Indonesia Conference Directory

Corresponding Author
Amaliyah Rohsari Indah Utami

Institutions
a) Engineering Physics, School of Electrical Engineering, Telkom University, Bandung 40257, Indonesia

Abstract
This research discusses a brief analysis about treatment of palm oil shell biomass by using physical treatment at different crushing pressure to examine the adequate size of particle for improving the heating value of briquette. The oil palm shell which was applied physical treatment at different crushing pressure of 400 Joule, 550 Joule, and 700 Joule, that resulted in particle size is smaller than 800 µm, 800 µm, 1700 µm, 2000 µm, and bigger than 2000 µm. The adequate size of particle for briquette was found to be 1700 up to 2000 µm, which reached heating value of 4696.2 cal.g-1.

Keywords
oil palm shell, briquette, particle size, remote area, energy

Topic
Bioenergy

Link: https://ifory.id/abstract/dC7FkU8v3aVA

Corresponding Author
tommy tanu wijaya

Institutions
IKIP Siliwangi

Abstract
Abstract. The purpose of this research is to know the effect of learning media on the junior high school students- critical thinking skills on the topic of plane geometry by using hawgent dynamic mathematical software. The sample of this research would be 9th grade student in one of the junior high school in Cimahi with a total of 30 students in the school year of 2019/2020. The collection of the data is by using pre-test and post test to compare the critical thinking skills of the experimental class with the controlled class. The result of this research is that hawgent dynamic mathematical software boost the students- critical thinking skills and also comparing the increase of students- critical thinking skills on the topic of plane geometry.

Keywords
Hawgent dynamic mathematical software, plane geometry, junior high school

Topic
Mathematics Education

Link: https://ifory.id/abstract/M8n92mdJLYNT

Corresponding Author
Encum Sumiaty

Institutions
Department of Mathematics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi no. 229, Bandung 40154, Indonesia

Abstract
According to study about convex function, A. W. Roberts and D. E. Varberg[17] have studied further. In this paper, we will introduce some basic properties about convex function and quasiconvex fucnction on R. Some comparison between properties of convex function and quasiconvex function will be presented also. Our results are quasiconvex function can be represented as monotone function either or at most as two combination of monotone functions, as consequences it is discontinuous mostly at countable points, and it is not differentiable at zero measure set only. However the results are still fundamental, but we will learn as clear as we can.

Keywords
Convex Function, Quasiconvex Function, Convex Function Space, Quasiconvex Function Space

Topic
Mathematics

Link: https://ifory.id/abstract/xtfe2AH6Trwz

Corresponding Author
Lukita Ambarwati

Institutions
Universitas Negeri Jakarta

Abstract
In this paper we will solve the interpolation problem on two dimension, that is given k points (xi,yi,ci), i=1,2,...,k, we will found continuous function U(x,y) such that U(xi,yi)=ci, i=1,2,...,k and U minimizing integral energy order N. The support points (xi,yi) did not have rectangular grid form. We will use tensor product of two Chebychev systems as a base of interpolation function space.

Keywords
Interpolation, Non rectangular grid form, Tensor product, Chebyshev Systems, Minimizing energy

Topic
Mathematics

Link: https://ifory.id/abstract/b6ADyqT7mJQZ

Corresponding Author
Munir Munir

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

Abstract
The background of this research is due to problems in learning computer systems at school. The purpose is to find out the improvement of students cognitive aspects by applying a cooperative script method assisted by interactive multimedia on the subject of computer system. The method used is an experimental method with a quasi-experimental form. The research design used is a nonequivalent control group design. Before conducting the research, the multimedia was validated first by the expert of material and the expert of multimedia. Based on the data processing, the result are 1) the improvement of cognitive aspect in a control class has a gain index 0.37, while in the experiment class is 0.78. 2) The multimedia has a good response from the students and reached the percentage of 78.51%.

