bluuebunny/crossref_metadata_2025_split huggingface dataset:
The new hilaal visibility criterion for tropical region
Authors: Utama J A , Simatupang F M , Amsor  
Published: November 2019

Abstract
We propose a new Hilaal (lunar crescent formed immediately after conjunction) visibility criterion apply to tropical region utilizing modified mathematical model of near-sun objects visibility. By using only naked eye positive sightings of Hilaal, then we are calculating the Moon and Sun observation parameters to obtain the visibility function for each case. Moon – Sun altitude difference (ARCV – Arc of Vision) and elongation (ARCL – Arc of Light) at the first observable moment have been chosen as parameters and used in developing new visibility criterion. The data show that the minimum ARCV and ARCL value for naked eye observation at the moment of Hilaal is observed are 8.4° and 7.1°, respectively. Our results can be proposed as a scientifically criterion for constructing Hijri calendar for tropical region (including Indonesia) as an alternative to Jakarta Recommendations criterion.
Pore structure characterization of concrete mixtures with different aggregates using digital image processing and analysis
Authors: Latief F D E , Mohammad I H , Rarasati A D , Handika N 
Published: November 2019

Abstract
The presence of pores in a volume of concrete obviously affects the compressive strength of concrete (fc). Furthermore, characteristics of pores formed in concrete may vary, such as in shape, in size, in volume, and/or in its orientation tendencies. These characteristics also depend on the ingredient materials and the concrete casting process. In this research, three types of concrete in a form of cylindrical sample were analysed in order to investigate their pore structure characteristics. The first type of specimen is a core sample taken from a beam of an existing reinforced concrete structure building. It has 18 MPa of compressive strength. For the second type, an instant concrete with 40 MPa of designed compressive strength and 9 cm of slump test was chosen. The third sample is a concrete with Oil Palm Shell (OPS) as coarse aggregate substitution with 17 MPa of compressive strength. These three kinds of sample were scanned with a Bruker Micro-CT SkyScan 1173 device. The scanning process produced a set of projection images which were then reconstructed to obtain three-dimensional digital grayscale images. The pores inside the concrete sample are detected as dark pixels, which represent low-density structure. Based on the detected pores, the characteristics such as the volume distribution, the size distribution, the spatial distribution, as well as several structural descriptors such as shape, orientation and eccentricity of the pores were analysed. This study concludes that the type of aggregate greatly influences the characteristics of the pore formed in a concrete.
Air pressure in mini hovercraft
Authors: Triayomi R 
Published: November 2019

Abstract
calculate the pressure on the mini hovercraft experiments by using the formula by knowing the mass of large balloon is 20,49 gr with a force of 0,2045 N was counted after balloon filled by air. The surface area was 0.011304 m2 so the obtained pressure was 18.09 Pa. Calculation of a small balloon pressure with a mass of 20.3 g calculated after the balloon is filled with air by the force of surface area 0.203 the N of the surface area 0,011304 m2 then the pressure of Pa is 17.95. A simple mini hovercraft that used for physics learning media on the pressure principal explains the utilization of air pressure on the mini hovercraft. The making of this mini hovercraft as a learning media is aimed to show the concept of pressure. From the results of observation and analysis of the data, it was proved that air pressure generated can produce bigger lift than the mini hovercraft weight. The air flowing out from the balloon in the bottom caused the mini hovercraft to be pushed upward.
Genetics in socio scientific issues: measuring rebuttal abilities in scientific argumentation
Authors: Anisa A , Widodo A , Riandi R , Muslim M 
Published: November 2019

Abstract
Genetics is one of the most important concepts in understanding Biology. Even though it is now widely applied in various socio-scientific issues, often, it also causes debate in the society, especially in the learning process. Students’ argumentation in addressing socio-scientific issues that arise can be used as an assessment to see how students think in supporting or denying their claims. Utilize the case study on 21 high school students in one of West Java public school; the study aims to see students’ rebuttal ability and the genetic concept they use to support their denial. The results showed that 34.92% students giving rebuttals, with 14.29% of them provide conceptual support that relevant to genetics, while another 47.62% students provide a general Biology conceptual support, 14.29% students provide a misconception of genetics, and 23.81% using an irrelevant concept. It shows that it is important to do the learning that supports the growth of rebuttal ability in the learning process so that students’ critical thinking ability becomes better, especially in understanding the genetic concepts in school and social life.
Media needs of plant anatomy practicum on digital microscope blended learning system on student naturalist intelligence
Authors: Sugianto S , Fitriani A , Anggraeni S , Setiawan W 
Published: November 2019

