bluuebunny/crossref_metadata_2025_split huggingface dataset:
Virtual Reality and Educational Game to Learn Madurese History and Alphabet For Elementary School Students
Authors: Ramansyah Wanda , Aini Nuru , Fitriansyah Wisno , Pratama M Dimas 
Published: March 2021

Abstract
This development research aims to develop a learning media that collaborates virtual reality and educational game to learn Madurese history and alphabet. This learning media was created to facilitate the difficulties of 3rd grade students of Pangarangan III Elementary School of Sumenep in learning Madurese history and alphabet. This learning media is developed based on information technology that can bring students to an environment that seems real. This media also supports distance learning which is suitable for students to use in learning during the current Covid-19 pandemic. The development of this learning media uses ADDIE Model. The learning media that has been created are then tested with results of trials on media design experts is 91% (very high), trials on material or content experts are 84% (high), trials on individual users (three students) are 85% (high), testing trials in small group users (six students) was 87% (high), and trials in large group users (twenty students) was 86% (high). It can be concluded that the virtual reality and educational games are well worth it and no need to revise. The application of this media in learning will have an impact on increasing the effectiveness, efficiency and attractiveness of learning Madura history and alphabet.
Students’ Perceptions of Using Microsoft Teams Application in Online Learning During the Covid-19 Pandemic
Authors: Wea Kristiana Nathalia , Dua Kuki Agustina 
Published: March 2021

Abstract
The spread of COVID-19 has an impact on changing the learning process at the Faculty of Teacher Training and Education (FKIP) Nusa Nipa University (UNIPA). UNIPA chose to implement online learning using Microsoft Teams. This study aims to determine the FKIP students’ perceptions on the use of Microsoft Teams application in online learning during the COVID-19 pandemic. The sample of this research was 176 FKIP students’ which were spread in 5 study programs. They are Physics Education, Chemistry Education, Biology Education, and Elementary School Teacher Education. This research is qualitative research with data collection techniques were questionnaire and analyzed using Likert scale. The results showed that FKIP UNIPA students had a good perception of using Microsoft Teams. Students hope that this application will continue to be used during online learning with some improvements so that learning using this application can take place more effectively and efficiently.
Developing instrument to measure entrepreneur skills of vocational school students based on sustainable development
Authors: Dalyanto A , Sajidan  , Siswandari  , Sukarmin  
Published: March 2021

Abstract
Entrepreneurial activities require a variety of skills. Instruments that measure the entrepreneurial skills of vocational school students are still very limited. This article aims to develop and validate instruments in measuring the entrepreneurial skills of vocational school students based on sustainable development. The research population was vocational school students in Klaten. Stratified cluster random sampling is used for sampling. The research method used is a quantitative method with an explanatory type of study that is directed to analyze and produce an instrument for assessing entrepreneurial skills. The item analysis to determine the criteria of internal consistency used Pearson Product Moment regarding data collected from one hundred and sixty students. The reliability of the instrument was determined using Cronbach’s alpha coefficient. The criteria of internal consistency from each component is relatively high. The lowest average degree is 0.556 in the component view of independence, and the highest average level is 0.605 in the seeing opportunities component. The Cronbach’s alpha coefficient for the reliability test was 0.622 in the learning orientation component as the lowest degree and 0.819 in the result-oriented component as the highest degree. The results revealed that the entrepreneurial skills instrument is a valid and reliable tool for assessing the entrepreneurial skills of vocational school students.
Identification of Multiple Representation Abilities Using C3TMC Instrument: Needs Analysis in Chemistry Learning
Authors: Faradilla P H , Sri Y , Sulistyo S 
Published: March 2021

