bluuebunny/crossref_metadata_2025 huggingface dataset:
Students’ conceptual understanding and problem-solving of the Work-Energy and Impulse-Momentum Theorems in a flipped classroom
Authors: Alonzo S M D , Mistades V M
Published: May 2021

The study investigated the effect of using a flipped classroom approach on students’ understanding of the work-energy and impulse-momentum theorems. An intact class of Grade 12 STEM students took part in the study. The instructional materials needed for the lessons were compiled in a website that can be accessed by the students via desktop or a mobile device. The lesson calendar, study guide, modules, worksheets, and problem sets were organized in tabs and instructions were clearly stated for ease of use. Using Greeno’s model of scientific problem-solving and reasoning, the students’ solutions were analysed using maps of the problem-solving approaches they utilized. The students had difficulty comprehending problems and identifying which concepts are related to them. In terms of Greeno’s model, this implies that the students were not able to successfully translate concepts between domains. There were no traces of use of other domains apart from the abstract and symbolic domains, when an improved understanding must include translations between all four domains – namely, the concrete domain, which involves physical objects or events; the model domain, which refers to representations of objects or events; the abstract domain, which involves concepts or principles; and the symbolic domain, which is the mathematical representation of concepts.
Junior high school students’ risk perception of earthquakes in Bandung City
Authors: Saepulloh A , Siahaan P , Widodo A , Suhendi E
Published: May 2021

This study aims to determine students’ risk perceptions of earthquakes of junior high school students in Bandung City and whether factors such as gender, school location and school status affect their risk perceptions of earthquakes. A questionnaire on risk perceptions was given to 128 junior high school students in six schools in Bandung City. Based on data analysis using the independent t-test, there is a significant difference in risk perception between male and female students where female students (73.48) have a higher average risk perception score than male students (70.50). However, school location and school status do not affect risk perceptions since the results of the independent t-test showed no significant difference. This is because both are external factors, while the perception of risk is influenced by internal factors. In addition, among the risk perception components, the perception component towards disaster risk reduction has the highest value and the perception component toward risk potential has the lowest value. This indicates that the perception component towards disaster risk reduction gave the greatest contribution to the risk perception and junior high school students in Bandung City need to increase their risk perception of potential earthquakes.
Non stretching NMO (Normal-Moveout) correction with DTW (Dynamic Time Warping) algorithm, study case: shallow target seismic
Authors: Pebriana L V , Haris A , Abdullah A
Published: May 2021

Normal Move Out (NMO) Correction using Common Mid-Point (CMP) data based on shallow target seismic. It has several problems for NMO correction. This constraint is caused by changes in extreme velocity gradients, resulting in less optimum value shallow target Common Mid-Point (CMP). The increased velocity causes a stretch in the Normal moveout (NMO) process which can reduce the S/N ratio. To minimize the stretch effect on NMO processing, we use a dynamic time warping algorithm analysis seismic signal with dynamic time warping algorithm based calculation time shift at time series sequence. The results of the NMO-DTW show that there is no change phase and frequency in the trace seismic with the far offset. Because algorithm calculation is based on the initial trace on CMP.
Analysis of the rainfall event in 2018-2019 using the air stability index method at the Meteorological Station of Sultan Iskandar Muda Banda Aceh
Authors: Agroho F L , Syahreza S , Sugiyanto D
Published: May 2021

The purpose of the present research is to determine the forecast of rain events with good results and can provide information on rain events to be right on target. In this study, an analysis of rainfall events in 2018 and 2019 was carried out using rainfall and radiosonde data at the Meteorological Station of Sultan Iskandar Muda Banda Aceh. The analysis used with the atmospheric stability index method, which was taken by Radiosonde data, obtained information on atmospheric parameters such as temperature, dew point, pressure, and wind. This parameter can be used to predict rain events using the air stability index, where the indices used are Showalter Index (SI), Lifted Index (LI), CAPE, Total-Total Index (TT), K-Index, Severe Weather Threat Index (SWEAT). From the results of the stability indices verified by rainfall data observed by the Meteorological Station of Sultan Iskandar Muda. The results showed that the LI, SI, TT, and KI indices were good enough to predict rainfall, while the CAPE and SWEAT indices were still not good at predicting rainfall events. This information can then be used as a basic reference which is quite good to use through the upper air stability index approach in develop the rainfall forecast value.
The Development of student worksheets based on a scientific approach in the dynamic fluid concepts
Authors: Halim A , Ulandari S , Hamid A , Wahyuni A , Syukri M , Irwandi I
Published: May 2021

