bluuebunny/crossref_metadata_2025_split huggingface dataset:
Impact of the capture time on the series resistance of quantum-well diode lasers
Authors: Boni A , Wünsche H J , Wenzel H , Crump P 
Published: May 2020

Abstract
Electrons and holes injected into a semiconductor heterostructure containing quantum wells are captured with a finite time. We show theoretically that this very fact can cause a considerable excess contribution to the series resistivity and this is one of the main limiting factors to higher efficiency for GaAs based high-power lasers. The theory combines a standard microscopic-based model for the capture-escape processes in the quantum well with a drift-diffusion description of current flow outside the quantum well. Simulations of five GaAs-based devices differing in their Al-content reveal the root-cause of the unexpected and until now unexplained increase of the series resistance with decreasing heat sink temperature measured recently. The finite capture time results in resistances in excess of the bulk layer resistances (decreasing with increasing temperature) from 1 mΩ up to 30 mΩ in good agreement with the experiment.
Logic of basic swarm reactions
Authors: Schumann Andrew 
Published: May 2020

Abstract
In the paper, there are defined continuous-valued logical functions defined on [0, 1] as natural reactions of swarm to several stimuli detected at one time step. In this model, the logical duality represented by squares or cubes of opposition is realizable by own swarm patterns based on lateral inhibition and lateral activation. Swarm reactions are considered not certain, but with a probability of their intensity in respect to the distance to an appropriate biologically active substance. At the same time, we can formalize cases when the swarm members are partly inhibited and partly activated. In other words, we assume that they can be less or more inhibited and less or more activated, etc. So, we can deal with a fuzzy mix of conjunction and disjunction at one time.
Information resources usability and split-testing features
Authors: Astachova I F , Makoviy K A , Khitskova Yu V , Burakova N A 
Published: May 2020

Abstract
The article discusses the features of split testing and usability testing. The stages of these two types of testing are proposed. To create a web resource convenient for the user and practical for the business, analytics helps. Ergonomics test (usability testing) is a type of software testing that is aimed at exploring the convenience for users of a web page, user interface or device. At the end of the usability testing, a split (A / B testing) is performed (or not). A / B testing involves setting up two different options for a web page or landing page and sending the same amount of traffic to each page option. Then, the number of conversions for each option is measured and the best is revealed. The best option generates the most conversions. The stages of these two types of testing are proposed. An application is described that allows usability testing of information resources. The developed application supports the function of analysing images according to the main colour schemes, collect statistics selected by the user and upload their PC to an Excel document, independently define areas for collecting statistics.
About the possibility of synchronization in dynamical systems
Authors: Gladkov S O , Bogdanova S B 
Published: May 2020

Abstract
The principle possibility of two metal pendulums synchronization oscillating in the parallel planes, the distance between the suspension points of which is fixed, is proved. This behavior is possible only due to the taking into account two physical factors. The first one is an effect of electromagnetic interaction between them. The second one is accounting the electromagnetic radiation of each pendulum, which leads to nonlinear attenuation. The system of nonlinear dynamical equations of the movement is obtained and its decision are numerically analyzed.
Verbal model of the process of resource distribution with the application of the extractive planning of an enterprise of criminally executive system
Authors: Shugaj O E 
Published: May 2020

Abstract
The article defines the goals and discusses the principles for the formation of control circuits for managing an MIS enterprise. The contours of operational and financial planning, the general scheme of extrapolatory planning of MIS enterprises are considered. A theoretical information contour has been developed for coordinating the distribution of resources based on the goals of the enterprise’s commercial activities.
Analytical study of temperature layer fields of pectin-containing raw material under controlled heat exposure
Authors: Alekseev G V , Moldovanov D V , Leu A G , Dmitrichenko M I 
Published: May 2020

Abstract
Shelf life and quality of raw materials depend on optimal conditions for long-term storage. The optimal storage time, is the longest period, at which the loss of quality and nutritional value of raw materials do not exceed the allowable limit, depends on the temperature and humidity conditions. Throughout the entire storage period, the constant temperature should be maintained as long as possible, since its fluctuations even within +5°C can seriously affect the storage duration. On the territory of the Russian Federation, the temperature of outdoor air changes during the day from about 5 to 15°C, reaching 30°C in some regions. The seasonal temperature also varies significantly. Optimal conditions for storing pectin-containing raw materials are temperature limits of 0−5°C. One of the modes of storage of raw materials is storage in a refrigerated state, when the temperature of the raw materials and the surrounding space is lowered to −10°C. Such conditions can be achieved by equipping storage facilities with artificial cooling. Using thermophysical methods, it is possible to objectively assess the optimal storage conditions for raw materials and predict storage periods.
On a property of curves given by the determining equations
Authors: Bilchenko G G 
Published: May 2020

