bluuebunny/crossref_metadata_2025_split huggingface dataset:
Statistical software adoption behaviour among Indonesia’s undergraduate students
Authors: Zaitul  , Rizki Mulyani Sitti , Ridwan Muhammad , Ilona Desi 
Published: December 2019

Abstract
Technology usage among students is a must since revolution industry 4.0. However, there is a limited study about technology adoption among student. This study’s objective is to explore the influence of external factors on usefulness and ease of use the statiscal software. Besides, this paper also analyses the association between ease of use and usefulness on behavioural intention to use SPSS among accounting students. By extending technology acceptance perspective (TAM), this study develops eight hypotheses. Seventy-three accounting students were registered at subject of business research method in accounting department, Bung Hatta University, participated in this study. Structural equation model-path least square is used to analyse the primary data. The result shows that computer attitudes has a positive relationship with usefulness. In addition, SPSS self-efficacy also has a positive relationship with ease of use. Further, statistic learning value is positively related to usefulness. Finally, ease of use is positively related to behavioural intention to use SPSS. Out of eight hypotheses being developed, four hypotheses is supported and the rest is rejected. Theoretical and practical implication is discussed in this article.
Two Dimensional Object in square and rectangles: Batik artwork approach
Authors: Ambarawati Mika , Dwi Agustin Ririn 
Published: December 2019

Abstract
This study aims to describe the ethnomatematics study: square and rectangular on the motif of Malang batik artwork. This research is a qualitative-explorative research that is exploring batik motifs in square and rectangular shapes. The data in this study are in the form of library study data from both documents and electronic media. In addition, in the form of interview records related to Malang batik artwork and observations. The results of the study from this study indicate that: 1) on the kawung motif and Malang written batik there is a square concept; and 2) in Malang’s masked batik motif there is a rectangular concept. The concept of square and rectangle in Malang batik artwork can be applied in mathematics learning. Especially in two-dimentional figure material.
Construction of the renewable energy eco-system: strategic distributions along the chain of “photovoltaics-energy storage-electric vehicles”
Authors: Yang T , Yan D Z 
Published: December 2019

Abstract
The “photovoltaics (PV)-energy storage system-electric vehicles (EV)” industry is taken as an instance in this paper to depict the blueprint of the renewable energy eco-system: (1) As the headstream of the whole industry chain, clean energy source is first discussed. Taking full advantage of low cost in the photovoltaic lifetime, the highway PV plant is supposed to be a promising, cheap power supply for new energy vehicles, and to conduce to less traditional energy consumption and carbon emission. (2) Two-level energy storage systems, including power-grid energy storage and customer-side energy storage, would be established by developing novel energy-storage devices, high-capacity materials of EV batteries and standardization of battery manufacturing. Also, with the aid of “internet of things (IOT)”, a network of monitoring, maintenance, recycling and echelon utilization will be established to cover the EV batteries’ whole life. (3) As for the new energy vehicles, novel manufacturing standards will be formulated including modular design and production. Instead of the integrated battery modules, the exchanging mode will be applied to vehicle batteries, accompanying with the construction of the gas-station-like battery supply network, which provides power access and battery charging/exchanging/maintenance. In addition, it is also briefly described that hydrogen evolves from water electrolysis by utilizing surplus photovoltaic and wind power and serves as a significant supplement of the present electricity-dominant renewable energy industry. An ecology is hopefully formed through synergetically developing renewable energy supply, storage and applications in the following years. Thereafter, the energy consumption will be thoroughly changed via the construction of a fossil-fuel-independent new energy eco-system, supported mainly by renewable energy sources.
Mechanical and electrochemical properties of ultrafine hard alloys with different grain growth inhibitors
Authors: Terentev A V , Isaeva N V , Blagoveshchenskiy Yu V , Nokhrin A V , Murashov A A , Saharov N V 
Published: December 2019

