bluuebunny/crossref_metadata_2025_split huggingface dataset:
Identification of student’s misconceptions in chemical bonding topic using four-tier diagnostic test
Authors: Mahmudah A , Nahadi  , Firman H 
Published: May 2020

Abstract
The purpose of this study was to identify misconceptions by measuring the level of students understanding in chemical bonding topic using four-tier multiple choice diagnostic test. The research method was descriptive and involved 77 students of senior high school in South Tangerang. The results shows that the overall the students misconception on chemical bonding topic was in low category (15.14%). The level of confidence in this study was highly significant because it can provide information about student’s conceptual understanding. Students encountered the most misconceptions when determining bonds in microscopic scale. As an evidence, misconceptions in the concept of determining microscopic ionic and covalent bonds results to medium category (41.56%), and metal bonds with medium category (37.66%). This student’s misconception was due to the limited conceptual knowledge and low visual-spatial abilities.
Revealing students’ problems in learning synthesis organic
Authors: Amsad L N , Liliasari S , Kadarohman A , Sardjono R E 
Published: May 2020

Abstract
Students always show problems when learning about synthesis organic. Therefore, this study aims to reveal all students’ problems in synthesis organic chemistry. The participants of this research were 16 students of chemistry education in one of state university in Papua, Indonesia. This research was a descriptive research of which the students are given learning that concern to the concepts of the synthesis of organic compounds. The result shows that the students’ highest problem was in the concepts of stereochemistry product of organic compound, while the lowest one was in the concepts of the groups’functionality. Based on this study, the lecturer have to give a clearly explanations about the concepts of reagent, required condition, and related stereochemistry product.
Identification of senior high school students’ preconception on artificial muscle context in chemistry learning
Authors: Wijaya K , Hernani  , Yuliani G 
Published: May 2020

Abstract
This research aims to identify students’ pre-conceptions on artificial muscles context as a basis for developing a didactic design in artificial muscle learning, related to chemical contents studied in secondary school. This study employed a descriptive method that was presented quantitatively and qualitatively. The instrument used in this study was a test in the form of essay questions consisted of 7 discourses about artificial muscles. The participants of this study were 25 students from a secondary school in Bandung, West Java. The results of data analysis indicated that 76% of students fell in the category of “low understanding”. The analysis of students’ preconception was used and implemented in the development of a didactic design aiming at connecting artificial muscle context with the application of science and technology in chemistry learning at secondary schools.
Conception, threshold concepts and troublesome knowledge in chemical reactions topic
Authors: Ulfa A M , Wiji W , Mulyani S 
Published: May 2020

Abstract
This study aims to analyze the conception, threshold concept, and troublesome knowledge in chemical reaction topic. This study uses qualitative methods, document analyses, as well as interviews with chemistry teachers to obtain information about threshold concepts and troublesome knowledge. From the results of the analysis of several journals obtained that there were still many misconceptions encountered when students study chemical reactions. While the results of the interview, threshol concept in chemical reaction consisted of mixtures, physical and chemical properties, material changes, concepts of protons and electrons, electron configurations, chemical bonds, intermolecular forces, attractive forces between charges, compound nomenclatures, chemical formulas, and Lavoisier’s laws. While troublesome knowledge includes complexity of particles involved, complexity of interactions that may occur, complexity of applying Lavoisier’s Law, and language used.
The conception of pre-service chemistry teachers on chemistry contents in the context of conductive glass
Authors: Annisa D A , Hernani  , Khoerunnisa F 
Published: May 2020

