Indonesia Conference Directory

Corresponding Author
Edy Wibowo

Institutions
1Engineering Physics, School of Electrical Engineering, Telkom University, Jalan Telekomunikasi No.1, Terusan Buah Batu, Bandung, Indonesia.
2Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang (UNNES), Gunungpati, Semarang, Indonesia.
3Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jember, East Java, Indonesia.

Abstract
We report the attempt of utilization rice husk-IR 64 as green adsorbents for degrade methylene blue in aqueous solutions. We attempted to significantly enhance the degradation ability of rice husk, but through a simple process i.e. drying in the sun and boiling in the aquadest. The percent degradation of MB in the solutions was determined by using photometer apparatus, while the change of transparence of the solution after treated by activated rice husk was measured by UV-vis spectrometer. We obtained that the boiling treatment is more effective for enhancing the degradation ability of rice husk than sunbathing process. The use of boiled rice husks could reduce MB in the solutions up to 89%. Indeed, the degradation ability of rice husk-IR 64 can be significantly increase through simple treatment so that it possess a great chance to develop as green adsorbent with marvelous performance.

Keywords
rice husk, IR 64, degradation, methylene blue, aqueous solutions

Topic
Functional Materials

Link: https://ifory.id/abstract/y9UNwknagP3J

Corresponding Author
Sri Wahyuni

Institutions
Universitas Mulawarman

Abstract
Penelitian ini bertujuan untuk mengetahui Faktor-faktor yang mempengaruhi keputusan nasabah memilih transaksi gadai emas pada Bank KaltimTara Syariah Samarinda dan untuk mengetahui variabel yang berpengaruh signifikan. Penelitian ini telah dilakukan dengan mengumpulkan beberapa data yang berhubungan dengan judul penelitian ini, yaitu data mengenai Promosi (X1), Nilai Taksiran (X2) dan Pelayanan (X3). Instrumen penelitian yang digunakan dalam penelitian ini menggunakan data primer dan sekunder, data primer adalah sumber utama dari penelitian ini karena data berbentuk kuesioner yang harus ditanyakan pada masing-masing responden, sedangkan data sekunder hanya untuk melengkapi data berbagai sumber dan instansi terkait. Alat analisis yang digunakan adalah regresi linear berganda dengan bantuan Statistical Package for Social Science (SPSS) 20 yang bertujuan untuk mengetahui ada tidaknya hubungan ketergantungan, dan arah hubungan ketergantungan antara dua atau lebih variabel bebas (X) dengan variabel terikat (Y) apakah positif atau negatif. Berdasarkan analisis parsial, diketahui bahwa variabel Promosi (X1) dan Pelayanan (X3) berpengaruh positif dan signifikan terhadap Keputusan Nasabah (Y) sedangkan Nilai Taksiran (X2) tidak berpengaruh terhadap Keputusan nasabah.

Keywords
Promosi, Nilai Taksiran, Pelayanan, Keputusan Nasabah

Topic
Manajemen Strategi

Link: https://ifory.id/abstract/tZkyzGhb3JnV

Corresponding Author
Rudy T.M. Situmeang

Institutions
1 Department of Chemistry, University of Lampung, Indonesia
2 Department of Physics, University of Lampung, Indonesia

Abstract
Lanthanum chromite is a material that plays a large role in the development of fuel cells, catalysts, electronic devices, semiconductors and magnetics. The application of this compound is determined by the material characteristics. The LaCr1-xVxO3 compound was prepared using a simultaneously method of sol-gel and freeze-drying from salts of chrome, lanthanum, and vanadium in pectin solution. The characterization results using X-ray diffraction, diffuse-reflectance UV-Vis spectrophotometer, and SEM-EDS showed that the materials formed have the main structure of ABO3 perovskite (such as LaCrO3 and LaVO3) with minor phases of LaCr2O6 and LaVO4 while the band-gap energy of materials due to the addition of vanadium in LaCrO3, it shifts its energy to a lower direction, namely: 2.89; 2.3; 2.4; 2.5 eV for LaCr1-xVxO3 (where x = 0, 0.1, 0.3, and 0.5), respectively. Then, SEM micrographs showed that the distribution of the crystalline phase is fairly even and homogeneous.

