bluuebunny/crossref_metadata_2025 huggingface dataset:
Bandit algorithms in information retrieval evaluation and ranking
Authors: Muwanei Sinyinda , Wai Lam Hoo , Devi Ravana Sri , Kunda Douglas
Published: December 2019

Bandit algorithms have been widely used in many application areas including information retrieval evaluation and ranking. This is largely due to their exceptional performance. The aim of this study is to examine the overall published studies in terms of trends that shape the use of bandit algorithms in the evaluation and ranking of information retrieval systems. This study also seeks to classify the bandit algorithms used in the research domain. In totality the evaluation metrics, datasets, contribution facets of primary studies as well as the bandit categories are discussed.
A review study: The effect of face aging at Estimating Age and Face Recognition
Authors: Ragheb Atallah Rasha , Kamsin Amirrudin , Akmar Ismail Maizatul
Published: December 2019

The face may be a made supply of data for indicating the personal characteristics like identity, ethnicity, expression, age and gender. The face characteristics measure thought-about jointly of the necessary individual characteristics. This could be utilized in several software, like age estimation and face recognition. The value of those applications depends on different areas, like security applications and group action application. Additionally, face expression square measure notably important with finding the lost kid, this applications have accomplish high level of accuracy. The paper offers a survey of face aging recognition. Furthermore, the analysis faced many challenges in face recognition space that had been explored. The analysis all over that face algorithms performance is distinct from one to another. This research contributes to display the gaps for different methods on this line of research.
Expert system for disease diagnosis in cocoa plant using android-based forward chaining method
Authors: Ariandi Vicky , Kurnia Hezy , Heriyanto  , Marry Hilda
Published: December 2019

Cocoa is one of the plantation crops that has high economic value besides it can also provide a large contribution so that it can increase the source of foreign exchange in Indonesia. This expert system is made for Android device users. In 2010 Indonesia succeeded in occupying the number three position after Ghana and Ivory Coast as the largest cocoa producer in the world. But the amount of cocoa production in West Sumatra has decreased due to a lack of knowledge of farmers in caring for and cultivating it. This is the background of this research, where this expert system uses the Forward Chaining method as a symptom search method that has been included as a tracking algorithm for each rule that has been set. So that it can produce an expert system for diagnosing cocoa plants that are right for farmers. When conducting a consultation, the user can answer Yes or No from the question given by the system. User answers are then processed based on rules and calculated using the forward chaining method. Testing is done to see if the system can run well as expected.
Automatic System to Fish Feeder and Water Turbidity Detector Using Arduino Mega
Authors: Hendri H , Enggari S , Mardison  , Putra M R , Rani L N
Published: December 2019

This tool system works automatically, which functions to feed the fish and detect the water turbidity. The fish that being feed and the water that is detected are in Aquarium or in Pond. Input for this tool are RTC (real time clock), Turbidity sensor and on/off button. To start or turn off the tool is used on/off button, to feed the fish automatically is used RTC component and to detect water turbidity is used turbidity sensor. Output for this tool is an LCD (liquid crystal display) display, Buzzer, Servo Motor and LED (light emitting diode) component. To display information in writing format is used LCD display, to sounding information in sound format is used buzzer, to move waterways door and foodways door is used servo motor and to indicate the tool is activated and processing is used LED component. The main component of controlling all component and program in this tool is Arduino Mega 2560. To make a tool program that will install in Arduino Mega is used C programming language for Arduino. By using this tool, will make activity in feeding the fish and detect turbidity of water be more effective, more efficient and easier than manually.
Internet of Things in Monitoring and Notification of Industrial Security Systems
Authors: Riyuska Alkhairunas , Santony Julius , Sumijan
Published: December 2019

