bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effectivity of corrective formative evaluation on ability to understand geometric concepts
Authors: Zamzaili Z , Swita B 
Published: January 2021

Abstract
The aim of this study are to know the effectiveness of the corrective formative evaluation on the ability to understand geometric concepts of the students. This research is a quasi-experimental study with sample thirty two students. The data was analysed by using covariance analysis with students’ initial ability as covariate. The results of the study show corrective formative evaluation give effective contribution on the ability to understand geometric concepts with a contribution 44.5%. This study also indicates there is a significant effect of students’ initial ability as covariate on the ability to understand geometric concepts 35.2%. The average the ability to understand geometric concepts of the students taught with corrective formative evaluations is higher than conventional classes.
Improvement of student mathematics learning outcome on polyhedra topic by applying generative learning model in the class
Authors: Dianti A , Yensy N A , Rusdi R 
Published: January 2021

Abstract
Aiming of this research was to improve student learning outcome in mathematics Grade VIII SMP Negeri 11 Kota Bengkulu by applying Generative learning model in the class management. The design of this research was classroom action research with the steps were: planning, acting, observing and reflecting. The subject of this research was 32 students of Grade VIII B SMP Negeri 11 Kota Bengkulu on even semester academic year 2018/2019. Data collection was done by using step 4 application in student worksheet and cycle test sheet. The generative model steps in this research were step 1 preparation, step 2 focusing, step 3 challenge and step 4 application. Class management with applying generative learning model improved student learning outcome by: (1) step 1 preparation trained student to remember the topic; (2) step 2 focusing trained student to construct the concept by them self; (3) step 3 challenge trained student to solve the real problem using concept that they got; and (4) step 4 application trained student with the exercises. The average of student learning outcome improved from first cycle to third cycle were: 66,48; 74,70; 83,75 with classical learning outcomes were: 43,75%; 62,50%; 87,50%.
The correlation between learning interest and mathematics achievement in grade VII SMP PGRI Bengkulu
Authors: Karlina T , Saltifa P , Sari R K 
Published: January 2021

AbstractThis correlational study aims to determine the effect of learning interest forwards in mathematics achievement in Junior High School students PGRI Kota Bengkulu. The sampling in this study used a purposive sampling technique with consist12 student, grade VII, which is 5 boys and 7 girls. The data is collected by using a questionnaire and documentation. Then, the data is analysed using correlation analysis. Based on the results of the analysis, it is concluded that students’ interest in learning has a positive effect on mathematics achievement.
Improving conceptual understanding through inquiry learning by using a jigsaw method in abstract algebra subject
Authors: Sari W P , Haji S 
Published: January 2021

Abstract
This study was aimed at improving conceptual understanding through inquiry learning by using a jigsaw method. This cyclical classroom action research was conducted in four phases including planning, implementation, observation, and reflection. Thirty-seven bachelor degree students of semester 6 (even semester, academic year 2018-1019) of Mathematics Education, Faculty of Education and Teacher Training, University of Bengkulu were used as subjects of this study. Results showed that inquiry learning by using a jigsaw method improved students’ conceptual understanding. Average scores the students gained increased from 61.89 in cycle I to 78.37 in cycle II.
The exploration of the elementary geometry concepts based on Tabot culture in Bengkulu
Authors: Agusdianita N , Widada W , Afriani N H , Herawati H , Herawaty D , Nugroho K U Z 
Published: January 2021

Abstract
Geometry’s direct objects were abstract. It was a learning material that was difficult for elementary students. Therefore, learning was needed close to the minds and daily lives of students. One of them was “Tabot” Culture. That was the ethnomatematics approach. The purpose of this research was to explore elementary geometry concepts based on Tabot Culture. We apply an explorative-qualitative approach. The subjects of this study were the makers of the Tabot, elementary students, and elementary mathematics teachers. This was a needs analysis. Activities were carried out through direct observation, documentation, in-depth interviews and focus group discussions. The research instruments were anecdotal direct observation sheets, and interview guides. Data were analysed qualitatively. The results of the study found that the culture of Tabot provides reinforcement of student character that was obeying the principle, thinking logically, critically, working hard, curiosity, independence, confidence. The geometrical concepts that exist in the Tabot culture were the cube, the beam, the pyramid, the prism, the sphere and its elements. Also, understanding of two-dimensional figure. We conclude that Bengkulu Tabot culture can be used as a starting-point for learning the achievement of geometrical concepts and strengthening student character.
Level of student understanding in solving geometry problems based on taxonomy of SOLO (Structure of Observed Learning Outcomes)
Authors: Agustinsa R , Muchlis E E , Maizora S 
Published: January 2021

