Indonesia Conference Directory

Corresponding Author
Afrizal Mayub

Institutions
1Graduate School of Science Education, University of Bengkulu

Abstract
Writing describes the Design and Implementation of ICT-based E-learning programs that can be used for learning either through computer networks or personal computers (PCs) with CD ROMs. This research includes software engineering with methods of analysis, design, coding and evaluation. Based on the results of the study, it was obtained that the Design and Implementation of E-learning Program consisted of modules of material presentation, demo, analysis, examination, Practice test, Problem Answer and Help Module. The module can function as a learning tool that facilitates learning needs for learning activities that include reading, staring, watching, peeping, observing, simulating, demonstrating, answering questions, entering data, listening, tracing teaching materials, working on problems, and finding answers to problems

Keywords
Design, Implementation of e-learning program

Topic
Physics Education

Link: https://ifory.id/abstract/76WpaPhzqufN

Corresponding Author
Maison Maison

Institutions
a) Program Studi Pendidikan Fisika, Universitas Jambi
b) Program Studi Teknik Lingkungan, Universitas Jambi

Abstract
Abstract. Fluid mechanics and hydraulics subject is a subject that explains the concepts of the nature of fluids (liquids and gases) when stationary or moving, or when interacting with other fluids or solid objects. One of the courses in this subject related to hydraulics is about open channels. Many students have difficulties understanding this material and not able to describe abstract concepts because they were not doing experiments with the open channel. The purpose of this research is to develop hydraulic devices for open channels that can be used by students for practicum. The methods used to develop these tools are the study of literature, determination of design concepts, exploration of design scenarios, toolmaking, testing, evaluation, and improvement the tools. These tools are also equipped with a microcontroller to regulate water flow, slope of the water retaining plate to display hydraulic jumps and adjust the pump power. The test results show that the tool can provide consistent results, both from flowrate, weir overflow coefficient, and froude numbers.

Keywords
Hydraulics- tools, open channel model, flowrate, microcontroller

Topic
Physics

Link: https://ifory.id/abstract/76XrRpzuPG9f

Corresponding Author
Haerul Pathoni

Institutions
1Program Studi Pendidikan Fisika, Universitas Jambi, Jl. Jambi-Muara Bulian Km15 Mendalo Indah, Muara Jambi, Jambi, Indonesia, 36361
2Program Studi Teknik Elektro, Universitas Jambi, Jl. Tri Brata Mestong Pondok Meja Muara Jambi, Jambi Indonesia , 36364

Abstract
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.

Keywords
Speed Bump, piezoelectric, Voltage

Topic
Physics

Link: https://ifory.id/abstract/3eyjHuzL9bWq

Corresponding Author
Euis Nursaadah

Institutions
Universitas Bengkulu
Universitas Sultan Ageng Tirtayasa

Abstract
Chemistry learning needs an assessment to evaluate ways of students- thinking. One of them is a critical thinking skill test. The purpose of this study is designing domain-specific critical thinking skill on thermochemistry concept. Content Validity Ratio (CVR) and Confirmatory Factor Analysis (CFA) were evaluated to analysis the validity of the instrument. Cronbach-s Alpha were evaluated to analysis the reliability. Descriptive method was used as a research design. The participants of this study are 185 senior high school students in Cilegon-Banten-Indonesia. Data are obtained from expertise judgment, empirical test, and interview. The results showed that the quality of instruments of domain-specific critical thinking skills on thermochemistry concept based on CVR and CFA is 0,723 (good criteria). Cronbach-s Alpha test showed 0,652 (high criteria). It can be concluded that instrument is feasible to measure students- critical thinking skills on thermochemistry domain knowledge.

Keywords
Domain-Specific Critical Thinking Skills, Thermochemistry

Topic
Chemistry Education

Link: https://ifory.id/abstract/qRm6JhTPMjCY

Corresponding Author
Lukman Hakim

Institutions
a). Pendidikan Fisika Universitas PGRI Palembang Jl. A. Yani 9/10 ulu palembang
*lukmanhakim1976[at]gmail.com
b). Pendidikan Fisika Unmul Kampus Gn. Kelua, Samarinda

Abstract
Matery of electricity and magnetic concept students is ability to understand the concepts of electricity and magnetic both in theory and practice. The electricity and magnetic concept is an important concept for students in dealing with real problems in daily life. The development of ICT in learning provides broad opportunities for educators to integrate electricity and magnetic concept in learning. 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 pretest-posttest control group design. Participants involved in this study were the students of physics education at a private university in the city of Palembang. 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.

