Indonesia Conference Directory

Corresponding Author
Sri Rahayu

Institutions
Pendidikan Guru Sekolah Dasar, Universitas Kanjuruhan Malang

Abstract
School effectiveness is not only seen from the aspect of completeness facility and infrastructure, but more determined by educational management, including the teachers and students expectation to achieve the great learning outcome through the learning process. The purpose of this research is to find the significant relationship directly and indirectly between variables of teacher concern for innovation, emotional intelligence, school culture on school effectiveness. Sample of this research were 333 teachers of State Elementary School in Malang City. Collecting data used questionnaire with Likert scale. Data analysis used Structural Equation Models (SEM) with AMOS 18.0 Software. The analysis results show that school culture could mediate the influence of teachers care of innovation and emotional intelligence on school effectiveness. The stronger contribution of school cultur indicator configurate teachers concern for innovation and emotional intelligence on school effectiveness are organizational structure and focus on students with indicated by loading factor value of 7,91. This condition shows that the teacher must be able to foster awareness of the demands of innovation and adapt with environment, so can create the intimate situation in the class. Thereby, the positive school culture will be created and it can improve the school effectiveness.

Keywords
innovation, emotional intelligence, school culture, and school effectiveness

Topic
Other Areas of Education

Link: https://ifory.id/abstract/JTxqBkQZEA8h

Corresponding Author
Nora Santi

Institutions
a) Magister of Chemistry Education Study Program, postgraduate School, State University of Medan, Medan North Sumatra, Indonesia, Corresponding email: Nora Santi.ns[at]gmail.com
b) Department of Educational Chemistry, State University of Medan, Medan 20221, indonesia

Abstract
ABSTRAK This study aimed to understand level of feasibility of learning media mobile learning for special topic of chemical equilibrium; and to know the differences of the improvement learning outcomes of students is problem based learning in learning chemical equilibrium studied by using media of Mobile Learning developed with power -point. It used R & D method (Development Research) with model ADDIE. Sample selection using purposive sampling technique. The population in this study were college student S-1 of semester II of chemistry education study program taking elementary chemistry courses even semester 2018/2019 at State University of Medan. The sample in this research are two classes in the basic course chemistry of FMIPA UNIMED department semester 2 which have 25 students for each class. The research instruments are motivation questionnaire and objective test. Data were analyzed using descriptive method and statistical analysis with independent sample t-test. The result showed that: (1) the developed learning media of Mobile Learning was categorized with feasible to used but still needs to be revised and developed, (2) there was the difference improvement learning outcomes of students (N-gain of students) for special topic of chemical equilibrium that learned using media of Mobile Learning which had been developed in experimental class I was found higher than that in experimental class IIwith power-point media (74% > 63%).

Keywords
Mobile Learning, Problem Based Learning (PBL), Chemical Equilibrium, students Achievement

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/6FCvQxuKg3aJ

Corresponding Author
Didit Ardianto

Institutions
1) Department of Science Education, School of Postgraduate, Pakuan University
2) Department of Science Education, School of Postgraduate, Universitas Pendidikan Indonesia

Abstract
Earth science education is the right way to train STEM literacy. These multi literacy are needed by students in understanding the nature of complex earth systems. However, there is no standard test which used to measure STEM literacy in earth science education currently. The aim of this study was to develop a standardized to measure prospective elementary teachers- STEM literacy and to initially evaluate its psychometric properties. We constructed 7 multiple-choice items and 5 essay items regarding earthquake issue. We using 90 students- conceptions to evaluate item tests. In an item response theory-based validation study (N = 2,247), we applied multiple regression analyses to test hypotheses based on groups with known attributes. The RASCH Model was used to validate the instrument on the aspects of validity, reliability, and the level of difficulty. The results indicate that prospective teachers- STEM literacy in earthquake issue is still low, especially in identifying problem and designing model relates STEM criterion.

Keywords
Assessment, STEM literacy, Earth Science

Topic
Learning / Teaching Methodologies and Assessment

Link: https://ifory.id/abstract/XwTyCt7hB4mU

Corresponding Author
Wuri Dwiyati

Institutions
UNIVERSITAS NEGERI MEDAN

Abstract
WURI DWIYATI, 8176121007, Development of Learning E-Module for body care Based on Discovery Learning in Makeup Student Education Studies Program, State University of Medan. This study aims to: (1) study the feasibility of e-module body care learning based on learning discovery, and (2) learn the effectiveness of e-module body learning based on learning discovery. This type of research is development research using Borg and Gall products combined with the Dick and Carey learning development model. This model contains six stages, namely: literature study, planning and design development, product development, expert validation, trials, revisions, and final products. The trial subjects consisted of two material experts, two learning design experts, two video learning media experts, three students for individual testing, nine students for small group trials, and forty students for field trials. The results of the study show; (1) expert study material test based on excellent qualifications (93.75%), (2) learning design expert test in accordance with good qualifications (80.08%), (3) test video learning media experts in accordance with very good qualifications ( 89, 99%). The results of the hypothesis submission prove that: (1) the e-module learning media is appropriate to be used in the learning of nursing bodies in educational study programs in Medan state universities, (2)Students who are taught by using body care learning e-modules with student learning outcomes are learned by using textbook learning media. This discusses the results of data processing t count = 3.285 at the significance level &

