bluuebunny/crossref_metadata_2025_split huggingface dataset:
Importance of resistivity on edge-localized mode onset in spherical tokamaks
Authors: Kleiner A. , Ferraro N.M. , Diallo A. , Canal G.P. 
Published: March 2021

Abstract
We explore the impact of realistic plasma resistivity on the linear stability of peeling-ballooning (PB) modes in tokamak discharges with low-aspect ratio. For this study we consider discharges that are subject to edge-localized modes (ELMs) in the National Spherical Torus Experiment (NSTX). Employing the state of the art extended-magnetohydrodynamic (MHD) code M3D-C1 it is demonstrated that non-ideal effects can significantly affect PB stability thresholds in NSTX discharges. In particular, robust resistive PB modes are found to exist well before the ideal PB stability threshold is met. These novel results can explain why ideal-MHD theory often does not accurately describe ELM onset in spherical torus configurations, and also present a valuable basis for the development of a predictive model for ELMs in low-aspect ratio tokamaks.
Comparison of divertor behavior and plasma confinement between argon and neon seeding in EAST
Authors: Li Kedong , Yang Zhongshi , Wang Huiqian , Xu Guosheng , Yuan Qiping , Guo Houyang , Eldon David , Hyatt Alan , Humphreys David , Chen Meiwen , Wu Kai , Liu Jianbin , He Tao , Yang Qingquan , Lin Xin , Xu Jichan , Meng Lingyi , Ding Fang , Chen Xiahua , Luo Yu , Wu Jinhua , Duan Yanmin , Luo Guang-Nan , Wang Liang 
Published: March 2021

Abstract
The exhaust of excessively high heat and particle fluxes on the divertor target is crucial for EAST long-pulse operation. In the recent EAST experiments, stable partial energy detachment around the upper outer strike point with H
98,y2 ∼ 1 was achieved with either Ne or Ar seeding from the upper outer divetor target in the upper single null configuration with ITER-like tungsten divertor. With either Ar or Ne seeding, the electron temperature around the upper outer strike point (T
et,UOSP) was maintained at around 5 eV, the peak temperature of divertor target surface around the upper outer strike point (T
div,UO) decreased significantly, and material sputtering was well suppressed. It was observed that there was less Ar seeding needed for partial energy detachment onset than Ne seeding, which shows that Ar is more efficient in the cooling of T
et on the upper outer divertor than Ne. However, there was no detachment on the upper inner divertor with T
et around strike point (T
et,UISP) remaining >10 eV with either Ar or Ne seeding from the upper outer divertor. Accompanied with the disappearance of double peak phenomenon of ion flux density on the upper inner divertor target (j
s,UI), the peak T
div,UI around the strike point increased to around 300 °C. Although the heat flux on the upper inner divertor target (q
t,UI) is still in the acceptable level, either Ar or Ne seeding only from the upper outer divertor target is not enough to protect the upper inner divertor target from sputtering under current EAST conditions. On the other hand, Ar seeding always causes confinement degradation in the partial energy detachment state. It was observed that there is a slight confinement improvement (∼10%) with Ne seeding, which may be due to density peaking, dilution effects and stabilization of the ion temperature gradient mode.
Experiment data-driven modeling of tokamak discharge in EAST
Authors: Wan Chenguang , Yu Zhi , Wang Feng , Liu Xiaojuan , Li Jiangang 
Published: March 2021

AbstractA neural network model of tokamak discharge is developed based on the experimental dataset of a superconducting long-pulse tokamak (EAST) campaign 2016–2018. The purpose is to reproduce the response of diagnostic signals to actuator signals without introducing additional physical models. In the present work, the discharge curves of electron densityne, stored energyWmhd, and loop voltageVloopwere reproduced from a series of actuator signals. ForneandWmhd, the average similarity between the modeling results and the experimental data achieve 89% and 97%, respectively. The promising results demonstrate that the data-driven methodology provides an alternative to the physical-driven methodology for tokamak discharge modeling. The method presented in the manuscript has the potential of being used for validating the tokamak’s experimental proposals, which could advance and optimize experimental planning and validation.
Views and practices of mathematical method for physics lecture at pre-service physics teachers
Authors: Sujito  , Pratiwi H Y , Soewono E , Suhandi A , Liliasari S 
Published: March 2021