Keywords
Cooperative Script, cognitive aspects, interactive multimedia

Topic
Computer Science Education

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

Corresponding Author
siti chotimah

Institutions
IKIP SILIWANGI

Abstract
This research is motivated by still have low ability of students mathematical understanding and lack of student independence in learning mathematics, to overcome these problems it is necessary to have an approach in learning. The alternative approach applied is the realistic mathematic educations approach. This study aims to determine and examine the mathematical understanding ability of junior high school students in one school in Cimahi. The research method used was experimental method in the form of pretest-posttest control group design. The population in this study were all seventh grade junior high school students in Cimahi, while the sample was seventh grade junior high school students in one of the Schools in Cimahi representing population characteristics. The data collection in this study uses a test type description and non-test that is a questionnaire. Then the data is processed using SPSS-16 and Microsoft Excel. Based on the results of the study it can be concluded that the mathematical understanding ability of junior high school students whose learning uses the Model-Eliciting Activities approach is better than that using conventional learning, student learning independence using realistic mathematic educations approache is better than those using conventional learning, and the implementation of learning using the Model approach -Electiting activities in the field are in accordance with the steps that make students more active in learning mathematics.

Keywords
Mathematical Understanding Ability, Learning Independence, Realistic Mathematics Educations

Topic
Mathematics Education

Link: https://ifory.id/abstract/j4FTRDntJXPw

Corresponding Author
Rosa Ariani Sukamto

Institutions
Universitas Pendidikan Indonesia

Abstract
The computer program source code must have a good documentation on it in order to be more understandable by others. One of the documentation is comments. Therefore, the university students need to learn and able to write comments. Some university students are familiar with online judge as a tool for learning programming. Online judge usually does not check how the source code written instead of the output only. This research is aimed for implementing comment analysis module for online judge in order it can check the comments in the source code which is uploaded by students. The comments on this module are categorized as two parts. There are header and process comments. The comments data have taken from online judge which is used before as learning tool for basic programming subject. The data are divided into two groups. There are training group and test group. This module gives mark to the source code comments based on the categorized and similarity score between comments and the given problem.

Keywords
code comment, comment assessment, basic programming subject, online judge, source code

Topic
Computer Science

Link: https://ifory.id/abstract/MxdtCakh98Ku

Corresponding Author
ANNA HENDRI SOLELIZA JONES

Institutions
a) Department of Informatics, Ahmad Dahlan University
a1) diahnuryunita[at]gmail.com
a2*) annahendri[at]tif.uad.ac.id
a3) dewi.soyusiawaty[at]tif.uad.ac.id

Abstract
Farmers are the main actors in agricultural development, have a major contribution in realizing Indonesias agricultural vision. To support the realization of agricultural production and productivity targets, the governments supports is by issuing policies to provide subsidized fertilizer assistance. The criteria for farmers who are eligible to receive subsidized fertilizer assistance are having land less than 1.9 hectares, have been a members of farmer groups, and having work as a farmer or a private employees. Data collection was carried out using the method of observation and interviews with farmer groups in Gunung Kidul. Data classification is done by applying the C4.5 algorithm to 300 data of prospective farmers receiving subsidized fertilizer assistance. Application development includes interface design, making data flow diagrams, implementation and testing. From the research that has been done by applying the C4.5 Algorithm with 300 data and 113 as a training data. Produce a data classification of farmers who are eligible to receive assistance at 88% accurate and targeted to the needs of farmers. This means that the C4.5 algorithm can be used as a classification for determining the eligibility of farmers to receive subsidized fertilizer.

Keywords
Keywords: Algorithm C4.5, Classification, Subsidized fertilizer, Farmers

Topic
Computer Science

Link: https://ifory.id/abstract/WFzLmp3PQudX

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
Handina Djaelani

Institutions
International Program on Science Education, Indonesia University of Education
Jalan Dr. Setiabudi No.229, Isola, Sukasari, Bandung, Jawa Barat 40154
*ikmandanugraha[at]upi.edu

Abstract
Environmental awareness is critical to understanding the present condition of the environment and the significance of protecting it. Science education has an important role in assisting environmental awareness for students. However, limited class time and massive class size problems have restricted student participation and attempted thinking. Consequently, the class debate findings tend to end up being superficial, having little effect on the environmental awareness of the students. This study seeks to explore the environmental awareness of students through the Instagram-mediated SAMR model in studying environmental pollution. Three 8th grade classes of a private junior high school in Bandung consisting of 76 students participated in this study. The students were advised to follow an Instagram account by learning the subject, interacting with each other and the teacher, and submitting their vlog projects. An online questionnaire adapted from Hiramatsu consisting of 5 factors of environmental awareness was used to collect information on the environmental awareness of the students. The data were descriptively evaluated to explore students- responses to those factors. The finding of student environmental awareness demonstrates that students care about environmental problems. It is suggested that learning environmental pollution topic using Instagram-mediated SAMR model can facilitate student environmental awareness.

