Indonesia Conference Directory

Corresponding Author
Dwi Riana Aryani

Institutions
Department of Electrical Engineering, Faculty of Engineering, Universitas Indonesia

Abstract
Photovoltaic (PV) is known as an intermittent energy source so that the impacts need to be calculated by the developer. In order to ensure the presence of PV does not cause the reliability of the system interrupted, developers are required to perform the stability study before the integration. In this paper, voltage stability study is done by using various PV capacities ranging from 5 MWp to 15 MWp in systems with a capable capacity of 90.79 MW using software ETAP 12.6.0. PV generation is set at the maximum site irradiance where power drop due to weather condition. The analysis shows the system stabilized in less than 50 seconds where the voltage disturbance does not exceed 10% for PV with a capacity of 5 and 10 MWp which is connected to a distribution network. Meanwhile, PV with a capacity of 15 MWp requires load release in order to regain stability.

Keywords
Integration, Lombok, photovoltaic, voltage stability.

Topic
Electrical Engineering

Link: https://ifory.id/abstract/h3MbNZcpVr8u

Corresponding Author
Hafzoh Batubara

Institutions
Industrial Engineering, Tanjungpura University, Jl. Prof. Dr. H. Hadari Nawawi, Pontianak, Indonesia
Industrial Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia

Abstract
Rumah Sakit Jogja is one government hospital located in the city of Yogyakarta. The index value of the service quality of the city of Yogyakarta that is below standard thus the need for improvement. Improvements focused on outpatient departtement because it has the highest percentage of patients. The selected object is Badan Pelayanan Jaminan Sosial (BPJS) service system because it has the biggest percentage of patient type at the outpatient department and has longest path. Lean methods used to make improvements to reduce the waste that exists. This research use few tools like Value Stream Mapping (VSM) for mapping BPJS service process, Failure Mode and Effect Analysis (FMEA) to search the critical problem, Fishbone diagram to search roots of FMEA problems, and simulation to see result of the improvement system. The FMEA show that queue is the most critical problem with Risk Priority Number (RPN) value 200. After that, the author created five improvement scenarios and found the best scenario is the fifth scenario with make all counter shift equal. Such scenarios may result in decreased activity of Non Value Added Activity (NVA) time by 31 seconds so we get used to the NVA time is 4 seconds.

Keywords
Lean Healthcare, Value Stream Mapping, Fishbone Diagram, Failure Mode and Effect Analysis, Simulation

Topic
Industrial Engineering

Link: https://ifory.id/abstract/E2wVpmQaNUru

Corresponding Author
Rosada Naulina

Institutions
Institute Technology of Sepuluh Nopember

Abstract
Intensification of biodiesel and other chemical products (ethyl levulinate) from rice bran using in-situ transesterication method without catalyst in subcritical ethanol – water has been investigated. This method known to be economical because the experiment steps are reduce and environmentally friendly because we no use a catalyst. Then, the method found to be unaffected in Free Fatty Acid (FFA) contents in rice bran and moisture, so that pretreatment was no required. In this experiment used CO2 as a pressure gas and ethyl acetate as co- solvent for increasing the yield. This reactor is equipped with a stirrer used a magnetic stirrer of rice bran, a mixture of water, ethanol and ethyl acetate in mol ratio 1: 10: 9: 2 and was inserted into the reactor, then injects CO2 gas to increase the pressure and to ensure the reaction occurs under subcritical conditions under an operating pressure of 80 bar. Temperature (120 – 200ᵒC) and reaction time (30 minute - 4 hours) were investigated to increase yield biodiesel and chemicals. It has been known that a longer time affects the increase in the yield of biodiesel chemicals followed by an increase in reaction temperature (200ᵒC).

Keywords
rice bran; biodiesel; subcritical

Topic
Chemical Engineering

Link: https://ifory.id/abstract/xtU2uvy3TPH4

Corresponding Author
M. Fariz Yasmin

Institutions
Department of Chemical Engineering, Faculty
of Industrial Technology, Institut Teknologi
Sepuluh Nopember, Sukolilo, Surabaya 60111 Indonesia

Abstract
Biodiesel is a promising alternative fuel to replace petrodiesel. Because biodiesel is renewable, non-toxic, biodegradable, has a low emission profile, and is environmentally friendly. However, the cost of producing biodiesel is higher than petrodiesel. Although biodiesel can be made from various raw materials including vegetable oil, animal fat, and used frying oil, mass production of biodiesel still uses processed vegetable oil. About 60 until 75 percent of the total cost of producing biodiesel comes from raw materials. Therefore, in this study used affordable raw materials, not food and abundant amounts of oil from rice bran. However, rice bran oil has a variety of impurities and the levels are quite high. In this study green solvent is used, namely deep eutectic solvent (DES from ChCl and Ethylene Glycol) and natural deep eutectic solvent (NADES from Betaine Monohydrate and Glycerol) to remove impurities contained in biodiesel from rice bran oil. This study aims to study the comparison of single-stage extraction (single extraction) and multi-stage extraction (multiple extraction) and the effect of stirring speed (laminar until turbulent condition) with DES and NADES solvents on the purity and yield of biodiesel produced. Hence, biodiesel obtained is meets Indonesia national standards (SNI 7182: 2015) with low production costs and is easy to apply on an industrial scale.