Abstract
This research aimed to determine and classify the level of student understanding in solving geometry problems with taxonomy of SOLO (Structure of Observed Learning Outcomes). The material been examined was the geometry of planes and spaces. This research was a type of qualitative research conducted by the method of think loud. The research results were: 55% of students had an understanding that was at a multistructural level with indicators that have been able to use some concepts that was correct but not yet right in terms of linking concepts and 39% of students have been able to use a correct concept (unistructural level). Then about 5% of students have an understanding at the relational level that have been able to use some correct concepts and connect them, whereas 1% of students have a level of prestructural understanding. Based on the research results, it can be concluded that levels of student understanding in solving geometry problems are various from pre-structural level until relational level.
The development of test instruments to support students’ ability on mathematical learning evaluation course
Authors: Susanta A , Susanto E 
Published: January 2021

AbstractThe purpose of this study was to develop mathematics test instruments for secondary school students that is valid, reliable, a good discrimination, and a good level of difficulty. This research was a research and development using the stages of instrument development, namely: (1) compiling test instrument specifications, (2) writing test instruments, (3) examining test instruments, (4) conducting test, (5) analyzing items, (6) fixing the test. The instruments used in this study consisted of expert validation sheets with index Aiken analyze and student response sheets. The subject in this study was thirty secondary students of the Mathematics Education Study Program, Faculty of Education, University of Bengkulu who took mathematical learning evaluation course. The results of the research showed that in developing of the instruments obtained were 160 items of multiple choice test for seventh and eighth grade. The results of the analysis showed that all test instruments were reliable with a high category, good discrimination, and easy to medium difficulty level. The results of student responses in preparing test instruments showed high criteria with an average score 49.70.
Inculcation of the values of character education in the process of learning mathematics in grade VII SMP 10 Bengkulu City
Authors: Anggraeni N A , Komalasari R 
Published: January 2021

Abstract
This study is intended to solve the problem of how to instill the values of character education in the background with the rise of people who begin to do dishonorable acts, such as the law to moral degredation, and therefore the need for the integration of the values of character education. These problems were discussed through a field study conducted at SMP 10 Bengkulu City. Research data obtained by free interviews and observations. All data were analyzed using a phenomenological approach and descriptive analysis using induction logic, deduction and reflection. The results showed that the values of character education contained in grade VII mathematics materials included the values of religious character, good personality, social care, honesty and hard work. The way the teacher instills the values of these characters is by getting used to reading prayers before and after learning, encouraging learning and giving questions with a level of difficulty that gives challenges to students.
Design speed bump piezoelectric used pressure method (case study Jambi University gate portal)
Authors: Pathoni H , Pratiwi D , Fuady S , Noval M 
Published: January 2021

Abstract
Speed bump was a device for producing mechanical energy from a motor run through it. Piezoelectric was a device for producing electrical voltage that sourced from the energy pressed the piezoelectric. This research used speed bump as a source of mechanical energy which pressed piezoelectric for producing voltage. The results showed that piezoelectric speed bumps producing varied voltages. The voltage resulted that varying the highest voltage generated around 1 - 1.8 volts. In the other research the resulting voltage was not so high. It depended on many factors finding in the field.
Developing mastery of electricity and magnetic concept for pre-service physics teacher
Authors: Hakim L , Hakim A , Sulistyowati R , Lefudin L 
Published: January 2021

Abstract
The mastery of concept of electricity and magnetic is ability to understand the concepts of electricity and magnetic both in theory and practice. The concept of electricity and magnetic is an important concept for students in dealing with real problems in daily life. The development of ICT in learning provides many opportunities for educators to integrate electricity and magnetic concepts in learning. The purpose research is to develop mastery of the concept electricity and magnetism pre-service physics teacher by using ICT. Utilization ICT in learning can helps students to understand abstract concepts and increase student interest in learning. The method used in this study is an experimental research design with pre-test-post-test control group design. The participants in this study were the students of physics education at a private university in the city of Palembang. The research sample is the students in 3rd semester of physics education programs. The sampling technique used is purposive sampling. The instrument used was a concept mastery test consisting of 45 multiple-choice questions. The results showed that the mastery of the concept of magnetic electricity for students who received ICT-based learning was significantly greater than the mastery of the concepts of students who got traditional learning.
The difference in the guided inquiry model towards critical thinking skills in physics subject at SMAN 3 Kota Bengkulu
Authors: Medriati R , Hamdani D , Harjilah N 
Published: January 2021

