bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of water on impact strength of RTV silicon rubber / Thermosets blend reinforced with nanoparticles
Authors: Farhan A J , Jaffer H I 
Published: May 2020

AbstractBinary and ternary blends of epoxy resin (EP) and unsaturated polyester (UPE) with different weight fractions (0, 3, 5, 7, 10 and 20%) percentages of RTV silicone rubber (SR) were prepared by two different methods. Before that the silicone rubber (SR) was mixed well with sufficient amount of ethanol in one method, and without ethanol in the other method. It was found that the binary and ternary blends specimens that prepared with ethanol was chosen as the best samples have the highest experimental results of impact strength and a good homogeneous dispersion of silicon rubber in the resins as compared with the blends samples that prepared (without ethanol), which were selected to evaluate the lower mixing ratio (LMR) of these blends. The blends with (LMR) were selected and they are going to be considered as a matrix for the nano composite material to be reinforced by Al with 1% wt, and Al2O3with 1% wt nanoparticles to develop the properties of (LMR) blends. Impact test was carried out on the blends with (LMR) and their nanocomposites at different environmental conditions before and after immersion in water for 4 weeks. Also hardness (shore D) test was carried out on the blends with (LMR) and their nanocomposites. The best results of this study befor imarsion in water were achieved with the nanocomposite material consisting of (LMR) binary blend reinforced with Al and (LMR) binary blend reinforced with Al2O3nanoparticles. The results showed that after immersion period of 4 weeks, a decrease in the values of impact strength was observed for the samples of (LMR) binary and ternary blends without reinforcement. It also can be noted that impact strength was increased for the binary blends reinforcement with Al and Al2O3nano particles after 4 weeks of immersion in water. Whereas it can be seen that ternary blends reinforcement with Al and Al2O3nano particles would not achieve similar enhanced in impact strength as that of binary blends reinforcement with Al and Al2O3nano particles after immersion in water.
Assessment of radioactivity levels and its associated radiological Hazards in soil of Kifl city/Iraq
Authors: Farhan Salman Entesser , Ali Shakir Anfal , Shaker Qasim 
Published: May 2020

Abstract
The aim of this study is to measure the natural radioactivity concentration in the soil samples of the kifl area by using NaI(Tl) detector. The levels of natural radioactivity were measured for 26 samples in Kifl district for three different depths (0-5) cm, (5-15) cm, (15-20). The average specific activity of potassium-40, thorium-232 and uranium-238 were (140±1.82, 14.28±0.59 and 8.50±0.47) Bq/kg in depth (0-5) cm, (134.28±1.78, 13.64±0.59 and 7.31±0.44) Bq/kg in depth (5-15) cm, (127.36 ±1.73, 12.72±0.55 and 6±0.419) Bq/kg in depth (15-20) cm. The results of the study were within the permissible limits when compared with the values on UNSCEAR organization (412 for 40K, 35 for 238U, 45 for 232Th, 370 for Raeq, <1 for H(ex), <1 for H(in), 6 for Iγ, 59 for D(out), 84 for D(in), 0.07 for AEDE(out) and 0.4 for AEDE(in).
Electronic Properties Simulation of Guanine Molecule
Authors: Al-Saidi Shakir A. A. , Al-mebir Alaa Ayad K. 
Published: May 2020

Abstract
This work studies, theoretically, electronic properties of DNA-based guanine molecule. General formula for the transmission probability for electron transfer through Guanine Molecule is derived. Guanine molecule is assumed to be as one active region connected between two leads. In the transmission calculation, three different locations of the onsite energy were noticed due to the change of the gate voltages applied on the molecule. Also, the (I-V) curve characteristics of Guanine was obtained by using tight binding model and steady state. The current as a function of gate voltage, that is varying between -4 to 4 eV, is also investigated. It is found that the current arises and vanishes at different gate voltage values to show gate switching states. Further, the relationship between different gate voltage values and different bias voltage values was presented to show the logic gate behavior. Moreover, conductance as a function of temperature study was stated. It shows two current behaviors, independent and strong dependence on temperature value, that changes the leads energy. These properties can be effectively used for molecular electronic devices.
Research of loading of loose components the lock feeder at secondary temporary dispensing for non-mixing automatic machines
Authors: Evseev A V , Preis V V , Proskuriakov N E 
Published: May 2020