Keywords
mastery concept, electricity and magnetism, ict

Topic
Physics Education

Link: https://ifory.id/abstract/Yczx9rGEKJA3

Corresponding Author
ROSMIATI R

Institutions
1Program Studi Pendidikan IPA, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia
2 Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia
3Departemen Meteorologi, Institut Teknologi Bandung, Jl.Ganesha No. 10, Bandung 40132, Indonesia
4 Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia
5 Departemen Pendidikan Fisika, STKIP BIMA, Jl. Piere Tendean Kelurahan Mande, Kota Bima 84111, Indonesia

Abstract
The lack of community understanding of the predictions of the ocean climate is key to addressing the impacts and crisis of the ocean climate. The aims of this study is to explain the stages of ocean climate prediction skills using the ARIMA technique for pre service teacher students as beginner learners and provide solutions to build a conscious and responsive attitude to the ocean climate. The data used is Sea Surface Temperature (SST) Niǹo 3.4, analysis the stages of the Autoregressive Integrated Moving Average (ARIMA) model used MINITAB 16.0 and Microsof Excel that has been developed then applied by 3 respondents. Based on the results of the study, more detailed stages of the arima model and n 3 respondents both got a correlation value of 0.96 for Nino SST 3.4 original value and model value, correlation 0.92 for 1 year validation and correlation 0.99 ENSO prediction for 1 year (12 months) ahead. Thus the development of the ARIMA model stage is very effective to be used to predict climate such as ENSO events and other ocean climate phenomena.

Keywords
: Prediction Skills, Ocean Climate, Arima Model, Pre-Service Teacher

Topic
Physics Education

Link: https://ifory.id/abstract/6Bh2MpHLDyCd

Corresponding Author
Pani Aswin

Institutions
1 Program Pascasarjana Pendidikan IPA, Universitas Bengkulu, Jl. WR Supratman, Kota Bengkulu 38122, Indonesia

Abstract
The aims of this study is to develop conservation education learning based on the potential of natural resources in the city of Bengkulu to improve scientific writing skills. This type of research is research and development (analysis, design, development). The results of this study are 1) there is a coastal forest ecosystem that has vegetation types of trees, shrubs, bushes, grass, fungi, pteridopyta, bryodophyta, 2) mapping the potential of conservation areas as a source of learning for conservation education, 3) teaching materials for conservation education that facilitate students to develop scientific writing skills. The conclusion of this research is that conservation education lessons can be done by utilizing the potential of conservation areas.

Keywords
Conservation Education Learning, Potential of Natural Resources , Scientific Writing Skills

Topic
Science Education

Link: https://ifory.id/abstract/XWPeRvahuUk9

Corresponding Author
Wahyuni Puji Lestari

Institutions
Program Studi Tadris Matematika, Institut Agama Islam Negeri (IAIN) Bengkulu, Jl. Raden Fatah Pagar Dewa, Kota Bengkulu 65144, Indonesia.

Abstract
Abstract.The purpose of this research development is to develop guided inquiry-based worksheets on the material of Cubes and Beams in Class VII 22 State Junior High School. 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.

Keywords
Pengembangan LKS

Topic
Mathematics Education

Link: https://ifory.id/abstract/6rYfEmNU8jWu

Corresponding Author
Safira Permata Dewi

Institutions
1Program Studi Pendidikan Biologi, Universitas Sriwijaya

Abstract
Research on the development of higher order thinking problems based on problem solving on neural system material aims to produce higher order questions of thinking skills based on valid and reliable problem solving. The development of higher order problem thinking skills based on problem solving is based on the Anderson & Karthwohl and Polya frameworks. The problem developed is a multiple choice problem with five alternative answers. The evaluation process includes self-assessment, expert review, one-to-one and small groups. Readability questions are tested at the one-to-one stage. The results of the small group stages are then analyzed item items, namely item validity and item reliability. The validity of items is calculated using the product moment correlation, while the reliability of the questions is calculated using Anates 4.0. The results of the research conducted showed that the questions developed were valid and reliable. The results of this study can be used as a reference for teachers to provide higher order thinking problems based on problem solving and familiarize students with solving problems with these characteristics.

