bluuebunny/crossref_metadata_2025_split huggingface dataset:
Gamelan as a Learning Media Speaking Skills to Indonesian Language Students For Foreign Speakers (BIPA)
Authors: Riyanti A , Zuchdi D , Nurhadi  
Published: December 2019

Abstract
This research was written with the aim of describing the use of gamelan media for speaking skills learning in the form of descriptions for A3 level BIPA students at the Indonesian Institute of Arts, Yogyakarta. The method used in conducting research is a qualitative descriptive research method, with observation data collection techniques, questionnaires, interviews, and documentation. Based on the results of the study, it was found some errors in mentioning the type of gamelan and found the benefits of using learning media in the form of gamelan in speaking competency learning in the form of descriptions for BIPA students at the Indonesian Art Institute, Yogyakarta. This gamelan learning media can also be used as a means of promoting culture in sociocultural aspects. The results of this study are (1) students feel motivated in participating in learning, (2) increased curiosity about Indonesian culture; (3) facilitate students in describing something because they see directly the object to be written; (4) strengthen the memory of BIPA learners on a vocabulary and concept because the media is iconic; (5) learners are more active in exploring the media; (7) through gamelan media, Indonesian culture can be recognized by foreigners; (8) increase vocabulary understanding and mastery, and (9) learning becomes more meaningful.
Multimedia-Based online Test on Indonesian Language Receptive Skills Development
Authors: Sudaryanto M , Mardapi D , Hadi S 
Published: December 2019

Abstract
The need for computer-based assessment provides an opportunity for test takers to maximize performance in solving questions prepared to their measure language skills. Specifically, this study develops receptive skill tests, i.e. listening, reading, and skills competency responding to the rules. Instruments were tested on the test participants who are elementary level students who join Indonesian language courses. The items were analyzed by Rasch model to determine the level of item difficulty. The results showed that the level of difficulty of the items in the normal distribution in accordance with the ability of test participants. Qualitative analysis shows (1) the weaknesses of using Google-form as a receptive skill test tool, such as connection and unstable internet signal even though tested at college level, test takers still record simultaneous material, the search tool used is not qualified hampering the testing process, (2) the advantages of using Google-form as a receptive skill test tool are there is no need to wait for late test takers, test takers have no chance to cheat and it is paperless, (3) the importance of determining starting point and test rules other. The conclusion of this research is the effectiveness of using Google form as a multimedia-based receptive skill tool capable of minimizing the testing procedure.
Student’s cognitive conflict form problem solving on mathematics
Authors: Halimah  , Subanji  , Septi Nur Afifah Dian 
Published: December 2019

Abstract
This study aims to describe the cognitive conflicts of male and female students in mathematical problems solving. This research is a qualitative research with a descriptive approach. Data collection methods include tests, interviews, and documentation. The subjects of this study were 1 male and 1 female student selected from 6 samples consisting of 3 male students and 3 female students using purposive sampling technique. Data analysis techniques used are data reduction, data presentation, and conclusion. The results of the study showed that students experienced cognitive conflict when solving the problem of constructing a flat circle. This is indicated by the attitude of doubt and anxiety experienced by students in answering questions. In addition, the occurrence of errors and misconceptions in students when solving problems where students can not distinguish the concept of circumference and broad concepts in the flat circle. Therefore, it is better that in the learning process students not only memorize formulas, but students must understand the concepts in depth. In addition, teachers also need to pay more attention to male students in the learning process because male students experience cognitive conflict more often than female students.
Statistic problem solving based on cognitive style: statistically thinking
Authors: Qomariyah U N , Juniati D , Siswono T Y E 
Published: December 2019

AbstractStatistical thinking is fundamental for humans’ live, particularly to help them make careful and thorough decision. Besides, it makes them change the ways they apply from traditional to scientifically rational manner. Therefore, teaching statistics since elementary school is necessary. Based on the curriculum of mathematics in Indonesia, statistics is first introduced in the 6thgrade of elementary school. However, some studies suggested that the lower graders were found successful in solving statistical problems. This study aimed to investigate the statistical thinking of an elementary female student in terms of her cognitive style. A qualitative approach was selected to describe students’ statistical thinking in detail. The result found that a female student with field-independent cognitive style solved a statistical problem by several procedures, including: identifying data, describing and displaying data, organizing and reducing data, representing data, analyzing data, and making conclusion. Representation by a field-independent female student allowed her to make a comprehensively contextual response between the data on table and on bar chart.
The Effectiveness of Mathematic Learning Materials Based on Contextual Teaching and Learning
Authors: Anang Taufik Mohammad , Mulyoto  , Sunardi  , Suryani Nunuk 
Published: December 2019

