bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigating the impact of supply chain management on the performance of manufacturing industries in Sierra Leone: case study of Sierra Leone bottling company (SLBC)
Authors: Kamara Alimamy , Nyoman Pujawan I 
Published: May 2020

Abstract
Supply Chain (SC) is a series or network of companies who work collectively to make and deliver products and services to end-users. SC has become an important way of gaining competitive advantage and a way of improving companies’ performance. The impact of supply chain management (SCM) on the performance of manufacturing industries is very important in gaining competitive advantage. A weakness in SCM has a negative impact on the profit and can seriously affect the production and delivery of products. This research conceptualizes and develops four main dimensions to improve the performance of SLBC on Strategy and design, enabling infrastructure, process, and performance. To investigate the impact of SCM on the performance, this research employed descriptive data which was tested base on the available data through the use of software packaging for social scientists (SPSS) and Minitab. From the results, Process was found to have a strong correlation with performance (0.821), enabling infrastructure and performance (0.596) which shows that there is a cordial relationship between the variables. Also, performance has the highest mean (4.0760) which indicate it output factors have a very great impact on profitability, productivity and the entire performance. The company faced several setbacks in achieving its goals.
Self-propagating high-temperature synthesis of ceramic composite material based on Al2O3 - SiO2 - ZrB2
Authors: Chizhikov A P , Bazhin P M , Stolin A M 
Published: May 2020

Abstract
The present work is devoted to the production of a ceramic composite material in the mode of self-propagating high-temperature synthesis from a mixture of powder reagents: ZrO2, Al, SiO2, B, and Zr. The adiabatic combustion temperature was calculated for the stoichiometric composition of ZrO2-Al-SiO2 and for compositions with the addition of an energy additive from powders x (Zr + 2B), where x e [10-30] wt. %. It was found that an increase in the fraction of Zr + 2B leads to the refinement of structural elements. An increase in its content to 30 wt. % leads to the formation of nanoscale structural components in the material. As a result of varying the initial composition, a ceramic composite material based on Al2O3-SiO2-ZrB2 was obtained containing an oxide matrix with particles of zirconium diboride distributed from 61 to 77 wt. %. It is shown that as a result of the SHS of the selected compositions, mullite is formed. Using SEM, EDS and XRD methods, we studied the structural features and phase composition of the materials obtained.
Modification of barium aluminosilicate glass-ceramics with zirconium oxide additives
Authors: Chaynikova A S , Kovaleva V S , Zabelin D A , Belachenkov I O , Modin S Y 
Published: May 2020

Abstract
Barium aluminosilicate glass-ceramics modified with zirconium oxide (ZrO2) in the presence and without of stabilizing yttrium oxide was synthesized by the sol-gel method. The influence of the concentration of zirconium oxide on gelation, phase formation and sintering of materials were investigated. It was found that modification with zirconium oxide leads to a reduction in the gelation time of the initial solutions. It was shown that the introduction of ZrO2 in an amount of up to 10 wt.% leads to the intensification of sintering of glass-ceramics. However, with a further increase in the ZrO2 content to 15 wt.%, it is necessary to increase the sintering temperature to 1600°C. But this is not permissible, since it leads to not a desired metastable phase – hexacylsian becoming predominant in all samples. Only glass-ceramics modified with 10 wt.% ZrO2 contains only the monocelsian phase in the entire sintering temperature range. The use of the sol-gel method made it possible to synthesize glass-ceramics with a fine-crystalline structure and a uniform volume distribution of ZrO2 grains.
Functional properties and microstructure of TiNi alloy during multiple martensitic transformations
Authors: Churakova A A 
Published: May 2020

Abstract
The influence of multiple martensitic transformations on the functional properties and microstructure of the equiatomic TiNi alloy is considered. An analysis of mechanical tests showed that in the CG and UFG state in the Ti50.0Ni50.0 alloy as a result of thermal cycling with an increase in the number of cycles, a monotonic increase in the yield strength is caused by phase hardening. Moreover, in the UFG state, the yield strength increases by 185 MPa, which is 67.5 MPa more than the increase in σYS in the CG state. In this case, ductility remains at the level of 40%, which is somewhat lower than ductility in the CG state (∼ 60%). The phase yield stress and the estimated reactive stress of the CG and UFG states as a result of the TC also increase, with σreac UFG reaching 830 MPa. The increase in the yield strength of the CG state in an overgrown alloy is 113 MPa, while in the UFG it is 155 MPa, in addition, an increase in the estimated reactive stress and the reversible deformation with an increase in the number of thermal cycling cycles.
Gradient structure formation in titanium alloys using thermohydrogen treatment technology
Authors: Skvortsova S V , Gvozdeva O N , Shalin A V , Stepushin A S 
Published: May 2020

