Indonesia Conference Directory

Corresponding Author
sheila andita putri

Institutions
Telkom university

Abstract
In Plered, the activity of making clay crafts has been carried out for generations. Located in the southern region of Purwakarta Regency, the pottery industry is located in Anjun Village, Citeko Village and Pamoyanan Village. That said, the activity of making pottery in this region began in 1904. At present, the industrial pattern that applies in Plered is work based on orders from clients in large numbers. Unfortunately, these offline sales have not yet reaped maximum results because of the quiet visitors who come to Plered. Data estimation from various sources indicate that 2020 will be a milestone for significant changes in Indonesia. That means there is a large enough market potential for Plered ceramic craftsmen to market their products in addition to relying on clients orders. For this reason, the development of Plered ceramic product design is needed to develop the Plered ceramic industry. This study aims to analyze the potential of the Plered ceramics industry to produce alternative ceramic designs through methods that can be applied among craftsmen to develop products that are in line with the target market.

Keywords
industrial ceramics, ceramic tiles, product recommendations

Topic
Design

Link: https://ifory.id/abstract/QyjEk7zYVfe8

Corresponding Author
Mahendra Nur Hadiansyah

Institutions
Bachelor Program of Interior Design, Telkom University.
Jalan Telekomunikasi No.1, Terusan Buah Batu, Kabupaten Bandung.
*mahendrainterior[at]telkomuniversity.ac.id

Abstract
The existence of Korean culture has been recognized by Indonesian people including Bandung, makes the restaurant owners compete each other to win the hearts of the consumers who like korean food. Korean restaurant in Bandung not only over the signature dishes from Korea, but the interior also give chance to feel the different environtment and attract the consumers. Mujigae is one of the Korean restaurant carrying modern culture that called Halyu wave including Korean pop or known with K-pop. This study has a purpose to analyze how the achievement and implementation of K-pop themed in interior design with the modern style. Descriptive qualitative through observation is the method that used in this study and validated by Discussion forum group. In an effort to achieve Korean atmosphere, this restaurant not only use the fame of K-pop artists but also implements the characteristics of K-pop that are vibrant, cheerful, colorful, and energetic. The Korean atmosphere is increasingly manifested through other supporting elements such as tableware used, videos and music that playing K-pop songs. The results shows the implementation of K-pop-themed in the interior are applied to several elements, such as furnitures, murals, two-dimensional decorations, lighting, and audio visual.

Keywords
K-pop, Korean, restaurant, mujigae, interior elements

Topic
Design

Link: https://ifory.id/abstract/aGRKqvZLd8m2

Corresponding Author
Hendi Anwar

Institutions
Telkom University
School of Creative Industries

Abstract
Colonial architecture was present in Indonesia through the work of Dutch architects and was intended for the Dutch who lived in Indonesia around the beginning of the 17th century until 1942. At first, Europeans came to Indonesia to trade, then they built houses and settlements in several cities close to ports in Indonesia. Their houses generally have walls made of boards and wood with roof coverings made of palm fiber, but conflicts often occur, so the fortress begins. Inside, several buildings were built from brick materials imported from European countries. After that, they built many houses, churches, and public buildings with urban planning and architecture similar to their home countries. The story of colonial houses in Bandung began around 200 years after the Dutch East Indies government built a connecting road between Bandung and Batavia, Bandung was nominated as the capital of the Dutch East Indies, by moving Batavia to Bandung. The preparatory steps include building government buildings and settlements with a good spatial plan. So that at that time, the city of Bandung experienced intensive development. Gemeente-werken Bandung with the command of Ir. F.J.L. Ghijsels built 750 modern buildings for the current size, as part of the preparation for the capitals move. The development also made Bandung save a lot of Indo-European-style architectural works. This made Bandung at that time nicknamed The Most European City in the East Indies.

Keywords
Architecture, Colonial, Conservation

Topic
Culture

Link: https://ifory.id/abstract/mn3UqkW2TCpf

Corresponding Author
Maya Dewi Dyah Maharani

Institutions
1 University of Jakartas Sahid, Department of environmental engineering, JL. Prof. Dr. Supomo SH No. 84, Tebet, South Jakarta 12870, mayasudarsono[at]gmail.com, maya[at]usahid.ac.id

Abstract
MODEL OF AGRO-ECO-VILLAGE BY USING INTERPRETATIVE STRUCTURAL MODELING FOR IMPROVING SUSTAINABLE DEVELOPMENT. Governance of agricultural waste and potential environmental problems such as pollution, damage ecosystems, degradation and depletion of natural resources in rural areas require serious attention from the Government. The purpose of the study is to formulate of Model of agro-eco-village by using Interpretative Structural Modeling for improving sustainable development. Method study of using Interpretative Structural analysis Modeling (ISM). This method uses expert judgment in data retrieval. Final results showed the consistency of the reachability of expert opinions (93-100)%. The ISM method result as the key institutional at the village is Farmer-owned enterprise or business entity belonging to the Village. The key purpose is the farm activity monitoring is driven to produce low carbon. The required changes are activities to recycle agricultural biomass resources and strengthening of the system of rural agribusiness. The affected sectors of society are the Farm Worker and Farm Tourism. As the key indicator is the increased exchange rate of the farmer, and the key constraints are the regulation of rural water resources governance.