This study aims to develop student worksheets (SW) based on the Scientific Approach on the concept of dynamic fluids. Another objective is to determine the level of validity and response of students. The design of this study uses the R&D (Research and Development) method with the ADDIE model including the stages of analysis, design, development, implementation and evaluation. This research was conducted at the Public Middle School, Prisai Kutacane district, Southeast Aceh in class XI IPA 1, which numbered 36 people. The data collected comes from validity tests by experts, reliability, pilot tests and student responses. The data collection instruments that used were tests, questionnaires and observation sheets. The results showed that the SW validity level tested by experts was in the very good category. Based on the results of this study, it can be concluded that by applying the SW-based scientific approach, learning the dynamic fluid concept becomes more effective.
Influence of precast concrete joints on the ductility of beam elements
Authors: Bunyamin B , Silviana M , Lindawati L
Published: May 2021

This study aims to determine the effect of precast concrete joints on the resulting ductility. The research method was experimentally in a laboratory-based on ASTM (American Society for Testing and Materials) and ACI (American Concrete Institute). The design of concrete compressive strength was 14.50 MPa. The specimen used in this research consist of four beams, which are TRC (Top Reinforcement Concrete), THB (Top Hollow Block), BRC (Bottom Reinforcement Concrete), and BHB (Bottom Hollow Block). The size of beam used was 15 × 20 × 210 cm with the diameter of reinforcement bar were 12 mm (threaded steel) and 10 mm meanwhile the diameter of plain steel was 6 mm. The result showed that the ductility of TRC beam was 2.024, the ductility of THB beam was 2.526, the ductility of BRC beam was 1.237, and the ductility of BHB beam was 1.611. The ductility for hollow block is greater than normal reinforced concrete beam. Meanwhile, the load that occurs for hollow blocks is smaller.
Covid-19 forecast using Holt-Winters exponential smoothing
Authors: Djakaria I , Saleh S E
Published: May 2021

Covid-19 has spread throughout the world, including in Indonesia and it is known that the virus is reported to be highly contagious. Indonesia is the fourth-largest population for Covid-19 cases in Asia, while in the world the top three for covid-19 cases are United States, Brazil, and India, so it is inevitable, Indonesia will be greatly felt the spread of the pandemic coronavirus, even estimated to be freed from the coronavirus in a shorter period when compared to other countries with less exposure to COVID-19. In this paper, we study the covid-19 prediction model using Holt-Winters exponential smoothing, for a certain period. This study uses the Covid-19 pandemic data area of Gorontalo, Indonesia, from April 10 to October 13, 2020 (especially total cases). It was found that using Holt-Winters exponential smoothing, the best forecasting model is the one with smoothing parameters α = 0.1 and γ = δ = 0.5 for trend and seasonality respectively, which gives the smallest MAPE value of 6.14.
The use of Geogebra software in teaching mathematics
Authors: Tamam B , Dasari D
Published: May 2021

The development and presence of computer technology have opened opportunities and made it easy for many parties to use it in various aspects of life, including in the world of education, as a tool and means of supporting education. One computer program that can be used in mathematics learning is Geogebra software. Geogebra is a computer program to support teaching and learning mathematics subject, especially in geometry, algebra, and statistics. The various facilities provided by Geogebra software expect that it can be a great media to help its users visualise abstract geometric objects quickly, accurately, and efficiently. Furthermore, this article provides a brief description of Geogebra software as a medium for teaching mathematics. This article is library research. Here, the researcher uses the documentation method to collect data and then analyse the data gathered using content analysis. After analysed twelve related articles which revealed the advantages of using Geogebra in learning mathematics, it is found there are several significant results obtained. These findings, including Geogebra, ease students to comprehend geometry. Students also tend to be happier in learning geometry by using Geogebra, which operated by using a computer.
The development of mathematics teaching materials integrating by Augmented Reality Software and Android for deaf students
Authors: Anshori H , Novianingsih K
Published: May 2021

Mathematics has a unique concept and context, so mathematics is not easy to learn. Many students find it difficult to understand about mathematical concepts especially for students who has physical disability, such as hearing impairment. Teaching materials is required in mathematics learning, especially the topic of angles. One of the teaching materials on the topic of angle is developed using the integration of augmented reality (AR) software and android. The aims of this research are to describe the development phases and to describe the evaluation result of the teaching material integrated by AR software and android. This research uses the development (R&D) method by adapting and modifying the steps of R&D used by Borg and Gall. The sources of the data and information in this research is an expert in deaf education, a media expert, a mathematics teacher and a seventh-grader deaf student at a Junior High School of inclusion in Bandung. The result of this research shows that the teaching material integrating by AR software and android for deaf students is very good based on the referred category. It can be used in learning mathematics in school.
Ethnomatematics: exploring the fundamentally mathematical activities and concepts of syawalan in Kaliwungu Kendal
Authors: Fitriyah A , Fitriani U
Published: May 2021