Keywords
pengembangan e-modul pembelajaran; perawatan badan berbasis discovery learning

Topic
Vocational Education and Educational Technology

Link: https://ifory.id/abstract/tg7CxBNEVXvM

Corresponding Author
Herdiyana Herdiyana

Institutions
Program Studi Ilmu Manajemen, Program Pascasarjana- Universitas Pakuan, Jalan Pakuan No 1, Bogor

Abstract
This study aims to analyze the problem solving skills of economic students in "linear programming" course. A Thirty students were involved in this descriptive study. Data collected by observation and analysis of student answers to each case given. This learning used a case about “linear programming” as a stimulus to explore student problem solving skills. The study showed that students use graph, simplex, transportation, and assignment methods to solve problems about “linear programming”. In addition, this study also showed that students are only able to use mathematical formulas in solving questions about “linear programming”. However, students are not able to represent "cases of linear programming" in the form of mathematical language. It showed that students have not been able to apply the concepts to solve “linear programming” problems that exist in everyday life. Therefore, learning about "linear programming" should be emphasize giving authentic cases about “linear programming” because it expected to be able to train students problem solving skills.

Keywords
Linear Programming, Problem Solving Skills

Topic
Course Management

Link: https://ifory.id/abstract/j4cwP73dGpnu

Corresponding Author
ASCO HASIHOLAN SIMARMATA

Institutions
Educational Technology Study Program, Postgraduate Program, Medan State University
Jalan Willem Iskandar Pasar V, Medan Estate, Sumatera Utara

Abstract
The problem in this study is the low student learning outcomes of basic swimming pool style technique topic. This research aims to find out: (1) the learning outcomes of basic breaststroke swimming techniques taught with inclusion teaching styles higher than reciprocal teaching styles (2) the results of learning basic techniques of high motivation breaststroke swimming taught in reciprocal teaching higher than high motivation taught by the style of teaching inclusion (3) there are interactions between teaching styles and student motivation. This research was conducted on students of Medan 6 Public Middle School class VII Even Semester Academic Year 2018-2019. The sampling technique was used with Purposive Sampling based on each consisting of 32 for the first experimental class and 32 for the second experimental group. The research method used was quasi-experimental with factorial 2 x 2. The analysis technique used was a two-way analysis of variance with a significance level of &

Keywords
Teaching Style, Learning Motivation, Learning Outcomes, Breaststroke Swimming Technique

Topic
Teachers Education Model in Future

Link: https://ifory.id/abstract/a8xbMYLy6q34

Corresponding Author
Galuh Yuliani

Institutions
Chemistry Department, Universitas Pendidikan Indonesia

Abstract
In chemistry, laboratory works are ideal media for students to understand the connection between the unseen microscopic world and the observable macroscopic world. Laboratory experiences provide opportunities for team building, inquiry-based learning, hands-on activities, and exposure to standard laboratory equipment and technology. Many of the concepts and principles common in high school chemistry courses can actually be demonstrated or discovered through experiments performed with simple apparatus. Currently, investigations on the Indonesian teachers- performance in designing practical chemistry laboratory are still very rare. The investigation is crucial to understand the problems and challenges faced by Chemistry teachers in preparing laboratory works and to improve their performance based on the research findings. This study investigated the teachers- current practice of laboratory activities in various high schools in West Java, Indonesia. This research is a survey research with a qualitative approach. The research subjects were 27 senior high school. The instrument used in this study was a non-test in the form of a Likert scale questionnaire. The questionnaires consisted of 9 items covering the pre-laboratory activity, during laboratory activity and post-laboratory activity. It was found that the number of experiments conducted, teachers- preparation and the reflection session after laboratory works were considered sufficient. However, the teachers- awareness on the safety instruction and green chemistry approach were still low. Additionally, laboratory works that focuses on the problem-based and discovery are not popular among teachers. It is suggested that the later practical work method is introduced to teachers because this approach allows students to practice higher level analytical skills, problem solving, connection to theory and transferable skills.

Keywords
practical work; laboratory; chemistry; teachers- performance

Topic
Learning / Teaching Methodologies and Assessment

Link: https://ifory.id/abstract/qEtb7duLJXBe

Corresponding Author
Predi Setiadi Peranginangin

Institutions
1, Chemical Education Study Program, Postgraduate, Medan State University, Medan
2 Department of Chemistry, Faculty of Mathematics and Natural Sciences, Medan State University, Medan

* Correspondence : predi.setiadi[at]gmail.com

Abstract
The purpose of this research was to observe the influence of practical guide based on the inquiry approach toward student achievement on the subject of pH scale and the use of indicators. The research was carried out in the chemistry education study program, Medan State University. Before the hypothesis measure test, the normality and homogeneity test was performed first, signed both of distributed samples has normal and homogeneous. The results of the research shown that there was the influence of practical guide based on the inquiry approach toward student achievement on the subject of the pH scale and the use of indicators, the average of the learning result and percentage gain which taught by practical guide based on inquiry approach are 78.74 and 66.9 respectively while the results of learning chemistry and percentage gain taught with conventional practical guide are 73.03 and 59.4, with difference of percentage gain equal to 7.4. The hypothesis in this study was tested by using the right-t-test and hypothesis testing results obtained t count higher than t table with the value, 3.167 is higher than 1.669 with alpha is 0.05.