Abstract
A 90WC-10Co powder mixture with TaC, VC and Cr3C2 grain growth inhibitors with average particle size about 50 nm was produced by deposition of Co. Two different sintering techniques had been used for consolidation. Microhardness and fracture toughness measurements of sintered materials had showed agreement with Hall-Petch equation. The corrosion behavior was investigated in neutral and acid solutions by electrochemical methods. The observed pseudo-passive transition had been associated with the so-called salt passivity — formation of cobalt sulfate salt layer on hard alloy surfaces.
Investigation of the effect of preliminary modification of solutions on the properties of precipitated hydrated zirconium oxides
Authors: Zhirenkina N V , Mashkovtsev M A , Obabkov N V , Buynachev S V , Kosykh A S , Aleshin D K , Vereshchagin A O , Kononenko A S 
Published: December 2019

Abstract
In this study, hydrated zirconium oxides and yttrium stabilized zirconia powders were synthesized by precipitation. Influence of preliminary solution modification, namely preliminary heating of the solutions and the addition of sulfate ions was investigated. It is shown that the addition of sulfate ions leads to a decrease in the size of aggregates and an increase in the specific surface area of the particles. The greatest increase in the specific surface area was observed during precipitation of a preliminary heated solution with the addition of sulfate ions.
The influence of immersion in buffer systems simulating body fluids on properties and morphology of octacalcium phosphate granules
Authors: Mikheeva P V , Teterina A Yu , Smirnov I V , Fedotov A Yu , Komlev V S 
Published: December 2019

Abstract
Octacalcium phosphate is the precursor of biological apatite, that is why it is of special interest in bone regeneration due to it’s biocompatibility and biodegradability. This study was performed to examine the in vitro stability of octacalcium phosphate granules in physiological solutions. Powder X-ray diffraction (XRD), infrared spectroscopy (IR), plasma atomic emission spectroscopy (AES) and scanning electron microscopy (SEM) data were obtained before and after granules immersion. The variation of Ca2+ and HPO4
2- concentration in the soaking solutions suggests that the material transformation occurs through octacalcium phosphate dissolution followed by hydroxyapatite precipitation.
Investigation of the catalytic properties in the dehydration of 1-phenylethanol in styrene process of an amorphous aluminum hydroxyl gel after its heat treatments
Authors: Mukhamediarova A N , Boretsky K S , Egorova S R , Lamberov A A 
Published: December 2019

Abstract
Styrene is the widely used as a monomer, which is produced by PO-technology using γ-alumina catalyst. It is mainly synthesized by the precipitation of aluminum nitrate solution by ammonia. However, amorphous aluminum compounds are formed after synthesis with pseudoboehmite, which is a precursor of the alumina. Therefore, the product of precipitation and the alumina derived by its heat treatment at the 550 and 750°C were synthesized and investigated. Starting product consists ∼86 wt.% of amorphous aluminum compounds and 14 wt.% of pseudoboehmite. These substances transform into amorphous alumina from and γ-Al2O3 (1) after calcination at 550°C and show low catalytic characteristics in vapor-phase of 1-phenylethanol into styrene. However, after heat treatment at 750°C, when amorphous alumina transform in γ-Al2O3 (2), the conversion, selectivity and styrene yield increase by 10-20%.
The study of the electrochemical properties of new electrochromic compounds based on 3-aryl-4, 5-bis (pyridin-4-yl) isoxazoles derivatives.
Authors: Chicheva P A , Chudov K A , Levchenko K S , Poroshin N O , Shmelin P S , Grebennikov E P 
Published: December 2019

AbstractElectrochemical and optical properties of a new class of electrochromic 3-aryl-4,5-bis (pyridin-4-yl)isoxazoles derivatives containing conjugated pyridine fragments were investigated comparing with their precursor 1,2-bis(4-pyridinyl)ethylene derivative. Electrochromic cells based on synthesized substances were reversibly colored in brown upon the application of a voltage of 1.5 V.
Heat resistance of basalt fiber enhanced by silicious-fluoric-PAA hybrid sizing agent
Authors: Wang Z T , Luo H J , He Q L , Jiang H 
Published: December 2019

