bluuebunny/crossref_metadata_2025_split huggingface dataset:
Genetic analysis of the meteor showers and asteroids
Authors: Sergienko M V , Sokolova M G , Andreev A O , Nefedyev Y A 
Published: December 2019

Abstract
Using the video catalogues of the Perseids, Ursids, and Lyrids meteor showers having genetic connections with comets, the Geminids, Alpha Capricorni, and Taurids having genetic connections with asteroids, and the Kappa Cygnids and Delta Cancrids of unknown origin, the objects with magnitude higher than +3 were studied. The analysis of coordinates of the meteor showers’ radiant distribution in relation to their magnitudes showed that the Lyrids has the smallest ellipse of the spread of the radiant positions, with 4° by 8°; for the k-Cygnids the deviation is the greatest, with 28° by 28°; for the other showers, it is between 7° and 10°. The main attention is paid to the determination of structural parameters of the Lyrids meteor shower.
Deep minima of the Sun’s activity according to data of solar paleoastrophysics
Authors: Ogurtsov M G 
Published: December 2019

AbstractTwenty paleoreconstructions of the Sun’s activity, obtained using the data on both cosmogenic isotopes and auroral records, are generalized over a time interval 1402-1850. Final reconstruction of sunspot number is obtained by means of normalization of the generalized record by the instrumentally measured seriesSN. Comparison of average levels of solar activity during the periods of solar minima of Spoerer (1415-1545), Maunder (1645-1715) and Daltona (1792-1827) is made. Discussion of the results is presented.
Microwave frequency standard on Hg-199 ions for space stations and vehicles
Authors: Lukashev N A , Davydov V V , Rud’ V Yu 
Published: December 2019

Abstract
In the paper the design of a magnetic trap for low mass-dimensional microwave frequency standards is presented. The dependencies between the number of registered photons by PMT and magnetic field values are established. The new algorithm for optical processing is developed. For different designs of microwave standard on 199Hg+ ions the results comparison of experimental Allan deviation researches is performed.
Fluorescent labeling of bacteriophage T7 by CRISPR-Cas9
Authors: Znobishcheva E A , Morozova N E , Khodorkovskii M A 
Published: December 2019

Abstract
The objective of this work was to develop a simple method for coupling a fluorescent protein with a bacteriophage capsid. The Escherichia coli bacteriophage T7 was chosen as a model one. The method, based on CRISPR-Cas9 system and the λ-Red recombination, allowed to insert the gene of enhanced yellow fluorescent protein into the phage genome.
Study of the dependence of the structural defects and bulk inhomogeneities of nanocrystalline hydroxyapatite on the conditions of production using a biological source of calcium
Authors: Goloshchapov D L , Savchenko D V , Kashkarov V M , Khmelevskiy N O , Aksenenko A Yu , Seredin P V 
Published: December 2019

Abstract
The study of structural and bulk defects in nanocrystalline samples of hydroxyapatite with a developed surface was carried out. The XRD method established distortions in the crystal lattice of the synthesized samples of hydroxyapatite (HAP), which are associated with the inclusion of impurity atoms present in the eggshell of birds used as a biological source of calcium. The presence of impurity atoms of magnesium, sodium, and fluorine in the obtained materials was determined by X-ray photoelectron spectroscopy. Applying ESR and Raman spectroscopy it was found the presence of CO3 complex in the structure. Studies of the morphological organization of the samples found a large number of surface defects – nanopores – in crystalline HAP. At the same time, the size of these 3D defects depends on the conditions of preparation and is determined by the content of phosphate groups in the initial solution.
Epileptic seizures regularities, revealed from encephalograms time series by nonlinear mechanics methods
Authors: Hilarov V L 
Published: December 2019

Abstract
Recurrence quantification analysis and multifractal method were used for investigation of the encephalograms time series of the children with epileptic seizures. It has been shown that epileptic seizures are accompanied by an increase in determinism of the brain electric process due to neuron activity synchronization. This behavior is typical for nonlinear systems catastrophes of different nature
Magnetic beads-based nucleic acids extraction in microfluidic chip
Authors: Afonicheva P K , Esikova N A , Tupik A N , Evstrapov A A 
Published: December 2019