Keywords
biodiesel, rice bran oil, purification, Deep Eutectic Solvent, Natural Deep Eutectic Solvent

Topic
Chemical Engineering

Link: https://ifory.id/abstract/4hURLDWu8dzp

Corresponding Author
Afifatul Jannah

Institutions
Chemical Engineering Department, Industrial Technology Faculty, Sepuluh Nopember Institute of Technology, Surabaya, Indonesia

Abstract
Rice bran has a high content of antioxidants and vitamin E so that it can reduce cholesterol levels, become an antidote to free radicals, and is good for skin health. This rice bran can be processed into edible oil, but too high a level of FFA can disrupt the quality of crude rice bran oil as it causes a rancid odor. Deasidification is a process to eliminate high levels of Free Fatty Acid (FFA) in crude rice bran oil (CRBO). There is a biological deasidification process using enzymes, but enzymes are still considered too expensive to use. The chemical and physical deasidification process is a commonly used process. The chemical deasidification method is carried out by adding alkaline solutions to oils containing low FFA with the advantage of leaving FFA of 0.5-2%, but can significantly eliminate the content of neutral oils and bioactive components such as oryzanol. Physical deasidification using distillation requires high energy, although the results obtained are quite good. Another physical deasidification method being developed is liquid-liquid extraction (LLE) which can minimize energy consumption levels and lose bioactive components. Physically deasidification using the liquid-liquid extraction method will be applied in this study using green solvents which are non-toxic, non-volatile, non-flammable, recyclable. The green solvent used is Deep Eutectic Solvent (DES) from Choline Chloride - Ethylene Glycol with a ratio of 1: 2 molar ratio and Natural Deep Eutectic Solvent (NADES) from Betaine Monohydrate - Glycerol with a 1: 8 molar ratio. The purpose of this study is to study the DDRBO deasidification process using DES and NADES in single extraction and multiple extraction, the effect of DES and NADES on the rate of FFA and recovery γ-oryzanol at each stage, and the effect of initial FFA levels (5%, 10%, 20 %, 30%, 40% and 60%) of using DES and NADES in eliminating FFA. Rice bran oil containing the initial FFA content will be mixed with a solvent then stirred while heated at 50oC for 240 minutes. The results obtained at each stage were tested using saponification value analysis and gas chromatrography mass spectrophotometry analysis to determine the level of FFA in oil, as well as UV-Visible Spectrophotometer to determine oryzanol levels in oil. With the deasidification process in this study, FFA in CRBO can be completely removed without disturbing the composition of bioactive components using the method of liquid-liquid extraction multi extraction with green solvent which is safer for the environment.

Keywords
Betaine Monohydrate, Choline Chloride, Deacidification, Liquid-liquid Extraction, Rice Bran Oil

Topic
Chemical Engineering

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

Corresponding Author
Medina Yasmin

Institutions
a) Deparment of Chemical Engineering, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Keputih Sukolilo, Surabaya 60111 Indonesia
*szulle[at]chem-eng.its.ac.id, szullehakim[at]gmail.com

Abstract
A direct conversion to produce biodiesel and chemicals from wet algae under subcritical water-ethanol mixture was presented in this work. This method is known as a green synthesis due to no catalyst required and unaffected by initial moisture content of the feedstock. In this study, carbon dioxide as pressurized gas and ethyl acetate as co-solvent were used to elevate the yield and purity of biodiesel and chemicals. Temperature (125-200oC), reaction time (15-120 minutes), and algal water content (90-200%) were investigated to optimize yield and purity of biodiesel and chemicals. Wet algae has been subjected into hydrothermal reactor together with water-ethanol-ethyl acetate mixture to produce microalgae-based biodiesel. It has been revealed that longer reaction time affected in increasing yield of biodiesel and chemicals while increasing temperature to 200oC had slightly effect in elevate yield and purity of both products required. Moreover, low moisture content of algal still preferred to achieve high yield of products

Keywords
wet microalgae; fatty acid ethyl esters; ethyl levulinate; subcritical water-direct conversion

Topic
Chemical Engineering

Link: https://ifory.id/abstract/xEkqXy3NPzwB

Corresponding Author
Rahmayetty Rahmayetty

Institutions
Chemical Engineering Department, Universitas Sultan Ageng Tirtayasa

Abstract
Lactic acid is a chemical with widwe variety applications that pharmaceutical, cosmetic, food industries, etc. One of the major uses of lactic acid is the polylactic acid (PLA) feedstock which is biodegradable and biocompatible as an alternative to plastic derived from fossil fuels. Efforts continue to be made to reduce the cost of producing PLA in order to compete with conventional petrochemical-based plastics. Efforts made include using molasses as a raw material because it is cheap and contains high glucose. The purpose of this study was to obtain the best substrate input system by comparing batch and fed batch systems to obtain the optimum loading concentration in lactic acid synthesis. This study was conducted in several stages, namely the design of bioreactors, inoculation of Lactobacillus achidopillus, fermentation of molasses and purification of lactic acid. In a batch system, molasses substrate was directly inserted as much as 1 liter in the fermentor, while in the substrate fed batch system was inserted simultaneously using a dossing pump with varying loading rates of 75; 100; 150 and 250 ml/hr, up to a total volume of 1000 ml. The analysis carried out on fermentation products was the cell concentration, lactic acid and total sugar cocentration. The results of this study indicate that fed batch fermentation produces higher concentrations of lactic acid.