Keywords
Research and development, Higher order thinking skills, Problem solving, Nervous system

Topic
Biology Education

Link: https://ifory.id/abstract/WJ3TyFZCcK7n

Corresponding Author
Teddy Alfra Siagian

Institutions
1) Program Studi Pendidikan Matematika, Universitas Bengkulu, Jl. WR Supratman, Kota Bengkulu 38122, Indonesia
*teddysiagian[at]unib.ac.id
2) Program Studi Pendidikan Matematika, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V, Kota Medan, 20221, Indonesia

Abstract
The purposes of this study were: 1) Developed problem-based on learning tools who meet the criteria are valid, pratical, and effective; 2) Described the improvement of mathematical problem solving skills of student using learning device based on problem based learning developed . Research development of 4-D model was done in two stages: 1) the development of learning devices; and 2) testing devices. The subject in this study were students of class X SMAN 1 Pematangsiantar, while the objects is the PBL developed, mathematical problem solving skill students. The results were obtained: 1) The learning devices based on PBL that developed have valid criteria, practical and effective; 2) There is an increased ability of mathematical problem solving skill of student using learning device based PBL developed.

Keywords
PBL devices development, mathematical problem solving ability

Topic
Mathematics Education

Link: https://ifory.id/abstract/24YGMyfwZxCt

Corresponding Author
LISMEIRIZA LISMEIRIZA

Institutions
Program Pascasarjana Pendidikan IPA, Universitas Bengkulu, Jl. WR Supratman, Kota Bengkulu 38122, Indonesia

Abstract
This research aims to develop a module of medicinal plants for subject organic chemistry in natural materials to stimulate the metacognitive skills of students Tadris IPA IAIN Bengkulu. The research method refers to the steps of Research and Development. The research is began by analyzing the needs of subject organic chemistry in natural and plant materials that are often used by Bengkulu people as medicines to be used as learning resources in the form of modules. The trial of module was limited to 16 students of semester IV in the IAIN Bengkulu, Natural Sciences Study Program. The results showed that the metacognitive skills of students using the medicinal herbs module varied greatly. Student metacognitive skills are mostly good (50%), very good (6%), sufficient (6%), and lacking (38%). The ability of students in the planning aspect has developed well while the aspects of monitoring, evaluating, and revising have not developed well (enough). This local potential medicinal plant module is able to stimulate the metacognitive abilities of the fourth semester students, Tadris natural sciences Study Program, IAIN Bengkulu viewed from the classical values.

Keywords
Development, Learning Modules, Local Potential, Metacognitive Skills

Topic
Science Education

Link: https://ifory.id/abstract/br6DYjzuFpJW

Corresponding Author
Tri Isti Hartini Hartini

Institutions
Universitas Pendidikan Indonesia

Abstract
Abstract. Objectives - This study aims to develop lectures on mechanics based on multiple representations using field dependent and field independent cognitive styles (MR-FD & FI), in understanding the mastery of the concept of mechanics. In the context of physics learning based on multiple representations is to combine two or more representations as forms in widely used to understand and convey physics concepts. Cognitive style can be divided into two, namely: dependent field cognitive style (FD) and independent field cognitive style (FI). The third semester student research subjects numbered 21 students from a university in Jakarta Indonesia. The instrument used consisted of a content module that contained 4 gravity mechanics and central force (GGS) content, particle system dynamics (DSP), rigid object rotation (RBT) and rigid object rotation in three dimensions (RBT3D) that had to be filled in and student worksheets (LKM) in which there are questions that students work on. Methods - Descriptive quantitative and qualitative research are carried out to get a clear picture of MR implementation using FD and FI cognitive styles. Findings- The results showed that most students have a field dependent (FD) thinking style seen in the post-test results on GGS material 61.90%, RBT 61.90%, DSP 57.14% and RBT3D 57.14%. For independent field thinking (FI), the results of post-test results were 42.86% DSP, RBT 38.10%, RBT3D 38.10% and GGS 33.33%. It is concluded that students thinking styles can change from thinking styles that were initially field dependent (FD) can change to field independent (FI) this can occur due to various factors, including; 1) Health conditions, classrooms and students focus; 2) The level of difficulty and ease of conceptualization of the material being studied; 3) Basic math and physical abilities. Research Limitations - Limitations in this study involve only subjects from small classes from one university, so the results are not strong enough to represent the overall situation, this can be a way to conduct further research with more and more diverse subjects. Originality- This study is the first to map the understanding of the concept of mechanics based on multiple representations using the FD and FI cognitive styles. The results of the study find new discoveries, where all students have a cognitive style of either FD or FI.