Abstract
Learning material is a medium of learning source which stimulates students to learn something new. This study aimed at analyzing the effectiveness of mathematics learning materials based on Contextual Teaching and Learning. The research was a comparative study with pretest posttest only design. The research conducted at SMP Negeri 2 Gondang, Bojonegoro, East Java, Indonesia, The effectiveness of mathematic learning materials based on contextual teaching and learning was analyzed by comparing students’ achievement of mathematic. Data collected by mathematic test before and after implementing the learning materials. Data analyzed by using paired t test. The result of the study showed the score mean of pretest was 63.54, and score of posttest was 75.89. Paired t test of statistical test showed the significance level 0, 000 < 0.05. It means that Mathematic learning Material based contextual teaching learning was effective to increase students’ achievement.
Effect of Rare Earth Element Content on High Cycle Fatigue Property of Titanium Alloys
Authors: Zeng Liying , Hong Quan , Mao Xiaonan , Qi Yunlian , Zhao Yongqing 
Published: December 2019

Abstract
High cycle fatigue (HCF) properties for high temperature titanium alloys without and with different content of rare earth element Y have been tested at ambient temperature at a frequency of 100Hz or so and a load ratio R of 0.1, and the effect of Y on fatigue fracture behavior was also analyzed. The results indicated that the HCF strength for the alloys increases with the increment of rare earth element content, and the strength of the two alloys with Y are lower than that of the alloy without Y. Compared with the alloy without Y, the strength for the two alloys with Y decreases 11.2% and 17.4%, respectively. The particle size for rare earth oxide dispersely precipitated from the matrix alloy varies from several hundred nanometer to several micrometer. The crack initiations for the alloys are related to the fracture of rare earth oxide particles.
Study on electrochemical properties of Al-Ga-Mn-Ca-Cu alloy electrode alkaline system
Authors: Xie Gang , Yang Yagang , Yu Xiaohua , Zhang Lei , Shi Chunyang , Qu Yasong , Li Rongxing 
Published: December 2019

Abstract
This study is aimed to study a new type of Al-Ga-Mn-Ca-Cu anode alloy. The corrosion behavior and electrochemical performance of the alloy in different concentrations of NaOH solution were studied. The micro-corrosion morphology of the alloy anode was observed. The conclusion is as follows: With the increase of the concentration of NaOH solution, the alloy anode film resistance Rf and the pore resistance Rpor are reduced, so that the reaction rate of the anode of the reaction alloy is increased, the activity is improved, and the reaction of the alloy anode is facilitated; The main corrosion factor of alloy anode is hydrogen evolution corrosion. Therefore, inhibition of hydrogen evolution corrosion on the basis of maintaining anode activity is the next research focus of the alloy anode. When the alloy anode is continuously constant current discharge at different current densities, the voltage of 5mol/L NaOH solution the minimum drop is the most stable; the comprehensive performance is 4mol/L NaOH solution, and the discharge performance is the best, the Al-0.017Ga-0.885Mn-0.038Ca-0.048Cu (wt.%) alloy has a lower corrosion rate in the 4mol/L NaOH solution. The higher discharge voltage and the highest anode energy density are more suitable for continuous constant current discharge at different current densities; the constant current discharge and EIS results of the alloy agree well with the corrosion characteristics.
Features of the separation of difficultly separable organic compounds by liquid-phase adsorption on HKUST-1-type framework structures
Authors: Bratchikova I G , Kovtun S O , Markova E B , Isaeva N Yu , Cherednichenko A G 
Published: December 2019