Keywords
molasses, batch, fed batch, lactic acid, Lactobacillus achidopillus

Topic
Chemical Engineering

Link: https://ifory.id/abstract/LvcYAjw9d6gF

Corresponding Author
Masaji Suryo Jatmiko

Institutions
Institut Teknologi Sepuluh Nopember
Jl. Raya ITS, Keputih, Kec. Sukolilo, Kota SBY, Jawa Timur 60111

Abstract
Deep eutectic solvents (DESs) have been proposed as a replacement to toxic and volatile organic solvents in biodiesel production, used to minimize methanol inhibition effect and enhance the stability of enzyme with low cost so that make the overall process is feasible. In this work, we use low-cost deep eutectic solvents (DESs) a new solvent for biodiesel production from wet microalgae. An energy efficient extraction of alga lipids from wet alga biomass was performed at subcritical condition of water. Subcritical water using DES as co-solvent Choline Chloride and Acetic Acid of algae lipid from wet pastes of Chlorella vulgaris (water content is 80-90%) was examined to investigate the influence of co-solvent ratio (1:2, 1:3, 1:4, 1:5, 1:6), temperature extraction (T (oC) = 125, 140, 160, 180, 200), biomass to solvent ratio, and extraction time (t (min) = 15, 30, 45, 60, 120) on the yield of biodiesel produced. This process is effective on wet and unbroken paste of microalgae biomass, so the FAME extracted using one-step with DES process is feasible for microalgae based biodiesel production. Further we optimized the extraction process and studied on its underlying mechanism. Among all ratio, Choline chloride-Acetic acid DES treatment showed optimal conditions at the mass ratio of DES: ethanol: algae biomass was 20:8:1 with reaction time was 60 min.

Keywords
Microalgae, Lipid Extraction, Deep eutectic solvents, Subcritical Extraction

Topic
Chemical Engineering

Link: https://ifory.id/abstract/qD9Qp8Nrd3ew

Corresponding Author
Nadiyah Annisa Fitri

Institutions
Institut Teknologi Sepuluh November

Abstract
Biodiesel is one of the alternative energy that is environmentally friendly and can be renewed. In general, biodiesel is made through a transesterification reaction between oil and ethanol with the help of a base catalyst. However, one obstacle to the commercialization of biodiesel is the high cost of production. Cheap raw materials (rice bran oil) contain high free fatty acids (up to 60%) therefore the transesterification reaction is only possible using an acid catalyst and the rate of the transesterification reaction is slower under conditions using an acid catalyst. In addition to further reducing the cost of production is by carrying out a transesterification reaction under mild reaction conditions, namely at room temperature and atmospheric pressure. Therefore, this research will be assisted by high shear mixing so microemulsion formed to minimizing mass transfer resistance and reaction can occur. The effect of dispersion speed, catalyst amount, reaction time and molar ratio between ethanol and rice bran oil were investigated so the cost of production can be reduced. In addition, the energy consumption needed for biodiesel production from rice bran oil assisted by high shear mixing is lower than conventional or subcritical / supercritical methods.

Keywords
Biodiesel, Rice bran oil, High shear mixing, Microemulsion, Sustainable

Topic
Chemical Engineering

Link: https://ifory.id/abstract/xwPpv8VqGcab

Corresponding Author
Sanggono Adisasmito

Institutions
Chemical Engineering Department
Institut Teknologi Bandung
Indonesia

Abstract
The need for energy use is increasing along with population growth, increasing energy consumption by the community, and due to the use of various types of equipment to support comfort. Biogas production contributes as a sustainable renewable alternative energy because raw materials are easily obtained and economical. However, biogas emissions can cause damage to the environment due to the presence of hydrogen sulfide pollutants. One method that can be used for this separation is adsorption using laterite soil. The advantage of using laterite soil as an adsorbent is that it is cheap, easy to obtain, and adsorption can occur at room temperature. In this study, the parameters to be varied are particle size and mass of laterite soil used. Before use, the laterite soil is dried first at 100oC for 1 hour. The process of separating hydrogen sulfide from biogas was carried out by flowing biogas into the adsorption column with a diameter of 2.5 cm containing adsorbent of laterite soil. Variations in the experiment are particle size, 6 and 21 mesh, and bed mass is 30 and 50 grams. The biogas flow rate is kept constant at 1.5 liters / minute. The particle size and bed mass affect the performance of adsorption. Reduction of particle size of the adsorbent from 6 to 21 mesh caused the hydrogen sulfide adsorption capacity to increase to 2.13 times. The bed mass addition from 30 g to 50 g caused the hydrogen sulfide adsorption capacity to increase to 1.15 times. The adsorbent worked optimally when the particle size was 21 mesh and with a mass of 50 g which had hydrogen sulfide adsorption capacity up to 14.96 mg H2S / g adsorbent.

