bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of information and analytical tools based on adaptive classifier Cascade ARTMAP
Authors: Kashirina I L , Fedutinov K A , Bondarenko Yu V
Published: May 2020

The article deals with methods of teaching incremental classifiers capable to adapt to incoming online streaming data, using the example of environmental monitoring systems. It is proposed to use Cascade ARTMAP neural network architecture, compatible with symbolic representation based on IF- THEN rules. The knowledge gained during Cascade ARTMAP network training can be transformed into a compact set of decisive rules for classification of source data that can be easily interpreted by experts in the field of environmental assessment.
Computer modeling system of chemical processes in tubular reactors
Authors: Polosin A N
Published: May 2020

A computer modeling system of chemical processes in tubular reactors has been developed. The system helps researchers (technologists, designers) to determine rational modes of operation of tubular reactors, which ensure compliance with the requirements for efficiency indices of chemical processes carried out by various mechanisms. The system includes a module for setting the mechanism of the chemical process, modules for structural synthesis and parameters adjustment of the dynamic mathematical model of the chemical process, a library of finite-difference methods for solving the equation of convective transfer of substance, a module for calculating distributions of concentrations of raw substances and reaction products along the length of the reactor and during time, a module for calculating efficiency indices, a module for generating and storing a modeling report. The information ware of the system includes databases of geometric parameters of tubular reactors and procedural ranges of technological parameters of chemical processes. Databases allow the system to be adjusted according to the tubular reactor brand. The results of the modeling are presented in tables, 2D and 3D graphs of the concentration distributions of raw substances and reaction products. The system has been tested according to the data of thermal decomposition of ethylene, benzene oxidation, pyrolysis of mixture of ethane, butane and propane, production of vinyl acetate. The testing results have confirmed the adequacy of the proposed mathematical description of chemical processes in tubular reactors and the operability of the created software solution.
Performance of super-resolution algorithms under applicative noise
Authors: Savvin S V , Sirota A A
Published: May 2020

The paper considers the problem of multi-frame super-resolution under applicative noise which generates distributed regions of outlying observations in low resolution images. The analysis of existing solutions is performed. They include algorithms based on spin-glass models and Markov random fields used to remove applicative noise. The authors suggest their own approach, which involves using a recurrent algorithm of quasi-linear optimal filtering of a sequence of low resolution images together with superpixel segmentation performed in order to determine the regions damaged by applicative noise. The considered algorithms are compared as applied to a set of test images. The results of the experiment demonstrate that the suggested approach allows for more accurate recovery of HR images than the existing analogues.
About the problem of flow past around thin profiles
Authors: Malyutin K G , Kabanko M V
Published: May 2020

In this paper some approaches to solving the problems of flow past around thin profiles are presented. We consider the problem of flow past around a contour defined by a set of segments, each of which is close to the segment ( a; a). A formula that gives an approximate velocities distribution in a flow flowing around a system of thin profiles is obtained. A mixed boundary-value problem for an analytic function in the upper half-plane is studied. A system of singular integral equations having a unique solution up to two arbitrary constants in the class of functions that are boundary values of analytic functions in the upper half-plane is obtained. Considered the generalized problem of flow past around thin profiles for infinite numbers of thin profiles.
Optimal management of website under adverse impacts conditions
Authors: Churakov D , Tsarkova E , Vorotnikova T , Belyaev A
Published: May 2020

The paper considers a mathematical model for managing a website of a company operating in a competitive environment. Management is carried out in order to maximize profits. Optimal control actions is determined using Pontryagin’s maximum principle. Numerical solution is obtained using iteration algorithm based on gradient descent method. The obtained results form the basis of a software application that can be used as a management decision support system.
Comparison of analytical and numerical modeling of distributions of nonequilibrium minority charge carriers generated by a wide beam of medium-energy electrons in a two-layer semiconductor structure
Authors: Kalmanovich V V , Seregina E V , Stepovich M A
Published: May 2020

