Indonesia Conference Directory

Corresponding Author
Wahyu Rafdinal

Institutions
a) Politeknik Negeri Bandung
wahyu.rafdinal[at]polban.ac.id
b) Politeknik Negeri Bandung
eko.susanto[at]polban.ac.id
c) Politeknik Negeri Bandung
mohammad.rizal[at]polban.ac.id

Abstract
The rapid development of online games makes online games very popular. This study aims to analyse the factors that make a person addicted to playing online games. This research analyses game features and social perspectives that influence online game addiction. Respondents in this study are online game players in Indonesia who play online games more than 21 hours a week with 150 respondents. The analysis technique used is PLS-SEM. The results showed that game features had a significant effect on game addiction. Social factors such as network convergence, interdependence, sense of community, relational switching cost contributed to game addiction. This research can be information on the factors that influence game addiction.

Keywords
game addiction, game features, social perspectives

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/B7aYxTZWePpL

Corresponding Author
ANDI TAUFAN BAYU

Institutions
STATE UNIVERSITY OF JAKARTA

Abstract
Abstract Focus on the main concern in the game of badminton is the smash skill, in this case it is the skill in doing the smash badminton. As for the training method used is a method of exercise drill. Based on the study of the problems to be studied and goal to be achieved, then the form used in this study is a form of experimentation. As for the design that will be used is the design of a factorial design 2x3. As for the sample in this study was obtained from the number of the reachable population, namely students who have attended courses badminton as much as 2 classes totaling 70 students. Based on the results of the data, 34.33% or 10 people obtained scores of badminton smash skills training for students who were trained with drill exercises above the average, 16.66% or as many as 5 people were on average, and 49.99% or as many as 15 people is below average. Then obtained 26.66% or as many as 8 people who obtained the score of the results of badminton smash skills training for groups of high ankle coordination students who were trained with drill training methods above the average, 6.66% or as many as 2 people were on average, and 33.33% or as many as 5 people are below the average. Overall, there are significant differences from the results of the skills training smash badminton between group of students who trained with the method of exercise drill low and high. The results of the skills training smash badminton for a group of students who have eye coordination foot high who trained with the method of exercise drill is better compared with the group of students who have eye coordination foot low which is trained by the method of exercise drill.

Keywords
Smash, The Drill , Eye Coordination Foot, Experiment

Topic
Sport and Empowering Disability

Link: https://ifory.id/abstract/EQuM9gtXaYLd

Corresponding Author
Azi Faiz Ridlo

Institutions
Universitas Islam 45 Bekasi

Abstract
This study aims to determine the effect of angle hop and squat jump exercises on leg power in Futsal Extracurricular participants at Al-Azhar 18 Grand Wisata High School. The method used in conducting this research is an experimental method with a purposive sampling technique. The sample in this study amounted to 12 people from a total population of 21 people. Based on the results of research and data analysis, it can be concluded that: (1) training angle hop has a significant effect on leg power (2) training squat jump has a significant effect on leg power. (3) There is no difference in the effect of exercises angle hop and squat jump on leg power.

Keywords
angle hop, squat jump, leg power

Topic
Community Sport Development (CSD)

Link: https://ifory.id/abstract/nAHeu3XQvrZh

Corresponding Author
Aridhotul Haqiyah

Institutions
Universitas Islam 45 Bekasi

Abstract
The purpose of this study is to find out how the quality of pedagogical and professional competence of physical education teachers at the Senior High School in Cengkareng District, West Jakarta City in 2019. This research is a descriptive study with a survey method. The instrument used was a questionnaire and observation based on the Minister of National Education Regulation No. 16 of 2007. The population and sample in this study were 5 Deputy Principals in the Field of Curriculum of Senior High Schools in the City of Cengkareng, West Jakarta City. Based on the results of the study, it can be concluded that: (1) pedagogical competencies are in the moderate category (55.56%) with an average value of 105.5, and (2) professional competencies are in the moderate category (66.67%) with an average of 61.56%.