Keywords
Mechanics, Multiple Representations (MR), Field dependent (FD) and Field independent (FI) Cognitive Style

Topic
Physics Education

Link: https://ifory.id/abstract/7PnGRgT3NqyC

Corresponding Author
Henny Johan

Institutions
Universitas Bengkulu, Universitas Terbuka, Universitas Bengkulu

Abstract
This study aims to describe the components needed in developing phenomenon-based learning to stimulate reasoning and spiritual awareness on earth and space science concepts. This study used descriptive qualitative method. The results of the need assessment stage include three aspects including the analysis of IPBA learning, preliminary studies and policy studies. The results of the IPBA concept analysis show that the IPBA concept is related to various natural phenomena that cannot be directly observed, requires the ability to reason in understanding the IPBA concept, various visualization media such as animations, simulations, scientific models, drawings, and graphics and tables can be utilized to facilitate understanding IPBA concepts. In addition, various IPBA concepts have the potential to in still spiritual attitudes related to awareness and belief in the nature of God. The results of policy studies show that Law No. 12 of 2012 requires learning that is able to develop students- reasoning skill and facilitate the development of students thinking abilities, talents and interests. PP No. 8 of 2012 concerning the Indonesian National Qualification Framework (KKNI) suggests the need to develop affection, one of which is to fear God who is almighty. The real conditions show that learning had not yet explored the ability to reason and has not been oriented to spiritual values. The results of the preliminary study showed that according to students perceptions, the concept of earth science could not be observed directly so it was difficult to understand. Students reasoning ability is also relatively low. Based on the results of the study it can be concluded that it is necessary to develop phenomenon-based learning to stimulate the students- reasoning skill and be oriented to spiritual awareness

Keywords
phenomena-based learning, reasoning skill, spiritual value

Topic
Science Education

Link: https://ifory.id/abstract/K9Epe73Yd84W

Corresponding Author
idul adha

Institutions
1Program Studi Pendidikan Matematika, STKIP PGRI Lubuklinggau, Jl. Mayor Toha, Kota Lubuklinggau 31626, Indonesia
2Program Studi Pendidikan Matematika, STKIP PGRI Lubuklinggau, Lubuklinggau Jl. Mayor Toha, Kota Lubuklinggau 31626, Indonesia

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.

Keywords
Development, LKS, 4D

Topic
Mathematics Education

Link: https://ifory.id/abstract/RkZu3En9ywQG

Corresponding Author
Sepi Wulandari

Institutions
1 Program Studi Tadris Matematika, Institut Agama Islam Negeri Bengkulu, Jl. Raden Fatah Pagar Dewa, Telp. (0736) 51276 Kota Bengkulu 38211, Indonesia
2 Departemen Tadris Matematika, Institut Agama Islam Negeri Bengkulu, Jl. Raden Fatah Pagar Dewa, Telp. (0736) 51276 Kota Bengkulu 38211, Indonesia
*Sepiwulandari122[at]gmail.com

Abstract
Abstract. This research is to develop a mathematics learning tool for Student Worksheet (students worksheets) based on a scientific approach that is valid, effective, and practical. The research method used is the development research with the Plom Model consisting of 3 stages, namely the initial investigation phase (preliminary research), the development phase or making a prototype (development or prototyping phase), and the assessment phase (assessment phase). The subjects of this study were students of class VII SMP 10 Bengkulu city consisting of 32 students. Data collection techniques in the preliminary stage are document analysis, while the formative evaluation stage is walk through, observation, and students worksheets tests. The results of this study are in the form of products, namely: Student Worksheet (students worksheets). The results showed that the students worksheets in the valid category based on the score obtained 3.50 was stated to meet the criteria, for practicality tests a score of 3.55 met the criteria stated practical, whereas for the effectiveness test a score of 83 had met the completeness criteria, so it can be said that the learning kit students worksheets mathematics based on a scientific approach to class VII material can already be used.