Abstract
The motion of a mechanical system consisting of a carrier and a load is considered. The carrier, located all the time in a horizontal plane, can move translationally along a rectilinear trajectory. The carrier has a rectilinear channel through which the load can move. The load is considered further on as a material point. The load can move in the channel according to a predetermined motion law. The channel axis is located in a vertical plane passing through the trajectory of the carrier. The Coulomb dry friction model is applied for simulation the forces of resistance to the motion of the carrier from the side of the underlying plane. In the conditions of the carrier motion along horizontal plane without detachment, the carrier motion differential equations are a system of three linear second-order differential equations. The influence of the system parameters on the motion of the carrier from the rest state is studied in the point of view of determining functions. An important property of the determining expressions is proved: the existence of a single intersection point of the curves given by the determining equations, which corresponds to the zero angle of setting of the channel along which the load moves.
Development of solution for control problem based on cascade decomposition method
Authors: Bugaev Yu V , Litvinov D A 
Published: May 2020

Abstract
The problem of simplifying solution of linear dynamic systems with preset conditions at the edges and internal points of the segment is considered. In this regard a modification technique of the existing cascade decomposition method based on obtaining a general formula for the system state and control functions is described. Coefficients of this formula are identified in a recursive way. The formula is presented to obtain the cascade decomposition method and kernel functions of the intermediate step matrices being important for the last step function. Illustratively, a practice-oriented example proves the method advantages in convenience and speed comparing with the conventional method of cascade decomposition.
The development of the atherosclerosis diagnostic models under conditions of unbalanced classes
Authors: Demchenko M V , Kashirina I L 
Published: May 2020

Abstract
The main purpose of this study is to identify, using various methods of machine learning, the most effective markers of atherosclerosis and their main predictors, which can accurately determine the risk of this disease in the human body. In this study, various models and balancing techniques of the initial data set were used, which allowed us to develop the efficient classifiers according to the criteria of sensitivity, specificity and ROC AUC.
Computer simulations of the influence of atomic structure disorder on the hardness of Cu − Ag and Au − Ag alloys
Authors: Desta Okbamichael G , Bykova Maria I , Timoshenko Yury K 
Published: May 2020

Abstract
In this paper, computer simulations of the hardness of ordered and disordered alloys of Cu−Ag and Au−Ag were performed using the Sutton-Chen potential and the GULP software package within several models. In addition, Poisson ratios were estimated. When simulating a chemical disorder, a super-cell containing 108 atoms was built. Numerical experiments have shown that chemical disorder in the studied alloys leads to hardness degradation.
Mathematical simulation of a mass transfer in a cylindrical channel
Authors: Germider O V , Popov V N 
Published: May 2020

Abstract
A rarefied gas flow trough a long circular tube due to pressure and temperature gradients is studied on the basis of the S-model kinetic equation. The Maxwellian mirror-diffuse reflection model is used as the boundary condition on the channel walls. The mass flow rate is calculated as a function of the small pressure and temperature gradients. Similar results presented in the literature are compared. The thermomolecular pressure effect has been modeled and the coefficient of the thermomolecular pressure difference has been calculated at various values of the accommodation coefficient and in whole range of the Knudsen number.
The concept of structural-parametric synthesis and optimization of information systems in conditions of destructive impacts
Authors: Kochedykov S S , Yu Kobzistyy S 
Published: May 2020

Abstract
Currently, information systems have become an integral part of critical information infrastructure. In particular in the energy sector, developed and successfully operated information system in the management of technological, industrial and security measures. Systems in this class are subject to destructive impact and above all by cybercriminals seeking to infiltrate their database, block, or disable electronic equipment control and management. The main feature behind the concept of structural-parametric synthesis and optimization of information systems is that the systems of this class are objects for a formal description, which there is no unambiguous analytical dependencies. In addition, there are significant limitations on the choice of the optimization parameters that cannot be precisely determined at the stage of examination of the object of the synthesis, since they depend on the design solutions. Therefore, structural-parametric synthesis of the information systems cannot be reduced to the solution of the optimization math problems. Requires a special approach, which is able to resolve the difficulties due to the operational management of the course of the synthesis.
Algorithm of group movement of agents with directional antennas and the related game
Authors: Kuznetsov Alexander V 
Published: May 2020

Abstract
We describe one of the possible methods for organizing a control and communications system for agents such as unmanned aerial vehicles with directional antennae. A special kind of cellular automaton was proposed with an adjacency between cells changing every cycle to describe the group movement of agents forced to synchronize, as well as the corresponding game.
A computational experiment based on a nonlocal search algorithm using potential theory
Authors: Medvedev S N , Medvedeva O A 
Published: May 2020