Keywords
pedagogical competence, professional competence, physical education, survey

Topic
Critical Issue on Gender and Sport Development in Indonesia

Link: https://ifory.id/abstract/nRN7Ltqj96hd

Corresponding Author
Dindin Abidin

Institutions
Universitas Islam 45 Bekasi

Abstract
Agility and balance are important in the speed of dribbling in soccer for the student. The main of the research was to identify a level of quantitative changes of the dribbling speed with fifteen years old football players under the influence of the agility and balance. This research method is associative descriptive with regression analysis techniques. The population of this study was all students in the Cigudeg Soccer School amount of 130 people. The sample in this study amounted to 30 people with a purposive sampling technique (Age ± 13-15 years old). Based on the results of research and data analysis, it can be concluded that: (1) Agility affects the speed of dribbling in soccer, (2) Balance has a significant effect on the speed of dribbling in soccer, (3) Simultaneously agility and balance significantly influence the speed of dribbling. Thus agility and balance can be a priority in practicing speed of dribbling in soccer.

Keywords
Agility, Balance, Speed of Dribbling, Soccer

Topic
Community Sport Development (CSD)

Link: https://ifory.id/abstract/97LEW8vyRxtc

Corresponding Author
Tatang Iskandar

Institutions
Universitas Islam 45 Bekasi

Abstract
This study aims to improve the learning outcome of passing basic motion by using the sidefoot inn the football games through blocking game media. In the first cycle of the research, the percentage of students who were able to complete the passing learning outcome reached 70% or 28 students. This percentage is an increase from the percentage of students learning achievement at the initial observation stage which only reached 30% or 12 students. Then in the second cycle of the research, the increase in student passing learning outcome increased significantly up to 80% of the number of grade IVA students in Lawanggintung 2 State Elementary School, Bogor City or 32 students who have been able to achieve the predetermined minimum completeness criteria of 75. Therefore, it can be concluded that through the blocking game media in football game, it has proven to be effective in improving the learning outcomes of passing, football, and blocking.

Keywords
Passing, Football Game and blocking game media

Topic
Community Sport Development (CSD)

Link: https://ifory.id/abstract/RZHzgWBytr6q

Corresponding Author
Fauzul Adzim

Institutions
a) Economics of Development Department, Economics Faculty, Universitas Negeri Semarang

b) Master of Economics and Development Studies, Economics Faculty, Universitas Diponegoro
*fauzuladzim58[at]gmail.com

Abstract
This study aimed at determining and analyzing the amount of willingness to pay and factors influencing the amount of willingness to pay to repair environmental damage in Kampung Batik Semarang. This study was a quantitative research, and used primary and secondary data. Meanwhile, the method of analysis used by the researchers to calculate the willingness to pay was CVM (Contingent Valuarion Method) approach. It aimed at obtaining the cost paid by respondents in this study. Then, multiple linear regression with Ordinary Least Square (OLS) method was employed to determine factors influencing WTP values of the Batik craftsmen in Kampung Batik Semarang. The results showed that the average of Willingness To Pay (WTP) of batik craftsmen in Kampung Batik Semarang was Rp. 5,413. Meanwhile the total / aggregate value of WTP in this study amounted to Rp 135,570 per month. Based on the results of multiple linear regression analysis, the variables of income and number of family dependents had a significant influence on the value of WTP. On the other hand, the variables of age and education did not have a significant influence on the value of WTP.

Keywords
Willingness To Pay, Batik, Semarang

Topic
Environment, Health, and Safety

Link: https://ifory.id/abstract/q79RdrWvh4aV

Corresponding Author
GANDA ADI SEPTIYAWAN

Institutions
1. Animal Husbandry Study Program, Animal Science Faculty of Hasanuddin University
2. Laboratory of Animal Breeding and Genetic, Animal Science Faculty of Hasanuddin University

