bluuebunny/crossref_metadata_2025_split huggingface dataset:
Time and phase synchronization in communication system with a digital pseudo-random modulation
Authors: Kokin D S , Ponomarev O G 
Published: November 2020

Abstract
The paper is concerned a model of a digital communication system where the samples of white Gaussian noise with zero mean and dispersion σ2are used as a modulated (carrier) low-frequency signal. Methods of the digital-phase modulation are used in a system for transmission of information message. The communication technology reminds CDMA (Code Division Multiple Access). However, a key of feature of this system is that digital samples of white Gaussian noise are used to increase the spectrum of the information message instead of traditional Walsh-Hadamard binary sequences. In this system the repeat period of the pseudo-random sequence values is specified by the parameter and can be equal to the time (duration) of several information symbols contrast to CDMA, in which the duration of repetition period equals to the duration of modulating symbol. On the one hand, the solution allows you to increase the confidentiality of the transmitted message and more evenly expand its frequency spectrum as compared with the existing of CDMA methods. On the other hand, scientists face two significant scientific tasks that make the work meaningful. First, it is necessary to ensure the synchronous operation of pseudo-random sequence generators in the receiving and transmitting devices. Secondly, it is necessary to define a phase shift amount of the frequency-change oscillator in receiving device. Both problems are the result of the asynchronous starting of the receiver. A control signal is used to solve these problems in the radio communication system which is transmitted simultaneously with an information message. So the result of modulator work is the sum of both information and control modulated signals. The proposed methods and algorithms provide the coherent signal processing with the digital pseudorandom modulation in the receive path of communication channel. The paper is a course of early research studies and it contains a detailed mathematical description of modulation and demodulation signals in the communication system with the digital pseudorandom modulation. The numerical model of the system is described in MatLab language. All numerical experiments were carryout in a mathematical computing system of MatLab.
Wave formation in a two-layer band of liquid from a source located in the lower layer
Authors: Mikishanina E A 
Published: November 2020

Abstract
The article is devoted to the construction of an analytical algorithm for solving the problem of wave formation in a two-layer liquid from a source located in the lower layer of the liquid. In the process of solving the problem, it is reduced to a boundary value problem for a system of differential equations with respect to the velocity potentials of the disturbed flow of liquids. Next, the problem is divided into three simpler edge subtasks. Expressions describing the evolution of the free boundary and the separation line of the liquid layers are obtained. This evolution is also represented graphically. Conclusions are made about the influence of the ratio of densities, layer width and source power on the process of wave formation.
Detecting a radio signal with the unknown parameters and inexactly known envelope shape
Authors: Chernoyarov O V , Dachian S , Korchagin Y E , Trifonov M V , Shepelev D N 
Published: November 2020

Abstract
The new quasi-likelihood algorithm is considered for detecting a radio signal with the unknown amplitude, duration, initial phase and inexactly known envelope shape against Gaussian white noise. The structure and the statistical characteristics of the introduced detection algorithm are found. The influence is studied of the difference in the envelope shapes of the received and reference signals upon detection efficiency.
Automatic control of working car engine vibrations using multi-stage discrete Fourier transformation
Authors: Burova A Yu , Kabakov V V 
Published: November 2020

Abstract
There are questions connected with work of automotive internal combustion engines quality control digitalization. The research goal is formalization of necessary and enough condition of automatic control of such engines’ vibration levels by discrete Fourier transformation digital methods without completing hardware-intensive multiplication operations. During research there are used methods of mathematic and hardware-intensive modeling of digital algorithms of discrete Fourier transformation work and differential filtration on programmed logical integral devices. There are principals of this engine vibrations’ level by digital methods of multi-stage discrete Fourier transformation, which does not require completing algorithmic multiplication operations. There are given formulas of such digital signals’ transformation of differential digital filters by only algebraic addition of timing counts of these signals. The research results have shown and confirmed a possibility of lowering hardware costs with hardware and software realization of digital algorithms of working automotive internal combustion engine vibrations on programmed logical integral devices.
Scattering matrix simulation of the volumetric strip-slot transition and estimation of its frequency properties
Authors: Fomin D G , Dudarev N V , Darovskikh S N 
Published: November 2020