Abstract
The work is devoted to the study of the adsorption characteristics of MOF based on Cu2+ for the processes of liquid-phase adsorption of aromatic organic compounds. The metal organic framework HKUST-1 based on Cu2+ ions with 1,3,5-benzenethricarboxylic acid as ligands was studied and its adsorption parameters were established, in particular, retention times for various substances from a number of chlorophenols, efficiency and resolution of chromatographic HKUST-1 based columns for selected compounds.
The effect of transition metal oxides on the sintering and properties of ceramics in the ZrO2-Al2O3 system
Authors: Obolkina T O , Goldberg M A , Smirnov V V , Smirnov S V , Antonova O S , Titov D D , Barinov S M 
Published: December 2019

Abstract
The paper presents the results of the investigation of the transition metals oxides – cobalt and iron additives influence on the sintering and properties of the ceramic material based on ZrO2- Al2O3 system with 10 wt.% Al2O3. It is shown that the addition of the oxides resulted in the significant increase of the sintered ceramic materials ZrO2-10%Al2O3 strength and decrease of sintering temperature. The maximum bending strength was more than 800 MPa (sintered at 1450 °C) and porosity was less than 1%.
Electron irradiation resistance of the composite material structure based on ultra-high molecular polyethylene and boron carbide
Authors: Tsepelev A B , Kiseleva T Yu , Zholudev S I , Kovaleva S A , Grigoryeva T F , Ivanenko I P , Devyatkina E T , Ilyushin A S , Lyakhov N Z 
Published: December 2019

Abstract
Effect of electron irradiation on the structural state of a composite material based on ultrahigh molecular weight polyethylene (UHMWPE) and boron carbide particles (B4C) which is a precursor for functional radiation protection materials has been investigated. Composite powder materials were synthesized from industrially available components by the method of mechanochemical activation under conditions of intense shock-shear deformations. Specimens in the form of 2 mm thick composite powder’s pressed plates were irradiated with 2 MeV electrons in air. Studies of changes in the structural and morphological characteristics of the composite samples were carried out by means of scanning electron microscopy, X-ray diffraction, FTIR spectroscopy and differential scanning calorimetry. Effects of electron irradiation on the structure of the composite as a whole and its components were analysed. The analysis of the obtained data showed the resistance of the composite material with respect to the electron irradiation fluence up to 8·1014 cm–2.
Synthesis and characterization of a cross-linking monomer based on 1,3-diallyl-1,3-di[bicyclo[4.2.0]octa-1,3,5-trien-3-yl]-1,3-dimethyl-siloxane
Authors: Levchenko K S , Adamov E G , Demin D U , Chudov K A , Bulanova A V , Lyssenko K A , Kalashnikov A Yu , Shmelin P S , Grebennikov E P 
Published: December 2019

Abstract
New cross-linking monomer based on 1,3-diallyl-1,3-di[bicyclo[4.2.0]octa-1,3,5-trien-3-yl]-1,3-dimethyl-siloxane (BCB-All) was synthesized and its physical properties were studied. BCB-All was incorporated into copolymer with TGM-3 and PFHDA by two stage thermal polymerization. The cross-linking of the copolymers occurs by thermo-initiated ring-opening reaction of BCB at 120-200°C. Resulting BCB-All homopolymer, BCB-All-TGM-3 (50:50), and BCB-All-PFHDA (50:50) copolymers have high thermal stability (Td5%,=464°C, 322°C, 435°C respectively) and good dielectric properties (ε=2.34-2.48 at 10HHz).
The failure mechanism of NiPtSi multilayer films
Authors: Zhang Junmin , Wen Ming , Chen Jialin , Guo Junmei , Guan Weiming 
Published: December 2019

Abstract
In this work, NiPtSi multilayer films were deposited on Si wafer by magnetron sputtering method. The forward voltage (VF) and reverse leakage current (IR) of NiPtSi multilayer films were tested. It was found that VF and IR in some area of the wafer were abnormal as compared with others. Both kinds of multilayer films were examined by transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDAX). And the reason for abnormal electrical properties were discussed based on the microstructure observation.
Preparation of Al2O3/W-Cr composite and its tribology properties
Authors: Lyu Z L , Jia L , Ma L 
Published: December 2019