Keywords
Perovskite, nanomaterial, band-gap energy, well distribution

Topic
Nano-materials and applications

Link: https://ifory.id/abstract/8Gh9zZtw23Xm

Corresponding Author
Fatimah Arofiati Noor

Institutions
Department of Physics, Physics of Electronic Materials Research Division,
Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,
Jalan Ganesa 10, Bandung 40132, Indonesia
*Email: fatimah[at]fi.itb.ac.id

Abstract
In this study, the spin-polarized currents in a magnetic tunnel junction (MTJ) with a Fe/GaAs/Fe structure were calculated by considering the Dresselhaus effect. First, the transmittance was calculated using the Airy wave function approach, where it was found that the electron transmittance for each spin state is different and the incident angle affects electron transmittance and electron polarization. It was further shown that electron polarization is also affected by the electron energy and the barrier width, and that the electron transmittance is quasi-symmetric to the incident angle. The obtained transmittances were subsequently used to calculate the spin-polarized current in the MTJ, where it was found that the current density for both spin states increases with the addition of external voltage. It was also shown that the current density increases as the barrier width decreases. In addition, the temperature and the incident angle of the electrons affect the current density, where the maximum current density is obtained when the electrons come in a direction perpendicular to the barrier. We herein determined analytically that a high device performance of the MTJ could be achieved by simply controlling the device parameters of barrier width, temperature and incident angle of the electron.

Keywords
Dresselhaus term, Magnetic tunnel junction, Spin-polarized current, Transmittance, Zinc blende material

Topic
Optical, luminescence, Electronic Materials and applications

Link: https://ifory.id/abstract/3t2XTu9prC7M

Corresponding Author
Dian Agustia

Institutions
Department of Accountancy
Faculty Economic and Business
Universitas Airlangga

Abstract
This study aims to identify and analyze the influence of environmental management accounting on future performance with innovation as an intervening. Innovation is one strategy to produce a competitive advantage. With the competitive advantage achieved, corporate performance is expected to be increased. However, companies are expected to implement a strategy that not only emphasizes business continuity, but also can carry out its business process with the concept of sustainable development. Using 122 manufacturing companies which are listed in Indonesian Stock Exchange, this study tests the hypotheses using path analysis. The paper provides empirical insights about how environmental management accounting does not affect future performance while innovation can mediate the effect of environmental management accounting on future performance.

Keywords
environmental management accounting, innovation, future performance

Topic
Enviromental Accounting

Link: https://ifory.id/abstract/rVdM79CJKbN4

Corresponding Author
Yani Permatasari

Institutions
Department of Accountancy
Faculty of Economics and Business
Universitas Airlangga

Abstract
Intellectual Capital (IC) in the "knowledge economy" has the ability to create value added that can provide a competitive advantage for a company. This study aims to examine the influence of Intellectual Capital (IC) on the financial performance and market value of 71 companies that made an Initial Public Offering (IPO) in 2011-2015. In this research IC is measured by using Value Added Intellectual Capital (VAICTM) method, and to test the effect on financial performances and market value used Partial Least Square (PLS) for the data analysis. The result of the research shows that (1) IC has positive and significant influence on companys financial performance during IPO, (2) IC has positive influence to market value of company during IPO, but it is not significant, (3) IC has positive and significant influence on companys financial performance in the future, and (4) IC has a positive influence on the market value of company in the future, but it is not significant.

Keywords
Intellectual Capital, Financial Performances, Market Value, Initial Public Offering

Topic
Enviromental Accounting

Link: https://ifory.id/abstract/hR6DKBQXufkt

Corresponding Author
Indrianawati Usman

Institutions
Department of Management
Faculty of Economics and Business
Universitas Airlangga

Abstract
Green operations is a concept with regard to environmental management strategies. The purpose of this research is to explore the empirical green operations activities found in the literature, and to develop a framework for formulating appropriate strategies for hospital green operations especially with regard to the management of medical waste it was reviewed with the concept of green operation of hospital. This research will be conducted with a qualitative explorative approach and case study research. The research case is hospital which start to implement green operation in medical waste management. After providing a background discussion on Green Operations Management, case study research conducted in the hospital medical waste management. The case study analysis conducted according to a specific conceptual model of green operations especially in waste management. The results indicate that The hospital has begun to implement green operations specifically with regard to managing medical waste. The suitability of the hospital program with the Decree of the Indonesian health minister No.1204 of 2004, indicated by the fact that at present the hospital has fulfilled 6 of 9 points for minimizing medical waste. In the sorting section, it has fulfilled 4 of 6 points. The hospital has also fulfilled 3 points in the transportation section. There are 7 points that explain how to process, destroy and dispose of hospital solid waste

Keywords
Hospital waste management; green operations; Medical waste

Topic
Medical Waste Management

Link: https://ifory.id/abstract/X4hc3aYRtxMz

Corresponding Author
Okyviandi Putra Erlangga

Institutions
a) Islamic Economics Master Program, Department of Islamic Economics, Faculty of Economics and Business, Universitas Airlangga, Surabaya, Indonesia
*okyviandi.putra-2017[at]pasca.unair.ac.id
b) Department of Islamic Economics, Faculty of Economics and Business, Universitas Airlangga, Jl. Airlangga 4 Surabaya 60286, Indonesia