Abstract
The main lines in the development of wireless communication technologies are their microminiaturization, expanding the functionality of their built-in devices, and fastening the data exchange between the components of radio engineering complexes. In this case, one of the relevant issues is the development of frequency-selective devices operating in the microwave frequency range. A promising line for the creation of such devices is their integrated design based on a volumetric strip-slot transition. This article presents theoretical and experimental research of the s-parameters of the volumetric strip-slot transition. The frequency-selective properties of the volumetric strip-slot transition were estimated based on the obtained dependences of the s-parameters. The theoretical results were obtained by creating a matrix mathematical model, by designing an equivalent circuit in a circuit-simulation program, and by the numerical simulation based on solving a boundary value problem in a strict diffraction statement, using direct numerical methods. The experimental results were obtained using a sample of the volumetric strip-slot transition. The presented results of the three types of simulation and the experimental results are in good numerical relation to each other.
New approaches for modelling vortex flow meters
Authors: Dayev Zhanat , Kairakbaev Aiat , Duzheva Alexandra , Sultanov Nail 
Published: November 2020

Abstract
The paper proposes a new model of a vortex flow meter, which is developed on the basis of modification of the basic equations of incompressible fluid hydrodynamics. The article deals with the modification of the Euler equation and the continuity equation of the flow. In this paper, dependencies are obtained for estimating the final standard uncertainty of flow rate using a vortex transducer. A detailed analysis of the influence of incompressible fluid flow parameters and the geometric dimensions of the vortex transducer on the final uncertainty of flow rate is performed. Recommendations are given for improving the method of flow rate using vortex transducers.
Spatial-frequency characteristics of photo matrices for colour image
Authors: Solomatin V A , Parvulyusov Yu B , Zhbanova V L 
Published: November 2020

Abstract
The paper presents a spatial-frequency characteristics comparative analysis for obtaining a colour’s image several methods. The modern colour image matrix spatial-frequency characteristics photodetectors spatial-frequency characteristics are presented. Both unique and advanced matrix photodetectors of both multilayer type and standard systems with mosaic filters are being investigated. The author’s matrix photodetector input signal distortion estimation, where two-layer sensors are presented, is carried out. Spatial-frequency characteristics comparative analysis showed that three-matrix colour image systems provide the best spatial resolution and the highest spatial (contrast) sensitivity than mosaic-type photodetectors.
Modeling and computer-aided design of combustion chambers for aircraft engines and gas turbine plants using an expert system
Authors: Kishalov A E , Lipatov V D , Soloviev P V 
Published: November 2020

Abstract
The modeling issues of the working process and the design of combustion chambers for aircraft engines and gas turbines are considered. The developed modeling tool is shown: the “AM” expert decision-making system. A brief description of the expert system and module aimed at modeling and designing of the combustion chamber structures is given. The results of the computer-aided design of combustion chambers for the AL-31F aircraft engine and the AL-31ST gas turbine engine are presented. The results obtained are verified on the basis of the basic design and the values obtained using three-dimensional models of the real structure. A comparison of materials selected by an expert system with those used in a real design is performed. The parametric studies results of the various parameters influence of the combustion chambers working process on their design are also shown.
Fiber-optic rudder position sensor for unmanned vessels
Authors: Sedova N , Sedov V , Bazhenov R , Povkh I , Alekseeva L , Korosteleva I 
Published: November 2020