An analytical matrix method that makes it possible to calculate the distributions of nonequilibrium minority charge carriers generated in multilayer planar semiconductor structures by external influence is described. For the case of generation of nonequilibrium minority charge carriers by a wide electron beam in a two-layer structure, the results of model calculations using the analytical matrix method with the results of calculations using a numerical conservative difference scheme are compared. It is shown that the method allows to carry out calculations of the distributions of nonequilibrium minority charge carriers in a relatively short time with an accuracy sufficient for practical use in electron probe technologies.
Study of stress-strain behavior of a compressed elastic strip
Authors: Minayeva N V , Gridnev S Y , Skalko Y I , Sabynin D V
Published: May 2020

The paper considers the plane strain of a compressed elastic strip made from incompressible material. The deviation of the cross-section contour from the rectangle, as well as the intensity of the force applied to the upper and the lower edge of the section are known up to small parameters. The authors have carried out a study of the problem solution analyticity with respect to small near zero parameters. With the help of the perturbation method, they have found a solution for a particular case of the function describing the deviations up to the second order of smallness. It has been shown that if an experimental research is carried out and the applied force meets the condition described, the average stress and displacement values will differ from those typical for homogeneous state only by a second order infinitesimal.
Evaluation of the optomechanical effect in coatings made of photopolymers
Authors: Murashkin E V , Popov A L , Kozintsev V M , Chelyubeev D A , Chentsov A V
Published: May 2020

The study on the optomechanical effect (photostriction) in the material used in 3D printing by layer-by-layer photopolymerization is performed. The calculation - experimental model in the form of a steel console plate with the one-sided photopolymeric coating is developed for studying of this effect. The experimental setup including UV source, the set of irradiated identical consoles, part of which had the photopolymer coating, the speckle-interferometer device for registration of bending micro displacements of the consoles called by photostriction shrinkage of the coating, is collected. The temperature bending of the plate during is irradiation by the UF-source was determined. The Magnitude of the optomechanical shrinkage in comparison with the temperature bending of the plate with a photopolymeric coating at the fixed radiation time is experimentally determined. The technique is developed for calculation and allocation of the optomechanical effect against the background of temperature bending of the plate with a photopolymeric coating and value of earlier undetermined coefficient of linear dilatation of the photopolymer is obtained. Also the residual stresses which generate in the coating owing to optomechanical effect are defined.
Waveguide modal analysis of the ultrasonic medical instrument
Authors: Phyo Aung Pyae , Yuri Vsevolodovich Grigoryev
Published: May 2020

Numerical procedure for analysis of eigenfrequencies and eigenfunctions of ultrasonic medical instrument waveguide is presented. A curved beam of variable cross-section is considered as a design scheme for the waveguide with respect to different boundary conditions. Test analysis for clamped-free curved waveguide is developed with MathCAD complex.
A model of dynamic reflection of a longitudinal shear crack from a stressed boundary
Authors: Bykova M I , Verveiko N D , Shashkin A I , Krupenko S E , Nekrasova N N
Published: May 2020

The modeling of the phenomenon of reflection of the front edge of a longitudinal shear crack from a stressed boundary is considered. The front edge of crack is modeled by an extreme along the edge rupture of rates and stresses exceeding the plastic limit propagating as an orthogonal trajectory of a longitudinal wave of plastic loading. The dependence of the intensity of the reflected cracks of a simple shear and detachment (as a function of the angle of incidence of the initiating crack) on the stress at the boundary at the moment of reflection and on the physical constants of the material is investigated. The conditions for the absence of reflected cracks of shear and detachment and criteria for boundary stresses initiating the cracks of various types are obtained.
Calculating stress intensity factor for high-velocity crack
Authors: Belaya L A , Lavit I M
Published: May 2020

In this paper the earlier elaborated finite-element method of calculating the stress intensity factor for stationary cracks at dynamic loading by means of cohesion finite elements and on the basis of the method of lines is generalized for high-velocity cracks. The method in question does not require rearranging the finite-element mesh. The crack growth is modeled by consecutively releasing the nodes located on the crack line. The calculated data are compared with the analytical solutions of other researchers and with the experimental data.
Combining the method of boundary states and the Lindstedt–Poincaré method in geometrically nonlinear elastostatics
Authors: Penkov V B , Levina L V , Novikov E A , Novikova O S
Published: May 2020