Syawalan in Kaliwungu Kendal is a pilgrimage tradition to Islamic scholar grave who have a major influence in the spread of Islam in the surrounding area. This study aims to explore the fundamental mathematical activities and concept of the tradition. As the initial step of the research, the data about traditions are collected from various sources of literature. This research uses triangulation of sources by interviewing with religious leaders. The data are related to mathematical activities and concepts then. This article describes qualitatively about the results. The finding shows that it contains all of six fundamentally mathematical activities (explaining, designing, measuring, counting, locating dan playing). In the explaining activity, it contains a history of ritual and a shift in meaning to be a carnival. Then, the designing activity can be seen on the iron fence surrounding the tomb of Kyai Guru and various forms of objects in the carnival. Both contain geometry and transformation geometry. The locating activity comes about the determination of direction to graveyard and position of doing ritual syawalan. In mathematics, they can be solved by using optimization methods. Determining the size of blanket for a fence of Kyai Guru’s tomb belongs to the measuring activity. It can be done by using an integration or geometry concept. The counting activity is applied when people do a ritual “dzikr” (remembrance of Allah) by using a set number and playing as the last activity is visible in enjoying the rides and games that can be played in the carnival.
Students’ number sense on fraction problems
Authors: Sukma Y , Somakim S , Indaryanti I
Published: May 2021

This study aims to reveal how students’ number sense is used for solving fraction problems using a descriptive qualitative study design. Nine seventh grade students in Palembang was involved in this study who were selected purposively. Data were collected using a constructed-response test and interview. In taking the test and interview, participants were accompanied by a teacher who taught at the school, considering that they did not hesitate to communicate with the teacher and participants had studied fractions with that teacher. The instrument in this study consisted of four number sense problems that were related to fractions. This study showed that all participants could only fulfil one number sense component, namely the number of operations. The students were capable of operating fractions, but they did not possess the conceptual understanding.
A Meta-Analysis of the Past Decade of Mathematics Learning Based on the Computer Algebra System (CAS)
Authors: Tamur M , Ksumah Y S , Juandi D , Kurnila V S , Jehadus E , Samura A O
Published: May 2021

Hundreds of studies have been found in the literature on mathematics learning supported by the use of the computer algebra system (CAS). However, there are numerous reports with mixed and even contradictory findings. This has the potential to lead to errors in concluding. This meta-analysis study was conducted to test the overall effect size (ES) of CAS-based mathematics learning. This study also aims to analyze the level of variation in individual studies and consider its implications. The ERIC, SAGE, SpringerLink, and Google Scholar databases were examined to achieve relevant research. The search results found 136 related journal articles published between 2010 and 2020. As per the study protocol, 31 articles were eligible, and 36 ES were analyzed. The calculation tool is Comprehensive Meta-Analysis (CMA) software, and the Hedges-g equation is used based on the random-effect model. The analysis results revealed that overall the use of CAS ES had a large positive impact on students’ mathematical abilities (ES = 0.89; standard error 0.08). Moderator analysis shows that CAS’s use is more effective, considering the difference in education level and CAS type. The research implications are discussed and provide important information as a fundamental idea for further meta-analysis studies on CAS’s effects.
Students’ attitude towards the implementation of six-questions cognitive model on fraction
Authors: Zhou Y , Wijaya T T
Published: May 2021

This study aims to analyze students’ attitudes towards the implementation of the six-questions cognitive model in teaching fractions. Samples in this study were taken in elementary school, Cianjur, Indonesia. The method of this study is a quantitative method by giving questionnaires to 44 elementary school students. The questionnaire amounts to 15 items about the six-questions cognitive model in teaching fractions. Data questionnaire was analyzed using Microsoft excel and SPSS 19.00. the study showed that percentage Students’ attitude towards implementing the six-questions cognitive model in teaching fractions was 78.03%. This proved that most of the students have a positive attitude towards implementing the six-questions cognitive model on fractions. The results of attitude data analysis also showed that the average student attitude was 3.12 larger than 2.5. This proves that students prefer the teacher to use the six-questions cognitive model on fractions than the traditional method. In further research, the six-questions cognitive model can be used on other mathematical topics.
The analysis of students’ mathematical understanding ability in solving two-variables linear equation Ssystem during the Covid-19 pandemic
Authors: Syati L M I A , Priatna N
Published: May 2021

This research aims to determine the mathematical understanding ability of junior high school students about the Two-Variable Linear Equation System (SPLDV) during the Covid-19 pandemic. This research is a qualitative descriptive study. Subjects in analyzing the mathematical understanding ability of junior high school students were grade IX students. The research was conducted at the beginning of the odd semester of the 2020/2021 school year in Bandung. The instrument in this study was a written test consisting of 4 essay questions that were given online via a google form. Each question represents indicators to be measured. The indicators measured are defining a concept, indicator of identifying and making example and non-example, indicator of using, utilizing, and choosing appropriate procedure and indicator of applying concept or algorithm toward problem-solving. Based on the research conducted, it was found that the level of students’ mathematical understanding ability for each indicator could be achieved well. However, especially for an indicator of applying concept or algorithm toward problem-solving, students have not been able to interpret the problem.
Ethnomathematics exploration of the rattan handicrafts that can be applied in mathematics learning in secondary schools
Authors: Prastika C , Anwar  , Abidin Z
Published: May 2021

