bluuebunny/crossref_metadata_2025_split huggingface dataset:
The generalization of shift operator related Bessel differential operator
Authors: Britvina L E , Ignatenko V V 
Published: November 2019

Abstract
We introduce the generalized shift operator related to the Bessel differential operator and the Hankel integral transform. It generalizes the operator introduced by J Delsarte and studied by J. Delsarte, B.M. Levitan and Ya.I. Zhitomirskii. The considered operator is not the generalized shift operator of the Levitan’s type. The basic properties of the shift operator are proved. The visualization of shift action is given.
Pseudorandom amplitude-phase-shift keyed signals with irregular bi-level amplitude spectrum for moving target detection
Authors: Bystrov N E , Zhukova I N , Chebotarev S D 
Published: November 2019

Abstract
This paper considers the target locating against the clutter background in radars with quasi-continuous mode of transmission and reception on common aerial of signals with pseudorandom amplitude- and phase-shift keying. Pseudorandom amplitude-phase-shift keyed signals with irregular bi-level amplitude spectrum are proposed for use. The high-level spectrum components of returns from the moving and stationary targets can be partially overlapped. It is proposed to perform the frequency rejection of high-level components of the stationary targets before the correlation signal processing. As a result, significant part of the energy of interfering reflections is cut out and just a small part of the energy of the useful signal is lost. The signal-to-clutter ratio increases. The synthesis method of pseudorandom amplitude-phase-shift keyed signal with irregular bi-level amplitude spectrum is considered. The spectrum of the synthesized signals is analyzed. Increase of the signal-to-clutter ratio was obtained in the processing of signals with frequency interference rejection. The result of detection modeling of a moving target against the background of reflections from a stationary object is presented.
What is reverse debugging? Classification of reverse debugging methods
Authors: Dmitriev D S , Dovgalyuk P M , Makarov V A 
Published: November 2019

Abstract
The article discusses an approach to speeding up the search complex errors in software – reverse debugging. In this approach, debugging is divided into two phase. The first phase is to save the behaviour to a log file. The second phase is the reproduction of behaviour and the search for errors. During the second phase, both past and future program states can be examined. The article describes methods that support this approach and general principles for such methods and their differences. A classification of reverse debugging methods is proposed by debugging scope and replay scope. Examples of modern reverse debugging tools and their place in the proposed classification are given.
About the values of generating polynomials of cyclotomic classes
Authors: Edemskiy V A , Tsurina A S 
Published: November 2019

Abstract
The trace representation of sequences is a powerful tool for the analysis and for the design of pseudorandom sequences. Z. Dai et al. (2011) reduce the problem of determining trace representation of series of binary eth power residue sequences to that of determining the values of generating polynomials of cyclotomic classes. We derive the values of generating polynomials of cyclotomic classes of order 4, 6, 8 and consequently solve three problems pointed by Z. Dai et al. In fact, we study the discrete Fourier transform of cyclotomic sequences of order 4, 6, 8.
Synthesis of the streaming network with optimal adjustment placement of different-sized radio elements on the surface of the construct
Authors: Elkanova L M , Baichorova A N , Botasheva F Iu 
Published: November 2019

Abstract
Streaming networks have a wide range of options for practical application: information flows in information and communications networks, transport traffic, electrical power systems. The tasks of large dimension, including those which are associated with finding the frequency-optimum traffic, should be solved by the decomposition method. The paper considers the algorithm of the “pinwheel” decomposition of the installation and switching space and synthesis of the streaming network with optimal adjustment placement of different-sized radio elements on the surface of the construct.
The heat conduction model involving two temperatures on the segment with Wentzell boundary conditions
Authors: Goncharov N S , Sviridyuk G A 
Published: November 2019

