Indonesia Conference Directory

Corresponding Author
Ardi Ardi

Institutions
Universitas Negeri Padang

Abstract
Biology learning requires students to carry out observations in practicum activities to form of concept understanding. Based on the observations in class XI of SMAN 3 and SMAN 7 Padang, it was found that the school had carried out practicum activities, but students had difficulty in practicing, especially plant tissue. They did not find clear observations, less skilled in using microscopes and making plant preparations. In the other hand some microscopes had moldy lenses, and the unavailability of practical guidance media that contained photographs of plant tissue observations slashed manually, so that the plant tissue observations carried out did not go smoothly. This development research using tree stages from the 4D development model, namely definition, design and development. The research subjects were 28 students, one teacher, and two lecturers. The instruments were used interview guides, validity and practicality questionnaires. Based on research conducted, have been produced Plant Tissues Atlas for SMA / MA. The validity test results obtained an average value of 3.73. with very valid criteria from the aspects of the appropriateness of content, language and readability, and presentation. Practicality test results obtained an average value of 3.81 with very practical criteria by teachers and 3.65 with very practical criteria by students in terms of learning activities, ease of use, and benefits of use. Based on these, it can be concluded that the Plant Tissues Atlas developed is very valid and very practical

Keywords
Atlas, Plant Tissue, Development Research

Topic
Biology Education

Link: https://ifory.id/abstract/U8GhT39bvJVZ

Corresponding Author
Duden Saepuzaman

Institutions
Universitas Pendidikan Indonesia

Abstract
This research is motivated by findings related to the understanding of the basic physics concepts of prospective physics teacher students that demonstrate the conceptual difficulties of Basic Physics course. The existence of these findings is the basis in determining alternative solution plans that support the achievement of more optimal learning outcomes, one of which is the development of Pre-Class Tutorial (PCT). The method used is descriptive . As many as 82 third semester students in the Physics Education Study Program were involved in collecting research data. Improved understanding of concepts is identified from the average achievement of student scores on the Basic Physics unit test I. The research findings indicate the use of pre-class tutorials can help improve the understanding of Physics concepts of prospective Physics teacher.

Keywords
Pre-class tutorial, Understanding Concept, Prospective Physics Teacher

Topic
Physics Education

Link: https://ifory.id/abstract/hu3bQcJW9jKH

Corresponding Author
Dony Susandi

Institutions
(a) Industrial Engineering, Majalengka University
(b) Mechanical Engineering, Majalengka University
Jl. KH. Abdul Halim No. 103 Majalengka 45418, Indonesia
*dys[at]unma.ac.id

(c) Physics Education, Indonesia University of Education
Jl. Setiabudi 229 Bandung 40154, Indonesia

Abstract
This research aims to develop scientific literacy instruments in the direct current series chapter. The measured aspects of scientific literacy are aspects of content knowledge, procedural knowledge and scientific attitudes. The research method was conducted with a qualitative and empirical analysis approach. Qualitative analysis is carried out by experts/content experts to examine the items. Empirical analysis is used to measure the feasibility of the instrument in the form of validation, reliability, differentiation test and convenience test. The sample used to measure the feasibility of research results is the second semester informatics student at Majalengka University. The results of expert studies/experts on the item shows that it is appropriate, as well as the results of empirical tests showing that the scientific literacy instrument developed in the direct current electricity chapter is feasible to be applied in learning.

Keywords
Instrument development, scientific literacy, direct current electricity

Topic
Physics Education

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

Corresponding Author
rizky rachman rachman

Institutions
Computer Science Education Department
Faculty of Mathematics and Science Indonesia University of Education
Bandung, Indonesia

Abstract
The Industrial Revolution 4.0 is characterized by the use of intelligent technology in the Industrial field. The use of smart technology in education is an impact on Industry 4.0. SMART Education is an intelligent technology-based education system innovation in the era of the industrial revolution 4.0. Smart Education offers education system innovation solutions based on smart learning environments, methods and evaluation of learning. Developed countries are competing to realize their smart education education innovations. The Smart Education project has been carried out globally in recent years. The Smart Education project began in Malaysia 1997, Singapore 2006, Finland 2011, Australia 2012, South Korea 2012, United Arab Emirates (UAE) 2012, and New-York 2014. This research aims to develop a smart education education service system to realize Education 4.0. Development of smart education education service systems is built based on service engineering methods, Service-Oriented Architecture (SOA) architecture and Web Services technology. The development of a smart education education service system consists of 4 (four) main problems, namely: 1. The model of learning services for Smart Education; 2. Application of service computing technology for Smart Education, 3. IT service architecture for Smart Education, and 4. Analysis and optimization of Smart Education service systems. Smart Education prototype test results can improve the education service system.