Research on cultural values in mathematics learning is not widely available by researchers. Mathematical elements contained in culture need to be discussed further so that they can facilitate contextual mathematics learning. To realize this learning, it is necessary to first identify by exploring local cultural relics that express their relationship with mathematical concepts. The researcher tries to find the mathematical elements contained in the rattan handicraft products of the Lhoknga community. The researcher then describes and analyzes the mathematical elements to be used in understanding the appropriate geometric concepts. The research employed an exploratory descriptive qualitative approach. The research subject was a rattan craftsman from the Lhoknga community, in Indonesia, obtained by purposive sampling. Research data were obtained through semi-structured interviews conducted by researchers. Data collection uses a video recorder, and then data is documented for analysis using the Spradley model. The results showed that the rattan handicraft products produced by the Lhoknga community were food serving cover, pumpkins(boh labu), onion basket, parcel basket, and fruit basket. Geometry concepts contained in all of these products are lines and angles, circles, transformations, and curved side geometry. This study could also be developed on other mathematical materials.
A meta-analysis study of the effect of Problem-Based Learning model on students’ mathematical problem solving skills
Authors: Musna R R , Juandi D , Jupri A
Published: May 2021

This study aims at analysing the effectiveness of Problem-Based Learning (PBL) on students’ mathematical problem-solving skills. The Effect Size in some research which applied PBL was examined using the meta-analysis technique. Empirical data were obtained using electronic search engines, including Google Scholar, Portal Garuda, ERIC, SPRINGER, and national journals URL; coding was used as the instrument. Data analysis was conducted using the meta-analysis software, namely Comprehensive V.03. The method included systematic reviews on research findings in Indonesia’s national e-journals, with 16 articles meeting the inclusion criteria selected as the sample. The publication bias test was carried out so that 13 articles were obtained which would be analysed further. The meta-analysis study reveals that the overall effect of implementing PBL on students’ mathematical problem-solving skills had a high category of effect. Moreover, the effect size of the application of the PBL model on solving ability between study groups was not different based on the characteristics of the level of education, class, sample size, and study year. The results of other studies, it was found that there was a significant difference in the effect size between study groups based on the duration of learning.
Misconceptions of basic algebra on linear equation in one variable material
Authors: Yansa H , Retnawati H , Janna M
Published: May 2021

This research was conducted to identify students’ misconceptions of algebraic concepts. The researcher implemented a qualitative method with phenomenological design. The data were collected by conducting a test and an interview. Thirty students at the seventh grade were given a test, and six students were chosen to be interviewed. The subjects were selected by applying a purposive sampling technique. The research results indicated that the students have several misconceptions of basic algebra, such as on the degrees of the equation, variables, coefficients, and constants. Besides, students have difficulties identifying some variables in a function which resulted in errors in identifying the general form of linear equation in one variable. In other words, the students have not reached the algebraic thinking level yet. One of the factors which cause misconception is students’ understanding of the basic concepts presented in the textbook, and the information delivered by the teacher was understood partially. As a result, the implications of this study are the students need special assistance. At the same time, innovative teaching strategies must be implemented by the teacher in teaching linear equation in one variable.
Formulation and evaluation of the Exopolysaccharide compound extract lotion from the Microalgae Spirulina sp
Authors: Winahyu D A , Primadiamanti A
Published: May 2021

Spirulina sp. is a type of microalgae containing exopolysaccharide compound composition. Exopolysaccharide compounds are biopolymers that have very wide applications, including as antioxidants. Antioxidant compounds have the potential to be developed as additives in cosmetics. Antioxidant compounds are useful for warding off free radicals from UV rays. This study aims to make a lotion formulation of exopolysaccharide compounds from microalgae Spirulina sp. This research was conducted by extracting exopolysaccharide compounds from Spirulina sp. using 96% ethanol. The lotion formulations were made with various concentrations of 0.5%, 1% and 1.5% exopolysaccharide compounds. The exopolysaccharide compound lotion then tested the lotion evaluation including organoleptic test, pH, homogeneity, dispersion, and irritation test. Organoleptic test results showed a white lotion, odorless, soft texture. The pH value of the exopolysaccharide compound lotion ranges from 5.75 to 6.15. Homogeneity shows no solid particles and meets the conditions. The spreadability of the lotion is between 5.8-6.0. The results of the irritation test using test animals showed a primary irritation index of 0, so it did not cause irritation. Based on the research results, it can be concluded that the exopolysaccharide compound extract from the microalgae Spirulina sp. can be made into a good and stable lotion formula.
Effect of Phosphate species on biomass carbonization
Authors: Rahmawati W R , Rohaeti E , Abidin Z , Trivadila
Published: May 2021