Abstract
Utilization of local goats in Indonesia with good genetic potential, cannot be characterized and utilized optimally causing the population to be endangered. The Marica goat is one of Indonesias endemic goats found in the provinces of South Sulawesi including Maros and Jeneponto. The Marica Goat is currently difficult to find and the estimated population is unknown. For the interest of conservation of Marica goats as native goats of South Sulawesi, information is needed about the character or morphology of the Marica goats, which focus in Maros and Jeneponto. Research material is Marica goat and Kacang goat with a minimum age of T2 (2-3 years). The data obtained were processed descriptive, calculated average values, standard deviation values, coefficient of variation values, and analyzed in correlation and cumulative index calculated. The results of the quantitative traits identification of Marica goats have smaller body measurement compared to Kacang goats. Marica goats and Kacang goats have a percentage coefficient of variation that has a high level of homogeneity (CV <20%).

Keywords
Local Goat, Marica Goat, Quantitative Traits.

Topic
Breeding and livestock production

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

Corresponding Author
Fitriani R

Institutions
Department of Agribusiness, Faculty of Science and Technology, University of Muhammadiyah Sidenreng Rappang, Jl. Angkatan 45 No. 1A. Lt. Salo, Sidrap-91651, South Sulawesi.
Animal Husbandry Study Program , Animal Science Faculty, Hasanuddin University

Abstract
Increased grain production is strongly influenced by the irrigation system owned by farmers. With optimal irrigation system then the farmer will dare to buy more expensive seeds. Farmers will be willing to take greater risks because of grain production to be acquired greater. According to the Data Collection Guidelines for Food Crops and Horticulture, BPS - Ministry of Agriculture in 1993, several factors can affect the rise and fall of the average rice production per hectare is the problem of soil fertility, use of fertilizers, seeds, how to grow crops, pests and so on [2]. The purpose of this study to determine the effect of agricultural systems on seed selection in Sidrap. This study was conducted in 11 districts in Sidrap, using 99 samples. To answer the purposes of this study, the research institute using logistic regression data analysis is an approach to create predictive models such as linear regression, or commonly referred to as Ordinary Least Squares (OLS) regression. Y = B0 + B1X + e. Where e is the error variance or residual. The results showed that a good irrigation system such as the system of irrigation the farmers are more willing to take the risk to buy seed expensive that have good quality, unlike the case with rainfed and pumping which tends to farmers choose to use seed that relatively cheaper, because farmers do not dare to take the risk of failure of grain production because irrigation systems are less supportive.

Keywords
irrigation system, prices, production

Topic
Extension of agriculture

Link: https://ifory.id/abstract/6V2yKtgHwWpF

Corresponding Author
Mutmainnah Adenan

Institutions
a) Faculty of Cultural Science, Halu Oleo University
b) Faculty of Cultural Science, Halu Oleo University
c) Faculty of Cultural Science, Halu Oleo University

Abstract
Slip of the Pen as A Psychopathology of Everyday Life on Wilde-s Happy Prince and Other Tales Abstract Oscar Wilde is recognized for his tragedy and supernatural short stories as one of his astonishing works, the black cat, still discussed in this very modern days. In 1888, Wilde then succeeds to made a move of his work by published a collection of his work entitled The Happy Prince and Other Tales. The collection consists of seven stories; The Happy Prince, The Nightingale and The Rose, The Selfish Giant, The Devoted Friend, The Remarkable Rocket, The Sphinx Without A Secret, and The Birthday of The Infanta. Considering seven works in one collection, it is possible that Wilde himself did a slip of the pen among his seven works in a collection. This study aims to find the slip of the pen in Wilde-s collection The Happy Prince and Other Tales, and also to analyze the construction and effect of Wilde- slip of the pen through his collection as well. In analyzing the occurrence of the slip of the pen, this study will use the psychopathology of everyday life, one of the remarkable theories by Freud. In psychopathology of everyday life, slip of the pen alone has kinds of various types and symptoms where this study would also determine the suit kind of slip of the pen in Wilde-s The Happy Prince and Other Tales.

