Применение алмазных разверток для обработки прецизионных отверстий

The problems concerning the improvement of machining accuracy and higher productivity while manufacturing cylinder mirrors of motorcycle engines have been investigated. The paper shows that while using diamond reaming accuracy, roughness and productivity of engine cylinder machining significantly exceed similar parameters of conventional methods.Рассмотрены вопросы повышения точности обработки и производительности при изготовлении зеркала цилиндров двигателей мотоциклов. Показано, что при алмазном развертывании точность, шероховатость и производительность обработки цилиндров двигателей значительно превышает аналогичные параметры традиционно используемых методов

Mancha3D code: Multi-purpose Advanced Non-ideal MHD Code for High resolution simulations in Astrophysics

The Mancha3D code is a versatile tool for numerical simulations of magnetohydrodynamic processes in solar/stellar atmospheres. The code includes non-ideal physics derived from plasma partial ionization, a realistic equation of state and radiative transfer, which allows performing high quality realistic simulations of magneto-convection, as well as idealized simulations of particular processes, such as wave propagation, instabilities or energetic events. The paper summarizes the equations and methods used in the Mancha3D code. It also describes its numerical stability and parallel performance and efficiency. The code is based on a finite difference discretization and memory-saving Runge-Kutta (RK) scheme. It handles non-ideal effects through super-time stepping and Hall diffusion schemes, and takes into account thermal conduction by solving an additional hyperbolic equation for the heat flux. The code is easily configurable to perform different kinds of simulations. Several examples of the code usage are given. It is demonstrated that splitting variables into equilibrium and perturbation parts is essential for simulations of wave propagation in a static background. A perfectly matched layer (PML) boundary condition built into the code greatly facilitates a non-reflective open boundary implementation. Spatial filtering is an important numerical remedy to eliminate grid-size perturbations enhancing the code stability. Parallel performance analysis reveals that the code is strongly memory bound, which is a natural consequence of the numerical techniques used, such as split variables and PML boundary conditions. Both strong and weak scalings show adequate performance up till several thousands of CPUs

Application of Diamond Reamers for Machining Precision Holes in Engineering Industry

The problems concerning the improvement of machining accuracy and higher productivity while manufacturing cylinder mirrors of motorcycle engines have been investigated. The paper shows that while using diamond reaming accuracy, roughness and productivity of engine cylinder machining significantly exceed similar parameters of conventional methods

Low-temperature magnetoresistance of GaSb whiskers

Transverse and longitudinal magnetoresistancies in n-type GaSb whiskers with different doping concentration (Te) in the vicinity to the metal-insulator transition (MIT) from metal side of the transition were studied in the temperature range 1.5–60 K and magnetic field 0–14 T. Shubnikov-de Haas oscillations in GaSb whiskers at low temperatures were revealed in magnetic field range 2–12 T. The oscillation period 0.025 T⁻¹ was found at various doping concentration in GaSb whiskers. The effective mass of electrons m c = 0.041 m ₀ and Dingle temperature of about 7.5 K were found in GaSb whiskers with impurity concentration in the vicinity to MIT. The presence of negative magnetoresistance in GaSb whiskers with the impurity concentration in the nearest approximation to MIT with resistivity ρ ₃₀₀ K = 0.0053 Ω cm was observed and associated with weak localization. Besides for the whiskers a resistance minimum was observed at temperature about 16 K that is connected with Kondo effect. Magnetoresistance studies of n-type conductivity for GaSb whiskers revealed the crossover from weak localization to antilocalization in the temperature range of 1.4–4.2 K and magnetic fields below 1 T

Abstracts of The IX Annual International Scientific-Practical Conference; Medicine Pressing Questions

This book contains the abstracts of the papers presented at The IX Annual International Scientific-Practical Conference “MEDICINE PRESSING QUESTIONS”, III Satellite Forum “Public Health and Healthcare Politics” and The III Simulation Training “LAPAROSCOPIC SURGERY” organized by NGO “Young Doctors of Azerbaijan” held on May 6-8, 2020, Baku, AZERBAIJAN. This abstract book contains few abstracts in English language and few abstracts in Russian language

Abstracts of The IX Annual International Scientific-Practical Conference; Medicine Pressing Questions

This book contains the abstracts of the papers presented at The IX Annual International Scientific-Practical Conference “MEDICINE PRESSING QUESTIONS”, III Satellite Forum “Public Health and Healthcare Politics” and The III Simulation Training “LAPAROSCOPIC SURGERY” organized by NGO “Young Doctors of Azerbaijan” held on May 6-8, 2020, Baku, AZERBAIJAN. This abstract book contains few abstracts in English language and few abstracts in Russian language