Multibit failures of the spacecraft's onboard electronics from a single particle of cosmic radiation
Multibit failures of the spacecraft's onboard electronics from a single particle of cosmic radiation
N. G. Chechenin, N. V. Novikov, A. A. Shirokova
The analysis of the effect of high-energy protons of space radiation on the onboard electronics of the spacecraft is carried out. It is shown that protons can cause nuclear reactions with atomic nuclei of electronics material. The residual nuclei formed as a result of a nuclear reaction have sufficiently high energy to cross the sensitive areas of several bits of electronics, and the high ionizing ability of nuclear fragments allows generating an excess charge of carriers exceeding the critical charge for the failure to occur simultaneously in several bits of the electronic device
Show AbstractAnomalous band bending in the (K$_{0.8}$Na$_{0.2}$)$_{0.8}$Fe$_{1.8}$Se$_2$ superconductor
Anomalous band bending in the (K$_{0.8}$Na$_{0.2}$)$_{0.8}$Fe$_{1.8}$Se$_2$ superconductor
L. L. Lev$^{1,2,3}$, T. E. Kuzmicheva$^{2,3}$, S. A. Kuzmichev$^{2,3}$, A. M. Lebedev$^5$, V. G. Nazin$^5$, R. G. Chumakov$^5$, A. I. Shilov$^3$, E. O. Rahmanov$^{3,4}$, I. V. Morozov$^4$
Iron dichalcogenides intercalated with alkali metal atoms attract the attention of physicists due to their unusual natural phase separation, in which superconducting clusters are formed at the boundaries of the antiferromagnetic phase. In this work, using photoelectron spectroscopy technique, we discovered an unusual effect that presumably arises due to this phase separation. We studied the temperature dependences of the photoelectron spectra of Se 3d, Fe 3p and the valence band at temperatures above and below $T_c \approx 27$~К of the compound (K$_{0.8}$Na$_{0.2}$)$_{0.8}$Fe$_{1.8}$Se$_2$ with a unique substitution of alkali metal atoms. A strong temperature dependence of both the valence band and core levels was discovered: we observed a strong broadening of the spectra, which monotonically decreased with increasing sample temperature, while the temperature changes were cyclic. We believe that this broadening is associated with the appearance of space charges in the dielectric matrix, which leads to band bending. Moreover, the shape of the potential arising inside a given compound was reconstructed, and an estimate was obtained for the relative amounts of dielectric and superconducting phases. The results obtained will help to better understand the physical processes occurring in this compound.
Show AbstractDetermination presence of packaging defects in palladium-based alloys by X-ray diffraction method.
Determination presence of packaging defects in palladium-based alloys by X-ray diffraction method.
O. V. Akimova
Alloys studied in this work are of interest for the needs of hydrogen energy, electronics, pharmacology. The aim of the research is to reveal regularities of defect subsystems development, which is necessary for development of processes to improve performance of metallic systems. Probability of the presence in palladium-based membrane alloys of two-dimensional lattice defects affecting the structure-sensitive properties of materials - packing defects (PD) - are assessed. The analysis of lattice imperfections of Pd93.5In6.0Ru0.5 (numerical indices-mass.%), Pd100-xPbx (x=5, 8, 12, 16, 20 mass.%) alloys was performed according to the results of X-ray diffraction using synchrotron radiation (SR) of the Kurchatov Research Center. The dependence of probability of PD formation on the concentration and grade of the palladium doping element has been established.
Show AbstractThe tardigrade radioprotective protein Dsup (damage suppressor) is resistant\\ to~high doses of ionizing radiation
The tardigrade radioprotective protein Dsup (damage suppressor) is resistant\\ to~high doses of ionizing radiation
M. P. Zarubin$^1$, A. F. Nizamieva$^{1,2}$, S. I. Alexeev$^1$, S. V. Mitrofanov$^1$, Yu. E. Gorshkova$^{1,2}$, E. V. Kravchenko$^1$
The unique Dsup protein of the tardigrade Ramazzottius varieornatus increases resistance to radiation and oxidative stress in various species of organisms and in human cell culture. According to modeling data, Dsup forms a complex with DNA with an intermolecular distance of ~4 Å, as a result of which DNA is less damaged by reactive oxygen species formed during exposure to radiation. However, the stability of the Dsup protein itself under the influence of ionizing radiation remains unclear, which is important for assessing its radioprotective potential and understanding the molecular mechanisms of the action of this protein under conditions of high doses of radiation. In this work, the radiation degradation of the Dsup protein after γ-ray irradiation by small-angle X-ray scattering (SAXS) and protein electrophoresis in polyacrylamide gel under denaturing conditions (SDS-PAGE) was studied for the first time. It has been shown that, in contrast to the control bovine serum albumin, the spatial and structural characteristics of the Dsup protein remain almost unchanged even when exposed to high doses of radiation (5 and 10 kGy), which suggests its high radiation stability.