Keywords
Education 4.0, Industrial Revolution 4.0, Smart Education, Service-Oriented Architecture, Service Engineering

Topic
Computer Science Education

Link: https://ifory.id/abstract/PDWEq2nyxwYk

Corresponding Author
Jessie Manopo

Institutions
a) Department of Physics Education, Indonesia University of Education
Jalan Setiabudi 229, Bandung 40154, Indonesia
*jessiemanopo[at]upi.edu
b) International Program on Science Education, Indonesia University of Education
Jalan Setiabudi 229, Bandung 40154, Indonesia
c) Department of Physics, State University of Jakarta
Jalan Rawamangun Muka 1, Jakarta 13220, Indonesia

Abstract
21st-Century Skills are such essential skills to be prepared for professionalism needed nowadays. Therefore, in some developed and developing countries, education curricula were more emphasizing to exercise these skills. However, to achieve this objective, we have to build a standard assessment test to make sure that students have accomplished these skills. The skills should relate to laboratory problem solving, and the test has to be integrally connected to laboratory activities. This research attempted developing a set of 21st-century skills test tested to some teachers in Jawa Barat with a sample of 45 teachers. They have been teaching physics subject for more than five years. The problems presented refers to the design standardized by the National Assessment of Educational Progress (NAEP). The test consisted of 10 questions involving the concept comprehension test, and 16 problems involving 21st-century skills test with the rubric developed by Suzie Boss. The test was designed using Edmodo and Moodle platforms. The research result showed that the ten problems involving concept comprehension have high validity, 0.628. As the 21st-century skills test, there are some problems not validated, such as the critical thinking skills related to criticize a result. Moreover, communicating skills test about an issue to explain the project description, the additional feature about question to be spoken was required for kids who possess the auditory learning style. The collaboration and creativity skills test problems have been validated well. Therefore, some problems on this proposed standard test should be further improved by providing the video-based experiments, the scientific illustration regarding physical phenomena, the laboratory experiment data, and the scientific articles.

Keywords
21st-century skills, online test

Topic
Physics Education

Link: https://ifory.id/abstract/YNH4TbpKQM9X

Corresponding Author
Deni Martin

Institutions
Universitas Pendidikan Indonesia

Abstract
This research study about lack of information that can be conveyed by schools about student attendance to they parents and study about conventional attendance documentation process. The purpose of this research is: (1) design and build a student attendance reporting application using whatsapp gateway for parents to control of their kids and can help users in the presence process. The development model used in this study is prototyping which consists of stages: (1) Listen to customer, (2) Build revize mock-up, (3) Customer test drive mock-up. Data collection techniques using TAM (Technology Acceptance Model) and using the rating scale as a calculation method, with the results of the research is: The level of eligibility of student attendance reporting systems reviewed by aspect perceived usefulness is 86% with a very good category, Perceived Ease of Use of 90% with very good category, Behavioral Intention is 90% with very good category, Actual use is 90% with very good category, Attitude Toward Using is 90% with very good category, with an average rating is 89%. from the result of eligibility level shows that the student attendance reporting system can help user to make a presence process and worthy for use

Keywords
student presence, presence system, Android, Technology Acceptance Model, prototyping

Topic
Computer Science Education

Link: https://ifory.id/abstract/MXBvgqAnuz9j

Corresponding Author
Vita Oktaviani

Institutions
Sekolah Pascasarjana Universitas Pendidikan Indonesia
Jl. Dr. Setiabudhi No.229, Bandung 40154, Indonesia
*oktavianivita[at]upi.edu

Abstract
Textbook is one of the important components in the learning process. Textbooks should be able to facilitate abilities and practice the skills students must have in the 21st century. The purpose of this study was to develop textbooks using multimodal representation to provision scientific literacy, communication and collaboration skills on the topic of Sound and Light. The research method used is Research and Development according to Borg and Gall. The instrument used in this study was a quality test questionnaire and a test of comprehension of the main ideas. Based on the test results of the main ideas of the discourse in the developed textbooks obtained 70.8% results with a high level of understanding in the category and the average value of the percentage of the quality test of the textbooks of each component by the validator obtained an average result of 86.7% with a very decent category. The results of the study of the feasibility of the textbook were 78.7% with a decent category. Based on the result of study, it could be concluded that the textbooks developed are suitable to be used as physics textbooks in senior high school.

Keywords
Textbook, Multi Modal Representation, Sound and Light

Topic
Physics Education

Link: https://ifory.id/abstract/wdJ6Ly4MzrjT

Corresponding Author
Ria Triayomi

Institutions
(a) Department Of Teacher School Education Teacher, Catholic Musi Charitas University,
Jalan Bangau No.60 Palembang 30113, Indonesia
(b) Department Of Psychology, Catholic Musi Charitas University,
Jalan Bangau No.60 Palembang 30113, Indonesia

Abstract
This research aims to produce a valid and practical barcode-based three-dimensional learning media for primary schools and have the effectiveness on learning outcomes in learning Science. The module based on website was developed through three stages, namely needs analysis, design/planning stage, development and implementation stage. To view its validity had evaluated by experts, to look at its practicalities had used one-on-one evaluation and small groups- evaluation, while to look at the effective had used field test and student-s activity. The results showed that the evaluation of experts amounted to 4.27 with very valid criteria, the results of questionnaires student response data showed an average of 76%. Learning outcomes with score gain score of 0.78 with high category. Students activity is 85.4% with very good criteria. The development of three-dimensional based learning media developed has been valid, practical, and has effectiveness on student learning outcomes and activeness.