Keywords
model, agro-eco, village, ISM

Topic
Other Agricultural and biosystems topic

Link: https://ifory.id/abstract/gXBPxnML9jaY

Corresponding Author
Putry Sari Rahmadyah Pulungan

Institutions
State University of Medan

Abstract
This study are aims to find out the effectiveness of monetary policy transmission on exchange rate passthrough in Indonesia for period 2004.1-2018.4. The variables consist of this sudy such as exchange rate, net exports, difference of BI rate and the fed rate, foreign exchange reserves and inflation. This study use secondary data through Bank Indonesia office and The Federal Reserve which analyzed by Vector Error Correction Model (VECM) and eviews 10 program. The result during the period of this study shows that transmission direct exchange rate passthrough is more effective to affect the inflation. While transmission indirect exchange rate passthrough is less effective to affect the inflation which reflects the price stability as the ultimate objective of monetary policy in Indonesia.

Keywords
Exchange Rate; Net Exports; Difference of BI Rate and The Fed Rate; Foreign Exchange

Topic
Economics, Business and Management Education

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

Corresponding Author
Windi Naully

Institutions
a) Sports Education, Post Graduate Program, Universitas Negeri Medan
*windinaullypjkrcreg[at]gmail.com

Abstract
This study aims to determine the increase in learning outcomes of passing chest passes through a learning variation approach. This type of research is Classroom Action Research. The research subjects were 35 students, consisting of 21 students and 14 students. The research instrument observation sheet and portfolio, data analysis techniques using percentages. The results showed: (1). In the first cycle, 19 (54%) students had finished studying, while the remaining 16 (46%) students had not yet completed. The average value obtained is 75. (2). In cycle II, there were 27 (77%) completed, while the rest, 8 (23%) had not yet completed study. The average value obtained reached 79. The conclusion that the results of passing chest pass learning can be improved by the variation learning approach in the XI grade students of Karya Bakti Private High School. Langkat

Keywords
passing chest pass, variasi pembelajaran, bola basket.

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/JB2tZfUbRMqa

Corresponding Author
Fitrah Miko

Institutions
a) Phisycal Education, Post Graduate Program, Universitas Negeri Medan
*fitrahmiko27[at]gmail.com

Abstract
The research aims to find out the active role of KONI in Central Aceh Regency in the badminton sport in 2016. The study used a survey method with research subjects KONI management, PBSI management, club management, coaches and athletes. The research instrument was in the form of a questionnaire. Data analysis techniques use percentages. The results showed that the category was quite good. The conclusion is that the role of the coach of badminton in the Central Aceh District is quite active.

Keywords
Active Role Coaching, KONI, Badminton

Topic
Economics, Business and Management Education

Link: https://ifory.id/abstract/xwnXMQqrK8Gm

Corresponding Author
Rasmin Simbolon

Institutions
1. Universitas Negeri Medan
2. Dinas Pendidikan Kota Medan

Abstract
One of the competencies required from a teacher is how to create a Classroom Action Research (CAR). The problems faced by teachers in starting classroom action research are the inability of the teacher to formulate a problem statement and how to design a class action. This condition causes low learning outcomes obtained by students. In this study, the assignment, feedback and revision models (AFR) have been applied to improve the competence of teachers in developing CAR. The AFR model is implemented through workshop activities where the participants are a group of teachers. Each cycle in the CAR utilizes four phases of activities including planning, action, observing, and reflective. These stages continue until the problem is considered to have been resolved. After the workshop, teacher competence for cycle one was measured and found to be increase from 48.5 in the first lesson to 67.60 in the second lesson. Furthermore, it increased to 82.85 in the third lesson. For the cycle two obtained that the teacher competence to be increase from 52.89 for the first lesson to 71.94 in the second lesson and increase to be 86.57 in the third lesson. The teacher competence improvement also achieved on cycle three, where from 66.62 to 72.99 then to be 97.79 for thee first lesson, second lesson and third lesson respectively. The average increases of teacher competence for three cycles are 33.22%. Based on the results can be explained that the AFR workshop model, the teacher competence to create CAR is increasing.