One of the factors that influence the course of industry is the security factor, which is represented by security devices and security guards on the internal security system. Information technology changes the security system to be more complicated. The purpose of this study is to monitor and protect security systems using information technology. The method used in this study is the Monte Carlo Algorithm. This research provides a solution to the problem of mathematical data and decisions. The results of this study are automated testing in real-time communication, both on mobile devices and websites. The accuracy of the first data test was 98% and the second data test was 98%. This research is very appropriate to be applied in the application of industrial security systems.
Multiple Thresholding Methods for Extracting & Measuring Human Brain and 3D Reconstruction
Authors: Sumijan  , Ayu Widya Purnama Pradani , Arlis Syafri
Published: December 2019

Thresholding changes the gray image to binary imagery and improves image quality. This study applies the multiple thresholding method to extract and calculate the area of bleeding in the human brain. 10 samples of human brain image using multiple threshold method (Otsu and hybrid thresholding). The results of the Otsu method that still have noise can be overcome by the hybrid thresholding method. The results of the original image research with images that have been processed using the multiple thresholding method yield the optimum threshold value, the method applied produces excellent image quality. Results of calculation of MSE, RMSE and PSNR. the average PSNR Otsu thresholding: an average of 60.93 dB, the average PSNR Hybrid thresholding: 59.06 dB, and the average PSNR Multiple thresholding: 56.96 dB, the average MSE Otsu thresholding: 38.27, the average MSE Hybrid thresholding 36.15, mean MSE multiple thresholding: 34.30, mean RMSE Otsu: 9.49, mean RMSE Hybrid thresholding: 8.88, average RMSE Multiple thresholding: 7.58. The results of the calculation of the area of cerebral haemorrhage and the level of accuracy indicate a better multiple thresholding method. The results of the calculation of the bleeding area were carried out by 3D reconstruction using linear interpolation method.
Design Chipless Textile Tag for RFID Application
Authors: Anuar Mirza , Yeng Seng Lee , Shakhirul M. S. , Wee F.H. , Seng Gan Hong , Jusoh Muzammil , Sabapathy Thennarasan , Osman M.N.
Published: December 2019

This paper presents a chipless textile tag for RFID application. The CST microwave studio was used to design the chipless textile RFID tags which consist of three, four, and five slotted ring resonators nested in the circular patch. The RFID tag also fabricated using shieldit super fabric as conductive patch plane and the polyester fabric as substrate. The designed tags can operate over 1 GHz to 3 GHz frequency ranges. Each of the slot ring resonators are generate different reflection coefficient spectrum. The larger the slot ring create a resonate frequency at lower frequency. The measured and simulated results of the different slot ring chipless textile RFID tags are discussed.
Predicting GDP of Indonesia Using K-Nearest Neighbour Regression
Authors: Priambodo Bagus , Rahayu Sarwati , Hazidar Al Hamidy , Naf’an Emil , masril Mardhiah , Handriani Inge , Pratama Putra Zico , Kudr Nseaf Asama , Setiawan Deni , Jumaryadi Yuwan
Published: December 2019

The impact of the global recession in 1998 that originated from the recession in the US will affect the projected economies in Asia, including Indonesia, both direct and indirect nature. In this study, we predicted Indonesia’s GDP in the event of the economic crisis that hit Indonesia starting in 1998. Instead of using the famous prediction algorithm as a neural network and linear regression. K-Nearest Neighbour is selected because it is easy and fast to use in the small dataset. We use a dataset from 1980-2002, consisting of rice prices, premium prices, GDP of Japanese country, American GDP, currency exchange rates, Indonesian government consumption, and the value of Indonesia’s oil exports. For evaluation, we compare k-NN regression prediction result with prediction result using back propagation neural network and multiple linear regression algorithm. Result show, k-NN regression is able to predict Indonesia’s GDP using small dataset better than the neural network, and multiple linear regression method.
The Application of Data Mining in Determining Patterns of Interest of High School Graduates
Authors: Hartama Dedy , Perdana Windarto Agus , Wanto Anjar
Published: December 2019