Keywords
Three Dimensional Learning Media, Barcode Based, Elementary School.

Topic
Computer Science Education

Link: https://ifory.id/abstract/n7UazAdPmFvW

Corresponding Author
Heni Rusnayati

Institutions
Universitas Pendidikan Indonesia

Abstract
Abstract. Preliminary studies carried out using the Respondent Ability Test (RAT) identified that students experienced obstacles in: light refraction material on the lens that is determining the type of lens, focal length, lens strength and problem solving in shadow formation by 99%, unable to apply the impulse concept 97.14%, unable to connect to the planetary revolution with the distance of the planet to the Sun by 92.1%, unable to apply mathematical equations to the inclined plane of 100%. Learning obstacles that occur in students can affect the learning process and student learning outcomes.One effort to overcome the learning barriers experienced by students is by compiling a learning based learning barrier on students. Based on this, research was conducted aimed at minimizing student learning barriers through didactical design research (DDR). In designing DDR, epistemology obstacle analysis was carried out through tests of respondents abilities with research methods using qualitative descriptive. The stages of DDR research go through three stages of analysis, namely didactic situation analysis, metapedadactic situation analysis and retrospective analysis. Design that has been designed is implemented in class XI and class X high school in the city of Bandung. Data analysis that has been done shows that didactic design that has been implemented can minimize student learning barriers.

Keywords
didactic design, learning barriers, qualitative descriptive

Topic
Physics Education

Link: https://ifory.id/abstract/Vfxdk6LZtCGb

Corresponding Author
Rattila Arinal Haque

Institutions
Department of Physics Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia, Bandung, Indonesia.

Abstract
Abstract. This didactic was designed based on the results of students responses to scientific literacy (SL) competencies. Some of the student-s low responses related to the competencies of explaining scientific phenomena in aspects of building hypotheses,competencies in evaluating and designing the research results on aspects of exploring inquiry questions and competencies of interpreting data and evidence scientifically on the aspects of analyzing and interpreting data and drawing right conclucion. Marzanos learning dimension has five dimensions that are closely related to training scientific literacy (SL) competencies and the reading infusion is chosen so that students have supporting knowledge for the learning process. Didactic design focused on studying momentum related to determining the velocity of the center of the particle system, in order to prove the validity of momentum conservation law, and the relation between rocket speed and emitted gas. The experiment has been tested in the laboratory so it is possible to build tasks and right didactics design, so that students have a positive perception in facilitating scientific literacy (SL) competencies.

Keywords
Keywords: Scientific literacy competency,dimensions of Marzano learning and reading infusion.

Topic
Physics Education

Link: https://ifory.id/abstract/c3E8PVkX26Kd

Corresponding Author
agus winarji

Institutions
(a) Mathematics Education, School of Postgraduate Studies, Indonesia University of Education, Jl. Dr.
Setiabudi No. 229, Bandung 40154, Indonesia
*E-mail: agus.winarji[at]upi.edu
(b) Mathematics Education, School of Postgraduate Studies, Indonesia University of Education, Jl. Dr.
Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
A study conducted to analyze the didactic transposition process on the concept of central angle and circumferential angle in junior high school. This research is a hermeneutic phenomenology research. Geometry textbooks, the 2013 curriculum and junior high school mathematics textbooks analyzed were the data sources in this study. Descriptive analysis is used to analyze the didactic transposition process. The results of this study indicate that there is no structural change in the concept of the central angle and the circumferential angle from scholarly mathematics to school mathematics. But there is a change in form in the concept of the central angle and the circumferential angle from scholarly mathematics to school mathematics. In school mathematics, the concepts presented are contextual, concrete and simple. While in scholarly mathematics, the concepts presented are abstract. This change in form adjusts the level of cognitive development of students.

Keywords
didactic transposition, central angle, circumferential angle

Topic
Mathematics Education

Link: https://ifory.id/abstract/wcTPdLmfAj8D

Corresponding Author
Nanang Diana

Institutions
(1,2) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
(1)STKIP Taman Siswa Bima, Jl. Pendidikan No.01 Palibelo-Bima

Abstract
This study aims to formulate an alternative learning design related to the concept of circle equations and tangents to analytic geometry learning through student learning obstacle. This is descriptive qualitative didactic design research (DDR) by identifying the learning obstacle of students obtained equations of circular equations and tangents of circles, then compiling pedagogical didactic anticipations through identified learning obstacle. This research subjects is the sixth semester students of analytic geometry courses. Data collection was carried out using documentation, interview, test and questionnaire techniques. The results showed an alternative didactic design that could be used in learning equation of circles and tangents of circles and was able to facilitate students as a source of support for learning activities.

Keywords
Didactical Design,Circle Equation and Tangent of Circle, Learning Obstacle.