Keywords
short story, slip of the pen, psychopathology of everyday life, Oscar Wilde

Topic
Literarture

Link: https://ifory.id/abstract/GQLmaWM6uYz9

Corresponding Author
Abdulxak Khalikov

Institutions
Tashkent Institute of Railway Enginering

Abstract
Introduction. Objective reasons are necessary for the birth of new theories and new ideas in science. If in some field of knowledge we would have, for example, an ideal theory that would answer absolutely all questions, then hardly anyone would have the desire to change this theory, somehow complement and improve it [1]. If we turn to the modern theory of electromagnetism as a concrete scientific theory, then this theory is completely permeated with all sorts of contradictions and paradoxes. Some paradoxes have their own names: “paradoxes of unipolar induction”, “secrets of unipolar induction”, “paradox of unipolar motor”, “paradox of rail motors,” “paradox of Goering”, “paradoxes of transformer” [5]. Up to now, almost no serious attempts have been made to change or supplement the well-known theory of electromagnetism. The reason for this was not only the contradictions and paradoxes of electromagnetic theory, but also the abstract mathematical formalism applied by Maxwell to describe various electromagnetic phenomena through electric and magnetic fields. Over time, the positive advantages of electromagnetic theory, which, undoubtedly, were, overshadowed its shortcomings and weaknesses. Contradictions and paradoxes in the theory began to be considered as only strange and harmless exceptions in the harmonious theory [1]. Mathematization of the theory played a significant role. The consequence of excessive mathematization of this theory turned the electromagnetic theory from the physical to the mathematical one. The theory of motion in time, the energy of rotation is in many ways similar to Einsteins theory of relativity. In fact, this theory of relativity has a dual character. The first peak of the theory is the peak of human knowledge; the second is the theory of movement in time. In this case, it is not necessary to know this theory, since the theory of motion in time allows you to look at the theory of relativity from the new side and makes it simple and clear [4]. The theory of movement in time is an effective tool for the knowledge of nature. The theory of motion is inextricably linked with the gravitational field. The non-explosive part of electrodynamics and gravity leads to the creation of a single spatial field, which Einstein dreamed of. The aim of the work is to combine all the fields: electric, magnetic, electromagnetic into a single electromagnetic theory of the spatial field. With the help of a single spatial electromagnetic field, such phenomena as the production of fine materials that cannot be obtained by any separators, and if possible, only with a large amount of electricity, are easily explained. Recently, more and more attention has been attracted to research in the field of nanomaterials and nanotechnologies, where they work with objects whose dimensions are commensurate with the correlation radius of a physical phenomenon

Keywords
Unified spatial electromagnetic field, electric, magnetic, gravitational, wave equations.

Topic
Bioenergy

Link: https://ifory.id/abstract/hTf72CVUn9j8

Corresponding Author
Ida Bagus Wayan Gunam

Institutions
a) Agroindustrial Technology Dept. Faculty of Agricultural Technology, Udayana University, Badung, Bali 80361, INDONESIA
* ibwgunam[at]unud.ac.id

b) Agricultural Engineering Dept. Faculty of Agricultural Technology Udayana University, Badung, Bali 80361, INDONESIA.

Abstract
The purpose of this study was to obtain a new strain of cellulolytic bacteria that could degrade lignocellulose waste as one of the abundant biomass into simple sugars such as glucose. Soil samples were taken from several locations in Bali and isolated using carboxymethyl cellulose (CMC)-enriched media. Screening was carried out with Congo red-polysaccharide interactions test, degradation of filter paper test and cellulase activity test. One hundred and twenty-three isolates of cellulose-degrading bacteria were isolated, able to grow and utilize cellulose as a carbon source. However, only 45 isolates produced clear zones with the Congo red test and the cellulolytic index ranging from 1.43 to 7.76 mm. Three isolates from the seven potential isolates that have the largest clear zone were proceed to the next stage of testing. The Isolates of B2S8, G14 and G22 have the highest activity of CMCase and FPase. B2S8 bacterial isolate has the highest ability to degrade cellulose on Whatman paper no. 1 was 9.82%, followed by G14, and G22 isolates which were 7.03%, and 2.94% respectively. Those with the highest CMCase activity were isolates B2S8 followed by G22 and G14, namely: 0.075, 0,074, 0.072 IU/mL respectively. While the highest exoglucanase activity was G1-4 isolate (0.112 IU/mL), followed by B2S8 and G-22, namely: 0.072 IU/mL and 0.072 IU/mL, respectively.