Abstract
According to the theory of relatively p-bounded operators, we study the Heat Conduction model involving two temperatures for isotropic material, which describes, the rate of change of internal energy due to the movement of the heat flux form one medium to its complement with general Wentzell boundary conditions. In particular, we consider spectrum of one-dimensional Laplace operator on the segment [0,1] with general Wentzell boundary conditions. We examine the relative spectrum in one-dimensional Heat Conduction equation involving two temperatures, and construct the resolving group in the Cauchy-Wentzell problem with general Wentzell boundary conditions. In the paper, these problems are solved under the assumption that the initial space is a contraction of the space L
2(0,1).
Additive-multiplicative fixed-pattern noise model of an IR photodetector, taking into account the exposure time
Authors: Kornyshev N P , Senin A S 
Published: November 2019

Abstract
The article discusses the additive-multiplicative fixed-pattern noise model of the infrared photodetector and a new way of its compensation, invariant to a change in exposure time. Examples of images showing the effectiveness of a new method for compensating fixed-pattern noise when the exposure time of a photodetector is changed are given.
Measuring blood flow velocity with a magnetic label
Authors: Lobekin V N , Leontiev V S , Petrov R V , Bichurin M I , Rebinok A V , Sulimanov R A 
Published: November 2019

Abstract
The article describes the method of measuring blood flow velocity by a non-invasive method of magnetizing blood with a magnetic pulse and detecting a magnetized substance using a magnetoelectric magnetic field sensor. The influence of the magnetic field on the parameters of blood and blood flow is considered. The methods of measuring blood flow velocity are considered, the distinguishing features of each method are given. The use of a magnetoelectric composite structure of bidomain lithium niobate\nickel\metglas is proposed as a sensitive element for detecting blood flow velocity.
Electronic structure of stishovite SiO2
Authors: Manyakin M D , Kurganskii S I 
Published: November 2019

Abstract
Electronic structure calculation of the stishovite as close packing SiO2 modification was performed with the use of the linearized augmented plane wave method in framework of Wien2k code. Band diagram, total and partial density of states were calculated. X-ray emission Si K and Si L2,3 spectra characterizing valence band were obtained. By “core hole” approximation XANES Si L2,3 was calculated. X-ray stishovite spectra reveals good agreement with the experimental data. The explanations are given for the observed density of states and emission spectra fine structure features.
Pseudo-random sequences with nonmaximal length based on the shift register and reducible polynomial
Authors: Pesoshin V A , Kuznetsov V M , Rakhmatullin A K 
Published: November 2019

Abstract
We consider nonhomogeneous pseudorandom sequences of nonmaximal length formed by a shift register with linear feedback (Fibonacci generators), and with internal half-adders (Galois generators). As a basis, we consider characteristic polynomial raised to the power of n of a form

φ

(
x
)

=

φ
0

m

(
x
)

φ
1

(
x
)

, where φ0 (x) and φ1 (x) are primitive polynomials respectively raised to the power of m
1 and m
1, m
0 · m + m
1 = n. We discovered periodic polynomial structures. Examples demonstrate a diversity of generated practical sequences, which are organized and ordered from elements of direct and inverse M-sequences. We investigated probabilistic properties of the formed sequences.
The identifying hidden data features problem solution
Authors: Petrova S Y , Boikova M A 
Published: November 2019

Abstract
In the article, we considered recommender models based on matrix factorization demonstrate excellent performance in collaborative filtering. The standard Matrix Factorization approach in MLlib deals with clear ratings. To work with implicit data, we used the trainImplicit method. To simulate the processing of real-time data streams, we used the Spark Streaming library, which is responsible for receiving data from the input source and converting the raw data into a discretized stream discretized stream (DStream) consisting of Spark RDD. The rank parameter determines the number of hidden features in the low rank approximation matrices. As a rule, the greater the number of factors, the better, but for a large number of users or elements, it will directly affect the memory usage of the computing system and the amount of data required for training. Therefore, in our problem it was a compromise solution.
A discerning algorithm for authorization
Authors: Petrova S Y , Eminov S I 
Published: November 2019