Keywords
Inquiry Approach, Practical Guide, Student Achievement

Topic
Mathematics,Science and Nursing Education

Link: https://ifory.id/abstract/Az89Bu4vXD72

Corresponding Author
Heli Siti Halimatul Munawaroh

Institutions
Department of Chemistry Education,
Faculty of Mathematics and Science Education
Universitas Pendidikan Indonesia

Abstract
The important challenge in science education is improving students- scientific literacy, including argumentation skill. Argumentation skill was crucial to address the problem related to scientific issues that occurs in every aspect of lives. The Science Writing Heuristic (SWH) approach has been used succesfully created an environment that forces students to construct their knowledge through argumentation process. The purpose of this current study was to implement the SWH approach to develop chemistry students- argumentation skill in general chemistry laboratory class. The students in the experiment class were required to construct argument using writing as tool for scientific investigation process. In contrast, students in the control groups learned science in traditional scientific approach setting. The results show that students who recevided traditiona scientific approach laboratory instruction approach scored lower on various aspect of argumentation aspects, suggesting the SWH-based laboratory instruction is valuable in promoting students- argumentation skill.

Keywords
Inquiry strategy, Student-centered, Science Writing Heuristic, Argumentation skill

Topic
Learning / Teaching Methodologies and Assessment

Link: https://ifory.id/abstract/Axq6VujQC3Xa

Corresponding Author
Putra Arima

Institutions
UNIMED

Abstract
This study aims to determine the values of achievement that exist in the traditional Gayo horse racing sport. Because during this time the horse race was only considered as peoples entertainment, which was initially held at the edge of the laut tawar lake of Takengon to enliven the success of the rice harvest. This research is a descriptive qualitative research conducted in Bener Meriah, Aceh. The samples in this study were the tourism department of Bener Meriah, Horse Owner, and Horse Race Jockey amount of 12 people. The method of data collection is done by observation, interviews, and documentation. Then the data obtained were analyzed by qualitative analysis with non statistical descriptive analysis. The results of the research show that the achievement values contained in the horse racing competition are carried out traditionally. Like a jockey must has a strong mentality and must also has high motivation to help support jockeys achievements to the best result. The main goal is not only the victory gained at the racetrack, but the important thing is to strive to achieve victory well. The struggle to achieve victory in a healthy way, does not justify everything for a victory to achieve goals achievement. To achieve an achievement must apply sports values such as sportsmanship, honesty, and responsibility in carrying out the training process provided.

Keywords
Traditional Horse Racing, Achievement Value, Bener Meriah

Topic
Social,Language and Cultural Education

Link: https://ifory.id/abstract/vfJA6mQR9Zdn

Corresponding Author
Nihta Vera Frelly Liando

Institutions
Universitas Negeri Manado
Universitas Kanjuruhan Malang

Abstract
The purpose of this study was to find out and explain the influence of e-learning model and interest to learn towards student learning ability. The research method used a survey method. The population in this study was 125 students of grade 10th, Aquino Amurang Catholic High School, with a total sample of 102 respondents (Isaac and Michaels table) through purposive sampling with data collection techniques through questionnaires with a Likert scale. The analysis used in this study was multiple regression analysis. The results lead to the following conclusions, first, student learning abilities can be formed by e-learning model and student learning interest; second, the influence of e-learning model and student learning interest provides a positive and significant influence on student learning abilities; third, both e-learning model and student learning interest have a positive and significant effect on students learning abilities.

Keywords
E-Learning Based Learning, Interest Learning, Student Learning Ability

Topic
Learning / Teaching Methodologies and Assessment

Link: https://ifory.id/abstract/G462nTemPrxR

Corresponding Author
Farid Dwi Murdianto

Institutions
Politeknik Negeri Madura

Abstract
Partical Swarm Optimization (PSO) is one algorithm that aims to get a minimum or maximum function. This algorithm is based on the behavior of a flock of birds where between individuals influence each other in one group. In this study PSO will be implemented to overcome the problem of power flow at the plant. In this PSO algorithm, the search for solutions is carried out by a population consisting of several particles. The population is randomly generated with the smallest and largest value limitation. This population represents a generator in an electric power distribution system. The plant used in this study was IEEE 30 bus. In IEEE 30 bus there are 6 plants that must be optimized. The IEEE PSO implementation is able to produce 227 MW of power or around 70 MW lower (cheaper) than Newton Raphsons and Fast Decoupled power flow optimization method.