Abstract
Indonesian Small and Medium Enterprises (SMEs) are the largest business sector and an important component of the nations economic development. However, limited studies are examined in the development of SMEs, challenges and opportunities for green business in the future. Therefore this article discusses the development of SMEs in Indonesia, challenges and environmentally friendly business opportunities among SMEs that play an important role in the nations growth. The main point of the studies examined in this paper is that Indonesian SMEs contribute to the largest business establishment in Indonesia and most of them are in micro-size establishments. The uniqueness of this paper focuses on the role of Indonesian SMEs and their contribution and strategies for SMEs that can be done towards green SMEs.

Keywords
SMEs, Green SMEs, Challenges, Opportunities

Topic
Environmental Economics

Link: https://ifory.id/abstract/UJF3rHkvLaxc

Corresponding Author
Dwi Anggorowati Rahayu

Institutions
1) Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya, East Java, Indonesia
2) Indonesian Genetic and Biodiversity Community, Jl. Ikan Mujair No 15, Tunjung Sekar, Lowok Waru, Malang
3) Department of Biology, Borneo Tarakan University, North Kalimantan, Indonesia
4) Laboratory of Molecular Biology, Faculty of Healthy Science, Universitas Muhhamadiyah Sidoarjo
5) Department of Biology, Faculty of Mathematics and Natural Sciences, Brawijaya University

Abstract
Masheer is Indonesias endangered local fish. This study conducted to characterize and mapping the phylogenetic relationship of Masheer fish from East Java, West Kalimantan, Padang and North Sumatra using a partial sequence of mtDNA 16S rRNA. PCR amplicons at 542 bp in length. The construction of phylogenetic topology was made based on ML and NJ method using Kimura-2 parameter model. Based on the phylogenetic topology showed that Tor fish from Pasuruan are closely related to Tor duoronensis from Padang with a bootstrap value of 66%, while Tor duoronensis fish from North Sumatra and Tor tambra from West Kalimantan are in separated clusters. Sequence was compared and multiple sequence alignment revealed some polymorphic sites which can be used to differentiate Genus Tor from Indonesia. This 16S rRNA gene finding has a significant contribution to indicate phylogenetic of Masheers fish in Indoensia

Keywords
mitochondrial DNA, 16S rRNA, phylogenetic, genus Tor, polymorphic site

Topic
Bioconservation

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

Corresponding Author
Zainul Hidayah

Institutions
Trunojoyo University of Madura

Abstract
Collisions or harsh shifting plates accompanied by an earthquake in the ocean area would pose a potential tsunami. South Coastal Malang is one of the areas prone to tsunamis. This study aims to determine the vulnerability of the area and the resilience of coastal communities Gedangan subdistrict, Malang against tsunami. The method used in the determination of the class of vulnerabilities is weighted overlay with the four elements, namely elevation, slope, distance from the beach and the distance from the river. In the comprehensive results indicate very low susceptibility 188.63 Ha, 7470.46 Ha low, medium 1026.63 Ha, 649.72 Ha high, and very high 201.38 Ha, with a total area of 9536.84 Ha. The method used in the determination of community resilience using CCR (Coastal Community Resilience). CCR method is a method that is performed to determine communities resilience in the face of disaster by distributing questionnaires and scoring. CCR resistance element is composed of government, social and economic life, coastal resource management, structural design and land use, knowledge of the risks, warning and evacuation, emergency response, and recovery after a disaster. RESULTS resistance element that is below standard (3) is a government elements (2,62), social and economic life (2.66), the design of the structure and land use (2.51) and disaster recovery (2.35). Thus the need for recommendations to improve community resilience element so that in accordance with the standards.

Keywords
vulnerability, tsunami, resilience, coastal community

Topic
Environmental Engineering

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

Corresponding Author
Eko Susetyorini

Institutions
Departement of Biology Education, Universitas Muhammadiyah Malang, Jl. Raya Tlogomas No. 246 Malang, East Java, Indonesia (62341) 551149

Abstract
Based on the substances it contains, kaffir lime leaves (Citrus hystrix DC) are indicated to have efficacy in increasing female reproductive fertility. The purpose of this study was to examine the effect of kaffir lime leaf extract on the number of ovarian follicles of female white rats (Rattus norvegicus). This true-experimental research used three levels of extract concentration, i.e. 250 mg / kg, 500 mg / kg, and 750 mg / kg. Data from the study were analyzed using one-way ANOVA and continued with DMRT test. As a result, the administration of kaffir lime leaf extract had a significant effect on ovarian follicles number in white rats (p < 0.001). Treatment with a dose of 500 mg/kg and 750mg/kg did not have a significant difference in the number of primary, tertiary and de graff follicles, while the secondary follicles in the treatment of 750 mg/kg had a significantly higher number of other treatments. Therefore, kaffir lime leaf extract has the potential as herbal medicine for womens reproductive health.

