bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of stabilizers on the properties of porous rubbers
Authors: Zhansakova K S , Russkikh G S , Eremin E N 
Published: May 2020

Abstract
This work is devoted to identifying the patterns of influence of the Lubstab series stabilizers manufactured by LLC NPF Khiminvest on the technological, physicomechanical and thermophysical properties of porous rubbers based on styrene-butadiene rubber with the addition of azodicarbonamide as a porophore. It was found that the addition of the Lubstab 05 stabilizer allowed us to obtain vulcanizates with higher porosity as compared to other samples. A 7% decrease in apparent density as compared to the standard was achieved.
The influence of filler dispersity on radio-absorbing properties of material based on synthetic rubber
Authors: Eremin E N , Kukushina K G , Filatova T N 
Published: May 2020

Abstract
The article considers the features of changes in the radio-absorbing properties of an elastic absorber with a change in the dispersion of a functional filler. The technology of preparing the absorber and filling the covers of amplifiers in the microwave range is described. The results of the analysis of carbonyl iron powders by the methods of X-ray phase analysis, laser diffraction, scanning electron microscopy are presented.
It has been shown that a decrease in the particle size of carbonyl iron by mechanical activation helps to reduce the frequency unevenness.
Application of Elliptic Equations for the Study of Asymptotic Distributions of Temperature and Moisture Content During Drying by Electromagnetic Radiation
Authors: Afanas’ev Anatoliy , Bakhracheva Yulia 
Published: May 2020

Abstract
A new approach is proposed to study the processes of heat and moisture propagation during drying by electromagnetic radiation. It consists in the fact that transient processes preceding the constant drying speed mode are excluded from the calculations. Thus, the initial boundary value problem for two related parabolic equations can be replaced by two independently solved boundary value problems for elliptic equations. On this basis, a numerical algorithm was developed to study the temperature and moisture content fields when drying samples of arbitrary shape. It can be used in all cases where transients are not of interest.
Chaotic signal masking based on orthogonal polynoms
Authors: Belim S V , Yu Belim S 
Published: May 2020

Abstract
The article discusses the approach to encoding information based on families of orthogonal polynoms. The discrete signal is represented as a superposition of orthogonal polynoms. This approach allows to be transmit the useful signal in a chaotic container without matching the parameters of the noise generators. Different orthogonal functions families are considered: trigonometric functions and, Lagrange polynomials. The parameters of orthogonal polynoms families have been studied to increase the stability and stealth of the signal. The computer experiment is made. The average number of decoding errors is calculated depending on the numerical integration step. Orthogonal polynomials require significantly larger calculations to decode the message.
Mechanisms for optimization of detection and correction of text errors based on combining multilevel morphological analysis with n-gram models
Authors: Jumanov I I , Karshiev Kh B 
Published: May 2020

Abstract
In the article the problem of increasing the information reliability in electronic document management systems is formulated, and mechanisms for controlling and correcting spelling and errors with semantic values are developed on the basis of a combined multilevel morphological analysis with n-gram models, a typical search, recognition, and classification tools. Mechanisms for verifying the spelling of a word on the basis of a vector representation of variables and comparison with a standard analogue are proposed according to the principles of using statistical, natural, structural, technological, semantic information redundancy. The solutions to the problems of increasing the information reliability based on a set of keywords, phrases, terms by comparing with virtual, frequency dictionaries located in the electronic document database and knowledge base are obtained. A technique has been developed to optimize control mechanisms and correct spelling errors based on the use of logical, semantic and structural - technological links, cross-relationships between individual or groups of words, phrases in the text information. The obtained tools to increase the reliability of the texts of electronic documents are tested in real condition, the results are compared with the conclusions of the system experts.
The Pareto set reduction in bicriteria customer order scheduling on a single machine with setup times
Authors: Kovalenko Yulia V. , Zakharov Aleksey O. 
Published: May 2020

Abstract
A bicriteria customer order scheduling problem is investigated in the context of the axiomatic approach of the Pareto set reduction proposed by V. Noghin. We construct families of the instances with various structures of the Pareto set and theoretically analyze the Pareto set reduction.
About the probability of the occurrence of binary palindromes in the computer data
Authors: Lyubimov V V 
Published: May 2020

Abstract
The aim of this work is to obtain expressions to calculate the probability of the occurrence of binary palindromes in a finite equally probable combination of zeros and ones. The classical definition of probability is applied in the calculation of the probability of the occurrence of binary palindromes. The key results of the study are presented in the form of two theorems. Furthermore, the consequences of these theorems and characteristic examples of calculation of the probability of the occurrence of the palindromes are considered. All formulated statements are supported by proofs. The main results of the work can be used when analyzing computer data stored in a binary code.
Transitive digraph groups
Authors: Noskov Gennady A. 
Published: May 2020

