bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of the Factors Affecting the Quality of Palm Oil Using the Analytical Hierarchy Process Method
Authors: Rahmansyah Nugraha , Armonitha Lusinia Shary , Liana Gema Rima
Published: December 2019

Riau is a province that has many oil palm plantations. One of the industries that manages palm oil is PT. Tasma Puja having the address jl. The kuamang river, kampar, where it produces crude oil or vegetable oils and animal oils. To calculate the quality of palm oil at PT. Tasma Puja is carried out laboratory tests based on water and dirt content, free fatty acid content, color and peroxide number. The process of storing free fatty acid data produced every time the production from laboratory test results is still stored manually using the Microsoft Excel application. By storing these data, there are weaknesses, namely the difficulty in assessing the quality of palm oil production produced. This study was conducted to better analyze and store production data from PT. Tasma Puja. The results of this study will be able to provide benefits to PT. Tasma Pujasehing will later facilitate PT. Tasma Puja in storing and processing palm oil production data. Analysis of these problems uses the concept of decision support systems Analytical Hierarchy Process (AHP) method which is supported by PHP programming applications.
Implementation and Design User Interface Layout Use Leap Motion Controller With Hand Gesture Recognition
Authors: Hendrik Billy , Fauziah  , Masril Mardhiah , Fauzi Wijaya Yunan , Andini Silfia
Published: December 2019

Human Computer Interaction is the study how to design, evaluate, and implement computer systems interactive, the systems can make a dialogue with human. This research was designed and implementation leap motion used hand movements into digital models, which can be used to replace the function of the mouse or keyboard and can provide an alternative in the utilization of hand movements as interactions that the naturally between human and computers and allowing users to input gesture commands into an application in place of a mouse or keyboard. Human gesture recognition as technique interaction for deliver interpretation more natural and for communicating with computers. The aim of this research to find usability leap motion, how effectiveness of the Leap Motion controller for hand gesture recognition for solve important problems in human use of mouse or keyboard. Testing and implementation from this reseach focused are tracking, detection, dynamic, and statis gesture recognation. The result 6 gesture recognation double outward swipe, tap, swipe, clap, circular and fly control tap accuracy of gesture interrpretation data has obtained 87.62%. The uses the data for recognation model has obtain very good and testing with Leap Motion visualizer hand gesture recognation are often sensitive to poor resolution.
Designing a Multimodal Graph System to Support Non-Visual Interpretation of Graphical Information
Authors: Setiawan Deni , Priambodo Bagus , Desi Anasanti Mila , Hazidar Al Hamidy , Naf’an Emil , Masril Mardhiah , Handriani Inge , Kudr Nseaf Asama , Pratama Putra Zico
Published: December 2019

While researchers have performed numerous studies to understand the human interpretation of visual graphs in reading, comprehending and interpreting displayed data; visually impaired (VI) users still face many challenges that prevent them from fully benefiting from these graphs. Thus, it influences their understanding of data visualization and in turn reduces their role in collaborating with their sighted colleagues in educational and working environments. We intend to develop a mobile application where visually impaired users can work together to build a collaborative graph that supported by data sonification in the mobile environment. The system properties were all tested by the task of identifying line trends in time series, which resulted in an accuracy of more than 80% for notes below 20 points. The usability testing has given result of 6.7 out 10 based on users’ perception on the effectivity of the features.
Hybrid cryptography and steganography method to embed encrypted text message within image
Authors: Nassif Jassim Khider , Khudhur Nsaif Ahmed , Kuder Nseaf Asama , Hazidar Al Hamidy , Priambodo Bagus , Naf’an Emil , Masril Mardhiah , Handriani Inge , Pratama Putra Zico
Published: December 2019

The businesses in various fields use the online communication application to gather their data and information with local and global sources. The gathered data may sensitive such as the financial and businesses development information. The hackers or online thief try to stole the valuable data i.e. credit card numbers. The organizations looking for secure online channels in order to transfer their data efficiently and avoid the data thieving. One of the most applicable methods that developed to secure the online transferred data is the cryptography which transfers the original data or information to encrypted formulation. Cryptography still has many drawbacks such as stole and decrypts the original texts using automatic decryption counter. The main aim of this research is to improve the cryptography securing level using supportive method which is Steganography. The Steganography is the processes of hide the data or information in media files such as video, images and audio files. There are four stages represent the methodology of this paper; (1) encrypt the original texts using RSA algorithm, (2) hide the encrypted texts in Image files, (3) extract the encrypted texts from Image files, and (4) decrypt the original texts using decryption key of RSA algorithm. It is expected to improve the security level of the online transferred textual data. The performance of the final results will be evaluated through compare the Image files quality before and after hide the data in these files. The quality of the original and stego Image files need to be same or near in order to maximize the difficulty of detect that there data hide in these files.
The Influence of Inquiry-Based Learning Materials towards Students’ Achievement
Authors: Hariyanto  , Joyoatmojo Soetarno , Nurkamto Joko , Gunarhadi
Published: December 2019

