Indonesia Conference Directory

Corresponding Author
Agustin Zarkani

Institutions
1) Department of Plant Protection, Faculty of Agriculture, University of Bengkulu, Bengkulu, Indonesia.
2) Biotechnology Research Centre, Çukurova University, Adana, Turkey.

*E-mail: agustinzarkani[at]unib.ac.id

Abstract
Eleven species of Pseudococcidae scales are known to live on oil palm (Elaeis guineensis Jacq). Here we report an outbreak of a suspected new species which is morphologically closed to Dysmicoccus finitimus Williams 1994 (Hemiptera: Pseudococcidae) on oil palm in Bengkulu Province, Indonesia. Some features are known different in the number of cerrarii, type of macro lobes, and longest anal-lobe seta. In addition, the natural enemies associated with the species were also listed.

Keywords
Biodiversity, oil palm, palmae, scale insect, taxonomy

Topic
Biology

Link: https://ifory.id/abstract/6G8nzM7YyrNU

Corresponding Author
Mela Aziza

Institutions
1 Program Studi Tadris Matematika, IAIN Bengkulu, Jl. Raden Fatah, Pagar Dewa, Kota Bengkulu 38877, Indonesia
2 Centro de Atención Integral para la Discapacidad (CAID), Ave. Luperón casi esq. Enriquillo, Zona Industrial de Herrera, Santo Domingo, D.N. República Dominicana
3 Madrasah Aliyah Negeri 2 Kudus, Jalan Mijen, Mijen, Prambatan Kidul, Kec. Kaliwungu, Kabupaten Kudus, Jawa Tengah 59331, Indonesia

Abstract
Some previous research found out that teaching the usefulness of mathematics in the classroom was pivotal. However, there was still a lack of research regarding how this happened in the classrooms. Therefore, this qualitative study would to find how British mathematics teachers- beliefs and their teaching practice related to the usefulness of mathematics in daily life. Four British mathematics teachers who were taking master degree program in University of Bristol and had experience in teaching mathematics in the UK were chosen by using non-probability sampling method. The data collection method used was a semi-structured interview using open-ended questions. During the interview, everyone would be asked about 25 minutes to know how their perspective related to their beliefs and teaching practice. The audiotape recording of the interview was transcribed and then analysed using thematic analysis from Braun and Clarke. According to the analysis data, there were four main themes of beliefs from British mathematics teachers regarding to the usefulness of mathematics and two main themes of teaching practice that have been done based on their teaching experience.

Keywords
teachers beliefs, teaching practice

Topic
Mathematics Education

Link: https://ifory.id/abstract/7RLgQH6nBVby

Corresponding Author
Emilia Candrawati

Institutions

1 Science Education Study Program, University of Bengkulu, Kandang Limun, Bengkulu
2 Biotechnology Center, Agency for Assessment and Application of Technology, Serpong, South Tangerang, Indonesia
3 Graduate School of Science Education, University of Bengkulu, Kandang Limun, Bengkulu

Abstract
This study was undertaken to evaluate the antifungal activities of the bioactive compounds produced by endophytic bacteria isolated from oil palm plants using TLC-Bioautography. Antifungal compounds used in this study have been extracted from potential endophytic bacteria from previous studies using ethyl acetate solvents. The antifungal compound was tested for its activity against the pathogenic fungus Fusarium oxysporum f.sp by using the TLC-bioautography method. The results showed 3 spots on the TLC plate for samples of B11 antifungal compounds with an incubation time of 54 hours and B11 with an incubation time of 24 hours. Observations 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 by B11 with an incubation time of 54 hours is only 11.08%.

Keywords
Endophytic bacteria, Bioactive compound, Bioautography, Fusarium oxysporum f.sp.

Topic
Other Relevant Topic

Link: https://ifory.id/abstract/Fd4kqRQeKHEy

Corresponding Author
Dewi Rahimah

Institutions
(1) School of Education, The University of Queensland,
Building 24 (Social Science Building), St Lucia Campus, Brisbane, Queensland 4072 Australia
(2) Program Studi Pendidikan Matematika, Jurusan Pendidikan Matematika dan Ilmu Pengetahuan Alam, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Bengkulu, Jl. W.R. Supratman, Kandang Limun, Bengkulu 38371A Indonesia

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.

Keywords
Horizontal analysis; Vertical analysis; Contextual analysis; Mathematics textbook analysis

Topic
Mathematics Education

Link: https://ifory.id/abstract/zjNJyKT2rQxp

Corresponding Author
kodri madang

Institutions
1 Biology Education, Universitas Sriwijaya, Indonesia. Jalan Palembang-Prabumulih Km.32 Ogan Ilir, Indonesia.