Keywords
Particle Swarm Optimization, Power Flow, IEEE 30 Bus

Topic
Renewable Energy

Link: https://ifory.id/abstract/CUk9XNWRm6PM

Corresponding Author
Fauziatul Fajaroh

Institutions
Universitas Negeri Malang

Abstract
Until now, used cooking oil (jelantah) has not been utilized optimally. This study seeks to convert this waste into biodiesel. Used cooking oil usually contains high concentration of free fatty acids which can be converted into methyl esters through transesterification by methanol. This effort is in line with the increasing need for renewable energy sources. Because of the waste still contains high concentrations of free fatty acids, then it is necessary to think about the proper process and utilization of superior catalysts for transesterification. One of the allegedly superior catalysts is ferrit-based nanocomposite catalyst, namely CaO@CoFe2O4. This hypothesis is based on the properties of ferrite which are thermally and chemically stable and can be drawn by magnetic fields. The particles on the nanometre scale are thought to show high reactivity as a catalyst. The composite with strong base oxide CaO which is not soluble in methanol is also a supporting factor.The purpose of this study was to synthesize and to characterize CaO@CoFe2O4, then to study its potential as a catalyst in biodiesel production from used cooking oil in various weight percent of catalyst. The main steps include: (1) synthesis of CoFe2O4by coprecipitation; (2) Impregnation of CaO into CoFe2O4 and converted to CaO@CoFe2O4; (3) Characterization of the synthesized material was carried out by XRD, BET, and SEM/EDX; (4) application of CaO@CoFe2O4 to biodiesel production from used cooking oil; (5) characterization of biodiesel produced. Based on the results of XRD and SEM/EDX analysis, the CaO@CoFe2O4 catalyst has been successfully synthesized. At optimum condition, the addition of 4% catalyst in trans-esterification reaction of used cooking oil produced 95.27% of methyl esters. This means, CaO@CoFe2O4 is a catalyst that can be seeded in biodiesel production.

Keywords
Renewable energy, biodiesel, CaO@CoFe2O4, catalyst

Topic
Biomass, Biofuel

Link: https://ifory.id/abstract/k3R9zqUWbgcK

Corresponding Author
Thathit Suprayogi

Institutions
1)Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
2)Centre of Advanced Material for Renewable Energy (CAMRY), Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia
3)Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
4)School of Physics, Suranaree University of Technology, Thailand

Corresponding author: markus.diantoro.fmipa[at]um.ac.id

Abstract
Abstract. Photosupercapacitor is an integrated device for harvesting and storing of solar energy into electrical energy. Photosupercapacitor is constructed by solar cell (DSSC) and supercapacitor. In the solar cell part, one of the influential variables is the photoanode performance. The photoanode with ZnO layer play a role in light absorption, charge mobility, and wide band gap, which are influenced by crystal structure and nanoscale morphology. One of nanoscale morphology of ZnO is nanorods. This work is planned to investigate the effect of annealing temperature of seed layer ZnO to growth nanorods shape in photoanode of photosupercapacitor on its performance. The seed layer ZnO nanoparticle was deposited onto FTO substrate by a screen printing method. The ZnO nanorods was grown by soak FTO/ZnO in solution (Zinc nitrate, HMT, and DI water) under 100 C. The photosupercapacitor is constructed by DSSC and ZnO symmetric supercapacitor which integrated by using aluminum foil substrate. Characterization was done using XRD, SEM, UV-Vis, and I-V solar simulator for photosupercapacitor performance.

Keywords
Photosupercapacitor, annealing temperature, ZnO seed layer, nanorods

Topic
Energy Storage

Link: https://ifory.id/abstract/jDY3tuc7HmrU

Corresponding Author
Yeny Rachmawati

Institutions
Sebelas Maret University

Abstract
This study will conduct a study on the attitudes of hotel tourist to renewable energy especially solar PV for hotel accommodation in Surakarta, Indonesia. This research has been carried out in many countries in the world in involving community participation to consider new policies. This research is important to do to obtain valid information by directly involving community participation. This is good for government and hotels use in taking new policies on energy. This study uses a survey method with questionnaire research instrument and emphasizes the problem of responses (feedback) to obtain a broad explanation through the attitudes of hotel tourist to the application of renewable energy in Surakarta. This study uses a quantitative approach with descriptive statistical data analysis and simple random sampling by formula of Slovin to determine the number of samples from the population with an error rate of 5%. This research looks for 336 samples in star hotels from 1 to 5 stars in Surakarta hotels. Visitor attitudes in reducing energy consumption were 74%, visitor attitudes in recognizing RES failures were 40%, visitor attitudes in paying extra for RES installation were 35%, visitors perception of solar PV installation on the roof at 55%, and visitors perceptions of solar PV installation on balconies were 78%.

Keywords
Renewable energy; Solar PV; Tourist hotel accommodation.