Keywords
Citrus hystrix, female fertility, ovarian follicle

Topic
Biomedical Science

Link: https://ifory.id/abstract/RgWBhC9zmxwc

Corresponding Author
Indah Fajarini

Institutions
Universitas Negeri Semarang, Indonesia
Edith Cowan University, Australia

Abstract
The objective of this paper is to examine the relationship between company financial performance, company characteristics and non-financial performance disclosure (NFPD) in terms of quantity and quality. This paper uses a NFPD index that covers six perspectives: three perspectives of the Balanced Scorecard (BSC) and three perspectives of Environmental, Social and Governance (ESG) disclosure. The sample data used in this study is 30 Australian listed companies in 2014. The results show that in terms of quantity, there is a significant relationship between company financial performance (Return on Equity-ROE and Earning per Share-EPS), company type, company age, auditing firm and non-financial performance disclosure while Return on Asset (ROA) and size of company shown no significance. Meanwhile, in terms of quality, only ROE and company age were significantly related to non-financial performance disclosure. Overall, by using the six perspectives of non-financial performance disclosure in the 30 companies in Australia, this study has contributed new understandings to the main corporate social disclosure studies focused on non-financial performance disclosure, which should motivate companies to produce and disclose annual and sustainability reports that are more comprehensive and highly credible.

Keywords
Non-financial performance disclosure; Balanced Scorecard; Environmental, Social and Governance

Topic
Accounting

Link: https://ifory.id/abstract/hCdDb6TnAEyG

Corresponding Author
Asep Sufyan Muhakik Atamtajani

Institutions
Product Design, Telkom University

Abstract
Excessive consumption due to population density causes the amount of waste to increase, for example, the city of Bandung. Bandung is a tourist city that provides a lot of typical ole and typical food too. Like beat noodles. Mie kocok is a food made from noodles and uses beef broth. Beef broth is obtained using decoction of beef bone as the main ingredient. Mi shake results in cow bone waste. The beef bone that becomes this waste is quite disturbing. In this report the use of cow bone waste is the main material for making accessories products. To get a good result of processed beef bone material, several studies were carried out, such as conducting observations, case studies, and interviews with business owners of cow bone craftsmanship. The method used for processing was obtained from several experiments. Processed cow bone material that is clean and odorless which can be made as the main ingredient in making accessories.

Keywords
Waste, Ox Bone, Material, Accessories

Topic
Design

Link: https://ifory.id/abstract/eZCkJx98htqK

Corresponding Author
imtihan hanom

Institutions
Telkom University

Abstract
This study departs from the phenomenon of increasing crime that occurred at the Automatic Teller Machine (ATM). The rise of crime at ATMs does not only occur in Indonesia, but almost all over the world. Crimes at ATMs have occurred from the very beginning the ATM was introduced to the public, until now. Crimes that occur at ATMs are mostly in the form of robberies which sometimes lead to murder. This study looks for interior variables that can increase the sense of security of ATM machine room users so as to suppress the intentions of criminals to act in them. Interior variables are obtained from several theories related to the prevention of criminal acts at ATMs, human safety perception and recommendations related to the prevention of existing crime. The results obtained from a number of recommendations related to crime prevention and theories related to the perception of safe humans that produce two main interior variables, namely; visual oppenes and territoriality. The design of an ATM room using these two main variables is expected to be able to provide a sense of human security when they want to visit and / or are in an ATM room. The results of the study are expected to provide an overview of the form of ATM space that can increase the users sense of security so that it can reduce the occurrence of criminal acts. This research is also expected to be an ATM room design standard to suit human basic needs, one of which is security

Keywords
secure perception, crime prevention, interior design

Topic
Design

Link: https://ifory.id/abstract/V2Kt7qfcPYuX

Corresponding Author
Nihta Vera Frelly Liando

Institutions
Universitas Negeri Manado

Abstract
The research study reported in this article aims at explaining the application of digital media in improving students- writing ability in writing a report text. This research was conducted at one of the high schools in the regent of Sangihe. Ninth grade students consisting of 30 students were involved in this study. Classroom action research (CAR) was employed to collect data. The research was done in two cycles applying four steps in each cycle: planning, observing, acting and reflecting. The data were collected through observation check list and test. The result of each cycle showed that students writing ability was found increased. Mean average in Cycle 1 was 76.73, whereas in Cycle 2 was 81.06. This result led to a conclusion that digital media is considered effective in improving students- writing ability of a report text. Thus, it is recommended that digital media could be used to teach students writing report text.