Keywords
Lignocellulose; Isolation; Cellulolytic bacteria; Cellulase activity

Topic
Bioenergy

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

Corresponding Author
PRINCE CHARLES HESTON RUNTUNUWU

Institutions
Faculty Of Economy and Business
University of Khairun, Ternate, North Maluku

Abstract
This study aims to examine and analyze: (i) the impact of private investment and education expenditure, on economic growth districts/municipalities in North Sulawesi province in the first model, (ii) the impact of economic growth, inequality of economy growth dan number of population to poverty level in 11 regencies and 4 cities in North Sulawesi Province period 2010 - 2015. Research using simultan dynamic panel data regression method. This study was conducted in North Sulawesi Province has 11 districts, Minahasa, Sangihe, Talaud Islands, South Minahasa, North Minahasa, Southeast Minahasa, Bolaang Mongondow, Bolaang Mongondow North, Bolaang Mongondow South, Bolaang Mongondow East, Sitaro and 4 cities of Manado, Bitung, Tomohon and Kotamobagu. The results of the first model study show different effects and vary according to each variable. Private investment has a significant effect on economic growth. Which implies that an increase in private investment can increase economic growth. Education expenditure has a significant effect on economic growth. Which implies that the increase in education spending leads to an increase in economic growth. The results of the second model study show that economic growth has significant effect on poverty level in regencies/cities in North Sulawesi Province. Which means that an increase in economic growth could have an impact on the rise in poverty levels. Population has significant effect to poverty level. Negative relationship means that an increase in the number of people can reduce poverty.

Keywords
Economic Growth, Poverty Level, Simultaneous Dynamic Panel Data

Topic
Regional Economics

Link: https://ifory.id/abstract/fAFW3hLjNbMK

Corresponding Author
Sri Hartati

Institutions
1)Study Program of Agricultural Product Technology, Faculty of Agricultural, Universitas Veteran Bangun Nusantara Sukoharjo, Jl. Letjend S. Humardani No. 1 Sukoharjo 57521

2)Faculty of Agricultural Product Technology Universitas 17 Agustus 1945 Semarang.

Abstract
Rice bran is known having bioactive antioxidant compounds that are hydrophilic and lipophilic. Rice bran extraction on hydrophilic bioactive compounds need to be optimized. This study aims to determine the impact of hydrolysis and non-hydrolysis treatments to bran as well as the solvent type on the antioxidant activity of hydrophilic bioactive compounds in bran extract. The study was conducted by varying the treatment of bran extraction to obtain the best hydrophilic extract. Variation in treatments include with or without hydrolyzing rice brans. In addition, there were variations on the solvent type to dissolve the hydrophilic bioactive compounds by using 96% of ethanol and ethyl acetate. Parameters of the observation consist of yield, total phenol and antioxidant activity scavenging free radicals (DPPH). The results showed that the treatment of hydrolyzed and un hydrolyzed rice brans and the solvent type provided a significant difference to the yield, total phenol and antioxidant activity of hydrophilic bioactive compounds from rice bran. The highest yield (1.72%), total phenol (12.37 mg EAG/g) and antioxidant activity (68.74%) were resulted from the bran treatment without hydrolysis and using ethanol as the solvent type. Extraction of hydrophilic bioactive compounds can be done by using a method without hydrolyzing the rice brand and using ethanol as the solvent.