Topic
Renewable Energy

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

Corresponding Author
Mahfud Mahfud

Institutions
Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
* mahfud[at]chem-eng.its.ac.id

Abstract
Microalgae is one of the potential raw materials in the manufacture of third generation biodiesel because of high lipids contents and not require large space for cultivation. In this study, Chlorella sp. chosen because of its high oil content of around 30% of the weight of dry algae. In this process the use of microwave irradiation can accelerate the in situ transesterification reaction by extracting microalgae lipids and simultaneously being converted to Methyl-Esters. The aims of this research is to study biodiesel (methyl ester) making through the Insitu trans-esterification process by studying the effect of acid catalyst concentration, microwave power and reaction time. The experiment was carried out in a 1000 ml flat bottom flask made of pyrex, with the influence of microwave irradiation and using a homogeneous sulfuric acid catalyst (H2SO4). Operating conditions at atmospheric pressure with operatings variables: catalyst concentration, microwave power and reaction time. To minimize the number of runs, the experiment was designed with response surface methodology using Box Behnken Design (3 factors and 2 levels). Oil and metyl ester extraction products were analyzed by GC-MS analysis. The results of the experiment showed that the yield of methyl esters increased with the length of extraction time, and was significantly affected by microwave power and catalyst concentration.

Keywords
Biodiesel, Metyl Ester, microalgae, Chlorella sp., Microwave, in situ transesterification.

Topic
Chemical Engineering

Link: https://ifory.id/abstract/w7bqEcYTHgD2

Corresponding Author
Prayitno Prayitno

Institutions
State Polytechnic of Malang

Abstract
In the seaweed processing industry to obtain quality products that are free of microorganisms, high concentrations of chlorine are used in the immersion process. Thus the wastewater from the immersion process still contains high concentrations of chlorine, where the wastewater when disposed of into the aquatic environment can cause pollution and environmental damage. The aim of the research is the reduction of high levels of chlorine in seaweed wastewater using a combination process of aeration, heating and addition of HCl. The experiment was carried out by adding wastewater from the seaweed immersion process with HCl (1, 2, 3, and 4% v/v), aerated at flowrate (1, 1.5, 2, and 2.5 liters/minute) and heated at temperature (35, 40, 45, and 50oC). The experimental results showed that the maximum reduction of chlorine by 99.4% was obtained by adding HCl by 4%, flowrate of 2.5 liters/minute and heating temperature of 50oC.

Keywords
Aeration, Chlorine, Immersion, Seaweed, Wastewater

Topic
Environmental Science and Engineering

Link: https://ifory.id/abstract/73Nv69xGUZDj

Corresponding Author
anwar aini

Institutions
Institut Teknologi Sepuluh Nopember, Indonesia

Abstract
Using IS (Information System)/IT (Information technology) has become the organizations need to carry out its operational activities and services. The government has also used IS/IT in carrying out its activities and services considering the benefits that are get, efficient, effective, and transparency to support good and clean governance. Gresik Regency does not yet have a master plan for implementing IS/IT so that what it needs cannot be managed. Gresik Regency needs a planned information technology-based system that can produce correct and prompt information. purpose of this study was to identify data and information needs in policy formulation and to develop an information system strategic plan in Gresik Regency. basic concept used in compiling this research is the method proposed by John Ward and Joe Peppard. stages carried out start from analyzing the internal and external business environment of the organization, analyzing internal and external organization IS/IT, followed by identifying strategies and designing future portfolios. Method of analysis carried out uses several methods, among others, SWOT, Critical Success Factors, Value Chain, PEST, and Mc Farlan Strategic Grid. The results of this study is a blueprint of strategic planning that refers to the organizations business plan based on data obtained through the analytical methods used. It will integrate the information produced for administrative and public service needs. organizations strategic objectives in the form of superior prime service will be achieved by implementing an optimal improvement of data processing functions with the support of Information Technology. preparation of IS / IT strategic planning according to the resulting portfolio is expecting to be using in future strategic planning so it can give priority to the activities needed to get optimal results and based on its contribution to the objectives to be achieving.

Keywords
Information System Strategic Plan, Ward & Peppard Framework, SWOT, CSF, Value Chain, Mc Farlan Matrix

Topic
Management Strategic

Link: https://ifory.id/abstract/h4cAGQwvtL3f

Corresponding Author
Suci Elya Intan Suryani

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia

b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia

* markusdiantoro.fmipa[at]um.ac.id

Abstract
The effort of searching for a new stable oxide electrode for supercapacitor is extensively performed. For the conventional capacitor, the capacitive storage could be strongly depend on high dielectric materials. Besides the high capacity, the release rate is one of the crucial issue for supercapacitor. For the latest case, we should improve a total conductivity of introduce other ionic materials in the system. The high ferroelectric materials of perovskite ATiO3 could candidate for high capacitive materials by introducing FC (Functionalized Carbon) with FC stands for enhancing the conductivity and dielectric constant of composite. The new known common supercapacitor materials of FC (Graphene, Acetylene Carbon Black), Mn2O3, and ATiO3 could be a good candidate for high energy density supercapacitor. The new integrated thermoelectric-supercapacitor device lately introduced due to the implementation of thermoelectric under magnetic field. ATiO3 has been synthesized using conventional solid-state reaction with intermediate calcination. The composite FC/Mn2O3/ATiO3 with ethanol adhesive has been fabricated using conventional die pressed. The capacitance as a function of magnetic field was characterized using DC capacitance meter under various magnetic field generated by double coil magnetic generator.