Abstract
In the present paper the class of digraph groups is introduced by analogy with the prominent class of “graph groups”. Digraph groups implicitly present in the previous work by the author on the automorphism groups of graph groups. The structure of transitive digraph groups is described in terms of the Levi decomposition into the semidirect product of the Steinberg groups and the nilpotent radical.
Optimization of nodes of Newton-Cotes formulas in the presence of an exponential boundary layer
Authors: Zadorin A I 
Published: May 2020

Abstract
The problem of numerical integration of a function of one variable with large gradients in the region of the exponential boundary layer it is studied. The problem is that the use of composite Newton-Cotes formulas on a uniform grid leads to significant errors when decreasing the small parameter ε, regardless of the number of nodes of the basic quadrature formula. In the paper it is proposed to choose nodes based on minimizing the error of the composite Newton-Cotes formula. It is proved that the minimum error is achieved on the Bakhvalov mesh, while the error of the quadrature formula becomes uniform in the small parameter ε.
Influence of scandium concentration on parameters of piezoelectric transducer based on aluminum scandium nitride
Authors: Kozlov A G , Torgash T N 
Published: May 2020

Abstract
An analytical approach is presented that allows one to determine the influence of the scandium concentration on the input electrical impedance of piezoelectric transducer based on aluminum scandium nitride. The scandium concentration dependences of the properties aluminum scandium nitride affecting on the transducer impedance were determined by means of the approximation of the dependences obtained from their experimental values for various Sc concentration. Based on the frequency dependences of the impedance the influence of Sc concentration in Al1-xScxN piezoelectric layer on the frequencies of the serious and parallel resonance of the unloaded and loaded transducer has been established.
Determination of optimum deposition conditions amorphous silicon thin films
Authors: Strunin V I , Khudaibergenov G Zh 
Published: May 2020

Abstract
The aim of the study is to increase the efficiency of solar cell elements on the basis of thin films of amorphous-nanocrystalline silicon, by incorporating silicon nanocrystals (Si-NPs) into a film of hydrogenated amorphous silicon (a-Si:H). The purpose of the operation is to work out optimum deposition modes of amorphous silicon films. An obstacle here is the occurrence of dust particles affecting the properties of the resulting films. As well as increasing the overall efficiency of photocells due to the creation of single-crystal quantum dots (nanocristalites), which will play the role of centers of flow of parasitic currents. The obtained samples were studied using physical methods of analysis (Raman light scattering, study of the band gap).
Thermal decay rates for an asymmetric cusped barrier at strong friction
Authors: Zakharov A V , Chushnyakova M V , Gontchar I I 
Published: May 2020

Abstract
The thermal decay of a metastable state over an asymmetric cusped barrier in the regime of overdamping (strong friction) is considered. This seems to be of importance for the nanoscale experiments on pulling polymeric molecules. The decay process is simulated numerically through computer solving of the Langevin equation. The quasistationary rates RD
, as well as the mean lifetimes and transient times, are extracted from the numerical time-dependent rates Rn
(t). The impact of the backscattering on the value of RD
is discussed. The approximate analytical decay rate is derived for the asymmetric cusped barrier. The numerical results are confronted with this formula and with another analytical formula (the integral Kramers rate) available in the literature.
Improving energy performance of hydraulic torque converters
Authors: Antsev V Yu , Trushin N N , Plyasov A V 
Published: May 2020

Abstract
Torque converters are widely used in the transmissions of self-propelled vehicles for various purposes on wheeled and tracked chassis. A significant drawback of torque converters compared to mechanical transmissions is their relatively low efficiency. Therefore, the task of ensuring high efficiency values of torque converters in the entire range of gear ratios has been of importance since the invention of these hydraulic machines. Torque converters have the lowest efficiency values in the torque transformation mode among low and medium gear ratios from 0 to 0.7. In addition, the nature of the change in efficiency for an integrated torque converter in automatic transition to the fluid coupling mode also usually decreases sharply. This article discusses a number of motor and tractor torque converter designs aimed at obtaining high values of efficiency in the range of small or medium gear ratios. The considered technical solutions are associated with a reduction in energy losses when the working fluid enters the pump wheel of the torque converter.
Acceleration control in active dynamic vibration damper
Authors: Buryan Yu A , Sitnikov D V , Silkov M V 
Published: May 2020

Abstract
The paper deals with the planar problem of vibration isolation. The active vibration damper is mounted on an oscillating mass with a vibroactive unit at a point that does not coincide with the mass center and the action of the vibroactive force does not coincide with the mass center. An active dynamic vibration damper is an electrodynamic drive in which the translational movement of the moving mass is carried out according to information about acceleration from an accelerometer mounted on an oscillating mass with a vibroactive unit. The paper gives an assessment of the vibration isolation effectiveness, depending on the mismatch with the mass center of the vibrational force application points, the settings of the active damper and accelerometer.
Finite element modeling of a multifaceted composite lattice anisogrid payload adapter for launching several spacecrafts
Authors: Khakhlenkova A A , Moskvichev E V , Lopatin A V 
Published: May 2020

