bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Lego Mindstorms as an Innovative Educational Tool to Develop Students’ Creativity Skills for a Creative Society
Authors: Masril Mardhiah , Hendrik Billy , Theozard Fikri Harry , Hazidar Al Hamidy , Priambodo Bagus , Naf’an Emil , Handriani Inge , Pratama Putra Zico , Kudr Nseaf Asama
Published: December 2019

Creativity is a very important skill that should be possessed by the human resources of a country, especially in this period of the 21st century. Human creativity must be stimulated from various things, including via the field of education to improve the quality of human resources. The goal of this study was to investigate the impact of Lego Mindstorms as learning tools to improve the creativity skills of students, using an experimental methodology. We used a random sampling technique to select 40 students as the sample (N=40) for the study, with age ranging 10-12 years old; the sample was divided 2 groups, 20 students were assigned to the control groups, while the other 20 students formed the experimental groups. The student’s creativity skills were taken from a figural creativity test (TKF). This test was conducted before the intervention (pretest) and after the intervention program (posttest). In the intervention program, the experimental group students were given some education about robotic technology via the use of the Lego Mindstorms tools. To analyze the test results, we utilized the Statistical Product and Service Solutions package. The finding showed that there are significant differences between the creativity scores of students in the experimental group and the creativity scores of the control group. The Lego Mindstorms influences the enhancement of student’s creativity of around 23.6% in the experimental groups.
Analysis of Critical Thinking from Student with Quantive Approach
Authors: Rahmawati Laila , Subanji  , Septi Nur Afifah Dian
Published: December 2019

This study aims to describe critical thinking of male and female students in solving story problems. This type of research is qualitative descriptive research. The subjects in this study were class VIII Tunggangri MTsN consisting of one male student and one female student. Subject selection with purposive sampling technique. The instruments used are test sheets and interview guidelines. Collection techniques with tests and interviews. The data analysis technique is done by categorizing the data at the level of critical thinking and analyzing each level of critical thinking based on gender. Based on the results of the research and discussion it can be concluded that students’ critical thinking skills in solving story problems include male and female students having different levels of critical thinking. Critical thinking ability of male students can fulfill 1 critical thinking indicator from 4 critical thinking indicators. Whereas female students can fulfill 2 indicators of critical thinking from 4 indicators of critical thinking. With this research, it is expected to help teachers in developing students’ critical thinking skills both male and female students.
Strategy teaching of Education from batik technique and Hayan sabitah perspective
Authors: Kairina A , Lestari N S
Published: December 2019

This research discusses the strategy of thinking about human relations with God, which is compiled through the parable of someone who produces a piece of batik cloth. The focus of this research is to explore a strategy, which contains two techniques or methods, namely, techniques that achieve life perfection that run parallel to batik techniques. The purpose of this study is to explain the achievement of human relations with God, through the workings of someone who produces a piece of batik cloth. This study uses a qualitative research paradigm procedure. The results of the study indicate that, there is one strategy that is used to instill certain concepts through batik techniques that have been widely known to the public. This strategy covers two techniques, which are carried out in one step. One technique with another technique complements each other. If both of these techniques are carried out separately it will indeed be very difficult to achieve the best results. With the strategy of teaching the concept of divinity through batik techniques, it is expected that the main teachings about the philosophy of divinity, called Hayan sabitah, can be easily conveyed. The technique of doing this comparison is intended so that the concept of Hayan sabitah which is a key to the perfection of human life can be achieved perfectly. Therefore looking for a simple way but related to everyday life, namely with batik techniques. That is why, in Javanese mysticism, it is often said that Hayan sabitah is a physical and spiritual struggle that must be lived by someone in his life.
The Effort of Implementing of The Big Book as A Media to Improve The Intelligence of Linguistic Verbals for Early Childhood
Authors: Setyorini R , Saddhono K , Ermanto  , Wildan M , Kirom S
Published: December 2019

