bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of software testing methodology based on quality criteria and expert assessments to mobile applications
Authors: Galimova E Y 
Published: January 2021

Abstract
In this paper, we propose a technique for choosing between a manual, automated and semi- automated approaches to software testing. The great desire of each person to achieve maximum comfort in each of the spheres of life has also affected the international web. The user, wanting to always stay online, uses the phone as a communicator. This led to the emergence of mobile Internet. When staying away from home or during travel and business trips, you can connect using a tablet or mobile phone instead of a laptop. The efficiency and functionality of “mini” computers would not be brought to such a high level without specialized applications. Properly chosen testing methodology improves the quality of mobile applications.
Transverse profile forming for high energy electron beams using 3D-printed plastic samples
Authors: Bulavskaya A A , Cherepennikov Yu M , Grigorieva A A , Gavrikov B M , Loginova A A , Miloichikova I A , Toropkov N E , Stuchebrov S G 
Published: January 2021

Abstract
The work presents application of previously proposed approach for transverse profile forming of high energy electron beams with plastic samples made using 3D printing technology. The collimator made of PLA (polylactide) plastic is designed and produced in a frame of this work. The results of transverse profile forming for 6 MeV electron beam of clinical linear accelerator Elekta Synergy using designed collimator is presented. Obtained results comparison with data from XiO dosimetry planning system shows good agreement of calculated and experimentally formed by plastic collimator electron beam dose fields.
The influence of load distribution along a line on power and place of connection of a photovoltaic system
Authors: Bogdan A V , Bogdan V A , Garkavyi K A , Netrebko D S 
Published: January 2021

AbstractDistributed generation in the electrical network causes a redistribution of power and leads to a reduction in technological losses and a decrease in voltage deviations for consumers. The installation of additional generators of electric energy based on the use of wind generators and photovoltaic systems has become widespread in the world energy industry, and has now received development in the Russian Federation. It is shown that the connection of an additional source based on photovoltaic systems can reduce losses in a supply line. According to results of the analysis of a possible location of the connection of an additional power supply on a line with a uniformly decreasing or increasing load, it is proved that the greatest reduction in the level of losses in a line is achieved when additional power supply is connected to it in the case of increase in the load from the beginning to the end. Analytical expressions for determination of economically expedient capacities and a place of connection of an additional source for linearly decreasing or increasing specific load of a supply line are presented. There was determined the optimal power of an additional power source in the form of a photovoltaic system and the optimal point of its connection on a line to reduce power losses during power transmission.
The analysis of power system steady-state aperiodic stability with electronic generation
Authors: Fishov A , Murashkina I , Marchenko A , Enkhsaikhan E , Ivkin E 
Published: January 2021

Abstract
One of the main directions of electric power industry development all over the world is the use of distributed small generation, both based on carbon fuel resources with synchronous communication between sources when they are connected to electric networks, and renewable energy sources working in the electric network through frequency-converting devices (electronic generation). The latter leads to the inevitable mass use of inverters in existing AC electric networks. The objectives of this investigation are to study the impact of electronic generation on the modes and stability of existing electric networks and power systems, the formation of requirements for the characteristics of electronic generation control, which minimize the coordination of relay protection and automation with electronic generation in the electric network, as well as increase the reliability of the general electrical mode. The article presents the results study of the steady-state aperiodic stability of the power system with electronic generation, the requirements for their steady-state characteristics and control in the power system.
The Location estimation of seismic wave propagation layer velocities
Authors: Rabinovich E V , Filipenko N Y , Shefel G S 
Published: January 2021

