bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electromagnetic design of the low beta cavities for the JAEA ADS
Authors: Yee-Rendon B , Kondo Y , Maekawa F , Meigo S , Tamura J 
Published: December 2019

Abstract
The Japan Atomic Energy Agency (JAEA) is designing a superconducting CW proton linear accelerator for the ADS project. The superconducting region will use five types of radio frequency cavities. In the region from 2 to 180 MeV the acceleration will be done using Half Wave Resonator (HWR) and Single Spokes (SS) cavities. HWR cavities will accelerate the beam from 2 to 10 MeV with a geometrical beta of 0.08 and the SS ones will do from 10 to 180 MeV using two cavity families with geometrical betas of 0.16 and 0.43. The results of electromagnetic model design are presented and the comparison with similar cavities from other projects are included.
Modelling of electron acceleration in relativistic supernovae
Authors: Romansky V I , Bykov A M , Osipov S M 
Published: December 2019

Abstract
Radio and X-ray observations revealed a rare but a very interesting class of supernovae (SNe) with a sizeable fraction of the kinetic energy of ejecta moving with a trans-relativistic speed. These relativistic SNe are comprising a population of the objects intermediate between the numerous core collapse SNe expanding with non-relativistic velocities and the gamma-ray bursts with highly relativistic ejecta. An interpretation of the observed non-thermal emission from relativistic SNe requires a model of electron acceleration in trans-relativistic shocks. In this paper we present numerical Particle-in-Cell (PIC) simulation of electron spectra in trans-relativistic shock waves propagating in clumped stellar winds of the SN progenitors. It is shown here that the presence of background magnetic fluctuations has a drastical effect on the electron acceleration by the trans-relativistic shocks propagating transverse to the regular magnetic field in the clumped wind of a massive progenitor star.
On the possibility of research the photon-photon interaction at the European X-ray Free Electron Laser – European XFEL
Authors: Popov A N , Bobashev S V , Bezverkhnii N O , Sorokin A A 
Published: December 2019

Abstract
The possibility of performing the experimental research in the field of fundamental physics based on the unique instrument – European X-ray Free Electron Laser (E-XFEL) is considered in this paper. The calculations of the reaction γ + γ → e+ + e−
cross section for gamma quanta with E ∼ (1 − 100) GeV energy with X-ray photons are performed. The possibility of experimental registration of reaction γ + γ → e+ + e−
product are reviewed. Also, the optical depth of the interaction between gamma-rays with the E-XFEL’s photon pulses is estimated. Astrophysical applications are discussed.
Classification of gamma-ray bursts observed with Konus-Wind
Authors: Svinkin D S , Aptekar R L , Golenetskii S V , Frederiks D D , Ulanov M V , Tsvetkova A E 
Published: December 2019

Abstract
We present the analysis of duration and spectral-hardness distributions of ∼ 3000 gamma-ray bursts (GRBs) detected by Konus-Wind (KW) between November 1994 and early February 2019. We analyse burst T
50 and T
90 durations (the time intervals which contain the central 50% to 90% of the total burst count fluence, respectively) and argue that T
50 is more robust duration measure than T
90. Using a two log-normal component fit to the T
50 distribution we pick the boundary between the overlapping classes of short-duration and long-duration bursts to be at T
50 = 0.7 s, which implies the fraction of short GRBs (T
50
< 0.7 s) to be ∼ 17%. Using Gaussian mixture model fits we show that hardness-duration distribution can be well described by three Gaussian components, with two components corresponding to short/hard and long/soft GRB population, and the third component covering the softest GRBs with intermediate durations. This classification suggests that ∼ 14% KW GRBs are from short/hard population.
Finally we discuss a possibility to discriminate between physically distinct Type I and Type II GRBs with the help of hardness-duration distribution.
Detection of the PSR J1741+1351 white dwarf companion with the Gran Telescopio Canarias
Authors: Zyuzin D A , Kirichenko A Yu , Karpova A V , Shibanov Yu A , Zharikov S V , Fonseca E , Cabrera-Lavers A 
Published: December 2019