Abstract
The paper presents the design of an adapter to launch several spacecraft. The adapter is a multifaceted composite lattice anisogrid shell. The technique for creating a finite element model of the presented lattice adapter is developed. The influence of structure parameters on the fundamental frequency of oscillations is studied. The results of solving the stability problem for flat lattice panels of the adapter during compression and bending are presented.
Some questions of the contact interaction theory in two-roll modules
Authors: Khurramov Sh R 
Published: May 2020

Abstract
The study is devoted to the analysis of contact stresses distribution in a two-roll module. The results of the study of the theory of contact interaction in two-roll modules are presented: an analytical description of the curve shape of the roll contact and determination of the relationship between tangential and normal stresses. Mathematical models of the roll contact curves and the friction stress models in a generalized two-roll module are determined. The obtained models are general in the sense that they are applicable for partial cases of interaction in two-roll modules. Formulas are found for calculating the neutral angles of two-roll modules. Dependencies between the forces acting in the rolls and the stresses distributed under the influence of these forces are stated. It is revealed that these dependences do not change with a change in the angle of supply of the material layer to the line of centers and the angle of inclination of the upper roll relative to the vertical.
Study of the crawler crane stability affected by the length of compensating ropes and platform rotation angle in the mode of movement with payload
Authors: Korytov Mikhail S , Shcherbakov Vitaly S , Titenko Vladimir V , Belyakov Vitaly E 
Published: May 2020

Abstract
Payload uncontrolled oscillations arising during movement of a loaded self-propelled crawler crane at a construction site were reduced by equipping the crane with two additional compensating ropes equal in length and connecting the rotating platform to the load gripping device. This also increased the stability of the entire system. The stability margin moment was used to evaluate the crane stability at individual tipping axes of the crawler support contour. While moving along a random microrelief surface, under the varied length of the compensating ropes and the platform rotation angle, the length reduction increased the mathematical expectation of the stability margin moment for the most loaded lateral tipping axis. The smallest values of the stability margin moment were obtained at the platform rotation angle close to 90 degrees, with the crane stability index being most affected by the compensating rope length. At a zero platform rotation angle, the compensating rope length effect on the stability at the most loaded lateral axis was insignificant. The regression equation of the average stability margin moment affected by the compensating rope length and the platform rotation angle was obtained. The results can be used in the design of advanced self-propelled cable electric crawler cranes.
Studies on dynamic deformations of magnetorheological elastomer
Authors: Minaev A Ja , Korovkin Ju V , Stepanov G V , Valiev H H 
Published: May 2020

Abstract
Oscillograms of changes in the accelerations of amplitudes, phases and oscillation frequencies under the action of specified loads at the input and output of the test sample of magnetorheological elastomer are recorded and analyzed. At the input, the sample is loaded with a smoothly increasing harmonic force arising from the imbalance of the unbalanced rotor of the electric motor. At the output, the sample is loaded with a magnetic field created by a neodymium magnet. A comparative analysis of the accelerations and oscillation phases of the test sample is given. An actively controlled damper based on a magnetorheological elastomer has been developed.
Hydroelastic response of a circular sandwich plate interacting with a liquid layer
Authors: Mogilevich L I , Popov V S , Popova A A , Christoforova A V 
Published: May 2020

Abstract
We considered the formulation and solution of the forced oscillations hydroelasticity problem for a three-layered circular plate contacting with a viscous incompressible fluid layer, the pressure in which varies according to the harmonic law. The plate is the bottom wall of a narrow channel completely filled with a viscous fluid. The axisymmetric coupled hydroelasticity problem consisting of the plate dynamics equation, the viscous fluid layer dynamics equation, and their corresponding boundary conditions was investigated. We obtained the plate dynamics equations taking into account inertia forces in the radial and normal directions in the framework of zigzag kinematic theory. In these equations, the load was expressed by the stresses of the viscous fluid contacting with the three-layered circular plate. The fluid dynamics equations were represented by the Navier-Stokes equations and continuity equation written for the case of creeping fluid flow in a channel. We obtained the forced radial and bending hydroelastic oscillations equations of the circular three-layered plate using the perturbation method. The solution of these equations was represented by a series of eigenfunctions of the corresponding Sturm-Liouville problem. We have also presented the numerical study results of the radial and bending vibrations amplitude dependence on the frequency for the main steady oscillations mode of the plate.
Justification of instrument parameters for the construction soil strength determination
Authors: Tarasov V N , Boyarkina I V , Boyarkin G N , Serebrennikov V S 
Published: May 2020