This study proposes an application of Data Mining in determining patterns of Interest of high school Graduates to attend AMIK Tunas Bangsa Pematangsiantar and the dominant factors which affect the interest of high school graduates. The data was picked up from the application forms completed by those enrolled in the AMIK . In this study, algorithm C 4.5 decision tree was applied in order to obtain the pattern of data classification, i.e. school, status, school location, and year of graduation.. The interest pattern of these graduates demonstrated that the best variable of the predictor used is the school status which gives as much as 81, 71% performance accuracy to registration.
A Compact MIMO Planar Inverted-F Antenna
Authors: Najwa  , Nasrun Osman Mohamed , Jusoh Muzammil , Sabapathy Thennarasan , Al-Bawri Samir , Azizan M. M. , Ali Tarmizi
Published: December 2019

In this work, a compact MIMO antenna is designed as a planar inverted F-antenna (PIFA) which can be used for smallest smartphones. The proposed antenna will cover the GSM frequency range of 900MHz and 1800MHz. Those dual bands are attained with high gain up to 4.7dB. Simulation and experimental results have been presented.
OLAP Approach in Searching Manufacturing Industries in West Sumatera
Authors: Mandala E P W , Putri D E , Putra D W T , Mulya D P
Published: December 2019

The manufacturing industry is a business that uses machines, tools and workers in the process of converting raw materials into finished goods that can be sold. The manufacturing industry has an important role in the Indonesian economy. The industry contributed a large income to the country. In West Sumatra, there are many manufacturing industries that are growing and developing both on a medium scale and large scale which are spread throughout the cities and districts. So that it makes it difficult for the Department of Industry of West Sumatra Province to collect data on the existence of manufacturing industries. To solve this problem, approach of Online Analitycal Processing (OLAP) is used to search data in a hierarchical manner. OLAP is designed using fact tables and several dimension tables. OLAP will provide the number of industries as a measure . This research can help the people of West Sumatra to find out about the local manufacturing industry and what products the industry produces. In the end, local industrial products will be favored by many local people and increase the income of the province of West Sumatra.
Expert System Insemination
Authors: Wiyandra Yogi , Yenila Firna , Wahyuni Suci , Febrihadi
Published: December 2019

Insemination is a method used as a program by injecting sperm directly into the cervix so fertilization can occur. According to world health, the success rate of this program ranges from 20-30%, allowing several couples to choose this alternative. The process of applying artificial insemination requires the right pregnancy results, which require proper identification. System identification technology can be done quickly to assist in the identification of fertility that must be performed by an obstetrician. System development in this research is an expert system to determine the success of insemination programs for pregnancy. This system makes it easier for couples to consult and provide information to couples about insemination activities based on their partner’s condition. This expert system is made with a Hybrid method, where reading data from this method is done by forward chaining and certainty factors. The forward chaining method aims to read the cycle of couples who will carry out insemination and certainty factors, namely the method used to determine the level of success in the pregnancy program that will be obtained by the couple.
Analysis of the Success of Student Monitoring Information System Implementation Using DeLone And McLean Model
Authors: Riasti B K , Nugroho A
Published: December 2019

The Primary School implements the Student Monitoring Information System, which is used for communication between the teacher and parents of students regarding student learning. This study analyzes the successful implementation of the Student Monitoring Information System and what factors need to be improved. The method used in the research is the DeLone and McLean Information System Success Model. The results of this study indicate the percentage of successful implementation of the Student Monitoring Information System, including assessment of system quality, information quality, service quality, usage, user satisfaction and net benefits. Overall, the implementation of the Student Monitoring Information System was declared successful, with 90% of respondents agree strongly, 6% of respondents agree, and 4% quite agree with the implementation of the Student Monitoring Information System.
Quantum Learning Methods to Improve students’ speech skill using Javanese’s Krama Alus
Authors: Yuniar K , Rakhmawati A , Setiawan B , Saddhono K
Published: December 2019

