bluuebunny/crossref_metadata_2025 huggingface dataset:
Composition effect on the carrier dynamics and catalytic performance of CuInS2/ZnS quantum dots for light driven hydrogen generation
Authors: Hu Wenhui , Yang Sizhuo , Huang Jier
Published: December 2019

Water soluble CuInS2/ZnS quantum dots (QDs) represent one of the most promising single component photocatalysts for the hydrogen evolution reaction (HER). In this work, we report the effect of cation composition in CuInS2/ZnS QDs on the carrier relaxation and charge separation dynamics as well as their photocatalytic performance for the HER. With decreasing Cu to In ratio (increasing Cu deficiency), we observed slightly faster electron trapping and carrier recombination but significantly improved photocatalytic activity for the HER. This can be attributed to the enhanced electron transfer (ET) from the sacrificial donor to CuInS2/ZnS QDs resulting from the lower valence band (larger driving force for ET) of QDs with higher Cu deficiency. This work not only provides important insight into the mechanistic origins of the HER but also demonstrated that altering the composition in CuInS2/ZnS QDs is a viable approach to further improve their performance for solar to fuel conversion.
Mitigating tip vortex cavitation by a flexible trailing thread
Authors: Amini Ali , Seo Jeonghwa , Rhee Shin Hyung , Farhat Mohamed
Published: December 2019

Tip Vortex Cavitation (TVC) is a major issue in design and operation of axial hydraulic machines. We investigate the capacity of a flexible trailing thread in alleviating TVC by analyzing the flow-induced motion. For this purpose, a nylon thread with three diameters is cut in various lengths and attached to the tip of an elliptical hydrofoil. The selected threads are flexible enough to become unstable and start to flutter under almost all the tested flow conditions. Due to the vortical flow, an oscillating thread is forced to spiral around the vortex axis. The resulting rotational motion is shown to decelerate the axial velocity in and around the vortex core via two possible mechanisms: first by exerting a local drag and taking energy from the flow and second by increasing the flow fluctuations and turbulent mixing. Our results reveal that a thread becomes more effective in TVC suppression when it is comparable in size with the viscous core of the tip vortex. In fact, a sufficiently thick thread may be sucked into the vortex core under the effect of the pressure field. This results in the hereby-called “whipping” motion that consists of the quasiperiodic coincidence of a part of the thread and the tip vortex axis close to the root. Compared with the rotational motion, the whipping motion is found superior in mitigating TVC. We propose a model that predicts that whipping motion, in contrast to rotational motion, could lead to viscous core thickening, which is validated by the velocity measurements.
On the micromagnetic behavior of dipolar-coupled nanomagnets in defective square artificial spin ice systems
Authors: Keswani Neeti , Das Pintu
Published: December 2019

We report here the results of micromagnetic simulations of square artificial spin ice (ASI) systems with defects. The defects are introduced by the misaligning of a nanomagnet at the vertex. In these defective systems, we are able to stabilize emergent monopolelike state by applying a small external field. We observe a systematic change of dipolar energies of the systems with varying misalignment angle. The fields at which the emergent monopoles are created vary linearly with the dipolar energies of the systems. Our results clearly show that the magnetization reversal of the ASI systems is intricately related to the interplay of defects and dipolar interactions.
Measurement of multiple physical parameters of dense gaseous hydrogen-deuterium mixture under double-shock compression: Evaluating theoretical models from multiple views
Authors: Liu Lei , Chen Qi-Feng , Gu Yun-Jun , Zhang Wei , Li Zhi-Guo , Li Cheng-Jun , Wang Zhao-Qi , Li Guo-Jun , Lan Yang-Shun , Chen Xiang-Rong
Published: December 2019

A series of reverberating shock experiments on the precompressed hydrogen-deuterium (H-D) mixture were performed by using a two-stage light gas gun, and an elaborately designed diagnostic configuration was presented to probe the multishock states of dense fluid H-D mixtures. The particular diagnostics allowed multiple physical parameters, including the equation of state (EOS), refractive index, reflectivity, molecular polarizability, and energy gap, of H-D mixtures under double-shock compression to be simultaneously determined in a single shot. The multiple parameters obtained provide a comprehensive evaluation for existing theoretical models from multiple perspectives. It is found that, compared with the semilocal Perdew–Burke–Ernzerhof xc functional, the EOS data predicted by a nonlocal van der Waals exchange-correlation (xc) functional (vdW-DF1) are in much better agreement with the experimental results. Furthermore, the commonly used Gladstone–Dale relation is not appropriate for describing the refractive index in high-pressure-temperature regions, and the refractive index and reflectivity can be well reproduced by the Heyd–Scuseria–Ernzerhof hybrid xc functional. These observations may provide insights into future theoretical developments and a better understanding of material properties under extreme pressure-temperature conditions.
Self-organized standing waves generated by AC-driven electron cyclotron drift instabilities
Authors: DesJardin I. M. , Hara K. , Tsikata S.
Published: December 2019

