A multi-dimensional numerical scheme for two-fluid Relativistic MHD

The paper describes an explicit multi-dimensional numerical scheme for Special Relativistic Two-Fluid Magnetohydrodynamics of electron-positron plasma and a suit of test problems. The scheme utilizes Cartesian grid and the third order WENO interpolation. The time integration is carried out using the third order TVD method of Runge-Kutta type, thus ensuring overall third order accuracy on smooth solutions. The magnetic field is kept near divergence-free by means of the method of generalized Lagrange multiplier. The test simulations, which include linear and non-linear continuous plasma waves, shock waves, strong explosions and the tearing instability, show that the scheme is sufficiently robust and confirm its accuracy

Tricolor Technique for Visualization of Spatial Variations of Polydisperse Dust in Gas-Dust Flows

The aim of this work is to construct an algorithm for visualizing a polydisperse phase of solid particles (dust) in an inhomogeneous flow of a two-phase gas-dust mixture that would allow us to see, within one plot, the degree of polydispersity of the dust phase and the difference in the spatial distributions of individual fractions of dust particles in the computational domain. The developed technique allows us to reproduce concentrations from one to three fractions of dust particles in each cell in the computational domain. Each of the three fractions of dust particles is mapped to one of the main channels of the RGB palette. The intensity of the color shade is set to be proportional to the relative concentration of dust particles in this fraction. The final image for a polydisperse mixture is obtained by adding images in each of the three color channels. To visualize the degree of polydispersity, I propose depicting the spatial distribution of the entropy of the dust mixture. The definition of the entropy of a mixture is generalized to take into account the states of a mixture with zero number of particles in the mixture. They correspond to dust-free sections of the computational domain (voids). The proposed method for visualizing the polydispersity of a mixture of particles is demonstrated using the example of dynamic numerical modeling of the spatial features of dust structures formed in turbulent gas-dust flows and in flows with shock waves

КАК ПОЛУЧИТЬ ЭКОНОМИЧЕСКИ ЭФФЕКТИВНЫЕ АСФАЛЬТОБЕТОННЫЕ СМЕСИ ДЛЯ УСТРОЙСТВА КОНСТРУКТИВНЫХ ОДЕЖД АВТОМОБИЛЬНЫХ ДОРОГ И УЛИЦ

The paper describes a methodology for evaluation of technical and economic efficiency of asphalt concrete mixture components. The method allows to perform a directed search for new materials which are used for mixture preparation and it also provides an efficient use of monetary funds. Firstly, it is possible to obtain this result due to optimum price-quality ratio of asphalt mixture which is determined by its service life in a pavement; secondly, it is possible to obtain this result due to  exclusion of errors while selecting components of the asphalt mixture out of the whole range applied presently in the world practice.Представлена методика оценки технико-экономической эффективности компонентов асфальтобетонных смесей, позволяющая вести направленный поиск новых материалов для их приготовления, а также обеспечивающая эффективное использование денежных средств. Во-первых, за счет оптимального соотношения между ценой и качеством асфальтобетонной смеси, определяемого сроком ее службы в покрытии, во-вторых, за счет исключения ошибок при выборе компонентов асфальтобетонных смесей из всей гаммы, использующейся в настоящее время в мировой практике

Application of Cytokines and Synthetic Peptides for Increase in Immunogenicity of Melioidosis Antigens

B. pseudomallei 100 resistance (61.5 % of survived animals). It was concluded that it is a good practice to include bestim in the schedule of complex immunization against melioidosis

Does the Constitution Provide More Ballot Access Protection for Presidential Elections Than for U.S. House Elections?