Topic
Mathematics Education

Link: https://ifory.id/abstract/b7wZXJeygnhH

Corresponding Author
Mimi Nur Hajizah

Institutions
Universitas Pendidikan Indonesia

Abstract
This research aims to develop a didactical design of learning about circle at junior high school, especially the relationship between central angle, length of arc, and area of segment of the circle. Developed didactical design consists of three activities obtained from three formal stages during the research process. The first stage is the analysis of the didactical situation before learning to obtain a hypothetical didactical design. Preparation of hypothetical didactical design is preceded by a preliminary study which includes the identification of obstacles student learning as well as the theoretical analysis and repersonalisasi. Identification of learning obstacle is conducted at a junior high school in South Jakarta involving 34 students of class IX by analyzing the results of the students answers on the questions provided, analyzing the results of interviews of teachers and students, as well as analyzing the textbooks used at the schools. The second stage is the analysis metapedadidaktic which is reflected in the design implementation. Design implementation is conducted at junior high school where a preliminary study done involving 36 students of class VIII. The third stage is the stage of reflection by conducting a retrospective analysis. This is done in order to obtain information for a revised design to produce empirical didactical design. The developed empirical didactical design allows for further development through the three stages of the same formal.

Keywords
Didactical Design , Learning Obstacles , Circle, Central Angle, Length of Arc, and Area of Segment

Topic
Mathematics Education

Link: https://ifory.id/abstract/rDQxvN8ktKyG

Corresponding Author
feri sulianta

Institutions
Universitas Pendidikan Indonesia

Abstract
The growth of information technology in Industry ver 4.0 became the enabler of the digital literacy. Todays‘s Internet services is widely used to provide and to distribute information to the society. However, there are many challenges when implementing digital literacy and practicing it for students and society, increase the awareness of information and becomes digital literate. The presence of technology requires a different approach, compared to traditional or non-digital products. For example, reading and writing digital content, the used of devices ,content management are different. Good digital content should be made with a digital mechanism. But in contrary, most people created it by digitizing traditional content and published on the internet. This is happened because there has been no standard in making digital content model in creating digital content that contributes to digital literacy. For this reason a digital content model based on Social Studies Education is made to create the virtue of digital content. The digital model based on Social Studies Education is developed using research and development methods. The digital content model in this research is made to enabler society to be critical thinking and digital literate in the era of industry ver 4.0.

Keywords
Digital Content Model, Social Studies Education, Literacy, Information Technology, Research and Development, Industry 4.0, Digital Literate

Topic
Integrated Science Education

Link: https://ifory.id/abstract/Rwa6vprNY8A7

Corresponding Author
Rani Megasari

Institutions
Departement of Computer Science Education
Universitas Pendidikan Indonesia
Jln. Dr SetiabudhiNo.229 Bandung 40154 INDONESIA

Abstract
This resreach is motivated with problem of student who cheat while exam that reflect to their integrity. Cheating can interfere evaluation process. Exams that use computer/smartphone are still many using multiple choice question that are not same as using paper based that has more variation type of question, especially essay question, so a systes was made for essay type question. One of method that can be use for essay scoring are term frequency, n-gram, and cosine similarity. Concept of the methode are comparing keyword answer as query and student answer as document then get score of student answer. This method can also be use in other way, that is comparing ansewers between students where the result is score of similiarity student answers. Student answers that have 75% similarity will be considered by system as cheating which is expected to prevent cheating and increase student integrity. To test this system, experiments where conducted on student behavior when they knowing the system can only assess the answer and student behavior when they knowing the system can find out shich students are cheating. The result of experiment are: (1)This Resreach produced a system for exam with essay type. (2) Result of scoring student answer get the Mean Absolute Error (MAE) of 10.101 in the pre-test and 6.297 in the post-test and Pearson Correlation Coefficient Result of -0.0283 in the pre-test and -0.0286 in the post-test. (4) Result of system implementation on student integrity get a value of 60.588% in the pre-test and 88.235% in the post-test. But the number of students with similar answer are increased from 45 answers in the pre-test to 51 answers in the post-test.

Keywords
Evaluation, Term Frequency, N-Gram, Cosine Similarity, Exam, Student Integrity, Student Cheat.

Topic
Computer Science Education

Link: https://ifory.id/abstract/WD2G89VpqUE3

Corresponding Author
Dedi Mulyadi

Institutions
Puslit Geoteknologi LIPI

Abstract
Dolomite minerals are currently widely used for a variety of uses, including fertilizers, glass mixtures, as materials for making cement, necessary elements for making ceramics, etc. Research on the composition of dolomite in rock gaming of the Wonosari Formation, Gunung Kidul Regency, Central Java. The method used in this study is petrography and AAS. The results of the petrographic analysis showed that the presence of small amounts of dolomite while the AAS analysis also showed the presence of not too little (little) dolomite. Conclusion Dolomite contained in the Wonosari formation is not too dominant; at present, the exploitation for dolomite minerals continues to be carried out with open mining methods. Conclusions from this study Dolomite wonosari Formation is not well used both for fertilizer and cement materials because the composition is only 3%