The formation of self-organized standing wave structures is observed due to the electron cyclotron drift instability (ECDI) driven by a time-varying external electric field and a crossed magnetic field. Using a particle-in-cell simulation, two standing wave mechanisms are identified: the linear mode and the beating mode. In the former, a standing wave emerges as a superposition of two counterpropagating ion acoustic waves predicted by the linear theory of ECDI. On the other hand, in the beating mode, the plasma wave is in resonance with the applied frequency. Nonlinear resonance of such standing waves results in a change in the dominant wavenumber and frequency. Such counterpropagating plasma waves are consistent with the experimental observations using coherent Thomson scattering in a crossed-field plasma discharge.
Improved semiclassical dynamics through adiabatic switching trajectory sampling
Authors: Conte Riccardo , Parma Lorenzo , Aieta Chiara , Rognoni Alessandro , Ceotto Michele
Published: December 2019

We introduce an improved semiclassical dynamics approach to quantum vibrational spectroscopy. In this method, a harmonic-based phase space sampling is preliminarily driven toward non-harmonic quantization by slowly switching on the actual potential. The new coordinates and momenta serve as initial conditions for the semiclassical dynamics calculation, leading to a substantial decrease in the number of chaotic trajectories to deal with. Applications are presented for model and molecular systems of increasing dimensionality characterized by moderate or high chaoticity. They include a bidimensional Henon-Heiles potential, water, formaldehyde, and methane. The method improves accuracy and precision of semiclassical results and it can be easily interfaced with all pre-existing semiclassical theories.
A pathway to ultracold bosonic 23Na39K ground state molecules
Authors: Voges Kai K , Gersema Philipp , Hartmann Torsten , Schulze Torben A , Zenesini Alessandro , Ospelkaus Silke
Published: December 2019

We spectroscopically investigate a pathway for the conversion of 23Na39K Feshbach molecules into rovibronic ground state molecules via stimulated Raman adiabatic passage. Using photoassociation spectroscopy from the diatomic scattering threshold in the a
3Σ+ potential, we locate the resonantly mixed electronically excited intermediate states

∣

B

1

Π
,
v
=
8
〉

and

∣

c

3

Σ

+

,
v
=
30
〉

which, due to their singlet–triplet admixture, serve as an ideal bridge between predominantly a
3Σ+ Feshbach molecules and pure X
1Σ+ ground state molecules. We investigate their hyperfine structure and present a simple model to determine the singlet–triplet coupling of these states. Using Autler–Townes spectroscopy, we locate the rovibronic ground state of the 23Na39K molecule (

∣

X

1

Σ

+

,
v
=
0
,
N
=
0
〉

) and the second rotationally excited state N = 2 to unambiguously identify the ground state. We also extract the effective transition dipole moment from the excited to the ground state. Our investigations result in a fully characterized scheme for the creation of ultracold bosonic 23Na39K ground state molecules.
Bäcklund transformations, consistent Riccati expansion solvability, and soliton–cnoidal interaction wave solutions of Kadomtsev–Petviashvili equation*
Authors: Liu Ping , Cheng Jie , Ren Bo , Yang Jian-Rong
Published: December 2019

The famous Kadomtsev–Petviashvili (KP) equation is a classical equation in soliton theory. A Bäcklund transformation between the KP equation and the Schwarzian KP equation is demonstrated by means of the truncated Painlevé expansion in this paper. One-parameter group transformations and one-parameter subgroup-invariant solutions for the extended KP equation are obtained. The consistent Riccati expansion (CRE) solvability of the KP equation is proved. Some interaction structures between soliton–cnoidal waves are obtained by CRE and several evolution graphs and density graphs are plotted.
Quantitative temperature imaging at elevated pressures and in a confined space with CH4/air laminar flames by filtered Rayleigh scattering*
Authors: Yan Bo , Chen Li , Li Meng , Chen Shuang , Gong Cheng , Yang Fu-Rong , Wu Yun-Gang , Zhou Jiang-Ning , Mu Jin-He
Published: December 2019

Laminar methane/air premixed flames at different pressures in a newly developed high-pressure laminar burner are studied through Cantera simulation and filtered Rayleigh scattering (FRS). Different gas component fractions are obtained through the detailed numerical simulations. And this approach can be used to correct the FRS images of large variations in a Rayleigh cross section in different flame regimes. The temperature distribution above the flat burner is then presented without stray light interference from soot and wall reflection. Results also show that the extent of agreement with the single point measurement by the thermocouple is <6%. Finally, this study concludes that the relative uncertainty of the presented filtered Rayleigh scattering diagnostics is estimated to be below 10% in single-shot imaging.
Overview of the International Conference on Applied Physics, Information Technologies and Engineering – APITECH - 2019
Authors: Kovalev Igor V , Voroshilova Anna A , Borisova Ekaterina A
Published: December 2019