Keywords
adsorption, biogas, hydrogen sulphide, laterite

Topic
Chemical Engineering

Link: https://ifory.id/abstract/J6QM2mheZkpW

Corresponding Author
Wahyu susihono

Institutions
1,2 Industrial Engineering Department, Engineering Faculty, University of Sultan Ageng Tirtayasa, Banten, Indonesia
3 Electrical Engineering Department, Engineering Faculty, University of Sultan Ageng Tirtayasa, Banten, Indonesia

Abstract
Companies that already have a halal product certificate have a minimum certificate of Halal Product Guarantee status by criterion B. However, up to now not many companies have obtained it due to the incompleteness of the Halal Assurance System (SJH) manual document. Gipang Tiga Bunda cake industry is one of companies that has been certified halal by LPPOM MUI Banten Province, but the SJH Status certificate has not been given to the company. This condition is due to the fact that the company has not yet completed the HAS-23000 document specifically for the overall fulfillment of eleven criteria for the Halal Assurance System (HAS 23000: 1) , Policies and Procedures (HAS 23000: 2). This study aims to determine the improvement in the implementation of HAS-23000 in the Gipang Tiga Bunda cake industry, so that finally an intervention model can be found that is in accordance with the abilities, abilities and limitations of humans working in the cake processing industry. This research method is in the form of exploratory design. Observations were carried out directly and carried out deep interviews with company management or employee representatives who worked for at least 3 years in a row. The results showed that ergonomic interventions can improve the implementation of the criteria a) the mechanism for establishing a halal management team, b) preparing halal policies, c) scheduling training and education, d) the mechanism for using production facilities, e) internal audit activities and f) review activities management. Ergonomics intervention is able to make humans as a system unit in implementing HAS-23000 implementation.

Keywords
Ergonomics intervention, HAS-23000, Halal, processing industry

Topic
Industrial Engineering

Link: https://ifory.id/abstract/MQVAFwm3EuGh

Corresponding Author
Rifky Ujianto

Institutions
Departement of Civil Engineering, Universitas Sultan Ageng Tirtayasa, Banten, Indonesia

Abstract
Waterfront area currently has a potential as a face of the city, it should not only being the behind area of the city. Waterfront area can be a tourist destination and a place that create social interaction, so that area can be the center of economic growth for the city especially in the field of tourism activity. Waterfront development experience many problems such as the loss of place quality. In the other side, private investment is not clearly regulated and causing the privatization of land in the shoreline area that should be the public space. Communities that received the impact of the development in the shoreline area are not to get involved in the planning process. These conditions impact that people can not freely access the beach. It happens because currently there is no policy to regulate and control the growth of the area as a tourist destination. This study formulates the design of tourism public space in a seaside area with attention to the image of an area and have the quality of public space. By analyzing the design area both regionally and environmental context, and including aspiration preferences of each stakeholders interest in the findings obtained several principles that need to be considered to create a coastal tourist area as public space. In this study, planning and designing is required to involve the community as a preferences and created a partnership program between the investor and the government as policy makers. With this cooperation, the growth of coastal resorts can be run as a shared vision that avoids conflicts of interest.

Keywords
Tourism, Waterfront, Public Space, Carita Beach, Banten.

Topic
Civil Engineering

Link: https://ifory.id/abstract/gJdV6DmRPa7x

Corresponding Author
Yunita Pujiastuti

Institutions
Institut Teknologi Sepuluh Nopember
Jalan Raya ITS, Surabaya, Indonesia

Abstract
Rice (oryza sativa) bran is a byproduct generated in the process of rice milling. Moreover, subcritical method as a promising alternative solvent for chemical reaction, separation and extraction process and its nontoxic, inexpensive and invorementally benign, to increase levulinic acid in subcritical needs to be studied with ethanol-water mixture. While, ethanol is capable of hydrogen bonding and dipole-dipole interaction with organic acid and it is conveniently available and stable for hydrogenation. At the same time, carbon dioxide was use as a pressurizing gas and the solvent etanol-water mixture with the concentration (0:100, 25:75, 50:50) with the temperature was used at 160, 180 and 200 0C for 20, 30, 40, 50 and 60 minute reaction in the reactor.

Keywords
levulinic acid, rice bran, subcritical method, hydrolisis, ethanol-water mixture

Topic
Chemical Engineering

Link: https://ifory.id/abstract/4AFD2QzUnkcC

Corresponding Author
Mega Nur Prabawati

Institutions
1. Pendidikan Matematika, Universitas Siliwangi, Jl. Siliwangi No. 24 Kota Tasikmalaya, Jawa Barat Indonesia

2. Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229 Bandung 40154 Jawa Barat Indonesia

Abstract
Having good mathematical literacy skills is expected to help students solve problems related to mathematics. The focus of mathematics literacy skills on students is the ability to analyze, justify, and communicate ideas effectively, formulate, solve and interpret mathematical problems in various forms and situations. This study aims to describe students mathematical literacy skills seen from gender differences. The approach used in this study is a qualitative approach with case studies. The study subjects consisted of two male students and two female students from junior high school students. Data was collected through analysis of student work results and interviews.. Students are asked to convey what they are thinking when solving problems in a given mathematical literacy test. After students finish getting the solution from the problem, the researcher classifies the students answers and analyzes them. Furthermore, the data obtained are grouped and analyzed according to indicators of mathematical literacy skills. Male students have good results from each indicator in mathematical literacy ability, namely in the first indicator of the sixth indicator, while for female students have good mathematical literacy skills for the first indicator, second indicator, third indicator, fourth indicator and sixth indicator, except for the fifth indicator, female students have sufficient mathematical literacy skills.

Keywords
Literacyt, Mathematicall literacy skill, gender.