Abstract
This study aims at obtaining pre-service biology teachers- metacognitive skills in invertebrate zoology. A number of pre-service biology teachers that take invertebrate zoology course at a state university in Sumatera, Indonesia, were involved as participants in this study. Data on metacognitive skills were collected using metacognitive skills instrument test that have been developed. The data obtained were processed by calculating the percentage (%) for each indicator of metacognitive skills. Research results show that the value of pre-service biology teachers- metacognitive skills on invertebrate zoology are 23.46, for each indicator of metacognitive skill are no logic, no systemic, no analyse/evaluate/create (40.00); no logic, no systemic, less analyse/evaluate/create (64.56%); no logic, no systemic, have analyse/evaluate/create (31.60%), no logic, no systemic, analyse/evaluate/create (2.53%), no logic, systemic, analyse/evaluate/create (1.27%). Based on the results of this study, it is suggested that pre-service biology teachers- metacognitive skills in invertebrate zoology was very low. In order to repair pre-service biology teachers- metacognitive skills, it is needed revision on instructional strategies for invertebrate zoology course.

Keywords
pre-service biology teachers-, metacognitive skills, invertebrate zoology

Topic
Biology Education

Link: https://ifory.id/abstract/v6rqQYfwbdL8

Corresponding Author
AS Elly

Institutions
a) STKIP PGRI Lubuklinggau
Jl. Mayor Toha Kel. Air Kuti Telp.(0711) 451432 Lubuklinggau
*asellystkip05[at]gmail.com
b) STKIP PGRI Lubuklinggau
Jl. Mayor Toha Kel. Air Kuti Telp.(0711) 451432 Lubuklinggau

Abstract
This study aims to describe the ability of junior high school students to solve PISA mathematical problems using the Lubuklinggau context in terms of the PISA level. The subjects in this study were students of class IX.5 Middle School 5 Lubuklinggau. The method in this research is descriptive qualitative method. The instruments and data collection techniques used were test sheets and questionnaires as well as interview guidelines. Data analysis of data through 3 channels, namely data reduction, data presentation, and drawing conclusions. The results obtained indicate that the level I PISA Problem in the category is very good with an average value of 91.07, level II in the category is very good with an average value of 91.96, level III in the good category with an average value of 72.45 , level IV in the good category with an average value of 61.61, level V in the sufficient category with an average value of 58.16, and level VI in the Less category with an average value of 38.10. So it can be concluded that the ability of class IX students of SMP Negeri 5 Lubuklinggau in solving mathematical problems using the PISA model Lubuklinggau context in terms of PISA level is included in both categories with an overall average value of 68.89.

Keywords
Student Ability; PISA; Lubuklinggau Context

Topic
Mathematics Education

Link: https://ifory.id/abstract/u4URYBemGP28

Corresponding Author
Eko Risdianto

Institutions
University of Bengkulu

Abstract
The problem examined in this study was how students respond to learning with the Direct Instruction Ethnoscience-based that connected the intensity and intensity of material with Bengkulus dol music in teaching and learning activities. The aim of the researchers was to analyze students responses to learning with the model Direct Instruction based 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 themodel Direct Instruction based on ethnosains. In other words, students are happy with the components of learning that are applied

Keywords
Ethnoscience , Racsh Model Analisys, Critical Thinking Ability,

Topic
Physics Education

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

Corresponding Author
SUGIARTI ATIQ

Institutions
a.b))* PHYSICS EDUCATION
UNIVERSITY of PGRI PALEMBANG
JL. Jenderal Ahmad Yani Lr. Gotong Royong Palembang
sugiartialatiq[at]gmail.com
dwi.dyalovai[at]gmail.com

Abstract
The purpose of this study is to describe the ability of students science process skills on electrical material after the implementation of discovery learning models. Discovery learning model is a learning model that guides students to make discoveries through experimental activities. This study uses a quasi-experimental method with one shot pretest post test design. The material used in this research instrument is electrical material presented of the second semester physics education program students at PGRI Palembang University.The results of this study indicate the science process skills in electrical material are included in the medium category with an average value of 61.46%. The science process skills in the observation aspect are the science process skills which have the highest percentage of 71.3% followed by the science process skills in the measurement and conclusion aspects of 66.2% and 65.9%. While the lowest skills are the science process skills in the classification and predicting aspects of 58.4% and 45.5%.