Abstract
We report detection of the binary companion to the millisecond pulsar J1741+1351 with the Gran Telescopio Canarias. The optical source position coincides with the pulsar coordinates and its magnitudes are g′ = 24.84(5), r′ = 24.38(4) and i′ = 24.17(4). Comparison of the data with the WD evolutionary models shows that the source can be a He-core WD with a temperature of ≈ 6000 K and a mass of ≈ 0.2M⊙. The latter is in excellent agreement with the companion mass obtained from the radio timing solution for PSR J1741+1351.
Glitches in neutron stars with magnetically decoupled core
Authors: Goglichidze O A , Barsukov D P 
Published: December 2019

Abstract
The magnetically decoupled core model was proposed earlier as a way to solve the problem of inconsistency between the neutron star long-period precession and superfluid vortex pinning which is the base of most theories of pulsar glitches. It was assumed that the pinning takes place in the region of the neutron star core which, being magnetically decoupled, can rotate relative to the crust. In present work some aspects of the glitch spin-up stage in the framework of the proposed model are discussed. Estimated spin-up time-scales are compared with observational data. According to the estimations the Crab pulsar is likely posses a magnetically decoupling core region, while the results for the Vela pulsar is more controversial.
Optical identification of binary system millisecond pulsar J1045−4509 with the VLT
Authors: Bobakov A V , Zyuzin D A , Shibanov Yu A 
Published: December 2019

Abstract
We analyse archival optical data on the binary companion to the millisecond pulsar J1045-4509 obtained with the Very Large Telescope. A possible optical counterpart candidate is found at the pulsar position. Its magnitudes are V > 26.4, R = 25.7(2) and I = 25.4(2). The data are compared with white dwarf evolutionary models. Depending on still poorly known distance to the pulsar, two alternative interpretations are possible. For the radio timing parallax distance, the candidate can be a very cool and old white dwarf with the hydrogen atmosphere and the temperature of < 3000 K and the age of > 5 Gyr. The dispersion measure distance suggests a younger (∼ 2 Gyr) and hotter (∼ 6000 K) white dwarf, whose atmosphere composition remains unknown.
Investigation of the asteroids Masaakikoyama (13553) and 5131 (1990 BG) during their close approaches to the Earth
Authors: Petrova S N , Devyatkin A V , Gorshanov D L , L’vov V N 
Published: December 2019

Abstract
Astrometric and photometric observations of two near-Earth asteroids having poorly-defined axial rotation periods – Masaakikoyama (13553) and 5131 (1990 BG) – were performed using two telescopes of the Pulkovo Observatory (CAO RAS). Both asteroids in question have proved to be very slow rotators with signs of tumbling. Using the data obtained their periods were derived (97.1 ± 0.2 and 157.82 ± 0.2 hours, respectively), dense lightcurves were obtained. Accuracy of the orbital elements of the asteroids was also improved.
Radiocarbon data from the Most Ancient Dryas to the Younger Dryas: cosmic rays and climate
Authors: Kudryavtsev I V , Dergachev V A 
Published: December 2019

Abstract
In the present work we consider the abundance of radiocarbon (Δ14C) in the Earth’s atmosphere in 12000-8500 BC years. Some periods of sharp cold and warming are fixed in this time interval. The so-called Younger Dryas (≈ 10700–9700 BC) is one of the most well known examples of dramatic change of terrestrial climate. The Younger Dryas (≈ 10700–9700 BC) lasted for ca one thousand years and a transition from the Last Glaciation to the interglacial Holocene has happened about 12 thousand years ago. During the Younger Dryas the amount of Δ14C increased within ≈ 10800 –10560 BC by 3% and it decreased by 6 % over a period 10560-9680BC. The reconstructions of the radiocarbon production rate and the heliospheric modulation potential based on 14C and 18O data sets are presents. The periods of extreme levels of these parameters are determined.
Boron Isotopes in the PAMELA Experiment
Authors: Bogomolov E A , Vasilyev G I 
Published: December 2019