Keywords
Scientific Approach, Students Worksheet, Research and Develomment

Topic
Mathematics Education

Link: https://ifory.id/abstract/DeKZrAqy7dxN

Corresponding Author
Maria Luthfiana

Institutions
STKIP PGRI LUBUKLINGGAU
maria_luthfiana[at]yahoo.co.id

Abstract
This research aims to develop high quality PMR based on Student Worksheet (LKS) to facilitate mathematical reasoning ability of grade XI students of SMA Negeri 1 Lubuklinggau. This research used research and development method (Research and development) and the stage of Analysis Design, Development, Implementation, and Evaluation. In the development stage, there are two kinds of processes, namely the development of LKS and LKS validation, then evaluated LKS by the experts of linguists, and media experts. Validity of LKS was developed categorized "Valid" with an average score of 3.09 was determined based on the LKS assessment result by 3 experts (material experts, linguists, and media experts) maximum score was 4.00. Data analysis used LKS Practicality analysis developed "Praktis" with an average score of 3.38 is determined based on the result of student response to LKS. Descriptive and statistical analysis. The effectiveness can be seen from the results of students achievement tests. Based on the results of the Test Achievement shows that the percentage mastery learning class XI SMA Negeri 1 Lubuklinggau was 87%. Thus, learning mastery reaches good criteria, In shortly, LKS that used in teaching and learning was effective.

Keywords
Student Worksheet, PMR, mathematical reasoning ability

Topic
Mathematics Education

Link: https://ifory.id/abstract/ZX4gqY2wQdUj

Corresponding Author
ahmad syarkowi

Institutions
Universitas Bengkulu, Universitas Jambi

Abstract
This research aims to describe the difficulties of the pre-service teacher in designing and implementing inquiry learning in senior high school. A case study design was used for this research. Three pre-service teachers were interviewed and observed to determine the distressing point. This research finds all of the respondents started to design learning inquiry from finding some examples of the inquiry learning process on the internet or senior thesis report and imitated that in their lesson plan. This reflected they had the problem of a doubt what the inquiry process looks like. Along with their self-research about inquiry process illustrations, some of them tried to get the clue in the published article on the internet. It took several weeks to self-analyze what they found on the internet. The majority of problems is lack of English understanding. For the implementation process, most of them were able to run the teaching but all of them had a problem with applying the assessment process. Most of them thought the assessment process was just in the formative assessment, not along with the learning process. This research also concludes if they still have much lack of skill in guiding the students in inquiry learning using guided questions.

Keywords
Difficulties, pre-service teacher, inquiry learning

Topic
Physics Education

Link: https://ifory.id/abstract/dypUjkg7WHRA

Corresponding Author
Iwan Setiawan

Institutions
Physics Education Department University of Bengkulu.
Physics Department Bandung Institute of Technology.

Abstract
We study a scheme of accelerated adiabatic quantum dynamics. This scheme was originally proposed by Masuda-Nakamura. The strategy of combining two opposite idea: infinitely-large time magnification factor and infinitely-small growth rate of adiabatic parameter was elucidated. We apply the proposed method to the quantum Hall system with electric and magnetic field in the two dimensional (xy) plane and obtain regularization term, driving potential and driving Hamiltonian to accelerate the system. The driving potential and the driving Hamiltonian to be able to accelerate adiabatic electron dynamics in the ground state trapped in the xy plane and electric field in the x direction and a constant magnetic field in y direction.

Keywords
Driving energy, adiabatic, Quantum Hall

Topic
Physics

Link: https://ifory.id/abstract/xajXw73eTVLz

Corresponding Author
Ulfasari Rafflesia

Institutions
Universitas Bengkulu

Abstract
This study discusses the optimization of production plans using a dynamic programming through a case study on the one of a convection company. 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 with respect to school uniform production plans for the monthly-period demands of next one year. The initial step used in the production planning is by estimating the monthly-period demands of products for the next one year based on the monthly-period demands of previous 3-years. The implementation of dynamic programming brings to break down the case problem into 12 stages with respect to the monthly periods of the next one year. This study results in the total minimum cost of production plan for the next twelve months. Therefore it convinces that the production planning through dynamic programming is able to maintain the existence of a convection company due to its significant advantages of the approach for future production planning.

