bluuebunny/crossref_metadata_2025_split huggingface dataset:
Antifriction wear-resistant coatings process development for sliding bearing friction surfaces of submersible pumps
Authors: Arkhipov V E , Pugachev M S , Zh Sakhvadze G 
Published: March 2020

Abstract
The tribotechnical coating structure using a mechanical mixture of copper and zinc particles obtained over a wide temperature range of air flow under ultra-high-speed gas-dynamic spraying is studied. Comparative tests were carried out to assess the tribotechnical properties of various composition gas-dynamic coatings and industrial compact antifriction alloys, which showed the advantage of gas-dynamic coatings of copper-zinc-corundum composition. The antifriction wear-resistant coatings production process by cold gas spraying can be recommended for sliding bearings of submersible pumps.
The definition of longitudinal forces in the rail by changing its eigen frequency
Authors: Chunin S V , Shabunevich V I , Akashev M G 
Published: March 2020

Abstract
The article discusses methods to evaluate the longitudinal stress level in the rail formed as a result of the thermal expansion of the continuous welded rail track. The comparative analysis of results of bench and field tests, as well as the verification of the mathematical model of the track section, have been performed.
Numerical analysis of forced vibrations of the Golden Gate suspension bridge in the case of the 1:1 internal resonance
Authors: Katembo A L , Kandu V V , Shitikova M V 
Published: March 2020

Abstract
Nonlinear force driven coupled vertical and torsional vibrations of suspension bridges, when the frequency of an external force is approaching one of the natural frequencies of the suspension system, which, in its turn, undergoes the conditions of the one-to-one internal resonance, are investigated. The generalized method of multiple time-scales is used as the method of solution. The damping characteristics are described by the rheological model involving a fractional derivative, which is interpreted as a fractional power of the differentiation operator. The main subject of this research is the numerical analysis of the influence of the fractional damping on the dynamic behavior of a suspension combined system.
Contact interaction of NEMS shell elements in a color noise field
Authors: Papkova I V , Yu Krylova E , Krysko A V 
Published: March 2020

Abstract
A mathematical model of behavior a spherical size-dependent shell and plate taking into account contact interaction is constructed. The effect of the color noise field on the mechanical system is taken into account. The following hypotheses were taken as initial hypotheses: the shell and plate material is isotropic, the Cosserat elastic pseudo-continuum with constrained particle rotation, and the Kirchhoff – Love kinematic model. The equations of motion are obtained on the basis of the following theories: Theodore von Karman (geometric non-linearity), B.Ya.Cantor theory (accounting for contact interaction).
Nanosized iron-substituted hydroxyapatites
Authors: Fadeeva I V , Selezneva I I , Davydova G A , Fomin A S , Gafurov M R , Barinov S M , Poltavtsev A M , Davydova I B , Zaraisky E I , Poltavtseva R A 
Published: March 2020

Abstract
Introduction of iron ions into hydroxyapatites imparts some useful properties to ceramic materials. We created a porous ceramic material from nanosized iron-substituted HA and studied its physico-chemical and biological properties. It is shown that all the iron ions introduced in the course of synthesis enter into the composition of HA and are characterized by the oxidation state +3. The size of crystals after thermal treatment at 9000 C does not exceed 100 nm, the crystals’ shape is close to a sphere. Porous materials from nanosized iron-substituted hydroxyapatites support adhesion and growth of anchorage-dependent cells of mammals.
The study of special positions of a crawling robot when changing its configuration
Authors: Yu Vorochaeva L , Malchikov A V , Yatsun A S , Martinez A 
Published: March 2020

Abstract
The paper considers the movement of a crawling robot, consisting of three modules, along a horizontal rough surface when changing its configuration. The fundamental characteristic of the research object is its equipping with support elements with a controlled coefficient of friction, due to which the movement along the plane can occur with the periodic fixation of two supports on the surface, which makes the device more maneuverable and high-speed. Another feature of the proposed construction is the controlled length of each module due to the prismatic pairs. This allows the robot to adapt to space limitations, such as corridors, obstacles, etc. The paper proposes a system for controlling the lengths of the robot modules, as well as the angles of their rotation when moving while fixing on the surface the two extreme supports of the side links. This system is sequential, first the central module is controlled, then one of the side modules, and only after that the second side module. Transitions from one control stage to another are carried out when the module length reaches its maximum permissible value. The paper analyzes the operation of the control system, and also examines in detail the issue of the robot transition to special positions.
Calculation Of The Heat-Stressed State Of The Disk Using Free Software Code_aster
Authors: Cherednichenko A.V , Maksimova E.A , Savelyeva I.Yu 
Published: March 2020