Abstract
Analysis of the isotopic composition of nuclei in galactic cosmic rays (GCR) in the PAMELA orbital international experiment allows us to study the problems of the origin and propagation of cosmic rays in the Galaxy. Due to the high statistical and methodical accuracy, the PAMELA magnetic spectrometer data provided significant progress in the study of the isotopic composition of the light nuclei from H to Be in the GCR in the energy region of ∼0.1–1 GeV/nucleon and, for the first time, made it possible to estimate the contribution in GCR from local (∼100 pc) recent (∼106 years) interstellar sources (LS) from supernova explosions. An isotopic analysis of boron (B) nuclei in the GCR has so far been carried out only in the energy region ∼0.08–0.17 GeV/nucleon in the space experiments Voyager, Ulysses, ACE. In this work using the PAMELA data 2006-2014 about the rigidities of the detected nuclei and their speed (time of flight analysis (TOF) and ionization losses in a multilayer calorimeter) for the first time was made an attempt to determine the 11B/10B ratio in the energy range of ∼0.1–1.0 GeV/nucleon. The new PAMELA data are consistent with existing measurements and those expected from modeling, but the statistical and methodological accuracy of measurements does not allow us to separate the contribution of local boron sources to GCR. The results of the isotope analysis of boron nuclei in the GCR (spectra 10B, 11B and 11B/10B ratio depending on the rigidity and energy of the nuclei) in comparison with the existing measurement data and calculations will be presented.
Estimates dark halo parameters in S-galaxies
Authors: Butenko M , Kuzmin N , Nichiporov I 
Published: December 2019

Abstract
The dark mass problem is the most important for cosmology and galaxies physics. Various observational data of galaxies and galaxies clusters kinematics and dynamics require presence of massive dark matter. We estimate the dark mass within the galaxies optical radius using several different approaches, such as the maximum disk model, the marginal condition of the stellar disk gravitational stability and the vertical equilibrium condition in the galactic disk. The distribution functions of the relative dark mass within the optical radius Ropt
for a set of 50 galaxies are constructed. Most of the objects from our set have a relative mass within µ = 2. This agrees well with the results of numerical simulations.
Gravitational lensing probability for the Konus-Wind gamma-ray bursts detected in the triggered mode
Authors: Tsvetkova A E , Svinkin D S , Frederiks D D 
Published: December 2019

Abstract
Although half a century has passed since the discovery of Gamma-ray bursts (GRBs), there is no evidence for any strongly lensed event. Using GRB luminosity function and GRB formation rate estimates for the Konus-Wind burst sample with known redshifts, and a Singular Isothermal Sphere as a gravitational lens model, we predict the detection rate of both GRB images being ≈ 0.02–0.05 events per year. The result is consistent with the non-detection of lensed bursts in the KW triggered GRB sample.
The multiparametric method of analyzing the lunar dynamic processes
Authors: Mubarakshina R R , Andreev A O , Nefedyev Y A , Borovskih V S , Churkin K O 
Published: December 2019

Abstract
The present paper focuses on studying the lunar dynamic processes. As selenophysics is a complex system and moonquakes are complex multi-parametric systems too, the analysis of moonquakes and the development of an analytical theory of such processes require the application of robust methods and using multiparametric calculations. Moreover, selenophysics is a more complex system than geophysics. In this connection, the study of lunar processes and determination of moonquakes parameters require reliable estimates of the results obtained and application of the methods of complex system physics. The observations from “Apollo” space mission were used in the study, and the multiparametric correlation method was developed for their processing. Currently, one uses various methods, similar to the ones for the Earth’s seismic process investigation, such as seismic interferometry for deep moonquakes, time scales analysis, seismic phenomena magnitude gradient change, solution of the inverse problem of signals reflection on “Apollo” stations. Now, on the basis of moonquakes data, the internal structure of the Moon is being studied. Using the moonquakes data, a model of the lunar tidal parameters had been developed and was later refined by “GRAIL” (gravitation), “LRO” (shape), and “LLR” (rotation) space missions’ data. As a result, in the areas where deep moonquakes occurred, the inner layer of the Moon with low viscosity was found. In the present work, the author’s method of analyzing moonquakes allowing to conduct multiparametric analysis of seismic time series observations was applied. The method was developed for the investigation of seismic processes occurring on the Earth using the space observations. In order to provide qualitative description of moonquakes dynamical parameters, the special software was developed.
Effect of sodium hypochlorite on nucleic acids of different primary and secondary structures
Authors: Osinnikova D N , Moroshkina E B , Mokronosova E S 
Published: December 2019