Abstract
This study aims to describe whether there are significant differences in students taught with guided inquiry models towards critical thinking skills in physics subjects. The research sample was students of class X MIPA 3 and X MIPA 4 in SMA Negeri 3 Kota Bengkulu even semester 2018/2019 on the concept of work and energy. This research is a study of quasi experiment with a design of non-equivalent control group design. For testing data used instruments of critical thinking skills, which are in the form of essays totalling six questions. The results of the descriptive analysis, the average score of critical thinking skills increased in the experimental class with guided inquiry models and control classes with the direct instruction model. The result of inferential analysis shows that guided inquiry learning has a significant effect on students critical thinking skills. So it can be concluded that there are significant differences in learning with guided inquiry models towards critical thinking skills in physics subjects’ students of SMA N 3 Bengkulu city.
Analysis of student responses toward ethnoscience based Direct Instruction learning model in learning physics applying Rasch Model Approach
Authors: Risdianto E , Dinissjah M J , Nirwana N , Sutarno M , Putri D H 
Published: January 2021

AbstractThe problem examined in this study was how students respond to learning with theDirect Instruction. Ethnoscience-based that connected the intensity and intensity of material with Bengkulu’s dol music in teaching and learning activities. The aim of the researchers was to analyze students’ responses to learning with the modelDirect Instructionbased on ethnoscience to find out whether the responses given by students were positive or negative. An analysis data using Rasch Model Approach. Student responses are said to be positive if students feel happy about the learning component used, the learning component used is new, students are interested in implementing the same learning in subsequent learning and students are interested in the learning components used. The results of the research obtained were 92% of students gave a positive response to learning with the modelDirect Instructionbased on ethnosains. In other words, students are happy with the components of learning that are applied.
The effect of inquiry-based science learning on students’ level of thinking
Authors: Damopolii I , Nusantari E , Kristianto D D , Nunaki J H , Kandowangko N Y 
Published: January 2021

Abstract
Student thinking in biology lessons has become the main focus of several recent studies. The research aims to reveal: (1) Differences in student level of thinking before and after the implementation of inquiry-based science learning; (2) Differences in student level of thinking before and after the application of conventional learning; and (3) differences in student level of thinking between students taught by inquiry-based science learning and conventional learning. Samples were 63 students in class X IPA SMA Negeri 2 Fakfak, West Papua. A total of 30 students in the experimental group, and 33 students in the control group. Data were collected using 9 items of students’ thinking ability test. To measure the thinking level of students, rubric 5 levels of SOLO Taxonomy are used. Data analysis were used Wilcoxon test and Mann Whitney Test. The results of the analysis show that 29 students experienced an increase and 1 student remained at the level of thinking in inquiry-based science learning class (p < .05), 14 students experienced an increase and 19 students remained at the level of thinking in the conventional learning class (p < .05), and students who taught inquiry science learning has a better level of thinking compared to students in conventional learning (p < .05). We conclude that inquiry-based science learning has a better effect on the level of thinking of students than conventional learning. Going forward, to improve students’ thinking skills, teachers can use inquiry-based science learning.
The effect of android-based earthquake game toward Bengkulu City elementary school student’s knowledge about earthquake disaster preparedness
Authors: Winarni E W , Purwandari E P , Wachidi W 
Published: January 2021

Abstract
Earthquake is one of the frequent natural disasters which is still unpredictable. Nevertheless, we can always be able to reduce and prevent its negative impacts by implementing earthquake disaster preparedness. This study aimed to examine the effect of an android-based earthquake game on Bengkulu City elementary school student’s knowledge about earthquake disaster preparedness. The subjects were fifth-grade elementary school students in Bengkulu City. The quasi-experiment research was conducted using Matching – Only Pre-test Post-test Control Group Design. Android-based earthquake game software used as a treatment in the experiment group. Data were collected using a multiple-choice test sheet instrument. The result found that the experiment group means knowledge about earthquake disaster preparedness was higher than the control group. It concluded that there was a significant difference between experiment group and control group. The advantages and limitations of the android-based earthquake game and its implication to earthquake disaster preparedness education discussed
Analysis antifungal compounds produced by endophytic bacteria from oil plant using Bioautography
Authors: Candrawati E , Rupaedah B , Sumpono S , Sundaryono A 
Published: January 2021

Abstract
This study was undertaken to evaluate the antifungal activities of the bioactive compounds poduced by endophytic bacteria isolated from oil palm plant using TLC-Bioautography. Antifungal compounds used in this study have been extracted from potential endophytic bacteria of previous studies using ethyl acetate solvent. The antifungal compounds was tested for its activity against the pathogenic fungus Fusarium oxysporum f.sp. by using TLC-Bioautography method. The results showed that there are 3 spots on the TLC plate for samples of B11 antifungal compound with an incubation time of 54 hours and B11 with an incubation time of 24 hours. Observation of bioautographic antifungal activity test showed the presence of inhibition zones with the largest average percentage given by B11 with an incubation time of 24 hours is 11.59%. The inhibition zone provided B11 with an incubation time of 54 hours is only 11.08%.
Analysis of the natural electric field at different sea depths
Authors: Yu P. , Zhang J.W. , Cheng J.F. , Jiang R.X. 
Published: January 2021