Annotation
A numerical calculation of the axisymmetric heat-stress state of the turbine disk was performed using the free Code_Aster software. Distributions of temperature, radial displacements, and also radial and axial stresses in the cross section of the disk are presented.
Influence of quality on the stress-strain state of the road fence post assembly
Authors: Demiyanushko I V , Nadezhdin V S , Titov O V , Lokit A G 
Published: March 2020

Abstract
In article compares results of mathematical modeling by the finite element method (FEM) for different assembly options. The object of the study was a prefabricated bridge guardrail post made of steel 3. After mathematical modeling, post deformation patterns obtained, corresponding to different eccentricity values of the installed post plate
Principles of functioning of the autonomous device for weed control for precision agriculture
Authors: Dyshekov A I , Smirnov I G , Mirzaev M A , Shereuzhev M A 
Published: March 2020

Abstract
The article shows the results of creation of a system aimed at reducing the negative impact on the ecological situation and biological systems while eliminating weeds in beetroot production. Methods of controlling weeds using machine vision technology are examined. For machine vision algorithms a library of images has been prepared. An algorithm and technical device have been developed for cultivating the soil on the early stages of beet growth.
To the issues of ensuring the stability of jib mobile cranes, taking into account various aspects of their operation
Authors: Emelianova G A , Kulikova C V , Gulyaev F A , Batischev Y A 
Published: March 2020

Abstract
The article is considered requirements of standards for crane stability analysis of mobile cranes. Proposed supplement about crane stability tests to Federal norms and rules for safety lifting hoisting equipment.
Construction of verification and diagnostic tests for the functional diagram of the object of the diagnosis
Authors: Filina O A , Salnikova O V 
Published: March 2020

Abstract
This article is devoted to the problem of technical diagnostics in urban electric transport and electrical facilities. To find the solution to this problem, it is necessary to transfer the qualitative determination of the Vehicle into some quantitative basis. The formalization of qualitative definitions is essential to the construction of formal (computable) diagnostic procedures.
Analysis of the structure of a precision winding using computer simulation
Authors: Kolesnikov V A , Rokotov N V 
Published: March 2020

Abstract
The article presents the results of computer simulation of winding structures. With random winding, a significant change in the structure of the winding product occurs even with a slight increase in the diameter of the package. With precision winding, slight deviations in the pitch of the winding of the thread lead to a significant change in the structure of the winding product.
Comparison of dynamic characteristics of the ideal field oriented control model and its based on act (automated control theory) real analogue
Authors: Myasoedov K R , Epifanov E D , Masyuk V M , Pchelkina I V 
Published: March 2020

Abstract
This article is dedicated to the accuracy of modeling the dynamic characteristics of a field oriented control model. The field oriented control model is based on automatic control theory and using the parameters of a real electric motor. As a result of the simulation, several dynamic characteristics were obtained. The comparison of these characteristics with the dynamic characteristics of the assembled system of field oriented control of a real electric motor is carried out. It is concluded that the operation of the field oriented control model with a certain error corresponds to the operation of the field oriented control system of a synchronous electric motor.
Time-optimal trajectories for a trolley-like system with state constraint
Authors: Samylovskiy Ivan 
Published: March 2020

Abstract
We consider a time-optimal problem for trolley-like system (matherial point with inertia) passage from start to zero position (i.e. origin) under bounded control (acceleration) and linear state constraint. We solve it with Pontryagin maximum principle for state-constrained problems usage. We construct optimal trajectories synthesis and show that it is not simple “cut” of classical trolleyplike problem synthesis. State constraint generates “forbidden zone” bounded by state constraint boundary and half of parabola. We also shows that optimal trajectory (for selected range of state constraint line coefficient) has no more than three switching points (for the classical case, there is no more than one switching point). We analyse synthesis for different cases of parameters and demonstrates its evolution.
The system of vertical movement stabilization of the geophysical rocket for the purpose of high-precision measurement
Authors: Verkner A S , Guryanova E O 
Published: March 2020