Keywords
science process skills, discovery

Topic
Physics Education

Link: https://ifory.id/abstract/R8Zn2yLX7E94

Corresponding Author
Ermayanti Ermayanti

Institutions
1 Biology Education, Universitas Sriwijaya, Indonesia. Jalan Palembang-Prabumulih Km.32 Ogan Ilir, Indonesia.

Abstract
This study aims at obtaining students- creative thinking skills in Biology education student. A number of biology education students that take plant microtechnique course at a state university in Sumatera, Indonesia, were involved as participants in this study. Data on creative thinking skills were collected using creative thinking instrument test that have been developed. The data obtained were processed by calculating the percentage (%) for each indicator of creative thinking. Research results show that students- creative thinking on plant microtechnical laboratory practices are: fluency (40.00); flexibility (25.55), originality (26.03), and elaboration (30.00). Based on the results of this study, it is suggested that students- creative thinking skills in plant microtechnical laboratory practices was very low. In order to increase students- creative thinking skills, it is needed revision on instructional strategies for plant microtechnique course.

Keywords
creative thinking, plant microtechnical, laboratory practices

Topic
Biology Education

Link: https://ifory.id/abstract/CYQHveqT276M

Corresponding Author
Wawan Kurniawan

Institutions
(a) Department Physics Education, Universitas Jambi

Abstract
The colour quality of batik jambi fabric using natural and chemical dyes needs to be tested for its resistance to washing (friction) and heating (thermal) treatment both for drying and ironing. Fabric fading is affected by decreasing the level of brightness and reducing blackish colour and increasing white in an element of colour. The purpose of this study was to measure the level of fading of the colour of the batik jambi cloth using the colour histogram method. The process of this research uses several sizes of jambi batik cloth obtained by three batik production / craftsmen in the Jambi Kota Seberang. Process Treatment of each sample through washing, drying and ironing with temperature variations of 50, 75 and 100 Celsius. Then take a digital photo image and analyzed the level of RGB colour intensity (Red, Green, Blue). If there is a level of change in the increase or decrease in the intensity of the RGB colour, then there is an indication of dis-colouration on the fabric. The results of the testing of the colour of the batik jambi cloth using a colour histogram showed a good degree of colour brightness resistance after a number of treatments, so testing the level of fading of the colour of the batik jambi cloth proved the quality of the natural dyeing process was very good.

Keywords
Colour histogram method; Batik jambi; Digital image processing

Topic
Physics

Link: https://ifory.id/abstract/P8EedLAfu7M2

Corresponding Author
JUMRODAH JUMRODAH

Institutions
1 Program Studi Pendidikan IPA, Sekolah Pascasarjana, Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia
2 Program Studi Tadris Biologi, Institut Agama Islam Negeri Palangka Raya, Indonesia Jl. G. Obos Komplek Islamic Centre Palangka Raya Indonesia

Abstract
The purpose of this study is to determine the critical thinking skills of pre-service Biology teachers in marine ecology. This study uses a test method. The subjects consisted of 36 pre-service teachers in the 7 and 9 semesters at one of the universities in Bandung. The instrument uses reasoned multiple choice critical thinking skills tests and essay test. Data were analyzed using quantitative descriptive analysis techniques. The results showed that students critical thinking was in the medium category. Other results indicate that teaching has led to the learning of critical thinking skills.

Keywords
pre-service biology teacher, critical thinking, marine biology

Topic
Biology Education

Link: https://ifory.id/abstract/AbadKzcvR6Qm

Corresponding Author
Sri wahyu Kurnia

Institutions
Department Of Chemistry, Faculty of Mathematic and Natural Science, University of Bengkulu, Jl. WR. Supratman, Bengkulu 38371, Indonesia
email = morina[at]unib.ac.id; morinaadfa[at]yahoo.com

Abstract
The aims of this reseach were to determine the antibacterial activity of methanol extract from sambang darah (Excoecaria cochichinensis L.) leaves againts to the growth of the Staphylococcus epidermidis acne bacteria and to determine the most effective concentration of the tested samples. Antibacterial test was performed by variation concentrations of extract 2 mg/mL, 4 mg/mL, 6 mg/mL, 16 mg/mL, 32 mg/mL, and 64 mg/mL, antibiotic clindamycin as positive controls, and DMSO as negative control. The antibacterial activity of methanol extract from sambang darah (Excoecaria cochichinensis L.) leaves showed that the Staphylococcus epidermidis growth inhibitory was increased when the concentration of methanol extract from sambang darah (Excoecaria cochichinensis L.) leaves increased. A concentration of 64 mg/mL indicated the highest inhibition zone (12.94 mm). Based on Porce et al., (2003) the average of inhibition zone of 64 mg/mL concentration was summarized as moderate category that can inhibit the growth of Staphylococcus epidermidis bacteria.

