Calculation of neutron radiation attenuation factor with Monte Carlo method

В докладе рассматривается моделирование возможных траекторий движения нейтронов с использованием метода Монте-Карло при прохождении сквозь однородную пластину. Представлен разработанный расчетный код на языке программирования С++, с помощью которого можно определить количество поглощенных, отраженных и прошедших через пластину нейтронов. Исходные данные включают характеристики материала, толщину пластины и количество рассчитываемых траекторий. Результаты работы будут использованы для верификации данных, получаемых с помощью высокопрецизионных расчетных кодов.In the report it is considered the simulation of possible neutron trajectories while passing through a homogenous plate with the help of Monte Carlo method. A developed calculated code using C++ programming language is presented. The code can be used to determine the amount of absorbed, reflected and passed through the plate neutrons. The initial data include the material characteristics, plate thickness and amount of calculated trajectories. The results of this work will be used for the verification of data received with calculation codes of high precision

Energetics of metal slabs and clusters: the rectangle-box model

An expansion of energy characteristics of wide thin slab of thickness L in power of 1/L is constructed using the free-electron approximation and the model of a potential well of finite depth. Accuracy of results in each order of the expansion is analyzed. Size dependences of the work function and electronic elastic force for Au and Na slabs are calculated. It is concluded that the work function of low-dimensional metal structure is always smaller that of semi-infinite metal sample. A mechanism for the Coulomb instability of charged metal clusters, different from Rayleigh's one, is discussed. The two-component model of a metallic cluster yields the different critical sizes depending on a kind of charging particles (electrons or ions). For the cuboid clusters, the electronic spectrum quantization is taken into account. The calculated critical sizes of Ag_{N}^{2-} and Au_{N}^{3-} clusters are in a good agreement with experimental data. A qualitative explanation is suggested for the Coulomb explosion of positively charged Na_{\N}^{n+} clusters at 3<n<5.Comment: 11 pages, 6 figures, 1 tabl

DEVELOPING OF SUPPORTING PROGRAM FOR OPERATOR OF EXPERIMENTAL NUCLEAR REACTOR

The report describes a program that simplifies the data preparation for the calculation program of the IVK, which allows the calculation of the ИВВ-2М research reactor campaign. The program is implemented using Qt framework and has graphic user interface. The report presents some features of the program.В работе описывается управляющая программа, упрощающая подготовку данных для расчетной программы ИВК, которая позволяет производить расчет кампании исследовательского реактора ИВВ-2М. Программа реализована с помощью фреймворка Qt и имеет графический интерфейс. В докладе приведены некоторые особенности реализации программы

IRRADIATION OF SAMPLES WITH LITHIUM-CONTAINING CERAMICS AND BERYLLIUM-CONTAINING ALLOYS IN THE IVV-2M REACTOR TO STUDY THE KINETICS OF TRITIUM YIELD

The results of Li-comprising ceramics and Be alloys samples irradiation experiment pos-sibility estimation for the purposes of post irradiation examinations and study of tritium re-lease kinetics are presented. The post irradiation examinations aimed to study mechanical properties of materials

Effectiveness of mebeverine in patients with post-cholecystectomy gastrointestinal spasm: results of prospective observational program “odyssey”

Aim: to assess the effectiveness of mebeverine 200 mg BID in patients with post-cholecystectomy gastrointestinal spasm not requiring surgical treatment. Materials and methods. 218 patients were included in 16 clinical centers in 14 cities in Russia. All patients had post-cholecystectomy gastrointestinal spasms, not requiring surgical treatment and received mebeverine (Duspatalin®) 200 mg BID. The observational assessment period lasted from the moment of their inclusion into the study up to 6 weeks post inlusion. The therapy results were evaluated using visual analog scales (GPA and 11-point numeric rating scale) by patient self-assessment of the dynamics of spasm/discomfort and other post-cholecystectomic gastrointestinal symptoms after 2 and 6 weeks of treatment. Gastrointestinal Quality of Life Index (GIQLI) was used to assess patient quality of life. Results and discussion. All 218 patients completed the 2-week mebeverine treatment course, 101 of them finished the 6-week course (“prolonged population”). Significant positive changes in the relief of abdominal pain and dyspepsia were noted as well as normalization of stool frequency and consistency. A more marked change in values was observed during prolonged (up to 6 weeks) therapy. Both 2-week and 6-week mebeverine courses led to a normalization of patient quality of life. After 6 week therapy, an effect of mebeverine on the quality of life 91% of patients was observed comparable to cholecystectomy itself, speficially related to the quality of life subscore ‘symptoms’. Conclusion. The results of our study demonstrate that mebeverine (Duspatalin®) therapy leads to an effective elimination of clinical symptoms associated with post-cholecystectomy GI-spasm disorders, like abdominal pain, symptoms of dyspepsia and stooldisorders. A more marked change in values was observed during prolonged (up to 6 weeks) therapy

European registry on the management of helicobacter pylori infection (HP-EUREG protocol): The first results of Russian centers

Aim: To assess the clinical practice of diagnosis and treatment in patients with Helicobacter pylori infection and to compare this practice with the international guidelines in the European Registry on the management of Helicobacter pylori infection, Hp-EuReg protocol), a multicenter prospective observational study initiated by the European Helicobacter and Microbiota Study Group. Materials and methods: The data of 813 patients infected with H. pylori and entered in the Hp-EuReg register by the Russian centers in 2013-2015 were analyzed. Results: The most common methods for the primary diagnosis of H. pylori infection are histology (40.3%), rapid urease test (35.7%), and serology (17.2%). The duration of H. pylori eradication therapy was 7, 10, and 14 days in 18.0, 49.3, and 25.1%, respectively. To monitor the effectiveness of treatment, the investigators used a histological examination (34%), a urea breath test (27.3%), H. pylori stool antigen (22.8%), and a rapid urease test (16.3%). A serological test was carried out in 2.5% of the cases. No monitoring was done in 13.5% of the patients. The average eradication efficiency was 82.6%. If the therapy was ineffective, 80% of physicians did not intend to prescribe a new cycle of treatment. Conclusion: Significant differences were found between clinical practice and the current guidelines