Abstract
Naturalist intelligence of students is rarely measured by lecturers and the anatomy practicum media of blended learning systems based on digital microscopes has never been applied by lecturers as a plant anatomy practicum on campus, then conducted research with the aim to determine the media needs of plant anatomy based on microscope towards student naturalist intelligence. This research is a quantitative study using the True-Experimental Design design with the design of the Posttest-Only Control Group. The population in this study were all level II students of Wiralodra Indramayu University which consisted of 3 classes with a total of 96 students. The sampling technique using the cluster random sampling type probability sampling technique obtained Bio C class as the experimental group and Bio A class as the control group. The instrument in this study is a student’s naturalist intelligence test which consists of 5 questions. Based on the results of the study, it was found that the average in the experimental class was 74 and the control class was 63.75. With a significant level (α) = 0.05 and degrees of freedom (db) 62, tcount = 28.29 and table = 2,000. Because tcount> t table. This means that the media needs of plant anatomy practicum on digital microscope-based blended learning system have a significant effect on the naturalist intelligence of prospective students of biology education teachers.
Strengthen the student environmental literacy through education with low carbon education teaching materials
Authors: Amin M S , Permanasari A , Setiabudi A 
Published: November 2019

Abstract
Science education should be able to make the students better understand and be sensitive to the environment. Nowadays, earth is affected by the greenhouse effect and global warming, which is caused by greenhouse gas emissions, especially CO2. Instil the awareness and sensitivity (environmental literacy) about the environment is very important to do. Education is the best way to grow and develop environmental literacy among the younger generation. The educational component that is very easy to be used as a means is a teaching material in the form of low carbon teaching materials. This study aims to provide a formulation of the social context associated with a reduction in CO2 emissions and its scientific explanation, as well as describe the pattern of presentation of these substances in the teaching materials. Low carbon teaching materials become a vehicle that raises the whole substance relating to CO2 emission reduction efforts. Substance in these materials taken from the contexts of everyday life, for example the CO2 emissions of various types of lamp, CO2 emissions in the type of fuel, CO2 emissions in the type of energy (LPG-LNG-Biogas), until the CO2 emissions from cigarette that burned. These contexts are given its scientific explanation (including calculations) but are presented in a simple-structured in the low carbon materials thus substantially easier to grasp. The presentation is also accompanied by analysis, stimulation of high order thinking skills, activities, and personal-contextual analysis
Context-based content representation, curriculum understanding, and self-efficacy: a correlation study on pre-service chemistry teacher
Authors: Wiyarsi A , Sutrisno H , Rohaeti E 
Published: November 2019

Abstract
CoRe is one of the Pedagogical Content Knowledge (PCK) representation that it important for pre-service chemistry teacher. This study aimed to analyze the correlation among pre-service teachers’ understanding of curriculum (UC), understanding of context-based learning (UCB), self-efficacy (SE) and the ability for designing Content Representation context-based chemistry (CoRe-CBC). A correlational study was conducted on 41 pre-service chemistry teacher of postgraduate program. Pre-service teachers’ understanding of curriculum was assessed using a 30-item of multiple choices. The 6-open ended questions were used to measure the understanding of context-based chemistry learning. Students’ self-efficacy was assessed by a questionnaire with 18 items. A group of experts confirmed the construct and face validity of all the instruments. Data analysis used Pearson correlation and regression. The result showed a high correlation between UCB and ability for designing the CoRe-CBC also with UC. A low correlation occurred between UC and the ability for designing CoRe-CBC. The variable of UCB had the biggest effect on the pre-service teacher ability for designing CoRe-CBC. However, the pre-service chemistry teacher still had less understanding in context-based chemistry learning. This study suggests that pre-service teachers’ understanding of curriculum and context-based chemistry learning should be improved. It will useful to support the implementing context-based chemistry learning.
Assessing knowledge management system maturity level of teacher professional competence
Authors: Fitriasari N S , Megasari R , Piantari E 
Published: November 2019

Abstract
Improving the teacher competence is the most important thing to improve the quality of national education. Indonesia Government regulates the teacher professional competence so it can be measured and evaluated. Knowledge Management System has been widely implemented in schools to improve the effectiveness of learning. However, it is not specifically for teacher professional achievement. This paper presents the assessment process to measure the maturity level of Knowledge Management System for Senior High School Program in Lab schools UPI. The assessment of maturity level is based on five elements of Knowledge Management System i.e. Organization, Knowledge Management Process, Knowledge Management Technology and Knowledge Artefact. 3T Frameworks was used to measure maturity level of Knowledge Management System.
Learning Management System (LMS) model based on machine learning supports 21st century learning as the implementation of curriculum 2013
Authors: Herbert  , Putro B L , Putra R R J , Fitriasari N S 
Published: November 2019