Keywords
Students Environmental Awareness, Environmental Pollution, SAMR Model, Instagram

Topic
Integrated Science Education

Link: https://ifory.id/abstract/NvQc79EXwxJz

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
Dwi Putri Desti Utami

Institutions
a) Physics Study Program, Department of Physics Education, Faculty of Mathematics and Natural Science Education, Indonesia University of Education, Jalan Dr. Setiabudhi, No. 229, Bandung 40154, West Java, Indonesia
*dwiputridu18[at]gmail.com; aaminudin[at]upi.edu; mimin_iryanti[at]yahoo.com

b) Department of Soil Science, Faculty of Agriculture, Tanjungpura University, Jalan Prof. Hadari Nawawi, Pontianak 78124, West Kalimantan, Indonesia

Abstract
Soil takes a big role as a source of excess CO2 gas emissions that can be the cause of global warming, mainly peat soils that contain a lot of organic matter. One of the factors that influence is soil temperature. The research aims to analyze the temperature distribution at the surface of the soil to optimize the detection of CO2 gas sensor for soil by designing an appropriate heating system. The method used is an experimental method. Research using peat soil placed in the chamber, the heater was placed on it, and a number of thermometer-digitals are placed at several points on its surface in the x-axis and y-axis by plotted distance from the heater is 5cm, 10cm, and 15cm. Temperature alterations toward time can be observed by thermometer and stopwatch. The temperature distribution at the surface of soil occurs evenly in the radial direction, and further the distance of soil from the heater, the less its influence toward temperature alteration of soil. At plotted distance of 5cm, the temperature alteration toward time is 0.0019oC/s, at 10cm is 0.0004oC/s, and at 15cm is 0.0001oC/s. Based on it, the optimal distance used in the design of the heating system is 5cm and 10cm, and CO2 gas sensor successfully detected CO2 gas on it. This result can be used as supporting data in designing a heating system for portable CO2 concentration gauge for soil.

Keywords
Temperature distribution; Temperature alteration; Peat soil

Topic
Physics

Link: https://ifory.id/abstract/FgXQrPJybKH4

Corresponding Author
Abd Hakim. S

Institutions
1Department of Physics, Universitas Negeri Medan, Jl. William Iskandar Pasar V, Medan 20211, Indonesia
2Department of Physics, Universitas Sumatera Utara, Jl. Bioteknologi No. 1., Medan 20155, Indonesia
3 Department of Chemistry, Universitas Negeri Medan, Jl. William Iskandar Pasar V, Medan 20211, Indonesia

Abstract
K-175 concrete research has been carried out with two types of volcanic ash addition, namely variations of 0%, 6%, 8%, 10%, 12% (K-175 concrete) and 15%, 20%, 25%, 30% (density analysis XRD). K-175 concrete contributes to residential concrete. The making of K-175 concrete refers to SNI 7394: 2008 with compressive strength criteria of 14.53 Mpa. The method used is Precast concrete with sheet pile type. The making of concrete K-175 with the addition of cube-shaped volcanic ash with 15 cm sides consisting of cement, sand, broken stone, volcanic ash and water. After casting is done, the concrete is soaked in the tub and then removed from the soaking tub after 28 days of age dried for 24 hours. The following is the water absorption test and compressive strength test by selecting 3 samples which have the optimum compressive strength for XRD, SEM and FTIR tests to see the concrete characterization. Analysis of XRD, SEM, and FTIR are in the variation of 0%, 10% and 25% low absorption, compressive strength respectively 21.06 MPa, 21.16 MPa and 19.46 MPa. The pressure strength also fulfills the compressive strength of Portland cement type I which is 20 MPa.

Keywords
Concrete K-175, volcanic ash, absorption, compressive strength, analysis (XRD, SEM, FTIR)

Topic
Physics related sciences

Link: https://ifory.id/abstract/f2qeHnZxKkQ3

Corresponding Author
Muntazhimah Muntazhimah

Institutions
(a) Universitas Muhammdiyah Prof. Dr. Hamka
*muntazhimah[at]uhamka.ac.id