Dye waste produced from industry causes environmental damage and harmful to living organism, so it is necessary to find a solution to reduce this problems. The dyes that are often used in industry are methylene blue and methyl orange. Methylene blue and methyl orange can be removed from the environment through the adsorption process. Adsorption process using activated carbon is an easy, effective, and efficient way to treat dye waste. Palm kernel shell as agricultural waste can be used as a raw material in preparing an activated carbon. This method used chemical activation to produce activated carbon. Some sample of palm kernel shell was mixed with different phosphate species, such as (NH4)H2PO4, (NH4)2HPO4, and H3PO4 with various concentration (1%, 5%, 10%, and 15%). The different phosphate species producing different yields because it has different roles in the carbonization process. Palm kernel shell is added with activating agent with a ratio 1:1 (w/v). Sample was put in a furnace at 600 °C for 1 hour. The sample was washed with distilled water until neutral pH, then dried in an oven at 105 °C for 1 hour. The phosphate acid is able to inhibit the combustion process and increase the yield. The highest yield was produced by the addition of H3PO4. The adsorption isotherm of the activated carbon follows the Langmuir isotherm.
Identification of Indonesian clickbait news headlines with long short-term memory recurrent neural network algorithm
Authors: Siregar B , Habibie I , Nababan E B , Fahmi
Published: May 2021

Online news portals are one of the main sources of information currently most accessed by the public. With the number of Internet users increasing day by day, online news portal business entrepreneurs must find ways to remain able to compete to attract netizens’ attention to open their news portals. One of the techniques used is to implement clickbait to increase visitor traffic or pageviews. The characteristic of clickbait headlines is that they hide the facts or actual news content in the title section. Clickbait’s goal is to get curious Internet users to click on the link with the headline. This research aims to detect Indonesian-language clickbait headlines automatically by utilizing Indonesian language news headline data obtained from several online news portals with the highest amount of traffic on the Internet. This research uses the Recurrent Neural Network method based on Long Short-Term Memory. The model is built using word embedding to represent text data into vector data. The result of this research is a model with a testing accuracy of 83% and a system that is able to classify headlines whether they are clickbait or not.
Security and privacy awareness of smartphone users in Indonesia
Authors: Amin M , Tasmil  , Herman  , Bahrawi  , Alam N , Dhahir D F , Hadiyat Y D
Published: May 2021

The number of smartphone users in Indonesia is increasing every year and has been growing rapidly since Covid-19 hit Indonesia. Smartphones store a lot of personal and information data, such as photos, videos, contact lists, e-mails to social media accounts. A large amount of personal data on smartphones causes an increasing number of threats to information security and privacy. This study aims to measure the knowledge and level of awareness of smartphone users in Indonesia on information security and privacy. This study modify the existing measurement methods. The results showed that there are still many Indonesians do not know the information security and privacy on their smartphones. The results also show that the level of information security awareness among Indonesians is still low.
Seawater intrusion analysis in the coastal region of Banda Aceh by using Geographic Information System (GIS)
Authors: Tanjung M , Syahreza S , Rusdi M , Yusibani E
Published: May 2021

Seawater intrusion is an environmental problem in many coastal regions which can harm the sustainability of groundwater resources in the future. Banda Aceh as the capital city of Aceh Province has a wide coastal region. The societies are mainly dependent on freshwater. Spatial Distribution of seawater intrusion has been studied using Geographic Information System (GIS) technique. In this research, 57 samples of groundwater were collected from 9 sub-districts of Banda Aceh. A portable Global Positioning System (GPS) was used to collect the coordinates of each sample site. This research aimed to analyse and generate the spatial distribution of seawater intrusion in Banda Aceh coastal region from the measurement of groundwater Electrical Conductivity (EC) and Total Dissolved Solids (TDS) values in the fields. The EC and TDS were used as indicators to assess the potential of seawater intrusion in the coastal aquifers. The results indicated that spatial distribution of seawater intrusion scattered in northern part of Banda Aceh. However, the analysis and measurements showed that the extent of EC and TDS values varied prominently across these sites, with the maximum EC value of 6.270 μS cm-1 and TDS value of 4.420 mg l-1 found at Neusu Aceh Village in Baiturrahman sub-district. Moreover, the minimum EC and TDS values of 217 μS cm-1 and 100 mg l-1, respectively, found at Mulia Village in Kuta Alam sub-district.
Assessing the problem-solving skills among foundation level students: A STEM case study
Authors: Maegala N M , Nor Suhaila Y , Hasdianty A , Marini I , Hazeeq Hazwan A
Published: May 2021