Abstract
This paper shows the possibility of creating a “linear gradient” structure, which varies from finely dispersed globular grains to coarse lamellar ones over the cross section of a 13-mm semi-finished product of VT6 alloy, using the thermohydrogen treatment method. The formation of the oxide layer and the depth of oxygen penetration were studied depending on the heating temperature and duration of treatment. The oxide stability was assessed during subsequent annealing in vacuum. It was established that the only oxide film which provides protection from hydrogen penetration during hydrogenous annealing at 800 ° C, was formed during heat treatment at 900°C for 4 hours.
Technology of spark plasma sintering as an innovative solution of synthesis high-density of SiC ceramics
Authors: Kardashova G D 
Published: May 2020

Abstract
The main advantages of spark plasma sintering (SPS) method compared to the classical hot pressing method for obtaining high-density ceramic based on silicon carbide are presented. Shows the perspective of obtaining a wide range of materials using this method. The possibilities of technology of spark plasma sintering of multicomponent ceramics based on silicon carbide of different composition have been studied. Established optimal SPS modes for sintering multicomponent ceramics of composition SiC (75%) - 22% (AlN) -Y2O3 (3%) (1800 °C/50MPa/15 min) provide formation of 100% dense composite, which allows to recommend these modes for making light and high-density ceramic material of specified composition with predicted properties.
Rheological properties of Si3N4 and Si3N4 with sintering additive CaO-Al2O3 powders
Authors: Kim K A , Lysenkov A S , Titov D D , Gumennikova E A , Frolova M G , Lemeshev D O , Perevislov S N , Kargin Yu F 
Published: May 2020

Abstract
In this paper were considered the rheological characteristics of Si3N4 powders and the mixture of Si3N4 powders with sintering additive based on CaO-Al2O3. The dependence of optimal density on the applied stress during pressing was established. The powders compressibility coefficients were studied. It was shown that upon addition of a sintering additive CaO-Al2O3 the compressibility coefficient decreases and the compressibility modulus increases.
The effect of homogenizing annealing on the microstructure and microhardness of Ti-20Nb-(7.5-10)Ta alloys (at.%)
Authors: Konushkin S V , Yu Ivannikov A , Nasakina E O , Sergienko K V , Shatova L A , Sevostyanov M A 
Published: May 2020

Abstract
The microstructure and microhardness of Ti-20Nb-7.5Ta and Ti-20Nb-10Ta alloys (at. %) after smelting and after homogenizing annealing at 900°C and 950°C for 12 hours were studied. It was shown that, after smelting, the alloys have a dendritic structure, and after annealing, they have a polycrystalline structure with equiaxed grains. It is also shown that annealing leads to an increase in the microhardness of alloys.
Fabrication and characterization of 1, 5, 10 at.% Ce:Y2O3 nanopowders
Authors: Lukyashin K E , Chepusov A S , Solomonov V I 
Published: May 2020

Abstract
Nanopowders (particle size of about 7-14 nm) of yttrium oxide doped with cerium ions with concentrations of 1, 5, 10 at.% have been synthesized by laser ablation of the target. For the first time in the world the cerium concentration of 10 at.% in the yttrium oxide lattice has been obtained. Their morphology, structure, and scintillation properties have been investigated. No significant cathodoluminescence of the activator in the Ce3+ state has been detected in the powders, and X-ray luminescence was completely absent. Presumably, the cerium ion is in the nonradiative state of Ce4+.
Hardness and fracture-toughness of hot-pressed LaB6-TiB2 ceramics
Authors: Nesmelov D D , Novoselov E S , Lysenkov A S , Vikhman S V , Perevislov S N 
Published: May 2020