The overview describes the main directions and results of the International Conference APITECH-2019 held in Krasnoyarsk in September 25-27, 2019. It gives the details about the participants and the proceedings.
Substantiation of uranium mining by ISL based on a geotechnological modeling
Authors: Sadykov M P
Published: December 2019

This article focuses on the use of geo-technological modeling techniques for mine planning and optimizing the extraction of uranium reserves. In the course of the research, there is calculated a time to achieve 80% of the extraction of uranium from each predictive block within an ore-body. These results of uranium mining are analyzed for the entire field based on an annual uranium extraction from each settlement block, taking into account a target total production, the productivity of factory for the enrichment of productive solutions and requirements for the concentration of uranium in working solutions.
Complex of technical tools for fish cells cultivation
Authors: Zavyalova E A , Droshnev A E , Alontseva D A , Bulina K Y
Published: December 2019

The solution of problems of viral diseases of fishes which are quite often arising in an aquaculture requires holding diagnostic actions with use of cell cultures, at the same time creation of new cell lines will allow to expand researches as much as possible. Technological means for simplification and mechanization of preparation of cellular suspension and also for large-scale cultivation of the continuous cell cultures in a monolayer are presented in this article. The offered devices are intended for laboratory or for industrial use as a part of technology park for the solution of tasks in the field of bionanotechnology.
Application of focused electromagnetic fields in satellite construction processes and fault diagnostics
Authors: Testoyedov N A , Romanov A G , Danilov I Yu , Sedel’nikov Yu E , Veden’kin D A
Published: December 2019

Near field focused antenna properties most relevant in terms of their practical application are briefly presented. The process and diagnostic applications already implemented as satellite construction practices at Academician M.F. Reshetnev Information Satellite Systems as well as their promising applications are considered.
Transversely modulated wave packet
Authors: Salomatov V N
Published: December 2019

The wave packet consisting of two harmonic plane waves with the same frequencies, but with different wave vectors is considered. The dispersion relation of a packet is structurally similar to the dispersion relation of a relativistic particle with a nonzero rest mass. The possibilities of controlling the group velocity of a quasi-monochromatic wave packet by varying the angle between the wave vectors of its constituent waves and of creating a one-dimensional spatial structure in the region of wave packet propagation are discussed. The interaction of two transversely modulated wave packets is considered.
On the controllability of a quantum object
Authors: Valishin Nail T
Published: December 2019

On the basis of the V-function method, the physical statement of controllability as a wave motion of an object to a new state is carried out. It follows from the V-function method that the wave motion of an object is inextricably linked with its trajectory. It is shown that controllability as an object leaves the state occurs in the direction of the gradient of the wave function.
Comparative analysis of cats’ lymphocytes structural features with and without retroviral infection using atomic force microscopy
Authors: Krasnikova E S , Artemev D A , Krasnikov A V , Stolbovskaya O V , Kostishko B B
Published: December 2019

The results of the comparative analysis of morphometric and elastic parameters of the fixed lymphocytes from intact and infected with viral immunodeficiency and leukemia cats using atomic force microscopy are presented. It is found that the adhesive properties and the roughness of the cell surface of cats’ lymphocytes with FeLV and FeLV - FIV infection are reduced by 27 – 45 % and 19 – 32 %, respectively. These indicators in the lymphocytes of FIV infected cats did not significantly differ from the intact cats’ lymphocytes. An increase in the Young’s modulus of lymphocytes in cats with retroviral infection of 9 - 16 % compared to the control has been shown. It is found that lymphocytes from cats with retroviral infection are characterized by a decrease in volume at 36 - 77 % compared to the control cats’ lymphocytes. Intact animals’ lymphocytes have a domed shape, whereas infected cats’ cells have a greater perimeter and length with reduced height. Peculiarities of blood lymphocytes in FIV, FeLV and FeLV - FIV infected cats can be important in the study of immunological mechanisms in the retrovirus pathogenesis.
Electrical switching in metal-oxide-metal structures based on anodic niobium oxide
Authors: Pergament A L , Boriskov P P
Published: December 2019

Nonlinear current-voltage (I–V) characteristics with S-type negative differential resistance, as a characteristic feature of the switching effect, are inherent in a variety of transition metal oxides, niobium oxide included. Although this phenomenon has been known for a long time, recent proposals to use oxide-based switching devices as elements of oscillatory neural networks have resumed the interest in this area. In this work, electrical switching in sandwich structures based on anodic films of niobium oxide is studied. After being electroformed, these structures exhibit S-shaped I–V characteristics. As the temperature increases, the threshold voltage decreases, presumably tending to zero at a critical temperature T
0, which correlates with the temperature of metal–insulator phase transition of niobium dioxide. Channels consisting of NbO2 are formed in the initial anodic films during the process of electroforming.
On the wave-particle duality within the framework of modeling single-photon interference
Authors: Davydov A P , Zlydneva T P
Published: December 2019