This research aimed at analyzing the influence of midwifery English learning materials based on inquiry towards students’ achievement. The research was a comparative study with pretest-posttest control group design. There were two groups in this research, experiment and control groups. The experiment group consisted of 35 students who taken randomly from 40 students. The control group involved of 32 students that were assigned from 35 students randomly. The experiment group was taught by using English for midwifery learning materials based on inquiry model. The control group was taught by using English learning materials that used to be taught by teacher. Pretest and posttest were treated to all the groups for measuring students’ competency. Data analyzed by using paired t test and independent t test. The result of the study showed that there were difference of students’ achievement before and after giving instruction in both groups and there were difference of students’ achievement between experiment group and control group. The students’ achievement in experiment class were higher than the control group. Based on the research result, the English learning materials were effective to apply in midwifery class. It can promote students’ English achievement.
Practicality of E-Learning as Learning Media in Digital Simulation Subjects at Vocational School in Padang
Authors: Fransisca Monica , Yunus Yuliawati , Dewi Sutiasih Aminda , Permata Saputri Renny
Published: December 2019

This development research produces learning media in the form of E-Learning which is applied to digital simulation subjects at Vocational School in Padang. This E-Learning could improved student learning outcomes on digital simulation subjects. Research and Development (R and D) was used as research methods with Four-D development procedures (Define, Design, Develop, and Disseminate). The type of data that used in this research was primary data. This research used descriptive data analysis techniques by describing the practicality of E-Learning as learning media. The results obtained from this research was the results of the practicality test E-Learning as learning media which are based on the responses of teachers and students in digital simulation learning. The practicality test result shows that E-Learning as learning media has high practical value. Based on the result of the research it can be concluded that E-Learning as learning media is practical for use by teachers and students.
Startup Learning Path (SLP): A Learning Model for Startup Employees Using Agile Learning Approach
Authors: Endeska Putra Egi , Ferdiana Ridi , Hartanto Rudy
Published: December 2019

The growth rate of startup numbers in Indonesia is very high due to the increase of people interest in the technology utilization, particularly Smartphone. However, more than 75% startup that has been increasing has experienced the failure. This is related to many factors, one of which is the lack of qualified Human Resources. This research aims to propose a learning model called Startup Learning Path (SLP), designed using agile methodology approach to be an alternative that can be used by startup to increase the quality of the employees’ competence in supporting the startup to realize the vision and mission.
Designing Lectora Based Interactive CD Learning Media in Basic Programming Subjects (Case Study of Class X SMKN 2 Padang)
Authors: Wijaya Indra , Sefriani Rini , Menrisal  , Radyuli Popi , Andrayani Lili
Published: December 2019

This research and development aims to produce products in the form of Interactive Media CDs for students of class X majoring in software engineering at Padang State Vocational High School 2 based on the lectora inspire application. The research method used is the method of research and development, using the ADDIE development model. The development steps are: (1) Analysis, (2) Design, (3) Development, (4) Implement, (5) Evaluate. Product development validation includes. The results of the assessment by experts in terms of the aspect of content eligibility: 71.00%, language component: 71.25%, presentation component: 71.00%, graphical component: 71.25%. Overall, the validator test evaluation of the Basic Programming Interactive CD Media is 71.13%, so that the level of validity can be interpreted Fairly Valid to be used. The results of the practicality test assessment in terms of the user state: 80.11%, the effectiveness of learning time: 79.60%, benefits: 80.90%. Overall, the practicality assessment of the Basic Programming Interactive CD Media is 80.20%, so that the practical level can be interpreted as practically used. The results of the effectiveness test were reviewed from the aspect of learning pleasure: 79.08%, the presence of interesting teaching materials in learning: 71.50%. Overall, the assessment of the effectiveness.
Analysis System Occupational Health And Safety in coal Underground
Authors: Prabowo H , Prengki I , Amran A
Published: December 2019

Based on the data obtained from the company, the data of occupational accidents that occurred between the years 2016-2017 there were 10 cases of accidents. The causes of such employees ignore APD, buffering systems which do not conform to the rules, and a ventilation system that is still not good. The purpose of this study were: 1) Uncover Management System Occupational Health and Safety are available on the company today. 2) Uncover buffering system underground mining CV. Karya Maju Sejati 3) Uncover the ventilation system underground mining CV. Karya Maju Sejati 4). Revealing how the protection of electrical equipment in underground mines. 5) Find a solution should be done to reduce the risk of accidents at work in the company and measures of prevention/mitigation of hazards in the workplace. Data collected or obtained directly from respondents by direct observation in the field and interviews with management and staff as well as competent employees of the company and nothing to do with the object of research. The data taken is the danger in the workplace environment, work program K3 management, implementation and support of ventilation systems and protection of electrical equipment in underground mines., t.
Wayang beber animation media as an effort for preserving wayang tradition based on information and technology
Authors: Prilosadoso B H , Pujiono B , Supeni S , Setyawan B W
Published: December 2019