Keywords
Antibacterial, Excoecaria cochichinensis L., Staphylococcus epidermidis

Topic
Chemistry

Link: https://ifory.id/abstract/zHnRDTtB2Nup

Corresponding Author
Zulfia Memi Mayasari

Institutions
Mathematics Department, Bengkulu University

Abstract
Batik besurek is one of Indonesias cultural heritages from Bengkulu Province. This batik is different from another batik in general because it has the characteristics of Arabic calligraphy. There are seven types basic of motifs in batik besurek, one of them is the Arabic calligraphy motif. In this paper explained the development of the pattern of the Arabic calligraphy and rafflesia flower motif in batik besurek. The pattern development is done by applying the fractal principles. The results is a new motif of batik besurek that are expected to enrich the style, shape, diversity of motifs, and enhance the beauty and selling value of the batik itself.

Keywords
batik besurek, fractal principles, characteristic, arabic calligraphy

Topic
Mathematics

Link: https://ifory.id/abstract/p4cg2AQ9DMnL

Corresponding Author
Syaiful Rochman

Institutions
Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Bengkulu

Abstract
This research was conducted to improve the quality of learning in basic physics 1 course, namely to improve holistic thinking skills and improve student cognitive learning outcomes by applying integrated science. This research is a Classroom Action Research (CAR) which consists of three cycles. Each cycle consists of planning, observation, and reflection. The population of this research is the science education student of FKIP UNIB taking basic physics 1 in the odd semester of the 2019/2020 school year. The research instruments used were observation sheets and tests. Observation sheet data was assessed with a score of 1-3 (1 = insufficient, 2 = sufficient, and 3 = good). Test data is processed to look for average, absorption, and mastery learning. The success indicator can be seen from the activity score, which is if cycle III> cycle II> cycle I and good category. Learning outcomes are said to be increased if the average in cycle III> cycle II> cycle I. Absorption is said to increase if cycle III> cycle II> cycle I.

Keywords
Integrated Science, Holistic, Learning Outcomes

Topic
Science Education

Link: https://ifory.id/abstract/ugKVzGdEJj2p

Corresponding Author
Santhy Wyantuti

Institutions
1 Department of Chemistry, Faculty of Mathematics and Science, University of Padjadjaran Jalan Raya Bandung Sumedang KM.21, West Java, Indonesia
2 Graduate School of Science Education, University of Bengkulu, Indonesia

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 has 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, an 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 amplitude of 0.1 V and 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% that is satisfactory.

Keywords
Box-Behnken, differential pulse voltammetry, gadolinium, Plackett-Burman, rare earth elements.

Topic
Chemistry

Link: https://ifory.id/abstract/HLEy2wv7NFA4

Corresponding Author
Sempurna Ginting

Institutions
1,2 Department of Plant Protection, Faculty of Agriculture, University of Bengkulu. Bengkulu 383711, Bengkulu, Indonesia.
3 Department of Forestry, Faculty of Agriculture, University of Bengkulu. Bengkulu 383711, Bengkulu, Indonesia.

W.R. Supratman road, Kandang Limun, 383711, Bengkulu, Indonesia
*sempurna[at]unib.ac.id

Abstract
Onion wood is one of the commodity timber which is widely used as carpentry wood and furniture by the people of Bengkulu. Mealy bug is a pest that attacks onion wood. The purpose of this study was to evaluate the attack of mealy bug pests on onion wood plants in the forest of the campus university of Bengkulu. The study was conducted with a purposive sampling survey, sampling plants, consisting of the nursery, sapling, pole and tree phases. The results showed that mealy bug can attack all phases of onion wood growth, namely from the seedling, sapling, pole and tree phases. The population of mealy bug is highest in the pole phase, compared to other phases and the dominant mealy bug are found in the leaves. Natural enemies was found predators of the Order Neuroptera: Chrysopidae, and mites. This information is expected to be a reference in developing strategies to control mealy bug pests on onion wood plants.

Keywords
Attack, mealy bug, natural enemies, Protium javanicum

Topic
Biology

Link: https://ifory.id/abstract/GDTzAHp7k3Bd

Corresponding Author
Wahyu Widada

Institutions
Postgraduate Mathematics Education Program, Universitas Bengkulu, Indonesia

Abstract
Geometry becomes a difficult subject for students. The abstract object was one of the factors. Therefore, more concrete learning media were 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 were differences in the average ability to understand the concept of geometry between those taught with augmented reality assisted by GeoGebra and conventional controlled by covariates. 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.