Abstract
Basalt fiber, as a high strength and good temperature resistance inorganic material, has an excellent application in the high temperature filtration industry, but its strength retention decreases obviously with time going when baked at temperature above 300°C. This limits the range of its application as a filter material. In this paper, the sizing agent was prepared by mixing polytetrafluoroethylene, silane coupling agent, polyacrylate acid, polysilicic acid and polyurethane crosslinking agent in aqueous solution together, and then the surface of basalt fiber was coated by the sizing agent. The experiment results showed that the emulsion droplets formed in the aqueous solution had small particle size and good dispersibility. The initial decomposition temperature of the film formed by the sizing agent was 220°C. The initial tensile strength of the coated basalt fiber was 60% higher than that of the uncoated fiber at room temperature. The residual strength of the coated fiber was 6 times higher than that of the uncoated fiber when treated at 340°C for 10 hours.
Preparation of silicon carbide/copper composite by pressureless infiltration
Authors: Sang Kezheng , Liu Linjie , Song Xiaoheng , Zeng Dejun 
Published: December 2019

Abstract
SiC/Cu composite was obtained by pressureless infiltrating Cu into porous SiC ceramic modified by W coating. The influence of W coating on the process of pressureless infiltration, composition, microstructure, thermal conductivity and bending strength of the composites were studied. The results show that the SiC ceramic is obtained by oxidation sintering. The Sol and hydrogen reduction methods can be used for W metallization on the surface of holes in porous SiC ceramic, and small W particles of about 1 μm are evenly distributed on the surface of SiC particles in the ceramic. After the modification of the W coating, a complete infiltration of the Cu melt into the porous SiC ceramic can be achieved under a vacuum of 10-1Pa at 1350 °C. W particles react with SiC at high temperatures during the infiltration process, and WC particles are formed on the Cu-based alloy matrix. As the size of SiC particles increases from 10 μm to 150 μm, the thermal conductivity of the composite increases from 35 W / (m·K) to 45 W / (m·K), but the bending strength rapidly decreases from 200 MPa to 30 MPa.
Research and Development of Low-cost Titanium Alloys
Authors: Xin Shewei , Zhang Jingli , Mao Xiaonan , Zhao Yongqing , Hong Quan 
Published: December 2019

Abstract
Excellent mechanical properties combined with low density, good corrosion resistance and welding, make titanium alloy attractive structural materials for aerospace, ship navigation, weaponry and nuclear industry. However, the high cost impedes the further use of titanium alloy in different fields, and which is the key factor for productivity and further use of titanium alloy. Aiming at lost cost of titanium alloy, three parts of raw material, alloy design and working forming were overviewed, which will offer reference for how to low cost of titanium alloy.
Investigation of thermal stability of the structure and properties of ultra-fine-grained copper alloys obtained by ECAP
Authors: Chuvil’deev V N , Nokhrin A V , Kopylov V I , Melekhin N V , Shadrina I S , Piskunov A V , Smirnova E S , Lopatin Y G , Vostokov M M 
Published: December 2019

Abstract
The paper describes the results of experimental studies of the effect of small chromium additives on the temperature of recrystallization (TR) of ultrafine-grained (UFG) copper obtained by equal channel angular pressing. Our investigation shows that the process of recrystallization in UFG CuCr copper alloys has a three-stage character - anomalous grain growth at annealing temperatures not exceeding the temperature of chromium particles(Tann<T1), “fixation” of grain boundaries by the released particles (T1⩽Tann<T2), and regular grain growth at higher temperatures (Tann⩾T2), when grain boundaries “detach” from particles of the second stage. It also shows that an increase in the chromium concentration in UFG copper by 0.3-0.5wt.% leads to a decrease in the temperature of the onset of the migration of grain boundaries T1 in the UFG copper by 40-60°C and an increase in temperature T2 to ∼ 400°C. We discovered that low-temperature pre-recrystallization annealing contributes to an increase in the thermal stability of the mechanical properties of CuCr alloys.
GdBCO (123) HTS 2G tapes superconducting characteristics investigation under the pulsed electron beam exposure impact
Authors: Minaev I M , Troitskii A V , Ponomarev A V , Anischenko I V , Pokrovskii S V , Rudnev I A , Mikhailova G N 
Published: December 2019