The aim of this study is to develop wayang beber animation media that used as a means to preserve the tradition of wayang beber Pacitan. This study was developmental research that consists of 5 phases, including problem identification, planning, design and development, stabilization, and dissemination. The data were stories and pictures of wayang beber, obtained through filed observation and interviewing informants, namely dalang (puppeteers) and expert in animation. Data validity was tested through data triangulation techniques, including source of data and theory. The result of this study produces wayang beber animation media that is disseminated to several government institutions, namely office for culture and tourism, elementary schools, junior high schools and senior high schools in Pacitan District. The existence of wayang beber animation media will supposedly be utilized as a media for introducing wayang beber to community and students in Pacitan District.
Media Development on the Concept Sentence Learning Model based Android for Students with Hearing Impairment
Authors: Mirasandi I P , Akhyar M , Widyastono H
Published: December 2019

This study aims to find out development of android based learning media that adopts the Concept Sentence model for students with hearing impairment, so that their learning outcomes, especially in understanding a social science’s learning materials would increase. The subjects of the study were 30 students from one of the special schools for students with hearing impairment in Surakarta City. The present study was conducted using a research and development method. The data were collected using a questionnaire while Miles and Huberman model of Analysis was employed for the data analysis. The results show that most of the students consider that they had difficulty in understanding the board material of social science, due to the inadequateness of the previous media. The students need a media that come with the required competence to be achieved, clearly and briefly delivered using words and punctuations that can be easily understood by the students. The students wish for an interesting media display and most of them assent on the use of “Belajar IPS itu Asyik dan Menyenangkan” as the title on the learning media’s homepage.
Video as Educational Multimedia to Teach English Speaking
Authors: Fajar Masyitoh Novia , Malihah Noor , Risdianto Faizal , Guritno Agung
Published: December 2019

The aim of this research is to develop an educational multimedia in the form of video as one of media to teach speaking. Research and development design is used to produce an educational multimedia entitled Nginggris Narsis. Procedures of this research includes identification students and teachers need, planning and product design, product small scale tryout, validation of the expert, product revision, product large scale try out and revision, and dissemination. This video is used to teach the first grade students of Junior High School in Indonesia of which curriculum implemented is 2013 curriculum. The results show that NginggrisNarsis is an appropriate material to teach EFL learners in speaking, although there are still some weaknesses found within this video. Nginggris Narsis as educational media to teach speaking help both teachers and students in introducing English as a foreign language for Indonesian students.
Development of e-learning mathematics encyclopedia as learning tools for class viii junior high school
Authors: Dwi Agustin Ririn , Ambarawati Mika
Published: December 2019

The purpose of this study was to describe the development of e-learning-based mathematics encyclopedia as a learning tools and test the validity and eligibility of e-learning based mathematics encyclopedia as a learning tools for junior high school students. The many terms and formulas in mathematics, sometimes make students difficult in learning mathematics. Students often forget to apply a formula to solve certain math problems. To help students in learning mathematics, it is necessary to make a computer software (software) through computer-based learning in the form of a mathematical encyclopedia. The development of e-learning based mathematics encyclopedia that is integrated into learning can be through the development of learning tools. This learning tools can be applied in all devices based online. The use of tools in learning is intended to be able to help overcome various obstacles in the learning process including psychological barriers, physical barriers, cultural barriers and environmental barriers. This research is a development research. In genera, this research will be implemented in three stages, namely: define, design, and develop. The define phase includes the analysis of encyclopedia; the design stage includes the preparation of draft encyclopedia. This research conducted in grade VIII Junior High School. The validation results of expert validators are as follows: encyclopedia with a value of 3, 80 with a worthy category. And the advisability result of students who get value of 3, 95 with a worthy category.
Calculation and analysis of the features temperature behavior of the electrical conductivity semiconductors GeTe and SnTe near structural phase transition TC
Authors: Sankin A , Altukhov V , Mitjugova O , Janukjan E
Published: December 2019

In the article have conducted of the calculation for the temperature behavior of anomalous conductivity of ferroelectric-semiconductors type A4B6 (SnTe and GeTe) near the phase transitions of Tc. The proposed integrated (analytical) model is applicable both to describe temperature behavior of conductivity many-valleys semiconductors GeTe, and type systems the SnTe. Made investigation of the influence of structural phase transition on the conductivity of these systems. The results of the calculations are consistent with data of those experiments.
Magnetotransport phenomena and spin accumulation in MIS structures
Authors: Volkov N V , Bondarev I A , Tarasov A S , Rautskii M V , Lukyanenko A V , Smolyakov D A , Varnakov S N , Ovchinnikov S G
Published: December 2019

The present work is devoted to magnetic transport in Fe/SiO2/p-Si, Mn/SiO2/p-Si and Fe3Si/p-Si hybrid structure. For Mn/SiO2/p-Si diode extremely large values of magnetoresistance were observed (105 % for AC and 107 % for DC) which is explained by impact ionization process that can be suppressed by the magnetic field. Lateral photovoltaic effect in Fe/SiO2/p-Si have also shown a strong dependence on the magnetic field in low-temperature region (the relative change of photovoltage exceeded 103 %). In Fe3Si/p-Si spin accumulation was found via 3-terminal Hanle measurements. We believe that the magnetic field affects electric transport through Lorentz force and through the interface states which are localized at the insulator/semiconductor or metal/semiconductor interfaces. Such states play a decisive role in magnetotrasnport as their energy can be controlled by a magnetic field. In Fe3Si/p-Si they also participate in spin-dependent tunneling, causing spin injection from the Fe3Si film into the silicon.
Optimization of the functional properties in solid-state sulfide materials with the sulfur ion conductivity
Authors: Kalinina L A , Ushakova J N , Pentin M A , Kosheleva E V , Murin I V
Published: December 2019