The study considers a statement of geometrically non-linear problems of isotropic theory of elasticity for a simply connected bounded body. The Lindstedt–Poincaré method reduces the problem to a weakly non-linear variation containing a small parameter. The solution is then effected at each step of the perturbations method through the means of the method of the boundary states with perturbations (MBSP). Each iteration is accompanied by a generation of fictitious volume forces of a polynomial nature. The study proposes a strict particular solution and a solution of an elasticity problem for iteration. The approach is also applicable to thermoelasticity problems. The method is tested on classical axially symmetrical bodies, i.e., cylinders subjected to uniaxial tensioning or twisting. The study confirms the applicability of flat section hypotheses to linear engineering calculations. Nonlinear distortions mostly happen at the first iteration, followed by a weak correction. We also provide a calculation for and an illustration of a stress-strain state (SSS) of a semicylinder under unbalanced axial loads and a concentration of compression stresses in extended bodies’ middle areas that are remote from load-free surfaces.
Determining the type of initial anisotropy of elastic material from a series of experiments
Authors: Khristich Dmitrii , Sy Toan Nguyen , Sukhorukov Dmitrii
Published: May 2020

An experimental program has been developed to identify the type of initial elastic anisotropy of the material. The program includes a series of compression experiments to determine the orientation of the principal axes of anisotropy of the material and additional experiments to find the orientation of the canonical axes of anisotropy. In order to distinguish isotropic and cubic materials, it is necessary to fulfill an experiment on biaxial tension-compression in the direction of two canonical axes of anisotropy, and a shear experiment in the same plane. Similar experiments make it possible to identify trigonal, tetragonal and hexagonal materials. To identify triclinic, monoclinic, and rhombic materials, three shear experiments in planes determined by the canonical axes of anisotropy are required.
One example of image digital processing of experimental data obtained by the method of photoelasticity
Authors: Kosygin A N , Kosygina L N , Usacheva V N
Published: May 2020

The article is devoted to the digital processing interferograms (isochromatic fringe patterns) obtained by the photoelasticity method. The application to interpretate the isochromatic fringe patterns allows us to automate image processing, gets to avoid the routine and time-consuming work. The features of the developed software package are described in detail by means the problem of stretching plate with two symmetrical edge notches. The application’s algorithm includes following main steps: image pre-processing, localization interference fringe, fringe tracing. The application creates a text file containing all the necessary data to further determine the stress-strain state (isochromatic fringe’s number and locus of fringes).
Betweenness centrality in corona product of Knand Cmgraph
Authors: Haryadi T I , Susilowati L
Published: May 2020

The concept of betweenness centrality is currently widely used in network analysis such as computers network and social network. Betweenness centrality is one of the concepts developed in graph theory. The concept of betweenness centrality discusses the magnitude of the potential of a point in influencing a network. A pointxhas the potential to affect the network if it is in the shortest path between a pair of two other points. In this paper, the concept of betweenness centrality will be integrated with the product of corona operation in graph. Corona is one of the operations in graph theory. This operation works between two graphs by multiplying the second graph and connecting with the first graph. This paper will investigate the concept of betweenness centrality in graph resulting from corona operations ofKnandCmgraph.
Hp-discontinuous Galerkin Finite Element Method for Incompressible Miscible Displacement in Porous Media
Authors: Abdul-Khaliq Kashkool Hashim , Jaaywel Saadoon Jawad
Published: May 2020

We used (hp-DGFEM) for solving the coupled system of incompressible miscible displacement problem in porous media. Flow and transport equations are solved by hp-symmetric interior penalty Discontinuous Galerkin (hp-SIPG) method. We prove the error analysis in the energy norm to the coupled system of incompressible one-phase flow problem.
Design and development of a web traffic analyser
Authors: Ali Salim M , Neamah Mustafa A
Published: May 2020