Abstract
The dominant trend in molecular genetic methods research of biological samples is the automation of all stages, the most valuable of which is preparation of the sample. The use of microfluidic technologies provides not only full control of all operations at this stage, but also reduces the impact of the environment on the sample preparation process. Magnetic beads technology is one of the methods for extracting RNA and DNA with subsequent analysis. The paper presents magnetic beads-based nucleic acids extraction in the microfluidic chip via automatic mode with further registration by real-time polymerase chain reaction. We have shown that efficiency of DNA extraction in microchip is compared to that in case of conventional manual extraction and allows further improvement by means of automation.
Interaction of thermally evaporated dipeptides with keV-energy α-particles
Authors: Basalaev A A , Buzykin A G , Kuz’michev V V , Panov M N , Smirnov O V 
Published: December 2019

Abstract
Fragmentation of isolated molecular ions of dipeptides produced by alpha-particles was studied by an experimental technique based on time-of-flight analysis of the charge and mass composition of the fragment ions. The study has shown that the N-Glycylglycine sublimation results in the molecule decomposition into cyclo(GlycylGlycyl) and H2O molecule. We have examined a mass-spectrum of the fragments arising in the cyclo(GlycylGlycyl) interaction with α-particles. By analyzing the temperature dependence of the cyclo(GlycylGlycyl) vapor pressure, we have determined sublimation enthalpy ΔHsubl(453K) = (213 ± 9) kJ/mol.
In vivo optical clearing of human skin under the effect of aqueous solutions of some monosaccharides
Authors: Berezin K V , Dvoretsky K N , Chernavina M L , Nechaev V V , Likhter A M , Shagautdinova I T , Antonova E M , Tuchin V V 
Published: December 2019

Abstract
The results of in vivo optical immersion clearing of human skin under the effect of aqueous solutions of some immersion agents (monosaccharides of ribose, glucose and fructose, as well as glycerol, a triatomic alcohol) were obtained with the use of the OCT method. Values of average velocity of scattering coefficient change, obtained through an averaged A-scan of the OCT signal in the region of derma with the depth of 350 to 700 µm, were determined to evaluate the optical clearing efficiency. The velocity of scattering coefficient change and the optical clearing potential value appeared to be well correlated. The complex molecular modeling of a number of immersion clearing agents with a mimetic peptide of collagen (GPH)3, carried out with the use of the methods of classical molecular dynamics and quantum chemistry, allowed to identify correlations between the optical clearing efficiency and the energy of intermolecular interaction of clearing agents with a collagen peptide fragment.
Regulation of type II restriction-modification system Esp1396I
Authors: Antonova D A , Morozova N E , Shiryaeva A A , Khodorkovskii M A 
Published: December 2019

Abstract
Fluorescence microscopy is a powerful tool which enables to observe a large number of processes at the level of single cells. A protein of interest could be selectively labeled using fluorescent proteins, thereby allowing direct observation of its accumulation in living cells. This work is devoted to study a restriction-modification system which is a protective system of bacteria against foreign DNA. The action of such a system is based on DNA degradation by an enzyme — restriction endonuclease — and is strongly regulated to prevent host cell DNA damaging. In current study, the restriction-modification system contains controller protein, which regulates amount of restriction-modification system enzymes. Changes in amount of restriction-modification system proteins may cause a change in protection level of bacteria against viruses. We use fluorescence microscopy for direct observation of restriction-modification protein levels and their changes depending on the amount of controller protein in bacterial cells.
Multi-resonance cyclotron-undulator electron acceleration
Authors: Oparina Yu S , Savilov A V , Bandurkin I V 
Published: December 2019