Abstract
The purpose of this study is to obtain the conception of pre-service chemistry teachers related to chemical contents in the context of conductive glass investigated through didactic design. Descriptive research method was chosen as the method in this study and the analysis was carried out quantitatively and qualitatively with 27 participants of the fourth semester at one of the universities in Bandar Lampung. The instrument used were 11 essay questions covered in 7 different discourses. The obtained results will be used as preference to make didactical design in the context of conductive glass. Based on student answers, it is known that 70.4% still have a low understanding on resistivity and semiconductor concepts. The low level of understanding shows that there are still many students who do not understand the chemical contents as basic knowledge for making didactic design to teach chemical contents in the context of conductive glass.
Students empowerment in chemistry learning through the integration of dilemma teaching pedagogy in plastic waste
Authors: Rahmawati Y , Agustin M A , Sihombing S N , Mardiah A , Iriyadi D 
Published: May 2020

Abstract
The research aimed to engage students in reflecting their values through the integration of dilemma teaching pedagogy in chemistry classroom. Dilemmas stories have been engaged students in values awareness through critical and dilemma thinking in the issues of plastic waste. The research was conducted in four secondary schools in Indonesia with 457 students, with depth case study in two classrooms of year 12. The mixed-method study as a methodology provided different perspectives to understand the participants. The survey as quantitative data collection used The Constructivist Values Learning Environment Survey (CVLES), followed by qualitative data through semi-structured interviews, and classroom observations. The CVLES obtained perceptions of student engagement with the story, the teacher’s supportive role, critical thinking skill development, and students’ learning to listen actively and think about the chemistry learning. The results show that the students and the researcher engaged in critical reflection on their values, collaboration with others, on their roles in participating in environmental education, social issues, and in deep chemistry learning. In addition, the dilemmas stories play important roles in developing character education which is relevant to new Indonesia curricula.
Electrochemical learning with a modified writing to teach (WtT) approach to improve the students’ concept mastery
Authors: Nurdiyanti D , Permanasari A , Mulyani S , Hernani  
Published: May 2020

Abstract
Concept mastery is considered as a requirement that must be possessed by chemistry teacher candidates to teach the students about chemical concepts. The aim of this study is to improve the students’ concept mastery in electrochemistry through school chemistry subject by conducting a modified WtT approach. The study involves twenty students in the fifth semester who commit the subject of school chemistry. The data are obtained through test of concept mastery to obtain information about the concept of mastery of before and after learning. Then, the data are carried out from interview to obtain information about the students’ responses in related to the implementation of WtT approach in the learning process. The data analysis is accomplished through the N-Gain test to discover the improvement of the implementation of concept mastery and effect size test for paired t-test to determine its effectiveness. Meanwhile, the results of interview are utilized to strengthen the data of concept mastery. The results of the present study reveal that there is an average improvement of the students’ concept mastery. Furthermore, the result of effect size test shows that the WtT approach is considered to be effective to improve the students’ concept mastery in the average level.
Profile of prospective primary school teachers’ mental model in the subject matter of change
Authors: Hermita N , Alpusari M , Noviana E , Kurniaman O , Islami N 
Published: May 2020

Abstract
This study aimed to obtain an overview of the profile of the mental model (MM) of prospective primary school teachers in the concepts of change in the state of matter. The mental model (MM) categories reviewed in this study includes scientific MM, synthetic MM, and initial MM. A descriptive quantitative method was selected in this study. Among 30 of prospective primary school teachers at one university in Riau Province who had attended the science course were involved in this study. Lectures on the essential concept of science are carried out by lecturers using traditional (teacher centered). A test was used to collect the information of conceptual understanding, which is consisting of three question fragments (explanatory and depictions responses). The results demonstrated that the mental model profile of primary school teachers on phase transition (melting phenomena) are: scientific MM (0%), synthetic MM (27%) andiInitial MM (73%); related to the concept of freezing are: Scientific MM (0%), Synthetic MM (20%), and Initial MM (80%); related to the concept of evaporate are: Scientific MM (0%), Synthetic MM (23%) and Initial MM (77%); and related to the concepts of condense are: Scientific MM (0%), Synthetic MM (17%) and initial MM (83%). These results indicated that lectures on the basic concept of science carried out by lecturers had not facilitated the achievement of a scientific mental model for prospective primary school teachers.
Profile of the ability of teachers in planning and carrying out 4C skills-oriented science teaching
Authors: Setiawati I , Rusman  , Djohar A 
Published: May 2020