Low speech skill using Javanese’s Krama Alus in junior high school students led the writers to apply quantum method in learning process. Research and observation on the implementation of learning using Quantum method eventually resulted in a Classroom Action Research with 28 junior high school students as the research subjects. In addition, this research aims at improving students’ skills in giving a speech using Javanese’s Krama Alus. The study was conducted in two cycles; cycle 1 was learning with quantum method in homogeneous student groups (ability) and cycle 2 was learning with quantum methods in heterogeneous groups of students. There were four steps in the research procedure, i.e. action planning, action implementation, observation and reflection. The research data was obtained and collected using two techniques, test and non-test ones. Testing data validity was conducted in two ways; (1) data triangulation and (2) methods triangulation. Then, the data were analyzed by comparative descriptive and analytical critical techniques. The Indicators of action success were (1) Quality of the learning process and (2) Achievement of learning outcomes, in the form of skill in giving a speech using krama alus Javanese. The research data show that there are some developments in each observed cycle, from pre-cycle, cycle 1, and cycle 2. Moreover, the data show an increase in learning motivation (indicator of learning process success), and an increase in learning achievement (as an indicator of learning outcomes achievement). Based on the data and the discussion, it can be concluded that students become skilled at giving a speech using Javanese’ s Krama Alus with the application of quantum learning method.
Teaching Learning Javanese News Writing Trough Group Investigation Method And Illustration Media In Senior High School
Authors: Pratisthita S T , Winarni R , Sumarwati
Published: December 2019

The aim of this research was for improving the students’ skill of Javanese News Writing in Senior High School student through Group Investigation Method and Illustration media. This research was a classroom action research which conducted in two cycles. One cycle was done in four steps: planning, implementing, observing, and reflecting. The subject of this research was students class X IPS 2 SMA Negeri 1 Jogonalan. The data observations were taken from the teacher, students, and document review. The data collection was done through interview, observation, test, and document review. The data validations used were triangulation technique of data source and triangulation technique. Then, the techniques of analyzing data used were analysis technique and comparative descriptive. This research described that group investigation method and illustration media could improve the quality of process and result from pre-action up to cycle II. The percentage of process quality in pre-action was 22.2%, and then improved to 69, 4%, last in the cycle II the percentage improved to 83.3%. Whereas, the percentage of result quality in pre-action showed 41.6%, and then improved to 58, 3%, last, in the cycle II the percentage improved to 86, 1%. Based on the data explanation above, it can be concluded that group investigation method and illustration media can improve the students’ Javanese News Writing Skill on Senior High School Student.
Effect of cooperative learning model type of talking stick against student learning
Authors: Wijayanti Lidia , Sukwatus Sujai Imam , Septi Nur Afifah Dian
Published: December 2019

This experimental research aimed to know the influence and difference of learning talk stick. The research design used is posttest-Only Control Group design. The population in this study were 348 students. Sampling technique using cluster Random Sampling. This study uses two class samples. Methods of data collection using tests and documentation. Data analysis using simple regression test and Independent Sample TtestTest using SPSS 21.0. The result of simple regression test data analysis is thitung> t table, so H0 rejected and Ha accepted which means there is influence of using cooperative learning type of talking stick to result of study of IPS student of class VIII SMPN 1 Karangrejo indicated by acquisition of tcount 4, 448>ttable 2, 042. The result of test data analysis of independent sample ttest is thitung>ttable, so H0 is rejected and Ha accepted which means there is difference of using cooperative learning type talking stick model to result of study of IPS student of class VIII SMPN 1 Karangrejoshown from the acquisition of thitung2, 363>ttable1, 990.
Utilizing Digital Media for Embedding Local Cultural Values: Vocational High Schools Context
Authors: Hersulastuti  , Setiyadi D B P , Mulyadi Dodi , Asmara Rangga , Ratna Kusumaningrum Widya
Published: December 2019