Keywords
Composition of dolomite, Wonosari Formation. dolomit percentage

Topic
Physics

Link: https://ifory.id/abstract/hyYUr2AwNqcG

Corresponding Author
Amalia Nurlatifah

Institutions
a) Center of Atmospheric Science and Technology, National Institute of Aeronautics and Space

Abstract
Climate change is a change in weather patterns over a long period of time and can lead to increased frequency of hydrometeorological disasters. This study aims to see the potential for drought in Cilacap based on the results of the CCAM model projections with the RCP 4.5 scenario due to climate change. The method used is the CCAM modeling method, the validation of rainfall data from CCAM output with observation data using the correlation and RMSE methods, and determining the incidence of drought with the SPI (Standardized Precipitation Index). Based on the simulation results, rainfall data from CCAMs output in 2006-2014 showed good performance with a correlation value of 0.8 and RMSE 61 value compared with the average rainfall observation that reached 270. When this data was used as input for calculating drought conditions CCAM data is also seen as quite capable in estimating drought conditions in Cilacap when compared with data from BNPB. Therefore the CCAM data and the SPI method are quite capable of explaining the conditions of drought in Cilacap. Based on the projected data from CCAM and the SPI drought calculation method, in the period of mid-2019 to 2020 is estimated that Cilacap will be in a normal condition and there will be no drought or extreme wet conditions.

Keywords
Drought; CCAM; RCP 4.5; SPI

Topic
Physics

Link: https://ifory.id/abstract/uWPXRy23rUV9

Corresponding Author
Cahyo Puji Asmoro

Institutions
Universitas Pendidikan Indonesia

Abstract
This study was conducted to determine the effect of Ipomoea batatas L. leaf extract as flocculants on the reduction of Ca2 + and Mg2 + (hardness) levels in water treatment for chemical practicum on environmental analysis at the FPMIPA UPI Chemical Department. This study continued from previous research on the optimization of Ipomoea batatas L. leaf extract as a flocculant in water treatment, the results of the study showed that Ipomoea batatas L. leaf extract can make water clearer and provide greater reduction in turbidity value. In this follow-up study it will be carried out through two stages, the first step is optimizing the optimum processing parameters. The second stage is water treatment using optimum processing parameters, followed by hardness testing in water samples before and after processing. In hardness testing the EDTA titration method is used with the EBT indicator. The results showed the optimum parameters of water treatment with Ipomoea batatas L leaf extract as flocculant was pH 6.5, coagulant dose 50 mg / L, flocculant dose 2 mg / L, stirring coagulant speed 200 rpm for 5 minutes, and flocculant stirring speed 40 rpm for 5 minutes. In testing the total hardness as CaCO3, the initial sample (without treatment) obtained hardness of 285 mg / L, whereas in the sample treated with Ipomoea batatas L. leaf extract as flocculant hardness was obtained at 190 mg / L. From the results of the study it can be concluded that Ipomoea batatas L. leaf extract as flocculant in water treatment can reduce the hardness level in water.

Keywords
Biofloculan, Ipomoea batatas L., EDTA titration, Hardness.

Topic
Chemistry

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

Corresponding Author
Waslaluddin Waslaluddin

Institutions
UNIVERSITAS PENDIDIKAN INDONESIA

Abstract
Abstract. Silicon Oil, which is commonly used in vitreoretinal surgery, is known as Polydimethylsiloxane (PDMS). Silicone oil is used as a substitute for vitreous humor in vitreoretinal surgery. Silicone oil is needed in Indonesia and must be produced with sufficient quality and quantity for domestic needs, currently vitroretinal surgery still uses silicone oil imported from abroad. In this study, PDMS has been synthesized using an addition polymerization process with a polymerization chain growth mechanism, with the monomer octamethylcyclotetrasiloxane, the initiator of Pottasium Hidroxida and the hexamethyldisiloxane chain terminator. The duration of mixing varied from 20 minutes, 30 minutes and 40 minutes, to study the effect of time on PDMS characteristics. The PDMS synthesis we produce is between 65.30% and 86.71% with various viscosities in the range of 900 m.Pa.s and 5000 m.Pa.s. FTIR spectroscopic measurements were found that all synthesized samples were found to have functional groups and structures similar to commercial silicon oil. UV-Vis and refractometer measurements, all samples have transmittance close to 100% and refractive index between 1.3589 and 1.4059. The effect of the length of time on the PDMS gel is on the viscosity the longer the mixing time the higher the viscosity, this mixing occurs at 170oC, stirred using a magnetic stirrer with 300rpm and the concentration of 1M Pottasium Hydroxide. In this study the propagation stage to form a gel began to form in 20 minutes.