Possibility of increasing the main functional property, the electrical conductivity in the known solid ionic salts with the conductivity of sulfur ions, by preparing composite mixtures with a semiconductor dopant is considered. The sulfide semi-product BaSm2S4 has been synthesized by using ceramic and chemical technology, as well as dopant ZrS2 and composite mixtures (100–x)BaSm2S4-x mol.% ZrS2 in a wide range of compositions. The study of the morphology and phase composition in the composite mixtures has revealed an ambiguous nature of the phase formation. Influence of the method for obtaining the oxide precursor on the electrical conductivity of a metacomposite based on barium thiosamarate has been investigated. The best compositional effect is achieved for metacomposites with ceramic prehistory. It is noted that in the resulting heterogeneous mixture, the sulfidic nature of the ionic salt conductivity is preserved.
PLD of thin electrochromic WO3 films at room temperature
Authors: Parshina L S , Novodvorsky O A , Khramova O D
Published: December 2019

The amorphous dielectric WO3films have been obtained by the droplet-free pulsed laser deposition method on the quartz and c-sapphire substrates at room temperature and the oxygen pressure from 20 to 60 mTorr. The dependence of the parameters of the obtained films on the oxygen pressure during the growth has been established. The transmission of the WO3 films increases over the whole region under study from 200 to 1000 nm with increase of the oxygen pressure in the process of the film growth on the substrates of both types. The surface roughness of the films poorly depended on the oxygen pressure during the film deposition and was 4-5 nm. The thin-film electrochromic cell with a liquid electrolyte was produced on the basis of the obtained WO3 film. The cell transmission over the spectrum range from 300 to 900 nm is reduced by 30% at a voltage of 2.5 V during the staining time of the order of two minutes.
The current state of the use materials with shape memory effect in the oil and gas and related industries
Authors: Elagina O Yu , Vyshegorodtseva G I , Dubinov Yu S , Dubinova O B
Published: December 2019

This paper discusses the use of materials with shape memory in various industries, including the oil and gas industry. The advantages and disadvantages of metallic and non-metallic materials with shape memory are presented. The possibilities of using composite materials with shape memory in the oil and gas industry are considered. The use of composite materials for the manufacture of diaphragms in diaphragm pumps to increase the energy efficiency of equipment is proposed.
Spectral study of humic substance extract from pressurized oxidizing slag of Carlin-typed gold deposit
Authors: Niu Huiqun , Yang Hongying , Tong Linlin , Zhong Shuiping , Liu Yuanyuan
Published: December 2019

Carbonaceous matters in Carlin-type gold deposit, especially the humic substance, which have a serious preg-robbing effect on the process of cyanidation. In this paper, the humic acid and fulvic acid were extracted from oxidizing slag via pre-activation alkaline-heat method, and using FTIR and UV-Vis spectra to study the molecular structure of humic acid extract and fulvic acid extract. The FITR spectrum demonstrated that hydroxyl, carboxyl and benzene rings characteristic stretching vibration peaks occurred in spectra of humic acid and fulvic acid, but humic acid extract had a finer molecular structure. The result of UV-Vis spectra analysis showed that the extract contained alkyl-substituted benzene ring structure, and the amount of carboxyl groups and hydroxyl groups in fulvic acid molecule was larger than that of humic acid. The fulvic acid extract contained more chromophores, while humic acid molecules have a higher degree of humification and a higher average molecular weight. Although there were some differences in the molecular structure of the both, they were both complex macromolecular organic compounds with a benzene ring as a basic unit.
Structure and magnetic properties of mechanochemically synthesized UHMWPE/ferrite composites as precursors for electromagnetic shielding materials
Authors: Kiseleva T Yu , Ilyushin A S , Lazareva E V , Ivanenko I P , Yakuta E V , Khakhalin A V , Zholudev S I , Kovaleva S A , Devyatkina E T , Grigoryeva T F , Frolov K V , Markov G P , Enhnaran U , Sangaa D
Published: December 2019

In this paper, a study of composite materials based on ultrahigh molecular weight polyethylene (UHMWPE) and magnesium ferrite particles — precursors for electromagnetic shielding materials was carried out. Scanning electron microscopy, X-ray diffraction, Mossbauer and FTIR spectroscopy have been applied to study the influence of structural, morphological and magnetic state of ferrite particles on the composite polymer materials formed by the method of mechanochemical activation in mixtures of ferrites with UHMWPE. It was revealed that synthesis method type showed a significant effect on the size, morphology, crystal structure (inversion parameter) and magnetic properties of ferrite particles. All of these studied parameters determine their functional properties as an independent material, and their properties in the composition of the functional polymer composite material.
Quantum dots in the structure of quasicrystalline systems
Authors: Melnikov G A , Ignatenko N M , Gromkov A S
Published: December 2019