The level of unemployment among fresh graduates in Malaysia is worrying with one in five graduates still jobless after six months of graduation. One of the reasons for this scenario as claimed by employers is the poor quality of graduates with regards to attitude and skills. STEM (Science, Technology, Engineering and Mathematics) education could help students by developing their problem-solving skills. The STEM module will encourage critical thinking skills, which is essential in troubleshooting a complicated scenario. This case study assessed the initial level of this vital skill at the beginning of the university study pipeline: the foundation-level. Four groups of students from different foundation programs in Universiti Selangor were selected for the assessment. It was revealed that 70 % students had the drive to work smartly until the problems were resolved. The rest of the students (30 %) responded that they will seek external sources to solve the problem if the problems were challenging to them. It was fascinating to note that 100 % students were committed to not quit until the problem was sorted out based on their responses. Completing STEM activities therefore, had enhanced the students’ creativity, increased their confidence level and improved their team work.
Development and Validation of Grade 10 Physics Test in K-12 Science Curriculum
Authors: Jalon J B , Mistades V M
Published: May 2021

The purpose of this study was to develop and validate a Physics test that measures the competency level of Grade 10 students in the new Philippine K-12 Science Curriculum. The test was composed of items in electromagnetic spectrum, light, and electricity and magnetism. During the test development, the test was divided into 2 sets and underwent content and face validation from 6 Physics content-experts. It was determined that for both sets, at 95% confidence, the levels of reliability ranged from moderate to good. After revising the items based on the feedback from the experts, Set A and Set B were administered to 569 students and 526 students, respectively, and 520 responses from each set were included in the item analysis. Using the IRT, items that violated the unidimensionality IRT assumptions were removed and item characteristics were computed for item selection. The data generated were most fit in unidimensional 2-PLM with acceptable marginal reliability response pattern scores of 0.70 and 0.67 for Set A and Set B, respectively. The final form of the test contains 35 items covering all the competencies in said topics with medium to hard difficulty level and high discrimination index. The distribution of the items for the final Physics test form is balanced; 50% measures low order thinking skills and the other 50% measures higher order thinking skills. The results also showed that item parameters estimated using IRT were invariant. Based on the hard difficulty level of the test sets and average scores, the students performed fairly-well.
Impact of multi-representation-based video on students’ learning outcome
Authors: Halim A , Husna N , Samsul  , Evendi  , Nurulwati  , Mahzum E , Irwandi I
Published: May 2021

This study aims to determine the effect of using multi-representation based video media on high school students’ learning outcomes. The study used a quantitative approach with a quasi-experimental design. The research sample was 24 students of class X IPA-1 for the control group and 22 students of class X IPA-2 for the experimental group. In the experimental group, the multi-representation based video media were used during instruction, meanwhile in the control group the instruction did not involve any multi-representation based video media. The data were collected from students’ responses on a test for student learning outcomes and the data were analysed using the t-test. Based on the results of the analysis, it is known that student-learning outcomes have increased with the average post-test score of the experimental class 82.73 and the average value obtained in the control class post-test activity is 75.91. Based on the results of hypothesis testing at the significant level ofα= 0.05 and df = 44, the t-table = 1.68 and the t-count = 3.32. Thus, it can be said that there is an influence from the use of multi-representation based video media on student learning outcomes on the concept of Works and Energy.
The perception of pre-university students on STEM
Authors: Nawawi N M , Sout N M , Hassan K B , Samah N N A , Kamaruddin H H , Khalid R M , Azman H H
Published: May 2021

STEM is an integrated teaching and learning approach in Science, Technology, Engineering and Mathematic. The decreasing enrolment of students in STEM-field is alarming and impacting the industry as well as the university students’ intake. This study is focusing on one hundred of pre-university (foundation) students by looking at their understanding on STEM education and the impacts of STEM module in nurturing their interest on STEM. The study applied naturalistic inquiry to assess their perceptions of STEM prior and subsequently after involve in a STEM module activities. The results showed that majority of students are female and from different background, they are interested in learning science shown by the increase of agreement to 38% and 40% after the activity with the decrease in the percentage of neutral and disagree level. The percentage of interest on STEM was decreased after the activity. However, the level of confident about their ability towards science was increased. The confident level lead the respondents to choose career related to science/STEM based on the increase level of agreement from 22% to 28% and from 24% to 32% for strongly agree and agree relatively. Hence, the outreach with attractive activities would potentially add value for students’ intrinsic motivation for science and science learning.
The impact of implementation of STEM integrating project-based learning on students’ problem-solving abilities
Authors: Nurmaliah C , Azmi TN , Safrida  , Khairil  , Artika W
Published: May 2021

