from the reactor core. The excluded area covers a wide range of the sterile neutrino parameters up to $\sin^22\theta_{14}<0.01$ in the most sensitive region.Comment: 10 pages, 13 figures, version accepted for publicatio

DANSSino: a pilot version of the DANSS neutrino detector

DANSSino is a reduced pilot version of a solid-state detector of reactor antineutrinos (to be created within the DANSS project and installed under the industrial 3 GW(th) reactor of the Kalinin Nuclear Power Plant -- KNPP). Numerous tests performed at a distance of 11 m from the reactor core demonstrate operability of the chosen design and reveal the main sources of the background. In spite of its small size (20x20x100 ccm), the pilot detector turned out to be quite sensitive to reactor antineutrinos, detecting about 70 IBD events per day with the signal-to-background ratio about unity.Comment: 16 pages, 11 figures, 3 tables. arXiv admin note: substantial text overlap with arXiv:1304.369

К вопросу о современном подходе к диагностике и лечению травм селезенки у детей

 Today, the problem of spleen injury in children still appears relevant. The choice of diagnostics and treatment tactics at the present stage is far from being unified. The priority direction is the organ-preserving approach, which  is possible and justified in children, which significantly reduces surgical  aggression and prevents the likelihood of negative consequences of splenectomy. The choice of the optimal diagnostic method and  determination of safe treatment tactics was the purpose of our study. Thirty-nine injured children were treated in 2007–2019. The predominant cause of spleen injury was fall from height (64.1%). Echography was the main diagnostic method, which was performed around the clock. Splenectomy  was performed in 7 patients (17.9%), in 32 children (82.1%) the organ was preserved. One case (2.6%) was fatal. The analysis of our own results showed that the widespread use of echography, particularly by surgeons, is necessary in the emergency service and greatly simplifies the work. The developed local protocol for diagnosis and treatment is simple and accessible, since it is based on the interpretation of the main criteria, such as systemic hemodynamics and hemoperitoneum. Continued bleeding reasons diagnostic laparoscopy. With unstable hemodynamics, large hemoperitoneum, laparotomy is indicated.Проблема травмы селезенки у детей не теряет своей актуальности и в настоящее время. Выбор диагностики и лечебной тактики на современном этапе далек от унификации. Приоритетным направлением является органосохраняющий подход, который возможен и обоснован у детей, что значительно снижает хирургическую агрессию и предупреждает вероятность отрицательных последствий спленэктомии. Выбор оптимального метода  диагностики и определение безопасной тактики лечения послужили целью нашего исследования. Пролечены 39 пострадавших детей за период с 2007 по 2019 г. Преобладающей причиной повреждения селезенки была кататравма (64,1%). Эхография являлась основным методом диагностики, которую выполняли в круглосуточном режиме.  Спленэктомия проведена 7 пациентам (17,9%), у 32 детей (82,1%) орган сохранен. В одном случае (2,6%) отмечен летальный исход. Анализ собственных результатов показал, что широкое использование эхографии, в том числе и хирургами, необходимо в ургентной службе и значительно упрощает работу. Разработанный локальный протокол диагностики и лечения прост и доступен, так как основывается на интерпретации главных критериев, таких  как системная гемодинамика и гемоперитонеум.  Продолжающееся кровотечение служит основанием для  проведения диагностической лапароскопии. При  нестабильной гемодинамике, большом гемоперитонеуме  показана лапаротомия.

