Indonesia Conference Directory

Corresponding Author
Wira Eka Putra

Institutions
1Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang
2Division of Genetic and Molecular Biology, Yayasan Generasi Biologi Indonesia (Genbinesia)
3 Department of Biology, Faculty of Mathematics and Natural Sciences, Brawijaya University

*Corresponding Email: hendrabio[at]um.ac.id

Abstract
Recent trend in health care demonstrates the significant use of herbal as preventive or therapeutic strategy against multiple type of diseases including respiratory disorder. Thus, in this present study we aims to explore the potential of black tea phytochemical compounds as inhibitor against human α-3 nicotinic acetylcholine receptors. The 2D structure of black tea compounds were retrived online from PubChem data base. On the other hand, the 3D protein structure of human α-3 nicotinic acetylcholine receptors (NAchR) was obtained from protein data base. Protein-ligand preparation were proceed to optimize the molecular interaction results. The final step of this screening is performed data visualization and analysis. In this study, we found that there are three potential compounds that might be act as inhibitor for α-3-NAchR considering of its energy free binding. Thus, this results indicate that the black tea bioactive compounds might be potential to develop as inhibitory agents for α-3-NAchR to minimize the negative effect of nicotine.

Keywords
α-3 nicotinic acetylcholine receptors, black tea, nicotine

Topic
Bioinformatics

Link: https://ifory.id/abstract/gxRKjavJPWk7

Corresponding Author
Muhammad Rifqi Hariri

Institutions
1Research Center for Plant Conservation and Botanic Gardens, Indonesian Institute of Sciences, Jl. Ir. H. Djuanda No. 13, Bogor
2Indonesian Genetic and Biodiversity Community, Jl. Ikan Mujair No. 15, Tunjung Sekar, Lowok Waru, Malang
*muhammadrifqihariri[at]gmail.com
3Herbarium Bandungense (FIPIA), Sekolah Ilmu dan Teknologi Hayati (SITH), Institut Teknologi Bandung, Gd. Labtek VC, Jl. Let. Jen. Purn. Dr (HC) Mashudi No. 1, Sumedang
4Sekolah Ilmu dan Teknologi Hayati (SITH), Institut Teknologi Bandung, Gd. Labtek XI, Jl. Ganeca No. 10, Bandung

Abstract
Ficus spp. (Moraceae) belong to the tribe Ficeae in Moraceae family. Many members of this genus has been collected in Bogor Botanic Gardens. A total of 519 living collections of Ficus spp. has been conserved since 1817 and there are about 13 species have not been identified yet. This research aims to identify of Ficus sp. using morphological and molecular approach. Morphological characterization and herbarium specimen observation has been carried out to identify Ficus sp. originating from Sumatra. The molecular approach is carried out using ITS (internal transcribed spacer) marker. The result of morphological and molecular analysis will be explained in this paper.

Keywords
Bogor Botanic Gardens; Ficus; ITS; living collection; Sumatra

Topic
Botany

Link: https://ifory.id/abstract/XVKRyvw4mJkN

Corresponding Author
Asep Sumantri

Institutions
Universitas Sultan Ageng Tirtayasa

Abstract
Tangkue, one of rambutan (Nephelium lappaceum L) variety originated form Banten Province found to be mycotrophic. The aim of this study was to investigate the association of Arbuscular Mycorrhizal Fungi (AMF) and diversity in Rambutan Tangkue (Nephelium lappaceum L.) in Lebak Cilayang, Banten. This research was conducted from July 2018 to January 2019. The rambutan soil rhizosphere and roots were sampled from two stations and the AMF spores were trapping and extracted by Wet sieves and decantation techniques The results showed that the spore density Spore density varies between 2012-372/100g of soil. About four genera has been successfully isolated: Glomus, Acaulospora, Gigaspora and Scutellospora. Glomus is the most dominant genus in the Rambutan Tangkue rhizosphere.

Keywords
Rambutan tangkue, Arbuscular Mycorrhizal Fungi, diversity

Topic
Microbiology

Link: https://ifory.id/abstract/cjruBKxk3qFA

Corresponding Author
Mulyo Agung

Institutions
Pandu Madania, Economics High School

Abstract
Accountability is an important issue in Indonesian government. The present study aims to further analyze performance accountability issue in regional governments in Indonesia, which is affected by the quality of financial reports. The fact shows that regional governments in Indonesia have low performance accountability. This study attempts to attest for or against the statement through testing whether or not financial reporting quality has an effect on regional governments- performance accountability. Subjects of the study are 40 Satuan Kerja Perangkat Daerah (SKPD/Regional Government-s Work Units) of Regencies/Cities in Indonesia. Survey is the research methodology implemented. Hypothesis is analyzed and tested using Structural Equation Model (SEM). The findings show that good Financial Reporting Quality will improve Performance Accountability of regional governments in Indonesia, with positive path coefficient.