Abstract
The 2nd generation composite HTS tapes samples based on the GdBCO (123) compound were irradiated in a pulsed electron accelerator (Terek-2 facility, IOF RAS) through a tantalum target to determine the thermal and shock loads effect at the tantalum-HTS boundary on the HTS tapes superconducting characteristics. Scanning Hall magnetometry was used to characterize the HTS samples after the electron irradiation exposure. The thermal modes and shock load in a composite superconductor under the irradiation influence are estimated depending on the magnitude of energy contribution to the target. At a silver surface temperature equal to the melting temperature, the critical current value drops by 87% of the initial value. At lower energy, a weaker critical current decrease was observed. The temperature effects and shock waves roles under the irradiation is discussed.
Creating a composite material ZnO-Bi2O3 with a core-shell structure for varistor ceramics
Authors: Shanenkova Yu L , Tsimmerman A I , Osokina L V 
Published: December 2019

Abstract
This paper discusses use of the plasma dynamic synthesis to obtain ZnO-Bi2O3 composite powder. This method allows to get the main ZnO material with the formation of core-shell particles. Sintering of ceramics from this material was carried out using spark plasma sintering facility. Use of this sintering method provides obtaining a fine-grained structure of ZnO (average grain size of 1.3 μm). Comparison of the current-voltage characteristics of ceramics from commercial and plasma dynamic materials showed promise of using a ZnO- Bi2O3 composite with a core-shell structure.
High-efficient solid-fuel combustion catalysts
Authors: Kuz’mina R I , Kovalenko E I 
Published: December 2019

Abstract
The process of catalytic combustion of solid fuels in the presence of manganese dicyclopentadienyl tricarbonyl was studied. The results of industrial tests have showed an improvement in the basic technical and economic indicators of the coal burning process (AH grade) and an increase in the boiler unit efficiency.
Polymer nanocomposites on the basis of low density polyethylene and dressed kaolin
Authors: Kakhramanov N , Kurbanova R 
Published: December 2019

Abstract
The influence of the organosilicon coupling agent — aminoethylaminopropyltrimethoxysilane — on the physicomechanical properties of nanocomposites based on a low density polyethylene and kaolin is considered. The kaolin nanoparticles with a size of 80-120 nm were obtained during the processing of the powdered mineral in a laboratory mill mark A-11 at a rotor speed of 30,000 rpm. The regularity of changes in the properties of the dressed polymer nanocomposites depending on the concentration of the filler and coupling agent is shown. For comparative analysis, composites with dressed and undressed filler were used. The results of the study showed that nanocomposites with dressed nanoparticles are characterized by relatively high values of ultimate tensile stress, elongation at break, and flexural strength. Only when the concentration of the filler is 20 wt.% and higher, there is a noticeable deterioration in strength and elongation at break of the composites. This is interpreted by the fact that in the process of crystallization and growth of spherulites most of the filler accumulates in the amorphous region which consists of a large number of “feed-through chains” determining the mechanism of formation of the “neck” under uniaxial tension. The increase in the proportion of filler particles in the inter-spherolite space is accompanied by the fact that the feed-through chains become “walled up” in amorphous space.
Composite materials based on fine-dispersed Al2O3 with enhanced physical and mechanical properties
Authors: Gevorkyan E S , Rucki M , Torosyan K S , Kislitsa M V , Gutsalenko Yu G 
Published: December 2019

Abstract
Ceramic nanocomposites of silicon carbide reinforced Al2O3 are obtained by electroconsolidation. Mechanical properties are investigated and their dependencies on the composition and consolidation modes are shown over a wide range. The optimal composition and modes of electrical consolidation for the Al2O3-SiC composite are revealed. A criterion for choosing a material for instrumental application, which takes into account the basic properties of the cutting tool, is proposed. Comparison of the obtained composites with similar materials used for the manufacture of tool products including global manufacturers has been carried out.
Tensile strength of carbon composite materials: Influence of binding matrix
Authors: Antanovich A A , Kolesnikov S A 
Published: December 2019

Abstract
The calculated estimates of the strength and deformation characteristics of carbon composite materials based on carbon fibers with polymer, carbon and carbon-ceramic matrices obtained by various technologies are presented. The calculation method is based on the structural model of the strength of the composite material as a “bound” beam of reinforcing fibers. Good agreement of the calculated data with the experimental results indicates the applicability of the calculation model used for the design of new materials and products. It is also shown that the isostatic technology of obtaining carbon matrices based on coal pitch allows to obtain carbon composites with properties closest to carbon plastics, which are characterized by the best ability to realize the strength of reinforcing fillers.
Al2O3−Y2O3−Cr2O3 ceramics based on organochromiumoxane yttriumoxane alumoxanes
Authors: Shcherbakova G I , Storozhenko P A , Varfolomeev M S , Blokhina M Kh , Krivtsova N S , Zhigalov D V , Ashmarin A A 
Published: December 2019