The article shows that in the structure of quasicrystalline systems it is possible the formation of quantum dots, which are potential wells of various forms with quantized motion of an electron or proton, which allowed us to put forward the hypothesis of the existence of a constant component in the infrared radiation of the moon surface.
Unusual properties and features of oxygen nonstoichiometry of La-Sr manganites with manganese replacement by a combination of nickel and germanium
Authors: Karpasyuk V K , Badelin A G , Merkulov D I , Derzhavin I M , Estemirova S Kh
Published: December 2019

When studying manganites of the system La1-cSrcMn1-x(Ni2+
0.5Ge4+
0.5)xO3+γ (x = 0.05; 0.10; 0.15; 0.15 ⩽ c ⩽ 0.35), it was experimentally established that after reductive annealing, which leads the oxygen content to the stoichiometric one, unit cell volume (v) of the samples decreases and at c ⩾ 0.19 it is less than after annealing in oxygen. Based on the analysis of various charge compensation mechanisms using derived dependences of v on the oxygen content and taking into account the changes in magnetic and electrical parameters, it is established that experimental data can be explained only with the allowance for formation of singly charged oxygen ions. The relationships between magnetic parameters of the manganites and their composition, structural characteristics and deviations from oxygen stoichiometry are explained. The possibility of local ferromagnetic ordering of uncompensated spins of Ni2+ ions due to their interaction with singly charged O–
anions is considered.
The critical currents of MgB2 tapes after the shock-wave plasma influence through the protective screens with different thermal characteristics
Authors: Mikhailov B P , Mikhailova A B , Nikulin V Ya , Borovitskaya I V , Silin P V
Published: December 2019

The report presents the researches of the current-carrying characteristics of MgB2 tapes after exposure to shock-wave action through the protective screens with different thermal characteristics. It was used molybdenum, titanium, iron and copper. To implement the shock wave impact, a plasma focus (PF) type setup was used. Current-voltage characteristics (CVC) of the tapes in the initial state and after shock-wave action (SW) through the protective screens are presented. Dependences of critical currents from magnetic field value are measured in the transverse magnetic fields from 0.3 to 6.0 T at the temperature of 4.2 K. The studies performed showed a noticeable change in the critical currents according to the screens material used. The largest increase in Jc (more than 2 times up to 850 A in transverse and longitudinal magnetic fields up to 1 T) was achieved in case of titanium screen.
Design of composite members with curvilinear fiber trajectories
Authors: Polilov Alexander N , Tatus Nikolay A , Tian Xiaoyong , Hao Liu
Published: December 2019

The design possibility of shaped constant area composite tensile test specimen and leaf spring is shown and the last can provide by chosen geometry threefold mass reduction for the given level of stored elastic energy. The use of unidirectional GFRP (glass fiber reinforced plastic) makes it possible to reduce the mass by approximately 15 times in compare with the steel analog for the same strength and stored energy requirements. The curvilinear trajectories of fibers tracing around the hole or rivet/bolt connection make it possible to increase load carry capacity many times.
Enhanced mechanical properties and wear resistance of 2024Al alloy with CeO2 addition
Authors: Lv Zheng , Liang Qiushi , Mao Changhui , Yang Zhimin , Yang Jian , Dai He
Published: December 2019

In this work, a study of the mechanical properties and wear resistance of CeO2 reinforced 2024Al matrix composites have been performed using servohydraulic universal testing machine and ball-on-disk wear system. The composites were fabricated through powder sintering and hot extrusion followed by T4 heat treatment. Matrix of pure 2024Al was used to which different mass fractions (0.2%, 0.5%, 1.5%, 2.5% and 4.0%) of CeO2 were added. Tensile tests were performed at room temperature and velocity of 2.0 mm/min. As the CeO2 content increased, mechanical properties were firstly increased and then decreased. The UTS, YS and elongation reached maximum values at 0.5 mass.% CeO2 addition, which were increased by 11.6%, 13.3% and 20.7% as compared to those of pure 2024Al alloy, respectively. While, wear tests were carried out under loads of 5-20 N with sliding velocity of 0.05 m/s for 60 min. For 0.5 mass.% CeO2/2024Al, the decrements in volume loss and average COF and maximum COF under load of 10 N were 48.0% and 35.3% and 8.1% respectively as compared with pure 2024Al, and the decrements in volume loss and average COF and maximum COF under load of 20 N were 34.0% and 2.3% and 8.9% respectively as compared with pure 2024Al. Therefore, both mechanical properties and wear resistance of 2024Al alloy were markedly enhanced through trace CeO2 addition.
Effect of carbon and manganese contents on intra-granular acicular ferrite nucleation in steel containing nanoparticles
Authors: Gao Xiangzhou , Du Kaiping
Published: December 2019