Abstract
Microstructural analysis and investigations of mechanical properties via indentation-techniques have been performed on a LaB6 - 15 vol. % TiB2 ceramics, obtained by the hot-pressing at T = 1900 °C and P = 30 MPa in argon gas. The relative density of hot-pressed material was up to 97% of theoretical. XRD, SEM and EDX analysis of ceramics were performed. The Vickers hardness (18.5 GPa) and fracture-toughness (3.9 MPa-m1/2) were compared with the values, measured on a single-crystalline LaB6 (Hv = 21 GPa, KIc = 2.4 MPa-m1/2) and arc-melted eutectic composite LaB6-TiB2 (Hv = 23 GPa, KIc = 6.7 MPa-m1/2).
Hard radiation of reological explosion
Authors: Oparina I B , Shienok V V 
Published: May 2020

Abstract
The paper presents the results of experimental research of hard radiation going with reological explosion of solid bodies at the Bridgman’s anvils. The results of experiments gives evidence of electromagnetic character of radiation as in process of explosion, as after it. The energy of quanta of radiation, going with explosion was less, than some tens of keV and was less then some hundreds of keV in case of afterglow.
Silver niobate doped lead-free perovskite KNN ceramics
Authors: Politova E D , Kaleva G M , Golubko N V , Mosunov A V , Sadovskaya N V , Kiselev D A , Kislyuk A M , Ilina T S , Yu Stefanovich S 
Published: May 2020

Abstract
Influence of AgNbO3 doping on structure, microstructure, dielectric, ferroelectric and local piezoelectric properties of (K0.5Na0.5)NbO3 ceramics was studied. Decreased in the unit cell parameters correlated with ionic radii changes. High effective local d
33 piezoelectric coefficient values (800 pm/V) were observed in compositions studied.
Tunable parallel plate waveguide array based on VO2 thin films
Authors: Polozov V I , Maklakov S S , Maklakov S A , Chistyaev V A , Politiko A A , Baskov K M , Mishin A D , Petrov D A , Kisel V N 
Published: May 2020

Abstract
Vanadium dioxide (VO2) is a material with a metal-insulator phase transition. We report a way of application of VO2 thin films as functional elements of reconfigurable parallel plate waveguide array (PPWA). The PPWA presented here is designed to work in X, Ku and K bands. A transmission coefficient of the array with VO2 elements can be altered using temperature by more than 10 dB across the entire experimentally studied frequency range. We demonstrate a method of design and manufacturing of the PPWA. The PPWA may be used as a basic component in more advanced reconfigurable devices.
Precision human bone prototypes manufactured by 3D printing for training and experimental studies
Authors: Romanov I D , Romanov A D , Kulinchenko N A , Gorbatov R O , Klenin A A 
Published: May 2020

Abstract
The work shows the possibility of using additive technologies using 3D printing to build anatomical structures of a person using data of a computer-tomographic examination allows to create precision models taking into account external and internal structure of a biological object.
Modeling of paths and energy losses of high-energy ions in single-layered and multilayered materials
Authors: Tishkevich D I , Grabchikov S S , Grabchikova E A , Vasin D S , Lastovskiy S B , Yakushevich A S , Vinnik D A , Zubar T I , Kalagin I V , Mitrofanov S V , Yakimchuk D V , Trukhanov A V 
Published: May 2020

Abstract
Modern electronic systems and equipment used in aerospace and nuclear technology, as well as many scientific and medical devices, are used under the influence of a wide range of ionizing radiation (electrons, protons, heavy charged particles etc.). Protons or heavy charged particles exposure can lead to failures in the operation of spacecrafts electronic devices, which is associated with the radiation effects occurrence in an integrated circuits. One of the most effective ways to solve this problem is protection by radiation shields. Linear and mass paths of protons and Ar+ ions in Al, Al2O3, Bi, and W77, 7Cu22, 3 composite shields were calculated using a SRIM software package. It is shown that the protection efficiency against high-energy ions by materials with large atomic charge values (Z) is higher from the position of linear ranges of particles, and lower from the position of mass ranges than materials with low Z values. The dependence of the threshold energy on the serial number of particles for Al, Bi and W77, 7Cu22, 3 composite shields is determined. The effect of the sequence in the arrangement and layer thicknesses in the Bi/Al/Al2O3 multilayered structures on the protection efficiency against high-energy ions was studied.
Preparation and researching the properties of organic aerogels based on epoxy resins
Authors: Voytik A E , Malkov G V , Kapasharov A T , Knerelman E I , Yu Kostin A 
Published: May 2020

