bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of Learning Media Using Android-Based Articulate Storyline Software for Teaching Algebra in Junior High School
Authors: Arum Nissa Amanda Dinda , Toyib Muhamad , Sutarni Sri , Akip Erwin , Kadir Surni , Ahmad  , Solikin Asep 
Published: January 2021

Abstract
Mathematics is a science that deals with the study of abstract forms so that it requires objects or visual aids to concretize them to become more tangible and clear. Science and technology has developed rapidly in education, one of which is an android-based learning media. The purpose of this study was to develop an Android-based learning media on mathematics specifically in the form of algebraic for students in grade VII of SMP Negeri 2 Kartasura. Furthermore, after the development, the validity and feasibility tests were conducted by media experts, material experts, learning practitioners and students. This research conducted by Research and Development (R&D) method. In its development, 6 stages must be passed namely the analysis phase, the planning phase, the development phase, the verification phase, the validation phase, and the final phase with the learning media called OBAR. The developed media was feasible with the result of validation from media experts obtaining an average score of 3.94, was valid. The result of the validation from material experts obtained an average score of 4.5, was very valid. The results of validation by learning practitioners obtained an average score of 4.2, was valid. Moreover, the validation of the students’ responses obtained an average score of 4.54, was most feasible category.
Visual, Auditory, and Kinesthetic Students: How They Solve PISA-Oriented Mathematics Problems?
Authors: Ishartono Naufal , Faiziyah Nuqthy , Sutarni Sri , Putri Amalia Budiana , Fatmasari Lina W S , Sayuti Muh , Rahmaniati Rita , Yunus Melor Md 
Published: January 2021

Abstract
Mathematical problems are given to students to train themselves in their thinking skills and to find out the level of thinking that each student has. Mathematical problem solving is influenced by the level of students’ thinking ability. The purpose of this study was to analyze students’ high-order thinking skills in solving PISA-oriented math problems in terms of learning styles. This type of research is a mix method with a Concurrent Triangulation Strategy design. The population of all students of class X SMA Negeri 2 Surakarta samples in the study of several students in the population. The sampling technique used purposive sampling. Data collection techniques using interviews, documentation, and tests. The results of the study: 1) There was no difference in ability between students’ visual, auditory and kinesthetic learning styles in solving PISA-oriented math problems. 2) There are 23 students who have a visual learning style or 70% of the population. 30% of them are in the high category, 44% are in the medium category, and 26% are in the low category. 3) There are 8 students who have an auditory learning style or 24% of the population. 62.5% of them are in the medium category, and 37.5% are in the low category. 4) There are 2 students who have a kinesthetic learning style, the two students are one in the medium category and one in the low category. In general, each visual auditory and kinesthetic student has the ability to analyze, evaluate, and create as part of the higher order thinking component. However, each of them has a weakness in these abilities.
Metacognitions of Senior High Students in Solving Mathematics Problems
Authors: Narimo Sabar , Sutama  , Prayitno Harun Joko , Fuadi Djalal , Novitasari Meggy , Setiawan Oki , Handayani Tri Kinasih , Rahim Fauziah Abdul 
Published: January 2021

Abstract
This is an ethnographic qualitative research of which three main objectives are to describe the 1) advanced, 2) intermediate, and 3) low metacognition levels in solving mathematics problem. In conducting the research, purposive sampling technique was used to determine the research subjects that were the students (i.e. the students with advanced, intermediate, and low metacognition levels) of X IPA 3 class of SMA Negeri 2 Surakarta. The data were collected through observations, documentations, and interviews in which the data validity was measured using triangulation between the sources and the methods used. Afterwards, the data were analyzed inductively. The results of this research suggested that: 1) students with advanced metacognition level are able to perform all the characteristics of awareness aspect in indicator A1, three characteristics of evaluation aspect of indicator E1, and two characteristics of regulation aspect in indicator R1, 2) students with intermediate metacognition level are able to perform four characteristics of awareness aspect in A1, two characteristics of evaluation aspect in E1 indicator, and two characteristics of regulation aspect in R1, 3) students with low metacognition level are able to perform two characteristics of awareness aspect in A1, two characteristics of evaluation aspects in E1, and one characteristic of regulation aspect in R1.
Determinant Factors of Responsibilities and its Impact on Mathematics Learning Outcome of Junior High School Students
Authors: Sutama  , Nur Hafida Siti Hadiyati , Prayitno Harun Joko , Machromah Isnaeni Umi , Kusuma Nadia Trisha , Nurhidayat  , Fatchurahman M. 
Published: January 2021