Children’s vocabulary or verbal linguistics can be improved through several media including the big book. Big book is a learning media that is very easy to understand by early childhood. Big book has the characteristics of short stories, clear sentence patterns, images that have meaning, type and font size clearly read, and the storyline is easy to understand. This certainly makes it easy for early childhood to improve their linguistic verbal. This research is library research. The method used in this study is a philosophical and pedagogical approach that is to analyze more deeply about the application of big book media as an effort to improve verbal linguistics in early childhood. The purpose of this study is to formulate how big book media can improve intelligence of linguistic verbal in early childhood.
Disaster risk management strategy in the environment and disaster mitigation-based school (SWALIBA)
Authors: Wardana Sindhung , Herdiansyah Herdis , Wicaksono Adam
Published: December 2019

According to National Agency for Disaster Management data, more than 46, 000 schools in Indonesia had been affected by the disaster in the past 15 years and around 250, 000 schools in Indonesia are located in the disaster management area. Even though, school is a vital infrastructure for the development of a country’s civilization. In the school, the process of character forming for the next generation of the nation both socially and intellectually takes place. After the 9.1 SR earthquakes and tsunami in Aceh on December 26, 2004 the disaster risk management movements which were begun from school were more intensively conducted. Among the disaster risk management movements at the school level, there is a concept and formulation of the environment and disaster mitigation-based school (SWALIBA) by the Indonesian Geographer Association (IGI) and the Indonesian Geography Student Association (IMAHAGI). Many of the schools at the primary and secondary education level began to adopt that concept. One of the schools which adopted the SWALIBA concept is junior high school 41 of Semarang City and has been applying it for 5 years. This research was conducted to study the applied risk management strategies. The result showed the gap between the applied strategy and the perception which formed the preparedness characteristic of the students as the implementation object.
The framework accommodation of systems recommendation via social media
Authors: Ariyanto Doni , Edi Nugroho Lukito , Erna Permatasari Adhistya
Published: December 2019

Tourists can plan trips using social media and other information sources found on the internet. However, to get information takes more time and efficient less. Recommendation systems have been developed to solve this problem. This research proposes the two-way relationship framework for the accommodation of systems recommendation using the hybrid method. To implementing the two-way relationship framework, this research is divided into two main architectural frameworks, the text processing architecture and the component system recommendation architecture. Focus this research for the framework component recommendations, where the decision-making process within the framework of two-way relationships using the hybrid method. The two-way relationship framework is probably to provide impression for the accommodation of system recommendation that can be developed and implemented in future research.
The Impact of Age, Gender, and Educational level on the Cybersecurity Behaviors of Tertiary Institution Students: An Empirical investigation on Malaysian Universities
Authors: Fatokun F B , Hamid S , Norman A , Fatokun J O
Published: December 2019

A lot of cybersecurity breaches occur due to human errors. Tertiary institutions need to enhance students’ cybersecurity awareness and capabilities, hence promoting safe cybersecurity behaviors. Socio-psychological factors affects students’ cybersecurity behaviors. We explore to what extent age, gender and educational level, plays a role in mediating the factors affecting tertiary institution students’ cybersecurity behaviors. A cross-sectional survey was conducted among 340 students and Structural Equation Modelling was employed for evaluating impacts. Data analysis was conducted via SPSS (V.25). Results show that students cybersecurity behaviors varies based on Age for factors such as: Perceived Severity, Peer Behavior, Familiarity with Cyber Threats, Response Efficacy and Perceived Vulnerability. Gender effects existed in Security Self Efficacy, Computer Skills, Cybersecurity Behaviors, Perceived Severity, and little effects in Prior Experiences with Computer Security Practices. Educational level differences existed in Cues to Action and Familiarity with Cyber-Threats. Age, gender and educational level are important factors in mediating students’ cybersecurity behaviors. Practically, our findings can instigate the need for specific/focused cybersecurity training and interventions for students in the tertiary institutions. It can also help cybersecurity training units in the tertiary institutions to target very vital components of cybersecurity behavior model, hence improving the cybersecurity behaviors of the students.
Knowledge Management of Performance Analysis and Quality Service from Regional Public Health Pariaman
Authors: Brama Kumbara Vicky , Yeni Fitri , Andika Putra Rio , Mittra Candana Dori , Dharma Robby
Published: December 2019