The general results of constructing and modeling the photon wave function in the coordinate representation in the framework of quantum mechanics are presented in order to explain single-photon interference phenomena, in particular Young’s experiment. The relevance of this function is emphasized in connection with modern single-photon and two-photon experiments. The necessity of replacing the explanation of obtaining coherent light sources using the concept of a train of supposedly real electromagnetic waves emitted by one atom, by the conditional emission by this atom of the photon wave function in the coordinate representation, which then experiences diffraction and interference, is substantiated. A single-photon wave function is simulated based on the consideration of the electric dipole radiation of an atom in classical electrodynamics, and a conclusion is drawn on the possibility to explain Young’s experiment. It is argued that although the photon wave function (as well as of particles having mass) is not a physical object, the application of this function significantly weakens the problem of wave-particle duality of light. It is assumed the “nature” of this function reflects the properties of a physical vacuum, but new experiments are required to clarify it.
Registration of the optical output signal of distributed mechanoluminescent impulse pressure sensors
Authors: Tatmyshevskiy K V , Pavlov D D
Published: December 2019

Distributed mechanoluminescent pulse pressure sensors are described in the article. The definition of mechanoluminescent sensors is given, early studies of this phenomenon and their results are also mentioned. On the basis of these studies, a mathematical model of transformation in a distributed mechanoluminescent sensor is constructed. The substantiation of the choice of a mechanophosphor for experimental studies is given. The design of a distributed mechanoluminescent sensor is described, a laboratory bench is developed and assembled. The article describes experiments to obtain and register the glow of the sensor. Conclusions are made about the results of studies and the possible use of this type of sensors.
Graphene polymorphs
Authors: Belenkov M E , Kochengin A E , Chernov V M , Belenkov E A
Published: December 2019

Ab initio calculations of twelve structural varieties of graphene were carried out using the density functional theory method. The structure of non-hexogonal graphene species contains topological defects 4, 5, 7, 8, 10, or 12, which deform the layers. The sublimation energy of graphene polymorphs decreases with increasing degree of layer structure deformation compared to hexagonal graphene. In the electronic structure of graphene layers L4-12 and L4-6-8e at the Fermi level, there are band gaps 0.59 and 0.37 eV wide, so these layers must be semiconductors.
Low-noise hybrid frequency synthesizers for 5G technology
Authors: Romashov V V , Yakimenko K A , Doktorov A N
Published: December 2019

This paper presents the results of structural design and analysis of the noise characteristics of a low-noise hybrid frequency synthesizer based on direct digital and indirect synthesis methods for using as a shaper of harmonic signals for fifth generation telecommunication systems transceivers. The hybrid synthesizer is based on a phase-locked loop (PLL) with DDS operating on fundamental frequency images. Due to this, the hybrid synthesizer generates a wide range of output frequencies with high frequency resolution, as well as a low level of phase noise and discrete side components of the spectrum of the output signal.
Magnetic nanoconstructions of iron oxides coated with arabinogalactan functionalized with DNA aptamer
Authors: Stolyar S V , Chekanova L A , Yaroslavtsev R N , Komogortsev S V , Gerasimova Yu V , Bayukov O A , Volochaev M N , Iskhakov R S , Garanzha I V , Kolovskaya O S , Bairmani M Sh , Zamay T N
Published: December 2019

New composite nanoparticles for biomedical applications have been manufactured. The particles consist of an anisomeric magnetite core coated with arabinogalactan and are functionalized with cameras for As-14 ascites cells (Ehrlich carcinoma). The binding of ascitic Ehrlich carcinoma cells to magnetic nanoparticles was evaluated using fluorescence microscopy.
The comparative analysis of the solid-state 31P NMR spectra of Re-Pt vinylidene complexes
Authors: Smolyarov K T , Volkov N V , Matsulev A N , Kondrasenko A A
Published: December 2019

The two vinylidene complexes Cp(CO)2 RePt(μ-C=CHPh)(PPh3 )(CO) and Cp(CO)2 RePt(μ-C=CHPh)(PPh3 )2
and their precursors PPh3
and P(PPh3 )4
were studied by solid-state nuclear magnetic resonance. We analysed 31P cross-polarization spectra acquired in static conditions and with magic angle spinning. The chemical shift tensors of each sample were determined by fitting their spectra using SIMPSON simulations.
Effect of nanoparticles in growth of test - bacteria
Authors: Stolyar SV , Chekanova LA , Yaroslavtsev RN , Ladygina VP , Tirranen LS
Published: December 2019