Keywords
digital media, writing, recount text, classroom action research (CAR)

Topic
Other Areas of Education

Link: https://ifory.id/abstract/fcNPAW7Hkpyw

Corresponding Author
Treesje Londa

Institutions
Universitas Negeri Manado

Abstract
Learning Environment by using the Inquiry method can bring students into problems directly, so they can develop capabilities in terms of solving environmental problems that will be faced. In addition, the Inquiry method will train students to communicate well between fellow students and teachers (lecturers). This research is intended to describe the presence or absence of a treatment given to the subject of the studyThe application of inquiry methods is effective in increasing students competency of the environment and would be skilled in solving problems. By investigations conducted at Tondano Lake, students will be able to prove the truth of a theory by themselves. This type of research is an experiment using descriptive quantitative data analysis techniques by one group pretest-posttest design. Based on the results of the research and discussion, it was concluded that environmental learning using the inqury method at Tondano Lake had a significant effect on students competency. This is evidenced by the average gain score reaching 92.4769 or 94.5% and the implementation of learning which is in the effective category.

Keywords
Learning, Environment, Inquiry Method, Tondano Lake

Topic
Learning / Teaching Methodologies and Assessment

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

Corresponding Author
Felly Ferol Warouw

Institutions
Universitas Negeri Manado

Abstract
This research is to analyze the implementation of the waste bank policies in Manado City. The method used is descriptive by discussing qualitatively and approved by three research focuses, namely first collecting waste management programs in Manado city, secondly analyzing community participation in waste bank development programs and studying the factors that become obstacles and supporters in developing waste banks in Manado City . The first research results related to waste management programs containing various programs. For waste banks, it is one of the alternative solutions to waste problems in the city of Manado. Both developing community participation are still in consultation not yet in community control. Community participation consists of sorting household waste containing organic inorganic waste. The third is a supporting factor in the development of waste banks in the city of Manado, namely the role of local government as well as state-owned private companies as supporters of the implementation of the waste bank program. As for inhibiting factors such as low society, the development of waste banks requires high investment, low value of waste, and the culture of manado who pay attention to waste as a dirty thing.

Keywords
Analysis, Implementation, Waste Bank, Manado City

Topic
Other Areas of Education

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

Corresponding Author
Afiifah Aris Putri

Institutions
Department of Agro-industrial Technology, Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Abstract
Black rice is anthocyanin-containing rice. Black rice farming can be found in several parts of Indonesia, including in Yogyakarta where the harvest is mainly used for self-consumption and to be marketed. In 2018, almost half of the farmers facing the problem to market the harvest. On the other hand, black rice distributors expressed their needs of more supply to meet Yogyakarta market demand. Therefore, it is necessary to do research on modeling the black rice marketing channel system to observe the behaviour of black rice inventory. This study aims to produce a black rice marketing system model and find out the black rice inventory system in Yogyakarta using a dynamic modeling. The sampling techniques used purposive and snowball sampling in the black rice marketing channels. The results show that the system consisted of farmers, collectors, distributors, retailers and consumers subsystems, and the best scenario in the simulation implied the collectors and distributors must increase the sale to other areas outside Yogyakarta.

Keywords
black rice; dynamic modeling; inventory

Topic
Postharvest and food engineering

Link: https://ifory.id/abstract/HzQC7k6ajwYc

Corresponding Author
Yanis Rahmasari Putri

Institutions
Department of Agroindustrial Technology, Universitas Gadjah Mada
Jalan Flora No. 1, Yogyakarta, Indonesia
*yanisrp[at]mail.ugm.ac.id

Abstract
This study aims to determine the factors that influence consumer perceptions of local black rice in Special Region of Yogyakarta (Yogyakarta) and consumer willingness to pay (WTP). Consumer perceptions and WTP need to be known in order to expand marketing and preserve the sustainability of local black rice in Yogyakarta, and can be input for producers in developing marketing strategies. Data collection used purposive and snowball sampling techniques with questionnaires and interviews with black rice consumers in Yogyakarta, namely Sleman, Bantul, and Gunungkidul Regency. The method used was descriptive analysis, factor analysis, and Contingent Valuation Method (CVM). The results showed that the majority of black rice consumers in this research were women (64%) with ages between 18-27 years. The factors that influenced consumer perceptions of black rice were quality attribute factor with an eigenvalue value of 9,365, purchasing location factor (2,980), socialization of the benefits of black rice to consumers factor (1,885), product superiority compared to white rice factor (1,502), price according to benefits factor (1,103), and packaging factor (1,065). The average price of black rice is 264% of the white rice price.