Abstract
Microstructure and its formation process as well as tribology properties of Al2O3/W-Cr composite prepared by sol-gel and powder metallurgy method were studied in this paper. Results show that the Al2O3 particles can be distributed uniformly in the mixed powders of W-Cr by sol-gel method, and metallurgical bonding between W and Al2O3 particles can also be realized by the bonding action of Cr particles. The wear rate of Al2O3/W-Cr composite increases with the increase of testing load, but the friction coefficient increases firstly and then decreases. When the testing load is 15 N, the friction coefficient reaches the peak value. Wear mechanism of Al2O3/W-Cr composite is dominated by abrasive wear at lower testing loads, but transfer to adhesive wear accompanied with oxidation at high testing loads.
Characteristics of dry sliding electric contact of sintered metal based composites at catastrophic wear onset
Authors: Fadin V V , Aleutdinova M I , Aleutdinov K A 
Published: December 2019

Abstract
Dry sliding of powder metal based composites was carried out against steel counterbody under electric current of density higher 100 A/cm2. It was shown that the surface layers were transformed into tribolayers under these sliding conditions. An optical image of the possible deterioration of the tribolayer and a method for estimation its specific electrical resistance were presented. It was established by X-ray phase analysis that the tribolayers contained the initial phases and, sometimes, FeO. The relatively low electrical resistance of the tribolayer and the formation of FeO on the sliding surface corresponded to low wear of the composite without alloying metals in the primary structure. The tribolayers of composites with dissolved metals in the primary structure had high specific resistance, were not able to form FeO on their sliding surfaces and had strong deteriorations. This manifested itself as high wear. At the same time a manifestation of low electrical conductivity of the contact was observed. The catastrophic wear of both types of composites began at nearly equal power on the contact spots but at different current densities. It was concluded that the high wear was due to the absence of FeO on the sliding surface and weak relaxation of stresses in the friction zone of composites containing dissolved metals in their base.
Organoelementoxanealumoxanes — precursors of ceramic fibers of oxide composition
Authors: Shcherbakova G I , Storozhenko P A , Apukhtina T L , Kutinova N B , Varfolomeev M S , Zabelina A A , Krivtsova N S , Zhigalov D V , Drachev A I , Ashmarin A A 
Published: December 2019

Abstract
Researches of ICTOEC have developed efficient methods for the synthesis of ceramic-forming organoelementoxanealumoxane oligomers with fibre-forming properties which are promising precursors of refractory oxide fibers: α-Al2O3 modified by Y and Mg oxides, spinel MgAl2O4, garnet Y3Al5O12) as well as blend composition fibers MgAl2O4+Y3Al5O12 to produce conceptually new high-temperature ceramic composites for structural purposes.
Investigation of the processes of modification of polyimide systems required to create reinforced composite materials by 3d printing
Authors: Egorov A S , Bogdanovskaya M V , Gudeeva D S , Chalaya N M , Kramarev D V , Osipchik V S , Ivashkina V N , Storozhuk I P 
Published: December 2019

Abstract
To obtain polyimide films the processes of modification of polyamic acid were investigated. The rheological and deformation-strength properties of the modified polyimide materials were determined. The modified polyimide systems with adjustable properties were developed.
Regulation of carbon plastic properties upon impact by hybridization of the reinforcing fibers
Authors: Korneeva N V , Kudinov V V , Krylov I K 
Published: December 2019

Abstract
Regulation of carbon fiber reinforced plastic (CFRP) properties and failure mode upon low-velocity impact by hybridization of the reinforcing fibers is discussed. Effect of the ratio of carbon fiber (CF) and plasma-activated ultra-high molecular weight polyethylene (UHMWPE) fiber contained in a hybrid fiber on the ultimate tensile strength and impact properties et al. properties of the hybrid composite material (HCM) has been investigated by impact break (IB) method. It was found out that at the ratio of CF:UHMWPE-fiber = 20:80, the carbon and UHMWPE-fibers in HCM are no longer deformed and broken down simultaneously. At first carbon and then UHMWPE-fiber are broken down. At this ratio the HCM values of ultimate tensile strength and specific absorbed-in-fracture energy were increased by the factors of 1.65 (from 594 to 986 MPa) and 1.98 (from 47 to 89 J/cm2), respectively. The detected effect of the delay in the destruction of HCM can be used to create aircraft and other impact-resistant structures.
Rheological properties of MgAl2O4 obtained from preceramic organomagnesiumoxanealumoxanes
Authors: Gumennikova E A , Titov D D , Lysenkov A S , Frolova M G , Kargin Yu F , Shcherbakova G I , Novokovskaya E A 
Published: December 2019