Confident effect of five magnetic composite nanoparticles (FeP@Ag, FeP@Pd, CoP, NiP, Fe2O3@AГ) on growth of test bacteria colonies (Acinetobacter baumannii, Еscherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Staphylococcus aureus) in five replicates each is considered. Reliable inhibitors of colonies of all five test bacteria were nanoparticles FeP@Ag. CoP nanoparticles are reliable inhibitors of growth of 4 test bacteria (except for test bacteria Escherichia сoli). NiP nanoparticles are reliable inhibitors of growth of 2 test bacteria: Escherichia сoli and Klebsiella pneumoniae. Bacteria Escherichia сoli were most sensitive to the effect of magnetic nanoparticles; and bacteria Pseudomonas aeruginosa and Staphylococcus aureus were most resistant to the effect of magnetic nanoparticles. The prospects of the method are in the possibility of multiple reuse of the magnetic particles with antimicrobial properties for bacterial decontamination of the studied sources of water and removal of magnetic nanoparticles from the treated liquids by electromagnet. The method can find use in water treatment facilities for household, Industrial and medical wastes.
Modeling the temperature distribution of multi-chip integrated circuits combining Wire-Bond and Flip-Chip technologies
Authors: Boriskov P P , Ershova N Yu , Putrolaynen V V , Seredov P N , Belyaev M A
Published: December 2019

On the basis of finite-element computer modeling, the temperature distribution of a multi-chip integrated circuit was calculated in System on Package configuration, combining Wire-Bond and Flip-Chip technologies. Technical recommendations are suggested for choosing a compound, taking into account the continuous layer of the compound separating the active elements and the heat sink.
Morphophysiological changes in the intact surface of rat skin under the application of silicon and gold nanoparticles
Authors: Kondratenko E I , Lomteva N A , Timoshenko V Yu , Alykova A F , Kasimova S K , Zavestovskaya I N , Yakovenkova L A
Published: December 2019

The effect of a course application of suspension of porous silicon and gold nanoparticles on the skin of female rats on the level of free radical oxidation and catalase activity in the skin homogenate was studied. MesoPSi samples were formed using the standard method of electrochemical etching of p-type c-Si wafers with a surface orientation of (100) and a specific resistance of 1-5 mOm x cm in a solution of hydrofluoric acid and ethanol (HF (50%): C2H5OH = 1: 1) at an etching current density of 60 mA / cm2 for 1 hour (45 minutes-hour). After this, mesoPSi films were separated from the silicon substrate by a short-term increase in the current density to 600 mA / cm2. Aqueous suspensions of porous silicon nanoparticles with sizes of the order of 100 nm were obtained by mechanical grinding of mesoporous silicon films in water. Aqueous suspensions of gold nanoparticles with an average size of 30-50 nm were obtained by laser ablation of gold targets in deionized water. A suspension of silicon and gold nanoparticles in physiological saline at a concentration of 0.2 mg / ml was applied once a day in the form of a thin layer on a shaved area of the skin of animals (interscapular region) and left to dry completely. Applications were carried out for 10 days. The studied silicon and gold nanoparticles did not change the initial content of malondialdehyde and catalase activity in the skin tissue but contributed to the activation of the rate of spontaneous lipid peroxidation.
Quadratic cosine-Gauss beams – the new family of localized solutions of the paraxial wave equation
Authors: Plachenov A B , Dyakova G N
Published: December 2019

We propose a new class of localized solutions of the paraxial wave equation. They have a form of a product of a Gaussian term and an amplitude which contains only elementary coordinate functions. Solutions are obtained by summing of the quadratic Bessel–Gauss beams with odd indices. Due to the configuration of the obtained solutions, we named them quadratic cosine-Gauss beams.
Realization of an educational tool dedicated to teaching the fundamental principles of photovoltaic systems
Authors: Hassouni Bennacer El , Haddi Ali , Chekenbah Hamid , Amrani Abdellatif G , Ikonnikov O A , Danichev A A , Tsarev R Y
Published: December 2019

This article describes a low-cost educational tool dedicated to teaching basic knowledge of solar energy and photovoltaic applications for first-year students at the poly disciplinary faculty of Larache. This experimental teaching method allows students to concretize all the achievements of the theory and the results obtained during the simulations of the PV systems on a simulation tool, so, it’s an opportunity of sensitization and integration of the students in a world in full change towards a purely green system. The realized system is simple to use, robust, easy on the move, economical and not spacious. It offers students the opportunity to acquire the fundamentals of photovoltaic energy. Several models of practical work are developed to give an overview of the learning exercises that could be done by students to discover the multiple applications of photovoltaics. For example, many cases of study can be treated such as the electrical characterization of PV panels with different technologies, the effect of irradiation and temperature, the effect of shading, the effect the inclination and orientation and finally the calculation of the efficiency of the PV panel.
Radiopulse generation in dispersive nonlinear transmission lines with gas dischargers
Authors: Priputnev P V , Romanchenko I V , Rostov V V
Published: December 2019

The problem of excitation of high-frequency oscillations in a transmission line with gas dischargers is considered. The main patterns of the generation of radio pulses during the propagation of a shock electromagnetic wave in lines with dispersion and gas dischargers are revealed. The conditions for the most efficient conversion of energy of a video pulse into energy of a radio pulse are found.
Modeling of nonlinear shock deformation of passenger car bodies with emergency exits
Authors: Shorokhov S G , Bondarenko O I , Lebedev V A
Published: December 2019