In the present study, the experimental steels containing nanoparticles were manufactured under different mass fractions of C and Mn. A systematic analysis of inclusion characteristics, Intra-granular acicular ferrites (IAF) inducing potency of active inclusions, and microstructure morphologies revealed that Al2O3-MgO had the largest number fraction with higher inducement ratios than other inclusions. Steel samples containing 0.21wt% C contained the largest share of fine acicular ferrite (AF) than other samples due to relatively stronger inducing potency of active inclusions on IAF. On the other hand, the underlying microstructures in steel samples with Mn content less than 0.6wt% were due to weaker inducing potencies of active inclusions on IAF.
Behaviour of the 16%Cr ODS ferritic steel intended for nuclear fusion power industry after tests in the conditions of irradiation in the Dense Plasma Focus facility PF-1000U
Authors: Demina E V , Gribkov V A , Prusakova M D , Pimenov V N , Sirotinkin V P , Paduch M , Rogozhkin S V
Published: December 2019

Fe-16Cr ODS ferritic steel with oxide nanoparticles fabricated by mechanical alloying method have been subjected to radiation tests using PF-1000U facility with subsequent analytical examination of exposed samples.
Functionalization of tissue equivalents based on sodium alginate by human blood plasma
Authors: Teterina A Yu , Solovieva E V , Baranov O V , Zobkov Yu V , Komlev V S
Published: December 2019

The work is aimed at the development of biodegradable porous frame materials that combine high biocompatibility and possess pro-angiogenic properties, that is, the ability to ensure the active germination of the vessels of the recipient tissue and, possibly, the formation of the de novo vascular bed. Approaches have been developed to create a two-layer matrix structure based on biopolymers - sodium alginate and collagen. The two-layer structure provides the functions of the skin - protective (from external environmental factors) and regenerative - restoration of epithelial tissues of the dermis. The article shows the functionalization of the polymer framework by growth factors — enriched and depleted human blood plasma in different concentrations from 5 to 25 masses. % Methods of functionalizing the polymer matrix were studied and the influence of the inclusion of growth factors on cyto- and biocompatibility, angiogenic properties was established.
Studies on the opportunities of producing superpure graphite from the high-carbone rocks of the Jiamusi-Hankaiskaya province
Authors: Molchanov V P , Medkov M A , Sun Fengyue
Published: December 2019

The results of the research of the conditions of the purification of the natural graphite with the usage of the processes of the hydrodifluoride technology are given. The interaction of the major impurity elements of the concentrate with NH4HF2 resulting in the formation of the complex fluorine ammonium salts and simple fluorides is established to occur during processing of the graphite concentrate with ammonium hydrodifluoride. Conducting the fluoridization with usage of 20% of surplus of NH4HF2 has been found to allow reaching the complete fluoridization of the impurity components which are present in the graphite. The complex fluorine ammonium salts and the fluorides of alkaline metals have appeared to be removed from fluoridated concentrate by means of the water leaching.
Synthesis of a Cu2SnS3 ternary compound by thermal annealing of a metal layer in sulfur vapor
Authors: Budanov A V , Vlasov Yu N , Kotov G I , Rudnev E V , Ternovaya V E , Ivkov S A
Published: December 2019

A method for forming thin films of the Cu2SnS3 compound homogeneous in phase composition for use in solar cell devices is proposed. The Cu-Sn alloy layers deposited by thermal spraying in vacuum were annealed in sulfur vapor in a graphite chamber of the quasi-closed volume type. Using X-ray phase analysis, the optimal conditions for the formation of Cu2SnS3 films homogeneous in phase composition were found: annealing temperature 450 °C, sulfur vapor pressure ∼ 0.2 torr. The sulfide layers obtained in this way in their elemental composition correspond to the Cu2SnS3 compound stoichiometry. Cu2SnS3 films have an optical band gap of 1 eV, and the absorption coefficient in the visible region of the spectrum is 2·105 cm –1.
Sol-gel synthesis and determination of optimal sintering conditions of the Li6.75La3Zr1.75Nb0.25O12 solid electrolyte
Authors: Il’ina E A , Lyalin E D , Antonov B D , Pankratov A A
Published: December 2019

Solid electrolytes are widely used in electrochemical devices. Among these materials, electrolytes with the lithium-ion conductivity can be used in high-energy lithium and lithium-ion power sources. The perspective Li6.75La3Zr1.75Nb0.25O12 solid electrolyte was synthesized by modified sol-gel synthesis method using the sparingly soluble Nb2O5 as one of the initial compounds. The influence of pressure and final sintering temperature on phase composition, density and lithium-ion conductivity was studied. Solid electrolyte obtained at 1150°C was single phase and had a cubic structure with the space group Ia-3d. Thus in the presented work, the cubic modification of Li6.75La3Zr1.75Nb0.25O12 was obtained by thermal treatment for 1 h at 1150°C (versus 36 h at 1200°C in the literature). Moreover at this temperature the samples had the highest density and total lithium-ion conductivity (3.9·10–5 Scm–1 at 25°C). According to the SEM study ceramic samples have a dense structure with a particle size ∼1-3 μm. Solid electrolyte was also obtained by isostatic pressing at a pressure of 500 MPa but the values of density and total lithium-ion conductivity were comparable with that of the samples compressed statically.
Formation mechanism of island CoO in La-Sr-Co-Fe oxygen transport membrane deposited by low pressure plasma spraying-thin film technology
Authors: Niu Shaopeng , Zhou Kesong , Deng Chunming , Xu Liping , Liu Min , Zeng Wei , Chen Zhikun
Published: December 2019