Abstract
In this study, a detailed study of ceramic spinel powder obtained by the new method was carried out. Namely, the study of the influence of the pyrolysis temperature of the oligomer and grinding time on the microstructure, phase composition and rheological properties of spinel during pressing. Graphs of the dependences “stress-strain” and “stress – relative density” were obtained, which characterize the rheological properties of aluminium-magnesium spinel obtained in a new way. Analyzing the obtained dependences, we can conclude that with an increase in the pyrolysis temperature, spinel is more natural to deform, which is associated with a change in structure. According to the data obtained, a dependence on the growth of the elastic modulus after grinding is also observed.
Investigation of superplasticity of ultrafine-grained copper alloys obtained using the ECAP
Authors: Chuvil’deev V N , Gryaznov M Yu , Shotin S V , Nokhrin A V , Kopylov V I , Chegurov M K , Bobrov A A , Shadrina I S , Vostokov M M 
Published: December 2019

Abstract
The paper describes the results of experimental studies of the superplasticity of ultrafine-grained (UFG) high-purity copper, as well as UFG copper alloys Cu-Ag and Cu-Cr. The study shows that the introduction of small (up to 0.1 wt.%) additives of alloying elements leads to an increase in the ductility of UFG copper at elevated temperatures. An increase in the concentration of alloying elements complicates the process of plastic flow of UFG copper at elevated temperatures due to the difficulty in grain-boundary sliding.
Features of the modification of polylactide by (meth)acrylate groups in organic solvents
Authors: Kopylov A S , Shashkova V T , Matveeva I A , Kaplin V S , Glagolev N N , Minaev N V , Timashev P S , Solovieva A B 
Published: December 2019

Abstract
Polymerizable (meth)acrylate groups were introduced into polylactide (PLA) in the methylene chloride or toluene medium. Polymer modification was carried out both on the carboxyl and hydroxyl groups of polylactide. The efficiency of this modification was studied depending on the type of reaction. It was found that the highest degree of polylactide modification by (meth)acrylate groups (86%) is achieved through the formation of PLA urethane derivatives in the presence of diisocyanates. Samples of photocured, three-dimensionally crosslinked after such a modification polylactides were obtained, their biocompatibility was determined. It was shown that such materials are promising for use in regenerative medicine and tissue engineering.
Hybrid composites based on alumina and magnetite nanoparticles for biomedical application
Authors: Shapovalova Olga E , Fakhardo Anna , Drozdov Andrey S 
Published: December 2019

Abstract
Porous nanostrucutred finds a great number of applications in science and industry. One of the most promising area of application of such materials lies in the field of drug delivery and creation of targetable nanoformulations. Here we describe a convenient and scalable method of production of magnetic porous matrices for drug delivery. The materials were created of stable boehmite and magnetite hydrosols via room-temperature sol-gel transition. As the result mesoporous hybrid matrices were produced with their textural and magnetic properties dependent on the ratio of components in their composition. The materials showed excellent biocompatibility on HeLa cell line in concentrations up to 200 µg/mL and good loading capacity with a model drug doxorubicin.
Research on the Technological Development of Lithium Ion Battery Industry in China
Authors: Shen Chen , Wang Huaiguo 
Published: December 2019

Abstract
Combined with the background of the rapid development of new energy automobile industry and the power battery gradually becoming the absolute main force of the market in recent years, this paper illustrates the current development status of global and Chinese lithium ion battery industry and analyzes the future development trend of the industry. Focusing on ternary lithium ion battery, all-solid-state lithium ion battery, anode material, lithium hexafluorophosphate electrolyte and diaphragm materials, this paper describes the research and development of different key materials and technologies of lithium ion battery, and gives the prospect of future technology development direction. Based on Chinese lithium ion battery industry background, reasonable industrialization suggestions are put forward.
Recent progress in syntheses and applications of Cu@Ag core-shell nanoparticles
Authors: Ma Fei , Zhang Jingguo 
Published: December 2019

Abstract
Cu@Ag core-shell nanoparticles have attracted much attention over the past decade due to their unique electronic properties, and their potential use in a wide panel of applications ranging from catalyst to printed electronics. In this paper, we reviewed the preparation methods of Cu@Ag core-shell nanoparticles and their applications. Based on these literature reviews, the prospect have been presented in the end of this review.