Keywords
Black rice; Consumer perception; Willingness to pay

Topic
Other Agricultural and biosystems topic

Link: https://ifory.id/abstract/6wUqtNeL2ydY

Corresponding Author
Subandiyah Azis

Institutions
National Institute of Technology Malang, East Java, Indonesia

Abstract
In order to maintain food security in Indonesia it is very necessary to organize the provision of irrigation water. Current surface water discharge conditions have decreased compared to 10 years ago so that there really must be efficient and wise efforts in the provision of irrigation water in paddy fields. Many efforts to increase the productivity of paddy fields and one of them is to optimize paddy fields area and reset cropping patterns in the paddy fields. In the initial stage of this study an analysis of the availability of surface water discharge was then analyzed for irrigation water requirements that could be given to each paddy field in accordance with a predetermined cropping pattern. Then a land area simulation is carried out to obtain the most optimal land area. This simulation is carried out in the conditions of the wet season, the normal season and the dry season. Simulations are carried out with various cropping patterns including rice and secondary crops. Simulation results show that the largest area that produce maximum production in the wet season is 11285 ha, in the normal season is 9436.22 ha and in the dry season is 5944.87 ha.

Keywords
irrigation water, wet season, normal season, dry season.

Topic
Civil Engineering

Link: https://ifory.id/abstract/j2tNbABa8wcd

Corresponding Author
Mohammad Yanuar Hariyawan

Institutions
Politeknik Caltex Riau

Abstract
Light emitting diode (LED) lamps are become popular in a wide range of applications, due to low power, high efficiency, and low maintenance. To achieve high efficiency in energy transfer in the LED driver, a switched-mode power supply (SMPS) topology is applied. SMPS operates at a constant frequency; it generates significant emission in some of the frequencies through conducted and radiated mechanisms. Several solutions are proposed to mitigate the EMI (electromagnetic interference), such as converter design, component selection, EMI filtering, and spread spectrum techniques. Spread spectrum is a cheap and efficient solution in the conducted emission mitigation. This research performs the conducted emission mitigation is done by modifying the switching on the LED Driver using chaotic signals. The Lorenz equation is selected to produce chaotic signals. The effect of EMI caused by the chaotic signal is analyzed toward the performance of the system, compared with performance when it is modulated by periodic signals. Lorenzs injection signals have reduced distribution over a larger frequency range compared to other injection signals. The average EMI reduction produced by Lorenz signal is the highest compared with other modulated signals of 10.63 dB.

Keywords
SMPS, EMI, conducted emission, chaotic, lorenz

Topic
Telecommunication Engineering

Link: https://ifory.id/abstract/cY6nW7GNqjvg

Corresponding Author
A. Naashir M. Tuah Lubis

Institutions
1) IAIN Padangsidempuan, Sumatera Utara, Indonesia
2) Mathematics Education Program, Universitas Bengkulu, Indonesia

Abstract
Problem-solving is one of the goals of mathematics learning. Ethnomatemics-based realistic mathematics learning is learning with starting-point contextual problems that are close to students minds. This study aims to determine the effect of ethnomathematics-oriented realistic mathematics learning on problem-solving abilities. That is a type of quasi-experimental research. The study design was a nonequivalent control group. The population is SMA N 2 Kota Bengkulu in 2019. The sample of this study was 68 students from Class X MIPA A and X MIPA D. The research instrument was a test of problem-solving skills. Data were collected through tests and analyzed by covariate analysis. The results of this study are that realistic mathematics learning oriented to ethnomathematics has a positive effect on the ability to solve. The conclusion is that realistic mathematics learning with ethnomathematics orientation can improve mathematical problem-solving skills for secondary school students. We suggest that mathematics teachers can develop realistic mathematics learning tools with ethnomathematics as a starting point for learning.