Abstract
The aim of this work was to develop methods for the synthesis of organic gels based on epoxy resins and the production of their aerogels. In general, aerogels are obtained from gel samples that consist of a high-molecular spatial network and a low-molecular dispersion medium - solvent. Various drying methods are used to remove liquid from gel pores, the most reliable of which, allowing to obtain samples of aerogels with undamaged spatial structure, is drying in supercritical fluid medium. As a result of the work the aerogels of different density were obtained, the dependence of density on the solvent content in the samples was revealed. The obtained aerogels were characterized by density, studied by infrared spectroscopy to assess the degree of polymerization of the resin, as well as using the BET method to determine the specific surface area of the samples and obtain its dependence on the catalyst content and curing conditions.
Kinetic Study of Steam Gasificaiton of Palm Kernel Shell Char
Authors: Lerkkasemsan Nuttapol 
Published: May 2020

Abstract
In this work, we investigate the reaction mechanism of steam gasification reaction of palm kernel shell char. The experiment results which are used in this work are carried on at temperature of 1123, 1173, and 1223K. The isothermal steam gasification of palm kernel shell char is described by mathematic models including volumetric model (VM), grain model (GM), random pore model (RPM), and modified random pore model (mRPM). From results, we found that the RPM model can predict gasification of palm kernel shell char better than other models. The RPM model considers the overlapping of pore surfaces, which results in the reduction of surface area available for the reaction. The activation energy of gasification reactivity of palm kernel shell char is 152.63 kJ/mol for RPM model. The coefficient of determination of RPM model are 0.9920, 0.9995, and 0.9907 at 1123, 1173, and 1223 K respectively.
Accounting of data uncertainty in advanced technological models of design calculations of acoustoelectronic components from piezoelectric materials
Authors: Storozhev S V , Storozhev V I , Bolnokin V E , Mutin D I , Mutina E I 
Published: May 2020

Abstract
A numerical-analytical theoretical technique for taking into account the influence of scatter errors of the experimental values of initial parameters when studying the propagation characteristics of bulk electroelastic waves in anisotropic piezocrystalline and piezoceramic media based on models that take into account the coupled mechanical deformation and electromagnetic interactions is presented. The analyzed problems to the development of advanced design solutions for creating components of acoustoelectronic devices wish required the receipt of the most reliable estimates for the velocities and amplitude attenuation parameters of wave information signals are related. The developed approach is based on the transition in the ratios of deterministic models of the propagation of electroelastic waves in piezoelectric materials to fuzzy-set arguments by phased fragmented application of methods of fuzzy-interval arithmetic’s and of the use of heuristic generalizations principle in the alpha-level form. Examples of application of the developed calculation methodic are presented.
Structure and wear resistance of Fe-Cr-Mn-C-N coating obtained by electron beam overlay welding
Authors: Narkevich N A , Panin V E , Durakov V G , Shulepov I A 
Published: May 2020

Abstract
The coating produced by electron beam overlay welding of a nitrogen alloyed austenitic steel (24.40Cr, 16.40Mn, 0.18Ni, 1.1Si, 0.57C, 0.70N, and bal Fe (in wt.%)) is investigated. Electron beam overlay welding is performed by a continuous low-energy (27 keV), low-current (0.02–0.04 A) focused electron beam using electron beam setup (ISPMS SB RAS, Russia) with a residual pressure of 0.1 Pa. This paper examines microstructure, phase composition, chemical composition of the coating by OM/AES/XRD/SEM/EDS methods. The obtained coating is pore-free and exhibits high work hardening characteristics. Friction loads induce the γ;→α′ transformation in the wear process. With increasing friction loads, the friction coefficient decreases.
Application prospects of ASM 4603-SA surfacing material modified with hard-melting components for reconstruction of rollers for continuous casting machines
Authors: Makarov A V , Kudryashov A E , Vladimirov A A , Titova A P , Avdeeva N E 
Published: May 2020