AbstractThe purpose of this article is twofold: 1) Testing the communication support and organizational culture for learning outcomes in Mathematics indirectly through learning responsibilities, 2) Testing communication support, and organizational culture for learning responsibilities. The research type is correlational quantitative. The study population was 267 students of SMP Negeri 2 Kartasura, Sukoharjo, in 2019/2020. A sample of 160 students was determined by the Slovin formula. Sampling was done by proportional random sampling by lottery. Data collection techniques were carried out with documentation and a closed questionnaire. Data analysis techniques employed path analysis. The results of the study revealed that 1) there was no communication support, school organizational culture, and learning responsibility jointly for mathematics learning outcomes with α = 0.05. Partially, communication, organizational culture, and responsibility significantly supported direct learning outcomes in mathematics. 2) Communication and organizational culture simultaneously supported learning responsibilities with α = 0.05. The amount of communication support and organizational culture simultaneously towards learning responsibilities was 4.9%. Communication support for learning responsibilities was 2.0164%. Besides, organizational culture support for learning responsibilities was 2.56%.
Research High Temperature Characteristics of 4.5kV New Power Semiconductor Device with Wave-based RC-GCT Structure
Authors: Zhao Bo , Luo Xianghua , Tang Chuan , Song Qingchao , Lu Lifu , Xu Baobo 
Published: January 2021

Abstract
In this paper, the effect of temperature change on the static and dynamic characteristics of power semiconductor devices is simulated by ISE-TCAD software with 4.5 kV power semiconductor device wavy base regions RC-GCT. the results show that the forward voltage drop UF of the device increases with the increase of temperature at high current density, the forward opening and turning off time of the device becomes longer, and the trailing current increases. The results of this study have certain reference value for the design and development of IGCT for new power semiconductor devices.
A Hybrid LED Sink Driver Combining a Buck-Boost Converter and a Switched-Capacitor Step-Up Converter with Nested Topology
Authors: Eguchi K , Shibata A , Do W , Asadi F 
Published: January 2021

Abstract
For LED lighting applications, this paper presents a novel light emitting diode (LED) sink driver with high voltage gains. Unlike traditional LED sink drivers, the proposed LED sink driver consists of a buck-boost converter and a switched-capacitor (SC) step-up converter with nested topology, where an input voltage is converted twice by cascading these two converter blocks. Therefore, the proposed hybrid topology enables the LED sink driver to achieve not only flexible control of an output voltage but also high voltage gains and few passive components. The characteristics of the proposed LED sink driver are investigated by theoretical analysis, simulation program with integrated circuit emphasis (SPICE) simulations, and breadboard experiments. In the performed simulations, the power efficiency of the proposed driver reaches about 80 % at 500 mW when the duty factor is 0.5. Furthermore, the experiment demonstrates high voltage gains and flexible controllability of an output voltage.
Research and Development Scheme of Zero Line Live Fault Device for Low Voltage Overhead Line
Authors: Zhenyu Mao , Hongzhi Zhou , Hui Huang , Ming Tang 
Published: January 2021

Abstract
In order to reduce the frequency of zero line live faults on overhead lines in low-voltage stations and shorten the time for maintenance and repair when zero line live faults occur, the existing zero line live fault repair methods are summarized, and the Preventive measures, and proposed a fast fixed-point device research scheme for the live line zero line live fault of low-voltage overhead lines. The simulation criterion of live line live fault of the zero line is studied with the help of simulation software such as ATP-EMTP. Live fault type identification model to improve the accuracy of fault type diagnosis. It is expected that the location of the zero line live fault can be located in a shorter time. This solution will greatly reduce the manpower and material input during the live line maintenance work. Maintenance time has engineering transformation value.
Ultra-Low Power Current Reference Based on Flat Band Difference of MOSFETs
Authors: Shinde Suhas Vishwasrao 
Published: January 2021