Keywords
augmented reality, geogebra, geometry

Topic
Mathematics Education

Link: https://ifory.id/abstract/MREUpaLVu6Y9

Corresponding Author
Bambang Suwarno

Institutions
FKIP, Universitas Bengkulu
FKIP, Universitas Bengkulu
Universitas Bojonegoro
Student of FKIP, Universitas Bengkulu

Abstract
Successful study, including in mathematics and science, is facilitated by English fluency, for which vocabulary mastery is a good predictor. This study aims to explore the estimated mastery of basic vocabulary (first thousand word list) among first year undergraduate students at Universitas Bengkulu. The design was descriptive. The sample included a class each from various departments. The instrument was a multiple choice test. Estimated mastery was calculated on the basis of percentage of correct answers. The results were as follows. At the English study program group, M= 882.5 and SD = 60.4. At the social and humanity department group, M = 707.6 and SD = 127.5. At the mathematics, science and engineering department group, M = 740.9 and SD = 113.1. Overall, at Universitas Bengkulu, M = 739.6 and SD = 115.8. The conclusion was that vocabulary mastery among the first year students still needed improvement. Further studies are recommended to (1) improve English instruction at secondary & tertiary institutions, and (2) conduct similar explorations at other institutions.

Keywords
Vocabulary mastery, first thousand word list, first year university students

Topic
Other Relevant Topic

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

Corresponding Author
Tri Irvan Haryadi

Institutions
a) Departement of Mathematic, Faculty of Science and Technology, Universitas Airlangga, Jl. Mulyorejo, Surabaya, Indonesia
*tiharyadi[at]gmail.com

Abstract
Betweenness centrality is a concept in graph theory which is currently widely used in network analysis. The network can be an information network, criminal network, social interaction network, etc. The concept of betweenness centrality studies the potential ability of a point to exert influence on a network. If there is a point x in the shortest path between two points, then point x has the potential to influence information passing through that path. This paper will investigate the concept of betweenness centrality in the corona operation between path and star graph. Corona operation is one of the operations on graph theory that works between two graphs. The corona operation will duplicate the second graph and connect each copy to the first graph.

Keywords
Betweenness centrality; Corona; Graph

Topic
Mathematics

Link: https://ifory.id/abstract/9A4XuKeJ28RG

Corresponding Author
Razi Fahrurrazi

Institutions
1. Mahasiswa program Doktor UNIB
2. Dosen S.3 Teknologi Pendidikan
3. Dosen S.3 Manajemen Pendidikan
4. Dosen S.3 Manajemen Pendidikan

Abstract
The issue of national examinations has always been a matter of debate, because the scores are only used to determine the passing scores of students without follow-up. There are two main objectives in this study, the first is mapping the quality of schools in accordance with national exam scores, and the second is to describe the relationship between national exam scores and influential variables. The data used in this study were compiled by Idris in his dissertation and published in a book titled Critical Analysis of Education Quality in 2005. Data were analyzed with a biplot package based on Mathematica programming, by combining several national deviation scores and standards. Gabriels goodness and Pearsons correlation coefficient were each used to measure proportional compatibility in the biplot and school quality configuration in the biplot. Mapping the quality of schools according to national examination scores cannot be obtained by biplots with standard variables. National examination scores, which are transformed with 1.5 standard deviations, will show the suitability of the rankings, and the biplot correctly displays all influential variables that have a very significant positive correlation. Expanding the scope of this study and using more recent data are recommended for further studies.

Keywords
school quality mapping, principal component analysis, biplot, good level of compatibility, Pearson correlation coefficient

Topic
Mathematics

Link: https://ifory.id/abstract/QmJk2EtWnwDU

Corresponding Author
Rendy Wikrama Wardana

Institutions
(a)*. Science Education Program, Universitas Bengkulu, Bengkulu, Indonesia
(b). Science Education Program, School of Postgraduate Studies, Universitas Pendidikan Indonesia, Bandung, Indonesia
(c). Department of Physics, Faculty of Information Technology and Sciences, Parahyangan Catholic University, Bandung , Indonesia

Abstract
Some results on the conceptual change, indicated a discriminate between alternative and scientific conceptions. This could be represented as a medium conceptions, called the intermediate conceptions. Researches on the electromagnetic wave sub-concept generally assessed based on modern physics conceptions, on the other hand it needs to be assessed based on the concept of electricity and magnetism. This research aims to identify and describe category of intermediate conception of third year physics education students in electromagnetic wave sub-concepts. This research used descriptive method. The subjects of this research were 73 third year students in a University of Teacher Training at Bandung. Data collection have been done by essay test and interview. The analyzed data shows that 77% of the students are on ‘lateral intermediate conception-category and none of them were on ‘naïve physics-. Other results showed that the students have difficulty on describing, explaining, interpreting qualitatively about electromagnetic wave sub-concepts.