(b) Universitas Pendidikan Indonesia

Abstract
Many study explained that one of the ways to enhance student-s mathematics ability is by giving the students mathematics learning which could encourage them to control the cognitive processes that they have. The alternative is could be metacognitive strategy. By metacognitive strategy, students are guided to be able to realize what they know and what they don-t know in order to resolve the problem. Metacognitive strategy could be apply in collaborative learning settings in wich collaboration is also one of the competencies in 21st century skills. This study aims to explain the applying of metacognitive strategy in collaborative learning setting at mathematics class by preliminary study and literature study which summarizing and analyzing the result of various study that has been done. Using metacognitive in collaborative learning will increase mathematics ability because it foster confidence and awareness of mathematics concepts and principles learned and control the thought processes carried out .The impact is the metacognitive strategies could be applied in collaborative learning settings in order to enhance student-s mathematics ability

Keywords
metacognitive strategy, collaborative Learning

Topic
Mathematics Education

Link: https://ifory.id/abstract/CWRyfZtX64wn

Corresponding Author
khusnul khotimah

Institutions
Center for Nuclear Standardization and Quality, National Nuclear Energy Agency, Indonesia

Abstract
Land needs for energy infrastructure needs, such as the construction of the planned NPP in Jepara, Central Java, often lead to conflicts with the communities because they consider the existence of this infrastructure will Cause environmental damage. One of the solutions studied to improve the development and move the nuclear power plant is to move the location of the nuclear power plant from land to offshore. Besides, Indonesia has a potentially special offshore site on the eastern Sumatra coastline, northern Java coastline, and the Kalimantan coastline. The purpose of this paper is to review the environmental aspects of the implementation of GBS Nuclear power plant in Indonesia. The method used is the review of the literature and subsequently conducted a descriptive analysis. The results showed that SMART offshore NUCLEAR power plants should be considered because it offers clean energy sources, improved safety aspects, availability of offshore sites, and better community of acceptance.

Keywords
environmental assessment, smart offshore NPP, technology

Topic
Energy and environment materials

Link: https://ifory.id/abstract/vQbJnEDKW7mX

Corresponding Author
Judhistira Aria Utama

Institutions
a) Department of Physics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia
*j.aria.utama[at]upi.edu
b) Department of Computer Science Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia

Abstract
Orbital computation of 3,372 real near-Earth asteroids (NEAs) population was conducted and their orbital evolution was recorded every 1,000 years for the next 5 Megayears (Myr). This study is aimed to detect asteroids in 1:1 mean-motion resonance (MMR) with planets. In order to achieve our goal, we employed N-body numerical simulation with the use of Swift-RMVS (Regularized Mixed-Variable Symplectic) integrator. We found that NEAs population could have evolved into asteroids in a co-orbital state with Terrestrial planets (Mercury to Mars). For the detection of this co-orbital condition a time series of motif discovery algorithm known in computer science was applied to asteroids orbital elements. The predicted results of the experiments carried out were then compared with one of the standard tool in astronomy, which showed that our model could prove the location of the motif and the duration of the asteroid in co-orbital state with each Terrestrial planets.

Keywords
Co-orbital state; Motif discovery; Near-earth asteroids; Orbital elements; Time series

Topic
Physics

Link: https://ifory.id/abstract/crY8VdbXGZRt

Corresponding Author
khusnul khotimah

Institutions
BATAN
Universitas Pertahanan

Abstract
Indonesia is still far from having an ideal future energy security, which is indicated by energy inefficiency. In fact, the dependency on fossil energy became a barrier to optimize the energy sector. Therefore, to achieve energy security, Indonesia should manage its energy resources strategically. As a solution, it can be solved by utilizing plastic waste as a source of alternative fuel (pyrognate) through pyrolysis treatment. The approach of this research used mix method analysis to measure the utilization of the plastic waste into fuel oil pyrolysis with the design of a cracking reactor prototype using induction heating technology. The LDPE which has been used in this paper is 0.5 kg, also the stainless steel cylindrical reactor. Furthermore, the R&D efficiency results showed that the up and down pattern used in its score. It shows in the increasing of R&D efficiency start from 2009 with 0.891 and ended in escalated point with 1.00 efficiency score in 2016. The result showed that it has high energy efficiency due to fast start-up in the process causing low equipment cost (affordability), precision, and repeatability. With the right resolve, Indonesia will emerge to be stronger and more defensible in the realm of energy

Keywords
DEA, Energy Security, Fuel, Induction Heating, Plastic Waste

Topic
Energy and environment materials

Link: https://ifory.id/abstract/Q4bpydh8cZMK

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
Afrida Hafizhatul Ulum

Institutions
a) Instrumentation and Computational Physics, Department of Physics, Institut Teknologi Bandung, Indonesia
*afridahafizhatul[at]gmail.com
b) National Electronics and Computer Technology Center, National Science and Technology Development Agency, Pathum Thani 12120, Thailand