Abstract
Chemistry learning plays a significant role in producing pupils whom both mastered the cognitive aspect and multiple representative aspects (contextual learning). Evaluation instrument used by the teacher for measuring cognitive aspect is common, but those for measuring multiple representation ability is rare. The proper instrument is needed to measure multiple representations. This study aims to describe the analysis of the needs of the Computerized Three-Tier Multiple choice (C3TMC) Instrument to measure student’s multiple representational abilities in chemistry learning. Qualitative descriptive is the research method chosen by conducting a qualitative survey. The sampling technique was purposive sampling. The participants consisted of 17 chemistry teachers in the Surakarta area. This research used 13 items of the survey that aimed to reveal teachers’ needs on the learning evaluation process had been validated by two experts. The results obtained show that the analysis of computerized and needed an assessment instrument that was able to measure students’ multiple representational abilities has a high utilization category in chemistry learning, namely 88.2%. By considering the results, the teachers tremendously need a good instrument to measure pupils’ multiple representation abilities in Chemistry learning.
Mixture Model Nonparametric Regression and Its Application
Authors: Adrianingsih Narita Yuri , Budiantara I Nyoman , Purnomo Jerry Dwi Trijoyo 
Published: March 2021

Abstract
Regression analysis is a statistical analysis used to determine the pattern of relationships between predictor variables and response variables. There are two models of estimation approaches in regression analysis, namely parametric regression, and nonparametric regression. The parametric regression approach is used in the shape of the regression curve is known. In cases with unknown relationship patterns, the development is done using nonparametric regression. Nonparametric regression is a model estimation method which is based on an approach that is not bound by certain assumptions of the regression curve shape. Nonparametric regression varies greatly with variable curves that are different between one predictor variable with another predictor variable. In nonparametric regression, there are several types of the recommended kernel, spline, and Fourier series. In many cases, however, these conservative nonparametric regression methods cannot handle more complex problems. Mixture methods by combining several methods such as a mixture of spline and Fourier series, kernel and Fourier series, and so on, give a better result. This study aims to obtain estimates of a mixture of a truncated spline, kernel, and Fourier series by using the Ordinary Least Square (OLS) method and obtain methods for selecting knots, bandwidth, and optimal oscillation parameters with the smallest GCV. The results of this study are the formulation of a mixed estimation model of the truncated spline, kernel, and Fourier series and the smallest GCV formula to obtain the optimum location and number of points of knots, bandwidth, and oscillations.
Promoting Scientific Literacy in Chemistry Learning on the Subject Colloid through Instructional Material Development
Authors: Hatta  , Miterianifa  , Octarya Zona 
Published: March 2021

Abstract
Students’ scientific literacy skills are still low because they are still minimal or not the availability of chemistry teaching materials that contain balanced scientific literacy skills. The research objective was to develop scientific literacy-based chemistry teaching materials that contain balanced scientific literacy, validity, readability, and effectiveness. This research conducted research and development methods with the ADDIE approach which consists of five steps; analyze, design, develop, implement, and evaluation. Based on the research results, the teaching materials were based on science literacy colloid material which developed has the characteristics of a balanced scientific literacy content, namely 41,17% of science as the body of knowledge, 17,64% of science as a way of investigating, 17,64% science as a way of thinking, and 23,52% interaction of science, technology, and society. 7 validators of scientific literacy-oriented teaching materials were declared feasible and have criteria easy to understand with average readability of 74.11%. An increase in scientific literacy skills students who use science literacy-based teaching materials is higher than students who using teaching materials used in school.
The Removal of Methylene Blue and Congo Red Dyes from Aqueous Solution by Using Sulfonated Carbon Derived Fishbone
Authors: Nurhadi M. , Kusumawardani R. , Rindoi M. , Apriliani A. D. , Khair A. F. , Noor A. , Lumbantobing T. P. 
Published: March 2021