Keywords
Production planning, optimization, demand, dynamic programming

Topic
Mathematics

Link: https://ifory.id/abstract/vdRtrUZJqYmA

Corresponding Author
Pani Aswin

Institutions
1Program Pascasarjana Pendidikan IPA, Universitas Bengkulu, Jl. WR Supratman, Kota Bengkulu 38122, Indonesia

Abstract
The aims of this study is to prove that the solid particles of Hydnophytum moseleyanum Becc against Ureum Mus musculus levels are infected with malaria. The design of this research is by post group only control group design. The sample used was male Mus musculus which was divided into 5 groups. The treatments given are non-effective kontorl + aquades (P0), infection + aquades (P1), Nano 0.026 gr / kb bb (P2), Nano 0.056 gr / kb bb (P3), and Nano 0.084 gr / kb bb (P4) ). The results of each treatment were sequentially 0.52 (P0); 0.46 (P1); 0.42 (P2); 0.50 (P3); 0.46 (P4). The results of the analysis show that doses of P2 and P4 can reduce the level of ureum of mice that have malaria. The result of this researh is nano Hydnophytum moseleyanum Becc Solid Lipid Particles at doses P2 and P3 more effetive for influence the levels of mice ureum.

Keywords
Nano Solid Lipid, Hydnophytum moseleyanum Becc Gradually, Malaria

Topic
Biology

Link: https://ifory.id/abstract/m8YtrcHzXWUu

Corresponding Author
Fibrika Rahmat Basuki

Institutions
a, b, c) Physics Education Departement Universitas Jamb, Jambi, Indonesia
*) fibrikabika[at]yahoo.com
d) Mathematic Education Departement Universitas Jambi, Jambi, Indonesia

Abstract
Lemang bamboo is a Sumatera traditional food made from glutinous rice that cooked in bamboo. Melemang is one of the jambi community traditions that has been passed down for generations. This study aims to analyze science concepts and map basic competencies that can be integrated with the process of making lemang bamboo. This research was a qualitative research through ethnoscience studies. The research subjects were lemang sellers in Muaro Jambi and Batanghari areas. Data collected through interviews and observations. Data were analyzed descriptively and reconstructed into scientific knowledge. The results of this study indicate that there are 10 indigineus knowledge about the process of making lemang bamboo which can be reconstructed into scientific knowledge. The concept of science found in the process of making lemang bamboo were measurement, classification of living things, temperature and heat. The process of making lemang bamboo can be used as a source of learning science.

Keywords
Ethnoscience, lemang bamboo, scientific knowledge

Topic
Science Education

Link: https://ifory.id/abstract/RJn8eFwgadAY

Corresponding Author
KASRINA KASRINA

Institutions
1. Mahasiswa Program Pasca Sarjana FKIP Universitas Bengkulu Jl. WR Supratman, Kota Bengkulu 38122, Indonesia
2. Program Studi Pendidikan Biologi, FKIP Universitas Bengkulu, Indonesia

Abstract
Abstract. Although Ethnobotany study research has been carried out in Bengkulu, there is still a lot of data that has not been revealed and the results have not been well documented in a media that contains a dictionary. For this reason, this case study was developed and developed. This research aims to inventory medicinal plants in Bengkulu and is developed as a learning medium that contains a dictionary of Bengkulu medicinal plants. Research methodology by conducting field surveys by means of exploration, observation, interviews with informants selected by purposive sampling and literature study. Data analysis was performed descriptively. From the results of studies on the family Euphorbiaceae found 10 types of medicinal plants, for examples: “Kemiri”/ Candlenut (Aleurites moluccina), “Anting-anting” (Acalypha australis), Patah tulang (Euphorbia tirucalli) and others. Tonsils, headaches, wound medicine, malaria, jaundice, magh, itching, colds, warts, heart disease and so on. From the survey results found differences in the use of plants between informants. In general, many of these plants are surrounded by our environment in the form of liar plants and cultivation plants. Relating to medicinal plants that are documented to contain a dictionary book will help in the learning process related to medicinal plants.