Keywords
Financial Reporting Quality, Regional Government-s Performance Accountability

Topic
Accounting

Link: https://ifory.id/abstract/tpxXuz7avmKF

Corresponding Author
Mauluddin M. Noor

Institutions
post graduated university of medan

Abstract
This research is the implementation research of Curriculum 2013 Senior Vocational High School (SMK) in Batubara Regency found many obstacles at the beginning of its application. This study aims to evaluate the implementation of Curriculum 2013 in Batubara District of the academic year 2017/2018. The components of the evaluated curriculum implementation include. The condition of the student, the condition of the teacher, the teachers understanding of the curriculum, the condition of the infrastructure, the instructional planning, the implementation of the scientific. The implementation of authentic assessment, and the results of authentic assessment related aspects of attitude, knowledge, and skills. The evaluation model used is the evaluation model of Stake Countenance Models. Evaluation is done by collecting information in the form of data component of the curriculum implementation to then be compared with the standards of the ministry. The population consists of 22 Senior Vocational High School (SMK). Subject of research is principal and teacher determined by purposive sampling technique. The instruments used are questionnaires, observation sheets, and documentation sheets. Trial of questionnaire instrument was conducted at school in Batubara district. Data analysis using descriptive technique. Research result, student condition of 93.4%, teachers condition of 75%, infrastructure condition of 69.3%, understanding to curriculum 2013 of 80%, learning planning or RPP of 75%. The proposed recommendations are: Student condition: active and creative teachers.Teacher condition: Increased academic qualifications in cooperation with related parties. Teachers must be orderly administration and conduct learning in accordance with the standards of learning implementation.

Keywords
Evaluation, Curriculum Implementation, Curriculum 2013

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/u7JnkPNLcExA

Corresponding Author
WAHYO WAHYO

Institutions
UNIVERCITY OF MEDAN

Abstract
This research was conducted in junior high schools (SMP) in Deli Serdang Regency, North Sumatra Province. This research has been conducted for 2 months, namely October to November 2018. The population in this study were all physical education teachers who taught in the SMP throughout Deli Serdang District. The sample in this study were 12 physical education teachers who would be sampled to distribute the questionnaire. While the respondent representatives for the interview took 3 physical education teachers, 3 school principals, and 1 supervisor. This research is a mix methods research, which is a research step by combining two forms of approaches in research, namely qualitative and quantitative. The conclusions in this study are that classically the results of the percentage of teachers who were certified were 84.44% which was in the Very Good category. Based on data, the overall percentage for teachers who have not been certified 75.97% means that the performance of teachers who have not been certified is good.

Keywords
difference, teachers performance, certified, education

Topic
Education and Research Global Issue

Link: https://ifory.id/abstract/9xWekgcT7ZpH

Corresponding Author
WAN YUSOFF WAN SHAHARUDDIN

Institutions
a) Centre for Language Studies and Generic Development, Universiti Malaysia Kelantan,
Locked Bag No. 01,
16300 Bachok, Kelantan, Malaysia
*yusoff.ws[at]umk.edu.my

b) Faculty of Applied Communication,
Multimedia University, Persiaran Multimedia, 63100 Cyberjaya, Selangor, Malaysia

c) Centre for Language Studies and Generic Development, Universiti Malaysia Kelantan,
Locked Bag No. 01,
16300 Bachok, Kelantan, Malaysia

Abstract
In the face of the public, having certain types of influence is perceived to may help practitioners and even ordinary employees to draw the people-s attention into believing the news or story which spreads to serve any particular purpose. However, it is believed that previous researchers are yet to develop a set of items that can help to interpret the role of influence and power dimension among employees. This study aims to identify the key factors that can help to affirm the suitability of a set of items namely Influence Resources Scale (IRS). A total of 187 respondents consisting of school teachers in Kelantan had voluntarily participated in providing feedbacks towards the Influence Resources Scale (IRS). The completed questionnaires were analysed in the exploratory factor analysis procedure to identify the role of influence and power dimension among employees. A principal component analysis procedure along with the varimax rotation was conducted. The factors generated from the procedure are: Relational: Internal, Informational: Access to Information, Individual: Skills and Individual: Professional. The study concludes that the four –factors derived from principal component analysis with varimax rotation can help to assess the role of Influence Resources among Teachers in Kelantan, Malaysia. The study also suggests that the IRS scale can be replicated to other local and Asian respondents as a predicting factor towards additional variables such as gossip engagement and individual work performance.

Keywords
Exploratory Factor Analysis, influence, influence resources, teachers, Kelantan

Topic
Halal Business Management, Marketing, and Communication

Link: https://ifory.id/abstract/xjYPU64fkWgr

Corresponding Author
Achmad Murdiono

Institutions
Department of Management, Faculty of Economic, Universitas Negeri Malang

Abstract
Indonesia with a Muslim population reaching 87.17% is very strategic for industrial halal development. But halal industries in Indonesia have not grown optimally. One reason is the lack of Islamic finance for halal industry players currently supporting Islamic finance based on Islamic banking. This study aims to increase Islamic finance financing through a SEISHI application (Smart Education and Investment System 4.0 for Halal Industries). SEISHI (Smart Education and Investment System 4.0 for Halal Industries) is a concept of innovation in the field of technology that can be a funding and investment alternative for halal insudtri in Indonesia. This research was designed on a regional scale in Malang City. The research methodology used is descriptive qualitative method. Based on the results of the study, it was explained that the SEISHI application contained two main menus, namely investment for investors and the submission of capital loans. SEISHI (Smart Education and Investment System 4.0 for Halal Industries) brings together important elements in the halal cycle of industry namely halal industry players, Islamic banking, investors and the government as regulators. Through this innovation concept, it is expected that it will be able to strengthen sharia funding and investment for industrial halal actors in a sustainable manner.

