Temperature dependence of the probability of "small heating" and total losses of ucns on the surface of fomblin oils of different molecular mass

We measured the temperature dependence of the probability of small heating and total losses of UCNs on the PFPE Fomblin Y surface with various molecular masses Mw=2800, 3300, 6500 amu in the temperature range of 100-300 K. The probability of small heating sharply decreases with increasing Mw and decreasing temperature. The probability of total loss weakly decreases with decreasing temperature and takes the minimum value at Mw=3300 amu. As this oil provides a homogeneous surface with minimal probabilities of small heating and total losses of UCNs, it is the preferred candidate for experiments on measuring the neutron lifetime

Quasi-specular albedo of cold neutrons from powder of nanoparticles

We predicted and observed for the first time the quasi-specular albedo of cold neutrons at small incidence angles from a powder of nanoparticles. This albedo (reflection) is due to multiple neutron small-angle scattering. The reflection angle as well as the half-width of angular distribution of reflected neutrons is approximately equal to the incidence angle. The measured reflection probability was equal to ~30% within the detector angular size that corresponds to 40-50% total calculated probability of quasi-specular reflection

Experience of mass application of e-learning in Volgatech university

Important aspects of mass application of e-learning technologies in Volga Techuniversity are considered. The main difficulties and results of introduction are analyzed.Рассматриваются важные аспекты массового внедрения технологий электронного обучения на первом курсе Волгатеха. Анализируются основные трудности и результаты внедрения

UCN Source at an External Beam of Thermal Neutrons

We propose a new method for production of ultracold neutrons (UCNs) in superfluid helium. The principal idea consists in installing a helium UCN source into an external beam of thermal or cold neutrons and in surrounding this source with a solid methane moderator/reflector cooled down to ∼4 K. The moderator plays the role of an external source of cold neutrons needed to produce UCNs. The flux of accumulated neutrons could exceed the flux of incident neutrons due to their numerous reflections from methane; also the source size could be significantly larger than the incident beam diameter. We provide preliminary calculations of cooling of neutrons. These calculations show that such a source being installed at an intense source of thermal or cold neutrons like the ILL or PIK reactor or the ESS spallation source could provide the UCN density 10 5 cm −3 , the production rate 10 7 UCN/s −1 . Main advantages of such an UCN source include its low radiative and thermal load, relatively low cost, and convenient accessibility for any maintenance. We have carried out an experiment on cooling of thermal neutrons in a methane cavity. The data confirm the results of our calculations of the spectrum and flux of neutrons in the methane cavity

The High-Acceptance Dielectron Spectrometer HADES

HADES is a versatile magnetic spectrometer aimed at studying dielectron production in pion, proton and heavy-ion induced collisions. Its main features include a ring imaging gas Cherenkov detector for electron-hadron discrimination, a tracking system consisting of a set of 6 superconducting coils producing a toroidal field and drift chambers and a multiplicity and electron trigger array for additional electron-hadron discrimination and event characterization. A two-stage trigger system enhances events containing electrons. The physics program is focused on the investigation of hadron properties in nuclei and in the hot and dense hadronic matter. The detector system is characterized by an 85% azimuthal coverage over a polar angle interval from 18 to 85 degree, a single electron efficiency of 50% and a vector meson mass resolution of 2.5%. Identification of pions, kaons and protons is achieved combining time-of-flight and energy loss measurements over a large momentum range. This paper describes the main features and the performance of the detector system

Electron accelerator for energy up to 5.0 MeV and beam power up to 50 kW with Х-ray converter

The paper describes the industrial electron accelerator ILU-10 for electron energy up to 5 MeV and beam power up to 50 kW specially designed for use in industrial applications. The ILU-10 accelerator generates the vertical electron beam. The beam line turns the beam through an angle of 90° and transports the beam to the vertically posed Xray converter to generate the horizontal beam of X-rays.Приводиться опис прискорювача електронів ІЛУ-10 на енергію 5 МеВ потужністю 50 кВт, спеціально розробленого для таких комплексів. Для спрощення конструкції конвеєрної системи подачі оброблюваної продукції в зону опромінення використовується випускний пристрій з поворотом пучка на 90 градусів інаступною конвертацією електронного пучка в гамма-випромінювання на вертикально розташованій мішені.Приводится описание ускорителя электронов ИЛУ-10 на энергию 5 МэВ мощностью 50 кВт, специально разработанного для таких комплексов. Для упрощения конструкции конвейерной системы подачи обрабатываемой продукции в зону облучения используется выпускное устройство с поворотом пучка на 90 градусов и последующей конвертацией электронного пучка в гамма-излучение на вертикально расположенной мишени