Abstract
In the article, we consider a discerning authorization algorithm that eliminates the contradictions in the assignment of access rights to security principals in complex infrastructures, which are using concepts such as group and inheritance. It also can use for the identification of security risks and it ensures that the security risk assessments produce consistent, valid and comparable results.
The rotation of methane molecules in the crystalline state above and below the temperature of the phase α-β transition
Authors: Prokhorov A Yu , Leont’eva A V , Dmitriev Yu A 
Published: November 2019

Abstract
The work is devoted to the study of rotational features of methane molecules in the methane solid state in different temperature ranges. We formulated earlier, the concept of the description of collective rotational motion of the CH
4 molecules with the use of a topon quasi-particle. This approach received a new experimental confirmation in papers by Yu. A. Dmitriev and N. P. Benetis on studying by electron paramagnetic resonance (EPR) quantum mechanical rotation of CH
3 radicals matrix isolated in solid methane and in a work by P. Pyykko using nuclear magnetic resonance (NMR) technique to test rotation of host molecules in methane at temperatures of orientational ordering (below the α−β transition). Comparison with the behavior of the CH
3 radical in other orientation-ordered matrices, CO
2, N
2, CO, N
2
O suggests that the observed change in the barrier at such low temperatures is associated with the reorientation of the methane matrix molecules, which, provided that their orientation ordering is preserved, is possible only as a result of collective tunnel rotation.
Modelling of microwave filters based on LTCC
Authors: Rychko A R , Telina I S , Petrov E V , Popov V V 
Published: November 2019

Abstract
Microwave filters made according to the technology of low-temperature co-fired ceramics (LTCC) are considered. The main features of LTCC technology are described. The parameters of the domestic glass-ceramic material are given. The stages of designing an integrated microwave filter, all elements of which are in the volume of ceramics, are considered. In the course of this work, a model of a LTCC microwave filter with a nominal frequency of 300 MHz was developed taking into account the parameters of domestic materials. According to the modeling outcomes, conclusions were made.
Size dependence of the melting temperature and mechanisms of the coalescence/sintering on the nanoscale
Authors: Samsonov V M , Alymov M I , Talyzin I V , Vasilyev S A 
Published: November 2019

Abstract
We have proposed to use the nanoparticle (NP) melting temperature Tm
to distinguish between the coalescence and sintering processes on the nanoscale. According to our molecular dynamics results, obtained on Au NPs, the coalescence of nanoproplets may be interpreted as a hydrodynamic phenomenon on the nanoscale, and the characteristic coalescence time τ is a linear function of the initial particle radius r
0. In turn, the sintering of two crystalline NPs (T < Tm
) relates to a grain boundary formation as a result of an alignment of the crystallographic orientations of the sintering NPs, and in this case a dependence of τ on r
0 has not been revealed.
On the mechanical stability conditions for nanoparticles in vacuum and under an external pressure
Authors: Sdobnyakov N Yu , Samsonov V M , Bazulev A N 
Published: November 2019

Abstract
A condition of the mechanical stability of non-volatile nanoparticles in a chemically inert medium is derived from the non-negativity of the second variation of the Helmholtz free energy of the ‘small object - gaseous medium’ system. Two cases have been analyzed: (i) a non-volatile nanoparticle with the surface tension depending on its radius; (ii) a limiting case of bigger objects when the surface tension corresponds to its constant macroscopic value. It has been shown that the external pressure should increase stability of nanoparticles. However, the effect under consideration should be noticeable at high pressures only.
Errors of the most popular functionals in the calculation of the electron energy and enthalpy of formation of compounds
Authors: Turovtsev V V , Orlov Yu D , Kaplunov I A , Fedina Yu A , Zubkov V V 
Published: November 2019

Abstract
The calculation of the total electron energy Etotal
and the enthalpy of formation