Original design solutions for passenger car bodies equipped with emergency exits have been proposed. The operability and safety of the proposed structures is evaluated based on the modeling of the load bearing structures in emergency situations. Two options for the development of an emergency are considered: a collision with a car on a level crossing and rollover. The analysis of loading was performed by the finite element method in a dynamic nonlinear formulation. The finite element models of the supporting structures of the bodies of passenger cars with evacuation exits and without them have been developed. Model verification was performed by field bench tests. The dynamic loading was estimated in a dynamic setting by the explicit integration method based on the central difference method with keeping the accelerations constant within the step and quadratic approximation of the displacement vector for three consecutive moments of time. The data obtained as a result of the study on the stress-strain state of the supporting structure indicate the operability and safety of the proposed solutions. A variant of the body structure of a double-decker car is protected by a patent for a utility model.
The processes of hydrocarbon conversion using catalytic systems
Authors: Kuzhaeva A A , Dzhevaga N V , Berlinskii I V
Published: December 2019

This article describes properties of the catalytic conversion of methane to synthesis gas, makes a review of information on the chemical composition of catalysts and provides assumptions about the mechanism of their action. The facts and generalizations given in the article can be useful in determining ways to improve catalytic systems. The most active and most selective catalytic systems make it possible to optimize existing processes by cutting down energy consumption, cost, emissions and increasing the yield of a valuable product. Increasing the depth of conversion and the integrated use of raw materials, as well as ensuring the environmental cleanliness of the technological processes of processing is achieved by using highly efficient catalysts. With the help of highly efficient catalysts it is probable to increase the depth of conversion, the integrated use of raw materials as well as ensuring the environmental cleanliness of the technological processes of its processing.
Construction of standard aircraft turns in relation to the return point to the path line
Authors: Markelov V V
Published: December 2019

The trend of development of modern on-board aircraft systems causes the emergence of new requirements, in particular, to maintain the specified accuracy characteristics while the air navigation. One of these requirements is the implementation of reverse flight schemes, which include standard turns and final turns with the control of the exit to the line of a given path with the return course. Taking into account the fact that the reverse schemes do not solve the problem of providing an exit to the line of a given path at a given control point. The method of using alternative reverse schemes is proposed to solve the problem of ensuring the end of the reversal in the reverse schemes at a given point. The given point of the exit on the path line with the return course is applied as a reference control point in these schemes. The presented method provides the construction of standard turns in relation to the point of return to the path line. The method is used in the preparation of schemes of turns and is used by the onboard aircraft navigation system when flying according to these schemes. The method allows to ensure the end of the turn with the exit to the line of a given path at a given point, as well as to reduce the area of the protected space of the turn zone.
Automation of design for dynamic loading at the designing stage of mining machinery
Authors: Velikanov V S , Dyorina N V , Suslov N M , Luntsova A I , Rabina E I
Published: December 2019

Meeting the growing needs of the state’s economy for the raw materials needed for the production of ferrous and non-ferrous metals accelerates the technical re-equipment of the mining industry through the introduction of new, more powerful equipment. This circumstance determines the urgency in the automation of calculations at the design stage of mining machines. The originality of the developed software product is in consideration of the actual loads acting in the working equipment of a career excavator. Actual dynamic loads significantly exceed their calculated values, which leads to an increased number of structural element failures. At the design stage, with the use of the developed program, it is possible to establish rational cross-sectional dimensions of the handle metalwork taking into account the actual loads arising during the rock mass excavation and stress concentrators.
Calculation of reliability of information symbols in perforated codes
Authors: Sidorenko Alexander A
Published: December 2019

Turbo-codes came closest to Shannon’s limit. One of the important steps in the operation of a turbo-code decoder is to calculate the reliability of information symbols. The article describes in detail the process of calculating the reliability of information symbols in accordance with the SOVA algorithm for convolutional code with perforation of code bits and without perforation. For a specific example of a received code sequence containing an error, numerical calculations of the reliability of information symbols for a convolutional code with perforation of code bits and without perforation are performed. The results are compared.
Analysis of reliability of the machine building enterprise supply chains based on information and computer technologies
Authors: Golubeva S S , Golubnichenko M V
Published: December 2019

The article considers the reliability of supply chains based on information and computer technologies. The systems of supply chain management and the methods of reengineering business processes are analysed. The approbation of the methodology of structural analysis and design is given on the example of a well-known engineering company in Saratov.
The choice substantiation method of road construction equipment for mining enterprises
Authors: Afanasyev A S , Egoshin A M , Alekseev S V
Published: December 2019

Selection of types and brands of road construction equipment for building quarry roads inside mining enterprises is an important task in a free market. In this case, the main criterion is the minimization of costs, which depend on the rational distribution of equipment among the work objects. Such a rational distribution is proposed in this technique, taking into account the operating conditions of the equipment.
Multi-agent modeling of the learning process using nested colored Petri nets
Authors: Gorbachenko I M
Published: December 2019