Abstract
On the basis of the original location-based technology developed by the authors for constructing seismic images of the deep structure of the earth’s interiora method is proposed for estimating the seismic wave propagation layer velocities. The technology ensures the unambiguity and stability of seismic imaging by successively solving direct kinematic problems for all reflecting boundaries. It consists in locating the reflection pulse’s sources from the boundaries of the deep section’s layers and restoring the kinematic parameters of the layers through them. To assess the next layer velocity, information is used on the parameters of the preceding boundaries and the direct kinematic problem’s solution with the additional equality’s condition of local velocities at the reflection’s points from the underlying boundary.
AREIOM: adaptive research multicopter platform
Authors: Harradi R , Battseren B , Heller A , Hardt W 
Published: January 2021

Abstract
The applications of unmanned aerial systems have dramatically increased in the late days, in particular within dull, dirty and dangerous missions, where it has been clearly shown that unmanned systems are better suited than manned aircrafts. The reduction of human involvements leads to an increasing demand for autonomous and operationally adaptive airborne systems. In addition, unmanned aerial systems share similar limitations with most computer embedded systems, e.g., limited space and power resources, and increasing computation requirements and complexity of the applications running onboard. To fulfill these requirements and achieve the fundamental features of autonomy and adaptability, the AREIOM—Adaptive Research Multicopter Platform—along with its layered modular architecture and the specific details of its underlying hardware and software components are presented.
Study of the laws of oxidation of biodiesel
Authors: Yudaev S A , Ivashkina E N , Sapunov V N , Voronov M C 
Published: January 2021

Abstract
The paper discusses in detail the first stage of the catalytic oxidation of fatty acid methyl esters with atmospheric oxygen. According to the data obtained as a result of processing the kinetic data, it was concluded that the reactivity of the components of biodiesel. It is established that polyunsaturated and monounsaturated compounds have different reactivity from each other. The kinetic pattern of consumption of unsaturated components of biodiesel was set up and kinetic constants were calculated, which are equal to: oxidation of C18/1 k1 = 0.106 ± 0.008 h−1, and oxidation of C18/2 k2 = 0.269 ± 0.005 h−1, respectively
High-resolution phonocardiogram parameters
Authors: Zemlyakov I Yu , Zdanov D S , Kosteley Y V , Golobokova E V , Dikman E Yu , Bureev A Sh 
Published: January 2021

Abstract
The article describes the results of studying and analyzing phonocardiograms (PCGs) obtained during a physiological experiment with Blu-ray standard equipment. It provides the findings of a spectral and spectral-time analysis for signals with a sampling frequency of 10, 44.1 and 192 kHz. It shows that the differences in the PCG spectra of identical signals are unreliable. The article specifies the onset and disappearance moments of the harmonic components of heart sounds. It also provides recommendations on the sampling frequency and bit resolution of digitized PCG signals for telemetric systems.
A system-inno-diversified approach to the development of technologies for the effective transformation of organizations of the agro-industrial complex into a digital economy
Authors: Chernyakov M K , Chernyakova M M 
Published: January 2021

Abstract
The paper examines the most important trends and concepts of the modern stage of digitalization and the end-to-end technologies offered by the “Digital Economy” program. The necessity of creating a technology of regulation by the agro-industrial complex as an important component of the modern digital economy is substantiated. The aim of the research is to develop technologies for the effective transformation of the organizations of the agro-industrial complex into a digital economy. According to the definition of the digital economy proposed in the work, it should be built as an in-diversified, self-developing system. The concept of technology for regulating the digital economy of the agro-industrial complex should be formed on the basis of a systematic approach and have a hierarchical 5-tier network structure. The possibility of implementing the structure using the mathematical apparatus of the theory of Petri nets is substantiated. It has been established that model design of technology is the most optimal, if not the only possible way to improve the structure of production systems and technological processes of organizations of the agro-industrial complex, as well as to manage its structures.
Application of neural networks in problems of determining geometrical properties of objects placed in geophysical elastic media
Authors: Morozov A E , Yakimenko A A , Karavaev D A 
Published: January 2021