Abstract
Results of pilot study and their statistical processing on the basis of multiple-factor experiment are provided. Operation of the stand of the lock feeder applied to dispensing of bulks from metal powders by way of time separation from the flow of micro doses of components given by the feeder was investigated. These feeders are used as the automation equipment in conveyor, rotor and birotary non-mixing installations. Regression models for determination of the actual productivity of lock feeder are received. It is established that dependences of productivity of lock feeders on the circumferential speed of rotation of the dosing drum and its operating volume are nonlinear. At the constant volume of grooves, the same productivity can be received at different values, the circumferential speed of drum that is at implementation of the different kinematic modes. At design and the choice of processing equipment it is necessary to use the received dependences that will allow on the set actual capacity of the feeder to choose geometry and kinematic parameters of process of dispensing.
Wideband Signal Analyzer Based on Time-Interleaved ADCs with Digital Calibration
Authors: Fateeva A S , Nikonova G V , Kashchenko I E 
Published: May 2020

Abstract
This paper presents a novel architecture of wideband signal analyzer based on time-interleaved ADCs. Architecture of signal analyzer include improved method of digital calibration of ADC channels operating in the time-interleaved mode of input signals. This method is based on the least squares method. The advantage of the proposed method is high speed and high accuracy of ADC channels tuning in comparison with the majority of existing methods, which are based on the least squares method. The results of simulation modeling of the proposed method, including spectral analysis of the output signal before and after calibration, are presented. The comparison of the proposed method with existing methods is performed.
Diagnostics of electromechanical equipment by electrical power consumption parameters
Authors: Gordeev O I , Zakharenko V A 
Published: May 2020

Abstract
The relevance of problems of diagnostics and monitoring of the technical condition of electromechanical equipment is shown. An overview and analysis of specialized methods and technical tools designed to solve these problems are given. The main problems that arise in the practical application of modern methods and diagnostic tools are identified. The main advantages of using methods of diagnostics by electrical power consumption parameters are considered and the results of an analytical review of these methods are presented. A variant of the practical implementation of a stationary diagnostic complex for electromechanical units and the results of the development of functional schemes of the main components are proposed.
Performance characteristics’ study of a submersible electric motor based on the bench tests results
Authors: Kopyrin V A , Khamitov R N , Shakhova L V , Chashchin S O , Deneko M V 
Published: May 2020

Abstract
Currently, the majority of electric centrifugal pump installations are equipped with submersible induction motors. The simulation models’ development and the study of operating modes based on them should be accompanied by verification of the data obtained with experimental results. It is due to the design features of this electric motors’ type. Therefore, the aim of the article is to study the performance of submersible induction motor with a power of 70 kW. The performance is obtained on simulation model and their verification with experimental results. The simulation model of SEM-YA 70-117 M5B5 submersible induction electric motor is developed in the MATLAB/Simulink software environment during the research. The performance characteristics are also built. It is established that the relative error of the values obtained during simulation to the experimental data does not exceed 10 %.
Calculation studies of the heat supply system operating mode influence on the gas tube boiler heating surfaces temperatures
Authors: Mikhailov A G , Kikhtenko V A , Slobodina E N , Stepashkin I A 
Published: May 2020