Abstract
The paper shows the system of vertical movement stabilization of the geophysical rocket (GR) for the purpose of high-precision measurement. The stabilization system is one of the main systems comprising GR’s vehicle information and control system (VICS). The model uses kinematic relations reflecting continuous changes of yaw, pitch and roll angles expressed with dynamic and kinematic equations. The computer model of GR vertical movement stabilization was developed, verified and simulated by means of SimInTech dynamic modeling.
Comparison of the results of solving the problem of nano-beams contact interaction according to different theories of size-dependent behavior
Authors: Maxim Viktorovich Zhigalov , Victor Alexandrovich Apryskin 
Published: March 2020

Abstract
A mathematical model of the package for two nano Bernoulli-Euler beams connected through boundary conditions is constructed. Used gradient theory of elasticity, nonlocal theory of elasticity and the theory of the account of contact interaction of B. Ya. Kantor. The influence of the length dimension parameters on the modes of beam vibrations is studied.
Algorithm For Constructing Modified Relative Phase Permeability For The Average Model Of Three-Phase Filtration In A Multilayered Layer
Authors: Yakupov Z.Ya , Abdulaziz Abrahem Hussain , Bogomolov V.A , Plokhotnikov S.P 
Published: March 2020

Abstract
The paper presents models of relative phase permeabilities for laboratory relative phase permeabilities. A technique has been developed for modifying the relative phase permeabilities taking into account the jet flow. Using a computational experiment, the applicability of the proposed averaged models was investigated. The models described in the article are applicable in numerical calculations for multilayered reservoirs in order to reduce the dimension of the problems under consideration.
Intelligent Nero modelling methods for PV panel system
Authors: Ahmed Hasan Ibtisam , Jawad Mohammed Mohammed , Attya Lafta Fatima 
Published: March 2020

AbstractNonlinear system identification modelling for the temperature of photovoltaic (PV) panel has been conducted in this work. In the beginning, an experimental work has been extracted from previous work in order to collect the input (ambient temperature, humidity, irradiance and wind speed) and output (PV module temperature) parameters. Then, Neural Network time series and Adaptive Neuro-Fuzzy Inference System (ANFIS) models represented as system identification method to predict the temperature of PV panel as an output for the system. Both of modelling methods verified using mean square error (MSE). The effectiveness of all methods has been compared to know which method is the batter. Finally, the achieved results stated that the ANFIS method recorded the lowest MSE of 2.2627*10−7compared with NARX method which recorded of 5.078. ANFIS technique proved that will be able to use it in the control process in future.
Experimental and Numerical Assessment on S-shaped Diffuser performance with different Turbulence Intensity
Authors: Jessam Raed , Al-Kayiem Hussain H. , Nasif Mohammad S. , Abed Jaddoa Albuali Ameer 
Published: March 2020

Abstract
The turbulence structure in air intake S-shaped diffuser is proven to be influencing parameter on the diffuser performance. In the present research work, experimental and numerical investigations have been undertaken to explore the effect of inlet turbulence intensity level on the performance of air intake S-shaped diffuser. Detailed measurements including pressure and velocity at the inlet and outlet planes and static pressure on the top and bottom walls were taken at three pre-selected Reynolds numbers of 4.8×104, 6.4×104 and 7.5×104. The predicted corresponding turbulence intensities at the experimented three Re, were 4.16%, 3.15% and 2.8%. ANSYS-FLUENT 15 software with Standard k-ε turbulence model has been used for numerical simulations. Numerical results of static pressure recovery, total pressure loss coefficient and wall static pressure recovery have been compared with the experimental results. The experimental results indicate that increasing Reynolds number at the inlet of S-shaped diffuser resulting in slight decrease in measured turbulence intensity. Also, as Re increased from 4.8x104 to 7.5x104, the static pressure recovery increased by 9% and the total pressure loss coefficient was reduced by 4.9%.
Lead-free perovskite and double perovskite solar cells
Authors: Mashot Jafar Aqel , Khalaph Kawther A. , Moula Hmood Amar 
Published: March 2020