Abstract
In this work, we propose a method of particle acceleration by the electromagnetic wave pulse propagating in the waveguide. The method is based on a “superposition” the electron cyclotron oscillations in the uniform longitudinal magnetic field and their bounce-oscillations in the periodical transverse magnetic field (undulator). Correspondingly, two mechanisms of the electron accelerations by the wave are provided simultaneously, namely, the well-known cyclotron acceleration and the undulator acceleration in the regime of the inversed free-electron laser. The multi-resonance character of this system leads to a chaotic behaviour of the electron motion in the field of the wave. In the process of this motion, electrons can get a very high energy (as compared to the case of the purely cyclotron acceleration by the same wave pulse.
Frequency modulation, amplification and compression of microwave pulses in a system with helically corrugated waveguides as a dispersive elements
Authors: Yurovskiy L A , Ginzburg N S , Zotova I V , Vilkov M N , Samsonov S V , Sergeev A S 
Published: December 2019

Abstract
We consider the possible implementations of the Chirped Pulse Amplification (CPA) technique widely used in optics for the microwave frequency band. We propose using helically-corrugated waveguides for pulse stretching and compressing as their dispersion properties strongly depend on geometrical parameters. For stretched pulse amplification, a helical-waveguide gyro-TWT can be used as a broadband amplifier. Simulations with parameters of the experimentally realized 30 GHz gyro-TWT show that for a 300 W, 200 ps incident pulse, amplification up to 6 MW can be achieved in this system, while in the linear regime of the same gyro-TWT the output power is only about 250 kW.
Spontaneous coherent cyclotron emission from photo-injector electron bunches: superradiation and two-frequency regime
Authors: Oparina Yu S , Pershin D S 
Published: December 2019

AbstractShort dense electron bunches are attractive from the viewpoint to use them for the implementation of powerful and compact radiation source based on the spontaneous mechanism of radiation. The regime of spontaneous radiation is realized, when the bunch phase size is smaller than 2π. Modern photo-injectors insure formation of mildly relativistic dense electron bunches with duration less than 1 ps. Such bunches are “ready” to radiate waves at terahertz frequencies in the spontaneous regime. However, the repulsion of particles caused by a strong Coulomb field inside the dense electron bunch strictly limits the duration of the radiation process due to the increase in the bunch length. We propose two mechanism of cyclotron radiation to solve this problem. The first one is the regime of group synchronism of particles with the radiated wave; in this case compensation of Coulomb repulsion in the phase space takes place. The second proposed solution is to use compression of bunch by radiated electromagnetic fields.
Precision silicon doping with acceptors by temperature gradient zone melting
Authors: Seredin B M , Kuznetsov V V , Lomov A A , Zaichenko A N , Martyushov S Yu 
Published: December 2019

Abstract
We present the results of optimization of the temperature gradient zone melting technique, also known as the thermomigration (ThM) technique, aimed on improvement of the quality of p-layers and formation of p-n junctions with sharper boundaries compared to those obtained by conventional thermal diffusion technique. In addition, ThM allows an expansion of the range of doping of silicon substrates with an acceptor impurity, usually limited by the solidus value. The ternary Al-Ga-Si and Al-Sn-Si melts were used as ligatures. The dependences of the migration rate of the liquid zones on temperature and composition for the Al-Ga and Al-Sn solvent metal are presented. The possibility of changing the acceptor concentration from 2·1019 cm−3 to 6·1019 cm−3 is shown. A threshold temperature of 1400 K was experimentally found for the ThM process with stable migration of triple liquid zones in a crystal. X-ray diffractional rocking curves and projection topography confirmed high structural quality of the Si(Al) p-layer with a thickness of 25 µm, obtained by ThM with stable moving liquid zones. The experimentally measured strain Δd/d=2.3×10−5 for the p-layer and the silicon substrate was used in the substitution model to estimate the Al concentration of 1×1019 cm−3. X-ray topographic images of the layers did not reveal both growth S-defects and misfit dislocations, confirming the high structural perfection of the layers and phase boundaries.
Features of the 1640 cm−1 band in the Raman spectra of radiation-damaged and nano-sized diamonds
Authors: Khomich A A , Averin A A , Poklonskaya O N , Bokova-Sirosh S N , Dzeraviaha A N , Khmelnitsky R A , Vlasov I I , Shenderova O , Poklonski N A , Khomich A V 
Published: December 2019