Keywords
magnetocapacitive, capacitance, FC-Mn2O3-ATiO3, magnetic field, supercapacitor

Topic
Electromagnetic Methods

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

Corresponding Author
Pierre Wolter Winowatan

Institutions
a) Department of Metallurgy and Materials, Faculty of Engineering, Universitas Indonesia, Depok, Indonesia
*winowatan.pierre[at]gmail.com
b) Center for Research of Physics, LIPI, Puspiptek Serpong,
Tangerang, Indonesia

Abstract
Titanium dioxide is a promising candidate to be used as anode material for lithium-ion batteries. It has some notable polymorphs such as rutile and anatase, etc. Although several studies revealed that one type of polymorph is better than other polymorphs, comparison between different polymorphs using same synthesis method is still unclear. This research discuss about electrochemical performance between 2 polymorphs of rutile and anatase synthesized by using sol-gel method followed by calcination process. The temperature for calcination process for rutile and anatase polymorps are 480 °C for 8 hours and 850 °C for 6 hours respectively. The synthesis of both rutile and anatase polymorphs has been a success with high purity and no impurity peak shown by XRD result. In this research, a sample of commercial TiO2 is used to make a coin cell battery to compare the performance between other samples. The electrochemical performances are examined by CV, CD and EIS.

Keywords
Rutile; Anatase; Titanium Dioxide; Lithium-ion Battery

Topic
Functional Materials

Link: https://ifory.id/abstract/g4dGDEbYHQze

Corresponding Author
Efendi Mabruri

Institutions
Research Center for Metallurgy and Materials, Indonesian Institute of Sciences

Abstract
The high alloyed austenitic stainless steels such as Fe-15Cr-25Ni type alloys are used in severe environment where a good combination of corrosion resistance and mechanical properties is required in a wide range of elevated temperatures. The high temperature stability of austenitic stainless steels correlates with microstructure of the steels consisted of (-matrix with stable second phases. The alloying elements incorporated into the alloys modify the second phase precipitation and affect the properties. Recently, it is found that the addition of W and Nb into the Fe-15Cr-25Ni steel improved the mechanical propertires and corrosion resistance of the alloys. In this work subsequence investigation has been conducted to clarify the effect of heat treatment on the pitting resistance of the developed Fe-15Cr-25Ni-2W-2Nb steel. The steels were prepared by induction melting following with hot forging and heat treatment. Both the temperature of solution treatment and of aging were varied and the cyclic polarisation were measured on each samples of difference heat treatment temperature. The observation by SEM was taken on some samples for microstructural confirmation. In general, the solution treated sampel had higher pitting potential than the aged ones. The pitting potential increased with the increasing solution treatment temperature. The SEM images showed the precipitation high Nb containing precipitates.

Keywords
pitting resistance, high alloyed austenitic stainless steel, heat treatmen, solution treatment, aging

Topic
Minerals and Complex Materials

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

Corresponding Author
Prasetya Widodo

Institutions
a) Center for Technology of Radiation Safety and Metrology–National Nuclear Energy Agency, South Jakarta, DKI Jakarta, 12440, Indonesia
b) Health Facilty Safety Center-Ministry of Health Republic of Indonesia, Central Jakarta, DKI Jakarta, 10570, Indonesia
c) Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
*cuk.imawan[at]sci.ui.ac.id

Abstract
A colorimetric method for dosimetry is widely used in irradiator facilities due to its simple measurement method and low cost. These type of dosimeters are made from dyes that are sensitive to radiation. Tartrazine is one of the dyes that are sensitive to gamma radiation and safe because it is a food coloring agent. In this study the results of experiments and characterization of dosimeters made from tartrazine liquid dyes were reported. Tartazine liquid used has a pH of 6. This liquid has been tested for gamma exposure in the dosage range of 5-100 kGy. Moreover, the stability of the color of this liquid has been investigated for storage conditions in light and dark for 21 days. The characterization of the liquid dosimeters was carried out using a UV-Vis spectrophotometer. The optical spectrum of the liquid tartrazine shows absorbance peaks at wavelengths of 430 nm. The value of the absorbance peak gradually decreases with increasing value of the gama irradiation absorbed. The dose response from the liquid dosimeters is quite linear for the gamma dose range of 5-30 kGy on the logarithmic scale. Besides that, the color of the liquid shows good stability in light and dark storage conditions. Based on these results it can be concluded that this liquid tartrazine is a good candidate as a routine dosimeter for irradiation applications that require a wide range of doses.