Abstract
We consider a general method to derive an optimization algorithms based on potential theory. This theoretical approach is based on the randomization of an objective function and the computation of directional derivatives of the randomized functional. Using the gradient of the potential field we consider algorithm in terms of the means of the underlying movements in the space of random vectors. Effectively, this process combines the exploration power of random-search algorithms with the exploitation power of direct-search algorithms. At the end we offer the results of a computational expert.
Starting control of vibrations of points of a rectangular membrane
Authors: Tukhtasinov M T , Abdualimova G M 
Published: May 2020

Abstract
The problem of starting control of the vibration of points of a rectangular membrane with fixed boundaries is considered. The concept of implemented functions for these membrane points is introduced. For each function being implemented, valid controls are defined that form the control sets. The structure of the control set is studied. The problem is solved in the game setting, the initial player controls the initial position of the membrane, the second, the initial speed. The criterion of the quality of control is determined by the control standards with which the functional is built. The saddle point of the functional and the equilibrium situation of the game are found.
The use of the model of kinetics of ethylbenzene dehydrogenation to estimate the state variables and catalyst performance under unsteady conditions
Authors: Popov A P , Tikhomirov S G , Neizvestny O G , Kharlampidi Kh E 
Published: May 2020

Abstract
The article considers the application of the mathematical modeling method to describe the dynamics of the catalytic layer state variables of the styrene production reactor. This method was carried out using a kinetic approach for description of chemical transformations, which occurs in a multicomponent gas mixture. The main physical processes, affecting the decrease in catalytic activity during operation, are considered and the relationship between them is described. A method for increasing the efficiency of the catalytic system in terms of ACS (automated controlling system) synthesis is proposed. The mathematical formulation of the problem of creating a predictive program control system under unsteady conditions is completed. Mathematical software has been developed that allows us to evaluate activity and predict the dynamics of changes in such production efficiency indicators as ethylbenzene conversion and styrene selectivity. In that framework, the blocking of catalyst active centers, proceeding by the sequential mechanism of coke formation, is classified as a deactivating factor. The distribution patterns of carbon along the length of the reaction space at different times of the catalyst inter-reactivation period, depending on changes in the mixture component concentrations and the temperature condition, are revealed. Based on the production data, the calculation and approximation of raw materials conversion values and selectivity for the target product were carried out taking into account the accumulation of carbon on the layer surface, as well as the variation of process parameters such as temperature, pressure of the reaction mixture and partial pressures of the components.
Automated synthesis of band-pass filters with current to voltage conversion with given transfer gain in the Simone circuit designer
Authors: Ananev A V , Prikota A V , Gorovoy A V 
Published: May 2020

Abstract
The iterative method for automated synthesis of band-pass filters with current to voltage conversion with a given transfer gain is developed. The structure of the synthesis system of LC circuits with a given voltage transfer coefficient is presented. The implementation of the proposed method in SimOne Circuit Designer plugin is shown. Further ways for method development are suggested.
Numerical mathematical model for calculating ion density in the gas-discharge chamber of a radio-frequency ion thruster
Authors: Gordeev S V , Kanev S V , Khartov S A 
Published: May 2020

Abstract
The mathematical model for calculation of the ion density in the gas-discharge chamber of a radio-frequency ion thruster is developed. The model is based on the assumption of higher potential of the central plasma volume comparing to the chamber walls due to higher mobility of electrons. Firstly, the initial approximation for the plasma potential is set and parameters of the ion trajectories in quasistationary electric field are computed. Then, from the assumption of keeping the total ion flow for each trajectory, the ion density is computed as well as the next approximation for plasma potential. The computation is performed iteratively until the change in the ion density is less than the predefined small value. The model was verified by comparing the results of numerical simulation with the analytical solution for spherical volume. The high accuracy of the numerical model is shown. Also, the ion density in the discharge chamber of a radio-frequency ion thruster was calculated with the uniform distribution of neutral atom density and coefficient of ionization rate. It was shown that at such conditions the ion density has a maximum in central part of the discharge chamber and it decreases towards the walls.
Method of assessing the «usability» characteristic of the functioning quality of information protection systems
Authors: Kadnova A M , Khvostov V A , Drovnikova I G , Gulyaev O A 
Published: May 2020