Abstract
Ceramic-forming organochromiumoxane yttriumoxane alumoxanes with various Al:Cr and Al:Y mole ratios have been synthesized by the co-condensation of chelated alkoxyalumoxanes, yttrium acetylacetonate hydrate and chromium acetylacetonate organic solvent. Pyrolysis of the synthesized organochromiumoxane yttriumoxane alumoxanes at 1500°C results in the formation of high-purity multicomponent ceramics of Al2O3−Y2O3−Cr2O3 composition; said ceramics was studied in detail by X-ray analysis.
Physical and chemical properties of composite (Mo1-xNbx)Si2
Authors: Danilin K D , Titov D D , Lysenkov A S , Kargin Yu F , Fedorov S V , Miloserdov P A 
Published: December 2019

Abstract
In this study, the effect of NbSi2 in the range from 10 to 90 wt% was investigated. on the properties of composites (Mo1-xNbx)Si2 obtained by hot pressing a solid-phase mixture of molybdenum and niobium disilicides at a temperature of 1700°C. Graphs of the dependence of density, bending strength, electrical resistivity, CLTE and microhardness of the content of NbSi2 were obtained. It was found, that with an increasing level of NbSi2 in the content, the flexural strength drops to 130 MPa. The electrical resistivity depending on the content of niobium silicide is extreme with a maximum for the composition (Mo0,5Nb0,5)Si2. In the concentration range of NbSi2 20-100 wt.% CLTE and microhardness of the composite within the error does not change.
Preparation of foamed aluminum and its application in China
Authors: Luo Hongjie 
Published: December 2019

Abstract
As a new structural material combined with functional characteristics, aluminum foam possesses low density, high specific surface area and stiffness, good sound and energy absorption, as well as excellent electromagnetic shielding. Among the preparation ways which can be used to fabricate aluminum foam, the methods, such as direct foaming in aluminum melt, melt foaming by gas injection, powder metallurgy route and casting around space holder materials, may be the main ones. The R & D of the methods above in China is discussed in this paper. Aluminum foams have been exploited in road noise barrier, buildings, rail transit vehicles, aerospace and bridge protection in China nowadays. The applications of aluminum foams obtained by some methods are also emphatically described. It is speculated that the application fields and amount of the aluminum foams may be increased in the future along with the further development of Chinese economy.
Comparison of mechanical properties of zirconia crystals partially stabilized with yttria and gadolinia
Authors: Chislov A S , Borik M A , Kulebyakin A V , Lomonova E E , Milovich F O , Myzina V A , Parkhomenko Yu N , Ryabochkina P A , Sidorova N V , Tabachkova N Yu 
Published: December 2019

Abstract
(ZrO2) 0.97(Y2O3)0.03 and (ZrO 2)0.97(Gd2O3)0.03 solid solution crystals have been grown using directional melt crystallization in cold container. The structure and phase composition of the crystals have been studied using X-ray diffraction and transmission electron microscopy. The mechanical properties of the crystals e.g. microhardness and fracture toughness have been studied with microindentation. We show that the main hardening mechanism in the 3GdSZ and 3YSZ crystals is transformation hardening. No microhardness anisotropy has been observed in the crystals. The highest fracture toughness among the crystals has been obtained for the 3GdSZ crystals in the {100} plane.
Optimization of the phase composition of hard alloys obtained by spark plasma sintering of powders WC + 10% Co
Authors: Smetanina Ksenia E. , Andreev Pavel V. , Malekhonova Natalia V. , Lantsev Evgeny A. 
Published: December 2019

Abstract
Parameters of powder WC + 10% Co sintering modes that exclude the possibility of η-phase (Co3W3C) formation were determined. The phase composition was controlled by introducing colloidal graphite into the original powder.