bluuebunny/crossref_metadata_2025_split huggingface dataset:
Student discussion skill activities on microbiology courses through lesson study
Authors: Murniati N , Susilo H , Listyorini D , Irwandi I 
Published: January 2021

Abstract
Lesson study is an educator professional development program through collaborative and continuous learning based on the principles of collegiality and mutual learning. This lesson study activity aims to increase student discussion activities in the Microblogy course at the Teacher Training and Education Faculty Biology Study Program at Muhammadiyah University of Bengkulu. This research was a classroom action research using 4 cycles. It used a qualitative design with a problem-based approach. The lesson study implementation phase was planning (Plan), implementing learning (Do) and Reflection (See). The topics chosen in the lesson study activities were (1) Bacteria (2) Fungi, (3) Protozoa, and (4) Viruses. The data collection used observation sheet observation of student discussion activities through lesson study activities. The data collected were then analyzed by descriptive qualitative. The results of lesson study activities showed the increasing in skills activity to student discussions in microbiology courses at the Teacher Training and Education Faculty of Muhammadiyah University of Bengkulu. Continuous implementation of lesson study in the lecture process improved the professionalism of lecturers. Along with the increase in lecturer professionalism, it had an impact on the effectiveness of learning activities and improving the quality of education as a whole.
Application of Plackett-Burman and Box-Behnken experimental designs in differential voltammetry for determining Gadolinium concentration
Authors: Wyantuti S , Harahap F W , Hartati Y W , Firdaus M L 
Published: January 2021

Abstract
Middle group rare earth elements, such as Gadolinium, have an important role in a variety of applications, mostly used in high-tech industries because they have good mechanical strength. However, the rare earth elements of this middle group are difficult in their analysis because each element has almost the same physical and chemical properties. Gadolinium is one of the rare earth elements that have high paramagnetic properties. The purpose of this study was to determine the gadolinium content by differential pulse voltammetry using an experimental design. Plackett-Burman experimental design was used to obtain selected factors that have positive results to the method. A total of 11 factors that have the potential as the main influence in this study were selected at the highest (+) and lowest (-) levels, and then measured 12 times according to the Plackett-Burman experimental design. Furthermore, optimization was carried out with the Box-Behnken experimental design by performing 15 measurements to obtain the optimum conditions for each factor. Response data was processed and obtained factors with optimum conditions, deposition potential of -2.0 V, modulation of the amplitude of 0.1 V, and a deposition time of 120 seconds. The detection limit and the quantitation limit were 3.97 mg/L and 10.71 mg/L, respectively. The recovery of Gadolinium was 95%, which is satisfactory.
Green route of silver nanoparticles synthesis using watermelon (Citrullus lanatus) fruit extract for mercury ions detection
Authors: Firdaus M L , Apriyoanda H , Elvinawati E , Rahmidar L , Astuti A P , Swistoro E , Sundaryono A 
Published: January 2021

Abstract
In this paper, we report the green synthesis of silver nanoparticles using a reductant of fruit extract of watermelon (Citrullus lanatus), and its application for mercury ions detection. Silver nanoparticles were made from small amount of silver nitrate, assisted with sunlight irradiation. After 30 minutes of irradiation, the yellowish-brown silver nanoparticles were formed with peak absorbance at 420 nm wavelength. The formed silver nanoparticles were then tested to various alkaline, alkaline earth and transition metals. Most of the metals has no effect to the silver nanoparticles except for mercury ions that change the color of silver nanoparticles to colorless. Therefore, silver nanoparticles are selective to detect mercury ions in aqueous solution. Compared to the reference method, the developed colorimetry method for mercury ions detection was accurate up to 99.38%.
Innovative chemistry education: An alternative course models in the disruption era
Authors: Liliasari S , Amsad L N , Wahyudi A 
Published: January 2021

Abstract
In the era of IR 4.0 and society 5.0 is existed the global disruptive in every aspect of human life even in the education world. This study literally stated the innovation course models in chemistry education. The innovative learning models directed to be able to develop the ability of students’ use of the ICT and work together and communicate with one another in chemistry learning, especially in laboratory activities. The study of Biochemistry showed that laboratory course should be done before the theoretical course. Study of LPBSOURA in Organic Synthesis course using a retrosynthetic approach shows that students applied their concept mastery of several courses related before, green chemistry and skilful in software application in predicting target molecule. The studies also show that innovative learning models could improve students’ generic science, creative and critical thinking skills, using project based learning that can increase students’ thinking and skills to prepare them to face this era.
Problem solving learning model using video application
Authors: Handayani D , Alperi M 
Published: January 2021