Резекция единственной функционирующей почки при опухолях почечной паренхимы

Aim: to evaluate results of partial nephrectomy for patients with a solitary kidney performed at the N.N. Blokhin Cancer Center.Materials and methods: medical data of 131 patients with solitary kidney tumors underwent partial nephrectomy at the Department of Urology of the N.N. Blokhin Russian Cancer Research Center from 1980 to 2015 were collected. Median age was 57 (26–75) years, a maleto-female ratio was 1:1.2. Median RENAL score was 7.0 ± 2.4. In all cases, chronic kidney disease was initially diagnosed (stage III – 30 (22.9 %), stage IV–V – 0 (0 %)). Median follow-up for all patients was 55 (6–386) months.Results. The rate of intraoperative complications was 9.2 % (12/131), the rate of postoperative complications was 26.9 % (35/131) (severity grade II – 23 (17.6 %), III – 10 (7.7 %), IV – 1 (0.8 %), V – 1 (0.8 %)). Acute renal failure was observed in 69 (52.7 %) cases, acute dialysis was necessary in 6 (4.6 %) patients. Progression of chronic kidney disease was observed in 58 (44.6 %) patients, hemodialysis was demanded for 2 (1.5 %) patients. Histological study revealed renal cell carcinoma in 124 (94.6 %) samples, positive surgical margins were in 2 (1.5 %) samples. No local recurrences in the resection area were observed. Overall 5- and 10-year survival for all patients with renal cell carcinoma was 89.6 and 72.0 %, specific survival was 93.5 and 81.3 %, recurrence-free survival was 85.3 and 62.2 % respectively.Conclusion. Partial nephrectomy is an effective method of treatment in of solitary kidney tumors associated with satisfactory functional and oncological outcomeЦель: изучение непосредственных и отдаленных результатов серии резекций единственной функционирующей почки, выполненной в РОНЦ им. Н.Н. Блохина. Материал: отобраны данные 131 пациента с опухолью почечной паренхимы единственной функционирующей почки, подвергнутого резекции в отделении урологии РОНЦ им. Н.Н. Блохина с 1980 по 2015 гг. Медиана возраста - 57,0 (26-75) лет, соотношение мужчин и женщин – 1:1,2. Медиана суммы баллов по нефрометрической шкале RENAL составила 7±2,4. Во всех случаях исходно установлен диагноз хронической болезни почек (ХБП) (ХБП ≥3 стадии - 30 (22,9%), ХБП 4-5 стадий – 0 (0,0%)). Медиана наблюдения за всеми пациентами составила 55 (6-386) месяцев. Результаты: частота интраоперационных осложнений – 9,2% (12/131), послеоперационных осложнений – 26,9% (35/131) (степень тяжести II - 23 (17,6%), III – 10 (7,7%), IV – 1 (0,8%), V – 1 (0,8%)). Острое снижение почечной функции зарегистрировано в 69 (52,7%) случаев и потребовало проведения острого диализа у 6 (4,6%) больных. Прогрессирование ХБП зарегистрировано у 58 (44,6%) больных, программный гемодиализ проводится 2 (1,5%) пациентам. Гистологическое исследование выявило рак почки в 124 (94,6%) образца, клетки опухоли по краю разреза имелись в 2 (1,5%) образцах. Местных рецидивов в зоне резекции не было. Пяти- и десятилетняя общая выживаемость всех больных раком почки составила 89,6% и 72,0%, специфическая – 93,5% и 81,3%, безрецидивная – 85,3% и 62,2% соответственно. Заключение: резекция единственной почки – эффективный метод лечения опухолей почечной паренхимы, обеспечивающий хорошие функциональные и онкологические результаты