Keywords
Classroom Action Research, assignment, feedback, revision

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/UyzRa4kDmLZu

Corresponding Author
Tria Anggreini

Institutions
Universitas Negeri Medan

Abstract
The purpose of this study was to analyze the science process skills and creative thinking of students who were taught by the scientific inquiry learning model using mind mapping. The study was conducted on the eighth grade students of Tunas Harapan Private Middle School in Sayurmatinggi Village, Ujung Padang Learning Year 2018/2019. This type of research includes quasi-experimental, quasi-experimental research design with two groups pretest-posttest design. The research instrument used was essay-shaped test for science process skills and students creative thinking abilities. The conclusions obtained are; (1) Students physical science process skills with scientific inquiry learning using mind mapping are better than science process skills students use conventional models; (2) Science process skills of students in the group of creative thinking skills above the average are better than the creative thinking skills below the average; (3) In this study, krative thinking skills above the dominant average improve the science process skills of students in the scientific inquiry model using mind mapping rather than in conventional learning

Keywords
Scientific Inquiry, Mind Mapping, Science Process Skill

Topic
Education and Research Global Issue

Link: https://ifory.id/abstract/hDjR78VdkeKy

Corresponding Author
Nur Aulia Khairani

Institutions
Universitas Negeri Medan

Abstract
This study aims to produce moodle e-learning media that is feasible to use as a medium for learning the physics of geometric optical matter. The main problem is in the current era of industrial revolution 4.0, teachers as the front guard in the world of education are able to improve competence in facing the era of industrial revolution 4.0. One of the demands is that the teacher must be able to develop learning media according to the industrial revolution 4.0 as developed in this research, namely moodle e-learning media. This type of research is Research and Development and the development model used is the model of the development of 4-D. The instruments used in this study include learning device instruments and data collection instruments. The results of the study are that it has moodle e-learning media that is suitable for use as a medium for learning the physics of geometric optical matter

Keywords
Development, Moodle, E-Learning Media

Topic
Education and Research Global Issue

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

Corresponding Author
Mawarni Saputri

Institutions
Universitas Negeri Medan

Abstract
The purpose of this study is to find out the steps for developing instruments and characteristics of creative thinking skills test on momentum material and impulses. The research subjects were students of class X IPA 1 Cut Nyak Superior High School Dhien Langsa who had received momentum and impulse material. The type of research used is research and development (R&D). The research conducted refers to the development of a product in the form of a creative thinking skills test instrument. Before the test instrument for creative thinking skills was tested on students, expert validation tests were carried out first. The subject of product development consists of content or material experts, instrument experts, and linguists. The data analysis technique used in this study is descriptive analysis techniques. The conclusions obtained after the research are the process of developing creative thinking skills test instruments for physics lessons at Cut Nyak Dhien Langsa High School through several stages, namely the analysis of requirements and characteristics, stages of designing or designing grids and questions, product validation stage, and trial stage product; The characteristics of the test instruments for creative thinking skills developed were declared valid with high interpretations, reliable with very high interpretations, and the level of difficulty and differentiation were classified as good; The creative thinking skills of Cut Nyak Dhien Langsa High School students in class X are classified as good (creative).

Keywords
Development, Creative Thinking Skills Test

Topic
Education and Research Global Issue

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

Corresponding Author
Bajoka Nainggolan

Institutions
1Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan, Indones

Abstract
Abstract, This research is descriptive with the aim of developing project-based chemistry practicum guides and the characters of Redox and Electrochemical Reaction materials according to BSNP standards. The sample consisted of 2 lecturers and 2 chemistry teachers, 30 students experimental class and 30 students control class at the Medan 6th Senior High School, three practicum guides of Erlangga (A) publishers, Bumi Aksara (B), Duta Nusantara (C),. The study used the ADDIE method and the data was processed descriptively. Questionnaires distributed to the leacturer and teacher samples and found that content, language, presentation, and graphycs feasibility scores were 3.53., 3.46., 3.50., and 3.53 respectively, the average score was 3.32., which means that the practicum guide developed is very valid. Data analysis with ANOVA, obtained the average scores of student outcomes in experimen class was higher than control class or 81.5% > 73.8%. Then the average phsychomotor scores of experimen class was larger than control class or 84, 64 > 82.78. In addition, the affective scores of experimen class was larger than control class or 78.42 > 76.38. The hypothesis tested with one way ANOVA at the significant level of alpha = 0.05, and found that tcount> ttable, (4.536 > 1.697). It is concluded that the Innovative Chemistry Practicum Guides developped is highly very good, suitable for use in Senior High School.

Keywords
Keywords: practicum guides project-based and the character, learning outcomes, redox and electrochemical reaction materials.

Topic
Education and Research Global Issue

Link: https://ifory.id/abstract/hXP6QWbMCHNT

Corresponding Author
Arman Doli Subandi Tumanggor

Institutions
Universitas Negeri Medan

Abstract
This study aims to determine the process of theoritical service in the utilization of laboratory tools and materials and to produce an information system design that can improve the utilization service of laboratory tools and materials in Physics Laboratory of State University of Medan. This type of study is Research and Development (R & D). The procedures of this study were needs analysis, design, development and implementation. The sample which is used in this study were lectures and students of Physics Department. Product testing is devided into 4 stages : validator test, individual test, small group test, and field test. The instruments used in this study was a questionnaire in the form of responses and ratings from Physics lectures and students which is about the design of graphic and software, information system, and the service of tools and materials used. Average percentage of design testing by expert is 97,85%, information system by expert 97,7%, tools and materials management by expert 85%, individual testing 97,4%, small group testing 97,2%, and field testing 98%. The conclusion of this study is the product be in the form of Information System Application is categorized as Very Good with average percentage of all testing 95,53% and be worthy of being used as an information system for the utilization of tools and materials at the Physics laboratory of the State University of Medan.