This paper focuses on web traffic analysis; we explore the complexity of modern web pages by tracing network packets for the types of objects requested when loading a web page. Furthermore, web pages are not analogous to each other, their design and implementation relies on the purpose of the website. Similarly, web pages that are designed for a specific area, say e-commerce, would have the same development process, which then reflects on the code and objects used to develop such websites. This will lead us to a speculation that web surfers who have similar intention of browsing, they will have similar web traffic in terms of number of different objects and the total size of data transferred through the network. Conversely, inspecting the type, size and number of objects within the browsing session will show us an approximate of what the users’ intention to browse or like to browse next.
Effects of Impulse Noise on Massive MIMO
Authors: Yousif Dawod Adnan , Fakhrulddin Abdulqader Mohammed , Saad Hameed Saif
Published: May 2020

The usage range of nowadays wireless communications become wide, all of the develop applications uses wireless communication which improve the mobility and improve the mobility of the network subscribers. As known that the antenna diversity scheme developed from “SISO” to “MIMO” that has a maximum capacity and ability to improve the communication quality with a good shields among the fading effects and other impairments. In this research work study and analysis to the antenna systems and antenna schemes was done taking into consideration the central antenna system and the distributed antenna system “CAS” and “DAS”. A Matlab simulation was developed to test antenna configuration system in term of effeteness of fading channel while using different modulation order.
On J–Lifting Modules
Authors: Kabban Ali , Khalid Wasan
Published: May 2020

Let R be a ring with identity and M is a unitary left R–module. M is called J–lifting module if for every submodule N of M, there exists a submodule K of N such that

M
=
K
⊕

K
′

,
 

K
′

⊆
M

and

N
∩

K
′

≪
J

K
′

. The am of this paper is to introduce properties of J–lifting modules. Especially, we give characterizations of J–lifting modules.We introduce J–coessential submodule as a generalization of coessential submodule . Finally, we give some conditions under which the quotient and direct sum of J–lifting modules is J–lifting.
Early Prognosis of Human Renal Cancer with Kaplan-Meier Plotter Data Analysis Model
Authors: Almansouri Saif , Zwyea Susan
Published: May 2020

Clinical data analysis is one of the powerful learning methods in cancer research. Several analysis methods have been used for detection purposes in computational pathology. However, little information is known about the model features. Here, we described Kaplan-Meier plotter analysis model as a powerful tool with new features. The model combines fellow up threshold, disease stage, and race to ensure better validation for genes as prognostic biomarkers in early disease stages. The proposed model is evaluated for the relevance role of Rab1A, an oncogene, in renal cancer early prognosis on the benchmark datasets from The Human Protein Atlas. We found Rab1A overexpression in human renal cancer has potential role in early prognosis of the disease and it is associated with poor prognosis (p<0.05). Our model results were also confirmed in an independent dataset in The Human Protein Atlas. Together, our studies emphasize the role of Rab1A in human malignancies and identify Rab1A as a new prognostic predictor for human renal cancer.
On small (T-extending) module
Authors: Rzaij Mohammad Zainab , Mahmood Yassin Sahira
Published: May 2020

Let R be associative ring with identity and let N be a left R-module . We introduce the concept of small T-extending module. Let T be a submodule of a module N. We say that N is ST-extending module (ST-extending), if every submodule of N which is contains T is small T-essential in a T-direct summand of N. And some basic properaties of this concept.
On Micro-α-Open Sets and Micro-α- Continuous Functions in Micro Topological Spaces
Authors: Rasheed Reem O. , Jasim Taha H.
Published: May 2020

The principle point ofithis paper is to present new type of topologicalispaces are introduced by nano topology and so on Nano topology introduced by Thivagar using this nano topology we introduced micro topology and also introduce new type of open sets namely of Micro-α-open sets furthermore, a portion of their properties are researched. As application to Micro-α-open sets we introduce Micro-α-continuous functions also, get a portion of their essential properties
Coarse WDM in Metropolitan Networks: Challenges, Standards, Applications, and Future Role
Authors: Maad Hamdi Mustafa , Audah Lukman , Abduljabbar Rashid Sami , Al-Mashhadani Mohammad A.
Published: May 2020