Abstract
The effect of sodium hypochlorite (NaClO) on nucleic acids (NAs) was investigated. The effect of biomolecular structure on resistance to hypochlorite was analysed: plasmid bacterial DNA, calf thymus DNA, synthetic polyadenylic-uridic acid samples were studied, as well as individual nucleotides (adenosine-5’-tetraphosphoric acid and guanosin-2’, 3-cyclophosphoric acid). The effect of sodium hypochlorite on DNA was investigated depending on the concentrations of the components. We have also performed detailed analysis of the kinetics of the reaction between the NAs and NaClO. It was found that both the destruction of the secondary structure of DNA (denaturation) and the chemical modification of nitrogenous bases, presumably chlorination, occur. Presence of a stable double-stranded structure of DNA slows down the chemical reaction of sodium hypochlorite with nitrogenous bases of DNA.
Study on the processes of nitrogen adsorption and capillary condensation in the powders of calcium hydroxyapatite
Authors: Khalugarova K. N. , Maraeva E. V. , Moshnikov V. A. 
Published: December 2019

Abstract
This work is devoted to the study of mesoporous structure parameters of calcium hydroxyapatite powders on the basis of data obtained by nitrogen thermal desorption method. The isotherms of nitrogen desorption/adsorption on the samples of hydroxyapatite and the changes in their porous structure parameters depending on the temperature of the heat treatment are discussed.
Detection and image processing after nucleic acid amplification in emulsion
Authors: Tupik A , Novikov L , Evstrapov A 
Published: December 2019

Abstract
To analyze the results of amplification in the emulsion, special software package was developed. It was used to process images of emulsions, in which digital loop mediated isothermal amplification (LAMP) was carried out. Program units made it possible to combine a set of images of a reaction chamber into a single image file, count the number of droplets in chamber, and obtain histograms of the size distribution and fluorescence intensity of the droplets. The data obtained are necessary at the stage of equipment development for the selection of design parameters and for improving of the experiment methodology.
Microfluidic device for hydroxyapatite crystals growth process study
Authors: Rusanov V S , Afonicheva P K , Koryakina I G , Evstrapov A A 
Published: December 2019

Abstract
Heart problems tend to occupy a leading position among elderly diseases. Organ-on-a-chip is suitable technology for researches of human body mechanisms without animal models. One of the widely spread diseases is valve calcification. To study growth of hydroxyapatite crystals a microfluidic device was created. For simulating the heart valve on microfluidic device COMSOL Multiphysics® was used. The device was fabricated from polydimethylsiloxan using spin-coating method for membrane which acts as a valve and soft lithography for the other parts.
Mathematical model of epileptic discharge propagation
Authors: Kozeletskaya M G , Chizhov A V 
Published: December 2019

Abstract
Mathematical modelling of epileptic activity of a nervous tissue is an open problem. The previously developed biophysical model Epileptor-2 which describes the excitability of the neural network and the ionic dynamics reproduces ictal (convulsive) and interictal (usually pre-convulsive) discharges as a spatially homogeneous activity. To describe the spatial propagation of the discharges across the cerebral cortex a generalization of the model is proposed, based on an elliptical equation that takes into account the propagation of neuronal impulses via axodendritic trees. Simulated spatio-temporal patterns of extracellular potassium concentration as of the main characteristic of spatial excitability reflect the wave-like nature of the discharge propagation and are comparable with experimental observations. The propagation of neural impulses via axo-dendritic trees may play the main role in the mechanism of propagation of ictal discharges.
Application of ultrasound thermometry technique in case of local HIFU heating of test-object
Authors: Ivanova Y F , Yukhnev A D , Gataulin Y A , Smirnov E M , Tarkhov D A , Berkovich A E 
Published: December 2019

Abstract
The present work is aimed at development of a method for estimation of the accuracy of ultrasound thermometry (UST) when applying during local HIFU heating of a tissue-mimicking material (TMM). The method is based on comparison of the ultrasound measurement results with a temperature field reconstructed inside the TMM using data of the infrared (IR) camera surface measurements. In the case presented, the HIFU transducer heated up the TMM by 30 °C for 10 s in the focus area. Ultrasound signals were processed using an in-house UST application software. A 3D temperature field inside the TMM was reconstructed using a method based on the neural network approach. As a result, it has been achieved a good agreement between the UST measurement data and the reconstructed temperature field, especially for the points along the HIFU transducer axis.
Development of a multi-sensor analytical trainable system for non-invasive evaluation of adaptedness status of hazardous occupation specialists
Authors: Zaitseva A Yu , Kislyakova L P , Kislyakov Yu Ya , Avduchenko S A 
Published: December 2019