Keywords
Realistic Mathematic Education, Ethnomathematics, Problem Solving Ability

Topic
Mathematics Education

Link: https://ifory.id/abstract/ADJz3NcdGEVf

Corresponding Author
Agus Hermawan

Institutions
Universitas Negeri Malang

Abstract
Purpose - The purpose of this study is to uncover conditions, dilemmas, and efforts to solve halal food products in relation to consumer protection efforts in Indonesia. Design/methodology/ approach - The study uses secondary data with a conceptual approach with a study of social theory and facts in Indonesia. Findings - The results of the study show that the role of employers, government and consumer protection institutions still needs to be improved to promote consumer rights and obligations regarding halal products. Socialization to the public is still felt lacking and ongoing socialization efforts to bring intensive awareness are still needed to increase trust in halal food products. Research limitations/implications - The limitations of existing empirical data regarding the behavior of consumers using halal products are the main things that further research is still needed. Practical implications - Consumer awareness of halal products still needs to be encouraged so that consumers are aware of their rights and obligations and are protected from producers who are misconducted. This can be done through mass media massively campaign. Originality/value - Synchronization between related institutions is the key to winning the consumer while still opening opportunities for entrepreneurs to honestly provide product information. Government policy in favor of protecting consumers with law enforcement is a picture given in this paper to foster more comprehensive literature in the field of consumer protection of halal products.

Keywords
Halal food product, Consumers protection, government policy

Topic
Halal Food, Pharmaceutical, and Cosmetics Manufacturing

Link: https://ifory.id/abstract/yVP3hKjuBnwr

Corresponding Author
Amini Amir Abdullah

Institutions
Fakulti Ekologi Manusia, Universiti Putra Malaysia.

Abstract
This paper discussess about 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
Islamic banking, Malaysia, Muslim Halal Entrepreneurs, business financing

Topic
Islamic Banking, Finance, Insurance, and Sharia Accounting

Link: https://ifory.id/abstract/HbyXDM94YkUn

Corresponding Author
Moch Syaiful Anwar

Institutions
1Research Center for Metallurgy and Materials, Indonesian Institute of Sciences, Kawasan PUSPIPTEK Gedung 470 Tangerang Selatan 15314, Indonesia
2Fakultas Teknik, Universitas Sultan Ageng Tirtayasa, Indonesia

Abstract
This paper reports effect of heat treatment process on hardness and hot corrosion resistance of Fe-25Ni-18Cr-1Mo-2W-1Nb-cast austenite stainless steel. The steels sample were prepared by a process sequence of induction melting, hot rolled, solution treatment and aging. After heat treatment process, the steel is subject to light optical microscope, hardness microvickers test and hot corrosion of melting salt test. Scanning Electron Microscope (SEM), Energy Dispersive Spectrometry (EDS) and mapping of element was carried out to analysis of corrosion layer on its surface. Results show that higher hardness value was found in solution treatment of 975°C and aging for 16 h whereas higher hot corrosion resistance was found in solution treatment of 1025°C and aging 16 h.

Keywords
heat treatment, hardness, microvickers,hot corrosion, melting salt, Fe-25Ni-18Cr-2W-1Nb-cast, austenite stainless steel.

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/7gwXa9NG3ZuP

Corresponding Author
Retti Hanggia Anggela

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 application of SnO2 nanoparticles has been carried out in various fields, one of which is as photoelectrode on dye sensitized solar cells (DSSCs) due to their high electron mobility. In general the efficiency of DSSCs is absolutely dependent on the morphology of SnO2. Morphology in the form of aggregates could reduce the efficiency of DSSCs SnO2 nanoparticle based. The synthesis method to reduce the aggregate formation has been widely developed, one of which is green hydrothermal synthesis by the addition of capping agents. In this study, fructose was used as a capping agent in the synthesis of SnO2 nanoparticles using the hydrothermal method with a temperature variation of 120, 150 and 180 ⁰C which aims to reduce aggregate formation. The effect of adding fructose at different temperatures on the purity and morphology of SnO2 as synthesized was characterized using X-Ray Diffractometer (XRD) and Scanning Electron Microscope (SEM). The obtained XRD pattern clearly shows that all products produce high purity of SnO2 nanocrystal phases, it was proven by the absence of impurity peaks. In addition, SEM images show that the addition of fructose could reduce the aggregate form of SnO2 nanoparticles. These results indicate that the addition of fructose in the reaction solution can be an alternative method for controlling the morphology of SnO2 nanoparticles and is expected to improve the efficiency of DSSCs.

Keywords
Nanoparticle, SnO2, Capping agent, Fructose

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/X3bn96TjfkAG

Corresponding Author
Ahmad Rifqi Muchtar

Institutions
1,3. Electrical Engineering, State Polytechnic of Jakarta, Depok, Indonesia
2. Department of Engineering Physics, Faculty of Industrial Technology, Institut Teknologi Bandung, Indonesia
4,5. Civil Engineering, State Polytechnic of Jakarta, Depok, Indonesia

Abstract
Metal Oxide Semiconductor (MOS) material is chosen as a gas sensor because of its nature which can be modified as needed. In this research SnO2 is choosen becoause of its chemical and physical stability compared to the other MOS. However for gas sensor application, SnO2 have drawbacks of low selectivity and high operating temperature. To overcome those drawbacks, the SnO2 is mixed with graphene by molar ratio 1:1, and synthesized with polyol method using ethylene glycol as solvent, at 197 oC for 12 hours. The resulting material is then settled, and calcined at 550 oC. The characterization used are SEM, TEM, EDS, UV-Vis spectrophotometers, and gas sensor performance test with CO gas. The particle size are in range of 5-15 nm. The band gap test result of SnO2-graphene is 2,94 eV which decrease 0,62 from SnO2 band gap. The detection of 20 ppm CO gas for 10 minutes result in highest sensivity of 59% at 300 oC.