Abstract
The aim of study is to investigate the lecture process of Mathematical Method for Physics. The model is to develop the concept and ability of mathematical logical thinking of students of Physics Education Study Program. Mathematical Method for Physics is used to study physics related to how to systematically find out about nature. The research subjects consisted of 2 lecturers, and students who had taken Mathematical Method for Physics Courses, namely levels 3 and 4. The number of students filling out questionnaires was 94 students. Observations were conducted in class. Observations are focused on the learning process in the class. Data was collected using questionnaires to get student responses to the implementation of lectures. The results of the study were as many as 57.82% of students gave positive statements about the implementation of lectures, while the rest gave negative statements. This shows that studying physics is not only mastery of a collection of knowledge in the form of facts, concepts, or principles, but also an inquiry process. Therefore, the challenge in facing the 21st century is to improve the quality of education. Learning innovation is adjusted to the demands of educational change in the era of industrial revolution 4.0 (millennial). Learning must utilize information, communication, and technology (ICT). Innovation requires the support of a learning process that can strengthen creativity through critical thinking skills.
Design and validation smart teaching materials oriented multiple intelligences on global warming (STM2I-GLOW): Rasch model analysis
Authors: Rosa I S , Liliawati W , Efendi R 
Published: March 2021

Abstract
STM2I-GLOW is a web-based teaching material that is oriented to multiple intelligences in one of the physical materials, namely global warming. This study discusses web-based teaching materials that provide opportunities for students to study wherever students are. In addition, STM2I-GLOW can help students to improve their intelligence so that concepts of global warming can be used through the type of intelligence students have. This article presents the results of the STM2I-GLOW design and validation. A combination of quantitative and qualitative research methods is used in research. The design of the mixed method was chosen for the STM2I-GLOW implementation process in research at one school in Bandung. The instrument used was the STM2I-GLOW validation sheet. The assessor agreed five experts to assess three aspects, namely the media aspect, material aspects and conversation aspects. Validation test using the output menu 10. Items (columns): to order in the MINISTEP software for analysis with Rasch. The results obtained are in two categories in every aspect of the media, material aspects, and aspects that are approved in the category of accepted and rejected compilation of MNSQ clothing values that are installed in the MINISTEP free tool when analyzed using Rasch. The conclusion is that STM2I-GLOW is expected to be used in learning and makes it easy for students to discuss global material according to the type of intelligence of each student.
Evaluation of science process skills of high school students in Tapaktuan City on static fluid material
Authors: Harja M , Sinaga P 
Published: March 2021

Abstract
This descriptive qualitative research aims to evaluate the profile of students’ physics process skills. This research was conducted at a secondary school in the city of Tapaktuan. The population in this study were all students of class X MIPA SMA in Tapaktuan. The sample in this study was grade X MIPA 3 students who tested 20 people. Data collection techniques were used in this study through a multiple choice test instrument. Profile of high school students ‘science process skills in Tapaktuan City, it can be concluded that: the average high school students’ science process skills in Tapaktuan City are low (less), 0% are in the high category, 25% are in the medium category, and 75% are in the low category. The achievement of each aspect of skill varies. In the aspect of observation, classification and interpretation of good categories, aspects of prediction, hypothesis, selection of variables, conducting experiments and communicating are in the sufficient category, while in aspects of asking questions, planning experiments and applying concepts are in the lacking category. The science process skills of high school physics students in Tapaktuan for each aspect of science process skills are still low, with an average percentage of 48.9%.
Identification of critical thinking: suku (supik and kulub) on electricity material in Jambi Province
Authors: Hendriyani D , Siahaan P , Samsudin A 
Published: March 2021

Abstract
The world of education is in line with advances of science and technology, the facilities obtained by students and the ability to teach teachers in training students to think critically are factors that influence differences in the level of critical thinking students. The purpose of this study was to determine the differences between supik and kulub critical thinking skills. The type of this research was a survey study that illustrated how differences in students’ critical thinking skills in a region of Jambi province. The participants consisted of 6 female students, commonly called “SUPIK” and 4 male students, who were usually called “KULUB”. The average student involved comes from the Malay ethnic group, the native Malay ethnic group from Jambi Province. The research instrument used was a test of critical thinking skills. The results of this survey research showed the differences in the ability of supik and kulub critical thinking skills in one region of Jambi Province in learning electricity. This study has limitations because the number of samples used is so small. So, the need for further research by involving more sample and to see in more detail the causes of differences in the critical thinking abilities of supik and kulub.
MATLAB-based physics calculator: alternative for learning media for work and energy concept
Authors: Sumarni R A , Juliardi M , Widiyatun F , Astuti I A D , Okyranida I Y , Bhakti Y B 
Published: March 2021

Abstract
Physics concept makes students less understanding of differential equations of the concept of business and energy. Learning about basic physics about effort and energy can be done with the MATLAB program in the form of a physics calculator by simulating physics formulas. This research uses development research methods (R&D) with 4D development model (Define, Design, Development, and Dissemination). Matlab-based physics calculator are created using Matlab software through a multimedia development format that formula, simulation and theory. The test of the product response was applied on 29 the students. The response items were measured using the Likert scale from 1 to 4 scales. The analysis technique was descriptive statistics. For media expert validation assessment is 3.43 and for material expert validation is 3.64. Overall the result of student response analysis indicates that this physics calculator is good (3.21 out of 4) for use in learning. Basic physics learning with the help of an MATLAB-based physics calculator can help students understand their coursework in a simulated form.
The application of the Rasch Model to evaluate MET for the mastery of microscope concept
Authors: Barus C S A , Siahaan P , Suhendi E 
Published: March 2021