Competition increasingly competitive requires every company both manufacturing and services, including RSUD Pariaman to always consider the customer wants and needs and try to meet what they expect. The purpose of this research is to analyze how is the quality of service, a service attribute be the first priority, and recommendations can be given to improve the quality of services RSUD Pariaman. The results showed that 25 of the 26 attributes of service is worth the negative gap with the largest value of -1.21 for the attribute “The hospital has a waiting room, treatment rooms, beds, toilets and adequate sanitation” and “The hospital has enough medicines and adequate medical equipment (such as CT-Scan, MRI, USG, etc.)”. Based on analysis of IPA there are 11 attributes included in quadrant A and must be repaired. Recommendations based on the highest priority needs to be done and improved in advance is “Conducting training and employee empowerment” with the highest analytical value 0.170 or 17.02%. With this recommendation is expected to improve the quality of service in RSUD Pariaman.
The Development of Students’ Aptitude Test in Online and Multimedia Based Interests Group Selection
Authors: Wulandari F , Mardapi D , Haryanto
Published: December 2019

Each individual has different aptitudes and personalities. Schools have a very important rules to map students’ interests according to students’ talents and interests. This is very important because proper placement of interest can support students’ academic ability. This study aims to create a standard measurement that can be used for mapping and tracking students’ talent in high school becomes easier and measurable. There are 5 aspects related to aptitudes in this research such as visual reasoning test, numerical reasoning test, verbal analysis test, spatial recognition test and vocabulary test. The Rasch model was used to analyze the difficulty level of the item, and from the results of the study showed that the difficulty level of the item was in the normal distribution at the interval -3.57 to 4.5. By using the Google Form tool, students’ aptitudes tests are developed and presented in varied form and can provide test result information automatically. The use of Google Form has several advantages, such as (1) the test does not have to be done simultaneously at the same time and place, (2) the item can be made more interesting because it can use images and audio visual facilities and (3) there is no need to duplicate the test paper since it is computer-based tests to minimize test administration.
Students’ Perceptions of Blended Learning in Mastering English for Specific Purposes
Authors: Mulyadi D , Hersulastuti  , Purnama Y
Published: December 2019

The blended learning has proliferated in recent years to integrate ICT into ESP instruction. Thus, ESP teachers have to acclimatize the feasibility of the advancement in facilitating English instruction for ESP learners. To this end, the present study assayed the ESP students’ perceptions toward the blended learning in mastering English for specific purposes. In the present study, the qualitative approaches were employed based on the questionnaire data. The data gathered from the questionnaire was gauged by descriptive analyses that utilized SPSS 21. The results show that most students get satisfied and enthusiastic to have blended learning of ESP course. However, the classroom interaction by using English and time management skills should be taken into deep concern by English teachers for developing the ESP blended learning course.
Entry application software to identify the development of reading and writing vocabulary
Authors: Inayatillah F , Kisyani  , Mintowati  , Mukhzamilah
Published: December 2019

The results of the reading literacy test for Indonesian children at national and international levels were low. Literacy tests are carried out by measuring aspects of understanding, using, and reflecting the results of reading in writing that contains vocabulary. Vocabulary is one of the important things that supports the development of student literacy. Thus, the vocabulary is important to study. This study identified the development of reading and writing vocabulary of junior and senior high school students. This research is descriptive quantitative. The data of this study were in the form of vocabulary derived from books of high school Indonesian students grade VII to grade XII based on the 2013 curriculum and the results of the writing of junior and high school students from grade VII to grade XII. Data were collected by entry application software. For data analysis, the linkage technique of comparing and contrasting was used. The results showed that the development of the number of Indonesian language entries in junior and high school student books was not good, tending to be stagnant. Compared with the results of similar studies in other countries, Indonesian language student books with the number of entries slightly less support literacy development include critical, creative, communicative, and collaborative thinking skills of junior and high school students. Conversely, the development of written vocabulary of middle school students has increased significantly.
Adiwiyata insight: information technology based environmental education at senior high school in Boyolali, Central Java
Authors: Saddhono K , Rohmadi M , Rondiyah A A , Purwiyanti Y , Suhita R , Sudaryanto M , Anindyarini A , Romadlon M R , Sudigdo A , Purwanto W E
Published: December 2019