Keywords
Semiconductor, SnO2, Graphene, Polyol, UV-Vis

Topic
Functional Materials

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

Corresponding Author
Maya Puspitasari Izaak

Institutions
(a) Dept. of Physics Education, University of Pelita Harapan Karawaci, Tangerang 15811, Indonesia
*maya.izaak[at]uph.edu
(b)Center for Science and Technology of Advanced Materials, BATAN, Tangerang Selatan 15314, Indonesia

Abstract
The optimal decomposition of ilmenite to obtain an increase in TiO2 levels has been successfully carried out through a multi-step hydrometallurgical process. The initial levels of ilmenite in the iron sand was obtained about 46.50%. The multi-step hydrometallurgical process was carried out in order to determine the efficiency of TiO2 extraction. The sediment, which is obtained by this process was characterized using XRD and SEM-EDS. The result of XRD analysis was obtained the percentage of TiO2 formed in the leaching stage 1 and 2, respectively 85.01% and 95.55%. Based on the result of SEM-EDS analysis, the morphological was heterogeneous with particle size about 180-300 nm. It was concluded, that a multi-step hydrometallurgical process can increase TiO2 levels quite high and the process efficiency was very good

Keywords
Ilmenite, hydrometallurgy, TiO2, increasing levels

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/M2WfjTDxAZ9k

Corresponding Author
Kurniati Abidin

Institutions
Department of Physics
Physics of Electronic Material Division
PECVD Lab
Institut Teknologi Bandung
Jl. Ganesha 10, Bandung 40132, West Java. Indonesia
*email: toto[at]fi.itb.ac.id

Abstract
Silver (Ag) nano catalyst has been deposited on SiO2 glass substrate by thermal evaporation method. The layer thickness was about 2.42 nm. The Ag nano catalyst was then annealed at temperature of 4000C with variation of annealing time of 1, 2, 3 and 4 hours. SEM, EDS and FTIR spectroscopy were used to characterize the samples. From the Scanning Electron Microscope (SEM) images showed that diameter size of the nanoparticles were mostly 2.92, 1.69, 0.69 and 0.89 mm, respectively. Energy Dispersive X-Ray (EDX) Spectroscopy revealed that composition of Ag for each sample are 0.26, 0.14, 0.48 and 0.14% respectively. Based on the SEM and EDX results, the smallest diameter of particles and the most Ag composition was obtained after annealing for 3 hours. Fourier transform infrared (FTIR) spectroscopy indicate that the Ag nano catalyst were formed by Si-O-Ag bonds at 1379 cm-1.

Keywords
Nano catalyst, Silver, thermal evaporation, Annealing

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/W3EbwjrHcdQf

Corresponding Author
Dwi Cahyono

Institutions
a) Department of Business Management, Sepuluh Nopember Institute of Technology, Indonesia
*dweec[at]yahoo.com
b)Department of Information System, Sepuluh Nopember Institute of Technology, Indonesia

Abstract
Management Information System (MIS) in government institutions was a very crucial thing. The established MIS often provided less optimum benefits since the MIS development did not go through a good planning and clear IT masterplan. The procurement unit of Malang City has a MIS (SiBaja) which has been established since 2016 and since then suitability evaluation has never been performed. This study aimed to evaluate the suitability of SiBaja to the needs of users and management using Human, Organization, Technology-Fit (HOT-Fit) framework.To obtain the data, a survey method was used by distributing questionnaires to the application users.The data analysis model used was SEM-PLS by using SmartPLS 3.0 software. This study found that the implementation of SiBaja was not fully fit for the relationship between Human-Technology that was indicated by the absence of a significant effect between User Satisfaction (US) variable and System Quality (SQ) variable with a significance value of 0.899 at alpha = 0.05. and was not fully fit for the relationship between Organization-Technology factor which was characterized by the absence of a significant effect between Service Control (SC) variable and Information Quality (IQ) variable with a significance value of 0.221 at alpha = 0.05.

Keywords
Management Information System, Suitability Evaluation, HOT-Fit, SEM

Topic
Management Strategic

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