Abstract
The toxicity and instability of lead-halide perovskite materials in the solar cells are yet demands must be resolved to vie to find alternatives of free lead-based halide perovskites and double perovskite materials. Here we report on the experimental synthesis of a new family of lead-free inorganic halide double perovskites Cesium copper antimony chloride (Cs2CuSbCl6) and perovskite Cesium copper chloride (CsCuCl3) as a based sensitizer of the solar cells and studies of its characterize and optical properties of the Photo-Voltaic (PV) device. The configuration structural of PV devices is (FTO/TiO2/CsCuCl3 or Cs2CuSbCl6/Cu2O/Al electrode). The double perovskite Cs2CuSbCl6 and Perovskite CsCuCl3 are successfully synthesized, performed of structural investigations by X-ray diffraction, and depicted of optical properties via optical absorption of UV−vis measurement. The perovskite (CsCuCl3) belongs to the space grope P6122 and the Hexagonal structure phase. The strongest peeks of the XRD diffraction pattern of the double perovskite Cs2CuSbCl6 are taken at the reflection points (-201), (-202), (-3-11), (220), (-223) and (-5-34). From UV−vis measurements obtained values of a direct gap of both (Cs2CuSbCl6) and (CsCuCl3) are (1.5 and 2.2) eV, respectively. The optimum power conversion efficiency (PCE) of the PV device which used Cs2CuSbCl6 as a sensitizer is 0.94%, the filling factor is 24%, the open-circuit voltage is 582.5 mV and the short circuit current was 2.656 mA. The measurement is carried out under one sun intensity illumination (1000 W/m2).
Investigation and characterization of coating and carburizing AISI 1011 steel
Authors: Abdulrazzaq Jabbar Diyar , Kadhim Zeyad Doshan 
Published: March 2020

Abstract
In this research work, the effect of coating layer thickness of nickel, which electrodeposited on low carbon steel AISI (1011), on mechanical properties has been studied. It also studied the mechanical properties of the carburized alloy at 950˚C at the time of carburizing five hours. It was found that fatigue strength for this alloy increased as thickness of the nickel-coated layer increased. Also, the carburized specimen has a fatigue strength higher than the untreated metal. The metal that was treated with the carburizing process and nickel plating for 15 minutes has the best fatigue strength. The fatigue strength improvement against non-plated specimens was between 3.93% and 16.87 % . Furthermore, hardness of metal increased for specimens treated with electrodeposition, and it became 219.7 Hv for metal coated with nickel at 15 minutes and had a coated layer of 20.42 µm. The hardness value became 431.65 Hv for carburized alloy treated with plating for 15 minutes. However, there was an improvement in the surface roughness due to electroplating.
Face Recognition using Hybrid Methods of Transformation and Statistical Measures
Authors: Ali Ameen Hayder , Noori Hashim Asaad 
Published: March 2020

Abstract
One of the most interesting problems and challenging issues within the pattern recognition computer vision is face recognition. Face recognition has gained special attention in the past few years due to its importance in relation to current applications such as security, forensic analysis, and surveillance systems. The whole system can be explained as the follows, after pre-processing, the first step is edge detection for the input image using the proposed filter, the second step is extraction the matrix of the Local Ternary Pattern (LTP) of the input image, the third step is capturing the features based on The Singular Value Decomposition (SVD). Fourth, extracted features are merged into a single vector. Finally, the matching has been performed between the features stored at the database and the features of the reference (test) image. The Proposed System has been applied to the variety databases. In the proposed system, the recognition ratio is 98% using city block distance and 98.5% using Structural Similarity (SSIM) as a classification method, the ORL ( AT&T) database is used.
Investigating the effect of post weld heat treatment on corrosion properties of explosive bonded interface of AA5083/AA1050/SS 321 tubes
Authors: Shargh Safarali Feleh , Saadat Abbas , Najafi Abolhassan , Gharehshiran Mohammad-Reza Khanzadeh , Khalaj Gholamreza 
Published: March 2020

Abstract
The corrosion behavior and microstructural changes in explosively welded AA5083/AA1050/SS 321 multilayer tubes after heat treatment were studied. Heat treatment were performed in 350 and 450 °C for 6 and 8 h. Microscopic results indicated significant changes in the thickness and concentration of alloying elements in locally melting zone with heat treatment temperature. According to electrochemical tests results at samples interfaces, by increasing the temperature and time of the heat treatment process, the energy stored due to explosive welding is reduced, the difference in the concentration of aluminum related to steel in the interface layer decreases, and the corrosion rate (current density) and electrical charge transfer decrease.
Spray pyrolysis of graphene oxide based composite for optical and wettability applications
Authors: Alkhafaji Abdulkareem A , Khaleel Imad H , Miran Hussein A 
Published: March 2020