Abstract
Here, we report an efficient approach to optimize the performance of surface enhanced Raman scattering (SERS) substrate. The geometry of the SERS substrate consists of the Au film deposited on polymer grating. Firstly, an optimized value of grating geometries and Au thickness has been performed by rigorous-coupled wave analysis (RCWA).The SERS substrate were fabricated by the laser interference lithography (LIL) and magnetron sputtering of Au thin films. The effect of the Au thin film prepared by magnetron sputtering at different deposition time (5-180 s) and operated pressure (3-5 mTorr) on the SERS performance were investigated and compared with the RCWA simulation results. The morphology of the obtained samples was observed by field-emission scanning electron microscopy (FE-SEM). The results indicated that optimal SERS substrate with deposition time of 180 s and 3 mTorr-operated pressure was obtained. The limit of detection for methylene blue (MB) and methyl parathinon were evaluated at 10^(-4) M and 10^(-2) M, respectively. Moreover, our SERS substrate shows the application of a portable Raman spectrophotometer which also promising for on-site pesticide substance detection.

Keywords
SERS, Au film, RCWA, laser interference lithography, Pesticide

Topic
Optical, luminescence, Electronic Materials and applications

Link: https://ifory.id/abstract/4Mgq7bkrwDzx

Corresponding Author
Anita Ahmad Kasim

Institutions
1)Departemen of Information Technology, Tadulako University, Palu, Indonesia

2)Department of Architecture, Tadulako University, Palu, Indonesia

3)Department of Computer Science, Mulawarman University, Samarinda, Indonesia

Abstract
The problem in this research is the difficulty in distinguishing batik motifs from non-batik motifs for people who do not understand batik motifs. The classification of batik motifs can be done by processing digital images of batik motifs using artificial neural network methods for the classification of batik image motifs. This study aims to utilize artificial neural networks to distinguish batik motifs and non-batik fabric motifs. Several important steps are needed, namely the process of acquiring batik and non-batik images, pre-transforming batik and non-batik images to gray scale forms, texture feature extraction in gray scale images and detection of motifs using networks artificial nerve. Image acquisition is done by collecting batik and not batik images from several different motifs. The preprocessing process is done by changing the image size to 256 x 256. Sixteen texture features are used, namely Angular Second Moment (ASM), contrast, correlation and Inverse Different Moment (IDM) with 45 ° angle intervals, namely 0 °, 45 °, 90 ° and 135 °. Processing data sets is divided into 70 percent as training data and 30 percent as testing data. Artificial neural network models used in this research use the Backpropagation learning algorithm by comparing the Scaled conjugate gradient algorithm (trainscg) training method and the Levenberg-Marquardt algorithm (trainlm) training method. The results obtained for the accuracy of the batik detection model using the Scaled conjugate gradient algorithm (trainscg) training method were higher with an accuracy value of 86.7%, compared to the Levenberg-Marquardt algorithm (trainlm) method by 73.5%.

Keywords
batik,textura features,ANN

Topic
Computer Science

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

Corresponding Author
Afrida Hafizhatul Ulum

Institutions
a) Instrumentation and Computational Physics, Department of Physics, Institut Teknologi Bandung, Indonesia
*afridahafizhatululum[at]gmail.com
b) National Electronics and Computer Technology Center, National Science and Technology Development Agency, Pathum Thani 12120, Thailand

Abstract
Surface enhanced Raman scattering substrate was an alternative analytical tool with ultrahigh sensitivity and rapid response for chemistry, medicine and forensics science. In this work, the surface enhanced Raman scattering (SERS) substrate based on PDMS grating structure created by laser interference lithography using excimer laser modification and further 80 nm-thick Au thin film deposition by dc magnetron sputtering was proposed. We investigated the effect of the grating depth on SERS performance. The methylene blue solution of different concentration was employed to test the SERS performance using the portable Raman spectrometer. The optimal SERS performance can be optimized by fabricating the PDMS grating structure with 850 nm-period, 310 nm-depth and 0.5-filling factor

Keywords
SERS, laser interference lithography, magnetron sputtering, PDMS grating