Keywords
Application, Development, Laboratory, Service

Topic
Education and Research Global Issue

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

Corresponding Author
Agung Nugroho Pramudhita

Institutions
Department of Information Technology,
State Polytechnic of Malang

Abstract
The website is a communication tool that is used as an intermediary to share the latest news. The website of the Information Technology Department - Malang State Polytechnic (JTI-Polinema) is also a means of communication to share the latest activities and information about JTI. From January 2018 to November 2018, the news uploaded is only six content. This is not proportional to the number of activities available at the JTI. This is because there is only one type of user, the admin who can fill the website content. And the admin does not always know the activities in the information technology department. This study aims to develop an application to fill the website content of the Information Technology Department in state polytechnic Malang-s website by adding one more type of user, namely students and also make the interface look better and easy to use. This application allows students to upload articles about departmental activities, competitions, workshops and other information they know. The Development of this application uses Kanban which is one of the lean software development methods (lean method). Based on validation testing this application is able to meet all the main functional requirements. while the usability test results based on usefulness, ease of use, ease to learn and satisfaction shows a high average value of 85%, it can be concluded that this application is acceptable and easy to use

Keywords
website content; kanban; JTI

Topic
Information Systems Technology

Link: https://ifory.id/abstract/p3X2xeKAD7HB

Corresponding Author
Amini Amir Abdullah

Institutions
Universiti Putra Malaysia and UNIKL

Abstract
Abstract: This paper is prepared for observing the role of Islamic banking institutions in assisting Muslim Halal Entrepreneurs (MHE) who have obtained business financing from Islamic banking institutions in Malaysia. Based on the analysis of the interviews conducted by the researchers on Islamic banking institutions, it shows that Islamic banking institutions have been instrumental in helping Muslim Halal Entrepreneurs (MHE); either to start a business or expand existing business. In this study, the researchers used the method of in-depth interviews. Interview data were analyzed based on the themes of the study that have been identified by the researchers. The findings of this study have shown that Islamic banking institutions have played their extensive role in helping Muslim Halal Entrepreneurs (MHE) in achieving success in the field of entrepreneurship in the country.

Keywords
Business Financing, Halal Muslim Entrepreneurs, Islamic Banking Institutions

Topic
Islamic Banking, Finance, Insurance, and Sharia Accounting

Link: https://ifory.id/abstract/hRur46APBxfb

Corresponding Author
Puji Handayati

Institutions
Universitas Negeri Malang
Universitas Adi Buana

Abstract
The hybrid contract concept emerges as a finding of innovation of Islamic banking products to fulfill the needs of banking transactions in sharia banks. A transaction in a financial institution must not be separated from a set of financial statements in the accounting system. As a Sharia-operated bank, it must apply the concept of sharia accounting, including in accounting records of hybrid contract transactions. Using the qualitative method of hermeneutic phenomenology, this study concludes that in practice, the accounting records at the beginning of the transactions of mura> bah wakalah wilalah is directly on the ownership of the assets of mura> bah} ah by the bank. Whereas, before the asset belongs to the bank (which is represented by the customer), there is a previous contract that is wakalah. The occurrence of this wakalah contract is not done in accounting records. Therefore, if only look at the accounting records of a bank, it will not be seen clearly a transaction with the agreement mura> bah} ah bil wakalah. Whereas, in accounting calculation by musya> rakah mutana> qis} ah contract, accounting treatment that acknowledged the financing of musya> rakah, then in its presentation, there is certainly a Financial Position Report (balance sheet) showing the financing musya> rakah as a whole.

Keywords
Hybrid Contract, Sharia Accounting, Accounting Recording

Topic
Islamic Banking, Finance, Insurance, and Sharia Accounting

Link: https://ifory.id/abstract/KeUR4jbCFvnW

Corresponding Author
Puji Handayati

Institutions
Universitas Negeri Malang

Abstract
The purpose of this research is to determine the form of syari-ah economic in Samin-s prespective. This research uses ethnomethodology approach. The results showed that the local wisdom of the Samin is gotong-royong, honest, patient, trokal (work), and narimo (sincere). The result also indicates that there are 3 types of Arisan in the Samin namely Arisan biasa, Arisan gotong-royong and Arisan lembu. In the context of Arisan tradition, the value of local wisdom gotong-royong is internalized in the activity of savings and loan in Arisan gotong-royong and discussion in Arisan lembu. Meanwhile, the value of wisdom honesty is internalized in the accountability of financial records of arisan. Implementation of Arisan tradition background of local wisdom of Samin society can actually be classified in Islamic economic system where in execution has no system of interest or usury. Arisan system that exist in Samin tribe is almost same with mudhorobah principle in syariah accounting system