Abstract
A portable instrument has been introduced in the construction industry of the Russian Federation for the determination of soil strength grades, which is based on the free weight falling principle. Until the present the theory of such instrument hasn’t yet been completely developed and needs to be improved. In this study on the basis of the theorem on normal stresses on surfaces of a cone to be penetrated into the soil, a logically justified theory of the instrument basic parameter selection has been developed. Stresses on horizontal areas of construction soils are equal to twice the stresses on inclined areas of the cone. At the end of the working section of a rod to be penetrated into the soil there is a round flat punch, which area is A=1 cm2. During the punch penetration into the soil by an impact method, a soil compacted cone body appears before the flat punch, which is affected by normal pressure forces and tangential friction forces. For the first time the equation of normal stresses σ1 has been obtained on inclined areas of the soil cone. The mathematical model of the instrument doesn’t contain soil parameters, that allows to recommend it for any soil and media. The obtained analytical dependences allow to design similar instruments in order to measure the soil strength using any value of the falling weight mass. In this paper the instrument parameter justification has been made with the impact weight mass m
1 = 2.5 kg.
Experimental research of vertical movements and accelerations of the drum vibrations of the DM-617 vibratory roller during soil compaction
Authors: Tyuremnov I S , Morev A S , Furmanov D V 
Published: May 2020

Abstract
Rheological modeling of how the elements of a vibratory roller during soil compaction interact with each other allows the optimization of parameters of the roller and soil compaction modes based on the study of the obtained model, as well as the improvement of the soil compaction continuous control system, and the solution of other practically important tasks. To verify the models, it is required to compare the calculation results for the models with experimental data. The paper includes the results of experimental studies of the acceleration range for the vibratory drum of the DM-617 vibratory roller during soil compaction in the steady vibration mode, when the vibration is turned on, and when it is turned off. It is established that during the compaction of the soil in question in the range Evd = 14…25 MPa, the range of vertical movements and accelerations of the vibratory drum in the steady vibration mode does not depend on the soil density. When the vibration is turned on, the vertical movements and accelerations of the drum is 1.5…2 times higher than those of the steady mode. When the vibration is turned off, the vertical movements are increased by 1.5…2 times when passing the resonance zone, and the drum accelerations do not exceed the range of those in the steady vibration mode. The obtained results allow the mathematical models of vibratory rollers during soil compaction to be verified not only in the steady vibration modes, but also in transient modes, including passing the resonance areas when switching the vibration on and off.
Socioeconomic studies in the utilizing of livelihood capital to meet the needs of coastal communities
Authors: Darwis  , Saadah  , Amrullah A , Ibrahim T , Bulkis S , Dzulhajrah A S 
Published: May 2020

AbstractPunaga Village is a coastal area that has great potential for proper management. The society is very pluralistic and multicultural. This study aims to determine the utilization of capital livelihood owned or easily accessed in meeting needs. Capital livelihoods are generally used by the community in socializing, networking, finding work and building trust among the community. The analysis method used in this study is a descriptive analysis. The limitation of this study is that most populous coastal communities in the village work as farmers. The results of this study indicate that socioeconomic conditions are very influential in the utilization of capital livelihood that is run by the community. Utilization of capital livelihood in socializing activities or building harmonious relationships is expected to build a sustainable economic system.
Histopathological Study of Kidney and Meat of Bungo Fish (Glossogobius sp) contaminated by Lead Metal (Pb) in Lake Tempe, Wajo Regency
Authors: Risna A , Andriani I , Ashraf A , Omar S B A , Sari D K 
Published: May 2020

Abstract
Bungo fish (Glossogobius sp) is one of the freshwater aquatic fish that is in great demand by the community and is endemic in Lake Tempe and is in the Wallacea region. The purpose of this study was to determine the histopathological study of the kidneys and meat in bungos exposed to heavy lead metals (Pb). The samples used were nine bungo fish with nine kidney and nine meat samples each. Measurement of heavy metal content was carried out with Atomic Absorption Spectrophotometry and obtained the lowest metal concentration of 6.52 ppm, moderate 42.02 and the highest 435.30 ppm in the kidney and in meat, the lowest 0.07 ppm, medium 1.56 ppm, and the highest 4.73 ppm. Organ preparations were analyzed using histotechnique methods and they were analized with descriptive qualitative. Based on observations obtained by damage or histopathology that occurs in the kidneys which shows inflammation of the glomerulus, hemorrhage, formation of connective tissue, vacuoles, necrosis, changes in the number of melanomacrophages and also damage to the tubules, whereas damage to the meat does not occur. The level of damage to the tissue depends on the concentration of the metal contaminated in the fish’s organs. Damages that occur are thought to be caused by exposure to heavy metals dissolved in the waters of the fish ecosystem, which have passed the threshold.