Abstract
The use of a neural network approach is associated with high requirements for software implementation. The main criteria is a high degree of accuracy in the recovery of the desired geological-physical model of the environment (GPME) and processing speed. The paper presents a description of the developed neural network architecture for solving the inverse problem of geophysics for determining the geometric properties of GPME objects. The performance of a single neural network and an ensemble of neural networks (NN) has been evaluated. The results are presented comparing the operating time of the NN when restoring models on various computing devices: CPU and GPU. The results of experiments on the restoration of various GPME using the developed NN based on the LSTM layer and the U-Net architecture are presented. This work was supported by the RFBR grant No. 19-07-00170.
Application of standard ZET-algorithm for gaps filling in wide area measurement system data assets
Authors: Batseva N L , Foos J A 
Published: January 2021

AbstractThis article explores the application of Standard ZET-algorithm for gaps filling in Synchronized Phasor Measurement data assets received from Wide Area Measurement Systems. In spite of Synchronized Phasor Measurement data assets apparent advantages, they have gaps affecting the accuracy of solving power engineering tasks. Authors analysed the reasons of gap occurrence in data assets, provided experiments with voltage and current data assets and collected the key points about application of Standard ZET-algorithm.
Numerical 3D simulation of enhanced oil recovery methods for high-viscosity oil field
Authors: Persova M G , Soloveichik Y G , Ovchinnikova A S , Patrushev I I , Nasybullin A V , Orekhov E V 
Published: January 2021

Abstract
The paper is devoted to the numerical simulation of oil recovery process using the technologies of polymer flooding and surfactants. The simulation is performed on the basis of the finite element method as well as the special scheme of flow balancing and phase flows between the cells, which along with high accuracy of pressure approximation, ensures the conservation of mass of filtering mixture components. The possibilities of simulation of different mechanisms of interaction of injected compositions with a medium are presented. The results of numerical simulation of different reservoir stimulations are shown using the digital model of the high-viscosity oil field in Tatarstan. It is shown that the application of polymer flooding and surfactant-polymer solutions makes it possible to increase the oil fraction in the produced fluid and, consequently, enhance the oil recovery.
Prospects for the development of functional expansion of individual low-cost prosthetic limbs for people with disabilities with intelligent sensors
Authors: Gryaznov D , Zhmud V , Avrmachuk V , Malakhov D , Nosek J , Dimitrov L 
Published: January 2021

Abstract
Despite the development of medicine, as well as robotics aimed at helping people with disabilities, most disabled people with missing limbs cannot hope for a full life with the help of bionic prostheses, since these products are made strictly individually, and their control requires expensive surgeries to implant sensors. In addition, such prostheses themselves are very expensive. An alternative solution is to reduce the cost of such prostheses as much as possible and abandon the implantable sensors of signals of the human nervous system. The paper proposes a method for solving such a problem using a variety of sensors that remove signals from the skin surface without invasive surgery.
Critical technologies in the cluster of virtual and augmented reality
Authors: Zhmud V , Liapidevskiy A , Avrmachuk V , Sayapin V , Sedinkin J N , Hardt W 
Published: January 2021

Abstract
The program “Digital Economy of the Russian Federation”, launched in 2019, contains virtual and augmented reality technologies in its list. Each such technology consists of many assistive technologies called sub-technologies. These assistive technologies make up a large list, while failure to obtain the required results in at least one of these technologies may lead to the fact that the integral technology will not be created. This article discusses a list of only critical assistive technologies, that is, precisely those technologies whose creation is a critical factor for creating a generalized (integral) technology. It is on these technologies that the main emphasis should be placed not only in financing their development, but also in the thorough planning of goals and objectives, in the selection of performers and in the acceptance of research results.
InAlN/GaN and AlGaN/GaN HEMT technologies comparison for microwave applications
Authors: Velikovskiy L E , Sim P E , Demchenko O I , Kurbanova N E , Filippov I A , Sakharov A V , Lundin W V , Zavarin E E , Zakheim D A , Arteev D S , Yagovkina M A , Tsatsulnikov A F 
Published: January 2021