Keywords
Ethnobotany,Euphorbiaceae,Bengkulu

Topic
Biology Education

Link: https://ifory.id/abstract/Y64ZfvanKDbG

Corresponding Author
Dyah Fitriani

Institutions
*Chemistry Department, Faculty of Mathematics and Natural Sciences Universitas Bengkulu, Jl. WR Supratman, Bengkulu 38122, Indonesia

Abstract
A research on the extraction of essential oil from the peel and residue of squeezed kalamansi orange water has been carried out. This research aims to determine the yield resulting from the extraction of essential oil from the peel and residue of squeezed kalamansi orange water.Then,the quality of essential oil produced will be determined including specific gravity, refractive index as well as identification of the components of chemical compounds contained in essential oil by using GC-MS.The extraction of essential oil was done by steam distillation and water distillation. The comparison between samples and aquades was 1:1 and 2:1 either for the peel sample or the sample of residue of squeezed kalamansi orange water.From the results of extraction,the essential oil which was clearly colorless yellowish with a distinctive odor of kalamansi orange was obtained.The yield of essential oil produced from the residue squeezed kalamansi orange water at a ratio of 1:1 and 2:1 respectively was 1.34 % and 1.4 %, while that from the peel with a ratio of 1:1 and 2:1 respectively was 0.0294 % and 0.0258 %.The result of characterization using GC-MS showed the main component of essential oil was limonene with a content of 98% either from the peel or from the residue of squeezed kalamansi orange water. While, the specific gravity obtained ranged between 0.824 – 0.838 g/mL and the refractive index ranged between 1.4758 – 1.4765.

Keywords
Kalamansi Orange, Essential oil, GC-MS

Topic
Chemistry

Link: https://ifory.id/abstract/Etajm9G2U3wf

Corresponding Author
Hari Sumardi

Institutions
a) Graduate School of Mathematics Education, Bengkulu University, Bengkulu 38371, Indonesia
*harisumardi[at]unib.ac.id
b) Department of Mathematics, University of Sumatera Utara, Medan 20155, Indonesia

Abstract
A two-colored digraph (D^{(2)}) is called primitive if there exist nonnegative integers (h) and (k) such that for each ordered pair of vertices (v_a) and (v_b) there are ((h,k))-walk from (v_a) to (v_b) and (v_b) to (v_a). The competition index of a primitive two-colored digraph is the smallest positive integer (h+k) such that for each pair of vertices (v_a) and (v_b) there is a vertex (v_c) such that there are ((h,k))-walks from (v_a) to (v_c) and from (v_b) to (v_c). We study the generalized competition index of two-colored Wielandt digraphs.

Keywords
Two-colored digraph; Competition index; Generalized competition index

Topic
Mathematics

Link: https://ifory.id/abstract/xtfurVzK8HMP

Corresponding Author
Intan Delia Sapitri

Institutions
Departement of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu
Jl. W.R. Supratman, Kandang Limun 38317 A Bengkulu, Indonesia
*e-mail address : asdim[at]unib.ac.id, intandeliajg[at]gmail.com

Abstract
Tin (IV) dioxide (SnO2) is a semiconductor material with a band gap of around 3.6 eV. It is considerable technological importance with a number of applications, especially for photoelectrodes, detection of flammable toxic gases, thin film coatings, and gas sensors. This research aims to determine the effect of variations in glucose concentration as a capping agent to the crystallinity and morphology of SnO2. The synthesis of SnO2 nanoparticles has been investigated by using several methods such as hydrothermal, sol-gel and solvhotermal methods. Especially for hydrothermal method, several capping agents such as rarasaponin in Sapindus rarak, cetyl trimethylammonium bromide (CTAB), and ethylenediaminetetraacetid acid (EDTA) that can reduce the formation of aggregates. This synthesis was carried out by the hydrothermal method at 100 oC for 3 hours. SnO2 nanoparticles as synthesized was characterized by using X-Ray Difraction (XRD) and Scanning Electron Microscope (SEM). The crystallinity of SnO2 nanocrystal as shown in XRD pattern was influence by changing of glucose concentration. SEM images show that aggregate formation is influenced by variations of glucose concentration as a capping agent. These results show that aggregate growth in the formation of SnO2 nanoparticles could be controlled by optimized glucose concentration in reaction solution.