Abstract
The 21st Century learning is an effort to facilitate learners in the 21st century to experience the best learning experience so that they can achieve the learning objectives effectively. The 2013 curriculum is a shift in the 21st century education paradigm in Indonesia. One of the prominent features of 21st century learning is digital-based learning. Digital-based learning based on this research apply Learning Management System (LMS). The application of Machine Learning (Online Collaboration, Behavioural Tracking, and Learning Analytics) to LMS has great potential for realizing 21st century learning. The benefits of implementing machine learning are for LMS automation in the assessment of the 21st century learning process, making it easier for teachers to analyse learning outcomes. The purpose of this research is to create LMS model based on Machine Learning to support 21st Century Learning as the Implementation of Curriculum 2013. The utilization of machine learning shows positive result to 21st century learning process. Automated analysis can support the 21st century learning process.
The development of computer adaptive test and item response theory with 4 parameters based the logistics model
Authors: Riza L S , Nurjanah N S , Wihardi Y 
Published: November 2019

Abstract
Students’ abilities can be measured by making a test whose the number and content of questions have been determined for each student. However, it is less effective because the distribution of students’ abilities is different. By using Computer Adaptive Test (CAT) and Item Response Theory (IRT), the test can be done more quickly even though each student might solve different number and content questions. Therefore, in this research we develop CAT and IRT with 4 parameters based logistics model to evaluate the students’ ability. Some experiments conducted on 27 students with 50 number of questions were analyzed and compared with Classical Test Theory (CTT). The results indicate the system can be used as an alternative tool for evaluating the students’ ability.
Bajo’s Adventure: An effort to develop students computational thinking skills through mobile application
Authors: Kusnendar J , Prabawa H W , Rahmanda  
Published: November 2019

Abstract
The thought of the need for ownership and developing computational thinking skills emerged in the last few decades. This raises a number of other interesting derivative ideas, including how to teach and train computational thinking skills in students. This study aims to develop a game-based mobile application that can be used as a means to train computational thinking skills. In addition, this study also aims to identify the relationship between learning experiences that students get through the mobile application with some basic abilities in computational thinking, especially in terms of generalizing and algorithmic abilities. The data shows that the ability to think student computing can be formed and even improved in a relatively short period of time through media that is discerning to teach and train computational thinking skills. Nevertheless, the teacher’s role is still needed that is pedagogically able to facilitate the students deadlock in connecting what students have gained through the media with the concepts they want to teach.
An investigation of blended learning in at-home and in-school education of information ethics using tablet PCs
Authors: Sasaki H 
Published: November 2019

Abstract
The goal of this study is to develop a blended learning in at-home and in-school education of information ethics using tablet PCs and to evaluate the effectiveness of the lesson. Information technology such as the internet and smart phones in society has been progressing speedily. On the other hand, the negative effects of information technology, such as bullying and calumniation on social media have become social problems for more than twenty years. The education of information ethics has been introduced to schools in order to solve these problems in Japan. However, the problems haven’t been solved yet. Then, the national curriculum standards of elementary and junior high schools stated that the education of information ethics should be brought into the moral instruction in 2008. This requested us to develop a teaching method of moral instruction to educate students in information ethics. Therefore, the theoretical framework of the information ethics was set up, and I established a new judgment model of information ethics. I assumed that ambivalence, the state of contradictory feeling or emotion, exists behind the three types of knowledge and that ambivalence affects inappropriate judgment related to information ethics. Therefore, a teaching method with the aim of overcoming ambivalence should be developed using the structural method. From now on, cooperation with parents is essential to enhance the education of information ethics. I conceived something available to help cooperation with parents. Recently tablet PCs have been brought into the school. Then, I devised the procedure of blended learning. As a result, I developed three steps: 1) Students learn the introduction part of moral instruction in school and learn how to use the tablet PCs. 2) Students take the tablet PCs home and discuss the learning material on the tablet PCs with their parents. 3) Students learn the conclusion part of moral instruction again in school. In order to assess the effectiveness of the lesson, blended learning was practiced on 4rd grade elementary school students. As a result, it was suggested that blended learning was fairly effective in educating the students in information ethics.
The use of fuzzy in determining the potential entrepreneur
Authors: Deliana Y , Djuendah E , Suminartika E , Wulandari E , Trimo L , Tuhpawana  , Kusnadi  
Published: November 2019