Abstract
The paper presents the results of a study on the design of the rudder position sensor of a steering vessel, in which an optic fiber is a sensitive element and a data transmission line. A design of a sensitive element based on the effect of bending modulation of light transmission of an optic fiber is proposed, and a mathematical expression is obtained in ray equivalence, which describes the behavior of the sensitive element. The prototypes of the sensitive element and the laboratory setup have been developed, numerical modeling has been carried out, and experimental results have been obtained showing the potential use of the proposed approach for this class of problems.
Quantisation of angular momenta in atoms
Authors: Bamatov D M , Bamatov I M , Arsanov M M 
Published: November 2020

Abstract
The aim of the work was to see if the direction of angular momenta in atoms is quantised. In order to do it, a beam of atoms is split, and deflected because of interactions between atomic dipole moments and an externally applied magnetic field. In which case, the angular momenta in atoms is definitively quantised. Firstly, the detector was checked and then the operation of the detector was characterised; secondly, the beam was detected and characterised with residual magnetisation minimised; thirdly, the beam was detected and characterised with magnetic field present. The sample used to determine the magnetic moment was Potassium. The Bohr’s magneton constant value was found to be (9.22±0.7)*10−24 J/T. The answer is lower than the nominal value but lies within the expected error range. This proved the accuracy of the work done and proved the quantisation of the angular momentum, since it proved the presence of magnetic moment.
C-Ag+−C based repetitive DNA sequence
Authors: Popova M A , Rolich V I , Ramazanov R R , Kasyanenko N A , Sokolov P A 
Published: November 2020

Abstract
DNA is a convenient and well-studied tool for nanostructures fabrication. Metal-mediated hybridization of DNA strands opens up new possibilities for nanobiotechnology. In this work, we studied the possibility of long DNA formation from short ones by gluing them through the formation of C-Ag+−C complexes. Such long formations were investigated using static light scattering and atomic force microscopy. It was found that the duplexes can efficiently be linked in the presence of silver ions if the length of the cytosine sequence exceeds 6 nucleobases.
Technology of functional elements of electronics based on nanotubes and graphene
Authors: Simunin M M 
Published: November 2020

Abstract
The state of the field of technologies for the synthesis of carbon nanotubes today allows the production of large volumes of nanotubes with desired properties, however, issues related to their application, as a rule, face difficulties that often require the process to be specialized. This work can help to form approaches to solving possible difficulties in the methods of using carbon nanotubes. The presented technological concept makes it possible to obtain both carbon nanotubes and graphene in a single-type installation from different carbon-containing sources. Using the oxidation of a carbon source, reduce the temperature of synthesis from it to the temperatures of synthesis from carbon monoxide, as well as get rid of excess amorphous phases formed during pyrolysis. Finally, it is precisely the positioning of the catalyst in the right places, without the possibility of its surface diffusion and evaporation, which will make it possible to obtain functional elements based on carbon nanotubes or graphene in these regions.
Galvanization and burning teeth root pulpa by means of iodine electrophoresis
Authors: Jalilov M Kh , Khudaykulova Sh N , Burkhonov B N , Akhrorov M N , Temirov F N , Ergashev A J 
Published: November 2020

Abstract
This article is devoted to the study of the treatment and administration of the drug through the skin and mucous membranes into the body under the action of direct current. It is indicated that the method depends on the specific resistance of organs and tissues. The numerical values of the specific resistance of some organs and tissues are given. The article is divided into two parts. The first section provides a brief overview of galvanization, electrophoresis of drugs and dissociation of drugs. The second part describes the methods of treatment of tooth pulp using electrophoresis which are now common. Iodine electrophoresis has been shown to be used for the treatment of acute and chronic pulpids passing through narrow or impenetrable, straight and crooked canals of single and multi-rooted teeth. The topic can be of interest to masters and dentists studying dentistry at medical institutes.
Modification of polished silicon under exposure to radiation of nanosecond ultraviolet laser
Authors: Malinskiy T V , Mikolutskiy S I , Rogalin V E , Khomich Yu V , Yamshchikov V A , Kaplunov I A , Ivanova A I 
Published: November 2020