Show AbstractA model of surface nanorelief formation under gas cluster ion beam irradiation
A model of surface nanorelief formation under gas cluster ion beam irradiation
D. R. Bessmertniy, A. E. Ieshkin
A model for the evolution of surface nanorelief under irradiation with gas cluster ions is proposed. The model is based on consideration of individual collisions of clusters with a surface. The amount of substance sputtered from the collision area and the efficiency of its redeposition onto other surface elements are determined. The performance of the model is shown when compared with experimental data. The stages of smoothing of a harmonic relief are studied. A new measure of the effectiveness of surface smoothing is proposed.
Show AbstractOn blow-up and on global existence of weak solutions to Cauchy problem for some nonlinear equation of the pseudoparabolic type
On blow-up and on global existence of weak solutions to Cauchy problem for some nonlinear equation of the pseudoparabolic type
I. K. Katasheva, M. O. Korpusov, A. A. Panin
It is a brief exposition of results of the investigation of Cauchy problem for some nonlinear equation of pseudoparabolic type that is a generalisation of some model of semiconductor theory.
Show AbstractExperimental study of the interaction of wind with a wave induced by a wave producer in a direct channel
Experimental study of the interaction of wind with a wave induced by a wave producer in a direct channel
I. N. Ivanova$^{1,2}$, O. N. Melnikova$^2$
An experimental study of the effect of wind blowing a wave induced by a wave generator in a direct channel has been carried out. It is shown that at low wave steepness ak < 0.1 and wind speed W < 2.3 m/s, a drift current occurs on the water surface due to the influence of viscous forces. A formula for calculating its velocity is proposed. It is found that the phase velocity of the wave increases with the appearance of a drift flow and can be calculated using the formula obtained for linear waves on a flow with a constant velocity shift. With an increase in the steepness of the wave ak > 0.19 and an increase in wind W > 2.3 m/s, the formation of a vortex deforming the water surface was detected in the air flow above the top of the wave crest. The vortex destroys the viscous layer, reducing the drift velocity. At the same time, the phase velocity and wavelength decrease. A mechanism explaining this process is proposed.
Show AbstractSeismotectonics of Russian segment of the Arctic
Seismotectonics of Russian segment of the Arctic
E. V. Vioronina
The paper considers the foci of the most severe earthquakes in the Russian segment of the Arctic that occurred during the entire observation period, from 1976 to the present. The stress and strain fields were studied by analyzing the tensor of the seismic moment of registered earthquakes. This analysis is being conducted for the first time. Spatial distributions of the Lode-Nadai coefficient and the rate of seismotectonic deformation are obtained.
Show AbstractElastic neutrino scattering on nucleons and neutrino electromagnetic properties
Elastic neutrino scattering on nucleons and neutrino electromagnetic properties
K. A. Kouzakov$^1$, F. M. Lazarev$^2$, A. I. Studenikin$^2$
We study the electromagnetic contribution to elastic neutrino-nucleon scattering processes. The neutrino electromagnetic charge, magnetic, electric, and anapole form factors of both diagonal and transition types in the mass basis are taken into account in the present formalism. When treating the nucleon electromagnetic vertex, we take into account not only the charge and magnetic form factors of a nucleon, but also its electric and anapole form factors. We examine the effects of the neutrino magnetic moment on elastic neutrino-nucleon scattering and how they can be disentangled from those of the strange form factors contributions to the nucleon’s weak neutral current.
Show AbstractInfluence of the Bound Electron-Hole Pairs Dissociation Probability Field Dependence Form on the Photocurrent and Spatial Resolution of Organic Field Phototransistors
Influence of the Bound Electron-Hole Pairs Dissociation Probability Field Dependence Form on the Photocurrent and Spatial Resolution of Organic Field Phototransistors
V. A. Trukhanov
In this work, numerical simulations are used to study ambipolar organic field-effect phototransistors, in which a spatially localized photoelectric effect can take place. This effect consists in the fact that there is a small spatially localized photosensitive region in the transistor channel, the position of which can be controlled by changing the gate voltage. The purpose of this work is to analyze the relationship between the form of the field dependence of the bound electron-hole pairs (e/h pairs) dissociation probability and characteristics of the studied ambipolar phototransistors such as normalized photocurrent, spatial resolution, and response time. It is shown that the optimal form of the field dependence of e/h pairs dissociation probability is stepwise-like form, which can provide a high spatial resolution at high values of the normalized photocurrent without degrading the response time of the phototransistor. This shape can be achieved when the organic semiconductor has an extremely narrow distribution of e/h pairs by size, described by the delta function.Also, on the example of several distributions of various shapes, it is shown that a decrease in the width of the distribution leads to an increase in the spatial resolution.Approaches to the selection and modification of organic semiconductor materials that would provide the most pronounced spatially localized photoelectric effect in ambipolar field-effect transistors are discussed.
Show Abstract