Keywords
The purpose of this research is to determine the form of syari-ah economic in Samin-s prespective. This research uses ethnomethodology approach. The results showed that the local wisdom of the Samin is gotong-royong, honest, patient, trokal (work), and narimo (sincere). The result also indicates that there are 3 types of Arisan in the Samin namely Arisan biasa, Arisan gotong-royong and Arisan lembu. In the context of Arisan tradition, the value of local wisdom gotong-royong is internalized in the activity of savings and loan in Arisan gotong-royong and discussion in Arisan lembu. Meanwhile, the value of wisdom honesty is internalized in the accountability of financial records of arisan. Implementation of Arisan tradition background of local wisdom of Samin society can actually be classified in Islamic economic system where in execution has no system of interest or usury. Arisan system that exist in Samin tribe is almost same with mudhorobah principle in syariah accounting system

Topic
Halal Lifestyle, Fashion, Travel and Tourism

Link: https://ifory.id/abstract/EprW7QcdDhjY

Corresponding Author
Dhaneswara Al Amien

Institutions
a) Chalmers University of Technology
Chalmersplatsen 4, 412 96 Göteborg, Sweden
*amien[at]student.chalmers.se;
b) Universitas Pertamina
feradwisetyani[at]universitaspertamina.ac.id;
c) Institut Teknologi Bandung
rajinsihombing[at]gmail.com

Abstract
As one of the biggest maritime nation in the world, Indonesia has big advantages and potential with its long coastline. Part of the maritime industry that Indonesia can provide is the port services. The port development hoped to increase an area income by let the business opportunity growing through the ease access of logistics, but on the other hand, the port development causing negative effects on the side, such as biodiversity risk and environmental issue such as air, water, and noise pollution. The biggest reference in this study is the Global Goals for Sustainable Development (SDGs) set by United Nation (UN) General Assembly. In this study, the vision of United Nation (UN) for the year of 2030 will be considered and compared to the current requirement of Indonesian-s port study of which already put the environmental issues to be addressed. As a result, there will be challenges and inputs for the authorities as the stakeholder in Indonesian Port Planning study.

Keywords
Port Planning, UN SDGs

Topic
Ocean Engineering and Technology

Link: https://ifory.id/abstract/U4FrGPZ2CKNw

Corresponding Author
Dwi Fajriyati Inaku

Institutions
a) Aquatic Resources Management, Fisheries Department, Faculty of Marine Science and Fisheries, Hasanuddin University
Jl.Perintis Kemerdekaan Km.10, Tamalanrea, Makassar 90245, Indonesia
b) Marine Science Department, Faculty of Marine Science and Fisheries, Hasanuddin University
Jl.Perintis Kemerdekaan Km.10, Tamalanrea, Makassar 90245, Indonesia

Abstract
Coastal is an area that vulnerable for change, especially along the shoreline. The changes can occur in the form of abrasion or accretion. Many factors could be the causes of shoreline changes; one of it is the existence of mangrove ecosystem. Physically, the function of mangrove ecosystem is to protect the coastal area from the wave which can cause an abrasion. It also functions as sediment trap which lead to the accretion. The aim of this research is to know the relationship between the existence of mangrove and the shoreline changes along the Takalar Regency. This research was comparing two years of Landsat Imagery (1998 and 2018) to map the mangrove and the shoreline. The shoreline changes were analyzed using Digital Shoreline Analysis System (DSAS) application, meanwhile the mangrove density was analyzed using Normalized Difference Vegetation Index (NDVI) analysis. Results show that for 20 years, shoreline changes caused by abrasion was 147,03 m or 7,38 m/year, and changes caused by accretion was 135,34 m or 6,79 m/year. Mangrove area has increased 566,37 Ha along the Takalar Regency shoreline during these 20 years. The relationship analysis between shoreline changes with mangrove density were done using simple regression. The result shows that the coefficient regression number was 0,190, which mean a weak relationship. Nonetheless, F-test shows a positive relation, which means there were influences between shoreline changes and mangrove density; if the mangrove-s density is high, then the shoreline will tend to increase (accretion). On the other hand, if the mangrove-s density is low then the shoreline will tend to decrease (abrasion).

Keywords
Shoreline changes, Mangrove, Takalar, DSAS, NDVI

Topic
Coastal and Ocean Dynamics

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

Corresponding Author
Hani Kurniawati

Institutions
(a) Departemen Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung,
Jl. Ganesha no. 10 Bandung, Indonesia, 40132
*hanikurniawati[at]students.itb.ac.id
*inge[at]fi.itb.ac.id

Abstract
This paper report the results of experimental study for electrofreezing of a salt hydrate-based phase change material CaCl2.6H2O to reduce the supercooling effect.The experiment was performed by using DC voltage and 0.3 mm diameter of copper electrode. The time-dependent temperature is was measured using thermocouple data logger which is connected to a computer. The parameter variation consist of the magnitude of applied electric field and interval time for field application. It turns out that the minimum amplitude of applied field is about 700 V, and the supercooling degree tend to decrease with the increase of applied field. The supercooling degree also changed with the interval time for the applied field, although its variation still need to be further clarified. From this experiment, it can be concluded that DC voltage affects the supercooling degree of CaCl2.6H2O and help to create the nucleation process.