Keywords
SEISHI, Islamic finance, Islamic Investment, Halal Industry.

Topic
Sharia Capital Market and Financial Technology

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

Corresponding Author
Suryo Hadi Wira Prabowo

Institutions
Universitas Negeri Malang
Universiti Putera Malaysia

Abstract
This research based of the problem of the number of scientific publications in Indonesia that are still low. The lack of researchers is presumed to be one of the reasons that the number of international publications is still low if compared with other countries. In addition to the above, another problem is that the number of scientific documents in Indonesia is still low in the Southeast Asian region. The above problems are caused by many factors, including (1). Researchers often experience difficulties in obtaining references to both books and journals that support their research, (2). Researchers find it difficult to find research partners who have scientific similarities and interests in one research topic. The purpose of this study is to answer the above problems through an application called thinkgather.com. The purpose of this study was to design and build an application as an interactive medium for researchers. One of the advantages of this application is being able to connect between one researcher and another researcher in one social media. This research was designed to have 3 stages of research, namely the preliminary study and data collection stage, the planning and preparation stage, the limited scale trial stage, the large-scale trial and improvement. It is expected that the thinkgather.com application can become a means of researchers as a media discussion and facilitate researchers in finding partners in the research that will be carried out.

Keywords
Application, Thinkgather.com, Researcher, Social Media

Topic
Halal Science and Technology

Link: https://ifory.id/abstract/nkC9H27MpxEr

Corresponding Author
Nurdeng Deuraseh

Institutions
Director of Halalan Thayyiban Research Centre
Universiti Islam Sultan Sharif Ali (UNISSA)

Abstract
Halal food industry received massive attention by local authorities which make them to push a relevant authority and stakeholder to design and develop halal food standards to cater the growing demand of consumers to halal food industry to produce halal food with safety and quality as requested by the Quran: Kulu Mimma fi al-Ard Halalan Thayyiban: Eat of what on the earth halal-wholesome foods. Based on this demand, Negara Brunei Darussalam, through the Religious Council, develops a Halal food standard PBD24: 2007. This paper is an attempt to discuss, highlight and analyze the general guideline, rule and policy of halal food based on Halal food standard PBD24: 2007 towards global food quality and safety. It was found that Negara Brunei Darussalam owns a comprehensive standard and law to fulfil the need of local and international halal food industry.

Keywords
Halal Food Standard, Quality and Safety Food, Negara Brunei Darussalam.

Topic
Halal Food, Pharmaceutical, and Cosmetics Manufacturing

Link: https://ifory.id/abstract/RDLxGK9CXp4W

Corresponding Author
Raihana Mohd Raffi

Institutions
Halalan Thayyiban Research Centre, Universiti Islam Sultan Sharif Ali

Abstract
Halal has evolved tremendously in the recent years. Previously, there is no demand on halal market. Halal is only targeted for Muslim consumer throughout the world. The practice has been there traditionally. However, halal has been the centre of economic discussion in recent years. This is due to the growth of Muslim population around the world which in turn contributes to the global market demand on halal based on the Global Economic Report. Many Muslim countries take this economic opportunity to grow their halal market, Brunei Darussalam is not an exception. At present, halal industry in Brunei Darussalam is seen as one of the industries that have major potential on local economy due to the growth of the demand globally. Brunei has its own potential to go global despite being geographically small. There are few different entities monitoring halal and playing different roles in Brunei. Brunei Islamic Religious Council (MUIB), Halal Food Control Division, Ministry of Health, Royal Customs and Excise Department. Thus this paper is aimed to give the general insight and overview of halal industry in Brunei Darussalam.

Keywords
Brunei Darussalam, Halal, Halal industry,

Topic
Halal Lifestyle, Fashion, Travel and Tourism

Link: https://ifory.id/abstract/ZjPrwFyL4xGg

Corresponding Author
Suparti

Institutions
Universitas Negeri Malang

Abstract
Only about 10% of all small business in Indonesia have been halal certified. This study aims to understand the factors that can push their intention to conduct halal certification. Of the 30 respondents who have not had a halal certificate yet, this study found that halal awareness, halal knowledge, and challenges do not affect intention. The business actors have already known the existence and procedure of halal certification, but the awareness and knowledge do not guarantee business to conduct halal certification directly. Challenges also do not become a barrier of halal certification. Meanwhile, acceptance of halal certification and motivation from both internal and external encourage the intention of halal certification. Acceptance, desire to have standardized production, encouragement from government, and consumer expectations of halal products drive the intention of halal certification. The implication of this study is the importance of real encouragement and assistance to motivate business to obtain halal certification of their products.