Keywords
addition polymerization, chain growth mechanism, polydimethylsiloxane

Topic
Physics

Link: https://ifory.id/abstract/LxjV9tmXfaE7

Corresponding Author
Noverita Dian Takarina

Institutions
Department of Biology, Faculty of Mathematics and Natural Science, University of Indonesia, Depok

Abstract
The Sea Surface Temperature (SST) is known as one of prominent factors affecting the concentration of metals in the marine environment. Hence, this research is aiming to study the effect of SST on Zn content distribution in the seawater of Blanakan coast. The Zn was measured from sampled seawater collected from 7 stations. Those stations were representing inshore and offshore of Blanakan coast. The sampled water then analyzed by AAS to obtain the Zn contents. The result confirms a positive effect of SST on Zn contents (r2 = 0.18). An increase of SST from 25 to 31 0C was followed by increase of Zn in seawater from 0.31 to 0.50 mg/l of water. Respectively, all Zn values in Blanakan coast have exceeded the permissible limit of EPA (0.09 mg/l for seawater). The effect of SST on the Zn contents is observed in the offshore rather than inshore water of Blanakan coast. This research also presents a 12 month Zn prediction. Following the SST fluctuation, it is predicted that Zn in seawater will be higher in February-May and lower in July-September.

Keywords
Coast; Metal; Offshore; Sea Surface Temperature; Inshore

Topic
Biology

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

Corresponding Author
Heli Siti Halimatul Munawaroh

Institutions
UPI

Abstract
Chlorella vulgaris and Navicula salinicola have been reported to have high lipid content and are potential to be used as an alternative source of bioenergy precursor compounds. However, to obtain a high biomass and lipid with autotropic cultivation condition is still a challenge therefore other cultivation condition such as photoheterotropic need to be explored. In addition, the influence of cultivation conditions on the production of biomass and lipid for diatomic microalgae, especially Navicula salinicola, is still rare explored. This study aims to analyze the effect of organic carbon sources namely sugarcane addition on the production of biomass and lipid of Chlorella vulgaris and Navicula salinicola. Analysis of biomass concentrations is evaluated by measuring dry cell weight (DCW), while lipid concentrations is evaluated by measuring total lipid levels from the extraction results using the Folch method. Lipid concentrations is calculated based on total lipid levels and biomass concentration obtained. The profile of fatty acid methyl ester (FAME) is analysed by using GC-MS. Based on the results of this study, it was observed that addition of sugarcane as an organic carbon source has increased the biomass production in Chlorella vulgaris and Navicula salinicola by 50.10% and 69.40% respectively than those are cultivated without the addition of sugarcane. Similarly, the addition of sugarcane has been showed to induced lipid accumulation in Chlorella vulgaris and Navicula salinicola by 34,45% and 25,51% respectively compared to those are cultivated with carbon source from the air. On the other hand, the addition of sugarcane as an organic carbon has decreased the variations of fatty acid in Chlorella vulgaris and Navicula salinicola by 3 and 4 types respectively than those are cultivated without the addition of sugarcane. The addition of sugarcane can suppress the variations of fatty acids in Chlorella vulgaris and Navicula salinicola but it stimulates the synthesis of palmitic acid (C16:0) which has potential to be applied to the biodiesel industry.

Keywords
Biomass, Chlorella vulgaris, Lipid, Navicula salinicola, Photoheterotropic

Topic
Chemistry

Link: https://ifory.id/abstract/MUJgEXdnT2L7

Corresponding Author
Muhammad Yudhistira Azis

Institutions

1Analytical Chemistry Research Group, Institut Teknologi Bandung,
Jl. Ganesa 10 Bandung 40132 Indonesia
2Chemical Engineering Product Design and Development Research Group
Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, 40132 Indonesia

Abstract
Water contamination caused by dye industries, has caused more and more attention, since most dyes are harmful to human being and environments. Some dyes like methylene blue (MB) and their degradation products have carcinogens and toxic properties so that the removal of dyes from surface water or wastewater is very important. Physical adsorption using solid adsorbents has been a promising method for treating dyes, pigments and other colorant wastewater, owing to its advantages such as operational simplicity, low cost, availability in large amount and ability to treat pollutants in a sufficiently large scale operation. In this study, the sorption of MB from aqueous solution onto composite nanofiber under the influence of temperature has been investigated. It was observed that the amount of MB adsorbed increase with increasing temperature. Thermodynamic parameters data indicated that the MB adsorption process was non-spontaneous and endothermic under the experimental conditions, with the Gibbs free energy (?Go) in the range of 1.721-0.610 kJ mol-1, enthalpy (?Ho) and entropy (?So) of 7.24 kJ mol-1 and 18.52 J mol-1.K-1, respectively and the activation energy was 13.85 kJ mol-1.