Keywords
Electrofreezing, Solidification, Salt Hydrate CaCl2.6H2O, Supercooling

Topic
Functional Materials

Link: https://ifory.id/abstract/2a3QKuFYzHc4

Corresponding Author
Kormil Saputra

Institutions
a)Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia
b)Research Center of Minerals and Advanced Materials, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5 Malang 65145, Indonesia
*Corresponding Author’s Email: sunaryono.fmipa[at]um.ac.id

Abstract
Availability Natural Iron Sand that abundant in Indonesia as the main source of ingredient magnetic is a potential raw material for synthesizing of Mn0.25Fe2.75O4/AC. Preparation of Mn0.25Fe2.75O4 /activated carbon (AC) has been successfully synthesized by using the co-precipitation method. Furthermore, the variations of AC mass in Mn0.25Fe2.75O4/AC filler composition also has been done to find out the effect of nanostructural and magnetic Properties from the contribution of Mn0.25Fe2.75O4/AC that characterizes by using X-Ray Diffraction (XRD) and Vibrating Sample Magnetometer (VSM) instrument respectively. The particles size of Mn0.25Fe2.75O4/AC with the filler of AC 0.1, 0.2, and 0,3 g by using XRD characterization is 7.4, 3.67 and 11.8 nm recpectively. Based on VSM Characterization, the value of Magnetization saturation of Mn0.25Fe2.75O4/AC is 0.77, 0.003, and 0,002 emu.gram-1 with the filler of AC 0.1, 0.2, and 0.3 g respectively.

Keywords
nanostructural, Mn0.25Fe2.75O4, AC, and Magnetic Properties

Topic
Functional Materials

Link: https://ifory.id/abstract/tP23ck4JGLpw

Corresponding Author
Iswanti Sihaloho

Institutions
1Departement of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
2Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract
Air filter technology has been applied widely in various fields, e.g. industry, health, and environment. The performance of air filter is characterized by quality factor value which depends on the filtration pressure drop and efficiency. The pressure drop can be obtained by measuring the pressure different of both sides of the filter when the air is flown through it. The filtration efficiency can be measured by counting the number of particles before and after filtration. For this purpose, particles with known sizes are required to obtain the filtration efficiency curve as the function of particle size. Polystyrene latex (PSL) is monodisperse particle with perfect spherical shape. Their size uniformity is advantages for their application as the particle source for the air filter characterization. This paper discusses the air filter characterization using PSL particles with various sizes. The air filters in this study were polyacrylonitrile (PAN) nanofiber membranes, which were prepared by electrospinning technique. The thickness of the PAN membranes were varied by setting the electrospinning time. We also compared the filtration performance of the PAN membranes to the commercial filter. The filtration efficiency to particle diameter curve depicted the most penetrating particle size (MPPS) value of 294 nm.

Keywords
Air filter, Electrospinning, Nanofiber, Polystyrene, MPPS

Topic
Synthesis and Characterization Techniques

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

Corresponding Author
Sulistyowati Sulistyowati

Institutions
a) Departement of Physics, Faculty of Sciences, Institut Teknologi Sepuluh Nopember (ITS), Jl. Arief Rahman Hakim , Surabaya 60111 Indonesia
*suminar_pratapa[at]physics.its.ac.id
b) Department of Physics, Faculty of Mathemathic and Natural Sciences, Universitas Negeri Makassar (UNM), Jl. A. Pangeran Pettarani, Makassar 90222 Indonesia

Abstract
Synthesis and characterization of Fe2TiO5 powders with three different Fe2O3 powders were successfully performed. The Fe2TiO5 powder was produced by solid-state mixing and calcination of natural-ironstone-derived Fe2O3 and commercial TiO2 powders. Production of Fe2O3 powder was done by the dissolution, coprecipitation, and washing (distillation) processes. In this study, the variations of the washing process were carried out by varying the time (hour) and cycles (times) to acquire the highest purity of Fe2O3 in producing Fe2TiO5. The characterization was performed using XRF, XRD, and SEM-EDX. XRF analysis data showed that the washing process has an effect on the amount of Fe2O3 content of the three powders. XRD analysis showed the success of the formation of a single phase from Fe2O3 powders. Meanwhile, the SEM analysis showed that the morphology and size distribution of the Fe2O3 powders changed with different washing processes. Visually, the Fe2O3 powders differed in color. The XRD patterns of the calcined mixtures showed the formation of a single phase only on the sample where the Fe2O3 powder was the darkest in color and exhibited highest content of Fe according to XRF data. said the study concluded that washing process in the synthesis of Fe2O3 affected the purity of Fe2TiO5 powder. Therefore, this study recommends the most reliable Fe2O3 is the black powder because it has the highest Fe content.

Keywords
Fe2O3; Fe2TiO5; distillation route; solid-state synthesis.