Abstract
In this paper, an ultra-low power MOS current reference circuit is presented. It is based on the flat band voltage difference of oppositely doped polysilicon gate MOSFETs which are operated in weak inversion. It describes a method to achieve zero temperature coefficient of reference current at target temperature. Simulation results show 20nA reference current with temperature drift of 165ppm/°C. Simulated 3σ monte carlo process and mismatch variation of current is 11.2nA. After trimming it is reduced to 808pA. Typical quiescent current is 22.5nA at 3.75V nominal supply voltage.
An alternative ex vivo method to evaluate the osseointegration of Ti–6Al–4V alloy also combined with collagen
Authors: Veronesi Francesca , Torricelli Paola , Martini Lucia , Tschon Matilde , Giavaresi Gianluca , Bellini Davide , Casagranda Veronica , Alemani Fabio , Fini Milena 
Published: January 2021

Abstract
Due to the increasing number of orthopedic implantation surgery and advancements in biomaterial manufacturing, chemistry and topography, there is an increasing need of reliable and rapid methods for the preclinical investigation of osseointegration and bone ingrowth. Implant surface composition and topography increase osteogenicity, osteoinductivity, osteoconductivity and osseointegration of a prosthesis. Among the biomaterials used to manufacture an orthopedic prosthesis, titanium alloy (Ti–6Al–4V) is the most used. Type I collagen (COLL I) induces cell function, adhesion, differentiation and bone extracellular matrix component secretion and it is reported to improve osseointegration if immobilized on the alloy surface. The aim of the present study was to evaluate the feasibility of an alternative ex vivo model, developed by culturing rabbit cortical bone segments with Ti–6Al–4V alloy cylinders (Ti-POR), fabricated through the process of electron beam melting (EBM), to evaluate osseointegration. In addition, a comparison was made with Ti-POR coated with COLL I (Ti-POR-COLL) to evaluate osseointegration in terms of bone-to-implant contact (BIC) and new bone formation (nBAr/TAr) at 30, 60 and 90 d of culture. After 30 and 60 d of culture, BIC and nBAr/TAr resulted significantly higher in Ti-POR-COLL implants than in Ti-POR. No differences have been found at 90 d of culture. With the developed model it was possible to distinguish the biomaterial properties and behavior. This study defined and confirmed for the first time the validity of the alternative ex vivo method to evaluate osseointegration and that COLL I improves osseointegration and bone growth of Ti–6Al–4V fabricated through EBM.
Increasing lifetime maximum intensity of rapidly intensifying tropical cyclones over the western North Pacific
Authors: Song Jinjie , Klotzbach Philip J , Duan Yihong 
Published: January 2021

Abstract
The long-term trend in the annual mean lifetime maximum intensity (LMI) of rapidly intensifying tropical cyclones (RI-TCs) over the western North Pacific (WNP) is investigated in this study. During 1970–2019, a notable upward trend is observed in the average RI-TC LMI, which is primarily linked to a significant increase in the mean intensification rate prior to LMI. This intensification rate increase is caused by an increase in the mean magnitude of RI cases. By contrast there is no significant change in the RI ratio, which is calculated as the proportion of 24 h RI records to all 24 h records before a RI-TC reaches its LMI. Furthermore, there is a significantly greater RI magnitude west of 155° E, where the vast majority of RI cases occur on average. Over this region, there are significant increases in sea surface temperatures, TC heat potential, 700–500 hPa relative humidity and 200 hPa divergence during 1970–2019. Only a small region of significantly reduced 850–200 hPa vertical wind shear is observed to the northeast of the Philippines from 1970–2019. These results imply that both thermodynamic and dynamic variables play an important role in modulating RI magnitude over the WNP.
The continuous spontaneous localization layering effect from a lattice perspective
Authors: Adler Stephen L , Bassi Angelo , Carlesso Matteo 
Published: January 2021