Keywords
Intermediate conception, Third year students, Physics education, Electromagnetic wave

Topic
Physics Education

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

Corresponding Author
Widiasih Widiasih

Institutions
Universitas Terbuka, Universitas Bengkulu

Abstract
This study aims to identify the characteristics of an online tutorial program (tuton) based on the discussion of problem solving that has been developed in the physics learning strategy course (PEFI4201). The study was conducted in 2017 using the Research & Development method which includes the stages of define, design, develop, dissemination. The limited test includes the readability of the tuton program conducted on 3 science-physics teacher students. More extensive field trials were carried out by implementing a problem-based tuton program in the tuton class in 2017.1 which involved 20 students of Science-Physics teachers who actively participated in the tuton. The results showed that the online tutorial program (tuton) based on the discussion of problem solving had the following characteristics: The results showed that the Tuton program based on discussion of problem solving learning had the following characteristics: (a) aims to provide learning assistance through tuton to be able to improve problem solving skills, plan learning skills, and mastery of concepts; (b) tuton program components include the design of tutorial activities, tutorial program units, main and supporting initiation materials, problem solving discussion materials, and tuton assignments; (c) based on behavioristic, cognitive, cybernetic, neuroscience, constructivism, andragogy theories, problem solving; (d) tuton oriented which emphasizes discussion of problem solving; (e) use assessments that measure the ability of problem solving, learning planning skills, and mastery of concepts. Observation of the implementation shows that the implementation of the tuton went well. The observation of enforceability includes the implementation of the contents of the appropriate initiation material according to the module, the interaction between the participants tuton describes the discussion of problem solving learning, describes the coherent weekly activities, describe the task of solving the problem as a whole

Keywords
online tutorial, problem solving discussion, physics learning strategy

Topic
Physics Education

Link: https://ifory.id/abstract/Y8ZQH36KMjdp

Corresponding Author
Dewi Jumiarni

Institutions
1) Universitas Bengkulu
2) Universitas Sriwijaya

Abstract
Biodiesel production technology from microalgae is widely considered as a potential and efficient method. This research was conducted to characterize microalgal species isolated from some lowlands in South Sumatera and investigated their potential for biodiesel production. Five microalgal culture isolate were selected and identified as strains of Chlorella sp PKB, Chlorella sp PPP, Chlorella sp SB, Crucigenia quadrata PTA and Scenedesmus sudetica PTA. These isolates were determined the growth rates, biomass productivity and total lipid content. Under similar environmental conditions, Chlorella sp PKB showed the highest lipid content comparison others. The results suggest that Chlorella sp PKB can be a possible candidate species for biodiesel production.

Keywords
Microalgae, biodiesel, lowland

Topic
Biology

Link: https://ifory.id/abstract/ypJ769CfDbua

Corresponding Author
Adam Malik

Institutions
1Pogram Studi Pendidikan Fisika, Universitas Islam Negeri Sunan Gunung Djati Bandung, Jl. A. H Nasution No. 105, Bandung 40614, Indonesia
2Tadris Biologi, IAIN Syekh Nurjati Cirebon, Jl. Perjuangan Sunyaragi, Kesambi, Cirebon 45131, Indonesia
3Tadris Fisika, IAIN Palangka Raya, Jl. G. Obos Islamic Center, Palangka Raya, 73111, Indonesia
4Tadris IPA Fisika, Universitas Islam Negeri Imam Bonjol Padang, Jl. Prof. Mahmud Yunus Lubuk Lintah, Padang 25153, Indonesia
5Jurusan Pendidikan Fisika, Universitas Islam Negeri Alauddin Makassar, Jl. H. M. Yasin Limpo No.36 Samata, Gowa 92111, Indonesia
6Program Studi Pendidikan Fisika, Universitas Bengkulu, Jl. WR. Supratman Kandang Limun, Bengkulu 38371, Indonesia

Abstract
The collaborative is a skill needed in facing challenges and opportunities in the era of industrial revolution 4.0. Therefore, universities must prepare prospective graduates to have collaborative skills. The purpose of this study was to describe collaborative skills that are trained and developed through laboratory activities. This study used descriptive quantitative methods. The research sample amounted to 250 teacher candidates from several Islamic universities in Indonesia. The sampling technique used random sampling, which represents Islamic universities on four islands in Indonesia. The research instrument used was a performance assessment supplemented by a rubric of assessment. The results of research prospective teacher collaboration skills were an as good category. Thus, laboratory activities can train and develop collaborative skill skills of prospective teachers.