This study aims to analyze the vision and mission of senior high schools in Boyolali. The analysis deployed Van Djik’s model of critical discourse analysis. The analysis deals with the analysis of text structure, social cognition, and social context. There were three senior high schools in Boyolali District, but only two schools applied Adiwiyata policy, namely SMA 1 Boyolali and SMA 3 Boyolali. Although SMA 2 Boyolali does not apply Adiwiyata policy, its mission also embodies a clean, comfortable, safe and healthy environment. The implementation of Adiwiyata policy in SMA 1 Boyolali, organizing some programs that involve activities of all the school community, including building absorption wells, biopori, waste management systems, greenhouse, planting trees, wall magazine about the environment and waste separation. Besides, the implementation of Adiwiyata Policy with the environmental concept is included in SMA 3 Boyolali curriculum, particularly local content subjects, such as Environmental Education (PLH) given to 10th grade. However, this subject is integrated into all subjects at 11th and 12th grades.
Development and Validation of Acceptability of Mental-Health Mobile App Survey (AMMS) for Android-based Online Counseling Service Assessment
Authors: Sukmawati I , Ardi Z , Ifdil I , Zikra Z
Published: December 2019

The development of internet brings significant changes in human life, including its influence on mental health conditions. As one of the countries with the largest increase in internet users in the world, Indonesia has important potential in utilizing this technology for psychological services. However, various studies show that the use of internet intervention in mental health services, especially by utilizing mobile-based technology, is still limited. This also relates to the conditions for receiving this intervention which are still not clearly known. This study aims to develop a measuring tool to explore the conditions of acceptance of internet interventions with mobile-app-based counseling services. This study involved 174 respondents spread across Indonesia with diverse demographics. Research results show that in general, measuring instruments meet good assessment requirements.
Statistical software adoption behaviour among Indonesia’s undergraduate students
Authors: Zaitul  , Rizki Mulyani Sitti , Ridwan Muhammad , Ilona Desi
Published: December 2019

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

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

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

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

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

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

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

Electrochemical 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

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

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

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

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

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

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

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

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

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

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

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

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

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

(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

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.
Development of LF-software for modeling of rifining processes in a ladle -furnace
Authors: Komolova O.A. , Grigorovich K.V.
Published: December 2019

The modern production technology’s of steel is based on the production of metal with narrow intervals of chemical composition, alloying elements and decreasing contents of non metallic inclusions. Mathematical models help to carrying out the process along the optimal way with minimal energy and material costs, reducing emissions. That allows to optimize production technologies, to provide a reduction the cost of steel, high production stability. An original mathematical model for the dynamic simulating of steel treatment technology has been developed. Physical and chemical models based on the law of conservation of mass and energy, as well as the principles of non equilibrium thermodynamics were used. All the stages of the process (zones) were taken into consideration in this software. This software takes into account input data such as: ladle equipment facilities, initial temperatures of slag and metal mass and chemical compositions, input time and mass of additives, blowing, electrical and time regimes, thermodynamic database, thermal, physical and chemical databases for additives and inert gas, production database (for statistics). For validation of the software, the results of ladle treatment of real heats of steel and sampling control results were used.
Development of digital twins and optimization of resource-efficient steelmaking technologies
Authors: Grigorovich K V , Komolova O A
Published: December 2019

In this study, mathematical models, algorithms and software for dynamic simulating of processing technologies in a ladle furnace and vacuum degassers were developed, and a new method for optimizing ladle processing technologies for various steel grades was created. Physicochemical models were developed based on the laws of conservation of mass and energy, as well as the principles of non-equilibrium thermodynamics. The developed software allows us to calculate the basic characteristics of steel refining processes, such as temperature and chemical composition of slag and steel melts, kinetics of refining processes, economic indicators, energy and resource efficiency of technologies. To validate the software, the results of industrial hits and the results of the control of metal and slag were used. Nonmetallic inclusion analysis procedures have been developed using the fractional gas analysis method to control of steel cleanness and to detect and adjust the sources of inclusions formation at all stages of ladle furnace steel processing. For various steel grades, it was shown that it is possible to successfully optimize technologies using a combination of developed modeling software and fractional gas analysis. A mathematical model for the interaction of a high chromium iron base melt with a low temperature plasma was developed. Comparison of the experimental results in DC arc furnace with calculating data is in a good agreement.
Study of the influence of thermal treatment on the structure and mechanical properties of carbon rail steel
Authors: Nagicheva G S , Nokhrin A V , Piskunov A V , Melekhin N V
Published: December 2019