Abstract
The aim of this research is to get the depiction of the ability of science teachers in planning and carrying out 4C (critical, creative, collaborative and communication) skills-oriented science teaching. The research method used is quantitative descriptive. The subjects of the research were 12 science teachers (7 female and 5 male) from several junior high schools in West Bandung district of West Java province. The instrument used for data collection is the teaching plan assessment rubric and the assessment rubric of real teaching that was adapted from the assessment rubric used for the performance test of the teacher profession program. Data analysis was carried out by reviewing; gender, teaching experience and teacher education background. The results showed that: 1) most of science teachers who were the subjects of the research had low ability to plan and implement of 4C skills-oriented science teaching, 2) there was no gender bias, no teaching experience bias and no teacher’s educational background bias in the ability to planing and carrying out of 4C-oriented science teaching. The low ability of the science teachers indicates the need to increase teacher competency through relevant training programs.
Student’s research skills in middle school of Kuningan district
Authors: Nurlaelah I , Widodo A , Redjeki S , Rahman T 
Published: May 2020

Abstract
This exploratory study aimed to analyze the research skills and to explore the authentic research abilities that can support students’ research skills. The study engaged sixty-eight students of science class from two schools in Kuningan district. The data was collected through research skills tests, consist of 11 items of essay questions including seven components of research skills: 1) Understanding phenomena and identifying problems, 2) formulating problems, 3) composing hypotheses, 4) making research designs, 5) implementing experiments and collecting data, 6) analysing data, and 7) making conclusions. The results revealed that the authentic research abilities of students based on, the seven components of research skills were very lacking. The average score of the rubric was 1, it meant that the students were less skilled. The largest percentage of the average test score in both of schools showed that they were in very less category, 72% (first school) and 79% (second school). The analysis on seven components of student research skills was still in the range of the score 0-1.
Pedagogical content knowledge (PCK) of science teachers based on content representation (CoRe)
Authors: Yanti Meili , Riandi  , Suhandi A 
Published: May 2020

Abstract
Pedagogical Content Knowledge (PCK) has been one of the chief frameworks that widely employed by educators and researchers in order to examine and develop teachers knowledge of integrating content into the right pedagogy. In this article authors purposes to describe PCK of science teachers using an instrument developed by John Loughran, well known as Content Representation (CoRe). A core is constructed by asking teachers to identify “the big ideas” associated with teaching a topic to students. Participants were science teachers from a secondary school and have different ages from 21 until 34 years old. They were completed Content Representation to gain the data about their ability in PCK. Our results reveal that the teachers have different knowledge of PCK. Teachers knowledge of their PCK is related to working experience and professional development.
Environmental literacy profile of 7th grade junior high school students in science learning on global warming subject
Authors: Maulaa I , Hamidah I , Permanasari A 
Published: May 2020

Abstract
This paper examined environmental literacy which has become a global issue in the world. This study aimed at analysing the environmental literacy profile of junior high school students in one of junior high schools in Bandung, West Java Indonesia. The method used was pre-experimental method employing scientific descriptions that were explored descriptively. The population and sample were 96 students in the 7th-grade of junior high school. Environmental literacy was measured by 30 multiple choice questions covering aspects of knowledge, environmental affective, cognitive skills, and behaviour. An environmental literacy test was developed adopting the Middle Schools Environmental Survey/Instrument (MSELS/I) test questions used by NELA. The results indicated that the environmental literacy of the students was classified as the medium category. The scores obtained by students for each aspect were not significantly different. Knowledge aspects, affective environment, cognitive skills, and behaviour score of 53.28, 47,52, 56.64 and 49.17, respectively. Based on the achievement level of each group of students, environmental literacy obtained for the high, medium and low categories were 11%, 57%, and 32%, respectively. Based on these results, it can be concluded that teacher efforts to make learning better, more innovative, and oriented towards environmental literacy were highly required.
Study on the higher-order structure and hydrogen bonding of biodegradable polymer by low-frequency vibrational spectroscopy
Authors: Marlina Dian , Sato Harumi 
Published: May 2020