Abstract
Mastery of concepts was essential for further floating into higher thought processes. This research aims to determine the level of mastery microscope concept in high school students by using the MET (Microscope Essay Test). Mastery of concepts was described through cognitive processes described from indicators of competency achievement. The instrument was developed in the test items and non-tests with a validity of 0.66, which was applied to 24 students consisting of 14 girls and 10 boys in one of Bandung’s private schools. Data were analyzed using the Rasch model with the Winstep software. The results of this study show that the ability to explain and illustrate the function of the Microscope is very high, but aspects of determining the magnification of C4, the length of the C5 Microscope, and the design of the Microscope included in the category are very low. Mastery of Microscope Concepts with MET (Microscope Essay Test) analysis, based on the Rasch model, can be recommended to Educators to use learning models that can improve students’ mastery of concepts.
Design and validation of six-tier astronomy diagnostic test instruments with Rasch Model analysis
Authors: Utari G P , Liliawati W , Utama J A 
Published: March 2021

Abstract
Misconceptions occur because students answer problems with explanations that are not in accordance with scientific concepts and are confident in their choice of answers. Identification of misconceptions is an important first step to uncover understanding of learning. The six-tier test was developed from a four-tier test by adding two questionnaire sources of choice of answers to see how the causes of misconception. This study aims to design and validate misconception diagnostic test instruments on Astronomy material. The research method uses mixed methods with the instruments used namely the six tier Astronomy diagnostic test sheet for aspects of reveal, answer, synchronize, relationship, clear, EYD and corresponding. Appraisers numbered four experts to assess the construct and contents of the test instruments. The validation test uses multi-rater test analysis on MINIFAC and MINISTEP software to be analyzed with Rasch. The results obtained from the six-tier Astronomy diagnostic test validation analysis are the suitability of the items fulfilling the appropriate category. Item validity assessment items obtained that the questions can be accepted in all aspects. The conclusion is that the six tier Astronomy diagnostic test instrument is appropriate for identify misconceptions on Astronomy.
The development of 5E-POW (predict-observe-write) learning model assisted by virtual simulation to reduce the quantity of high school students’ misconceptions on fluid topics
Authors: Saputra O , Setiawan A , Rusdiana D , Muslim  , Izzuddin M A 
Published: March 2021

Abstract
This study was aimed by the number of students who were experiencing misconception on the Fluid Topic. Therefore, it requires a learning method that is able to facilitate students to learn which is Marked by a student misconception into a scientific misconception. the purpose of this study is to develop an existing learning models to reduce the quantity of students’ misconception. this research includes mixed methods research with embedded experimental model approach that combine qualitative and quantitative research procedures in one study to solve the problem. the priority of the model is quantitative, with qualitative data attached to methodology. A number of research subjects in the readability test of student worksheets (LKPD) were 5 (five) students in one high school in West Bandung Regency. the research subjects for the trail treatments and devices were 25 students in one high school in Central Sulawesi. the implementation of research subjects consisted of 25 students in one of high schools in Central Sulawesi province. the instruments used for this study were Four-Tier Diagnostic Test and Questionnaire to determine students’ response about the program being developed. The developed learning model has syntactic: engage, explore (predict-observe-write), explain, elaborate and evaluate (5E-POW). It can be declared that based on the data analysis of the average value N-gain on conception acquired by 77.05% and the decrease on the average quantity by -47.45% the conclusion derived from the data obtained is that research has also successfully developed a 5e-pow model with virtual simulations to decrease the quantity of high school student misconception on the Fluid Topic.
Systematic review of physic laboratory skills assessment instruments based on PhysPort with Nvivo
Authors: Efendi R 
Published: March 2021

Abstract
To help educators and researchers related to the availability of standardized physics laboratory skills assessment instruments, so this article is here to present systematically review various physical laboratory skills assessment instruments to provide information and their needs for various forms of physics laboratory skills assessment instruments. This study was conducted with a systematic review method, through identification, evaluation and interpretation of Physics-based database laboratory physics assessment instruments using Nvivo version 12 plus. A systematic review was carried out on the themes informed by PhysPort, including the instrument’s name, developer, purpose, format, duration, focus and level of instrument’s use. The results of systematic reviews report the results of synthesis, so that similarities and between instruments are found. The review results show that there are similarities and differences in aspects of the purposes, format, duration, focus and level of use.
Transposition of a sphere’s volume based on didactic phenomena
Authors: Puspita E , Turmudi  , Rosjanuardi R 
Published: March 2021

