Electrical and photoelectric properties of thin polymer films –polyphenylquinoline derivative
Electrical and photoelectric properties of thin polymer films –polyphenylquinoline derivative
S. R. Saitov$^1$, D. V. Amasev$^2$, A. R. Tameev$^3$, V. V. Malov$^3$, A. G. Kazanskii$^1$
In this paper, the electrical and photoelectric properties of thin films of polyphenylquinoline containing the phenylamine bridging group and 2,1,3-benzothiadiazole moiety are studied. An analysis of the conductivity and photoconductivity temperature dependences indicates hopping mechanism of conductivity over localized states, which are separated from Fermi level by an energy 0.85-1.0 eV. The activation energy of the charge carriers mobility is 0.2 eV. From the analysis of the photoconductivity and the absorption coefficient spectral dependences, estimate of the optical width of the investigated material band gap was obtained equal to 1.8-1.9 eV, and an exponential behavior of the density distribution function of states within the band gap near the zones edges was determined. The analysis of the photoconductivity lux-ampere dependences indicates a bimolecular recombination of nonequilibrium charge carriers in the investigated material at room temperature.
Show AbstractHeritage Fourier and problems of modernization of the course of mathematical analysis for physicists
Heritage Fourier and problems of modernization of the course of mathematical analysis for physicists
D. D. Sokoloff
Fourier lived and worked in an era when, in the studies on mathematical analysis, the first, heroic period and began a long period of ordering, improvement and strict presentation initial ideas. During this period, new and wonderful ideas were formulated, but the spirit of the era defined The form and style of the presentation of those classical textbooks on mathematical analysis, according to which we now teach students. In the modern era, classical mathematics increasingly interacts with the mathematics of the computer age. This forces us to introduce new elements into seemingly well-established sections of mathematical analysis
Show AbstractWhat can we learn about the properties of atomic nuclei from the mass table? Scientific and educational aspects
What can we learn about the properties of atomic nuclei from the mass table? Scientific and educational aspects
E. V. Vladimirova$^{1,2}$, I. D. Dashkov$^1$, B. S. Ishkhanov$^{1,2}$, T. Yu. Tretyakova$^2$
Information on the masses of atomic nuclei is becoming more accessible every year, both due to the increase in the number of open isotopes, and due to the refinement of the available data. Consequently, the phenomenological approach to the study of the properties of atomic nuclei through mass ratios is becoming more and more appropriate. Mass relations are considered and their relationship with the properties of the atomic nucleus is shown in this article. This approach can be effectively used for educational purposes due to its simplicity. A large number of mass relations, as well as a significant amount of the constantly updated base of atomic nuclei, require the automation of the calculation and visualization of mass characteristics in various nuclear chains. The MaRel program designed to solve this problem is described in this article.
Show AbstractQuick estimation of registration efficiency of radioactive decays used in EXO-200 experiment
Quick estimation of registration efficiency of radioactive decays used in EXO-200 experiment
V. A. Belov
During study of cosmogenic background sources in EXO-200 experiment we obtained a list of 1689 isotopes, produced by passing of cosmic muons. Here we describe a method that allowed to estimate which isotopes from the list don't have a significant impact on a low-background data from the detector. Using this method we excluded more than 98~\% from the list with reasonable consumption of computing resources. This method might be useful in other cases of study of processes of material activation.
Show AbstractSimulation of absorbed dose distribution in objects with complex configuration
Simulation of absorbed dose distribution in objects with complex configuration
N. P. Chirskaya, L. S. Novikov, V. V. Sinolits
This paper considers the possibilities of different mathematical methods application to the problem of the absorbed dose calculation in objects with a complex configuration. The simulation results of the absorbed dose distribution in a spherical water detector placed inside a spherical shield due to protons of galactic cosmic rays with energy in the range 101 − 105 MeV are presented.