Abstract
Unemployment in Indonesia both in the village and in the city from year to year increase, because the number of workers who are not absorbed, and entrepreneurship is one solution. There are so many traits an entrepreneur must have to be successful, including risk taker, persuader, ambitious, skill, lead, and others. This entrepreneurial group has several criteria. Entrepreneur with high potential for success is to have eight qualities: reliable, broad network, training, serving, managing, experiencing, seeing opportunities and cooperation. Entrepreneurs who have the potential to succeed have five of the eight properties and low entrepreneurship has three of the eight properties. This research was conducted in Surian Subdistrict of Sumedang District with sample of 105 people taken at random. The purpose of this study is to determine entrepreneurship that has the potential for high success, medium and low. In addition to determining the constraints of becoming a successful entrepreneur. The results of research useful for aspiring entrepreneurs is to detect the odds of success in business, so it can determine the direction in developing the potential it has.
The contribution of friendly character through cooperative-learning model with example and non-example types (CLM-ENET) on energy concepts
Authors: Ningsih S S , Mustadi A 
Published: November 2019

Abstract
In the Curriculum 2013, character education is likely needed by primary students to realise the benefits of the 2045 gold generation, including 4C competencies; one of which is communication skills. The aim of the research is to analyse the contribution of cooperative learning model with example and non-example types (CLM-ENET) in the primary education level on the energy concepts. The research has already been conducted through Classroom-Action Research (CAR) in the one of fourth-grade students of Sleman, Yogyakarta. The data has been collected by using observation, interview and documentation techniques. The quantitative and qualitative data have ever been analysed via descriptive statistics and students responses regarding to the friendly characters. The research result reports that the implementation of CLM-ENET is able to improve students’ friendly characters on energy concept. Students have already given and listened to opinions in their classroom-discussions when they discussed and exemplified about energy conceptions and the formed-changing of energy. In conclusion, the implementation of CLM-ENET is able to improve primary students’ friendly-characters on energy concepts.
Mathematical connections process for elementary school students in problem solving of statistics
Authors: Astari E , Marsigit  
Published: November 2019

Abstract
This study belongs to the descriptive qualitative research which aims to describe the process of mathematics connections of grade 5 primary school students with high mathematical ability and low mathematical ability in problem solving of simple statistical. Subjects in this study were grade 5 students in SD Negeri 42 Pekanbaru each having different levels of mathematics ability, that is high and low. The process of mathematical connection in question is the student’s steps in connecting mathematics. Connection aspects observed in this research are (1) integrating information; (2) making connections within and across mathematical domains; (3) deciding which mathematical tools to use to solve problems; (4) solving nonroutine problems. Data analysis of the students’ mathematical connection ability use triangulation method technique that is test method and interview method. The results show that 5th grade students at SD Negeri 42 Pekanbaru were not familiar with the problem because overall the students mathematical connection skills were classified as low. So, it is very necessary to apply learning strategies that can improve student’s mathematical connection skills.
Instrument design of students self-regulated learning in statistics course
Authors: Cahyawati D , Wahyudin  , Prabawanto S 
Published: November 2019

Abstract
The purpose of this study was to obtain an appropriate and valid instrument for measuring students self-regulated learning in a statistics course. The first step was reviewing the definitions of self-regulated learning from some relevant references. The second was writing an instrument blueprint. The third was asking some expert judges to examine the instrument validity. The next step was compiling the statement items as the initial instrument design. Then the initial instrument was used to collect the self-regulated learning data from students in higher education. Those data were processed and analysed using exploratory factor analysis. The result was the final instrument which consists of 19-items with nine strategies that were grouped into five factors. The Factor-1 was fit into a goal, planning, and organizing strategies which had 7-items; The Factor-2 was fit into a structuring in physical and mental environment (3-items); The Factor-3 was fit into a seeking information (3-items); The Factor-4 was fit into a seeking assistance and rehearsing (3-items); and The Factor-5 was fit into a self-consequence and self-evaluation (2-items). This final instrument could be used as an appropriate and valid instrument for measuring students self-regulated learning in a statistics course in next study.
Improving Students’ mathematical creative thinking ability through problem-based learning
Authors: Supianti I I , Wahyudin  , Kartasasmita B G , Nurlaelah E 
Published: November 2019

Abstract
Creative thinking ability is one of the capabilities needed to face various situations and problems in life, students should have this ability. This study aims to know the effectiveness of the use of problem-based learning method in improving students’ creative thinking ability. This study used a mixed method research with explanatory sequential design. This method began with the use of quantitative methods by implementing pretest and posttest to find out the average normalized gains of the students’ creative ability, and then followed by interviews to find out more about their experience in using problem-based learning and its effectiveness in improving the ability of creative thinking. The result is an increase of students’ creative thinking ability by using problem-based learning model, with mean pretest rate (19.9) and posttest (71.4), and normalized gain score of 0.856, the increase is in high category. Interview results show that problem-based learning is useful and can accommodate creative thinking ability, as it also provides flexibility to improve other cognitive abilities.