Topic
Mathematics Education

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

Corresponding Author
Muhammad Ghiyats Ristiana

Institutions
Department of Mathematics Education, Universitas Pendidikan Indonesia
*kanghiyats[at]upi.edu

Abstract
A teacher should present a lesson concept well, not just only using it to solve a question on exams. However, teacher should make their students understand all of the concepts. This thing should be built since we are in a golden age or in elementary school. Elementary school teacher should have better skills in teaching, because they teach a lesson base, especially mathematics. If students do not understand the base of mathematics, they will not able to solve more complex mathematics problems. Therefore, logical thinking skill is needed for this, especially for an elementary school teacher. The aim of this research is to see whether students of prospective elementary school teacher have a good logical thinking skill or not. In order to do so, we used descriptive qualitative method. We presented an easy mathematics questions to see their logical thinking skills. The result shows that prospective elementary school teacher students did not have good logical thinking skills yet. They still should increase their logical thinking skills to be a better teacher. Their lecturer should have a better teaching concept to make a better elementary school teacher later.

Keywords
Logical Thinking Skills; Primary School Teachers; Mathematics; Prospective Teachers

Topic
Mathematics Education

Link: https://ifory.id/abstract/WYmtv2BQPJdb

Corresponding Author
Rita Susanti

Institutions
IKIPSILIWANGI

Abstract
ABSTRACT This study is a quasi-experimental study that aims to compare the mathematical communication skills between students who get the Think Talk Write (TTW) learning model and the Group Investigation (GI) Learning Model, examine their quality improvement and examine students attitudes towards Think Talk Write (TTW) learning models. ) and Group Investigation (GI) Learning Models. The population in this study were all students of class VIII 1 of Leuwigoong Junior High School, with a sample of two classes, namely: class VIII-E as the experimental first class who received the Think Talk Write (TTW) learning model and class VIII-H as the experimental second class that obtained the Model Group Investigation (GI) Learning. The instrument used was a description of mathematical communication skills and attitude scale. The results of data analysis showed that the mathematical communication skills of students who got the Think Talk Write (TTW) learning model were no better than those who received the Group Investigation (GI) Learning Model. Quality Improvement of mathematical ability of experimentalfirst class students who get the Think Talk Write (TTW) learning model with the moderate category and for the improvement of mathematical communication skills of the experimental second class students who receive the Group Invertigation (GI) learning model with the moderate category, and for student attitudes towards mathematics learning using Think Talk Write (TTW) and Invertigation learning models (GI) both interpret well.

Keywords
Mathematical communication skills, Think Talk Write (TTW) models, Group Invertigation (GI) models.

Topic
Mathematics Education

Link: https://ifory.id/abstract/b6EfxN2mgr8X

Corresponding Author
Odorlina Marbun

Institutions
IKIP Siliwangi

Abstract
The purpose of this study is to development research of matematical comunication ability and self regulated learning. The good matematical comunication ability can solve matematicaly problem and self regulated learning maturity will seem in doing matematicaly activity The sucses matematicaly factor were interested students and teacher spirit to development learning ability so that does not cause bore in the class, to construct interest and motivation in learning activities so boredom that are erasier and more enjoyable and matematicaly comunication ability taught self regulated learning when snowball throwing aproach. The experiment to invold 25 grade -7 students in Karawang , Jawa Barat district. The instruments are matematical comunication and self regulated learning abilities test and opinion scale. The study found that: a) Excelent of snowball throwing to improve approach matematical comunication ability students. b) Descripe of matematicaly comunication ability students with low and high very good. c) There was high association betwen matematical comunication ability and self regulated learning. c) Students interested and enjoyable to snowball throwing approach.

Keywords
snowball throwing,matematical comunication

Topic
Mathematics Education

Link: https://ifory.id/abstract/RM6ga23vrCVA

Corresponding Author
Siti Ruqoyyah

Institutions
IKIP Siliwangi

Abstract
The background of this study is the lack of ability of PGSD Siliwangi PGSD students to analyze innovative mathematics learning models. The purpose of this study was to improve the analysis and implementation skills of PGSD students regarding innovative mathematics learning . The specific target to be achieved in this study is the formation of appropriate and efficient teaching materials in the implementation of elementary school mathematics learning internships. This study uses a quantitative approach and uses a quasi-experimental method. The population in this study were primary teacher Educationstiudents of IKIPSiliwangi, while the sample consisted from 70 maha students are divided into 35 students in class A1 class of 2017 as an experimental group and 35 Most students in class A2 class 2017 as a control group . The instrument used consisted of a written test regarding learning models innovative , observation and interviews. The results show that there is an increased ability to analyze student by using model-modelinnovative learning better than usual learning.

Keywords
Ability to Analyze, innovative learning models.

Topic
Mathematics Education

Link: https://ifory.id/abstract/Qu8VKGY7xWgH

Corresponding Author
Zuida Ratih Hendrastuti

Institutions
Tidar University

Abstract
The aims of this study were to develop a product in the form of mathematics learning with a RME approach that is oriented to mathematical connection skills and student confidence with valid, practical, and effective qualities. The materials developed consists of lesson plan, student-s works sheet, and tes learning outcomes. This research was a research development with the reference ADDIE. The results of the study show that the learning devices developed valid are indicated by the results of the assessment of each learning device having an average score with the criteria of "very good". Practical assessment is indicated by the results of the teachers assessment of the learning device which is 30 with the criteria of "very good", while the assessment by students is 87.10% with the criteria of "good", and the average learning implementation is 83.88%. Effective assessment is indicated by the results of the results of the mathematical connection ability test of 83.33% and the student confidence questionnaire has a presentation of 86.67%.