Δ
f

H

298

0

of the compounds GeO2, C2H6, NH2CHO, C6H6, C5H5N and C6H4O2 has been performed using methods B1LYP, B1PW91, B3LYP, BHandH, BHandHLYP, BLYP, BP, CAMY-B3LYP, HTBS, KMLYP, LCY-BLYP, LCY-BP86, LCY-PBE, LDA, M06, M06-2X, M06-HF, M06L, mPBE, mPW, MPW1K, MPW1PW, O3LYP, OLYP, OPBE, OPBE0, PBE, PBE0, PBEsol, PW91, revPBE, revTPSS, RPBE, TPSS, TPSSH, X3LYP and HF in the slater basis QZ4P, aug-TZ2P and TZ2P, as well as DZ, and the errors of calculation of Etotal
and Δ

Δ
f

H

298

0

at the variation limit were determined. The QZ4P basis set and the settings of the ADF program were configured so that these errors can be attributed to the structure of DFT functionals. The dependence of the Etotal
and

Δ
f

H

298

0

based on type (size) of the basis set was studied. It has been demonstrated that the functional M06 has the smallest error independent from the incomplete basis set, and the optimal combinations are DFT/TZ2P, where DFT = OPBE, X3LYP, B3LYP, revTPSS, M06L, M06, TPSS, CAMY-B3LYP.
Calculation of some types of phase diagrams of binary solutions in the framework of the generalized lattice model
Authors: Zakharov M A 
Published: November 2019

Abstract
A brief review of the methods of calculation of the basic types of binary phase diagrams is done in the framework of the generalized lattice model. The construction of binary phase diagrams with unlimited and limited solubility of the components in the solid state, the phase diagrams of the eutectic types is considered.
Complex index of a system’s quality for a set of observations
Authors: Zhgun T V 
Published: November 2019

Abstract
This paper discusses the solution to the problem of constructing latent complex indexes of a change in a system’s quality for several observations in the absence of training. The algorithm for constructing complex indexes is implemented with the definition of non-random variables of the principal component characterizing the structure of the system under discussion. The algorithm uses a new approach to choose the principal component number, determine the weights of the considered variables and subsystems, and to determine the information content of the complex index based on the selected signal-to-noise ratio parameter. The algorithm was used to obtain complex indexes of quality of life for Russia’s constituent entities for 2007-2016.
Method for evaluating the robustness of rankings generated by composite indices
Authors: Zhgun T V 
Published: November 2019

Abstract
Characteristics of the quality of many systems in the economics, politics, society is in the form of a composite index, take the form of a linear composite index that linearly aggregates over several dimensions using a weight vector. The construction of the complex indexes of a system can be considered as the task of extracting the useful signal from the background noise. The signal in this case is the weights of the linear convolution of the indicators, which should reflect the structure of the system being evaluated. Principal component analysis determines the structure of the principal components for successive observations differently. The reason for this may be the presence of fatal errors in the data used. A modification of the principal component method that takes into account the presence of errors in the data used determines the structure of the system unambiguously. If the nature of the aggregation method of variables and the choice of weights adequately reflect the system quality model, then to study the reliability of the composite index, it is necessary to investigate the stability of ratings over time. The consequence of stability is on average a slight change (increment) in the rating of objects for different measurements. This increment can be a posteriori estimated by a set of observations on the proposed dispersion criterion. The results of assessing the stability of different integral characteristics by this criterion are given. Complex indexes, calculated by the author’s method, show good stability.
Extending Geostationary Orbit Missions for Lunar Observations
Authors: Silva William R. , Terra Maisa de O. , Celestino Claudia C. , de Melo Cristiano F. 
Published: November 2019

Abstract
This work investigates an alternative strategy to exploit future communications satellite generations including a final stage of lunar observations. For that, we explore impulsive transfers between geostationary orbits and lunar gravitational capture orbits in a full 4-body dynamical model with the Sun, Earth, Moon and spacecraft. Criteria to seek natural transfer orbits between the geostationary orbit and the vicinity of the Moon are defined considering escape properties of trajectories of the Circular Restricted Three Body Problem (CR3BP) as a guide. Namely, we select initial conditions of the 4-body model with energies that favors Earth-Moon transfers that remain around the Moon for a long time. As a case of study, we selected the current Brazilian geostationary satellite Star One C4. After a broad analysis of initial conditions and their transport behavior, we select potential transfers that reaches a near vicinity of the GEO orbit with an sufficiently small inclination with respect to the terrestrial equator. Time evolution of candidate solutions are analyzed and Δν budget and propellant mass are computed. As well as some current proposals for space debris mitigation, our strategy requires that additional mass of propellant besides onboard propulsion systems to perform final maneuvers have to be foreseen in the design of future generations of these communication satellites.
Orbits around the dwarf planet Haumea
Authors: Jean Carvalho P. S. 
Published: November 2019