Show AbstractStudying of 14.1 MeV neutrons inelastic scattering on light nuclei
Studying of 14.1 MeV neutrons inelastic scattering on light nuclei
N. A. Fedorov$^{1,2}$, T. Yu. Tretyakova$^3$, D. N. Grozdanov$^{1,4}$, V. M. Bystritskiy$^1$, Yu. N. Kopach$^1$, I. N. Ruskov$^{1,4}$, V. R. Skoy$^1$, N. I. Zamyatin$^1$, D. .. Wang$^{1,5}$, F. A. Aliev$^{1,6}$, C. .. Hramco$^{1,7}$, A. .. Gandhi$^8$, A. .. Kumar$^8$, M. G. Sapozhnikov$^1$, Yu. N. Rogov$^1$, E. A. Razinkov$^1$, S. .. Dabylova$^1$
The characteristic gamma radiation from the interaction of 14.1 MeV neutrons with a SiO2 and H2O sample is investigated with Tagged Neutron Method (TNM). The anisotropies of gamma-ray emission of 1.779 MeV from silicon and 6.13 MeV from oxygen were measured at 11 azimuth angles with a step of ∠15◦. The present results are in good agreement with some recent experimental data.
Show AbstractA new mechanism for the action of continuous and pulsed UV-C radiation on water
A new mechanism for the action of continuous and pulsed UV-C radiation on water
I. M. Piskarev$^1$, K. A. Astaf'eva$^2$, I. P. Ivanova$^2$
The formation of hydrogen peroxide in bidistilled water under the influence of UV-C radiation from a low-pressure mercury lamp DKB-9 was studied. The yield of hydrogen peroxide was (1 ± 0.2) · 10−7 mol (ls) −1. The wavelengths of radiation are estimated, under the influence of which the formation of H2O2 is possible. It was assumed that the intermediate product of the reaction formed directly under the action of radiation is the radical HO2•/O2•−. Oxidation-reduction reactions in aqueous solutions containing F e2+, F e3+ and I− ions at pH values from 0.8 to 8.1 were studied for its identification. The quantum yield of the HO2• radicals in an acidic medium under the action of mercury lamp radiation is 0.015 ± 0.005
Show AbstractThermostimulated hinge for transformable space structures
Thermostimulated hinge for transformable space structures
P. G. Babaevskiy, N. A. Kozlov, I. G. Agapov, O. A. Nevolko
The article describes the design and testing of a thermally stimulated hinge made from polymeric composite material with shape memory effect for transformable space structures. Simulation of the hinge heating process using the ANSYS Workbench program under various environmental and heating conditions was carried out to determine the power of the heat sources and the selection of the heaters. An experimental study of the hinge heating process under ordinary conditions using built-in heaters is carried out, and the degree, time and effort of restoring it to the shape are determined. The received results testify to high working capacity of the developed thermostimulated hinge and the possibility of its use in transformable space structures.
Show AbstractModeling the production of B mesons in pp collisions at LHC energies
Modeling the production of B mesons in pp collisions at LHC energies
I. I. Ovcharov, L. N. Smirnova
The spectra of the transverse momentum for B mesons of various types in pp interactions at center-of-mass energies 7 and 13 TeV were simulated with PYTHIA 8 event generator. Spectrum ratios for B mesons of different nature and the energy dependence of these distributions in the interval 7-13 TeV were obtained. It is shown that the spectra become more hard with increase of the proton collision energy.
Show AbstractDevelopment and research of carbon plastics with shape memory effect, which have the required thermomechanical characteristics and inversion properties
Development and research of carbon plastics with shape memory effect, which have the required thermomechanical characteristics and inversion properties
A. A. Slyusarev, P. G. Babaevskiy, G. M. Reznichenko
The purpose of the study is to develop and investigate polymeric composite materials (carbon plastics) with thermally stimulated shape memory effect (TS SME) for an ultralight controlled, reversibly transforming structural member of picosatellites solar cells. Research aims on the development of a polymer matrix with TS SME and high glass transition temperature in the cured state (Tg over 140°C) and reinforced laminated carbon plastics on its basis. A polyetherurethane-epoxy (PEU-E) composition cured by diaminodiphenylmethane was developed and kinetics of its curing was investigated by the dielectric analysis method (DEA) for selecting of carbon plastics compression modes. The effect of the composition curing conditions on its Tg was studied and the reversible temperature of the TS SME development by the dynamic mechanical analysis (DMA) method of was determined. The last stage of the work was the TS SME realization studies – force and deployment angle kinetics dependence on the number of carbon fabric layers and its volume content in reinforced laminated carbon plastics specimen.
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