Dense oxygen transport membranes (OTMs) made from mixed oxygen ionic and electronic conductors (MIEC) have attracted intense research interest owing to their unmatched advantages on pure oxygen production, oxygen-fuel combustion and oxygen-related catalytic processes over traditional techniques. As one kind of the most-studied membranes, cobalt-containing membranes have unsatisfied thermal stability, though the oxygen permeability of these membranes is generally excellent due to the existence of cobalt. However, in situ forming CoO phase which were observed in the cobalt-containing membranes prepared by low pressure plasma spraying-thin film technology (LPPS-TF), were found to exhibit a remarkable stabilizing effect in the preliminary work. As one of the main premises to reveal the stabilization mechanism of these island CoO phase, their formation mechanism were studied in the first place in the paper.
Thermoelectric and mechanical properties of Bi0.4Sb1.6Te3 solid solution extruded from granules obtaining by melt crystallization
Authors: Ivanova L D , Granatkina Yu V , Malchev A G , Nikhezina I Yu , Emelyanov M V , Nikulin D S , Lavrentev M G
Published: December 2019

The microstructure, composition, mechanical and thermoelectric properties of samples cut from different sections of a rod with a diameter of 20 mm, a length of 300 mm, extruded from a briquette pressed from granules obtained by crystallization of Bi0.4Sb1.6Te3 solid solution in water were investigated. It was established that the composition of the samples does not change along the length of the rod, while there is a small amount of the second phase (tellurium-based eutectic) is observed both at the beginning and at the end of the rod. A compression test at room temperature showed that the ultimate strength of specimens cut from the end of a rod is ∼10% higher than that of specimens cut from the middle Thermoelectric parameters (electrical conductivity, thermal conductivity, Seebeck coefficient and thermoelectric figure of merit) at room temperature of samples cut from different areas of the rod were σ = 814 ± 55 S/cm, k = 13.2 ± 0.3 W/cm K, α = 234 ± 5 µ V/K, ZT = 0.93-1.12. Measurements of the thermoelectric properties of these samples in the temperature range of 100-600 K showed that the intrinsic conductivity occurs at temperatures above 450 K. The maximum thermoelectric figure of merit ZT
max = 1.2 ± 0.1 was obtained at a temperature of 340 K.
Low-alloyed molybdenum single crystals: preparation, structure and properties
Authors: Burkhanov G S , Yusupov V S , Kirillova V M , Sdobyrev V V , Dement’ev V A , Dormidontov N A , Mikhailov B P , Ermishkin V A , Minina N A
Published: December 2019

Investigation concerns the method of preparation of low-alloyed molybdenum single crystals directly from molybdenum rods and wire, rod or foil containing the appropriate alloying metal, excluding the stage of pre-fusion of the components in an arc furnace, which is more economical than traditional method. In this way Mo-W, Mo-Ta (1,5 wt.% alloying elements of each) and Mo-Re (2 and 3 wt.%) single crystals were prepared by electron-beam zone melting. Authors discuss in more detail the structure and structural parameters of prepared single crystals. Some structural features of Mo-2 wt.% Re and Mo-3 wt.% Re single crystals are explained. Moreover the coefficient thermal linear expansion (CTLE) was measured for Mo-Re single crystals. As shown the proposed method ensures the preparation of single crystal even in single stage melt. The structural imperfections may be removed by following re-melting.
Dynamic task assignment method based on NSGA-II algorithm in command and control field
Authors: He Yichao , Wang Xun , Jiao Zhiqiang , Zhang Jieyong
Published: December 2019

In order to improve the adaptability of command and control organizations to complex operational environments and effectively solve the unexpected events that may be encountered in the operation of C2 organizations, this paper studies the dynamic task assignment of C2 organizations and proposes multi-objective tasks assignment method based on NSGA-II algorithm. Firstly, two kinds of emergencies such as platform damage and task increase in the course of combat are analyzed, and the mathematical expression method is given. Secondly, a multi-objective optimization model aiming at maximizing task completion quality and minimizing plan adjustment cost is constructed. And the adaptive NSGA-II algorithm is designed to solve the model. Finally, the simulation experiment shows that the constructed model can effectively deal with the above-mentioned emergencies, and the designed algorithm can obtain the better Pareto frontier and realize the dynamic task assignment.
The alternate iterative Gauss-Seidel method for linear systems
Authors: Pu Bingyuan , Yuan Xun
Published: December 2019

In this paper, we present an alternate iterative Gauss-Seidel method for linear systems. The spectral radius of the iteration matrix and the convergence of the proposed method are discussed. Finally, the numerical examples are provided to confirm our theoretical analysis and demonstrate the efficiency of the new method.
Peter Chew rule for solution of triangle
Authors: Chew Peter
Published: December 2019

Objectives Peter Chew rule: is to let upcoming generation solve same problem can solve directly, more easy, more accuracy compare what’s now solution. With sine rule, cosine rule and Peter Chew rule, all problem at solution of triangle can solve directly more easy, more accuracy. Peter Chew rule are complement rule of topic solution of triangle.
A multiwavelength study of the Sunspot of active region which leads to X 17 solar flare
Authors: Mohd Norsham Nur Amira , Sharizat Hamidi Zety
Published: December 2019