Abstract
The paper considers the influence of the heat carrier temperature variation in supply and return pipelines on the efficiency of the gas tube hot water boiler operating in the heat supply system and on its surfaces temperatures. The temperature dependence graphs of the convective bundle tube wall and flame tube on the ambient temperature have been constructed. The basic calculation formulas used for the calculation as well as the temperature graph of the heat supply system operation depending on the ambient temperature and the temperature of the heat carriers are presented. The heat supply system operation modes, under which the convective bundle surfaces are subjected to the low-temperature corrosion, have been determined.
Thermal efficiency evaluation for multisection heat exchange equipment in heat power installations
Authors: Yanvarev I A 
Published: May 2020

Abstract
Comprehensive approach to improving heat exchangers for heat recovery and utilization of heat power installations is achieved by applying a step-by-step heat exchange process to be implemented in multi-section heat exchange equipment. Determination of its optimal structural, design and layout parameters can be carried out taking into account various criteria, including the use of the thermal efficiency function. Expressions for the thermal efficiency function of the objects under study are obtained in the form of complex, non-uniform heat exchange systems, on the basis of which the method for evaluating their execution options is developed. Optimal sequences of heat exchange sections, heat load distribution and operating modes for this equipment are determined.
Development of friction stir welding technology of low-carbon steel plates
Authors: Chenykh I K , Vasil’ev E V , Abakumov A N , Zakharova N V , Sinogina K A 
Published: May 2020

Abstract
The purpose of this study is to develop recommendations for low-carbon steel (0,18% C) products assembling technology using friction stir welding. Relevant information on the status of friction stir welding of low-carbon steels is presented and an analysis of existing articles is carried out. Experiments on joining plates of 4 mm thick by using the tool of different geometry are conducted. It was found that the optimum temperature when joining using WC tool is 800–950 °C. The sound welds is manufactured when using a conical pin at a tool rotation speed 500 rpm and a traverse feed rate 50 mm/min with a plunging depth of 0,05–0,1 mm and an axial force of 15–18 kN.
The features of oxidation of steel 15N8G6M3FTB deposited by a flux-cored wire
Authors: Eremin E N , Losev A S , Ponomarev I A , Borodikhin S A 
Published: May 2020

Abstract
The scale resistance of the deposited steel 15N8G6M3FTB subjected to surface oxidation at a temperature of 900 °C was studied. It was established that the main increase in the mass of scale for this steel occurs in the first hours, and later this dependence is almost straightforward. The average weight gain of the metal scale of such a coating at 900 °C is 0.0128 kg/(m2·h). It has been shown that the basis of metal oxide of composition 15N8G6M3FTB is hematite Fe2O3 and magnetite Fe3O4, as well as MnO, which have weak protective properties. The number of other phase compounds with high protective properties is extremely small. The coating of steel 15N8G6M3FTB can be used for applying to the surface of parts operating at low temperatures.
Indirect extraction of bar stocks in viscous flow mode
Authors: Pasynkov A A , Larin S N , Chudin V N 
Published: May 2020

Abstract
The process of isothermal indirect extrusion is considered under conditions of viscoplastic metal flow, which provides the forming of high-strength nonferrous alloys. We believe that stamping is performed under conditions of strain hardening and fracture of the processed material. The deformation kinematics was established based on discontinuous path velocity fields. An expression is obtained for estimating the specific pressure during backward extrusion based on the upper boundary method. Dependencies were obtained showing the influence of the relative value of the tool stroke, reduction during extrusion, friction between the tool and the workpiece, the strain rate on the specific pressure during extrusion. The results can be used to assess the influence of technological parameters on the course of the operation.
Study of the effect of sharpness of cutting tools on the formation of defects in the surface finish in micro cutting titanium alloys
Authors: Rechenko D S , Balova D G , Aubakirova A K , Kamenov R U , Churankin V G 
Published: May 2020