Keywords
Effect of Temperature on Sorption of MB from Aqueous Solution using Composite Nanofiber

Topic
Chemistry

Link: https://ifory.id/abstract/A6GjpdNDzCwB

Corresponding Author
Maximus Tamur

Institutions
a) Doctoral Program in Mathematics Education, Universitas Pendidikan Indonesia Jl. DR. Setiabudi No 229, Bandung, 40154 Indonesia *maximustamur[at]upi.edu dan maximustamur[at]unikastpaulus.ac.id
b) Department of Mathematics Education, Universitas Pendidikan Indonesia Jl. DR. Setiabudi No 229, Bandung, 40154 Indonesia. dadang.juandi[at]upi.edu

Abstract
This meta-analysis study aims to investigate the effectiveness of the application of constructivism-based learning models to the mathematical creative thinking abilities of secondary school students in Indonesia. This study analyzes 33 studies that have been published in national and international journals from 2010 to 2019. Data were analyzed using CMA (Compherensive Meta-Analysis) software designed to determine publication bias and effect size. As a result of the study, the overall effect size was 0.884 according to the random effects model indicating that the average person ranked 13th in the experimental group, equivalent to those ranked 6th in the control group. The study was conducted by considering the variables of the study year, the level of the study school conducted, sample size and class, resulting in significant differences. Thus the application of constructivism-based learning models is very effective in improving students mathematical creative thinking abilities in Indonesia.

Keywords
Creative Thinking abilities, constructivist-based learning models, meta-analysis, mathematics education

Topic
Mathematics Education

Link: https://ifory.id/abstract/xBTRkhDZ3dvr

Corresponding Author
Sifak Indana

Institutions
a) Science Education Study Program, Master Program, Universitas Negeri Surabaya

Abstract
The purpose of this study was describing effectiveness rate of learning material by ICT-based Guided Inquiry Model in training critical thinking skill and science literacy junior high school student. Before being tested to junior high school students, the developed learning material was assessed by expert for the validity rate. It was known that the developed learning material was very valid. Then, the learning material was tested on 30 seventh-grade students of SMPN SATAP Kenduruan, Tuban, East Java, batch of 2017/2018. This data was obtained by critical thinking and science literacy test method. The result of this study showed that the average of pretest was 39.9 point (very less critical) and the average of posttest was 75.5 point (critical) by N-gain score was 0.7, categorized as high score. That result could explain us that critical thinking skill of students in SMPN Satap Kenduruan was increased, from very less critical to critical. So, it can be concluded that learning material by ICT-based guided inquiry model was effective for training critical thinking skill and junior high school students- science literacy.

Keywords
learning material; Guided inquiry model; ICT; critical thinking; science literacy; junior high school

Topic
Biology Education

Link: https://ifory.id/abstract/vLZ9Pau7WhqD

Corresponding Author
Madlazim Madlazim

Institutions
Universitas Negeri Surabaya

Abstract
A reliable method of detecting tsunami generation in the ocean for effective tsunami early warning requires rapid and accurate tsunami-discriminant calculations, which include rupture duration (Tdur), the duration exceeds 50 seconds (T50ex), and the dominant period (Td) of first P-wave arrivals extracted from seismic signals induced by earthquakes of varying magnitudes. In this context, this study is thus aimed to analyze the effects of M-filter implemented on the existing Tsunami Early Warning Application (Ina-TEWA) performance in terms of accuracy in determining such discriminants. A method of real-time experiments was developed in this study, where tsunami parameters obtained before and after M-filter implementation were analyzed for the number of false warnings issued. A total of 300 Indonesian events striking regions throughout the country with a range of magnitudes from 5.0 to 7.9 during 2018-2019 years were examined. The results showed that prior to M-filter installation 15 of all cases considered were falsely issued, confirming for a total of 95% assessment being adequately accurate. However, accuracy in the Ina-TEWA performance was found to improve as false alerts reduce to zero when M-filter was introduced, implying a 100% level of accuracy. Hence, the use of M-filter in the Ina-TEWA makes its performance better, providing with reduction in false warnings and hence improved accuracy.

Keywords
Keywords: M-filter, Ina-TEWA, improved accuracy, false warning, tsunami parameters

Topic
Physics

Link: https://ifory.id/abstract/MZKBU2dJHVcn

Corresponding Author
Setiya Utari

Institutions
Universitas Pendidikan Indonesia

Abstract
Nowadays, 21st-century skill is being considered as one of the educational policies in some developed countries to be well-trained at schools. The science, technology, engineering, and mathematics education (STEM) provides a high opportunity in exercising this skill to students. According to the national Indonesian curricula, it can be found that the students commonly must follow many subjects of course scheduled by a public school with relatively-difficult content. Based on our investigation, the difficulties might be handled by applying the engineering course model. The class can be conducted separately as an independent subject such as the basic technology education, which is provided as a special subject in a private school, or an extracurricular activity of students- science forum for whom interested to this subject. To facilitate a well-scientific activity, the model of engineering curricula is needed especially to train the 21th-century skill. Thus, this work has reported the survey of STEM education activities implemented at some middle schools, the interviews to some teachers who are responsible to the science subject, and the analysis of science subject contents in Indonesian curricula 2013 for the middle school level.