Abstract
Biodegradable polymer is preferred material to replace the conventional petroleum based polymer materials to protect the nature and conserve oil supplies. Information related to higher-order structure and hydrogen bonding among polymers can be observed in the low-frequency region (3.3-333 cm−1) using terahertz (THz) spectroscopy. THz spectra measurement of temperature-dependent investigation of poly(3-hydroxybutyrate) (PHB) homopolymer and polymer blend of PHB/glycol chitosan with the blend ratios of (80/20) and (60/40) have been performed to investigate the change in higher-order structure and intermolecular hydrogen bonding formed by polymer blends of PHB and glycol chitosan. The THz spectra revealed that the peak at 82 cm−1 does not collapse even in the high temperature indicating the important role of hydrogen bonding interaction between poly(3-hydroxybutyrate) (PHB) and glycol chitosan in maintaining the higher-order structure of the PHB in its blending system.
Prediction of 4f2−4f15d1 transition energy of Pr3+ in fluorides based on first-principles calculations and machine learning
Authors: Obata Hayato , Takemura Shota , Ogasawara Kazuyoshi 
Published: May 2020

Abstract
The 4f2−4f15d1 transition energy of Pr3+ in fluorides are utilized for various optical materials such as solid-state lasers, phosphors, and scintillators. Therefore, it is important to predict such energies of unknown materials for theoretical design of novel optical materials. In this study, we tried to predict the 4f2−4f15d1 transition energies of Pr3+ in fluorides based on first-principles calculations and machine learning. The first-principles calculations were performed based on the relativistic discrete variational multi-electron (DVME) method using the model clusters composed of the central Pr3+ and the anions closer than the nearest cation. Although the calculated 4f2−4f15d1 transition energies of Pr3+ in fluorides showed a relatively good correlation with the experimental ones, the calculated values tend to be overestimated by ca. 2 eV. In order to improve the accuracy of the prediction, we used the calculated transition energies as an attribute for machine learning. As a result, the regression formula to predict the 4f2−4f15d1 transition energy of Pr3+ in fluorides has been derived by machine learning using the calculated 4f2−4f15d1 transition energy as well as some other electronic and structural parameters as the attributes. The accuracy of the prediction was significantly improved compared to the simple first-principles calculations.
Recent applications of discrete variational multi-electron method
Authors: Ogasawara Kazuyoshi 
Published: May 2020

Abstract
The discrete variational multi-electron (DVME) method is a first-principles many-electron calculation method based on the discrete-variational Xα (DV-Xα) molecular orbital method. There is also the relativistic version of the DVME method, which is based on the relativistic DV-Xα method. Since the explicit many-electron wave functions of the multiplet states of transition-metal (TM) or rare-earth (RE) ions in crystals can be obtained, the DVME method has been applied to the analyses of various luminescent materials such as solid-state lasers and phosphors. In this paper, as examples of the recent applications of the DVME method, the following researches will be briefly presented: (1) Visualization of the energy-structure relationship of Cr3+ in oxides, and (2) Creation of the predictive model of the multiplet energy using machine learning.
Bioplastic from Jackfruit Seeds and Rice
Authors: Lestari Retno A.S. , Kasmiyatun Mega , Dermawan Kevin , Aini Alfia N. , Riyati Nur , Putri Finka R. 
Published: May 2020