Keywords
Halal certification, intention

Topic
Halal Food, Pharmaceutical, and Cosmetics Manufacturing

Link: https://ifory.id/abstract/VrCduhPca7jN

Corresponding Author
Ardianto Prasetiyo

Institutions
1Department of Mechanical Engineering, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
2Master Program of Mechanical Engineering, Graduate School, State University of Malang, Semarang Street 5, Malang 65145, East Java Indonesia
3Centre of Advanced Materials for Renewable Energy, State University of Malang, Semarang Street 5, Malang 65145, Indonesia

Abstract
The investigation of Titanium dioxide (TiO2) nanoparticles on thermal characteristic of Tetraselmis chuii microalgae during combustion process has been carried out through a thermogravimetric (TG) analyzer. Tetrasemis chuii microalgae samples were cultured within 8 days at BBPBAP Jepara, Central Java, Indonesia. The microalgae sediment was dried at 80oC for 24 hours then was powdered by means of a mortar. Thereafter, the dried powder of microalgae was filtered with a size of 60 mesh. Titanium dioxide (TiO2) nanoparticles were used as catalysts with the particle size of 25 nm, these were obtained from Singapore Sigma Aldrich. Amount of 0.03 mg of TiO2 and 10 mg of Tetraselmis chuii microalgae were mixed mechanically using a mortar to guarantee the homogeneous blend, and then this sample was heated up in the oven for 14 hours at 80oC. The TG experiment was performed at a temperature range 25 to 900oC with atmospheric air at a flow rate of 50 mL/min and a heating rate of 15 oC/min. Differential method of Arrhenius is applied to evaluate kinetic parameters, including reaction order (n), activation energy (Ea), and pre-exponential factor (log A). The catalytic effect of TiO2 during the combustion process is compared with the pure of Tetraselmis chuii. The overall results of the investigation will be presented in the next full paper version

Keywords
Microalgae, Tetraselmis chuii, Titanium dioxide (TiO2), combustion

Topic
Biomass, Biofuel

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

Corresponding Author
Muzayyin Muzayyin

Institutions
(a)Master Program of Mechanical Engineering, Graduate School, State University of Malang, Semarang Street 5, Malang 65145, East Java Indonesia,
(b)Department of Mechanical Engineering, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
(c) Centre of Advanced Materials for Renewable Energy, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
*Corresponding author: sukarni.ft[at]um.ac.id

Abstract
The investigation of renewable energy sources is critical regarding the availability of energy in the future. This study was aimed to understand the potential of Cerbera manghas de-oiled seed by investigating the kinetic and thermodynamic parameters during the pyrolysis process. The de-oiled seed was obtained by the pressing of the seed at 33.8192 N/m2 to release its oil content. To find out the decomposition pattern of de-oiled seed, the thermal analyzer (Mettler Toledo TG-DSC1) was occupied where the mass loss of the sample was observed and recorded during the heating process from 25 up to 900 oC with a heating rate of 15 oC/min, and the nitrogen flow rate of 50 mL/min to prevent oxidation during temperature escalation. The kinetic parameters were studied using the Coats-Redfern method. The results showed that the de-oiled seed decomposed into three stages; the first stage occurs at temperatures of 25-178 oC, the second stage occurs at temperatures of 189-488 oC, and the third stage at temperatures of 500-900 oC, with the very low residue of 15.4 % was left over at the final thermal processes. The kinetics analysis resulted in the activation energy, reaction order, and pre-exponential factor of 27.42 kJ/mol, 0.94 and 68,64 min-1, respectively. Following the kinetic results then the thermodynamic parameters were analyzed and resulted in the values of Delta H (Enthalpy), Delta G (Free Gibbs energy), and Delta S (Entropy) that were 22,40 kJ/mol, 171,86 kJ/mol, and -0,2230 kJ/mol, respectively.

Keywords
De-oiled seed, Cerbera manghas, Pyrolysis, Kinetics, Thermodynamic

Topic
Renewable Energy

Link: https://ifory.id/abstract/Nm4Ubwrxc9y7

Corresponding Author
zahir masrul

Institutions
State University Of Malang

Abstract
Dye Sensitized Solar Cells (DSSC) based on TiO2 material are very potential because of several advantages such as high photostability, high thermal stability and very effective for Dye absorption. However, TiO2 still has limitation in terms of electron mobility. It needs to be composited with other materials for electron mobility. Material that has a potential is ZnO material. beside that ZnO also has the same band gap range as TiO2. In this condition, the composite system of TiO2-ZnO becomes more potential to be used as a DSSC electrode. In the Photosupercapacitor system, with a high source of electrical energy from DSSC, a Supercapacitor unit with sufficient capacitance is also needed. In this case, the selection of capacitor electrodes is very influential. In this study, electrodes based on the BaTiO3-PVDF composite system were used. With the dielectric permittivity reaching 1700, BaTiO3 material is the main candidate for the supercapacitor dielectric material. But BaTiO3 has limitations such as fragile and unflexible nature. This limitation can be overcome in combination with the PVDF polymer which has advantage in terms of its flexible properties. Besides that, the dielectric permittivity is the most optimal compared to other types of polymers. This study examined the effect of irradiation duration and light intensity on Photosupercapacitor performance. The results showed that the length of light irradiation, photoelectric current (Isc) of DSSC (photosupercapacitor system) and capacitance (C) of Supercapacitor (photosupercapacitor system) had an exponential relation. Characterization of light intensity on photoelectric current (Isc) and potential difference (Voc) of DSSC (Photosupercapacitor system) had a linear relation. The same result also shown in the characterization of light intensity on potential difference (Vc) and capacitance (C) of Supercapacitor (Photosupercapacitor System) which produced linear relations.