Abstract
Lecturer play an important role in the process of planning the learning activities, one of them is in the selection of learning model. This research aims to improve the student activities and learning outcomes in the course of chemistry food materials using problem solving learning models integrated with video media. This research was a classroom action research, which consists of 3 cycles. The participants were students of the chemistry education study program who enrol chemistry food materials courses in the odd semester of academic year 2017/2018, totally 35 people. The data analysis technique is by calculating the average value and classical learning completeness. The data were gathered from test in the end of every cycle. It was found that the student’s ability in learning process improved after the implementation of Problem Solving model. It could be seen in the improvement of average score for each test, from 78,81 in cycle I, 80,18 in cycle II to 85,69 in cycle III. In addition, classically learning completeness of students also improved, from 82,86 % in cycle I, 88,57 in cycle II to 100 % in cycle III.
The development of Chemistry Teaching Guide (CTG) on electrolyte solution and redox reaction based on scientific inquiry
Authors: Solikhin F , Sari L P 
Published: January 2021

Abstract
The purpose of this study is to develop a chemistry teaching guide (CTG) for electrolyte solution and redox reaction based on scientific inquiry and find out its quality through the assessment of high school chemistry teachers. The choice of electrolyte solution and redox reaction material because this material is material that is easily developed into a scientific inquiry-based activity. This is research and development (R&D). The CTG was assessed by high school chemistry teachers who had taught the material for at least 2 years. The quality of the results of development is reviewed from the 5 assessment components, namely content, presentation, language, implementation, and display. The results of this study are that CTG based on scientific inquiry has been developed. The quality of the CTG is Very Good in terms of the results of the chemistry teachers assessment. Thus, CTG is feasible to be used by teachers as a guide in learning electrolyte solution and redox reactions based on scientific inquiry.
Stoichiometry using guided inquiry model for enhancing creative thinking skills
Authors: Amida N , Nurhamidah N 
Published: January 2021

Abstract
This study aims to enhance creative thinking skills of students using guided inquiry model trough of Stoichiometry. This study used quasi-experimental methods, with pretest-postest non equivalent control group design. Subjects of this study were biology students enrolled in basic chemistry, consist of 35 students in experimental class and 35 students in control class. Instrument in this study were essay test that involves 3 indicators of creative thinking skills (i.e. fluency, flexibility, and elaboration) and also student worksheets. The results showed that Stoichiometry using guided inquiry model have been enhance for creative thinking skills in medium category with a value of <g> 0.48.
Dynamic programming for an optimization of production plan
Authors: Rafflesia U , Widodo F H , Angraini T 
Published: January 2021

Abstract
This study discusses the optimization of production plans in a convection company using a dynamic programming. Fluctuating demand requires the convection company to implement a strategy to control the production process so that there are no shortages or excess products. The purpose of this study is to find out the total minimum costs in preparation of school uniform production plans for the next one year using dynamic programming. The initial steps used in the production planning is predicting the demand of product from average demand in the previous 3-year period. The implementation of dynamic programming divides the problem into 12 stages due to monthly periods for one year. The results of this study obtained the total minimum cost of production plan for the next 1 year. The production plan through dynamic programming is able to maintain the existence of a convection company for the next few years.
Augmented Reality assisted by GeoGebra 3-D for geometry learning
Authors: Widada W , Herawaty D , Nugroho K U Z , Anggoro A F D 
Published: January 2021

Abstract
Geometry becomes a difficult subject for students. The abstract object was one of the factors. Therefore, more concrete learning media are needed. One of them was augmented reality assisted by GeoGebra. The purpose of this study was to determine the ability to understand the geometrical concepts of high school students through augmented reality learning assisted by GeoGebra. Treatment was given to students through learning using GeoGebra-assisted augmented reality. This was a quasi-experimental study with a pre-test post-test control group design. This research instrument was a test of the ability to understand the concept of geometry. The test was used to measure students’ initial abilities, and this was referred to as a covariate. Also, to measure the ability to understand concepts after students follow augmented reality learning assisted by GeoGebra. Data were analyzed by covariate analysis (ANCOVA). The results of this study were F = Fo (A) = 9,150 with p-value = 0,000 <0,005. That means, there are differences in the ability to understand the concept of geometry between those taught with augmented reality which is assisted by GeoGebra and conventional learning. Other results show that t = 6.723 with p-value = 0.000 <0.05. This shows that the ability to understand the geometry concepts of students taught with augmented reality assisted by GeoGebra was higher than students who were taught conventionally after controlling for covariates. The conclusion was that the ability to understand the concepts of geometry through GeoGebra-assisted augmented reality learning was better than students taught with ordinary learning.
Potential effects of developing student worksheets based on the context of Lubuklinggau main subject in class VII
Authors: Adha I , Refianti R 
Published: January 2021