Abstract
The dwarf planet Haumea is a very interesting celestial body due to the characteristics of its physical form and also the recently observed ring. A Kuiper Belt object, Haumea is a triaxial ellipsoid with dimensions of approximately 513 × 852 × 1161 (km), with a mass of 4.006 × 1021 kg and a rotation period of 3.915341h. The dwarf planet Haumea has its system formed by two natural satellites, the moons Namaka and Hi’iaka. We have presented an analysis of orbits around the dwarf planet Haumea taking into account the influences of the perturbations of its nonsphericity (J2, J4, C22
). We have found that the C22
term and the rotation rate of Haumea have contributed strongly to reduce the variation rate of the periapsis radius of the spacecraft. We have calculated the spherical harmonics of Haumea taking into account the most current values for the semi-axes of the ellipsoid and we have presented a comparison with the values of the harmonics found in other works.
An implementation of the weighted essential non-oscillatory scheme for numerical approximations of the pressureless gas dynamics equations
Authors: Jung SungKi 
Published: November 2019

Abstract
In this study, the Weighted Essential Non-Oscillatory (WENO) scheme is implemented for numerical approximations of the pressureless gas dynamics equations. The Harten-Lax-van Leer-Contact (HLLC) approximate Riemann solver serves as a basic building block with the fifth order WENO scheme involving the first order Lax-Friedrichs scheme as a flux limiter for the numerical stability. In particular, the WENO scheme suppressed the oscillatory around the delta shock waves and the flux limiter guaranteed the positivity of densities around the vacuum. Lastly, numerical testes for one-dimensional problems are presented for capturing the delta shock waves and vacuum.
Equilibrium points stability analysis for the asteroid 21 Lutetia
Authors: Mota Marcelo Lisboa , Rocco e Evandro Marconi 
Published: November 2019

Abstract
This work investigates the stability of the equilibrium points that occur around the asteroid (21) Lutetia, assuming that this body has a constant velocity of rotation and is immersed in a gravitational field, whose force of attraction presents a perturbation with respect to the central force due to the irregular mass distribution of the asteroid. For the calculation of the potential, as well as of the effective potential, was used the method of the expansion of the potential in series, associated to the asteroid decomposition in tetrahedral elements. The zero velocity curves for a massless particle orbiting the gravitational environment were analyzed. The linearized dynamic equation in the vicinity of the equilibrium points, the associated characteristic equation, and the Jacobi constant were calculated. The validation of the results was ratified by simulations of trajectories around these equilibrium points, considering the gravitational field modelled. It should be emphasized the general nature of the procedures adopted in this work, that is, they can be applied to any other asteroid.
Particle-in-cell model of the helicon plasma thruster experiment at the University of Brasilia
Authors: Miranda Rodrigo A. , da Trindade Daniel B. , Luz Jhéssica M. N. de J. , Costa Sarah da , Ferreira José L. 
Published: November 2019

Abstract
In this paper we describe a numerical model of a helicon plasma thruster device currently under development at the Laboratory of Plasmas at the University of Brasilia. The two-dimensional model is obtained by representing the device using a cylindrical geometry, and neglecting variations in the azimuthal direction. The computational code solves the electrostatic equations and the equations of motion of charged particles self-consistently using the particle-in-cell approach. Our model predicts the emergence of a structure similar to a current-free double-layer in the plasma, which has been detected in similar experiments.