Interaction of Low Energy Deuterium Plasma With Tungstenand Nano-Structured Tungsten Coatings:from Laboratory Data to Tokamak

The objective of this work is to compare the deuterium retention in bulk tungsten and tungsten coatings exposed to deuterium plasma in well-defined laboratory conditions and complicate tokamak conditions and make reliable prediction for future fusion reactors

Computer simulation of microsystem elements

Компьютерному моделированию подвергнут термоэлектрический микропривод, управляющий положением микрозеркала в микро-опто-электро- механической системе (МОЭМС). Инструментом компьютерного исследования послужил программный комплекс ANSYS в междисциплинарной конфигурации. Верифицированы расчеты угла поворота микрозеркала в зависимости от напряжения, приложенного к пластинам актюатора. Расчетные результаты расходятся с экспериментальными значениями на 10%.The thermoelectric microdrive setting the mirror in micro-opto-electromechanical system (MOEMS) is simulated with aid of ANSYS multiphysics tool. The calculations of rotation angle for mirror depending on voltage difference across the pads of thermal actuators are verified. The difference of calculated results and experimental data does not exceed 10%

Reconstruction of thermo-physical properties to improve material database for casting simulation

In this work, an advanced method is proposed for computational recovery of thermo-physical properties in a wide range from room temperature to values above the alloy melting point. This method allows us to improve material databases of CAE (Computer-Aided Engineering) programs for simulation of high-temperature technological processes. In most cases, computation of unsteady temperature fields is an important stage of CAE analysis in mechanical engineering. Moreover, various manufacturing technologies such as casting, welding, surface hardening, coating, heat treatment provide the desired material structure and its strength by controlling temperature field during solidification and subsequent cooling of a machine part. The problem of reliability in computer modeling arises from the fact that CAE programs usually are not equipped with comprehensive material databases. We have solved this problem especially for casting simulation and molding materials, which can differ in composition at different plants and therefore cannot be combined into a common database. To determine unknown thermo-physical properties, the temperature had been measured in several points of solidifying cylindrical sample initially, and the appropriate computer simulation of the test technology was performed. Then the difference between the calculated and experimental temperatures was minimized using the modified Levenberg-Marquardt optimization algorithm. © Published under licence by IOP Publishing Ltd

Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra

The paper presents new knowledge on primary defect formation in tungsten (W) and iron (Fe) irradiated by fission and high-energy neutrons at near-room temperature. Using a well-established method of positron-annihilation lifetime-spectroscopy (PALS), it was found that irradiation of W in the fission reactor and by high-energy neutrons from the p(35 MeV)-Be generator leads to the formation of small radiation-induced vacancy clusters with comparable mean size. In the case of Fe, smaller mean size of primary radiation-induced vacancy clusters was measured after irradiation with fission neutrons compared to irradiation with high-energy neutrons from the p(35 MeV)-Be generator. It was found that one of the reasons of the formation of the larger size of the defects with lower density in Fe is lower flux in the case of irradiation with high-energy neutrons from the p(35 MeV)-Be source. The second reason is enhanced defect agglomeration and recombination within the energetic displacement cascade at high energy primary knock-on-atoms (PKAs). This is consistent with the concept of the athermal recombination corrected (arc-dpa) model, although the measured dpa cross-section of both fission neutrons and wide-spectrum high-energy neutrons in W is between the conventional Norgett–Robinson–Torrens (NRT-dpa) and arc-dpa predictions. This means that the physics of the primary radiation effects in materials is still not fully known and requires further study through a combination of modeling and experimental efforts. The present data serve as a basis for the development of an improved concept of the displacement process

TRAIN ROUTE DETECTION BASED ON CONVOLUTIONAL NEURAL NETWORKS

In this paper, we propose a method for using convolutional neural networks to segment railway tracks and parts of turnouts in images. Based on the results of such segmentation, the train route was assembled

Analytical model of brittle destruction based on hypothesis of scale similarity

The size distribution of dust particles in nuclear fusion devices is close to the power function. A function of this kind can be the result of brittle destruction. From the similarity assumption it follows that the size distribution obeys the power law with the exponent between -4 and -1. The model of destruction has much in common with the fractal theory. The power exponent can be expressed in terms of the fractal dimension. Reasonable assumptions on the shape of fragments concretize the power exponent, and vice versa possible destruction laws can be inferred on the basis of measured size distributions.Comment: 10 pages, 3 figure

RISK FACTORS AFFECTING THE SURVIVAL OF PATIENTS WITH BLADDER CANCER

Bladder cancer (BC) is consistently among the ten most common malignant neoplasms worldwide. Patients with BC are describe by a high level of postoperative complications and comorbidity. The aim of the study: analysis of risk factors affecting the duration and quality of life of patients with BC

Analysis of the Survival Rate of Cancer Dispensary Patients after Radical Cystectomy

One of the most commonly used surgical operations among patients with bladder cancer is radical cystectomy. An important stage of the operation is the choice of the method urine derivation. The aim of the study: to analyze the survival of patients with three different meth-ods of urine derivation