Coarse Wavelength Division Multiplexing (CWDM) denotes a technology of diaphanous transport which aids to transmit simultaneously a large number of services across a single optical fiber. This technology relies on the usage of optical channels which are 20 nm from each other. These channels are employed in the CFO OPX products, which ranged from 1270 nm until 1610 nm, had been set in ITU-T G - 694.2 recommendations. ITU-T managed to determine 18 optical channels together, though 16 only are used in reality, in the case of using the two lowest channels which are avoided because of the excessive-high attenuation of glass. However, the review study presented in this paper deals with the CWDM technique as the best choice in decreasing capital expenditure after taking into consideration the simplicity of design, the capability of expanded transmission, low cost of components and reduction in operational cost. The paper also focused on the standards, applications and future role of the CWDM technique.
Solving Three-Dimensional Groundwater Recharge Based on Decomposition Method
Authors: Kareem Z H , Tawfiq L N M
Published: May 2020

In this paper the mathematical model of moisture content in soil have been designed in the form of three-dimensional nonlinear PDEs. The analytical solution of model equation has been obtained by using the combine LA-transform with decomposition method. The accuracy and efficiency of suggested method is illustrated by three problems.
Capacity analysis & performance comparison of SISO, SIMO, MISO & MIMO systems
Authors: Alrubei Mohammed A. T. , Alshimaysawe Ihsan A. , Hassan Ashwaq N. , Khwayyir Ali H. K.
Published: May 2020

Today trade wireless communication systems are wanted to equip reliable communication and bigger data rates. Two considerable challenges in system design are the restricted fading and spectrum due to multipath components in the wireless system. Multiple transmission and reception can be used to form (MIMO) multiple input multiple output channels to raise the data rate and capacity. The advantages of utilizing multiple antennas are to get reliable performance and a higher data rate. In this paper, an attempt is made to design and simulate SISO, SIMO, MISO and MIMO systems. We have analyzed and compared the performance of these systems based on SNR and channel capacity in a different number of an antenna. The effect of the number of an antenna (4, 8, and 16) on the channel capacity over a range of SNR (0-30db) for the systems is examined. The system performance is simulated in Matlab. The results of the simulation show that as significant improvement in the capacity of systems reached dramatically to 214 (bits / Hz / Sec) when SNR = 30 and (16X16) MIMO is used.
Simulate a first-order Bézier curve in image encoding
Authors: Abdul Hameed Jassim Al-kufi Mohammed , Kadhim Ola N. , Saleem Razaq Eman
Published: May 2020

Bézier curve of the first rank is a simple equation in terms of form, but it is characterized by the nature of private transactions making it difficult to use in image encryption because the dispersion of color values is not enough, this results in an encrypted image that gives clear references to the original image. This weakness in the equation does not exist in the case of text encryption where enough to change the numerical values of the components of the text to get a digital matrix representing the encrypted text.Through this algorithm we have used the Bézier curve technique from the first order of image coding we used a new method to generate the coefficients of the equation where we simulated the Bazier equation where it became as follows:

• y=x_1*(t-1)+x_2*t

• Where 0<t<1

To illustrate the work of this technology in image encoding the core of our work is in choosing a vector (1 × 4) with four numerical components )k_1, k_2, k_3, k_4 ( So that k_1<k_2 and k_3 <k_4, k_1 and k_2 have the same signal, as well as k_3 and k_4 also have the same reference to give them t_1 and t_2 Where t_1=k_1/k_2 and t_2=k_3/k_4 which will ensure that both have t_1 and t_2 have positive values less than 1. We have thus designed the equation of Bézier curve suitable for a scattering of color values of the image process, as well we’ll see it by explaining the way in detail below and tables of readings and global standards that have been inferred by the application of the algorithm
Two Reliable Iterative Methods for Solving Chaos synchronization
Authors: Gani Sayl
Published: May 2020