Keywords
Collaborative, laboratory activities, elasticity

Topic
Physics Education

Link: https://ifory.id/abstract/jVDxYFyag3KG

Corresponding Author
Tugiyo Aminoto

Institutions
Universitas Jambi

Abstract
Old practices of teaching and learning, mainly based on conventional media, offer a very limited resource in explaining a comprehensive concept of physical phenomena. As a consequence, it needs to incorporate a computer simulation which plays an important role in visualizing a wide range of complicated and abstract concepts. This study aims to develop a computer simulation of gas velocity measurement as a learning medium on the subject of Maxwell speed distribution. Measurement of very small and un-naked eye gas particles requires special techniques and tools that involve a complicated process of selecting particles and measuring their speed. For learning purposes, this measurement process needs to be done by computer simulation as in real lab it still face many limitations. This research uses the ADDIE model which includes analysis, design, development, application and evaluation. The results of the simulation show that: the velocity of gas particles passing through gaps ∆y is not a single velocity but has a certain range (v min - v max), a decrease in angle of two gaps and its width causes a decrease in the speed range, data of particle-s number when angular velocity of disks are varied from 0-100 units shows conformity with Maxwell-s velocity distribution graph which was obtained theoretically.

Keywords
learning media, computer simulation, gas velocity measurement, Maxwell speed distribution

Topic
Physics Education

Link: https://ifory.id/abstract/QpEDjC63AwRB

Corresponding Author
Meibi Lestari Gusti Pratama

Institutions
Departement of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu
Jl. W.R Supratman Kandang Limun 38371 A Bengkulu, Indonesia

Abstract
SnO2 nanoparticles are the materials that have many advantages physically and chemically, therefore they have been applied in many fields such as photocatalysts, gas sensors, dye sensitized solar cells (DSSCs) and lithium batteries which were all strongly influenced by the morphology, especially the formation of aggregates. This aggregates can be reduced by using the capping agents such as synthetic and natural compounds using the hydrothermal reaction. In this research, SnO2 nanoparticles were synthesized by green hydrothermal synthesis at relatively low temperatures using sucrose as the capping agent to reduce the aggregate formation. The effect of sucrose concentration as the capping agent on the SnO2 nanoparticles properties was examined using X-Ray Difraction (XRD) and Scanning Electron Microscope (SEM). The XRD pattern obtained, showed that the variation of sucrose concentration give a significant effect on the SnO2 nanoparticles properties. While the SEM analysis also showed that the sucrose concentration greatly affects the aggregates formation and the porosity of SnO2 nanoparticles. This result shows that the optimization of sucrose concentration in green synthesis of SnO2 nanoparticles could be used as an alternative way to control the crystallinity and morphology of SnO2 nanoparticles.

Keywords
Nanoparticles, SnO2, Capping agent, Sucrose.

Topic
Chemistry

Link: https://ifory.id/abstract/AYQRycHMVw9p

Corresponding Author
Nurwiyoto Nurwiyoto

Institutions
Bengkulu Muhammadiyah University (UMB), Education Doctoral Program Student UNIB

Abstract
This study aims to determine the type of rattan producer resin jernang, examines the growth habitat, jernang utilization, conservation efforts, and the process of inheritance jernang rattan knowledge to the next generation in Bukit Mangkekal, Village House Sako Village Kaur District, Bengkulu Province. Data collected by library research techniques, in-depth interviews, direct observation, and documentation. Jernang rattan made herbarium samples and identified in Bogoriensis LIPI Bogor Herbarium. The data were analyzed descriptively. The research found jernang quality rattan species namely Rattan Jernang Pulut (Daemonorops didymophyla). Habitat rattan jernang found growing in the valley and in the area around the overflow of river water, which is close to the trees to propagate. The ecological benefits of rattan jernang is subdued condition of the forest, the economic benefit is the price at the rate sap jernang local farmers between Rp. 500,000.00 - 1,000,000.00 USD per kilogram, medical benefits are as a cure wounds, toothache, medicine after childbirth, while the industrial benefits are as dye lacquerware, ceramics, tools of stone, wood, rattan, paper, paints, and pharmaceuticals. Resin jernang most sought after in the natural forest, and started there were cultivated in the community garden. Jernang fruit processed by extraction to obtain a resin, and sell them to buyers in the village. The conservation efforts are constrained by the ever-expanding land use change, jernang fruit pemanenen system unsustainable, lack of knowledge and jernang cultivation technology, and lack of public knowledge about the quality jernang. Inheritance rattan knowledge jernang done by parents to their children and the Chairman of the indigenous communities. The results of this study can be used as material in conservation education in the community and in the schools sustainability efforts jernang Rotan.