Problem solving is one of the higher thinking skills required and must be built by students. This study aims to examine the ability of students to solve problems through the implementation of the STEM approach integrating PjBL model on the Immune system. This study was carried out at senior high school in Banda Aceh and Aceh Besar district. This study was an experimental pretest design with a non-randomized control group. The population was all 11th-grade students from both schools. Thus, the Science Class 1 and 3 (of SMAN 5 Banda Aceh) and the science class 1 and 4 (of SMAN 1 Darul Imarah) were selected as the sample. The test attached in the student working sheets, which was constructed using an Engineering Design loop, is the instrument used to assess the problem-solving capacity. The data from the study have been processed and descriptively analyzed. The results showed that the STEM approach integrating PjBL model could improve the abilities of students to solve problems. Therefore, the implementation of STEM approach combined with PjBL can be used as a strategy for teachers to carry out learning activities to enhance the meaningful learning and student’s capability in solving problem of biology content.
STEM learning of “value-added on banana chips” to enhance students’ motivation and entrepreneurship attitude in a rural school
Authors: Amri H , Adlim M , Nurdin S
Published: May 2021

The unemployment of high-school graduates continuously increases because they do not have the required skill to work. Life skill training is not programmed for such general schools; however, entrepreneurship practice is introduced in the regular curriculum. Life skill learning, which integrates science and technology, is known as STEM learning. This study aims to investigate the implementation of STEM learning with the topic of’the increase of value-added on banana chips" to enhance student motivation and entrepreneurship attitude in rural senior high schools. The STEM module was previously developed with the research and development method and ADDIE model. The module was validated before being used. Several student worksheets were used to collect data on motivation and entrepreneurial attitude before and after STEM learning was conducted. STEM-based student worksheet had been validated, and it was valid to be used. The scale of student creativity during the implementation of STEM was categorized high with the component of elaboration (83.3 %), originality (87.5%), and fluency (75%). The accumulation of mean score indicators of student motivation and entrepreneurship attitude increase from 46.8% to 75.6%, which means students are very interested in entrepreneurship. Entrepreneurship character can be induced by STEM learning.
Interpreting the investigative science learning environment (ISLE) for its implementation in Indonesian STEM education
Authors: Oktavia R , Irwandi  , Melvina  , Rajibussalim
Published: May 2021

This paper reports a qualitative inquiry to investigate the application of the Investigative Science Learning Environment (ISLE) approach as a framework for teaching and learning physics. The aims of this study are to investigate how ISLE processes are applied, what the perspectives of instructors and students on the ISLE approach are, how the ISLE approach could be possibly applied in the physics courses and other STEM courses in Indonesia. Participants in this inquiry consist of the inventor of ISLE, three ISLE instructors, and students in an ISLE lab session. We used qualitative case study method and narrative data analysis in the process of evaluating data from observations, interviews, and ISLE-based learning materials and publications. It was found that the ISLE approach was applied smoothly in the class and lab sessions. The ISLE instructors are those who believe in the philosophical and epistemological reasoning behind the framework and the importance to nurture students’ scientific abilities. Some students liked the ISLE approach, some didn’t. Those who liked ISLE found that they enjoyed the process of thinking and discussing in learning. It is very likely to apply the ISLE approach in Indonesia for physics courses, but it will be challenging for other subjects.
Homegardening for food and nutritional security and for biodiversity conservation during the pandemic times
Authors: Kumar B. Mohan
Published: May 2021

The COVID-19 pandemic and the associated lockdown – often regarded as a “Global Human Confinement Experiment” – has created an unprecedented situation around the globe. While the reduced human presence and mobility, causing declines in visitation rates of protected areas, may generally favour biodiversity conservation in natural ecosystems, the pandemic has caused major disruptions of the food supply chain. Furthermore, the “reverse migration” of labour has led to scarcity of workforce in many localities hitting agricultural operations. The cumulative effect is food insecurity for millions of people in both the developed and developing countries. It is therefore crucial to encourage local food production systems at the household and community levels. Tropical homegardens, which are resilient and sustainable production systems, are important in this respect. Homegardening is a unique farming system, which combines divergent production and service functions around the homesteads and contribute to the supply of fresh food at the household level. Being a decentralized production system, such practices may reduce food wastage along the supply chain. A prominent structural attribute of homegardens is the great diversity of species ranging from creeping herbs to tall trees and livestock, implying their potential for biodiversity conservation. Although land-use systems are challenged as never before in the wake of the pandemic, homegardening may provide a way forward to overcome the looming food insecurity at the household level in the rural areas of many countries.
Key drivers of organic rice productivity in Sleman and Magelang Regencies
Authors: Devi Laksmi Yustika , Irham  , Subejo  , Anatasari Esti , Nurhayati Azizatun , Wahyu Widada Arif
Published: May 2021