Keywords
rice bran, bioactive compound, antioxidant, hydrophilic extract

Topic
Agricultural Engineering

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

Corresponding Author
Andi Safriani

Institutions
Fakultas Syariah dan Hukum UIN Alauddin Makassar

Abstract
Sovereignty is in the hands of the people and implemented according to the 1945 Constitution.the meaning of people-s sovereignty in the 1945 Constitution is to place the people as a source of state power where it is in line with the understanding of democracy, namely from the people,by the people and for the people. The regional head election is a form of people-s sovereignty. The existence of a blank coulumn in the regional head election is seen as an alternative choice of the people which simultaneously allow regional head election to be held with only one pair of candidates. Such conditions occur because of the absence of other options provided by the party organizing the regional head election. The research is a qualitative research by describing or giving or giving a description of the condition factually and systematically about the facts and phenomena related to the problem under study and usinh the method conceptual approach and statute approach. The result showed that there were legal problems that occurred when the regional head election was carried out using a blank column selection system.therefore, there is a need for a regulation regarding the mechanism for the selection of regional heads in a complete and clear manner so that it becomes a reference for the regional head election organizer.

Keywords
The rules, Regional Head election, Empty Column System.

Topic
Democracy, Constitution, and Globalization

Link: https://ifory.id/abstract/GFk2pmQj4xNP

Corresponding Author
Mohammad Bekti Hendrie Anto

Institutions
Department of Economics, Universitas Islam Indonesia, Yogyakarta, Indonesia

Abstract
Islamic banking as a financial intermediary is very vulnerable to bankruptcy. One measure of bankruptcy is non-performing financing (NFP). Indonesian Islamic bank consists of Islamic commercial bank and Islamic rural bank. The NPF level of Islamic rural banks is above the maximum threshold. This paper investigates the impact of bank characteristic variables such as assets, financing, CAR, and efficiency and macroeconomic variables such as national output and inflation on NPF. The results show that assets, CAR, and efficiency have a positive effect on NPF while financing has a negative effect on NPF. The domestic output has a negative effect on NFP and the inflation has a positive effect on the NPF. More interestingly, the effect of macro variables is asymmetric on NPF. An increase in output does not decrease the NPF but when a decrease in output raises the NPF. Whereas the inflation worsens the NPF compared to the deflation

Keywords
Non Performing Financing, Islamic rural bank, NARDL, Indonesia

Topic
Islamic Economics and Business

Link: https://ifory.id/abstract/V8yqnTECFWUm

Corresponding Author
Laurentius Dominggus Gadi Djou

Institutions
a. Department of accounting, faculty of Economics, University of Flores.
b. Department of Magister Management, STIE Bank BPD Jateng

Abstract
The purpose of this study was to examine and analyze the effect of competence and locus of control on the performance of government internal auditors with job satisfaction as an intervening variable. This research is an explanatory research with a quantitative approach. The sample in this study were all internal auditors at the Ende Regency Inspectorate Office. The collection of data and information needed in this study was carried out by field research. The data used are primary data, obtained directly from research subjects in the form of respondents perceptions in the form of questionnaires to 37 respondents. The analytical tool used is path analysis and mediation test with Sobel test. The results of data testing showed that the competency variable had a significant positive effect on job satisfaction and internal auditor performance. Locus of control has a positive and significant effect on job satisfaction and internal auditor performance. Job satisfaction has a positive and significant effect on the performance of internal auditors and is also able to mediate the relationship between competence and internal auditor performance; as well as being able to mediate the relationship between the locus of control and the performance of internal auditors.

Keywords
competence, locus of control, job satisfaction, government internal auditors performance

