High-temperature electron hole liquid in diamond wires

The density functional theory is used to study the properties of the electron hole liquid (EHL) in diamond quantum wires. Take a quantum wire with a circular cross section with radius R. Electrons and holes move freely along the z-axis. To calculate the energy and equilibrium density of the EHL, the Schrödinger equations for electrons and holes are solved numerically. Calculations have shown that the EHL is stable in diamond wires with a radius of several exciton radii. As the radius of the quantum wire decreases, the equilibrium density increases and the EHL energy decreases. So, with the radius of the quantum wire equal to the exciton radius (1.38 nm), the equilibrium linear density and energy of the EHL can reach values of 2.2 ∙ 107 cm–1 and – 317 meV, respectively. Estimates show that for these values of density and energy, the critical temperature of the EHL is Tc ≈ 370 K

Decision Support System for Urbanization of the Northern Part of the Volga-Akhtuba Floodplain (Russia) on the Basis of Interdisciplinary Computer Modeling

There is a computer decision support system (CDSS) for urbanization of the northern part of the Volga-Akhtuba floodplain. This system includes subsystems of cognitive and game-theoretic analysis, geoinformation and hydrodynamic simulations. The paper presents the cognitive graph, two-level and three-level models of hierarchical games for the cases of uncontrolled and controlled development of the problem situation. We described the quantitative analysis of the effects of different strategies for the spatial distribution of the urbanized territories. For this reason we conducted the territory zoning according to the level of negative consequences of urbanization for various agents. In addition, we found an analytical solution for games with the linear dependence of the average flooded area on the urbanized area. We numerically computed a game equilibrium for dependences derived from the imitational geoinformation and hydrodynamic modeling of flooding. As the result, we showed that the transition to the three-level management system and the implementation of an optimal urbanization strategy minimize its negative consequences.Comment: 14 pages, 5 figures; Conference: Creativity in Intelligent Technologies and Data Science. CIT&DS 201

Approximate calculation of the basic parameters of energodinamic processes starting and stopping planetary drive

The paper presents a simplified engineering method, which at the stage of conceptual design allows you to define the parameters of the preliminary processes starting and stopping of the planetary drive. Introduction of the proposed simplifications, gives an opportunity to solve a differential equation of motion of the inertial elements of the dynamic model of the drive.В статье представлена упрощенная инженерная методика, которая на стадии эскизного проектирования позволяет определять предварительные параметры процессов включения и остановки планетарного привода. Введение предложенных упрощений дает возможность решить дифференциальное уравнение движения инерционных элементов динамической модели привода

Structural defect creation by swift heavy ions in CaF2 single crystals

Calcium fluoride single crystals belong to the most popular optical materials due to their transparency in a wide spectral region..

АНАЛИЗ ОПАСНОСТИ ПРИ ВЗРЫВЕ МЕТАНОВОГО БАЛЛОНА

Consideration is given to specifics of the explosion of 50 and 80-liter methane cylinders at various operating temperatures. The authors calculated the following parameters of methane-air mixture: radius of the fireball, speed of its spread and amount of the released heat energy. The paper analyzes the fire hazard in the event of damage to methane cylinders of vehicles.Розглянуто особливості вибуху 50-ти і 80-літрових метанових балонів при різних експлуатаційних температурах. Розраховано параметри вибухів метаноповітряної суміші: радіус вогненої кулі, швидкість її поширення, кількість теплової енергії, що виділилася. Проаналізовано пожежну небезпеку при пошкодженні метанових балонів автотранспортних засобів

Sub-inhibitory Effects of Antimicrobial Peptides

Antimicrobials, and particularly antimicrobial peptides (AMPs), have been thoroughly studied due to their therapeutic potential. The research on their exact mode of action on bacterial cells, especially at under sublethal concentrations, has resulted in a better understanding of the unpredictable nature of bacterial behavior under stress conditions. In this review, we were aiming to gather the wide yet still under-investigated knowledge about various AMPs and their subinhibition effects on cellular and molecular levels. We describe how AMP action is non-linear and unpredictable, also showing that exposure to AMP can lead to antimicrobial resistance via triggering various regulatory systems. Being one of the most known types of antimicrobials, bacteriocins have dual action and can also be utilized by microorganisms as signaling molecules at naturally achievable sub-inhibitory concentrations. The unpredictable nature of AMP action and the pathogenic response triggered by them remains an area of knowledge that requires further investigation

Летательный аппарат вертикального взлета и посадки

Стаття присвячена розробці методики розрахунку аеродинамічних характеристик літального апарату с тороподібною несучою поверхнею. Методика дозволить отримати результати розрахунку основних аеродинамічних характеристик та визначити основний принцип польоту ЛА з тороподібною несучою поверхнею.The article is devoted to the development of methods for calculating the aerodynamic characteristics of the aircraft with toropodobnoyu supporting surface. Technique to produce results calculating the basic aerodynamic characteristics and the basic premise of the aircraft with toropodobnoyu supporting surface.Статья посвящена разработке методики расчета аэродинамических характеристик летательного аппарата с тороподобной несущей поверхностью. Методика позволит получить результаты расчета основных аэродинамических характеристик и определить основной принцип полета летательного аппарата с тороподобной несущей поверхностью