Topic
Optical, luminescence, Electronic Materials and applications

Link: https://ifory.id/abstract/6aUDCfP2cQGR

Corresponding Author
Sry Rita Puspitasari

Institutions
a) Sekolah Pascasarjana Universitas Pendidikan Indonesia
Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia
*sryrita27[at]upi.edu
b) Departemen Pendidikan Matematika Universitas Pendidikan Indonesia2
Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia

Abstract
This study aims to obtained a picture of students mathematical creative thinking abilities on triangles and quadrilateral material, which involves 4 indicators namely fluency, flexibility, originality and elaboration. The method in this study was a qualitative descriptive study, which was conducted on 31 students at one junior high school in Cipatat sub-District. Data in this study were obtained through tests and interviews. The results of this study indicate that there is a tendency that flexibility indicators can be mastered well by students and based on an average score of 2.37 that is in TKBK 2. The conclusion of this study is the mathematical creative thinking ability of students in one junior high school in Cipatat sub-District is quite creative.

Keywords
Creative Thinking; Triangles and Quadrilateral

Topic
Mathematics Education

Link: https://ifory.id/abstract/vwe8xZg9nmcb

Corresponding Author
NARONG SANGWANATEE

Institutions
1Electronics Technology, Faculty of Science, Ramkhamhaeng University, Huamark Bangkapi Bangkok Thailand. 10240
2Department of Electronics, Faculty of Engineering, King Mongkut-s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
3Applied Physics Research Group, Faculty of Science and Technology, Suan Sunandha Rajabhat University, Bangkok 10300, Thailand

Abstract
In this paper will present the properties of PN diode before and after expose by radiation. Although, radiation help to improve the performance of semiconductor device but still has some damage in device structure. In previous article I have showed performance improve after expose by soft radiation. The device is exposed by X-ray radiation with few second for several times. In principle of PN diode after fabrication will has defects from process such as ion implantation, doping and silicon wafer process. The results show temperature while X-ray expose on device that generate high temperature on surface and silicon boundary that may the optimize energy and expose time for treatment damage of PN diode.

Keywords
X-ray ; PN Diode

Topic
Optical, luminescence, Electronic Materials and applications

Link: https://ifory.id/abstract/FUzn9BE67hex

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
NARONG SANGWANATEE

Institutions
1Applied Physics Research Group, Faculty of Science and Technology, Suan Sunandha Rajabhat University, Bangkok 10300, Thailand
2Department of Electronics, Faculty of Engineering, King Mongkut-s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
3Electronics Technology, Faculty of Science, Ramkhamhaeng University, Huamark Bangkapi Bangkok Thailand. 10240

Abstract
In this study present the effect of Flash radiation to forward bias current-voltage (I-V) of PN diode by using Comsol simulation program. The results show surface thermal and electric change while expose by radiation with flash exposure technique. Series resistance (Rs) increase around 2 times and close to idea case after expose by radiation, the radiation will impact to bulk defect and reduce surface recombination. Radiation induce temperature on surface and deep into silicon bulk. The value of Rs increase with increase expose time. The changing of Rs becomes independent from radiation dose at high forward bias voltage.

Keywords
PN Diode ;Soft Radiation

Topic
Optical, luminescence, Electronic Materials and applications

Link: https://ifory.id/abstract/awjXz8qUCPMT

Corresponding Author
Eddy Prasetyo Nugroho

Institutions
Departement of Computer Science Education
Universitas Pendidikan Indonesia

Abstract
This research aims to design and build interactive multimedia game based on TANDUR strategy to improve SMK sudents- concept understanding in Basic Programming subject. Quantum teaching learning model TANDUR strategy means Tumbuhkan (Grow), Alami (Experience), Namai (Name), Demonstrasi (Demonstration), Ulangi (Repeat), and Rayakan (Celebrate). Researc data gathered from field survey quastionnaire and interviewing RPL subject teacher in one SMK in Bandung. Reserch results are: 1) interactive multimedia game has been developed and rated good so that it is worth applying with percentage of 80% from media expert and 83% from content expert and 76% from students- assessment. 2) interactive multimedia game improves students- concept understanding by gain index, before using interactive multimedia game average score for over achiever or upper group was 60 after using interctive multimedia game 86.3, average or middle group from 36 to 72.9, and under avhiever or lower group from 35.4 to 61.