Abstract
Raman spectra of irradiated with fast neutrons or MeV ion-implanted radiation-damaged natural and CVD diamonds and chemically purified detonation nanodiamonds are investigated. The influence of radiation damage level and effects of high-temperature annealing on the intensity and spectral shape of the 1640 cm−1 band is studied. It is shown that in radiation-damaged diamonds this band consists of at least six Gaussian peaks, the intensity of which varies one to one both with the level of radiation disordering and the temperature of the subsequent annealing. The “1640” band in radiation-damaged diamonds is completely annealed at temperatures above 1000 °C, while in detonation nanodiamonds annealing up to 1200 °C does not significantly affect its shape and intensity.
The one-dimensional model of non-Newtonian hemodynamics
Authors: Verigina M A , Krivovichev G V 
Published: December 2019

Abstract
The one-dimensional model of the blood flow in large vessels is considered. The non-Newtonian nature of blood is modeled by the friction force and Boussinesq coefficient value. The power law rheological model of fluid is used. The comparison with the models of blood as ideal and Newtonian fluid is realized. The nonlinear problems of single-pulse propagation in a single vessel and in a vessel with bifurcation are considered. It is demonstrated, that non-Newtonian effects play an important role in the obtained solutions.
Application of the random matrix theory to the boson peak in glasses
Authors: Conyuh D A , Beltukov Y M , Parshin D A 
Published: December 2019

Abstract
The density of vibrational states g(ω) of an amorphous system is studied by using the random-matrix theory. Taking into account the most important correlations between elements of the random matrix of the system, equations for the density of vibrational states g(ω) are obtained. The analysis of these equations shows that in the low-frequency region the vibrational density of states has the Debye behavior g(ω) ∼ ω2. In the higher frequency region, there is the boson peak as an additional contribution to the density of states. The obtained equations are in a good agreement with the numerical results and allow us to find an exact shape of the boson peak.
Summation of divergent field-theoretical series for exact and variable values of asymptotic parameters: numerical estimates for the ground-state energy of a cubic anharmonic oscillator
Authors: Varnashev K B 
Published: December 2019

Abstract
Using, as an example, the calculation of the ground-state energy of a cubic anharmonic oscillator, we demonstrate a new approach to summation of divergent series. Our approach based on the Borel-Leroy transformation in combination with a conformal mapping does not require the knowledge of exact values of asymptotic parameters that determine the large-order behaviour of the series. Resumming field-theoretical expansions by varying the asymptotic parameters in a wide range of their exact values, we postulate the independence of the result of numerical analysis from the asymptotic parameters and based on this criterion we give a numerical estimate of the ground state energy of the cubic anharmonic oscillator for different values of the parameters of expantion and anisotropy, taking into account various orders of perturbation theory. We demonstrate good agreement between the results of our numerical calculations and the estimates obtained in the framework of the resummation technique using exact values of the asymptotic parameters. The results we achieved for the simplest anisotropic model allow us to apply this approach to investigate more complicated field-theoretical models describing real phase transitions in condensed matter physics or elementary particle theory, where the perturbation theory used has no small parameter of expansion and the exact values of the asymptotic parameters of the model are unknown.
Wave-mechanical phenomena in optical coupled-mode structures
Authors: Zloshchastiev Konstantin G. 
Published: December 2019

Abstract
We derive a formal mapping between Schrödinger equations and certain classes of Maxwell equations describing the classical electromagnetic wave’s propagation inside coupled-modes waveguides. This mapping reveals a phenomenon, which is not visible in the original form of Maxwell equations: multiple solutions occur which satisfy same boundary conditions but correspond to different eigenvalues of a certain operator; the latter is analogous to Hamiltonian operators which occur in quantum systems. If one deals with normalized state vectors then a proper analogy with the conventional wave mechanics is established: solutions form a Hilbert space which is somewhat similar to that in the quantum mechanics. Therefore, coupled-mode configurations should possess certain wave-mechanical features, which can be formally studied using a formalism of quantum mechanics or, at least, its mathematical part. We notice also that the occurring Hamiltonian operators always possess a skew-adjoint part if one deals with normalized state vectors – even if permittivity and permeability are real-valued. This leads to the “dressing” effect of propagation constants, which indicates presence of additional gain or loss processes in the coupled-mode systems.
Intermittent particle transport with arbitrary distributions of duration of motional phases
Authors: Rukolaine Sergey 
Published: December 2019