Keywords
DSSC-Supercapacitor, Photosupercapacitor, TiO2, ZnO, PVDF,BaTiO3, Capacitance.

Topic
Renewable Energy

Link: https://ifory.id/abstract/ACK7m3NPuGvf

Corresponding Author
Sukarni Sukarni

Institutions
1 Department of Mechanical Engineering, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
2 Centre of Advanced Materials for Renewable Energy, State University of Malang, Semarang Street 5, Malang 65145, Indonesia

Abstract
The availability of synthetic waste (SW) continuously increases, but on the contrary, fossil fuels resources always decrease. The potential of SW for alternative fuel is critical to investigate for overcoming the problem generated from its overabundance and to provide its value-added. In this study, the changes of the macromolecular and the mineralogical during the SW combustion processes were investigated by Fourier transform infrared (FTIR) spectroscopy and x-ray diffraction (XRD), respectively. The combustion has been performed by using thermogravimetric analyzer (TGA) at a heating rate of 10 oC/min, from 25 to 1000 oC, with 100 ml/min constant flow rate of air atmosphere. According to the TGA results, the decomposition stage of the sample can be identified as a function of temperature and time. From ambient temperatures to 293 oC the sample experienced the first decomposition process that was correlated with the moisture losses and light volatile release. Macromolecular changes have occurred at the temperature 293 oC where a functional group of C-H in methylene was decomposed due to the removal of volatile matter. From the temperature of 293 to 485 oC the sample underwent the second stage of decomposition. The XRD result showed that mineral changes occurred at the temperature of 485 oC where KCl compound was formed. In line with the escalating temperature, the SiO2 was decomposed at the temperature of 590 oC. The final stage occurred at the temperature 625 to 1000 oC indicated by constant of TG line. At 625 oC, XRD result indicated the significant increasing of the CaCO3 compound.

Keywords
combustion; synthetic waste; macromolecular; mineralogical

Topic
Biomass, Biofuel

Link: https://ifory.id/abstract/UBD8MT4JRLHp

Corresponding Author
Sukarni Sukarni

Institutions
1 Department of Mechanical Engineering, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
2 Centre of Advanced Materials for Renewable Energy, State University of Malang, Semarang Street 5, Malang 65145, Indonesia

Abstract
The prospect of microalgae Spirulina platensis-synthetic waste mixture (SPSW) as alternative energy to replace fossil fuels was investigated in term of the elemental composition changes during the combustion process. The microalgae Spirulina platensis (SP) sample was achieved from BBPBAP Jepara, Central of Java, Indonesia. While synthetic waste (SW) sample was taken from the temporary shelter in Malang City. A quantity of 30% of SP and 70% SW were mechanically mixed to warranty the uniform mixture in samples powder. SPSW sample was tested its chemical content by using Energy-dispersive X-ray (EDX). To understand the stage of thermal decomposition, the samples firstly were tested under the thermogravimetric (TG) instrument. The combustion has been performed at a heating rate of 10 oC/min at the temperature range of 25-1000 oC, under 100 ml/min constant flow rate of air atmosphere. From this experiments result could be specified the temperature of onset and end of the decomposition stage. In accordance with the temperature parameters, the new samples were heated up in the furnace with the similar TGs condition. The residuals left over at every stage then were analyzed their elemental composition to evaluate the changes of their content. The TG result showed that SPSW combustion occurred in &

Keywords
combustion; Spirulina platensis-Synthetic waste mixture; elemental composition

Topic
Biomass, Biofuel

Link: https://ifory.id/abstract/9FUeRD7xE8gJ

Corresponding Author
Sukarni Sukarni

Institutions
1Department of Mechanical Engineering, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
2Centre of Advanced Materials for Renewable Energy, State University of Malang, Semarang Street 5, Malang 65145, Indonesia

Abstract
Characteristics and potential of microalgae Spirulina platensis as an energy source were studied in regard to the decomposition patterns, as well as kinetic and thermodynamic parameters. The thermogravimetric analysis was carried out using the TGA instrument (Mettler Toledo TG DSC 1) at a heating rate of 30 oC/min, with an atmospheric air flow rate of 100 ml/min at a temperature range of 25-1000 oC. The kinetic was evaluated using a differential method of Arrhenius. The results showed that Spirulina platensis microalgae decomposed into three stages. The first stage is related to the evaporation of water content, the second stage is associated with the release of volatile matter, and the final stage is the combustion stage of char. The kinetic evaluation resulted in the respective activation energy, logarithmic frequency factor (log A) and reaction order (n) are 53.57 kJ/mol, 4.4 min-1, and 1.73. It also understands from the thermodynamic analysis that the respective values of enthalpy (deltaH), Gibbs free energy (deltaG) and the entropies (deltaS) were 48.50 kJ/mol, 146,73 kJ/mol, and -174,78 J/mol.