The natural electric field at the depth of 0 ∼ 1500 m in high seas of South China Sea is obtained by using a new type of measuring device. The electric field data in the 0.01 ∼ 0.5 Hz and 0.5 ∼ 30 Hz frequency range are analyzed respectively. The results show that the induced electric field generated by the surface wave (about 0.14 Hz in the experiment) is obvious at the depth of 50 m but can be ignored at the depth greater than 100 m. When the depth increases from 50 m to 1500 m, the peak-to-peak value of the natural electric field gradually decreases. At the depth of 1000 m, the peak-to-peak values are 0.04 ∼ 0.08 μV/m in the 0.01 ∼ 0.5 Hz range, and 0.07 ∼ 0.1 μV/m in the 0.5 ∼ 30 Hz range. At last, the natural electric field in coastal water near Sanya City, where the water depth is 15 m, is measured by means of a sinking device. The results show that the peak-to-peak values are about 2 ∼ 4 μV/m in the 0.01 ∼ 0.5 Hz range and 2 μV/m in the 0.5 ∼ 30 Hz range. By comparing the natural electric field in high seas with that of coastal water, we find the latter has a larger peak-to-peak value at nearly the same water depth. In addition, line spectrum noise often occurs in coastal water, while it is rarely observed in high seas when the water depth is more than 50 m.
Does carbon pricing reduce emissions? A review of ex-post analyses
Authors: Green Jessica F 
Published: January 2021

Abstract
Carbon pricing has been hailed as an essential component of any sensible climate policy. Internalize the externalities, the logic goes, and polluters will change their behavior. The theory is elegant, but has carbon pricing worked in practice? Despite a voluminous literature on the topic, there are surprisingly few works that conduct an ex-post analysis, examining how carbon pricing has actually performed. This paper provides a meta-review of ex-post quantitative evaluations of carbon pricing policies around the world since 1990. Four findings stand out. First, though carbon pricing has dominated many political discussions of climate change, only 37 studies assess the actual effects of the policy on emissions reductions, and the vast majority of these are focused on Europe. Second, the majority of studies suggest that the aggregate reductions from carbon pricing on emissions are limited—generally between 0% and 2% per year. However, there is considerable variation across sectors. Third, in general, carbon taxes perform better than emissions trading schemes (ETSs). Finally, studies of the EU-ETS, the oldest ETS, indicate limited average annual reductions—ranging from 0% to 1.5% per annum. For comparison, the IPCC states that emissions must fall by 45% below 2010 levels by 2030 in order to limit warming to 1.5 °C—the goal set by the Paris Agreement (Intergovernmental Panel on Climate Change 2018). Overall, the evidence indicates that carbon pricing has a limited impact on emissions.
Risk and vulnerability of Mongolian grasslands under climate change
Authors: Nandintsetseg Banzragch , Boldgiv Bazartseren , Chang Jinfeng , Ciais Philippe , Davaanyam Enkhbaatar , Batbold Altangerel , Bat-Oyun Tserenpurev , Stenseth Nils Chr. 
Published: January 2021

Abstract
Climate change is projected to increase the aridity of semi-arid ecosystems, including Mongolian grasslands (MG), which provide ecosystem services that support food supply and pastoralist lifestyle. Here, we conducted a grid-scale (0.5° × 0.5°) probabilistic risk assessment of MG under climate change for 40 years (1976–2015) based on probability theory. We evaluated changes of risk (impacts) and vulnerability of MG to drought between the recent two decades R20 = 1996–2015 and the previous two decades P20 = 1976–1995. The risk is quantified as the product of the probability of hazardous drought and ecosystem vulnerability. The probability of hazardous drought is defined from the Standardized Precipitation–Evapotranspiration Index. Vulnerability is defined as the expected differences of key ecosystem variables between years with and without hazardous conditions. The ecosystem variables are productivity (peak aboveground biomass, net primary productivity, and leaf area index) and root-zone plant-available soil moisture, simulated with a process-based vegetation model Organizing Carbon and Hydrology in Dynamic Ecosystems-Grassland Management validated with field observations of biomass and soil moisture. Results reveal that MG experienced more frequent hazardous droughts with rapid warming and slight drying during R20 aggravated by ever-increasing grazing intensity (34% compared to P20), which resulted in a reduction in soil water availability and grassland productivity, particularly in northeastern areas (20%–65%). The risk of drought to productivity increased by 10% between P20 and R20 over extended areas, particularly in northcentral and northeast Mongolia. The increase in the risk to MG was mainly caused by climate change-induced increase in the probability of hazardous drought and, to a lesser extent, by the increasing vulnerability. Recent droughts modify the risk to grasslands, particularly in northcentral and northeast Mongolia, suggesting that these regions need strategic management for both adaptation and ecosystem conservation to cope with climate change impacts.