Abstract
The polished surface of monocrystalline silicon was exposed to radiation of nanosecond ultraviolet laser (λ = 355 nm, pulse duration - 10 ns, pulse energy - up to 8 mJ, pulse repetition rate - up to 100 Hz). Then the samples were examined by scanning electron microscopy and multibeam optical profilometry. The optical damage threshold accompanied by the appearance of a plasma torch near the surface and crater formation was 1.2 J/cm2. Microbreakdown centers on processing defects were observed at an energy density more than 0.2 J/cm2. In the range 0.2 - 1.2 J/cm2 traces of surface lifting were observed.
Definition of the NV-center orientations relative to the diamond crystal plane
Authors: Kukin N S , Kargin N I , Korchevaya I O , Muradova A R , Semenov P A , Vasiliev A N 
Published: November 2020

Abstract
We investigate the electron spin resonance of an ensemble of Nitrogen-Vacancy color centers in a bulk diamond crystal obtained by CVD-method. The diamond crystal had 1 ppm concentration of nitrogen. The four possible orientations of the NV-center in the crystal lattice lead to different dependences of a magnitude and an orientation of the external static magnetic field. We used the field of 35 Gauss with the vector in the plane of the crystal. We could rotate it to a certain angle within almost 360 degrees around the normal vector to the plane of the crystal. The goal was to define the unknown orientations of the four axes of the NV-centers relatively to the crystal plane. Experimental results obtained at room temperature with a continuous microwave excitation and presented in this paper are in a good agreement with our simulations.
A combinational full adder based on memristors
Authors: Kulakova A A , Lukyanenko E B 
Published: November 2020

Abstract
A combinational full adder based on memristors is considered. Physical and mathematical models of memristors based on hybrid memristor – CMOS logic are proposed for studying the adder. It is shown that these models can be used for modeling in very large-scale integrated circuits design tools, such as the OrCAD. Unlike physical models, mathematical models of elements do not reflect physical properties, but the parameters of their work correspond to physical models. The work contains textual descriptions of the models. As a result of modeling (computational experiment), flow diagrams of the operation of the adder built on these elements are shown, parameters are given (signal propagation time, power dissipation, number of elements, energy efficiency). The developed models can be used to speed up the process of modeling digital integrated circuits using memristors.
Application of bipolar coordinates to the analysis of the structure of viscous fluid flow between two rotating cylinders
Authors: Kazakova A O 
Published: November 2020

Abstract
The motion of a viscous fluid between two circular rotating cylinders is studied. The transition to the bipolar coordinates is applied to determine the general analytical expressions for stream function. The structure of the stream lines is investigated in the cases when one of the cylinders is motionless and when the both cylinders rotate.
Features of carbon layers synthesis on the porous anodic alumina
Authors: Simunin M M 
Published: November 2020

Abstract
Carbon nanotubes and graphene are two of the most important forms of nanoscale carbon materials. Both materials can be synthesized by CVD method with the use of various “catalysts”. The term “catalyst” is conditional; it refers to a surface, on which graphite islands are formed at a relatively low temperature. Either carbon nanotubes or graphene layers can grow on the surface depending on its shape and physical-chemical properties. As a rule, the materials of such surfaces are the most common metals of auxiliary groups [1], in which the carbon is dissolved after chemical deposition from the gas phase. Then, as a result of supersaturation of carbon solution in metal, the carbon precipitates on the surface in the form of graphite islands, which combine into graphene or nanotubes. However, the ordered carbon structures can be obtained not only by dissolving carbon in metals, but also by using special surfaces, where the surface diffusion of carbon can occur. Aluminum oxide provides an example of such material.
Contactless non-destructive thermal control of materials
Authors: Divin A G , Egorov A S , Ponomarev S V , Al-Busaidi S S , Shishkina G V , Tiurin A I 
Published: November 2020