Keywords
Spirulina platensis, Microalgae, Combustion, Kinetic, Arrhenius

Topic
Biomass, Biofuel

Link: https://ifory.id/abstract/K6YfPgMk8C4r

Corresponding Author
Sukarni Sukarni

Institutions
1Department of Mechanical Engineering, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
2Centre of Advanced Materials for Renewable Energy, State University of Malang, Semarang Street 5, Malang 65145, Indonesia

Abstract
Pyrolytic characteristics and kinetics of cassava stalk as a renewable energy source were studied using a thermogravimetric (TG) analyzer. Around 10 mg powder of the sample was heated up in the chamber under inert conditions with 50 ml/min nitrogen flow rate and operated at a heating program of 20 oC min-1. The pyrolysis process of cassava stalk was taken place into three main stages, in which the peak reaction occurred at the second stage with 70% of the mass was degraded. The differential method of Arrhenius kinetic evaluation resulted in the values of reaction order (n) that was 0.99, activation energy that was 89.46 kJ/mol and logarithmic frequency factor (logA) was 7.7 min-1.

Keywords
Pyrolysis, Thermogravimetric, Cassava Stalk, Arrhenius Method

Topic
Biomass, Biofuel

Link: https://ifory.id/abstract/84YhEVcxpu3z

Corresponding Author
Gamar Basuki

Institutions
Electronic Engineering Polytechnic Institute of Surabaya

Abstract
Induction motors are AC electric motors are the most widely used. Induction motor speed control can be done with some type of converter. However, not all types of converters can produce a great efficiency in terms of induction motor speed control. Matrix converter with venturini modultion may be a suitable option for the efficient speed control system with scalar control. Modulation switching of matrix converter was designed by Venturini. Therefore in this study MATLAB Simulink simulations to test the use modulation on matrix converter switching is Venturini method. Given this research is expected induction motor speed regulation can be more efficient in its application in the industrial world.

Keywords
Induction motor, matrix converter, Venturini modulation

Topic
Renewable Energy

Link: https://ifory.id/abstract/T4cEnHbpXhdg

Corresponding Author
Aloon EKo Widiono

Institutions
a) Department of Mechanical Engineering, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
c) Master Program of Mechanical Engineering, Graduate School, State University of Malang, Semarang Street 5, Malang 65145, East Java Indonesia
*sukarni.ft[at]um.ac.id

Abstract
Abstract. This study aims to determine the thermal characteristics of microalgae Tetraselmis chuii pyrolysis in the presence of TiO2 using thermogravimetric analysis. The algae sample was harvested after 8 days of culture on a lab scale from Jepara, Central Java, Indonesia. Meanwhile, TiO2 material that was measuring of 25 nm was obtained from Singapores SIGMA ALDRICH. The washing of the sample was done twice using distilled water, and then the algae were deposited until formed the gel. Afterward, the gel material was heated for 24 hours at 80 C to obtain a dry form. Then the dry material was broken by crusher to be a powder and then filtered on a mesh of 60. The final sample was achieved by combining 10 mg of microalgae with 0.03 mg of TiO2. To ensure the homogenius blend, the mechanically mixing process was performed by using a mortar, and subsequently, the last heating was occupied on the sample at a temperature of 80 C for 14 hours. Experiments were carried out on TG analyzer (Mettler Toledo TG DSC 1). Approximately (10.03 mg) of the sample is placed in an aluminum pan and then inserted into the chamber. The heating process was initiated at a temperature of 25 C, and constantly controlled by a computer at the rate of 10 C min until the completed temperature of 900 C. To prevent the oxidation during the thermal processes, nitrogen is chosen as a carrier gas with a flow rate of 50 ml min. From the TG experiments subsequently could be determined the mass loss of the sample during the escalation temperature and time; therefore, the thermal decomposition behavior of the material is possible to be specified. From this thermal characteristic, then the reaction kinetics, as well as thermodynamic parameters, are evaluated. By using a single heating rate, it is practicable to determine of Ea (Activation energy), A (Pre-exponential factor), and n (reaction order) using the model-fitting of Coats-Redfern. These results will be compared with the kinetic of the parent Tetraselmis chuii and will be immediately presented in the next paper.