Abstract
The purpose of this study is to produce student worksheets (LKS) which have a potential effect on student learning outcomes. The subjects of the study were students of SMP N 8 Lubuklinggau in class VII.D in the 2019/2020 school year. The approach used in the development of LKS is using the Indonesian realistic mathematics approach (PMRI). The method used in this research is research and development (R&D) using a 4-D model that has been modified to become 3-D. Which consists of defining, designing and developing. The potential effects of worksheets developed can be seen from the activities of students in working on problems in worksheets, where students more easily understand the mathematical concepts contained in worksheets. Of the 33 students who were the subjects of the study, 19 were in the excellent category or around 57.6%. Whereas in good category there are 7 people or around 21.2%, enough categories are obtained by 5 people or around 15.2% and less categories are obtained by 2 people or about 6%. Based on the results of these percentages it can be concluded that the worksheet designed has a potential effect on student learning outcomes.
Implementation of realistic mathematics education learning model with outdoor approach in elementary school: Study of presenting and processing data
Authors: Haji S , Yumiati Y 
Published: January 2021

Abstract
This research was aimed to implement Realistic Mathematics Education learning model with outdoor approach in elementary school at Bengkulu. The method used in this research was quasi-experiment. The research design used was pre-test post-test group design. Sample of the research were 94 students taken from 5th grade elementary students in Bengkulu. The instrument used about presenting and processing data was 4 items. Data was analysed qualitatively and quantitatively. The result from the research shows that Realistic Mathematics Education learning model with outdoor approach in elementary school students may improve student’s understanding ability about mathematics concept for high level school by 0.45; for medium level school by 0.41; and for low level school by 0.27. Meanwhile, the achievement of students’ mathematics concept understanding in elementary school for high level school is 77.31; for medium level school is 73.92; and for low level school is 57.86. The implication of research result is that the use of Realistic Mathematics Education learning model with outdoor approach is needed to improve the mathematics concept understanding of elementary school students.
Analysis of mathematics textbook use: An argument for combining horizontal, vertical, and contextual analyses
Authors: Rahimah D , Visnovska J 
Published: January 2021

Abstract
This paper contributes to a larger endeavour of understanding how mathematics textbooks are used in classrooms and what shapes the specific forms of their use. Three types of mathematics textbook analysis have been previously identified, namely, horizontal, vertical, and contextual analysis. Based on literature review, we discuss how these three types of analysis can be usefully combined, and explain why contextual analysis, where data on textbook use is collected in classrooms, provides the most revealing insights. We argue that because of its relevance for textbook design as well as for teacher professional development, researchers should consider including the contextual analysis when analysing textbooks.
The multiple intelligence optimize activity using discovery learning models that improve learning outcome in trigonometry course
Authors: Muchlis E E , Maizora S , Rahimah D 
Published: January 2021

Abstract
The aim of this research was to describe the Multiple Intelligence optimize activity using discovery learning models that improve learning outcome in trigonometry class. The type of this research was classroom action research, with the steps were planning, implementing, observing and reflecting. The subject of this research was students of Mathematics Education who took trigonometry class in the first semester of the academic year 2017/2018. The instrument used was a test of Multiple Intelligence, observation sheet and learning outcome test. The results of the analysis of activity observation sheet with discovery learning and Multiple Intelligence tests obtained: 1). Linguistic intelligence was optimized with the discussions and respond to the problem, 2) Mathematical-logical and intrapersonal intelligence optimized through the activities of verification, 3) musical intelligence was optimized through listening to music in the application of the concepts activity, 4) Space-visually intelligence optimized through working on the problems in the application concept activity, 5) interpersonal intelligence was optimized through data collection activity occurred cooperation in solving the problems 6) Space-spatial intelligence could optimized directly by expressing the concept after making the observation and manipulation of props. The average of learning outcome increased in every cycles, the average of learning outcome in the 1st cycle was 69,92. The average of learning outcome in the 2st cycle increased to 78,45. The average of learning outcome in the 2st cycle increased to 85,48.
The ability to solve mathematical problems through realistic mathematics learning based on ethnomathematics
Authors: Lubis A N M T , Widada W , Herawaty D , Nugroho K U Z , Anggoro A F D 
Published: January 2021

Abstract
Problem-solving is one of the goals of mathematics learning. Ethnomimetic-based realistic mathematics learning is learning with starting-point contextual problems that are close to students’ minds. This study aims to determine the effect of ethnomathematics-oriented realistic mathematics learning on problem-solving abilities. That is a type of quasi-experimental research. The study design was a non-equivalent control group. The population is SMA N 2 Kota Bengkulu in 2019. The sample of this study was 68 students from Class X MIPA A and X MIPA D. The research instrument was a test of problem-solving skills. Data were collected through tests and analysed by covariate analysis. The results of this study are that realistic mathematics learning oriented to ethnomathematics has a positive effect on the ability to solve. The conclusion is that realistic mathematics learning with ethnomathematics orientation can improve mathematical problem-solving skills for secondary school students. We suggest that mathematics teachers can develop realistic mathematics learning tools with ethnomathematics as a starting point for learning.
Development of student worksheets based on guided inquiry for grade VIII SMP 22 Kota Bengkulu cube and cuboid material
Authors: Lestari W P , Syafri F S , Saltifa P 
Published: January 2021