Keywords
Resin Rattan Jernang, Conservation Education, Ethnobotany Jernang

Topic
Biology Education

Link: https://ifory.id/abstract/f2pyK4bzA3hk

Corresponding Author
Desi Andriani

Institutions
Postgraduate Mathematics Education, Universitas Bengkulu, Jl. W.R. Supratman, Bengkulu 38371 Indonesia

Abstract
Mathematics was a difficult subject for students. A learning approach was needed that makes students learn meaningfully. This was an approach based on local culture and personality. The personality approach was a balance between worldly values and religion. The purpose of this study was to examine the contribution of learning approaches and school culture to the ability to understand mathematical concepts of students of TERPADU Islamic Schools in Bengkulu, Indonesia. The learning approach was "TERPADU" (Study, Elaboration, Formulate, Presentation, Application, Worldly, Ukhrowi). This was a survey research. The sample was chosen randomly from 120 students, from all students of Integrated Islamic Schools in Bengkulu as a population. It involves three latent variables, namely the learning approach, school culture, and the ability to understand mathematical concepts. The research instrument was a test of the ability to understand mathematical concepts, and two questionnaires. Both were learning approach questionnaires, and school culture questionnaires. Data were analyzed using Structural Equation Modeling and Confirmatory Factor Analysis. The results of this study were that the reliability of the learning approach variables, school culture, and the ability to understand mathematical concepts produce good values. All three variables have good consistency. There were 27% contribution of learning approaches to the ability to understand mathematical concepts, and the contribution of school culture was 23%. The conclusion was that there was a positive direct effect of the learning approach on the ability to understand mathematical concepts. Also, there was a positive direct effect of school culture on the ability to understand mathematical concepts. The "TERPADU" approach and school culture make a positive contribution to the ability to understand mathematical concepts.

Keywords
TERPADU approach, school culture, understanding mathematical concepts

Topic
Mathematics Education

Link: https://ifory.id/abstract/V8qQ94DAe3E7

Corresponding Author
Efuansyah Efuansyah

Institutions
STKIP PGRI LUBUKLINGGAU

Abstract
This study aims to describe the mathematical critical thinking skills of class VIII students through the development of Student Worksheets based on the Missouri Mathematics Project learning model using Think Talk Write strategies. This research was conducted at junior high school number 11 Lubuklinggau in the Even semester of the 2018/2019 school year with research population were all students of class VIII at junior high school number 11 Lubuklinggau. Data collection technique used was a test technique to measure students critical thinking skills on the material of Cubes and Cuboid. While the data analysis uses descriptive qualitative analysis. Based on the results of data analysis, it was found that the average percentage of students thinking abilities in class VIII was 76.97 and was in the Good category.

Keywords
Critical Thinking Ability, Missouri Mathematics Project Learning Model, Think Talk Write Strategy

Topic
Mathematics Education

Link: https://ifory.id/abstract/FQM7ugbR24cW

Corresponding Author
Rendy Wikrama Wardana

Institutions
(a)*. Science Education Program, Universitas Bengkulu, Bengkulu, Indonesia
(b). Science Education Program, School of Postgraduate Studies, Universitas Pendidikan Indonesia, Bandung, Indonesia
(c). Department of Physics, Faculty of Information Technology and Sciences, Parahyangan Catholic University, Bandung , Indonesia

Abstract
Some previous research have showed that Physics concept has abstract characteristic, difficult, and complex. This characteristic causes the students to have knowledge, understanding, and various conceptions. Students- various conceptions in Physics learning causes the emergence of discrepancy between alternative and scientific conception called as Intermediate conception. This research aims to description of intermediate conception in learning Physics. This research was qualitative research with literature review design. Data collection was conducted by collecting some literatures either articles or books related to intermediate conception. Data analysis was done by conducting analysis and articles and books synthesis and then drew a conclusion. The research results show that intermediate conception can be described as the conception between alternative conception and scientific conception which represent the pieces of ideas or concepts that have lead to science. Intermediate conception can be categorized into; naive physics, phenomenological intermediate primitives, lateral intermediate conception, and ontological intermediate conception.

Keywords
Intermediate Conception, Learning Physics

Topic
Physics Education

Link: https://ifory.id/abstract/MeqTP43FU9zk