Keywords
Thermal Characteristics, Tetraselmis chuii, Pyrolysis, Titanium dioxide

Topic
Renewable Energy

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

Corresponding Author
Selfrida Missmar Horhoruw

Institutions
(a) Center of Excellence on Resource Conservation of Tuna,

(b) Research Center for Deep Sea-Indonesian Institute of Sciences (LIPI)

(c) Department of Marine Science and Technology, Bogor University

Abstract
Banda Sea waters is the potential area for fisheries, especially for Tuna. Banda eddy and the relationship to chlorophyll-a were studied using the output of ocean circulation model INDESO (Infrastructure Development of Space Oceanography) configuration from 2008-2011 during normal (June-August 2008) and ENSO (El Nino/ June- August 2009 and La Nina/ June-August 2010). The model result showing two clockwise eddies in the northern part of Banda sea and three counterclockwise eddies in the southern part of Banda Sea. The eddy counterclockwise was found from 20 m depth and causing upwelling along the island arc on the western edge of Banda sea. Eddy counterclockwise in the southern of Banda Sea cause the downwelling. The presence of these 5 eddies is thought to be an important factoring in maintaining water balance system in the Banda Sea as long as southeast monsoon period. In the surface, higher vorticity of the eddy was found in the northern of southwest Maluku Island. The presence of this eddy is thought to have a strong influence on nutrient loss on the surface. Our research shows that during the La Nina period, the eddies vorticity increased causing low surface chlorophyll in the surface the Banda Sea.

Keywords
Banda Eddy, ENSO, chlorophyll-a, upwelling, downwelling, INDESO

Topic
Coastal and Ocean Dynamics

Link: https://ifory.id/abstract/Ehc3ALuWv7XH

Corresponding Author
Fismatman Ruli

Institutions
Center for Deep-Sea Research, Indonesian Institute of Sciences

Abstract
Updated information regarding tunicates distribution and diversity in the northern waters of Ambon Island is scarce, if any. We carried out an assessment using underwater census approach in June 2018 to obtain the said information. Tunicates composition and distribution were described based on six sampling stations observations. Their average density in five of six stations was less than one individual per meter square. Predominant species observed were Didemnum molle, followed by Polycarpa aurata. Tunicates belong to Didemnum molle were highly abundant in three stations (Morella, Hitu and Larike). Those identified as Polycarpa aurata were predominant only in two stations (Mamala and Wakal). Further studies are needed to investigate the anthropogenic pressure effect on these tunicates, as they were known as biomarkers in ecotoxicological studies.

Keywords
tunicates, Banda Sea, ecology

Topic
Marine Resources, Conversation and ICZM

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

Corresponding Author
Shelly Efwinda

Institutions
a) Physics Education, Faculty of Teachers Training and Education, Universitas Mulawarman, Jl.Muara Pahu Kampus Gunung Kelua, Samarinda 75123, Indonesia
*shelly.efwindaa[at]gmail.com
b) Science Education, School of Postgraduate Studies of Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No.229, Bandung 40154, Indonesia

Abstract
Pedagogical Content Knowledge (PCK) is the ability to teach a content on a particular concept so students can master the concept correctly. One characteristic of qualified teacher is having excellent PCK ability. The purpose of this study is to obtain an PCK ability profile of prospective physics teachers in reflecting project-based learning (PjBL) that had been carried out. This research is a qualitative research with narrative research design. The data collection instrument in this study is Pedagogical and Professional-experience Repertoires (PaP-eRs). The subjects in this study are 13 physics students (prospective teachers) in one of State University of East Kalimantan. The results shows that the average value of PCK ability of prospective physics teachers in reflecting PjBL is 50% in sufficient category. Based on the results of study, academics or stakeholders need to add adequate facilities as a means for students to practice teaching, develop teaching materials, and master the concept of physics better.

Keywords
Pedagogical Content Knowledge (PCK); Project based Learning (PjBL); Professional-experience Repertoires (PaP-eRs)

Topic
Physics Education

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

Corresponding Author
Angeline Viska Ayu Rosalia

Institutions
Magister of Chemistry Education Study Program, Postgraduate School, Universitas Negeri Medan, Medan 20221, Indonesia(1)
Departement of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia (2)

Abstract
The aim of this research was to know the gain of students achievement that taught by using dubido. The research has been done in Chemistry Educational Study Program in Unimed. The experimental class was given treatment with teaching by using dubido media based on contextual. The experimental class has fulfilled the requirement for normality and homogenity test. The mean of pretest results and posttest results were 42.240 and 84.480. The increase of posttest results indicated that learning by using dubido based on contextual can improve students achievement. The increase of students achievement signed by gain percent with the percent of gain value was 73.3. The result of t test was obtained from tcount is more than t table (2.590 is more than 1.677) at alpha is 0.05, it means that the implementation of dubido based on contextual was given positive effect to increase students achievement.

Keywords
Contextual, Dubido, Rate reaction, Students Achievement

Topic
Chemistry Education

Link: https://ifory.id/abstract/erdWwKXmb2Nz

Corresponding Author
Juang Akbardin

Institutions
Civil engineering of Universitas Pendidikan Indonesia

Abstract
Generating and atracting movements is a phenomenon of need for distribution in a zone in a region. Movement distribution model has an important role to increase economic and regional growth. The model design strategy is determined based on alternative supply and demand generation and the atractionl of movement. The need for strategies to limit supply and demand is determined by restrictions on generation or atraction of movement. The method of limiting the generation or atraction of movement as a distribution system model solution is single constraint. Distribution system modeling with one limitation is based on gravity modeling. Distribution system simulation modeling is built the gravity algorithm. Distribution system starts from constructing generation models with variables that determine the generation of movement. The socio-demographic, infrastructure and freights vehicle are used in this variable modeling. The model was tested with statistical parameters with a test of determination and correlation test. Distribution system modeling is then accumulated in computational models of basic matrices that are defined based on the specified zone. The matrix iteration process in the model calibration will determine results of distribution system model with results of matrix convergence defined.