Abstract
Physical and mathematical models of the heat transfer process in the reviewed control object are considered. On the basis of the formulated boundary value problem of thermal conductivity (using the Laplace and Hankel transformations) the calculated dependences for calculating the desired values of thermal conductivity and thermal diffusivity are obtained. An algorithm for the functioning of the information-measuring and control system for implementing the developed method for measuring the thermophysical properties of materials is presented.
Models and methods of optimization of electricity consumption control in industrial enterprises
Authors: Qarshibaev A I , Narzullaev B Sh , Murodov H Sh 
Published: November 2020

Abstract
This article examines the development of models for determining and regulating the value of active and reactive power based on the analysis of the state of normal operation introduced into the system by the enterprise at the highest loads of consumers. In contrast to the methods existing in practice, when the energy characteristics of consumers of electrical energy exceed the standard values, an optimal method for controlling the modes of consumption of electrical energy is proposed. As an example, the energy characteristics of technological electrical installations of the production workshops of the Navoi Machine-Building Plant are given, in order to control the modes of electricity consumption, to maintain the maximum and minimum values of the active and reactive power of consumers of electrical energy.
Air pollution with oil products in the area of railway tank stops
Authors: Zvyagintseva A V , Samofalova A S , Sazonova S A , Kulneva V V 
Published: November 2020

Abstract
The problems of ensuring safety in the process of fulfilling technical regulations on railway transport at the stop points of tanks with oil products are stated. A basic list of polluting components discharged into the air at the parking of railway tank cars is presented, while priority pollutants are identified. The components that determine the pollution of the railway parking area have been regulated, and the gross emissions have been quantitatively established. The practical implementation of the protection of the air environment of the city of Voronezh is proposed, which implies the removal of stopping points of railway rolling stock, realizing the transit of oil and oil products, outside the residential zone of an industrial city with a million population. This applies to the points of technical stopping of railway tank cars with oil products, both short-term and long-term deployment. It is shown that the inspection and control of specific tank washing points is coordinated by the safety data sheet of the facility itself, which should be included in the category of potentially hazardous facilities.
The neuronet method for pulse wave analysis by hydro-cuff technology at cardiovascular system diagnosis
Authors: Markuleva M V , Gerashchenko M S , Astafyev A N , Voronin S V , Gerashchenko S I , Mitroshin A N 
Published: November 2020

Abstract
The article discusses the application of intelligent neural networks for the diagnosis of diseases. The use of a neural network for the diagnosis of cardiovascular diseases is justified. The advantages and disadvantages of existing methods for analyzing the pulse wave circuit are considered. The increase in the accuracy of calculating the critical points of the pulse wave is justified. To increase the accuracy, a hydro-cuff technology has been proposed, which can significantly increase the amplitude of oscillations caused by pulsation of arteries. A neural network has been developed to detect the characteristic points of pulse signals recorded using hydro-cuff technology. Setting the coefficients of neural network cascade-correlation is performed using iterative Kachmazh’s algorithm. Signal processing was performed in the MatlabR2017b environment.
Digitization, scanning, and reverse engineering technology for creating 3D virtual space
Authors: Veretekhina S V 
Published: November 2020

Abstract
The article describes digital technology. The stages of digitization, scanning, reverse engineering, 3d modeling, prototyping, and rendering are described. The software used is described. The illustrations of the project for rendering a motorcycle are attached. The work is of practical significance. The publication contains links to programming and procedure descriptions. The illustrations show the actual execution of the project. The formation of new physical quantities of a motorcycle is described. The simulation process is shown. New aerodynamic properties of motorcycles are revealed. The purpose of various file storage formats, cloud storage, and prototyping formats is described. The procedures for exporting files are specified. The scientific novelty is the description of the optimal technological process, using a minimum set of software tools, selected file formats, architecture for storing information and technical documentation, including drawings, including drawings and 3d models.