Abstract
For a solid lattice, we rederive the continuous spontaneous localization (CSL) noise total energy gain of a test mass starting from a Lindblad formulation, and from a similar starting point rederive the geometry factor governing center of mass energy gain. We then suggest that the geometry factor can be used as a way to distinguish between low temperature cantilever motion saturation arising from CSL noise, and saturation arising from thermal leakage.
CHINESE, PAKISTANI AND INDIAN POLICY IN THE ARCTIC AND RUSSIAN STANCE
Authors: Krasnozhenova E E , Kulik S V , Pronina V , Yu Eidemiller K , Karabushenko P L 
Published: January 2021

Abstract
The article is dedicated to outlining possible ways of extending Russian presence in the Arctic through cooperation with the Asian emerging economies (namely China, India and Pakistan). In the first part Beijing, Delhi, Islamabad ambitions in the circumpolar north are analyzed. For more comprehensive analysis the insight into tensions withing China-India-Pakistan triangle is given. In the second part the author demonstrates existing formats of Russian cooperation with China and India (both bilateral and multilateral ones). The scheme of establishing mutually beneficial Moscow-Beijing cooperation, based on both sides` advantages and weaknesses, is elaborated.
Environmental control: from inertia of the standard biomonitoring to speed of the online one
Authors: Gudimov A V , Komarova E P 
Published: January 2021

Abstract
Standard biomonitoring system based on sampling technology is not capable of efficient environmental control and ecosystem protection from anthropogenic impacts and followed degradation because of its extremely delayed response to any environmental changes and pollution first of all. Contemporary approach to ecological biomonitoring turns to on-line control of environmental safety. New online technologies and systems of ecological control based on monitoring of the activity parameters in some species-biosensors have been intensively introduced in many countries since 90s as biological early warning systems (BEWS) such as Musselmonitor. The next step is the development of up-to-date technology from simple BEWS to online biosensor monitoring (OBM) in natural ecosystems as a promising tool for immediate detecting of environmental changes and aquatic toxicity in particular. The first technology of online ecological monitoring has been developed in MMBI (1985-2016) from basic to applied research. It was established, that to obtain the reliable OBM technology the background behavior must be properly investigated for long time prior to online-biomonitoring implementation in the field. Nowadays the main task for online biosensor monitoring is the bioindication technology for recognizing of any harm pollution effects online in any time span.
Obtaining carbohydrate biopolymers (prebiotics) from brown algae
Authors: Sokolan N I , Kuranova L K 
Published: January 2021

Abstract
The article discusses the issues of obtaining prebiotic food additives - an actual area of research in modern food technology. The test results determined the safety of the brown algae Ascophyllum nodosum and Fucus vesiculos growing on the littoral of the Barents Sea. Fucus algae contain significant the amount of alginic acid in terms of absolutely dry weight (a.d.w.) which proves the possibility of using them as raw materials for the production of sodium alginate. It was shown in the work that it is preferable to use Fucus vesiculosus for this purpose, since the content of alginic acid in it and the yield of finished products are higher. Studies of frozen algae in storage revealed a significant loss of water even after a month of storage of raw materials, while during storage of dried algae, the qualitative composition of the product remains constant. The properties of sodium alginate samples obtained from different types of fucus algae were studied. It was found that sodium alginates in appearance represent a free-flowing substance in the form of small thin plates, from light to dark brown in color, without taste and odor. Fucus sodium alginate can be used as a prebiotic, since it is a highly viscous biopolymer and belongs to natural dietary fiber.
Problems and perspectives of the ineffective gold-bearing deposits development
Authors: Latysheva M A 
Published: January 2021