Abstract
In this study, silica-graphene oxide nano–composites were prepared by sol-gel technique and deposited by spray pyrolysis method on glass substrate. The effect of changing the graphene/silica ratio on the optical properties and wetting of these nano–structures has been investigated. The structural and morphological properties of the thin films have been studied by x-ray diffraction spectroscopy (XRD), field emission scanning electron microscope (FESEM), energy dispersive x-ray spectroscopy (EDS) and atomic force microscope (AFM). XRD results show that silica structures present in the synthesized films exhibit amorphous character and there is a poor arrangement in graphene plates along their accumulation directions. The relationship between the contact angle of the water drop and the surface of thin films was analyzed by surface roughness. The results show that the contact angle is also decreased by decreasing the surface roughness. Absorption and transmittance spectra obtained from (UV–vis) of the studied films were used to compute and determine some optical parameters such as absorption coefficient, transmittance rate, optical gap, refractive index and extinction coefficient of the films. The calculated optical band gaps of films decrease by increase the silica contents in these structures.
Controlling oil/water separation using oleophillic and hydrophobic coatings based on plasma technology
Authors: Agarwal Anurag , Manna Soumyadeb , Nath Swaraj , Sharma Kanhaya , Chaudhury Pubali , Bora Tanujjal , Solomon Infant , Sarma Arun 
Published: March 2020

Abstract
Disposable and highly efficient device that can separate oil from water is in high demand. This work reveals the concept of oil/water separation using plasma technology. Copper coated, oxygen plasma-treated mesh has been used to separate oil and water from its mixture. At some critical conditions, the prepared coated mesh showed hydrophobic and oleophilic behavior. The coated mesh was used to separate the oil-water mixture, which allowed the oil to pass through, while it repelled water completely. The designed coated mesh maintained separation efficiency as high as 99 percent. Properties of coated and uncoated mesh were examined using various techniques and analyzed to understand the physical changes.
Corrosion behavior of lithium silicate-based Zn-5.5Al-4.5Mg-0.3Ce coating
Authors: Han Shaoguang , Shen Chengjin , Zhou Shuzheng 
Published: March 2020

Abstract
The effects of Ce on the microstructure of Zn-5.5Al-4.5Mg alloy and the corrosion mechanism of Zn-5.5Al-4.5Mg-0.3Ce alloy and its coatings were investigated in this research. The results show that the structure of Zn-5.5Al-4.5Mg-0.3Ce alloy is composed of hcp-Zn, fcc-Al and ternary eutectic structure (Zn/Al/MgZn2/Mg2Zn11), without dendritic tissue and MgZn2. The salt spray corrosion performance of Zn-5.5Al-4.5Mg-0.5CMC-2C coating was significantly better than that of Zn-5.5Al-4.5Mg-0.3Ce coating and Zn-5.5Al-4.5Mg-0.5CMC coating. The corrosion current density of Zn-5.5Al-4.5Mg-0.5CMC-2C coating was 3.217 μA cm−2, which was significantly lower than 3.96 μA cm−2 of Zn-5.5Al-4.5Mg-0.3Ce alloy and 5.879 μA cm−2 of Zn-5.5Al-4.5Mg alloy. Sodium carboxymethylcellulose and graphene improve the film formation and electrical conductivity of water-based lithium silicate resin. During corrosion of Zn-5.5Al-4.5Mg-0.3 Ce series alloy and coatings, Zn and Mg2Zn11 dissolved preferentially to form corrosion products of Zn5(OH)6(CO3)2 and Zn5(OH)8Cl2·H2O. Mg6Al2(OH)16CO3·4H2O and Zn4Al2(OH)12CO3·3H2O bimetallic hydroxide colloidal membranes were formed, which attached and wrapped on the surface of early corrosion products. Mg6Al2(OH)16CO3·4H2O and Zn4Al2(OH)12CO3·3H2O, preventing the dissolution of soluble corrosion products, improved the corrosion resistance of Zn-5.5Al-4.5Mg-0.3Ce alloy.