Culture and language are truly inseparable. This study explored how teachers of Vocational High Schools (VHS) embedded local cultural values in their language learning by utilizing digital media. This was a small scale exploratory case study involving six participants comprising of three Indonesian language teachers, and three English teachers of Vocational High Schools in three different regencies of Central Java, Indonesia. The data were primary collected through interview and focus group discussion (FGD). To analyse the data, the interactive models of qualitative data analysis of Miles & Huberman (2014) was employed. Evidences showed that teachers used texts or video materials containing local culture in form of (1) ideas: norms, moral, religious values; (2) activities: traditional ceremonies, and (3) artefacts: historical places, foods, or customs. Teachers reported that among of methods recommended in 2013 Curriculum implementation, Inquiry and Project-Based Learning became teachers’ preferences. Students’ projects in form of texts writing or video making of certain local culture were resulted from the learning. Teachers supported their learning by the use of various digital medias, such as internet, animated video or You tube, WhatsApp group. Whereas google classroom and quipper school were other forms of digital learning presented while students were on the job training program. Teachers- students were connected by the presentation of the materials and assignments. Overall, embedding local culture in language learning raised students’ interest, increased their participation as well as developed their’ local cultural awareness.
Gamelan as a Learning Media Speaking Skills to Indonesian Language Students For Foreign Speakers (BIPA)
Authors: Riyanti A , Zuchdi D , Nurhadi
Published: December 2019

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

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

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

Statistical 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Combined electron-ion-plasma boriding of high-chrome austenitic steel
Authors: Ivanov Yu F , Petrikova E A , Teresov A D , Tolkachev O S , Romanov D A
Published: December 2019

A combined modification of the surface of high-chromium stainless steel 12Cr18Ni10Ti was carried out, including electro-explosive alloying with titanium and boron and subsequent irradiation with an intense pulsed electron beam. The formation of a multiphase submicro-nanocrystalline surface layer with a thickness of up to 70 μm was revealed. It was shown that the concentration of boron in the surface layer varies nonmonotonically, reaching a maximum value (≈19 at.%) at a distance of (10-15) μm from the alloying surface. It was established that the hardness and wear resistance of the modified steel layer exceeds the hardness of the initial state by 7 times, wear resistance - more than 9 times.
Self-propagating high-temperature synthesis of oxide bronzes with regulated composition and properties
Authors: Sologubova I A , Kotvanova M K , Pavlova S S
Published: December 2019

The work is devoted to the preparation of oxide tungsten bronzes of various compositions and various structures by the SHS method. The work is aimed at the realization of the ability to control the composition, structure and properties of SHS products. Brightness pyrometry technique was used for the experimental evaluation of the temperature in the combustion wave. The values of the electrical conductivity of the obtained samples of oxide tungsten bronzes with constant current: for K0.25WO3 — 0,029 S/cm; K0.50WO3 — 0,046 S/cm. Carbon paste electrode was produced and tested based on an oxide bronze K0.50WO3.
The modification of hypereutectic high-alloy silumins — prospects for the development of technology for producing materials with a low linear expansion coefficient
Authors: Bochvar S G , Predko P Yu , Konkevich V Yu , Kostin I V
Published: December 2019

This article discusses the possibilities of using hypereutectic silumins and the problems that impede their wider distribution. The known methods of manufacturing products from hypereutectic silumins of high quality are shown. A method for producing casting blocks from hypereutectic silumins by direct chill casting is considered. The possibility of milling primary silicon crystals by introducing modifiers and master alloys of Al-Si-P, Al-Cu-P systems, inorganic carbon and phosphorus compounds is shown. The tendency of copper-doped silumins to hot shortness is shown. The technology of impact on the melt of ultrasonic cavitation is considered together with the introduction of additional active modifiers made of master alloy rods to obtain casting blocks from hypereutectic high-alloy silumins using the method of direct chill casting with a primary silicon crystal size of no more than 10 µm. Technological principles for reducing the grain size of α-solid solution, uniformly distributed over the ingot cross-section, are proposed.
Electron irradiation of palladium-copper alloy
Authors: Simakov S V , Ashmarin A A , Vinogradova N A , Nikitushkina O N
Published: December 2019

The process of high-energy electron irradiation of the Cu – 40 Pd alloy in air under 350 °C is considered. After irradiation, a layer of copper oxide CuO was formed on the alloy surface, which under normal thermal conditions forms at the temperature of 400 – 500 °C. Reflections of the ordered β-phase disappeared in the surface layer. The elemental composition of the alloy changed along the distance from irradiated surface of the metal. Phases with low degree of long-range order and an increased palladium content formed. The presence of these phases is caused by selective oxidation of copper.