Analytical Form of the Deuteron Wave Function Calculated within the Dispersion Approach

We present a convenient analytical parametrization of the deuteron wave function calculated within dispersion approach as a discrete superposition of Yukawa-type functions, in both configuration and momentum spaces.Comment: 3 pages, 2 figure; several minor corrections adde

Deuteron tensor polarization component T_20(Q^2) as a crucial test for deuteron wave functions

The deuteron tensor polarization component T_20(Q^2) is calculated by relativistic Hamiltonian dynamics approach. It is shown that in the range of momentum transfers available in to-day experiments, relativistic effects, meson exchange currents and the choice of nucleon electromagnetic form factors almost do not influence the value of T_20(Q^2). At the same time, this value depends strongly on the actual form of the deuteron wave function, that is on the model of NN-interaction in deuteron. So the existing data for T_20(Q^2) provide a crucial test for deuteron wave functions.Comment: 11 pages, 3 figure

Form Factors of Composite Systems by Generalized Wigner-Eckart Theorem for Poincar\'e group

The relativistic approach to electroweak properties of two-particle composite systems developed previously is generalized here to the case of nonzero spin. This approach is based on the instant form of relativistic Hamiltonian dynamics. A special mathematical technique is used for the parametrization of matrix elements of electroweak current operators in terms of form factors. The parametrization is a realization of the generalized Wigner--Eckart theorem on the Poincar\'e group, form factors are corresponding reduced matrix elements and they have the sense of distributions (generalized functions). The electroweak current matrix element satisfies the relativistic covariance conditions and in the case of electromagnetic current it also automatically satisfies the conservation law.Comment: Submitted to Theor. Math. Phy

Generalized concentration dependence of self-diffusion coefficients in poly(allylcarbosilane) dendrimer solutions

Self-diffusion of three high generations (the fifth, sixth, and seventh) of poly(allylcarbosilane) dendrimer in solutions with deuterated chloroform has been studied over a wide range of macromolecular concentrations (φ). Diffusivity has been measured by NMR with a pulsed gradient of the magnetic field. It is shown that concentration dependences of the dendrimer self-diffusion coefficients (D) can be reduced to the generalized concentration dependence. Over the range of volume concentrations from 0.01 up to 0.55, the curve of the generalized dependence of D for dendrimers coincides with the analogous dependence for globular protein in aqueous solutions. Analogous to the universal concentration dependence of D for linear polymers in solvent, the generalized concentration dependence of dendrimers tends to the asymptote D′(φ)/D0 ∞ φ0 = 1 in the limit of extremely dilute solutions and to the asymptote D(φ)/D0 ∞ φ-3 in the range of concentrated solutions 0.3 < φ < 0.55. Here, D0 - limφ-0 D(φ) and D(φ) are the self-diffusion coefficients of dendrimer in an extremely dilute solution and in a solution with macromolecular concentration φ, respectively. D′(φ) = D(φ)/L(φ), where L(φ) is a normalizing function, taking into account the change of the local mobility of dendritic branches as the macromolecular concentration increases; the L(φ) functions have been experimentally extracted from the concentration dependence of the longitudinal relaxation times for the dendrimers in solutions studied

Development of a method for introducing 1-aminophosphonate fragment in a siloxane matrix

© 2016 Taylor & Francis Group, LLC.A versatile synthetic method for the preparation of 1-aminophosphonate derivatives of methylsiloxane oligomers was developed. The introduction of trimethylsilyl amino protecting groups promotes hydrosilylation. The proposed modeling technique allows entering 1-aminophosphonate fragment into the siloxane skeleton of the matrix structure, as well as into the hydrolytically unstable alkoxy-functionalized organosilicon compounds

Synthesis of methyl(1-aminophosphonate)siloxane oligomers

© 2016, Springer Science+Business Media New York.A synthesis of 1-aminophosphonate derivative of methylsiloxane oligomer was developed. A methodology of the introduction of 1-aminophosphonate fragment not only into the stable siloxane structures, but also into hydrolytically unstable alkoxyfunctional organosilicon compounds was suggested

Synthesis of new organoelement copolymers based on polydimethylsiloxanes and aminophosphonates