Abstract
In the world, the dyes pollutant from industrial activity is big issue that must be sought the solution. Among of dyes pollutants were methylene blue (MB) and congo red (CR). In this research have been conducted the removal of methylene blue and congo red onto sulfonated carbon derived fishbone (SCFB) as adsorbent from aqueous solution. The preparation steps of SCFB adsorbent involved the sulfonation (H2SO4; 1M) of fishbone powder for 6 h, by stirrer at room temperature, and followed by carbonization at 500 °C for 2 h. The physical properties of the adsorbents were characterized using Fourier Transform Infrared, X-Ray Diffraction (XRD), and nitrogen adsorption-desorption studies. The dye removal study using SCFB adsorbent was carried out by varying contact time and initial dye concentration. The kinetics models were determined by the effects of contact time. The adsorption isotherms were tested to isotherm Langmuir and Freundlich with a base on the effect of initial dye concentration. The result showed that The removal of MB and CR dyes using SCFB adsorbent fitted a pseudo-second-order kinetic models. The maximum dye removal capacity of SCFB was 128.2 mg g−1 for CR and 35.7 mg g− 1 for MB. Base on the maximum dye removal capacity, the SCFB can be considered as good adsorbent to remove dyes pollutant from environment.
The Generic Science Skill Profile of High School on Theory Momentum And Impulse
Authors: Sakliressy M T , Sunarno W , Nurosyid F 
Published: March 2021

Abstract
So many jobs today require high-level skills, logical thinking, creative thinking, generic and scientific processes, being able to solve problems, and make decisions. These skills are one of the main goals of 21st-century learning. Based on the results of a survey by TIMSS (Third International in Mathematics and Science Study) students in Indonesia in the field of science are ranked 38 out of 40 countries. This study aims to describe the generic science skill profile of YPPK Teruna Bakti high school students class XI on momentum and impulse. The method used in this research is descriptive quantitative. Data were collected through a test method in the form of multiple-choice questions based on three of the nine generic science skills indicators according to Brotosiswoyo. The test was conducted on 35 students. The test results showed that the overall average level of mastery was 55.7%. Generic science skills per indicator, for direct observation indicators 59.5%, concept building indicators 55.7%, logical consistency indicators 51.4%. The overall average for the concept of momentum and impulse is 60%, the concept of momentum-impulse relationship and the law of conservation of momentum is 52%, and the concept of collision and application impulse-momentum is 55%.
Maxwell Klein-Gordon System with General Gauge Coupling on 4-Dimensional Flat Spacetime
Authors: Mulyanto  , Akbar Fiki T , Gunara Bobby E 
Published: March 2021

Abstract
In this paper, we study the Maxwell Klein Gordon system (MKG) with the addition of general gauge couplings on four-dimensional Minkowski space. This system analyzes the interaction of the electromagnetic field (photon) coupled with the complex scalar field (spin-0 particles). This research considers the multi-field interactions by adding general coupling. Our method begins from the Lagrangian of Maxwell Klein Gordon equation with potential turn on. We derive the energy of the system, then write the equation of motion in the form of a non-linear partial differential equation. By using the spherical means method, we express the solutions in an integral form of its curvature. Then, by using temporal gauge condition and conservation of energy, we prove the inequality for some general coupling. The result shows that the first and the second derivative of it bounded by the energy and IL norm. This result will become the main key to proving the global existence of Maxwell Klein-Gordon’s theory.
The Effect of Teacher Candidates’ Science Process Skill on Analytical Chemistry Through Guided Inquiry Learning Model
Authors: Juniar Anna , Silalahi Albinus , Suyanti Retno Dwi 
Published: March 2021

Abstract
This study was purposed to find out is there any significant difference of guided inquiry and conventional learning model implementation towards Analytical Chemistry practicum courses, particularly on Redox, Argentometry and Complexometry titrations. This study also analyzed the effect of the learning model through quasi-experimental method. There were 28 teacher candidates in experimental class which taught by using guided inquiry (GI) learning model and 23 teacher candidates in control class which taught by using conventional learning model. Based on Mann-Whitney test, p-values for Redox, Argentometry and Complexometry practicum courses were 0.001, 0.012, 0.030 respectively. Since p-values were less than 0.05 then Ha is accepted which means teacher candidates’ science process skill in experimental class is different significantly compared to control class. The effect of model was calculated through N-gain which score 81%, 76% and 80% in experimental class and 55%, 57% and 59% in control class for respective practicum. This means the teacher candidates’ science process skill is better in experimental class (taught by using GI model) than control class (taught by using conventional model). These findings give contribution to chemistry education especially for improving chemistry teacher candidates’ quality and reducing them who often feel difficult to learn Analytical Chemistry.
Students’ Creative Thinking Skills of Learning Cell Metabolism Using Stim-Hots Model
Authors: Sukmawati A , Sajidan  , Harlita  
Published: March 2021