Abstract
The article is devoted to solving the practical problem of assessing the quality characteristic of the information protection system –«usability». In the course of his/her work, the security administrator of the automated system, built in a secure execution, makes a number of technological operations restricted by regulatory and administrative documents. At this, the prompt of such operations is determined by the characteristics of the interfaces of the software modules of the information protection system (IPS). In this regard, the assessment of the quality characteristic of the IPS «usability» becomes relevant for the category of users - security administrators. A meaningful analysis of the activities of this category users of information systems showed that it is appropriate to assess the “usability” based on operational, temporal and probabilistic indicators. The methodological basis for assessing these indicators is an experimental measurement of the average execution time of each operation by a representative group of users, followed by an analytical prediction of the probability of their execution.
Usage of production-based expert system and neural network for signal recognition
Authors: Donskih D N , Barabanov V F 
Published: May 2020

Abstract
At the current paper the system of signal type automatic recognition for the problem of automated testing of radar stations based on collaborative usage of production system and neural network set is presented. The main approaches for solving the problem of automated recognition digital and analog modulation types are shortly outlined. Characteristics calculated based on time-domain and frequency-domain signal representation, typical for the radar impulses are considered. The structural schema of the software for automated classification of radar impulses is presented.
Model and algorithms of interaction of the snow avalanche with the stirrable and destructible obstructions
Authors: Kalach A V , Karpov S L , Soloviev A S , Karpov L D , Sitnikov A I 
Published: May 2020

Abstract
A model for studying the movement of avalanche-hazardous snow masses based on the method of smoothed particles is presented. This approach has been shown to be most appropriate in modelling environments prone to fragmentation. The impact of the snow avalanche on vehicles and the dependence of the affecting factors on the thickness of the snow cover and the terrain have been investigated. It has been found that with snow cover thickness up to 0.5 m, avalanche does not lead to loss of vehicle controllability. The results of the modelling at a qualitative level coincide with the real effects of the avalanche on the vehicle, which confirms the adequacy of the model developed.
Study of the influence of cross section sizes of the rod shock system on the efficiency of shock pulse energy transfer to the deformation center
Authors: Kirichek A V , Barinov S V , Yashin A V , Konstantinov A M 
Published: May 2020

Abstract
Using the finite element model of the shock system, the efficiency of the shock pulse energy transfer to the deformation zone under wave strain hardening is studied. It was established, that conducting research from the point of view of the efficiency of transferring the shock pulse energy to the deformation zone, and from the point of view of the design of the shock pulse generator, is advisable on shock systems in which the contacting ends of the striker and the waveguide have equal diameters. Studies showed that with ratios 1<L1/L2<10; 5<L1/d1<10, an increase in the fraction of the shock pulse energy transmitted to the deformation zone n exceeds 80% for the striker and waveguide with diameters of 30, 48, 60, 90 mm. According to the adopted optimization criteria, the geometrical dimensions of the striker and the waveguide are determined, which ensure the transfer of the largest amount of shock pulse energy to the deformation zone.
Research of radon transport processes in anisotropic media
Authors: Krizsky V N , Nafikova A R , Kozlova I A , Yurkov A K 
Published: May 2020

Abstract
The study of radon migration in geological environments is relevant for the search and contouring of oil and gas deposits, the search for uranium and thorium ores, environmental mapping when choosing sites for the construction of industrial and residential structures, and for predicting events in seismic activity zones. The paper considers a mathematical model of the three-dimensional problem of radon diffusion-advection in piecewise constant layered media with inclusions, taking into account the anisotropy of the diffusion properties of subregions of the geological environment. A combined method for solving the problem is described, based on a combination of the methods of Laplace integral transformations, integral representations with the construction of the Green function of the host layered medium, and Fredholm integral equations of the second kind arising at the boundaries of local inclusions. The results of a comparison of the data of computational and natural experiments for some special cases are presented. A mathematical model of the inverse geometric problem of search for the boundary of a local inclusion is presented.
The spectral theory of graphs at researches of fuzzy models of the determined regular structures of network information systems
Authors: Mezhuev A 
Published: May 2020

Abstract
Operation is devoted the decision of the task increase of structural stability and information efficiency of network information systems on the basis of mathematical apparatus of the theory of fuzzy sets and the spectral theory of graphs. For this purpose introduction of two variants fuzzy structural (channel and nodal) is offered to redundancy of the determined regular topology of network information systems. Functions of an accessory of separate structural elements to which in correspondence the modes of an information exchange which are representing itself as requirements to structural characteristics of system are defined. Analytical and imitative modeling for research of influence fuzzy redundancy on the main structural parameters of the determined topology and estimation of information efficiency of the received structures of network information systems is conducted. Results of modeling showed perspectivity of the offered approach at implementation of structural adaptation of systems to changing conditions of an information exchange.