Abstract
The purpose of this research development is to develop guided inquiry-based worksheets on the material of Cubes and Beams in Class VIII SMP Negeri 22. This research uses the Plomp development research model including the initial investigation phase (preliminary research), the development or prototype phase (development or prototyping phase), and the research phase (assessment phase). The LKS product test results show that the LKS developed on the material of Cubes and Beams are valid, effective and practical. So it can be concluded that this worksheet can be used in learning mathematics.
Metal incorporated Philippine Abaca fiber (Manila hemp) as a potential novel filter for water disinfection
Authors: Garcia K A , G Peroja K-A , Tuberon NA L , Cambiador CJ B , Cid-Andres A P 
Published: January 2021

Abstract
The contamination of water sources by pathogenic bacteria poses a threat both in the environment and in human health. The incorporation of metal nanoparticles in polymer matrix which is abundantly available in a country can be improved to enhance its antimicrobial property. This study was focused on the development of a novel antibacterial water filter from synthesized silver-copper nanoparticles (Ag-CuNPs) incorporated into Philippine abaca fiber (Manila Hemp). Pre-treatment method and determination of adsorption capacity of abaca fiber towards metal ions, Ag+ and Cu2+ were done prior to synthesis of Ag, Cu and Ag-Cu nanocomposites. Alkali treatment of the fiber confirms OH, C-O and C=O of a cellulose, pectin and lignin in the FTIR analysis. These groups effectively altered the nature of the abaca fiber to hydrophobic, thus, increasing its adsorption capacity up to 80%. Morphological and structural properties of the formed nanoparticles were confirmed using scanning electron microscopy (SEM) revealing polymeric matrices of the fiber in the particle size of 80 nm – 100nm. UV-Vis spectra revealed a broadening of the absorption spectra of a bimetallic Ag-Cu nanoparticles at 410 nm. The antimicrobial assay results revealed promising synergism of the combined silver and copper nanoparticles against both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacterial strains in synthetically prepared water. Also, a relatively proximate bactericidal efficiency was attained between the CuNPs and Ag-CuNPs abaca fiber composites. The developed Ag-CuNPs abaca fiber composite can act as novel antibacterial water filter for water disinfection.
The feasibility of electrostatic teaching material: Oriented to conceptual understanding
Authors: Maison M , Alrizal A , Wardana R W , Natalia U 
Published: January 2021

Abstract
Conceptual understanding is one of the important things in physics learning. Many factors affected the conceptual understanding of students; one of them was the book. Based on the data from the implementation of a questionnaire on junior high school students, their learning resources (books, etc.) have not been able to help them understand many concepts of physics including the concepts of electrostatics.Some abstract concepts in physics make them more difficult to understand physics. This study aimed to develop electrostatic teaching material-oriented to conceptual understanding for junior high school students. We use the ADDIE model, i.e., analyze, design, development, implementation, and evaluation. The result of this study shows that the teaching material is feasible to use in learning based on the feedback from validators.
Identification of debriefing 21 st century skills on aspects of critical thinking skills and communication skills in Bengkulu high school students in physics subjects
Authors: Hanicza Y , Putri D H , Hamdani D 
Published: January 2021

Abstract
This research was aimed (1) to identify category the 21st Century skills in the aspects of critical thinking skills of Bengkulu City High School students in physics subjects (2) to identify category the 21st Century skills on the aspects of communication skills of Bengkulu City High School students in physics subjects. The type of this research was Descriptive Research. The research samples was 90th grade Mathematics and Natural Sciences amounted to 90 students, MIPA class XI amounted to 90 students, and MIPA class XII amounted to 20 students from 3 high schools of Bengkulu City namely SMAN 2 of Bengkulu City, SMAN 4 of Bengkulu City, and SMAN 10 of Bengkulu City. The research was on 18 February - 22 March 2019. Data collection techniques used in this study were questionnaires, interviews, observation and documentation. The results of the data obtained were then triangulated and described with narrative text. Based on data analysis obtained debriefing 21st century skills on aspects of critical thinking skills students high school of Bengkulu City in physics subjects was in the sufficient category with an average score of 3.61 and obtained debriefing 21st Century skills on aspects of communication skills of Bengkulu City High School students in physics with an average score of 3.97 was in the good category.