Keywords
The 21th-century skill, STEM education, Curriculum, Engineering course

Topic
Physics Education

Link: https://ifory.id/abstract/2wTnG6y4JaVd

Corresponding Author
Siti Khoiruli Ummah

Institutions
University of Muhammadiyah Malang

Abstract
Abstract— Blended Learning using Canvas became familiar method in 2019 because of the easiest access and the centralized system management in university. This paper aimed to describe the findings of case study focusing on the engineering students- participation and the creativity in implementation of flipped classroom method emphasizing group discussion and students- answer sheets. The findings were optimally reached from online group discussion, paper-based test, and online test using qualitative approach. The findings were surprised because the engineering students through flipped classroom were more active than in the classroom. There were more comment in group discussion and the answer from discussions- topic were vary. The discussion was more interactive because every students has different questions that must be answered by other students. The engineering graduated students could answered fluently and vary. The students- answer on paper-based test and online test were vary and all the questions was answered correctly. It could be said that flipped classroom optimally implemented so that change the students- participation and creativity significantly.

Keywords
Blended learning; Canvas; engineering students; flipped classroom; online group discussion; students- participations; creativity; mathematics engineering

Topic
Mathematics Education

Link: https://ifory.id/abstract/k3mAxzCa6GEr

Corresponding Author
Bety Miliyawati

Institutions
a) Universitas Subang
Jl. RA. Kartini KM. 03, Subang, Indonesia
*betymiliyawati[at]gmail.com

b) Universitas Pendidikan Indonesia
Jl. Setiabudi, Bandung, Indonesia

Abstract
This study aims to describe the enhancement of students mathematical literacy ability using the Problem Based Learning (PBL) model with Didactical Engineering (DE). The method used is quasi-experimental, with a pre-test post-test control group design research design. The population was all eighth grade students of state junior high schools in Subang regency and the sample involved as many as 105 students spread across two classes, namely the experimental class and the control class. The instruments used were tests of Prior Mathematical Ability (PMA) and mathematical literacy ability test. Research data for pretest, posttest, and normalized gain of students with mathematical literacy ability were analyzed quantitatively using t test, one way ANOVA, and two way ANOVA. Based on the results of data analysis, it can be concluded that there is a significant difference in the enhance in students mathematical literacy ability in terms of the PMA category and learning model, based on further tests of the most influential low and high PMA categories. Overall there are differences to enhancement in students mathematical literacy abilities between students who get PBL models with DE compared conventional models, and there is no interaction between learning models and PMA categories on mathematical literacy abilities.

Keywords
Problem Based Learning; Didactical Engineering; Mathematical Literacy

Topic
Mathematics Education

Link: https://ifory.id/abstract/aAxuGf6jWhPY

Corresponding Author
Muhammad Rizki Fauzi

Institutions
Department of Mathematics Education, Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia.
*mrizkif[at]upi.edu

Abstract
This study aims to investigate and analyze the enhancement of student-s mathematical abstraction, connection ability and persistence who taught by generative learning model. It employed quasi-experimental method with non-random pre-test and post-test control design. More specifically, it used the 2x3 factorial design, namely the learning factors that included Generative Learning Model and conventional teaching learning, and levels of prior mathematical ability (high, middle, and low). This study took a sample of 68 grade X (ten) students of a senior high school in Karawang, West Java. The instruments of this study consisted of mathematical abstraction test, mathematical connection test and mathematical persistence questionnaire. Quantitative data analysis were carried out by using t-test, Mann-Whitney U test, and two ways ANOVA with interaction. The results of this study show that: 1) student-s achievement and enhancement of mathematical abstraction and connection abilities who taught by Generative Learning Model were significantly higher than those of students who received conventional learning; 2) there is no interaction between learning models and prior mathematical ability toward the enhancements of mathematical abstraction and connection ability 3) Mathematical persistence of students taught by Generative Learning Model was also significantly higher than of those taught with conventional learning.

Keywords
Mathematical Abstraction, Mathematical Connection, Mathematical Persistence, Generative Learning

Topic
Mathematics Education

Link: https://ifory.id/abstract/H8gJR4p7Vtjk

Corresponding Author
Alfiansah Sandion Prakoso

Institutions
Universitas Pendidikan Indonesia
(*) irma.rs[at]upi.edu

Abstract
Creative Problem Solving (CPS) is a must-have skill that should be built and developed by the students to be able to compete in the 21st century. CPS is a process to solve a problem faced imaginatively and resulted an effective action. There are 4 aspects that is assessed in CPS which are fact finding, problem finding, idea finding, and solution finding. With an assumption that CPS could be trained and improved, this research aim is to investigate the enhancement of senior high school student-s CPS skill after practicing a STEM based learning. The topic in this research is the concept of momentum and impuls using LEGO® Mindstorm EV3 as the media. This study use a pre-experimental method with one group pretest-posttest design. The sample of this research is 25 senior high school students in Bandung that are determined with cluster random sampling technique. By analyzing the N-Gain, result shows that the enhancement of CPS skill is on the middle category with between 0.31 – 0.63

Keywords
STEM-Based Learning; Creative Problem Solving; LEGO® Mindstorm EV3

Topic
Physics Education

Link: https://ifory.id/abstract/v4GncuFw9eqH