Abstract
High electron mobility transistors (HEMTs) technologies based on AlGaN/GaN and InAlN/GaN heterostructures have been developed. The research focused on influence of epitaxial growth conditions and buffer doping profiles on electrical properties HEMTs. An output power density of 4W/mm at 17 GHz was demonstrated for InAlN/GaN HEMTs and 7W/mm at 10 GHz for AlGaN/GaN HEMTs.
Implementation of vibration signals receiving unit on Raspberry single-board computers
Authors: Faerman V A , Tsavnin A V , Andreev S A 
Published: January 2021

Abstract
The paper dedicated to vibration measurement system development on the Raspberry Pi basis. Main features of the solution are low-cost, easy access to components and functionality and flexibility provided by Raspberry Pi usage. Circuit solution and configuring procedures are presented and described. In particular, block diagram of the vibration measurement system with piezo-electric sensors. Two variants of the vibration measurement system, on the Raspberry Pi B+ and Raspberry Pi 3B correspondingly, were implemented and tested as well. In addition, two variants of impedance-matching device were implemented. Conducted and described experiments confirm performance both separate components and the whole solution. Presented results are applicable for correlation leak detectors new algorithmic solutions and in educational process.
Compatibility of the dimensions of polymer molecular aggregates to the pore throat of a reservoir
Authors: Na Risu , Erofeev V I 
Published: January 2021

Abstract
The compatibility of the dimensions of the polymer molecular aggregates and the pore throat of the reservoir were studied. The W section of Tuha oilfield was the study area and polymers produced by Daqing Refining and Chemical Company were used. The permeability limit of the polymer molecules with different molecular masses and concentrations, matching relationship between the dimension of polymer molecular aggregates and pore throat were obtained by experiments. The results of the research are important for the development and implementation of a polymer flooding technical scheme in the middle and late stages of the operation of the Tuha oilfield.
Modelling and performance analysis of DWDM passive optical network
Authors: Sadinov S M , Angelov K K , Kogias P 
Published: January 2021

Abstract
Passive optical networks are emerging as the main technology for building access networks. The current metropolitan optical communication networks operate at 1Gbps, which appears to be insufficient for the future development and exponential growth of traffic from IP services. The existing various traffic-intensive services and the growing interest in 4K video content and streaming services require the introduction of new solutions within passive optical networks (PON). A promising option is the combination of 10 Gbps and above high-speed data transmission with spectral multiplexing. DWDM will provide the required high spectral efficiency, but in contrast will require the use of a proper modulation scheme to achieve a longer distance. In this paper a model for performance analysis and solving optimization problems for DWDM-PON networks is developed. Different signal modulations are considered and a comparative analysis is performed. The behaviour of the system at different input parameters is modelled. Performance analysis is performed by evaluating the spectral characteristics and values of BER and Q-factor.
Experimental study and analysis of hydraulic characteristics of diaphragm (chamber) gas flow meter
Authors: Tsankov P G , Georgeva NA , Delcheva S G 
Published: January 2021

Abstract
In the conditions of life, the most common household gas flow meters are diaphragm (chamber) flow meters. From a technical point of view, hydraulic and durability characteristics are important A basic requirement that must be met by measuring instruments used for industrial or domestic applications is to be as accurate as possible. The diaphragm flow meter type BK G2.5T was experimentally studied in the work. The hydraulic (resistance) characteristic Δp = f (Q) of this type of flow meters is obtained and it is derived the analytical dependence of this characteristic - square parabola and means pressure drop at a nominal flow rate – Δpm = 0,4 mbar. The established pulsation character of the operation of the diaphragm flow meter is analyzed by the introduced one the characteristic of the pressure pulsations δp = pmax - pmin = f (Q), as for the specific flow meter the pulsations are δp = 0,1…0,2 mbar. The original results from obtained researches will be useful for constructors for optimization of the design of the gas systems.
Fly ash zeolites as a dual system for simultaneous CO2 capture and its utilization in the production of synthetic gas
Authors: Zgureva D M , Boycheva S V , Filipov K B 
Published: January 2021