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/enBYhwjPUz4g

Corresponding Author
Ayi Bahtiar

Institutions
Department of Physics Universitas Padjadjaran
Jl. Raya Bandung-Sumedang Km. 21 Jatinangor Sumedang Jawa Barat 45363

Abstract
Hybrid organic-inorganic perovskite solar cells have great attention as good alternative for replacing conventional silicon solar cells due to their high-performance and low-cost processing. Nowadays, the power conversion efficiency (PCE) of perovskite solar cells has reached more than 22% which is comparable with commercially available silicon solar cells. However, their low-stability in high humidity hinders the commercialization of perovskite solar cells. Therefore, the research of perovskite solar cells is now shifted to stability study rather than achieving high performance. We have prepared perovskite from mixed methylammonium iodide (MAI) and lead (II) iodide or PbI2 as active layer of solar cells with structure hole-transport-layer (HTL) free consisted of Glass/FTI/TiO2/ZrO2/perovskite/carbon. Due to its instability of MAI on humidity, we have doped MAI with Cesium to improve both performance and stability of perovskite solar cells. We have varied the concentration of cesium ranging from 5% to 20%. The stability study was conducted at room temperature (25C) and room relative humidity (80-85%). We have used white LED with intensity 100 mW/cm2 as light source in current-voltage measurement of solar cells. We have found that the highest PCE and stability of perovskite solar cells was achieved by doping 10% of Cesium.

Keywords
perovskite solar cells, HTL-free, cesium, performance, humidity

Topic
Functional Materials

Link: https://ifory.id/abstract/rGKbzR2nCPmZ

Corresponding Author
Ajeng Eliyana

Institutions
(a) Department of Physics, Physics of Electronic Materials Research Division, PECVD Lab, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40312, Indonesia
(b) Department of Physics, Physics of Material Lab, State University of Makassar, Jl. AP.Pettarani, Makassar 90222, Indonesia

Abstract
Currently carbon nanotubes (CNT) are one of the interesting topics of nanotechnology in the research world. One application is the solar cell which is of concern to photovoltaic researchers, because of the uniqueness of its characterization, namely its wide optical absorption, low resistance and high charge-carrying mobility. In addition CNT has a very large electrical conductivity making it easier to conduct electricity, because it has the potential to increase the efficiency of thin film solar cells. One of the optimization of CNT growth has been done on the growth of metal nanocatalysts or metal catalysts, because it plays an important role in the process of forming CNT tubes. In this research, a preliminary study of CNT thin film deposition was carried out by growing a Nickel (Ni) metal catalyst on a SiO2 glass substrate by evaporation method for 25 seconds and annealing process with temperature variations of 400 0C, 500 0C, and 600 0C for 4 hours. Morphological characterization of Ni metal catalysts using Scanning Electron Microscope (SEM). Metal catalysts are obtained in the form of grains (clusters) that are not homogeneous and still close between one grain to another. The distribution of grain in samples with an annealing 400 0C has an average diameter of 89.2 nm, while the distribution of grain at annealing temperature of 600 0C has an average diameter of 201 nm. The diamater obtained is greater, because the addition of annealing temperature causes the thermal vibrational energy to be larger which allows small grains to disappear and merge with large grains so that the size of the grains gets bigger.

Keywords
Metal catalyst, Nickel, evaporation, SEM, CNT

Topic
Nano Science and Technology

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

Corresponding Author
Nihlatunnur Nihlatunnur

Institutions
a) Department of Physics, Faculty of Sciences, Institut Teknologi Sepuluh Nopember (ITS), Jl. Arief Rahman Hakim, Surabaya 60111 , Indonesia
*suminar_pratapa[at]physics.its.ac.id
b) Synchrotron Light Research Institute (SLRI), Nakhon Ratchasima , Thailand

Abstract
Two LiFePO4 powders have been synthesized, i.e. using natural ironstone and commercial FeCl2•4H2O product as Fe sources, and their characteristics were compared. The x-ray absorption near-edge spectroscopy (XANES) data, Transmission Electron Microscope (TEM) images and Scanning Electron Microscope (SEM) micrographs were used to examine the value of E0 and the oxidation number, determine the crystallite sizes, and determine their morphology, respectively. Results showed that the ironstone- and commercial-based LFP powders exhibited E0 values of 7120.2 and 7119.6 respectively which are both almost equal to FeO and indicates that they have an oxidation number of 2+ as expected. In addition, the crystallite size of the ironstone-based LFP was smaller than that of the commercial one. Moreover, the SEM images showed that the natural LFP was more homogeneous than the commercial LFP.

Keywords
LiFePO4, ironstone, commercial precursor, XANES, crystallite size, morphology.

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/BLuvz6mdef8W

Corresponding Author
Yedija Yusua

Institutions
(a) Department of Physics, Universitas Gadjah Mada, Sekip Utara BLS 21 Yogyakarta,
55281 Indonesia
*adib[at]ugm.ac.id

Abstract
The electronic structure of bulk Hybrid Organic-Inorganic Perovskite (HOIP) CH3NH3PbX3 (X = Br and Cl) has been investigated using a computational method based on Density Functional Theory (DFT). The investigation demonstrates that spin splitting is found when a favoured orientation of organic cation is aligned along the [111], the [101] and the [011] directions. We show that Rashba splitting is induced with the anisotropical character of spin polarization in [111] directions, whereas the unidirectional out-of-plane of spin polarizations are achieved in [011] and [101] directions. By employing k ⃗∙p ⃗ perturbation theory based on symmetry consideration, we find a large spin-orbit strength from these splitting. These findings show that the bulk HOIP CH3NH3PbX3 is a promising material for the development of perovskite-based spintronic devices.