Abstract
Intermittent transport of biological objects, including ballistic and Brownian motion, Brownian motion with drift, occurs universally in various forms and scales. In many instances models of intermittent transport imply that the distribution of duration of motional phases is exponential. However, this is by no means always the case. In this paper we generalize the model of intermittent transport, proposed in Bressloff P C and Newby J M 2013 Rev. Mod. Phys.
85 135–196, to the general case of arbitrary distributions of duration of motional phases. We derive also an asymptotic approximation to the model in the assumption that transitions between the phases are frequent.
The structure of the screening layer near the cylindrical bodies emitting charged particles in a deep vacuum
Authors: Gunko Yu F , Gunko N A 
Published: December 2019

Abstract
The purpose of this paper is the exploration of the electric field structure near cylinrical bodies. The solution of the problem is reduced to solving the equation for the potencial of a self-consistent electric field written in dimensionless form.
The behavior of the potential is found by the combined method (at the initial stage, analytically, and then numerically). In contrast to the works devoted to this subject, the dependence of the potential on the coordinates is determined at various values of the electric field strength on the surface of the bodies, which is considered as a parameter.
Such an approach made it possible to distinguish different regimes of electron flows motion: motion in an accelerating field, motion in a field with a minimum of the potential, and returned flow. Determining the position of the boundary between the second and third regimes made it possible to find the thickness of the shielding layer near isolated cylindrical bodies under conditions of deep vacuum.
Knowledge of the potential and magnitude of the screening layer have a practical value: for radio communications, for the smooth operation of electronic equipment on artificial celestial bodies, for studying the mechanisms of lunar soil erosion caused by electric fields, for studying the behavior of potential in complex dusty crystalline structures, as well as for constructing cylindrical diodes working in a given mode.
Analytical solutions of the problems for equations of one-dimensional hemodynamics
Authors: Tkachenko P S , Krivovichev G V 
Published: December 2019

Abstract
The paper is devoted to the construction of an analytical solution of the initial problem for the one-dimensional system of equations of non-Newtonian hemodynamics. In the model, the blood is considered as the power-law fluid. The perturbation method for the solution is proposed. The cases of the first and second perturbations are considered. The obtained solutions can be used for the comparison of different rheological models of blood or for the testing of programs, which realize the numerical algorithms.
Modification of Godunov method for calculations of discontinuous two-temperature flows of low-temperature rare gas plasma
Authors: Kurakin Yu A 
Published: December 2019

Abstract
The paper presents the implementation of Godunov method for shocked flows of two-temperature rare gas plasma. An algorithm for cell edge convective fluxes calculation was developed. Algorithm is based on the solution of Riemann problem in rare gas plasma and includes accurate consideration of electrons adiabatic expansion. The theory uses the assumption that ionization and electrons-molecules collisional heat exchange rates are compatible with the characteristic time of the flow and can be neglected in Riemann problem solution.
Application of hyper-chaotic Lorenz system for data transmission
Authors: Kondrashov A V , Grebnev M S , Ustinov A B , Perepelovskii V V 
Published: December 2019

Abstract
A novel method of digital data transmission is developed and experimentally investigated. The main idea of the method is to convert digital data into a chaotic spectrum, mix it with a background signal and transmit to receiver using TCP/IP protocol. The hyper-chaotic Lorenz system of differential equations is used as a source for carriers of the chaotic spectrum. Chaotic synchronization is not used in the method, that allows to improve stability of data transmission. Human voice is used as the background signal. Therefore, the method allows one to use single communication channel for transmission of different signals without losses. Numerical investigations approved that the chaotic signal transformation does not change chaotic nature of the Lorenz system. Thus, developed method demonstrates high privacy level.