Abstract
The quality of machining of titanium alloys in the aviation and medical fields, characterized by the presence of micro vias, scales and surfacing on the treated surface, as well as the level of roughness is important in the manufacture of key parts. The quality parameters of the treated surface are influenced by many factors - cutting modes (cutting speed, depth and feed), cutting tool parameters (geometry of the cutting part, hardening coating, sharpness of the cutting wedge, etc.), technological equipment parameters (rigidity and accuracy), etc. The aim of the work was investigation of treated surface of titanium alloy VT1-00 when milling with small thicknesses of the shear layer, commensurate with the sharpness of the cutting wedge of the cutter. Method. The method of investigation of the treated surface during milling of titanium alloy on the micro level with the use of standard and high-quality carbide cutting tools is proposed. Results. Operating experience of the received carbide tool has shown that sharpness of a cutting wedge influences quality of the processed surface characterized by microwaves, scales and burrs, also by the roughness of the treated surface. On the basis of carried out researches it is established that for maintenance of conditions of normal cutting and chip formation it is necessary to provide sharpness of the cutting wedge characterized by the conditional entered radius of a blade rounding having values less than values of the sizes of grains of a processed material, that is re < 5 μm. Field of application. The obtained results of work allow to substantiate the recommendations on the required sharpness of carbide cutting tools used for milling of titanium alloys at the micro level. Conclusions. Experiments on the study of the process of cutting of titanium alloy VT1-00 at the micro level to determine the effect of cutting tool sharpness on the quality of the treated surface (microwaves, scales and burrs), allow to form recommendations on its initial state and determine performance.
Increasing wear resistance of steel 18Cr2Ni4WA with magnetron sputtering Cu-based thin-layer coating
Authors: Skobelev S B , Blesman A I , Polonyankin D A , Bezzateeva E G , Bury G G , Poteryaev I K 
Published: May 2020

Abstract
The paper studies the effect of parameters of a thin-layer copper-based coating applied by magnetron sputtering on the wear resistance of samples made of steel 18Cr2Ni4WA when working in a friction pair “18Cr2Ni4WA – cast iron GG 15”. The rational values for the thickness of the applied copper coating are determined, at which the lowest friction torque during the burn-in period and the minimum burn-in time are achieved. Jeol JCM-5700 Scanning Electron Microscope is used to study the friction track of samples and counter bodies. It is found that in the process of friction, the coating is selectively transferred from copper to the surface of the counter body, which significantly reduces the wear of the counter body.
Application of powder from alloy of brass L63, in the composition of elastomeric composite, for increasing the tension sensitivity coefficient
Authors: Titov Yu V , Rechenko D S , Nazarov P V , Yu Belan D 
Published: May 2020

Abstract
The range of rubber-cord products used in industry is quite wide. Their design includes determination of parameters during calculation and subsequent tests confirming their reliability, operability and properties. It is equally important to assess the stress-strain state (VAT) of a structure during operation, which allows to understand the accident rate, make a timely decision, collect statistics for effective development of new structures and improvement of old ones. The VAT control methods offered today have a number of drawbacks: the short service life of measuring and sensing elements, their introduction of errors in the operation of the structure, and often the inability to measure, for example, when working in aggressive media. The aim of the work is to evaluate the possibility of using brass powder L63, obtained by high-speed processing, in the elastomeric composite. To achieve the set goal it is necessary to solve the following problems: to make samples from the mixture with the addition of powder L63 and without it; to compare the samples from the received mixtures on the strain-sensitivity coefficient; to compare the samples from the specified mixtures in the process of mechanical loading on the breaking machine with simultaneous registration of electrical resistance. The results: Studies were conducted on the possibility of using ultra-dispersive powder L63 to improve the electrical properties of rubber. It has allowed to increase the coefficient of strain-sensitivity in 5-7 (in comparison with classical electroconductive rubbers), keeping their mechanical properties. Sensitive elements made of such a rubber mixture will give an opportunity to create “smart” composites, as well as to control the stress-strain state. Based on the results of these studies, the Act of Implementation has been issued.
Analysis of the impact of threats to change and block responses of experts in online survey systems
Authors: Efimov B I , Lozhnikov P S 
Published: May 2020