Abstract
Creative thinking skills are high-level thinking skills that have a large impact on the progress of students in particular. The importance of creative thinking skills is a major concern for training it to students. This study aims to train students’ creative thinking skills on the material in cell metabolism by using modules based on stimulating higher order thinking skills (Stim-HOTs). This research uses quantitative descriptive methods. The instrument used was a creative thinking test instrument on cell metabolic material that had been integrated with aspects of creative thinking. The research subjects were 64 students of 12th grade high school in Surakarta including 32 control class students and 32 module class students. The results showed that the creative thinking skills of students who were trained using modules based on stimulating higher order thinking skills on metabolic material had increased. It showed in the eksperimen class, namely in the aspects of fluency 70,31, originality 71,48, and flexibility 62,5 are at the high category level.
Meta-Analysis of The Effectiveness of Problem-Based Learning Towards Critical Thinking Skills in Science Learning
Authors: Luvia Ranggi Nastiti , Yokhebed  , Ramli Murni , Yuliani Hadma 
Published: March 2021

Abstract
In 21st century learning, students are required to be able to face the world of work that requires the ability, one of them is critical thinking. The objective of this meta-analysis is to estimate the effectiveness of problem-based learning on critical thinking skills. This meta-analysis research method consists of some steps, they are research problem, data collection (study), data coding, data analysis, and interpretation. Based on the journal research, it is found 17 critical thinking skills journals, 17 articles that fulfill the criteria: an empirical study on problem-based learning in college and secondary education conducted in classrooms. This explanation revealed that there is a strong positive effect of Problem-based Learning on critical thinking skills. The findings of the research revealed that the results of the meta-analysis were obtained an effect size of the influence of Problem-based Learning on the dependent variable of critical thinking skills of 3,1 which is classified as high where the influence of Problem-based Learning on the dependent variable of critical thinking skills is 99.9%.
The 21 st century science learning: HOTS and digital literacy among junior high school students in Semarang, Indonesia
Authors: Widiyawati Yeni , Nurwahidah Indri , Sari Dwi Septiana , Masykuri Mohammad , Budiyanto Cucuk Wawan 
Published: March 2021

Abstract
The 21st-century skills was broadly discussed in all sectors. It challenges education to equip next generation with all important skills to face the digital technology transformation. The focus of this study was to identify profile of student’s higher-order thinking skills (HOTS) and digital literacy among junior high school students in science learning. Mixed method, a combination of quantitative and qualitative was used in this study. A total number of 170 of grade 7th students in private and public junior high school in Semarang City were administered in the integrated science test (IST). IST were used to measure student’s HOTS through constructed-multiple choice test. 17 science teachers were the key informant of HOTS and digital literacy in science learning. Rasch model and descriptive analysis used to identify HOTS and digital literacy based on gender and type of school. The results reveal that : (1) most of junior high school students HOTS performace were at low slight to moderate level (2) female students performs better than male students in HOTS, (3) type of school significantly impact on students’ achievement, and (4) teachers’ operation and thinking skills as basic skill of digital literacy were still unsufficient to provide digital-based learning. However, it is necessary to accustom implementation of HOTS assessment as well as digital technology in the science learning environment.
The Production of Surfactant Anionic Methyl Ester Sulfonate (MES) from Virgin Coconut Oil (VCO) with Ultrasound-Assisted
Authors: Amaliah Devi , Qadariyah Lailatul , Mahfud Mahfud 
Published: March 2021