Keywords
First-Principles Calculations, Spin-Orbit Interaction, Spintronics, Condensed Matter and Materials Physics

Topic
Theoretical and Analysis in Materials

Link: https://ifory.id/abstract/aNj89EkMwtqy

Corresponding Author
Harianto Wibowo

Institutions
a) Departement of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
*dianahmadhapidin[at]gmail.com
b) Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract
Particulate matter (PM) was categorized into PM2.5 and PM10 based on its size. Many studies have proofed that tin soldering process generates aerosol in PM2.5 and PM10 category. This solder device is familiar and usually used in home repairs, industrial production sites, and school laboratories. The paper discusses physical and chemical properties of rosin fume which was originated from solder flux heating. The physical and chemical properties of the rosin fume such as particle size, PM2.5 mass concentration, FTIR characterization, SEM and EDX characterization. The size and mass concentration characterization were evaluated using calibrated PM sensor (Honeywell, HPMA115S0-XXX). It was found that PM2.5 mass concentration may reach 650 μg/m3 at 289 °C solder temperature. Whereas, the FTIR spectra (Bruker, Alpha), SEM and EDX were used to analyze the chemical composition and the morphology of the tin wire aerosol which were previously captured by an aerosol sampler.

Keywords
Aerosol; soldering; PM2.5 mass concentration

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/PtwfeJbc6MFn

Corresponding Author
Fanny Arviani Roseno

Institutions
a) Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia
*sugeng[at]eng.ui.ac.id

b) Department of Metallurgy and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia

c) Center for Science and Technology for Advanced Materials, BATAN-Indonesia

Abstract
In this study, fabrication process of Ti6Al4V implant material was developed using powder metallurgy. However, due to the high reactivity of titanium with oxygen at high temperature during sintering, TiO2 layer, which is excellent to corrosion resistance loses its protective properties and allows oxygen to diffuse into the bulk of material. This phenomenon is commonly undesirable because it can be detrimental which decreases the quality of material bonds and mechanical properties that causes brittle material. The Arc Plasma Sintering (APS) method was used to protect the material from the formation of an oxide layer (TiO2) on the Ti6Al4V surface and protects from oxygen diffusion. Sintering process was investigated using a new technology of Arc Plasma Sintering (APS). This sintering technology is carried out using both currents and plasma as a heat source which is capable of performing the sintering process with a very short time in just minutes, and low energy consumption. Sintering was performed on 50 A currents with variations in sintering time for 4 minutes, 8 minutes and 12 minutes. The results of the Arc Plasma Sintering (APS) process were compared to sintering using argon atmosphere at a temperature of 1300oC for 2 hours, 3 hours and 4 hours. The material characterization was performed using SEM-EDS and XRD. The density and hardness testing were measured between two methods of Arc Plasma Sintering (APS) and argon sintering. The results of this study indicate that with the Arc Plasma Sintering (APS) method, the material has better density and hardness with a relative density value of 98.40%, hardness value of 375 HV, and the thickness of the TiO2 surface layer continues to decrease from 16.4 µm to 12 µm without any diffusion of oxygen into the material when compared to argon sintering.

Keywords
Ti6Al4V, High Temperature, Arc Plasma Sintering, Oxidation, TiO2 layer

Topic
Theoretical and Analysis in Materials

Link: https://ifory.id/abstract/Kg47urDQRfhb

Corresponding Author
Nadya Aryani Putri

Institutions
a)Departement of Metallurgy and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Depok, 16424, Indonesia
b)Departement of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Depok, 16424, Indonesia
*sugeng[at]eng.ui.ac.id

Abstract
Titanium is classified as a bio-inert material, so it still does not support osseointegration when compared to bio-active material. This study aims to increase the surface roughness of Titanium, thus increasing the material osseoconductivity, because cells tend to stick and develop in materials with a more rough surface topography. In this study, anodized Ti-6Al-4V at 30, 50, 70, 120 V in H3PO4 and H2SO4 electrolyte, both in concentration of 0.5 and 1 M was successfully prepared to evaluate the effect of parameters applied and its kinetic aspect to the color oxide film, surface roughness and using SEM-EDS, Accretech Surfcom 2900SD3, and scriber. The results show an increase in surface roughness with the increase of voltage and electrolyte concentration because of the surface texture in the form of valleys and peaks. Moreover increasing the voltage will thicken the oxide layer, and changing the color produced. Meanwhile the higher the concentration of the electrolyte will relatively makes the oxide layer less thick. The composition of the oxide layer shows incorporation of Phosphorus and Sulfur ions in both electrolyte, and the results of the scratch resistance test do not show any cracks.

Keywords
Anodizing, Surface Roughness, Ti-6Al-4V, Colored Oxide Film

Topic
Theoretical and Analysis in Materials

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