This paper focuses on the study of active region (AR) 486 from the 171 Å wavelength in conjunction with solar radio burst data from the e-CALLISTO. This active region produced quite a strong solar flare with the X 17 class on 28th October 2003. The intense solar flare was detected by the CALLISTO system as the type III solar burst. Another data for this study were collected from the online database of Solar Monitor and Space Weather Live website where they provided the data from NOAA and SDO/AIA publicly. The study of the solar flare event was done by observing the sunspot for the past six days to see the changes in the magnetic field of the active region 486 and compared it to the solar radio data for the nature of the solar flares. The active region 486 alone had a sunspot number of 74 which is quite high, hence it produced a flare with the solar wind speed of 800 km/s and a solar radio burst type III with the storm type. The frequency drift rate for the solar burst was 2.15 MHz/s which proved that this type III is a fast drift burst. It was also recorded that the coronal mass ejection followed this solar flare event with the speed of nearly 2000 km/s and directed toward the Earth which then produced intense geomagnetic storm on the Earth the next day.
Using a novel grey model to forecast the unconventional water sources supply volume in China
Authors: Chen Lin , Liu Zhibin , Ma Nannan
Published: December 2019

Unconventional water resources are an important part of fresh water resources, which can help relieve pressure of water supply and further a sustainable development could be achieved, especially in China. In this paper, a novel optimize fractional order polynomial grey model is proposed, which is abbreviated as OFOPGM (1,1). The novel grey model is validated and calibrated and forecast the unconventional water sources supply volume in China. The forecast results prove the validity and practicability of the novel model.
Automatic code parallelization for data-intensive computing in multicore systems
Authors: Subramanian Ranjini , Zhang Hui
Published: December 2019

A major driving force behind the increasing popularity of data science is the increasing need for data-driven analytics fuelled by massive amounts of complex data. Increasingly, parallel processing has become a cost-effective method for computationally large and data-intensive problems. Many existing applications are sequential in nature and if such applications are ported to multi-processor systems for execution, they would make use of only one core and the optimal usage of all cores is not guaranteed. Knowledge of parallel programming is necessary to ensure the use of processing power offered by multi-processor systems in order to achieve better performance. However, many users do not possess the skills and knowledge required to convert existing sequential code to parallel code to achieve speedups and scalability. In this paper, we introduce a framework that automatically transforms existing sequential code to parallel code while ensuring functional correctness using divide-and-conquer paradigm, so that the benefits offered by multi-core systems can be maximized. The paper will outline the implementation of the framework and demonstrate its usage with practical use cases.
Multi-objective optimal operation of renewable energy hybrid CCHP system using SSO
Authors: Yeh Wei-Chang , Lai Chyh-Ming , Peng Yi-Fan
Published: December 2019

In recent years, the amalgamation of renewable energies into combined cooling, heating and power system (CCHP) become a popular research in energy field. In order to improve the energy utilization of renewable energies integrated the CCHP (RECCHP) system, it is necessary to optimize the operation and component capacity in the RECCHP system. A multi-objective optimization model characterizing the system daily operation cost, daily carbon dioxide emission, and primary energy saving rate is established. Considering each objective function, Simplified Swarm Optimization (SSO) is applied as a single objective optimization problem to find the best capacity of components and operation of the system. Further, normalize three objective respectively and use Analytic Hierarchy Process to get weight for each objective. Transform the multi-objective optimization problem into a single objective optimization problem. Finally, taking a historical weather data in winter of Kinmen Island, Taiwan, as a case study, solve the problem with SSO, and the experiment results are compared with traditional energy systems. The results show that the RECCHP system is better than traditional energy systems among economic, environmental and energy aspect.
Stress analysis of orthotropic plate based on complex variable method
Authors: Jia Purong , Wang Gang , Zhang Long , Jia Cheng , Suo Yongyong
Published: December 2019

Typical stress boundary problem for a wedge with orthotropic materials is considered. The complex variable functions including a material parameter are fully analyzed for solving the partial derivation equation. By constructing new stress function, the mechanic analysis of the wedge subjected to a concentrated force is carried out. The stress boundary problem and the governing equation are resolved. The formulae of stress fields in rectangular and polar coordinates are derived for the wedge.
Kinematics Simulation of Welding Manipulator Based on V-REPPRO EDU
Authors: Muslikhin  , Irmawati D , Arifin F , Nasuha A , Hasanah N
Published: December 2019

As the primary tool in modern industrial welding, 6 DOF manipulator robots can weld in all positions. In this context, Danevit-Hartenberg parameters were developed to simplify kinematics equations for manipulator equations. Inverse kinematics is obtained based on the algebraic method. Simulation of kinematics manipulators based on V-REP PRO EDU is present. Kinematics simulations produce processing motion and relevant kinematics curves. The simulation results and kinematic equations of robotic manipulators are compared, showing that valid kinematic equations and weld trajectories can be passed by the end-effector successfully.