Abstract
The authors of the article analyze the impact of information security threats when conducting online surveys with an uncertain number of respondents. The article discusses threats to change responses of experts and block responses of experts. Finding the probability of making an erroneous decision using the methods of probability theory is a very difficult task. The authors propose using the Monte Carlo method as a solution. A software module that implements this method has been developed. We obtained the dependence of the probability of making an erroneous decision on the probability of changing the answers of experts, the probability of blocking the answers of experts and the number of respondents. The authors showed that there are critical values for the probability of changes in the responses of experts. These values determine the boundaries of ranges with different characteristics of the dependence of the probability of making an erroneous decision. The authors proposed two methods for finding one of the critical values. In conclusion, the authors formulated conditions that reduce the probability of making an erroneous decision.
Control the movement of an inverted pendulum by using a first-order type Takagi-Sugeno-Kang fuzzy controller
Authors: Kulikova I V 
Published: May 2020

Abstract
The article considers the possibility of using a fuzzy first-order Takagi-Sugeno-Kang type controller to control the movement of an inverted pendulum in order to achieve dynamic stabilization of its unstable equilibrium. The structure of linguistic variables and the base of rules for such a fuzzy controller are proposed. Graphs of changes in the controlled quantities (horizontal carriage displacement and angle of deviation from the vertical) and the control action are constructed, they illustrating the onset of dynamic stabilization of the unstable equilibrium of an inverted pendulum.
On the person and psychophysiological state identification using electroencephalogram parameters
Authors: Nigrey A A , Sulavko A E , Samotuga A E , Inivatov D P 
Published: May 2020

Abstract
The development of methods and technologies for the automatic determination of the psychophysiological state (PPS) of a person is an actual scientific and technical task. Early detection of the fact that the subject is in a sleepy state or in a state of intoxication at the workplace will help to avoid accidents, harm to life, health, and causing losses. In this work the EEG data of 30 subjects in normal, sleepy conditions and a state of mild intoxication were collected. As a result of the spectral and correlation analysis of the EEG data features were selected. An amount of information about the difference of the investigated states contained in the features was determined. A computational experiment on the recognition of human state according to EEG data based on the “naive” Bayes classifier was conducted. The following error level was achieved: 10.9% when recognizing the state of “norm” and “intoxication”; 0.2% when recognizing the status of “normal” and “falling asleep.”
Research of surface morphology of aluminum nitride films obtained by magnetron sputtering method
Authors: Baranova L V , Strunin V I 
Published: May 2020

Abstract
In this paper, we studied the surface morphology of aluminum nitride films obtained by magnetron sputtering intended for use in electronic devices. The main problem with this method of film formation is the large surface roughness of the film; therefore, the task to be solved is to improve the surface quality of aluminum nitride films by smoothing the surface roughness.
Reduction of error and expansion of spatial range of measurement of the electrical field strength sensor
Authors: Biryukov S V , Kolmogorova S S , Kolmogorov A S , Tyukin A V 
Published: May 2020

Abstract
The article is directed to improving the metrological characteristics of the previously investigated multi-element planar electro-induction sensor of the components of the electric field intensity vector. For this purpose, its mathematical model is made and analytic expression is obtained for error taking into account design parameters of sensor responsible for its error in nonuniform field and spatial range of measurement. Using mathematical model, geometric dimensions of sensitive elements of sensor are optimized in terms of minimum error and maximum of spatial measurement range. This allowed the following technical results to be obtained. At optimal parameter b = h/L (h - spacing between edges of sensor and electrode, L-linear dimension of sensor) of sensor error from field nonuniformity does not go out beyond 3% in all spatial range 0 ≤ a ≤ 0.2 (a = L/d; d-distance to field source). Thus, the sensor can be used for measuring at distances from the source of the field d equal to five linear dimensions L (d ≈ 5L).