Abstract
Virgine coconut oil (VCO) is a vegetable oil that has many ingredients that can be used, one of the highest ingredients is lauric acid about 41-51%. It can be used to synthesis of surfactants, which is the surfactant anionic methyl ester sulfonate (MES). However, time of transesterification and sulfonation needed is very long in the conventional process. Because of that, some researchers have proved that ultrasound-assisted can accelerate and increase the yield because ultrasound can directly cavitation that help the rupture mechanism of matrix cells. In the sulfonation process, methyl ester is reacted with sodium bisulfite (NaHSO3) with several predetermined variables. After being reacted, the mixture of methyl ester and NaHSO3 used a separating funnel and then purified using 50% of methanol, then evaporated and neutralized using 20% of NaOH. The measured quantities include yield, density, viscosity, surface tension, FT-IR analysis and Gas Chromatography-Mass Spectrometry (GC-MS) analysis. In transesterification, the optimum conditions were obtained in 1:6 of mole ratio in 3 minutes, the yield of 90%. In sulfonation, the optimum conditions were obtained in temperature at 65°C in 30 minutes. With the resulting viscosity of 4,04 cSt, the yield is 98%, and the surface tension is 32,028 dyne/cm.
Optimization of Magnetic Coil Construction Using Genetic Algorithm Method
Authors: Winarno B , Paracha Z J , Subkhan M F , Kusumo R J , Lestariningsih T , Atmaja A P , Basuki I 
Published: March 2021

Abstract
In this article, we discuss coil construction that has the right combination of the number of layers and the number of turns per layer. This combination produces a large electromagnetic force with a physical form that is not too large. A magnetic coil can be used as an electromagnetic ejection. The modification of coil construction is done by using the genetic algorithm method. Experiments were carried out using a population of 100 chromosomes and encoded in 8 bits. Then the resulting programming results are calibrated using the FEMM application to obtain a magnetic force profile. The simulation is carried out with a coil forming wire using the #AWG 10 standard which has a length of 3 meter. The results showed that the optimal force was achieved with a coil construction that had 27 layers (nL) and each layer had 38 turns (Tpl).
Stemming Analysis Indonesian Language News Text with Porter Algorithm
Authors: Arif siswandi A. , Permana Yudi , Emarilis Arvita 
Published: March 2021

Abstract
Stemming is the process of classifying various morphological variations of a word or sentence into one and the same basic form. In Indonesian language stemming, there are two types of stemming methods that already exist, namely the dictionary-based stemming algorithm and the non-dictionary-based stemming algorithm. In this study the algorithm used is the Indonesian Porter algorithm for dictionary-based ones. The test was carried out using 100 predetermined Indonesian text documents. The results of tests conducted show that the highest accuracy value is found in the Porter algorithm, the least Overstemming and Understemming values are also found in the Porter algorithm.
Inventory Information Systems in Water Companies: A Case of Data Synchronization Issue
Authors: Nugraha Ermar Anjas , Renaldi Faiza , Ashaury Herdi 
Published: March 2021

AbstractInventory is an activity that records every process in the flow of an item starting from importing goods, checking goods, requesting goods, to releasing goods from the warehouse. PT. Perdana Multiguna Sarana Barat Bandung (PMgS) is engaged in services for clean water distribution which include new connection installation services and line repair that have problems in their inventory activities. starting from recording old customer items that do not exist, late recording of return of goods and when the goods needed following the installation or repair sometimes lacking this has an impact on the working time of repairing lines and installation of new connections is slightly hampered due to lack of rapid control of information about inventory data. For that reason, in supporting and improving company performance, inventory information system information is needed that can provide information easily, quickly, and integrated to all parts related to inventory. In building this inventory information system the system development method used is a waterfall and the output of this system is a system that can record the return of goods, control of the stock of goods taken directly can be known and data in and out of goods more controlled so that reporting of goods is easier and quicker. Our acceptance test showed that all the functions are working very well and have an overall high acceptance rate of 80.33%.