Keywords
Multimedia, Game, Quantum Teaching Learning Model, TANDUR Strategy, Concept Understanding

Topic
Computer Science Education

Link: https://ifory.id/abstract/fxDXj3mPyeLr

Corresponding Author
Diah Kusumawaty

Institutions
Prodi Biologi Departemen Pendidikan Biologi FPMIPA Universitas Pendidikan Indonesia, Jalan Dr. Setiabudi no 229 Bandung 40154 Indonesia
*diah.kusumawaty[at]upi.edu

Abstract
Housekeeping gene are effective genes needed in cell maintenance and often used as internal controls in gene expression normalization because of their stable nature. However, information from the housekeeping gene especially on Anguilla bicolor is unknown. In relation that, this study aims to isolate and sequencing housekeeping of Anguilla bicolor by designing degenerate primer. 18s ribosomal proteins (18S rRNA), Beta Actin (ACTB), Elongation Factor 1-Alpha (ef1a) and Glyceraldehyde-3-Phosphate Dehydrogenase (GAPDH). The degenerate primer consists of two primer sets (outer and inner) were designed by: (1) Collection fish sequences of Actinopterygii class; (2) Aligment sequences; (3) Uploading sequences to the Primaclade web; (4) Selection of primary pairs. The selected primers were then used to amplify housekeeping gene Anguilla bicolor using the Nested PCR method. DNA of Anguilla bicolor was obtained from DNA isolation using the Sambrook protocol. The result of housekeeping gene amplification was then sequenced directly to determine the nucleotide sequences of the gene sequences. Next, contig and BLAST analysis are performed on the gene sequences obtained to ensure that the sequences match the target genes. The results of BLAST analysis showed that the three of four genes sequences were corresponding to the target gene, those are ribosome protein 18s (18S rRNA), Beta Actin (ACTB) and Elongation Factor 1-Alpha (ef1a). The general grouping of dendrograms showed that the three gene sequences were in groups with gene target. The conclusion of this study is the discovery of three specific sequences which can be used as a source for designing specific primers in subsequent studies.

Keywords
Anguilla bicolor, Housekeeping gene, Degenerate Primer, Nested PCR, Specific Primer.

Topic
Biology

Link: https://ifory.id/abstract/uVLN24PgyrM7

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
NENI HERMITA

Institutions
Program Studi PGSD, Universitas Riau, Pekanbaru 28293, Indonesia

Abstract
The aim of the study was to identify levels and model of understansding of prospective primary school teachers related to concepts of heat convection. This study uses the descriptive quantitative method. Research subject were 30 prospective primary school teachers at one university in Riau Province who had attended the basic concepts of science course with their lecturers. The instrument used to collect data is a conceptual understanding test consisting of four parts of the questions. The results showed that profile of levels of understanding of primary school teachers retated to concept of heat convection are: Sound Understanding (SU) (0 %), Partial Understanding (PU) (47%), Incorrect Understanding (IU) (20%), No Understanding (NU) (20%), No response (NR) (13%), and profile of model of understanding are: Optimum Model (OM) (0%), Uncreative Model (UM) (10%), Theoretical Model (TM) (20%), Practical Model (PM) (17%), Memorizing Model (MM) (20%), Inappropriate Model (IM) (33%). These results indicated that lectures on basic concept of science carried out by the lecturers had not facilitated the achievement of the sound understanding level and the optimum understanding model for prospective primary school teachers.

Keywords
Prospective primary school teacher, levels of understanding, model of understanding, Heat Convection.

Topic
Integrated Science Education

Link: https://ifory.id/abstract/9ugcjp82Ck3n

Corresponding Author
Andi Suhandi

Institutions
Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia

Abstract
The aim of this study was to find out the effect of using computer assissted-conceptual development conceptual change text (CA-CDCCText) in improving high school students- mental model related to the concept of battery function in the DC circuits. CA-CDCCText consists of six part of the text. The method used in this study is a pre-experiment with one group pretest-posttest design. The number of research subjects was 36 students consisting of 20 female and 16 male students, at one high schools in West Java province. Data were collected by level of conceptual understanding test related to the concept of battery function in the DC circuits. The results showed that the use of CA-CDCCText in physics learning could be improved the mental model of 78% of high school students towards a scientific mental models. These results indicate that the use of CA-CDCCText has a high effectiveness in improving high school students mental model related to the concept of battery function in the DC circuits.

Keywords
High school students, CA-CDCCText, Mental Model, Battery Function

Topic
Physics Education

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