Abstract
Several studies have been conducted in order to develop a new method of non-invasive diagnostics of performance ability of hazardous occupation specialists in terms of the exhaled air condensate parameters with the use of an artificial multi-sensor trainable diagnostic system. The method is based on applying an array of poly-selective electrochemical sensors with cross sensitivity to main physiologically important components of a subject medium. Training of the system was implemented according to the principle of grouping test persons using mathematical methods of data processing and correlation with real adaptedness level data obtained during medical and biological examinations. After having been trained, the analytical system enabled subsequent recognition of the “image” of a testee and assigning them to an adaptedness level group. The results obtained prove feasibility of the new multi-sensor trainable complex, its suitability for adaptedness status evaluation of hazardous occupation specialists.
Amplification of the propagating plasmon in a periodical structure with an active graphene
Authors: Moiseenko I M , Mashinsky K V , Popov V V , Fateev D V 
Published: December 2019

Abstract
The amplification of the unidirectionally propagating plasmon modes excited by the incident terahertz wave in a periodical structure with an active graphene is studied theoretically. The effective excitation of propagating plasmon mode occurs due to the simultaneous excitation of “radiative” and “nonradiative” plasmon modes at the same frequency. The amplification of propagating plasmon modes is due to radiative recombination in inverted graphene.
Features of the construction of the noise compensation circuit of a small-sized active phased antenna array
Authors: Moroz A V , Davydov V V , Malanin K Yu , Krasnov A A , Rud’ V Yu 
Published: December 2019

Abstract
In an article the influence of active and passive interferences on the operation of X-band radar are considered. A new way to compensate for this interference is proposed. To implement this method, a new interference compensation unit based on horn antennas is developed. The experimental investigation results of unit work, as a separate device, and as part of the radar station are presented.
Anisotropic energy gap of low-frequency AFMR mode in FexGa1-xBO3 single crystals
Authors: Mogilenec Yu , Seleznyova K , Strugatsky M , Yagupov S , Drovosekov A , Kreines N , Kliava J 
Published: December 2019

Abstract
Diamagnetically diluted iron-gallium borate Fe
x
Ga
1-x
BO3 single crystals have been studied by Antiferromagnetic Resonance (AFMR) at 77 K in the frequency range of 17 to 25 GHz in magnetizing fields up to 10 kOe. Anisotropic energy gap of the low-frequency AFMR mode has been determined under the rotation of the magnetizing field in the basal plane of the crystals. The results show a reduction of the anisotropic energy gap with decreasing x.
Surface potential response from GaP nanowires synthesized with mixed crystal phases
Authors: Kyeyune B , Soboleva E , Geydt P , Khayrudinov V , Alekseev P , Lipsanen H , L¨ahderanta E 
Published: December 2019

Abstract
In this work, we investigate variations of surface potentials along a single gallium phosphide (GaP) nanowire (NW) synthesized with a mixed crystal phase along the growth direction. GaP NWs synthesized with both wurtzite (WZ) and zincblende (ZB) phases were studied. The measurements were performed on a standard Atomic Force Microscopy (AFM) set-up equipped with Kelvin Probe Force Microscopy (KPFM) module in PeakForce Tapping Mode. KPFM Measurements from two structures were analyzed. Variations of surface poten-tials were observed in a single GaP NW with WZ/ZB segments. An average difference in surface potential was 55±11 mV. This is explained by different crystal structures along the NW. The work expands the understanding of crystal structure-dependent electrical transport properties of GaP NWs.
Monte Carlo study of β-Ga2O3 conductivity
Authors: Abdrakhmanov V L , Konchenkov V I , Zav’yalov D V 
Published: December 2019

Abstract
Using semiclassical Monte Carlo simulations a conductivity of β-Ga2O3 is investigated considering a scattering of charge carriers on acoustical phonons, polar optical phonons and charged impurities. Modelling takes into account 12 IR active polar optical phonons modes. Dependence of mean collision frequency on energy of charge carriers is examined. The results are compared with the conclusions of other groups of researchers.