Organic farming system in Indonesia had been growing continuously in the recent years. Organic label could only be put on products which were complied with organic standards and regulations as well as certification requirements. As the world became more global, in addition to organic national certification, Indonesian organic farmers needed to comply with international organic certification so that they could enter the open market. This study attempted to: (1) provide a descriptive analysis of rice organic farmers’ characteristics in two locations of organic farming, (2) understand farmers’ knowledge and motivation on organic farming, and (3) analyse the gaps between farmers’ practice in organic farming and certification standard requirements. Results of the study showed that, basically, all farmers understood the concept of organic farmers. However, the farmers had not fully implemented the procedures as required in the Indonesian National Standard (SNI), let alone international organic certifications (IFOAM and USDA). There were several aspects that need to be improved in order to close the gaps between farmers’ practice in organic farming and certification standard requirements.
Adaption of local rice cultivars Banten to drought environment
Authors: Rusmana  , Ritawati S , Rohmawati I , Ningsih E P
Published: May 2021

Limited water availability or drought is an abiotic factor that inhibited rice production. One of the efforts to overcome this problem is by using plant varieties that can adapt to conditions of limited water availability. This study aims to determine the physiological and agronomic responses of some local rice cultivation in South Banten to drought conditions. The research was conducted from April to October 2017 in the greenhouse of the Faculty of Agriculture, Sultan Ageng Tirtayasa University, Banten. The experiment was based on factorial experiments in a completely randomized block design (RBD) with 3 replications. The first factor is the frequency of irrigation which consists of 2 levels, namely irrigation every 7 days and every 9 days. The second factor is the local rice cultivar in South Banten which consists of 8 levels, each of which consists of 7 local cultivars and one comparison variety, namely Rencong, Ketan Dewo, Kiara, Inpari 10 (as comparison varieties), Super, Kapundung, Cimoherang, and Ketan Elfi. The results of research show that cultivar of Ketan Dewo adaptive in drought environments.
Tofu wastewater industry with urea fertilizer as a cultivation medium for the microalga Spirulina plantensis
Authors: Soedibya P HT , Pramono T B , Sukardi P , Kusuma B , Marnani S , Fitriadi R , Aditama T
Published: May 2021

One of the limiting problem in fish larvae rearing is the availability of live feed such as zooplankton and phytoplankton. Spirulina platensis is a phytoplankton with important uses in fish larvae culture either as a live feed or an ingredient supplementation in the feed. However, its cultivation has high economic costs associated with the growth medium. One of the alternative medium that potentially reduce costs and environmentally friendly is tofu wastewater. The purpose of this research is to evaluate the combination of tofu wastewater with urea for the cultivation of S. platensis. We investigated the growth of S. platensis in tofu wastewater containing various concentrations of urea: 0 g (control), 10 g, 20 g, 30 g, or 40 g urea added to 3 L diluted (2:1) tofu wastewater. The S. platensis productivity parameters were measured are population density, specific growth rate, and doubling time. The population density growth was significantly different, while the specific growth rate and doubling time were not significantly different for the various urea concentrations. The optimum growth was observed with 10 g urea per 3 L medium. This combination of tofu wastewater with urea could be a cost-effective medium for the cultivation of S. platensis.
Factors affecting electricity demand in Cambodia
Authors: Dy Virak , Paoprasert Naraphorn
Published: May 2021

Recently, there are many factors affecting electricity demand in different ways. The relation between electricity demand and economic, demographic, increasing new consumer connection, technological, climate, and government policies on electricity price, etc. This study aimed to identify the main factors that affect electricity demand and observed which factors had more relation affecting on electricity demand in Cambodia. The first method of defining relation to predicting annual power demand in the future on economic factors based on annual data from 2004 to 2018. The method was paring GDP with power demand delivered using regression analysis, then with GDP and Total consumer connection by multi-regression analysis. Secondly, for environmental factors affecting on predicting daily maximum power demand (Pmax) by temperature and humidity from 1st Jan 2020 to 20th July 2020, using regression and multi-regression respectively. As a result of linear regression, we observed annual new consumer connection and GDP of Cambodia were the best factors affecting electricity demand. However, for environmental factors, temperature and humidity are not really affect the curve of (Pmax) from our data. Daily temperature in Cambodia could be explained only 4.2% of daily maximum electricity demand while humidity was not significant.
Design improvement for safety risks using hazard and operability method
Authors: Kristiana Retna , Kushardiono
Published: May 2021

Application of occupational health and safety procedures consists of programs that aim to protect and welfare the workers. However, in reality, many workers still carry out such violations related to work procedures. This study aims to determine the risk of breaches that affect the procedure works and know the dominant risk affecting workers on the World Trade Centre (WTC)-3, Jakarta. This research approach uses the HAZOP method and SPSS to analyze the validity and reliability of data. The methods used to identify risks are brainstorming or interviews with the experts and operability study (HAZOP). From these results obtained on 14 sources from 23 sources of work activities with a high-risk level, which is the dominant risk, it should get priority to be fixed or controlled to minimize accidents at the height of the World Trade Center (WTC)-3, Jakarta.