Keywords
development, realistic mathematics education approach, mathematical connection, self-confidence

Topic
Mathematics Education

Link: https://ifory.id/abstract/ZGANKh47DyM8

Corresponding Author
Reni Astuti

Institutions
IKIP PGRI Pontianak

Abstract
This study aims to look at the role of van Hiele model learning with the Local Wisdom-based Contextual Approach in building individual character and group character of students. The population in this study were eleventh grade students in the city of Pontianak with a sample of 75 students. Based on the results and discussion, it was concluded that (a) on individual characters for each aspect of individual character, namely meticulous, creative, unyielding, and curiosity in Van Hieles learning class with a Local Wisdom-based Contextual Approach (PVKK) was better than ordinary learning (PB). ; (b) on group characters for each aspect of group character, namely aspects of leadership, mutual respect, cooperation, and caring attitude in the PVKK class is better than PB class. All aspects of the individual character of students both in the PVKK class and in PB classes have the same category which is starting to develop. Whereas in the aspect of group character both in the PVKK class and in the PB class almost all have categories of developing (MB), except for aspects of leadership in PB classes that have a visible category (MT).

Keywords
individual character, group characters, van Hiele model learning with the Local Wisdom-based Contextual Approach.

Topic
Mathematics Education

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

Corresponding Author
Ahmad Romdon

Institutions
1 Centre of Excellence for Tuna Resources Conservation (CoE TRC), Centre for Deep-Sea Research Indonesian Institute of Sciences (CDSR-LIPI), Jalan Y. Syaranamual, Guru-guru Poka, Ambon Maluku 97233
*ahma077[at]lipi.go.id
2 Yayasan Biodiversitas Indonesia (BIONESIA), Jalan. Tukad Balian No. 121 Denpasar, Bali 80226

Abstract
Conserving tuna stock, biological information of tuna larvae is essential for understanding spawning ground and spawning time. However, morphological identification of larval is difficult and often times questionable. Meanwhile, genetic identification is useful and helpful to confirm the morphological identification result. This study purpose is to confirm a morphological identification result with genetic identification and determine the tuna species exactly. Specimens used in this research were obtained from a survey conducted in the Banda Sea in October 2018. Samples were collected by a bongo net towed obliquely. Morphological identification is to the tribe level, regarding the key features of the meristic and morphometric. Small tissue fragment from each sample was also analysed for genetic purposes using amplification of mitochondrial control region. Phylogenetic analysis was then performed using Neighbour-Joining with 1000 bootstrap replication. Genetic distance between individual sequences calculated using Kimura 2-parameter methods. Sequences of Euthynnus affinis (AP012946), Katsuwonis pelamis (KM094133, KM261666, KM094145, KM605252, KM094135), and Petenia splendida (KJ914664) were generated from GenBank database, and added to the phylogenetic analysis for species comparison. Result of morphological identification is showed that the larvae having 37 to 42 myomeres, preopercular spine developed, moderate in depth, moderate to large head and eyes identified as a tuna larva (Thunnini). However, this morphological data is not supported by genetic result, which indicated that the samples were identified as K. pelamis, E. affinis, and P. splendida. The intraspecific pairwise genetic distance for each species of K. pelamis, E. affinis, and P. splendida is 4.4 %; 0.5 %; and 22.3%, respectively. Meanwhile, the average pairwise genetic distance between the three species ranges from 16.2% to 33.3%.

Keywords
Tuna larva, Morphological identification, Genetic identification

Topic
Marine Resources, Conversation and ICZM

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

Corresponding Author
Masahiro Mikuriya

Institutions
Kwansei Gakuin University and Shimane University

Abstract
Organic chelate ligands are useful to develop metal-organic systems. Especially N,N,S-tridentate thiolic ligands have a great affinity for many kinds of metal ions to form various metal complexes from mononuclear to polynuclear species. On the other hand, the corresponding N,N,O-tridentate alcholic ligands form dinuclear CuII species exclusively. We focused on these systems in the hope of obtaining new feature of metal thiolates, elucidating interesting crystal structures and spectral properties, although most thiolato complexes are diamagnetic. We obtained mononuclear and trinuclear CoIII species with 2-[(3-aminopropyl)amino]ethanethiol. The CoIII species reacted with oxygen to form the corresponding sulfinato CoIII species. Their conversion was monitored by UV-vis spectra and DFT calculations were performed for the thiolate and sulfinato complexes. We also obtained molybdenum complexes. We will discuss these features based on the crystal structures.

Keywords
metal complexes, thiolic ligand, cobalt complexes, molybdenum complexes

Topic
DV-Xa Method

Link: https://ifory.id/abstract/4C9vF7GVQPfe

Corresponding Author
ILYAS SUHARTO SITORUS

Institutions
a)Student of Doctoral Education Management atUniversitas Negeri Medan
*)tyasitor[at]gmail.com
b)Lecturer at Universitas Negeri Medan
c)Lecturer at Universitas Negeri Medan

Abstract
Abstract. The purpose of this study is to find, and obtain data that can provide information about the implementation of free education policies in Medan 1 Public Middle School using the theory of public policy by Syaiful Sagala, and find out the obstacles faced in implementing the Education Policy Free 2017/2018 school year. This study uses descriptive qualitative research. The main data sources are words and actions. Sampling in this research is Purposive Sampling and data collection using is observation, interview, and documentation. Using informant triangulation and review techniques to ensure data validity. Based on the data analysis and the discussion that has been conducted, the results of the study show that it has taken; the implementation of free education policies in Medan 1 Public Middle School has gone well where, 1) BOS funds received by schools have been used properly, namely for funding education, especially school operational costs. All students, especially those who are less able to carry out their learning activities cheaply and easily, that is, they do not have to pay fees managed by the school, for example tuition fees, development money, registration fees, and book money or can be said free of charge. While for non-operational costs it is still the responsibility of the parents of students. 2) Constraints faced in the Implementation of the Free Education Policy at Medan State Middle School I of the 2017/2018 Academic Year are; the complexity in preparing the accountability report, the delay in disbursing funds is the lack of certainty on the date or time of disbursing funds, decreasing education services especially extracurricular activities, assuming that the public with the free education policy is completely free.