Abstract
This article discusses the problems and prospects of mining placer gold not only in the Trans-Baikal Territory but also in Russia as a whole. The reduction of reserves in placers and a decrease in the quality of minerals in them open up new prospects for the extraction of this precious metal. The ineffective placers, of which, according to preliminary estimates, there are approximately 600 in the Trans-Baikal Territory, can become promising objects in gold mining. However, there are some negative factors that will complicate the gold mining operations. The mining of alluvial gold, even with the best existing technologies, remains a sector of high environmental risk; in many settlements, a gradual decrease in the population and the “extinction” of settlements is predicted, whereas illegal gold mining is gaining traction. Neither the regional nor the federal institutions of environmental supervision are now able to resist the destruction and degradation of nature from the mining of placer gold. In general, this leads to an increase in the negative impact of alluvial gold mining on natural systems and the socioeconomic sustainable development of the regions and municipalities, in which this type of activity is carried out, as well as an increase in accumulated environmental damage. The presented organizational and economic mechanism for the development of ineffective placers will contribute to solving the problems observed in the industry and will allow the implementation of measures proposed by public persons.
Defining the rate of air emissions fee
Authors: Ivanova M P , Tagaeva T O 
Published: January 2021

Abstract
Industrial production disturbs the balance of an already delicate environment, and there is a negative impact on the microclimate in the area that is imposed due to cross-regional pollution. The essence of the problem is the movement of hazardous air pollutants throughout the atmosphere over the long distances, and the issue of government control over the air emissions acquires cross-regional significance. Additionally, particular attention should be paid to the question of payment for air emissions. Today, the economic instruments to reduce the negative environmental impact and to ensure compliance with the environmental regulations are only partially applied. All mentioned above underline the need for consideration of the given problem, which can be solved by the additinal method. Therefore, the authors of the present paper suggest a method to define the rate of air emissions fee (currently there are no rates applied). Besides, it should be stressed that this method would allow for effective calculation of payments for harmful pollutant discharge into air. The research outcomes can be used to further develop environmental regulations.
The transformation and dynamics of land resources in the Trans-Baikal Territory
Authors: Pomazkova N V , Faleychik L M 
Published: January 2021

Abstract
We investigated the structure of land resources in the Trans-Baikal Territory and considered the dynamics of various land categories from 2000 to 2019. There are no significant shifts in the distribution of land between land users. Over the past decades, there has been an increase in the lands of specially protected natural areas and the forest lands at the expense of agricultural lands and land reserve. The total area of agricultural land is 7,985.8 thousand hectares or 18.5% of the region’s area. The results of the analysis allow us to conclude that in the Trans-Baikal Territory, the possibilities for a significant increase in arable land are very limited. According to our estimates, approximately 65% of the area in the region is elevated areas, and 67.1% of the area is slope areas. Moreover, most areas in the municipal districts can be classified as zones with erosion-prone conditions for agriculture. The analysis of the land resources in the Trans-Baikal Territory using geoinformation technologies revealed the terrain features of the municipal districts in the context of the slopes. The existing economic and environmental risks of land involved in the industrial and agricultural production require a transition to adaptive landscape land-use systems.
Professional training future geography teachers
Authors: Tyunkova I A 
Published: January 2021

Abstract
The article presents the experience of geography teachers’ training at the Pedagogical Institute of Irkutsk State University. We considered the fields of concern and activities that contribute to the effective formation of methodological and professional skills. It was revealed that the diverse extracurricular activities in geography, carried out in the interaction of the pedagogical university with public organizations, municipal information and methodological center and schools, is effective for the development of creative abilities of future teachers. The engagement of students in the created information and education space directly affects the result of the educational process, develops the ability to solve professional issues. Practical knowledge in the development and implementation of joint cultural and educational activities to popularize geography allows students to apply their experience and skills. Hands-on experience with advanced teachers of geography of the city and region, participation in scientific and practical conferences and methodological seminars makes it possible to form a stable motivation of graduates to pursue a master‘s degree and improve their professional qualifications. This practice allows mastering and using basic scientific and theoretical knowledge and practical skills in professional activities, is one of the mechanisms for managing education quality in training competitive specialists.