Keywords
Modeling, distribution systems, transportation of freights, gravity algorithms, single constraints

Topic
Computer Science

Link: https://ifory.id/abstract/p4T2tX7PCrhc

Corresponding Author
Eka Danti Agustiani

Institutions
a) Pusat Pengembangan dan Pemberdayaan Pendidik dan Tenaga Kependidikan IPA
Jalan Diponegoro 12 Bandung 40115, Indonesia
b)Universitas Pendidikan Indonesia
Jalan Setiabudi 229, Bandung 40154, Indonesia

Abstract
The scientific competence indicators used by OECD in PISA year 2015 are (1) describe phenomena scientifically, (2) design and evaluate scientific enquiry, and (3) interpreting data and evidence scientifically. Those indicators are compatible with HOTS perspectives as they need the three highest cognitive process dimension namely analyse, evaluate and create. To fostering students scientific competency in science learning, teachers must be mastering it first. This study aims to get the teachers scientific competences profile based on OECD indicators in HOTS perspective. From written test done by teachers, it was found that capability in performing those three scientific competence indicators are still in less qualified.

Keywords
Teacher; Scientific competence; HOTS

Topic
Integrated Science Education

Link: https://ifory.id/abstract/kp4aTUXKrwYj

Corresponding Author
M Khoerul Mubin

Institutions
UNIVERSITAS AIRLANGGA

Abstract
Indonesia is one of the countries experiencing economic growth problems. The purpose of this study is to examine and analyze the effect of foreign loans,the exchange rate of rupiah/ USD, inflation, the Fed Rate, and exports to Indonesias economic growth. The method of research in this study is ECM with period 2004 quarter I-2016 quarter IV. The conclusion is that in the long term, the variable of rupiah/USD exchange rate(X2) has a significant negative effect on economic growth, The Fed Rate(X4) has a significant positive effect on economic growth,and exports(X5)have a significant positive effect on economic growth,while in the short term variable exports(X5) have a significant positive effect on economic growth.

Keywords
economic growth, foreign loans,the rupiah/USD exchange rate,the Fed rate, inflation, exports

Topic
Modeling, Simulation and Optimization

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

Corresponding Author
Ponirin Ponirin

Institutions
Fakultas Ekonomi dan Bisnis
Universitas Tadulako

Abstract
Penelitian ini bertujuan untuk menguji peran e-service quality dalam memengaruhi e-loyalty dengan variabel e-satisfaction sebagai mediator pada konsumen Shopee di Kota Palu. Jumlah sampel dalam penelitian ini sebanyak 60. Pengambilan sampel dengan menggunakan accidental sampling. Metode analisis yang digunakan dalam penelitian ini adalah Partial Least Square dengan bantuan program statistik SmartPLS 3.0. Hasilnya adalah e-service quality berpengaruh signifikan terhadap e-satisfaction konsumen Shopee di kota Palu; e-service quality tidak berpengaruh signifikan terhadap e-loyalty konsumen Shopee di kota Palu, e-satisfaction berpengaruh signifikan terhadap e-loyalty konsumen Shopee di Kota Palu; e-service quality menunjukkan pengaruh signifikan terhadap e-loyalty melalui e-satisfaction konsumen Shopee di kota Palu, dengan t-statistik (>1,96) dan p-value (<0,05).

Keywords
e-service quality, e-satisfaction, e-loyalty

Topic
Manajemen Pemasaran

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

Corresponding Author
Andi Indahwaty Sidin

Institutions
(a) Public Health Faculty, Hasanuddin University, Indonesia
(b) Public Health Faculty, Hasanuddin University, Indonesia
(c) Public Health Faculty, Hasanuddin University, Indonesia
(d)Public Health Faculty, Hasanuddin University, Indonesia

Abstract
One of critical factor for creating organizational citizenship behavior (OCB) is cultural value. Bugis is one of important tribe in Asia, not only in Indonesia, the buginese population also spread on Asia, and South Africa.This study-s aim was to explore the role of cultural values of buginese in creating the OCB of civil servants at local hospital in Makassar city, Indonesia. It was a cross sectional study. The population was 265 and 106 sampel was selected from all buginese staff in hospital. Data was analyzed by Spearman correlation test. The Spearman-s rho value was 0,314 with p.value <0,05. There was a relationship between siri na pesse value of buginese and OCB. It was implied that buginese staff may have high performance due to high OCB, hospital manager is supposed to foster the cultural value of staff to increase their OCB.

Keywords
Cultural, Value, Buginese,OCB

Topic
Human Resources Management

Link: https://ifory.id/abstract/Pym86BNDWHub