Keywords
Keywords - Policy, Implementation, Free Education, BOS Funds

Topic
Educational Policy and Administration Education

Link: https://ifory.id/abstract/EeW3x7MHqmgt

Corresponding Author
Sukirman -

Institutions
Students of Doctoral Program of Legal Sciences University of Borobudur

Abstract
This research aims to analyze legal protection for cosmetics consumer towards cosmetics circulation containing dangerous substance, and the responsibility of businessmen towards cosmetics products which harms consumers. The research method used in this study is sociological juridical approach, which is based on the legal approach that applies; from both laws and other laws and regulations and is also associated with the facts existed in society. The collected data will then be analyzed in accordance with the Law No.8 of 1999 concerning consumer protection, Law No. 36 of 2009 concerning Health, Indonesian Civil Code specifically the article 1365, 1366, 1367, and Government Regulation No.72 of 1998 concerning Pharmacy, and also the Decree of The Head of Indonesia National Agency of Drug and Food Control. The businessmen who produce cosmetics have to ensure that the products they produce is safe for consumption, is guaranteed, and qualified. Therefore, if there is any products causing harm to consumer, then the businessmen must be fully responsible for the burden of losses or harm suffered by the consumer. The responsibility from the businessmen can be in the form of compensation; can be in the form of refunds or replacement of goods of similar or equivalent value; health care; and/or appropriate compensation. Whereas, sanctions can be in the form of administrative sanctions up to criminal sanctions in accordance with applicable laws and regulations.

Keywords
legal protection, consumers, dangeours cosmetics.

Topic
Administratif Law

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

Corresponding Author
Dandun Mahesa Prabowoputra

Institutions
1.Department of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
2.Graduate School of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
3. Interdisciplinary Program of Marine Convergence Design, Pukyong National University, Busan 48513, South Korea

Abstract
Environmental risk due to excessive residual emission from fossil-based fuel on transportation engine and industrial process is rising as market rivalry becomes intensive between superpower countries. Greenhouse effect, ice melting in Arctic, reduction of air quality are several of main concerns which need immidiate development and change. Energy harvesting equipment is one of the key solutions. environment potential, e.g. Water resource can be collaborated with mechanical equipment to harvest clean energy. Savonius water turbine has been proposed and studied for this purpose and can be placed on several water resources. Still, real-world implementation of this technology is lack, especially in tropical archipelago countries which have abundant water resource. In this work, assessment of savonius water turbine as instrument to harvest clean energy is conducted. Reduction of air pollution is estimated in order to provide environmental signification as affected by savonius in producing alternative clean energy.

Keywords
savonius water turbine, water resource and flow, geographical area, non-fossil energy, emission reduction

Topic
Mechanical Engineering

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

Corresponding Author
Caesario Isak Cornelis

Institutions
a) Department of Industrial Engineering
Universitas Indonesia
Depok, Indonesia
caesarioisak[at]gmail.com
b) Department of Industrial Engineering
Universitas Indonesia
Depok, Indonesia
Farizal[at]eng.ui.ac.id

Abstract
Natural gas as source of energy is more desirable than other fosil fuel such as coal and oil because of environmental advantage. A big issue comes from the decision of new power plant, whether using natural gas or coal as source of energy. In area such as South East Asia, natural gas prices is higher than coal, hindering such uses. In order to make natural gas power plant more viable, some steps must be taken, such as optimization. This study will optimize the location of 5 power plant and pipeline route between 11 location and 2 natural gas sources, so the weighted length is minimum. Thus, a mathematical model developed to solve the problem, which is a Mixed Integer Nonlinear Problem (MINLP). Two step optimization used to obtain solution. The first step is used to obtaion optimal location and pipeline route, the second step is used to obtain optimal pipeline diameter and compressor configuration. A weighting element added to the pipeline length to accomodate the difference of pipeline diameter. Six scenarios are made in this study to give a different location and routing possibility regarding possible future scenarios.

Keywords
Optimization, Natural Gas, MINLP, Location Selection

Topic
Industrial Engineering

Link: https://ifory.id/abstract/jPCx8cRwKGQT

Corresponding Author
Renanto Pandu Wirawan

Institutions
Department of Industrial Engineering, Universitas Indonesia, Depok, 16424, Indonesia

Abstract
Indonesia is one of the biggest plastic waste production in the world. The government targets to reach 20% for recycling plastic waste in 2019. One alternative to manage plastic waste is using pyrolysis to produce fuel. Pyrolysis is used to degrade the plastic long chain of polymer molecules into smaller molecules. All type of plastic except polyvinyl chloride (PVC) were used in this study to produce fuel. For the purpose, experiment factorial design was used for the optimisation plastic type, residence time, and temperature to maximise the yield of liquid products of the pyrolysis process. In this study 2k factorial design was used for each factor. The result shows that the pyrolysis process used is able to produce diesel like fuel in low temperature.