A model of the educational process of the university in the form of a two-level multi-agent system is implemented in the form of an embedded colored Petri nets using the CPN Tools software. The system allows a statistical modeling of the development of the educational program as a single student or group of students by evaluating the success of training. The average grade point and dropout rate are assessed both for passing one academic subject and the entire educational program. The initial data for modeling are taken on the basis of the experience of teaching students with a close profile of training and expert assessments of specialists. The structure of the system and the functioning of Petri nets are considered. An example is given illustrating the operation of the system.
Formation the management methodology for developing an export potential of the EAEU machine-building enterprises
Authors: Belyakova Galina , Belyakov Sergey , Fokina Darya , Shpak Anastasiya
Published: December 2019

This paper considers the necessity to form a method of the develop of an export potential of machine building companies in the EAEU conditions. A new production processes model, the so-called digital manufacturing, offers enterprises a wide range of modified tools for stimulation of an export potential. The research focused on formation of the method of the developing of an export potential among machine builders, and the studding tasks and main stages of the management of an export potential. New method should take into account not only the trends and socio-economic level of development of states with different living and economic conditions, but also the specifics of machine-building enterprises and the features of their products.
Individual components for combined heat and power distillation to produce electricity
Authors: Bamatov Ibragim M , Bamatov Dzhabrail M
Published: December 2019

This paper work is illustration of energy management and consumption, different types of steam turbine cogeneration system. Moreover, this research schematically illustrates the work principle of combined heat and power distillation process, which gives the best environmental effect for the reduction of carbon dioxide (CO2) gases that effects in water prices and yields pure water from the extraction process.
Stochastic modeling of a technological process using histogram computation
Authors: Guzha E D , Khvostova T V , Romanenko V A , Skorokhod M A
Published: December 2019

The focus of research is a discrete-event simulation model of the production process, including many technological operations, the time duration of which should be considered as a random function of several discrete variables. It is assumed that a limited amount of available statistics allows us to construct estimating distribution functions of the random function concerned only for individual values of its arguments. The estimates obtained in this way are suggested in order to be used to form the estimating distribution functions of the random function for any values of its arguments by the methods of histogram arithmetic. Results of the use of the proposed approach, implemented within a computer simulation model of a transport technological process are considered.
The mechanism for the generalized dual problem of network programming solving
Authors: Zimin A V , Burkova I V , Kravets O Ja , Zimin V V
Published: December 2019

The generalized dual problem (GDP) is formulated as a search task of the upper bound minimum (lower bound maximum) for the optimum obtained by solving discrete linear and nonlinear problems by the network programming method. The need for GDP solution arises when, in order to meet the applicability conditions of the method, the right side of the constraint is divided into several unknown summands. The GDP consists in finding of such a partition that ensures achievement of corresponding minimum (maximum). There is no evidence for an existence of the GDP solution for today. However, the conditions for the GDP optimum solution have been formulated. The article proposes an iterative mechanism for search solution of the generalized dual problem. This mechanism is based on the software implementation of the procedure for solving the optimization problem by means of network programming. The application of the mechanism is illustrated on the developing competences task of IT services users. It was shown that the GDP solution exists and is not the only one.
Solving the problem of the evolutionary tasks of economics and organization of production in spatial networks
Authors: Borisoglebskaya L N , Provotorov V V , Pilipenko O V , Kravets O Ja
Published: December 2019

The complex structure of modern production involves the development of innovative algorithms for servers control. It is necessary to take into account the structure and organization of the enterprise for a long planning horizon. In addition to the intellectual processing of data about the external environment, economic calculation is required. Currently the ways used for solving problems by methods of mathematical programming are insufficient, since production and commerce over the past decades have been combined into branched transnational networks. In this paper, an approximation approach to the analysis of evolutionary problems is proposed. The modeling of industrial-commercial networks using graph theory is applied. Spatial variables that strike the entire spectrum of indicators of the current activity of the enterprise have been introduced.
Using Google TensorFlow Machine Learning Library for speech recognition
Authors: Medvedev M S , Okuntsev Y V
Published: December 2019

This work is devoted to the development and study of the procedural processing of speech signals using recurrent neural networks. Our method for speech recognition was a connectionist temporal classification based on networks of long short-term memory. The main goal of this work was to study the specifics of the Russian language, to develop methods and algorithms for converting oral speech into text based on artificial neural networks. The final recognition coefficient is about 62%.
Information openness in the sphere of environment protection as a factor of sustainability of machine-building companies
Authors: Akhmetshina A A , Galimullina N M , Korshunova O N , Malysheva E V , Feoktistova I R
Published: December 2019