Keywords
Nanoparticles, SnO2, Capping agent, Glucose

Topic
Chemistry

Link: https://ifory.id/abstract/AMnZKwjRT9zG

Corresponding Author
M. Lutfi Firdaus

Institutions
1 Graduate School of Science Education, Bengkulu 38371, Indonesia
2 Material Science Research Group, Universitas BSI, Bandung 40291, Indonesia

Abstract
Here we report the green synthesis of silver nanoparticles using a reductant of fruit extract of common grape vine (Vitis vinivera), and its application for mercury ion detection. The precursor of silver nanoparticles was silver nitrate, and the formation of silver nanoparticles was accelerated in the presence of sunlight. After 30 minutes of sunlight 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. In addition, we used the digital image-based colorimetry method to quantify mercury ions in samples solution. Compared to the reference method, the developed colorimetry was accurate up to 99.38%.

Keywords
mercury; silver nanoparticles; vitis vinivera; colorimetry; spectrophotometry; digital image.

Topic
Chemistry

Link: https://ifory.id/abstract/7ACHzwnaeMD4

Corresponding Author
Dian Fita Lestari

Institutions
Jurusan Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Bengkulu
Jl. W.R. Supratman, Kandang Limun, Bengkulu 38371, Indonesia.
email: dianfita[at]unib.com

Abstract
Gunung Kidul is one of the districts in Yogyakarta province that has a long coastline with a substrate of coral (rocky shores) and white sand. One of the beaches with rocky substrate is Indrayanti. The rocky substrates are different from other substrate which have physicochemical factors changes in water and gives its own character for the life of marine organism in intertidal zone. Mollusca as one of the phylum that live mostly in the marine and some are in intertidal zone of marine with coral substrates. This aim of the research to identification the types of mollusca that found in the intertidal zone of the Indrayanti and classifying each species found. This research method by observation and data collection techniques by accidental sampling during low tide. The data in this research are qualitative data that analyzed by descriptive. The result of this research shows that the mollusca phylum which inhabited the intertidal zone of the Indrayanti beach found 4 classes from 7 classes in Mollusca phylum, there are gastropoda, bivalvia, polyplacophora, and cephalopoda classes with a total amount of 83 species. Gastropoda class that dominate of all species are about 69 species or 83,13%, with the most subclass order are caenogastropoda, heterobranchia, patellogastropoda, vetigastropoda and neritimorpha. Polyplacophora class which is a chiton group is found around 8,43% and the remaining species found are bivalves and cephalopoda classes.

Keywords
mollusca, intertidal zone, indrayanti beach

Topic
Biology

Link: https://ifory.id/abstract/wbpBR7MFjtf6

Corresponding Author
Desy hanisa Putri

Institutions
1Program Studi Pendidikan Fisika, UniversitasBengkulu, Jl. WR Supratman, Kota Bengkulu 38122, Indonesia

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. 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 0f bengkulu city high school student 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.

Keywords
21st Century Skills, critical thingking skill, comunication skill

Topic
Physics Education

Link: https://ifory.id/abstract/4NXZMpLzcaC9

Corresponding Author
Saleh Haji

Institutions
(1) Bengkulu University, Indonesia
(2) Universitas Terbuka, Indonesia

Abstract
This research was aimed to implement Realistic Mathematics Education learning model with outdoor approach in elemtary 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 analized 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.

Keywords
Realistic Mathematics Education, Outdoor, Presenting and Processing Data

Topic
Mathematics Education

Link: https://ifory.id/abstract/GnpKx7Tf4Q8V

Corresponding Author
Miska Agustina

Institutions
Program Studi Pendidikan Matematika, Universitas Bengkulu, Jl. WR Supratman, Kota Bengkulu 38122, Indonesia

Abstract
The purpose of this study is to improve student learning outcomes in Algebra Abstract by applying a scientific approach assisted by Student Worksheets (LKM). This type of research is Classroom Action Research (CAR) which is carried out in three cycles with research flow, namely planning, observing and reflecting. The subjects of this study were students of the semester 201/20/2019 TA totaling 37 students. The instrument used in this study was the Learning Outcomes Test for Abstract Algebra. The results of this study indicate an increase in each cycle. Judging from the cycles I, II, III, found the average learning outcomes 51.35, 77.02 and 89.59.

Keywords
Learning Outcomes, Scientific Approach, Student Worksheet

Topic
Mathematics Education

Link: https://ifory.id/abstract/te2YZFDp8aN6