Keywords
liquid tartrazine; dosimetry; gamma radiation; colorimetric

Topic
Functional Materials

Link: https://ifory.id/abstract/K2qBH3tZ7yUv

Corresponding Author
Setyawan Purnomo Sakti

Institutions
Departmet of Physics, Brawijaya University
Jl Veteran, Malang 65145, Indonesia
sakti[at]ub.ac.id

Abstract
Quartz Crystal Microbalance (QCM) sensor coating layer as selective and sensitive material was usually made in a thin layer to avoid any damping effect on the sensor. Coating thickness in the range of nanometer was typical. The used of a thick polymer coating was known in the range of less than 3(mu)m. Usually the coating layer was prepared to support the QCM sensor to work as a mass sensitive device based on the Sauerbrey equation. A targetted biomolecule or chemical molecule was seen as a pure deposited mass on top of the sensor in the vertical direction. In our work, an ultra-thick polystyrene coating was done. The polystyrene film was formed using a spin coating method. A high concentration of polystyrene solved in toluene was used for the coating. The impedance spectrum of the QCM sensor before and after coating was measured. The fundamental resonance frequency of the sensor changed bigger than 2% and less than 5% of its initial frequency. We observed that the coating contributed little effect to the electrical impedance of the QCM sensor. The calculated film thickness was up to 8.8(mu)m, which was ten times thicker than common film coating used on a QCM sensor. The impedance of the sensor shows that the coating was still considered as glassy film.

Keywords
QCM sensor; ultra-thick film; polystyrene

Topic
Functional Materials

Link: https://ifory.id/abstract/yf9z8qEMmvnj

Corresponding Author
Bagas Pratama

Institutions
1) Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Surakarta, Indonesia
*rsuryana[at]staff.uns.ac.id

Abstract
Porous silicon (PSi) is formed on n-type silicon wafers Si (100) and Si (111) substrates using electrochemical anodization method. Silicon wafers were anodized in HF (40%) dan ethanol (99%) solution with a ratio of 1:1 at a current density of 10 mA/cm2, 20 mA/cm2, 30 mA/cm2, 40 mA/cm2, dan 50 mA/cm2 for 30 minutes. The reflectances of PSi were characterized by UV-Vis spectroscopy and the depth and pore size of PSi were characterized by AFM. The reflectance of PSi on both Si(100) and Si(111) substrates decreased with increasing the current density while AFM images confirmed that the depth and the pore size increased with increasing the current density. It is concluded that PSi could be applied as an anti-reflective surface in solar cell devices. The reflectance of PSi on Si(100) substrate had a value smaller than it is on Si (111) substrate. This indicated that the crystal orientation of (100) can be etched easier than the crystal orientation of (111).

Keywords
Si (100), Si (111), n-type, electrochemical anodization, reflectance, UV-Vis, AFM

Topic
Nano Science and Technology

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

Corresponding Author
Yofentina Iriani

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret. Jl Ir. Sutami 36A, Kentingan, Surakarta 57126

b) Department of Physics, Postgraduate, Universitas Sebelas Maret. Jl Ir. Sutami 36A, Kentingan, Surakarta 57126

Abstract
The effect of Lanthanum (La3+) addition on microstructure, optical and electrical properties of Barium Titanate (BaTiO3) were prepared by using Chemical Solution Deposition (CSD) method. The addition of mole La3+ were 10% and 15% on 0,5 M solubility. Spin coater was used in deposition process of thin films with speed 4000 rpm for 30 seconds. The sandwich-structured Ba1-xLaxTiO3 thin films were grown on a quartz substrate. Thin films were annealed at 850oC with holding time of 1,5 hours. X-Ray Diffraction (XRD) analysis showed the formation of perovskite crystal (ICDD data base PDF

Keywords
CSD, lanthanum, BaTiO3, bandgap energy

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/9LAMBG4Zkcxn

Corresponding Author
Asdim Asdim

Institutions
a) Division of Physical Chemistry, Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Jl. W.R Supratman, Kandang Limun 38371 A Bengkulu, Indonesia.
*asdim[at]unib.ac.id
b) Division of Inorganic Chemistry, Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Jl. W.R Supratman, Kandang Limun 38371 A Bengkulu, Indonesia.

Abstract
The green synthesis method of SnO2 nanocrystals have been developed in recent year in view of their potential application as photoelectrode in dye-sensitized solar cells (DSSCs). The effect of the size and morphology of SnO2 nanocrystals on efficiency of DSSCs have been reported. In order to prepare SnO2 nanocrystals with different size and morphology, several synthesis methods have been developed. In this report, the facile green synthesis of SnO2 nanocrystals by hydrothermal method at relatively low temperature using plant extracts in acid and base solution have been carried out. SnO2 nanocrystals as synthesized were characterized by an X-Ray Diffractometer (XRD) and a Scanning Electron Microscope (SEM). The results showed that the all products were phase SnO2 nanocrystals which obviously showed by the XRD pattern. Furthermore, SEM images analysis clearly showed the morphology different of SnO2 nanocrystals synthesized with and without the addition of plant extracts. These results indicated that the properties of SnO2 nanocrystals could be controlled using plant extracts in the solution reaction.