The research is devoted to the issues of information openness of machine-building companies in the sphere of environment protection. The contemporary state of environmental legal awareness calls for the need to consciously opt for environmentally-effective enterprises, which refers equally to consumers, investors, partners, and governmental bodies. The research objective is to reveal the contemporary state of disclosing environment information in enterprises’ open sources. To achieve the set goal, 14 leading machine-building companies were selected and their annual reports were studied as public sources of the company information. The comparative analysis of empirical documents allowed identifying the best practices in the sphere of disclosing environmental information by the Russian machine-building sector.
Digitalization of organizations: current issues, managerial challenges and socio-economic risks
Authors: Ivanova I A , Pulyaeva V N , Vlasenko L V , Gibadullin A A , Sadriddinov M I
Published: December 2019

The article explores issues related to the transition of modern organizations to digital technology. It is planned that by 2036 about 50% of jobs will be automated and, as a result, this will lead to a transformation of the labor market and a change in the socio-economic situation in the regions and in the country as a whole. The study provides data on the high degree of computerization of modern Russian organizations, which actually increases the overall involvement of staff in the organization’s activities and business efficiency. In order to effectively transition to digital technologies, modern organizations must adapt to changing conditions and conduct organizational training. The study suggested that in the digital era, it is necessary to use public-private partnership mechanisms that will allow the formation of knowledge bases in conjunction with educational and scientific institutions and business structures, which will quickly adapt to changing conditions and maintain a holistic organizational system of enterprises. At the end of the work, conclusions are drawn from the results of the study.
The method for assessing security of embedded software based on the fuzzy logic
Authors: Iuganson Andrei , Zakoldaev Danil
Published: December 2019

Software occupies a key role in all information processes of society. Frequently, questions of software security are pushed into the background when designing and developing software for the quickest launch of a software product on the market. In this paper we have tried to explore some innovative measures and proposed a new approach for assessing software security. The subject of research is embedded software designed to control various devices and microcontrollers. The fuzzy logic was used to optimize the process of assessing in conditions of possible vagueness, inconsistency, incompleteness and qualitative nature of the initial information. This method will help to minimize economic risks on stages of exploitation and technical maintenance of embedded systems.
On the possibility of scientific knowledge formalization by fuzzy logic methods
Authors: Serov Vladimir V
Published: December 2019

The issues of formalizing scientific information by fuzzy logic methods are considered. The object of study is the generally accepted theory and knowledge; in our case it will be molecular spectroscopy. The method will be applied calculus of fuzzy first-order predicates. Examples of formalizing knowledge from the field of IR spectroscopy are given, as well as methods for solving problems of a qualitative nature (interpretation, prediction, identification) with an assessment of the truth of the results. The possibility of using these methods for the development of expert and intelligent systems in various subject areas is shown.
Digital support of production small business preparation in engineering
Authors: Bulavin V F , Bulavina T G , Yahrichev V V , Stepanov A S , Frolov A A
Published: December 2019

The article summarizes the experience of adapting Russian CAD systems in the working conditions of small enterprises in the engineering sector. Computer-aided design combines the following stages: design, technological and engineering analysis. Each of the sections acts as an independent one, but the transition to the next step is completely based on the previous one. Adaptation of CAD packages in small enterprises includes filling in databases on completed projects, parts, components and components of the engineering sector, the distribution of access rights, the creation of working archives, as well as the available equipment and accessories.
Identification of the local area network using machine learning
Authors: Voronin I V , Gazin A I , Ziyautdinov V S , Zolotareva T A , Skudnev D M , Selishchev O V
Published: December 2019

This article discusses the use of a network traffic analyzer based on a neural network to detect and resolve problems that occur in local area networks. Several packet capture approaches have been investigated that affect the speed and accuracy of network traffic analysis. Various methods for classifying network traffic are given, special attention is paid to the machine learning method. The main advantages and disadvantages of various teaching methods have been identified. The process and basic steps of clustering the training set are described. As a result of the study, a method was identified for creating a high-quality system that allows identifying the state of a local area network.
Simulation of artificial intelligence in a computer game
Authors: Soboleva Elena V , Shalaginova Nadezda V
Published: December 2019

Artificial intelligence, implemented in the space of a computer game, will allow performing a variety of practice-oriented tasks and time-consuming algorithms: finding ways, avoiding obstacles, conducting combat, choosing the appropriate strategy, simulating emotions, dialogue, etc. The main problem that should be solved when developing an appropriate gaming application is to simulate the mechanism for controlling all possible functions of the game object. The research methodology includes: analysis of scientific works of Russian and foreign authors; the method of system information analysis, the method of mathematical and information modeling; computer experiment method, as a kind of computational; decision making algorithms. The paper presents a solution to the problem, including the informed choice of a decision-making algorithm, and the design of a model of a fuzzy finite automaton that combines the advantages of a model of a generating finite automaton and fuzzy logic. Based on the results of testing the implemented model, a conclusion was formulated about the main advantage of the artificial intelligence model for the gaming application - its ability to make an unusual decision in the arisen game situation.