Both the U.S. Constitution and The Federalist Papers suggest that voters ought to have more freedom to vote for the candidate of their choice for the U.S. House of Representatives than they do for the President or the U.S. Senate. Yet, strangely, for the last thirty-three years, the U.S. Supreme Court and lower courts have ruled that the Constitution gives voters more freedom to vote for the candidate of their choice in presidential elections than in congressional elections. Also, state legislatures, which have been writing ballot access laws since 1888, have passed laws that make it easier for minor-party and independent candidates to get on the ballot for President than for the U.S. House. As a result, voters in virtually every state invariably have far more choices on their general election ballots for the President than they do for the House. This Article argues that the right of a voter to vote for someone other than a Democrat or a Republican for the House is just as important as a voter’s right to do so for President, and that courts should grant more ballot access protection to minor-party and independent candidates for the House

Экологобезопасные технологии применения отходов промышленности при регенерации асфальтобетонных покрытий

The development of a technology for the regeneration of used asphalt concrete coatings is presented, provided that industrial wastes are used and environmentally friendly asphalt concrete coatings are obtained. For research, the technology of dispersing and mixing the waste was chosen to achieve its homogeneity and activation of the mixture in order to increase the physicochemical interaction with binders. It was shown that heavy metals contained in waste and in asphalt granulate are reliably blocked in materials based on organohydraulic binders (OHB), their migration to the environment is significantly reduced. With the optimum content of bitumen emulsion and cement, the effect of maximum structural strength of the road building material and maximum fixation of heavy metal ions is observed. The proposed technical solutions are supported with theoretical calculations and allow environmental-friendly regeneration of asphalt concrete pavements.Представлена разработка технологии регенерации отработанных асфальтобетонных покрытий при условии применения отходов промышленности и получения экологически безопасных асфальтобетонных покрытий. Для исследований выбрана технология диспергирования и перемешивания отходов для достижения их однородности и активации смеси с целью повышения физико-химического взаимодействия с вяжущими веществами. Показано, что в материалах на органогидравлических вяжущих тяжелые металлы, содержащиеся в отходах и в асфальтогрануляте, надежно блокируются, их миграция в окружающую среду существенно снижается. При оптимальном содержании битумной эмульсии и цемента наблюдается эффект максимальной структурной прочности дорожностроительного материала и максимальной фиксации ионов тяжелых металлов. Предложенные технические решения обоснованы теоретическими расчетами и позволяют осуществлять экологобезопасную регенерацию асфальтобетонных покрытий

Transparent memory testing methods overview

В статье представлен обзор методов периодического неразрушающего тестирования схем памяти. Основное внимание уделено неразрушающим аналогам классических маршевых ал- горитмов. Рассмотрен получивший широкое распространение метод Николаидиса, а также новые методы, основанные на локальной и глобальной симметрии данных. Приведена срав- нительная оценка эффективности использования рассмотренных методов

Symmetric transparent memory testing

В статье представлены локально-симметричные методы периодического неразрушающего тестирования схем ОЗУ. Приведена оценка эффективности использования предлагаемых методов в сравнении с существующими методами Николаидиса и глобально- симметричными методами

AERODYNAMIC STEERING WHEEL OF A HYPERSONIC AIRCRAFT IN THE CONDITIONS OF ITS AERODYNAMIC HEATING

FIELD: astronautics. SUBSTANCE: invention relates to rocket engineering. Aerodynamic steering wheel of a hypersonic aircraft contains a spar, a skin and a plate made of heat-conducting material with a melting point below the melting point of the skin that is spring loaded from the side member to the leading edge. Plate has a surface coating of a material having a melting point below the melting point of the plate material. Internal cavity of the skin has grooves for removal of the melted material of the plate. EFFECT: invention is aimed at improving the reliability of the structure during aerodynamic heating.Изобретение относится к ракетной технике. Аэродинамический руль гиперзвукового летательного аппарата содержит лонжерон, обшивку и пластину из теплопроводного материала с температурой плавления ниже температуры плавления обшивки, которая подпружинена от лонжерона к передней кромке. Пластина имеет поверхностное покрытие из материала, имеющего температуру плавления ниже температуры плавления материала пластины. Внутренняя полость обшивки имеет канавки для отвода расплавленного материала пластины. Изобретение направлено на повышение надежности конструкции при аэродинамическом нагреве