Abstract
The results of researches aimed at studying the possibility of using ASM 4603-SA surfacing material modified with hard-melting components, namely tungsten carbide and boron nitride hexagonal, for reconstructing the rollers of continuous casting machines by electric arc surfacing are covered. It is shown that such material has higher wear resistance in comparison with the surfacing flux-cored wire 25Cr5VMoSi, as well as high resistance to cracks formation and net shaped marks as a result of cyclic high-temperature influences.
Influence of leakage on characteristics of the vacuum transport unit based on the water-ring pump
Authors: Naumov V A 
Published: May 2020

Abstract
The mathematical model of the liquid pumping process using the autonomous vacuum transport unit based on the water-ring pump is proposed. Such units are used, in particular, for pumping aggressive liquids. The performance characteristics of ERSTVAK’s ELRS-2 water-ring vacuum pump were used in the calculation. The system of differential equations was solved numerically. An increase in the leakage coefficient leads to a raising the absolute pressure in the tank at the end of the first stage. As a result, the volume of liquid pumped in one cycle is noticeably reduced. Therefore, the average performance and efficiency of the unit is significantly reduced. The duration of one cycle changes slightly
Features of planning an automated production line of manipulator-type machines
Authors: Shabashov A A 
Published: May 2020

Abstract
Features of the development of automated processing of parts of manipulator type machines are considered. Optimization of the solution of transport problems leading to a change in the production structure of the enterprise, a change in the specialization forms of its workshops and production sites, a change in freight flow patterns, freight turnover values and associated transport and process schemes for handling unit loads are presented. All these transformations of transport and process schemes result in a change in the general plan of the enterprise, layout schemes of its production buildings, workshops and production sites and other changes in the production and organizational structure. A more detailed solution of the problem of determining the optimal routes in a lean production system is the optimization of process routes at the level of developing routing maps of technological processes for manufacturing each part of the product and assembly processes. Relying on key business processes and organizing assembly production on new principles, the enlarged planning of the production process made it possible to design a modern production module.
An experimental study of the location of the grid bars cells installed under spiked cylinders in a cotton cleaner from small waste
Authors: Rajabov O I , Abrorov A S , Mirzaqulova N I , Zaripov G B , Ziyodullaeva Kh S 
Published: May 2020

Abstract
The article presents materials of experimental studies on the installation of the grid bars surface of a cotton cleaner - raw from small waste. In this case, the grid bars surface is mount perpendicularly, parallel to and at an angle of 45° relative to the center of rotation of the spiked cylinders. The research results of all options are analyzed in the form of a histogram. The experiments were conduct on breeding varieties of cotton - raw “Bukhara-6”, “Namangan-77”.
Application of thermal effect as a means to combat ground-and-machine part adhesion
Authors: Zenkov S A 
Published: May 2020

Abstract
The main cause of the efficiency decrease in productivity of earthmoving machines is the adhesion and friction increase during the development of wet bonded soils under freezing point. This problem exists both in Russia and abroad. When developing frozen clay and wet soils operational winter, the bucket filling and the excavator speed is much lower in winter than in summer. Wet soil, contacting with cooled walls of the bucket, quickly freezes to them, reducing the useful capacity of the bucket and makes unloading difficult. The analysis of self-regulating heating elements has been reviewed. Three TM-40, TM-60 and SRL 30-2 heating elements are considered as possible options to use directly on the excavator bucket to loosen adhesive bonds by heating the working surface of the plant. The results of experimental research are presented, one-factor equations of plate heating temperature regression for each of the heating elements are presented, temperature-time characteristics of three heating elements are constructed, comparative analysis of three TM-40, TM-60 and SRL 30-2 heating elements is made.
Determining a numerical efficiency indicator for a mobile bricklaying robot
Authors: Malakhov A V , Shutin D V , Marfin K V 
Published: May 2020

Abstract
Evaluation of a technical solution in construction usually is based on technical and economic indicators. However, this approach does not always gives a full assessment. It does not take into account a number of factors accompanying the process of capital construction. In particular technical and economic indicators used for analysis of construction from blocks are based on regulatory documentation, namely, the cost and labor input per cubic meter of masonry. At the same time, the efficiency of labor is not taken into account. This article presents a model of numerical evaluation of the effectiveness of using a mobile bricklaying robot. This model takes into account variety of factors and allows you to more accurately assess the applicability of such a robot for the construction of a specific object.