ВНУТРЕННЕЕ ДРЕНИРОВАНИЕ ВЕРХНИХ МОЧЕВЫХ ПУТЕЙ В ЛЕЧЕНИИ ВРОЖДЕННОГО ГИДРОНЕФРОЗА У ДЕТЕЙ

The work analyzes the results obtained during the treatment of 285 children with congenital hydronephrosis aged 3 months to 17 years. Hynes-Andersen caliceal plasty was performed in 200 patients, nephrectomy – in 56 patients and internal renal drainage (as the main method of treatment) – in 17 patients. 192 resected caliceal segments underwent a histological examination.In 26 preparations (13.5%) of young children only inflammatory changes were discovered. This led to surveillance review of patients with hydronephrosis of all grades in young patients using small invasive endoscopic interventions aimed at the restoration of caliceal urodynamics. We used endoscopic appliances, urethral catheters and stents for preliminary bougienage and drainage of an affected organ with the examination of preliminary results.В работе представлен анализ результатов лечения 285 детей с врожденным гидронефрозом в возрасте от 3 месяцев до 17 лет. Пластика прилоханочного сегмента по методике Хайнес-Андерсена-Кучеры проведена 200 больным, нефрэктомия – 56, внутреннее дренирование почки (как основной метод лечения) – 17. Гистологическому исследованию подвергнуто 192 резецированных прилоханочных сегмента. Обнаружение только воспалительных изменений в 26 препаратах (13,5%) у детей младшей возрастной группы позволило пересмотреть тактику ведения больных с гидронефрозом всех степеней у пациентов раннего возраста с применением малоинвазивных эндоскопических вмешательств, направленных на восстановление уродинамики прилоханочных сегментов. Нами использовалась эндоскопическая аппаратура, мочеточниковые катетеры и стенты для проведения предварительного бужирования и дренирования больного органа с изучением предварительных результатов

2νββ2\nu\beta\beta decay of 76^{76}Ge into excited states with GERDA Phase I

Two neutrino double beta decay of $^{76}$Ge to excited states of $^{76}$Se has been studied using data from Phase I of the GERDA experiment. An array composed of up to 14 germanium detectors including detectors that have been isotopically enriched in $^{76}$Ge was deployed in liquid argon. The analysis of various possible transitions to excited final states is based on coincidence events between pairs of detectors where a de-excitation $\gamma$ ray is detected in one detector and the two electrons in the other. No signal has been observed and an event counting profile likelihood analysis has been used to determine Frequentist 90\,\% C.L. bounds for three transitions: ${0^+_{\rm g.s.}-2^+_1}$: $T^{2\nu}_{1/2}>$1.6$\cdot10^{23}$ yr, ${0^+_{\rm g.s.}-0^+_1}$: $T^{2\nu}_{1/2}>$3.7$\cdot10^{23}$ yr and ${0^+_{\rm g.s.}-2^+_2}$: $T^{2\nu}_{1/2}>$2.3$\cdot10^{23}$ yr. These bounds are more than two orders of magnitude larger than those reported previously. Bayesian 90\,\% credibility bounds were extracted and used to exclude several models for the ${0^+_{\rm g.s.}-0^+_1}$ transition

Results on ββ\beta\beta decay with emission of two neutrinos or Majorons in 76^{76}Ge from GERDA Phase I

A search for neutrinoless $\beta\beta$ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10$^{23}$ yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with $^{76}$Ge. A new result for the half-life of the neutrino-accompanied $\beta\beta$ decay of $^{76}$Ge with significantly reduced uncertainties is also given, resulting in $T^{2\nu}_{1/2} = (1.926 \pm 0.095)\cdot10^{21}$ yr.Comment: 3 Figure

Background free search for neutrinoless double beta decay with GERDA Phase II

The Standard Model of particle physics cannot explain the dominance of matter over anti-matter in our Universe. In many model extensions this is a very natural consequence of neutrinos being their own anti-particles (Majorana particles) which implies that a lepton number violating radioactive decay named neutrinoless double beta ($0\nu\beta\beta$) decay should exist. The detection of this extremely rare hypothetical process requires utmost suppression of any kind of backgrounds. The GERDA collaboration searches for $0\nu\beta\beta$ decay of $^{76}$Ge (^{76}\rm{Ge} \rightarrow\,^{76}\rm{Se} + 2e^-) by operating bare detectors made from germanium with enriched $^{76}$Ge fraction in liquid argon. Here, we report on first data of GERDA Phase II. A background level of $\approx10^{-3}$ cts/(keV$\cdot$kg$\cdot$yr) has been achieved which is the world-best if weighted by the narrow energy-signal region of germanium detectors. Combining Phase I and II data we find no signal and deduce a new lower limit for the half-life of $5.3\cdot10^{25}$ yr at 90 % C.L. Our sensitivity of $4.0\cdot10^{25}$ yr is competitive with the one of experiments with significantly larger isotope mass. GERDA is the first $0\nu\beta\beta$ experiment that will be background-free up to its design exposure. This progress relies on a novel active veto system, the superior germanium detector energy resolution and the improved background recognition of our new detectors. The unique discovery potential of an essentially background-free search for $0\nu\beta\beta$ decay motivates a larger germanium experiment with higher sensitivity.Comment: 14 pages, 9 figures, 1 table; ; data, figures and images available at http://www.mpi-hd.mpg/gerda/publi