The article provides the results of investigation of the way various types of thermal treatment affect the microstructure parameters and mechanical properties of grade 76HF (R65) carbon rail steels produced by Russian and Japanese manufacturers and used for the production of R65 rails. We determined the optimal heat treatment conditions to provide an increased microhardness and wear resistance of rail steel.
The Microstructure and Mechanical Properties of 308L Alloy Fabricated by Micro-plasma Arc Additive Manufacturing
Authors: Ren Xianghui , Yu Chen , Zhang Wenjie
Published: December 2019

In this article, micro-plasma arc additive manufacturing of 308L alloy was conducted and the microstructures and mechanical properties of the fabricated specimens were investigated. Micro-plasma arc was adopted as heat source and forming paths were varied during wire and arc additive manufacturing (WAAM) by using ER308l wire. The results showed that the Z-type forming path specimen’s quality was better than the unidirectional forming path’s. Analysis of the microstructures and mechanical properties of the specimens showed that the Z-type forming path specimen had a higher tensile strength, hardness value and percentage of elongation than unidirectional forming path specimen. The Z-type forming path and the unidirectional forming path specimens’ microstructures were both composed of austenite and ferrite, but the Z-type forming path specimen’s microstructure had larger grain size and it showed a distinct crossed microstructure.
Testing of materials perspective for nuclear fusion reactors with inertial plasma confinement by Plasma Focus and laser devices
Authors: Gribkov V A , Demina E V , Kazilin E E , Latyshev S V , Maslyaev S A , Pimenov V N , Paduch M , Zielinska E , Laas T
Published: December 2019

A survey of consequences on recent testing of materials perspective for the fist-wall components of nuclear fusion chambers with inertial plasma confinement is presented. The main instruments in these irradiation experiments were Dense Plasm Foci facilities of different energy levels and Nd-glass lasers. Results of investigations of physical processes of interaction of powerful plasma jets, streams of fast ions and laser beams with the targets under tests are discussed. Subsequent analytical researches of various characteristics of damageability of dissimilar samples – both surface and bulk of them – are debated.
Modification of non-woven materials based on sodium alginate for tissue-engineering
Authors: Tenchurin T Kh , Pavlovsky M M , Shepelev A D , Mamagulashvilli V G , Gomzyak V I , Sedush N G , Krasheninnikov S V , Puchkov A A , Malakhov S N , Sharikov R V , Chvalun S N
Published: December 2019

This article describes the fabrication of non-woven fibrous materials based on sodium alginate by electrospinning and their modification with RGD peptides. The rheological properties of sodium alginate solutions are investigated. A defect-free fibrous material with an average fiber diameter of 180 nm was obtained. Ionic and covalent crosslinking of sodium alginate was carried out.
Effect of carbonaceous matter on copper behavior in bioleaching from waste printed circuit boards
Authors: Zhao Qianfei , Yang Hongying , Tong Linlin
Published: December 2019

In this paper, the effects of humic acid, activated carbon and graphite on the bioleaching behavior of copper from waste printed circuit boards (WPCBs) with HQ0211 bacteria strain have been investigated. The compatibility test and the optimal additive amount of carbonaceous matter and the mechanism analysis were studied. It was demonstrated that humic acid has good compatibility with microorganisms. Humic acid can significantly promote the dissolution rate of copper with appropriate amount. The addition of activated carbon and graphite could inhibit the growth of bacteria. And the inhibition was weakened on the bioleaching process. The optimal condition of bioleaching copper was WPCBs 50 g L−1, initial pH 1.5, bacterial leaching time 7 days, the leaching rate of copper increased by 11.08%, 8.71% and 6.84% respectively in the experimental group with proper dosage of humic acid, activated carbon and graphite.