© 2018 Based on commercially available 3-Aminopropyl (diethoxy)methylsilane new alkoxysilane with functional aminophosphonate group - diethyl (2-((3-(diethoxy (methyl)silyl)propyl)amino)propan-2-yl)phosphonate were synthesized and characterized. Obtained functional alkoxysilane were transformed to tetrasiloxane in active medium in the presence of acetic acid and then copolymerized with octamethylcyclotetrasiloxane (D4). The chemical structure of the resulting polymer was studied and confirmed by a combination of physical methods, namely,1H,13C,31P and29Si NMR, GPC, and IR spectroscopy. The thermophysical and rheological properties of the polymer were also studied

Self-Diffusion and Nuclear Magnetic Relaxation of Dendritic Macromolecules in Solutions

The self-diffusion and nuclear magnetic relaxation of poly(butylcarbosilane) and poly(allylcarbosilane) dendrimers dissolved in deuterated chloroform and poly(amidoamine) dendrimers with hydroxyl surface groups in solutions with methanol have been studied. The diffusion rates (D) have been measured by the pulsed-field-gradient nuclear magnetic resonance. It is shown that experimental concentration dependences D(φ) obtained for macromolecules in the dendrimer-solvent systems studied can be reduced to a unified view, and thus, the generalized concentration dependence of the normalized diffusion rates of dendrimers can be obtained. In the macromolecular volume concentration range from 0.01 up to 0.55, the generalized dependence of the normalized diffusion rates for dendrimers coincides with the analogous dependence for globular proteins in aqueous solutions; the last result suggests that self-diffusion features of dendrimers and globular proteins are in general similar. It is also shown that the experimental data obtained permit one to characterize the changes of the own monomer density of dendrimers depending on their molecular weight and, as a consequence, to make a conclusion about the swelling of dendritic macromolecules in the solutions studied

Панель управления транспортным средством технологического назначения на электротяге

The proposed design solution refers to elements of land vehicle bodies and namely to control panels of a power truck and it can be used to control vehicles of technological purpose with electric traction, as well as their hinged and trailed equipment. A technical problem of a device coinciding with the positive result from its application is to provide a possibility for controlling hinged or trailed equipment of a transport vehicle of technological purpose with the help of a panel. The control panel has a steering wheel located on its left side mounted on a steering column, a speedometer and a section of vehicle control devices, and there is a control unit for hinged and trailed equipment of the vehicle in the right part of the panel; it is made in the form of a box and there is a group of indicating devices, keypad and two function keys on the outer box surface. The group of indicating instruments includes a line of seven-segment indicators, a text LCD-indicator, a graphic TFT-display, the first and second LEDs indicating the status of hinged and trailed equipment. Indicating devices, keypad and two function keys are electrically connected to the control unit located inside the box. The control unit is based on an industrial microcontroller equipped with a non-volatile memory unit and a USART module connected via an interface converter unit to a radio module.Предложенное конструкторское решение относится к элементам кузовов наземных транспортных средств, а именно – к панелям управления электрокаром, и может применяться для управления транспортными средствами технологического назначения на электротяге, а также их навесным и прицепным оборудованием. Техническая задача устройства, совпадающая с положительным результатом от его применения, – это обеспечение возможности управления с помощью панели навесным или прицепным оборудованием транспортного средства технологического назначения. Панель управления содержит расположенные в ее левой части руль, установленный на рулевой колонке, спидометр и секцию приборов управления транспортным средством, а в правой части панели размещен узел управления навесным и прицепным оборудованием транспортного средства, выполненный в виде короба, на наружной поверхности которого размещены группа приборов индикации, кнопочная клавиатура и две функциональные клавиши. Группа приборов индикации включает в себя: линейку семисегментных индикаторов, текстовый LCD-индикатор, графический TFT-дисплей, первый и второй светодиоды индикации состояния навесного и прицепного оборудования. Приборы индикации, кнопочная клавиатура и две функциональные клавиши электрически соединены с блоком управления, расположенным внутри короба. Блок управления выполнен на основе промышленного микроконтроллера, снабженного блоком энергонезависимой памяти и модулем USART, подключенным через блок преобразователя интерфейсов к радиомодулю

FUNCTIONAL SILOXANES - NEW APPROACHES TO SYNTHESIS AND PROSPECTS FOR THEIR APPLICATION

Работа выполнена при финансовой поддержке РНФ, проект № 22-13-00459