Abstract
Concerns about mathematics learning are rarely associated with life contexts, giving ideas to teachers and researchers developing didactic phenomenon-based learning. Didactic phenomenology is defined as a bridge to study mathematical concepts. Unfortunately, the use of didactic phenomena still leaves problems when formalizing the idea, including the concept of spherical volume. The qualitative method was chosen with a didactic phenomenological design, to explore the transposition of spherical volume construction, to strengthen the results of didactic phenomena based learning. By utilizing didactic phenomena and assuming students know the surface area of the sphere informally, the spherical volume can show. Formally with the concept of the volume of a rotating object and double integrals can be proven the volume of the sphere. With the idea of vector and limit the surface area and volume of the sphere can be determined as students know it. Further studies need to do regarding research collaboration mechanisms that involve teachers and academics so that the efforts of teachers in utilizing various didactic phenomena have a foundation of thinking that can be scientifically justified.
The effectiveness of blended learning on students’ critical thinking skills in mathematics education: a literature review
Authors: Sukma Y , Priatna N 
Published: March 2021

Abstract
Critical thinking skills (CTS) is one of the required competencies in the 21st century. Using technology in this era is a common thing including in education. One of the learning methods assisted by technology is blended learning. In this study, the effectiveness of blended learning on students’ CTS will be analyzed. The method used in this study was a literature review. There were view steps to investigate the effectiveness of blended learning on students’ CTS namely providing the definition of blended learning, finding information about essential elements in blended learning, then synthesizing some previous studies on the implementation of the method to improve students’ CTS and connecting the studies with blended learning. Based on the literature review result, the implementation of blended learning in Mathematics had the potential to improve students’ CTS. This study could provide an overview of the problems and opportunities to implement blended learning in schools.
Identification of math teacher’s capabilities in classroom action research
Authors: Palobo M , Tembang Y , Pagiling S L , Nur’aini K D 
Published: March 2021

Abstract
Classroom action research (CAR) is very important to be carried out by a teacher. However, it was found that very few teachers conducted classroom action research. This research is quantitative descriptive. The research aims to identify the teacher’s initial ability to carry out the practice of classroom action research. The research subjects were math teachers of the Merauke consisting of 60 teachers. Data collection techniques using interview, questionnaire and observation methods. Analysis of research data with data reduction methods, data presentation and conclusion drawing. The results showed that 73% of teachers had never carried out CAR, 27% had implemented CAR. Most teachers, 85% said that CAR is very important and must be carried out by every teacher. There are still very high teachers who find it difficult to implement CAR, which is 81.7% with average difficulties for the CAR title component (30%) and Library (23.3%). The main need that is urgently needed immediately is mentoring CAR theory understanding (41.7%), proposal preparation assistance (36.7%) and CAR practice assistance (20%). The training model desired by the teacher is a workshop (40.1%) and practicum (31.8%).
Students’ errors in solving the connection cluster problem: a case study on space and shape content
Authors: Fitri K A , Jupri Al 
Published: March 2021

Abstract
The ability of Indonesia student is still low in solving space and shape problem. It shows that the student gets the difficulties in solving the connection cluster of Programme for International Student Assessment (PISA) particularly in space and shape content. In this study, we carried out a small-case study on analysing student error in solving space and shape problem in connection cluster problem using Newman’s Error Procedure (NEP). We conducted this study for 53 students from two schools. There were three steps in carrying out this study; selecting PISA problem, answering the problem, and interview. Three problems were selected and translated to Indonesia. The students answered the problems for 15 minutes. Then the interview was conducted to clarify the student answer related to the error. It was done only for 4 students who got the difficulties and error in solving the problem. In this research, we found that most of student error was occurred in comprehension and transformation process. Therefore, only a few of students did error for process skill and encode the problem. For future study, we suggest to continue the research about the student conceptual understanding in mathematics.
Student spatial visual in geometry: the case of gender differences
Authors: Yurmalia D , Hasanah A 
Published: March 2021

Abstract
Spatial Visual, a mental representation in depicting visual information, is one of important ability in solving geometry problems. This study aimed to investigate student spatial visual ability and analyze it by gender. A total of participant involved in this research was 30 junior high school students at grade seven. There were three steps in this research. First, we chose two reflection questions from spatial visual assessment by Ramful, Lowrie, and Logan. Next, we interviewed some of students by semi structure interviewed. Finally, we analyzed student spatial visual comparing to types of visualization by Hegarty and Kozhevnicov and analyzed by gender. We found that generally the students had a lack in spatial visual ability because their pictorial representation, however boys had better spatial visual ability than girls.