Keywords
SnO2; Nanocrystals; Hydrothermal method

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/Wn6chwaBFxKJ

Corresponding Author
Ilham Syahidi

Institutions
1 ) Physics Department, Faculty of Mathematic and Science Sebelas Maret University, Surakarta, Indonesia

Corresponding author : *rsuryana[at]staff.uns.ac.id

Abstract
Porous silicon (PSi) has been fabricated using electrochemical anodization method on n-type Si (111) substrate with methanol as an anodizing solution. The ratio of the anodization solution was 1 : 1 for HF and methanol. Platinum was as a cathode while silicon was as an anode. Duration of Anodization time was maintained constant that is 30 min with a variation of current density i.e. 10 mA, 20 mA, 30 mA, 40 mA, and 50 mA. Then the samples were cleaned by boiled H2SO4 and H2O2 with ratio 3:1 and overflow for 5 min. The optical reflectance of the sample was determined using UV-Vis Spectrophotometer and surface morphology was observed using AFM. The reflectance decreased with increasing the current density. AFM images confirmed that pores size and depth increased with increasing the current density. Due to PSi affect reflectance value, it is concluded that PSi can be applied as an anti-reflective material in solar cell devices.

Keywords
Si (111), n-type, electrochemical anodization, reflectance, AFM

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/nLHgdZJDBE8v

Corresponding Author
Cipta Panghegar Supriadi

Institutions
a) Department of Metallurgy and Materials, Faculty of Engineering, Universitas Indonesia, Depok, Indonesia
*cipta.panghegar[at]gmail.com
b) Center for Research of Pysiscs, Lembaga Ilmu Pengetahuan Indonesia, Puspiptek Serpong, Tangerang, Indonesia

Abstract
The emerging Portable Device and Electrical Vehicle require safe, portable, and high-power energy sources which may be supplied by Lithium Ion Battery (LIB). The currently available carbon anode in LIB’s system posseses some safety issue such as volume expansion during lithiation/delithiation and formation of solid electrolyte Interphase (SEI) that can be harmful for battery. Accordingly, anode material Li4Ti5O12 (LTO) shows a promising properties that may overcome safety problems caused by carbon anode. However, the low electronic and ionic conductivity are main bottleneck for its application. This research focuses on synthesizing LTO using nano TiO2 synthesized through Sol-gel method. Moreover, the effect of TiO2 crystalline size will be discussed as well. Crystalline size of TiO2 is adjusted by varying calcination temperature at 300oC; 400oC; and 500oC and heated for 6 hours. The crystallite size shown by X-ray diffraction patterns are 7,71 nm ; 15,16 nm ; 23,99 nm, respectively. Furthermore, The obtained TiO2 powder is sintered. The result shows that relatively pure LTO is successfully synthesized using 15,16 nm TiO2. The coin cell are assembled to analyze Li4Ti5O12 anode electrochemical performances.

Keywords
Lithium Ion Battery, Lithium Titanate, Sol gel

Topic
Functional Materials

Link: https://ifory.id/abstract/vD7qLcpJCwn6

Corresponding Author
M Tommy Hasan Abadi

Institutions
(a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
(b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
*Corresponding author’s email: nandang.mufti.fmipa[at]um.ac.id

Abstract
One of third generation solar cell that can produce high efficiency with strong absorption power is perovskite. The good efficiency of perovskite depend on the stability structure and morphology homogenous. Recently, perovskite with CH3NH3PbI3 inorganic-organic compounds appear as solar cell that perform well even with small active regions. In this study, CH3NH3PbI3 perovskite was synthesized by two step deposition. The disadvantage of this method is that lead iodide (PbI2) material which is only dissolved in DMF solvents has not succeeded in forming perovskite CH3NH3PbI3 so that it has an impact on the performance of solar cells. The addition of DMSO as PbI2 solvent by controlling the composition of DMF/DMSO increased the homogenity of the morphology of perovskite solar cell and the efficiency obtained was better than using DMF solvents only. Characterization of samples using XRD to determine the perovskite crystal phase and structure, SEM to determine the morphology of the sample, and solar simulators to determine the efficiency of perovskite solar cells.

Keywords
Perovskite Solar Cell; DMSO Solvent; PbI2; CH3NH3PbI3; Morphology

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/39YLj8QGDW6C

Corresponding Author
Is Fatimah

Institutions
Kampus Terpadu UII, Jl. Kaliurang Km 14, Yogyakarta, Indonesia 55584

Abstract
Surface modification onto Salacca skin with sodium dodecyl sulfate (SDS) for enhancement adsorption capability toward methylene blue (MB) and batik’s wastewater has been conducted. Research was focused on the change of physicochemical character of adsorbent using gas sorption analyses and Fourier-Transform Infra-Red (FTIR) spectrophotometric analysis. Performance of modified Salacca skin for MB and batiks wastewater was evaluated in batch adsorption system for kinetics and optimization study. The results showed that surface modification is in favor for enhancement the adsorption of MB and batik’s wastewater. The presence of functional group on surface plays important role for the surface interaction to enhance adsorption capability. The equilibrium data of MB adsorption by batch system reveals that the adsorption kinetics obey pseudo-first order kinetics and the mechanism described the more intensive surface interaction by surfactant modification.

Keywords
Adsorption; Batik’s wastewater; Biosirbent; Dye; Surfactant

Topic
Functional Materials

Link: https://ifory.id/abstract/FEKBwf9ADnGU