Abstract
The deepening of global environmental problems caused by carbon emissions (CO2) generated by various industries requires the development of technological solutions to limit their emitting into the atmosphere. Electrical power plants that use organic fuels as a primary energy source are serious emitter of CO2. The current legislation prerequisites the implementation of technologies for carbon capture and utilization (CCU - Carbon Capture and Utilization) situated at the plant site. In our previous studies, we successfully applied the zeolites synthesized from fly ash obtained from combustion of lignite coal as solid adsorbents for selective capture of CO2 in equilibrium and dynamic conditions. The aim of this study is upgrading of the fly ash zeolite utilization in a dual system for simultaneous carbon capture and CO2 utilization for production of synthetic gas. Experiments were performed in a stainless steel laboratory reactor Büchiglasuster Miniclave 100 in equilibrium conditions at CO2 pressure of 0.25 MPa with different duration. The solid samples saturated with CO2 and reaction products were extracted from the reactor and subjected to gravimetric analyses and Furier-transform infrared spectroscopy (FTIR). The characteristic vibrations of C2H2n+2 molecules were observed onto FTIR spectra of the samples after their exposure for long time.
Studies on the thermochemical energy storage in the coal ash zeolite/water system
Authors: Boycheva S V , Zgureva D M , Marinov I K , Miteva S , Yankov I , Ivanov A , Asenov A N 
Published: January 2021

Abstract
Deterioration of the air quality and the greenhouse effect requires replacement of the conventional fuels with renewable energy sources (RES). The main disadvantage of RES is the intermittent production of energy during the day and the different seasons. This requires efficient energy storage solutions. Affordable technologies applicable to household-scale heating are thermochemical energy storage systems (TES). TES are usually applied for concentration and storage of solar energy. TES based on zeolites as heat storage media use the exothermic effect of water adsorption. The preferred storage medium is commercial zeolite 13X, which is characterized by high porosity and a large specific surface area. In these systems, the charging is carried out at 130-180 °C and the energy storage efficiency is over 90 %. In the present study, storage media of zeolite X synthesized by the alkaline conversion of coal fly ash was studied in a laboratory assembled TES as a possible substitute of zeolite 13X. The results revealed a micro-mesoporous structure for coal fly ash zeolites (CFAZ) in contrast to the microporous 13X. The charge of TES with CFAZ can be carried out at lower temperatures, while its discharge is enough exothermic. The utilization of coal ash as raw materials for synthesis of heat storage media contribute to many environmental benefits.
Automatic detection of characteristic segments of a recorded ECG signal with noise handling methods
Authors: Glushica B , Aleksovski B , Kuhar A 
Published: January 2021

Abstract
Depolarization and repolarization of the myocard results in specific wave shapes that are recognizable in an ECG signal and are characterized by their length, rise time and amplitude. Changes in these characteristics usually indicate anomalies in the function of the heart. Automatic detection of characteristic segments of the ECG signal is of crucial importance for fast and reliable recognition of artefacts that are further analyzed as a means for setting a diagnosis. In this paper a contribution has been made towards efficient automatic segment detection of real ECG signals recorded in arbitrary conditions in the presence of noise from various sources. The method of accumulated differential and a technique for tracing the wave shapes of the ECG signal using their local extrema have been implemented in the developed algorithm. The implementation of these methods yields an advanced way of handling the noise present in the ECG signal resulting with high precision segment detection and low computational power requirement. The high accuracy of the algorithm has been verified using real signals recorded on 2 lead ambulatory electrocardiograph. Another benefit of the developed algorithm is its speed – it is able to process a 5 minute long recorded ECG signal in 9 seconds.