In this article we proposed two reliable iterative methods for solving Chaos synchronization. The iterative methods are the Adomain Decompustion method (ADM) and Variational Iteration Method (VIM). The ADM and VIM are solved several problems in different areas which accuracy and efficiency in the results. The solution which get is an approximate solution is accuracy as we well show that in figures and tables for the analysis of maximum error reminder various. The software which used in the study for the calculations was MATHEMATICA 11.
Inserting Virtual Static Object with Geometry Consistency into Real Video
Authors: Sami Ibrahim Abdul-Wahab , Mhamed Taher Sarab
Published: May 2020

Given the importance of augmented reality in recent years and its wide spread in many fields of media industries, practical fields such as medicine, education, and others. This study present a methodology in order to insert virtual static object into a real video environment for improve the reality with a virtual information that was not actually present. There are several problems needs to be overcome during the process of merging the virtual object such as geometry of shapes, registration, and illumination. The aim of this study is to make the virtual static objects look like it actually exists in the same real video environment in terms of dimensions, sizes and consistency of shapes. The following steps of the proposed method are: Firstly convert original video file into frames. Secondly separate the background from foreground by rebuilding the background model, then obtain the foreground objects by subtract original frames of the video from background. Thirdly apply the background segmentation. Then extracting the features for every one of the segments and extracting the features of virtual static object. Fifthly selecting a suitable segment (area) for insert the virtual object.
Spectrum of Soft Compact Linear Operator with Properties
Authors: Khaleefah Sabah A , Ahmed Buthainah A A
Published: May 2020

Soft operators defined on soft normed spaces are relatively modern concepts. Many properties of these operators have not been thoroughly studied. We have introduced in this paper some new concepts related to the soft compact operators such as spectrum of soft compact operator, null space of soft compact operator and rang of soft compact operator. Many important theorems related to these concepts were introduced.
Hyper AT-ideal on AT-algebra
Authors: Tawfeeq Hameed Areej , Kareem Fatema F. , Hussein Ali Saba
Published: May 2020

In this paper is to introduce the concept of hyper AT-algebras is a generalization of AT-algebras and study a hyper structure AT-algebra and investigate some of its properties. “Also, hyper AT-subalgebras and hyper AT-ideal of hyper AT-algebras are studied. We study on the fuzzy theory of hyper AT-ideal of hyper AT-algebras hyper AT-algebra”. “We study homomorphism of hyper AT-algebras which are a common generalization of AT-algebras.
Fuzzy α-translation AB-ideal of AB-algebras
Authors: Hameed Ghazi Israa , Hameed Dr. Areej Tawfeeq , Abed Dr. Ahmed Hamzah
Published: May 2020

In this paper, we present the idea of fuzzy (normalized) fuzzy translaition and enlarged mysterious extensions of semi-foggy AB and fuzzy AB-ideal on AB-algebra and examine their characteristics and related matters.
Use Information Standards methods to select the best linear regression model of digital image
Authors: Chachan Fathala A.
Published: May 2020

In this paper, several models of digital linear regression were proposed to test the effect of digital treatments on the image, and then choose the relatively better model among the appropriate models and test their quality by adopting special criteria (Akaike Information criteria, Bayesian information criteria BIC, Hannan – Quinn criteria HQC) In this research it was found that the image was processed and underwent its work (rotate, change its background, minimize it, and improve its contrast) it has better quality compared to other pictures for having lowest value (AIC, BIC, HQC)
Determination the optimum orbit for low Earth satellites by changing the eccentricity
Authors: Ibrahim R H , Saleh A H
Published: May 2020

The main objective of this paper is to determine an acceptable value of eccentricity for the satellites in a Low Earth Orbit LEO that are affected by drag perturbation only. The method of converting the orbital elements into state vectors was presented. Perturbed equation of motion was numerically integrated using 4th order Runge-Kutta’s method and the perturbation in orbital elements for different altitudes and eccentricities were tested and analysed during 84.23 days. The results indicated to the value of semi major axis and eccentricity at altitude 200 km and eccentricity 0.001are more stable. As well, at altitude 600 km and eccentricity 0.01, but at 800 km and eccentricities (0.01, 0.05 and 0.1) the stability of the orbit was not depending strongly on eccentricity value, because the effect of the drag is too small.
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

Binary 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.