Abstract
This study tried to explore characterization of biodegradable plastic from jackfruit seeds and rice waste. Jackfruit seeds and rice waste contain starch, so it can be used for plastic material with addition of several additives such as polyvinyl alcohol (PVA), glycerol, chitosan and sorbitol. Starch is one of polysaccharides that be used as raw material for biofilms. Polyvinyl alcohol is the most important plastic in making water-soluble films. It was ability to form films, emulsifiers, and its adhesive properties. Polyvinyl alcohol has high tensile strength, good flexibility, and good oxygen barrier. Sorbitol and glycerol are also an additive in the manufacture of biodegradable plastics from starch, which is a plasticizer that increase elasticity. Chitosan have effects to bioplastic, such as biodegradable, hydrophilicity, and anti bacterial. This research aims to determine the effect of addition of PVA, glycerol, chitosan and sorbitol to optimum characteristics of bioplastic. The parameters to be examined bioplastic include thickness, moisture content, tensile strength, and % elongation. Increasing of glycerol added to the plastic material effect to decrease of tensile strength of bioplastic and elongation, lower water resistance and more easily degraded. Increasing of chitosan added to the plastic material effect to higher tensile strength, lower elongation, higher resistance to water and lower degradation. Increasing of PVA added to the plastic material effect to increasing of the tensile strength of the bioplastic and decreasing of elongation of bioplastic, but the increasing of sorbitol effect to decreasing of tensile strength and increasing of elongation of bioplastic.
Detecting Hoaxes in Indonesian News Using TF/TDM and K Nearest Neighbor
Authors: Zuliarso Eri , Anwar Muchamad Taufiq , Hadiono Kristophorus , Chasanah Iswatun 
Published: May 2020

Abstract
The presence of the internet and the rapid growth of social media had given rise to the blossoming of hoax creation and distribution through it. A hoax can cause anxiety and reactivity to its readers and could harm a certain party. Thereby, it is important to detect and report hoaxes to stop its spreading as soon as possible. This research aims to utilize the K Nearest Neighbor (KNN) classification algorithm to detect whether a piece of news is a hoax or not. Experiments were done by using 74 hoaxes compiled from Indonesian hoax-debunking community websites and were being compared against 74 real news from various reputable news websites in Indonesia. The result showed that the model could give detection/classification accuracy up to 83.6% and that the model is prone to false positives detections. The characteristics of the resulted model and further research directions are then discussed.
Decision Support System Museum Ambassadors Using Topsis Method
Authors: Wibowo Setyoningsih , Tyas Maichifa Ayuning , Nada Noora Qotrun , Novita Mega 
Published: May 2020

Abstract
Generally, museum ambassador is based on various criteria from several assessment stages. The evaluation criteria for the audition stage are: interview, communication, appearance. The assessment criteria for the quarantine stage are: creativity, ability, liveliness, loyalty, responsibility, and written test. The final stage assessment criteria are: ideas, communication, and appearance. In the selection process, the committee used manual method so it was prone to errors. The decision support system used TOPSIS method. SDLC (System Development Life Cycle) was used as a design method. The research showed a score of 100 which means that the system is accepted by users. Meanwhile the user testing to four respondents obtained a percentage of 89.24% which means that the system is worth using. The system was developed in the web. So that is need more research to be developed in mobile.
Designing Android Based Education Game Aksara Jawa Using Shuffle Random Algorithm
Authors: Saputro Nugroho Dwi , Romadhani Triana , Dewanto Febrian Murti 
Published: May 2020

Abstract
The lack of appropriate supporting media in learning at the age of children makes the young generation now less familiar and still having difficulty learning Javanese script (Aksara Jawa called in indonesia). For this reason, we need appropriate media in the introduction of Javanese script, one of which is through interesting educational games and can provide information about Javanese script. Games are forms of application that can be used as learning media where the process can be done with the concept of learning while playing for children. In this study the algorithm used was the Shuffle Random Algorithm. With this randomization algorithm, it is expected to avoid repetition of the problem so that the learning process can run effectively. Furthermore, this application was tested using the Black Box, White Box and User Acceptance Test. With the Black Box and White Box testing get a percentage of 100% while with the User Acceptance Test this application has an average of 86%, so it can be concluded that this educational game is feasible to be used as a learning medium for Javanese script.