Keywords
Pyrolysis; Plastic waste; Fuel; Design of Experiment; Factorial Design

Topic
Industrial Engineering

Link: https://ifory.id/abstract/TqM6mRVfvB4u

Corresponding Author
Amalia Sholehah

Institutions
1 Advanced Material and Tomography Laboratory, Universitas Sultan Ageng Tirtayasa, Jl. Jenderal Sudirman Km 3 Cilegon, Banten – Indonesia 42435

2 Department of Metallurgical Engineering, Faculty of Engineering, Universitas Sultan Ageng Tirtayasa, Jl. Jenderal Sudirman Km 3 Cilegon, Banten – Indonesia 42435

3 Center of Non-Destructive Testing and Process Imaging, CTech Laboratories, EdWar Technology, Jl. Sutera Kavling Spektra Blok 23 BC No 10 – 12, Tangerang Selatan, Banten – Indonesia 15325

4 Department of Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus Baru Universitas Indonesia, Depok, Jawa Barat – Indonesia 16424

5 Departement of Engineering Physics, Faculty of Industrial Technology, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung, Jawa Barat – Indonesia 41032

Abstract
Capacitive sensor works based on capacitive methods and serves to detect changes in the composition of dielectric materials by determining the capacitance value and dielectric constant. This type of sensor has advantages in convenient manufacturing process, a simple working mechanism, as well as extensive applications in various fields. In this study, capacitive sensors were used to characterize the electrical properties of materials that have several structures. The dielectric material samples used are bulk ZnO with particle (spherical) structure, ZnO synthesized by chemical bath deposition method (CBD) which has a rod structure, and synthetic ZnO results through a vapor phase method with tetrapod structure. The sensors were made by a parallel plate method using two copper plates as capacitors. The sensors were designed in 2x2 cm and 2x4 cm size, with the distance between the electrodes being 1 and 2 mm. The results showed that capacitive sensors proved to be able to distinguish capacitance values and electrical permittivity of ZnO with different structures. From the experiment, it was known that ZnO with a rod structure synthesized through the CBD method gave the highest capacitance and electrical permittivity values compared to other ZnO samples.

Keywords
ZnO, capacitive sensor, capacitance, permitivity

Topic
Materials Science

Link: https://ifory.id/abstract/qCm7Er2pz9UD

Corresponding Author
Yustia Wulandari Mirzayanti

Institutions
1) Department of Chemical Engineering, Industrial Technology Faculty, Institute Technology of
Sepuluh Nopember, Surabaya, Indonesia, 60111.

2) Department of Industrial Chemical Engineering, Vocational Faculty, Institute Technology of
Sepuluh Nopember, Surabaya, Indonesia, 60111.

3)Chemical Engineering, Faculty of Industrial Technology, Institute Technology of Adhi Tama
Surabaya, Indonesia.

Abstract
The conversion of Ceiba pentandra oil to catalytic hydrocracking are suitable ways for biofuel. The focus of this study is to use Ceiba Pentandra oil catalytic hydrocarbon cracking and determine the alternative to petroleum fuels. The conversion of the Ceiba pentandra oil was carried out using a slurry pressure batch reactor, type 4563 PARR with a volume of 200 ml. This conversion process is done by varying the temperature factor (300-400oC), the reaction time over the range of 30-120 minutes and hydrogen pressure over a range of 30 bars using NiMo/HZSM-5. The conditions for the highest conversion of gasoil (C15-C18) as much as 43.78% were temperature of 400 minutes. The same conditions for kerosene (C9-C14) and long hydrocarbon chains (>C18) were present at 4.93% and 2.85% respectively. The kinetic study was determined to determine the order and kinetic parameters of activation energy (Ea) of 84,266 kJ.kgmol-1K-1 and the exponential factor from Arrhenius relationship. The order of this reaction has been determined of first order and the kinetic model is defined as -r_Tg=0.0157C_Tg. Ceiba pentandra oil triglycerides hydroconversion pathways were dependent on temperature and reaction time. The triglycerides could be hydrocracked to lower range hydrocarbons (C9-C14) by increasing the reaction temperatures.

Keywords
triglyceride conversion, catalytic hydrocracking, kinetic, NiMo/HZSM-5,biofuel

Topic
Chemical Engineering

Link: https://ifory.id/abstract/aU7QeGHZKJvu

Corresponding Author
Agus Putu Abiyasa

Institutions
Universitas Pendidikan Nasional

Abstract
We report a design for optimum humidity and temperature control system based on a low cost open source Arduino Microcontroller. The system is implemented in a 20 kV high voltage cubicle compartment for Lokomboro Microhydro Power Plant at Sumba, Indonesia. Due to high water vapor, humidity inside the cubicle is very high (>70%) creating plasma arching and destroying the cubicle. By installing blower and heater coupled with humidity and temperature sensors, we manage to prevent the arching by removing the excess water vapor. With automatic control, manual checking has been reduced to twice a year. Furthermore, blower and heater operation time has also been reduced to 14 hours a day. Therefore, the Lokomboro Microhydro Power Plant has operated with minimum maintenance cost and longer cubicle lifetime.

Keywords
Microhydro power plant, Plasma arching, Arduino microcontroller

Topic
Electrical Engineering

Link: https://ifory.id/abstract/hbkeTQq4Udxn