Topic
Finance and Accounting

Link: https://ifory.id/abstract/fmpxL37yuqn4

Corresponding Author
Rosa Delima Ekwantini

Institutions
Poltekkes Kemenkes Yogyakarta

Abstract
Post-spinal anesthesia hypotension is the most common incident, approximately 15 - 33% with each spinal anesthetic injection (Mercier et al., 2013).Post – spinal anesthesia hypotension was influenced by several factors, there were sympathetic block nerve height, patient position, Body Mass Index, length of operation, prehydration fluid, location of stabbing, and used of vasopressor. The aim of study to investigated the factors that most influence of hypotension in patients with spinal anesthesia.This retrospective study was carried out 80 medical records with purposive sampling at Soeradji Tirtonegoro Hospital Klaten, Center of Java. The data collected includes symphatetic block nerve height, patient position, Body Mass Index, length of operation, prehydration fluid, location of stabbing, and used of vasopressor. Data were analyzed using Chi-Square test and Logistic Regression test. Incidence of hipotension in patient with spinal anesthesia was 56.25%. Factors influencing hypotension were sympathetic block height (OR = 3.391; 95% CI = 1.121-10.262), BMI (OR = 4,166; 95% CI = 1,625-10,676), prehydrated fluid (OR = 0.339; 95% CI = 0.135 -0,850), location of stabbing (OR = 0,136; CI 95% = 0,016-1,145) and use of vasopressors (OR = 0,303; CI 95% = 0,116-0,789) with p <0,05, while position factors and duration of operation have no effect . The factors that most influenced incidence of hypotension in patients with spinal anesthesia are prehydration fluids with a significance value of 0.002 and Exp (B) 8.221. Factors that influence the incidence of hypotension in patients with spinal anesthesia were namely sympathetic block height, BMI, prehydration fluid, location of stabbing, and use of vasopressors.

Keywords
Spinal Anesthesia, Hypotension, Influence Factors

Topic
COMMUNICABLE AND NON COMMUNICABLE DISEASES

Link: https://ifory.id/abstract/Yfw2bAzun7EL

Corresponding Author
Muhammad Mufid Mas-ud

Institutions
UNS

Abstract
Porous silicon has been fabricated by photolithography and Reactive Ion Etching with various etching times in the previous study. The PSi surfaces have the pore size in the range of for PSi and 17.4 to 37.7 nm for PSi 100. Meanwhile, the PSi has the resistivity around 1.14 to 2.60 10 min4 &

Keywords
porous silicon, photolithography, reactive ion etching, resistivity, reflectance.

Topic
Smart materials

Link: https://ifory.id/abstract/LyNY6zW42G3v

Corresponding Author
Amin Kadafi

Institutions
Manajemen, FEB, Universitas Mulawarman

Abstract
The food and beverage industry in Indonesia has an important role in Indonesias economic growth. The important role of the food and beverage industry can be seen from the large contribution to the gross domestic product (GDP) of the countrys non-oil and gas industry. One important decision in financial management with company operations is the funding decision. A good funding decision in a company can be seen from the capital structure. The optimal capital structure of the company will be able to minimize the cost of capital that must be borne by the company. The purpose of this study was to determine the effect of intellectual capital and firm size and leverage on the cost of equity capital in food and beverage sub-sector companies listed on the Indonesia Stock Exchange.

Keywords
intellectual capital, firm size, leverage, cost of equity capital, food and beverage companies

Topic
Manajemen Keuangan

Link: https://ifory.id/abstract/eNuY4HwUjMbW

Corresponding Author
Irma kartika

Institutions
UM

Abstract
Carboxymethyl kappa-carrageenan (CMKC), is the result of carboxymethylation of kappa-carrageenan. Carboxymethylation of k-carrageenan is carried out in two stages: (1) Alkalization of k-carrageenan using NaOH, to form alkoxy-k-carrageenan, then etherification of alkoxy-k-carrageenan with monochloroacetic acid (MCA) as reactant to produce carboxymethyl k-carrageenan (CMKC). The success of CMKC synthesis can be measured based on the value of the degree of substitution, (DS), DS is the average number of hydroxyl groups that are converted to carboxyl groups. The success of the conversion of hydroxyl groups into carboxyl groups is influenced by several factors, synthesis temperature, types of reactants and the polarity of the reaction medium. This study has been done to analyze the effect of the polarity of the CMKC synthesis reaction medium,to the DS value. k-carrageenan was reacted with NaOH, then the results were reacted with monochloroacetic acid, insome variation proportion of isopropanol-ethanol-acetone, as reaction medium. The value of DS of CMKC that were synthesized was measured by the titrimetric method. The results showed that the polarity of the reaction medium affected the value of DS CMKC. The highest DS value (1,7) was owned by CMKC which was synthesized in the isopropanol-acetone-ethanol (25:3:2) v/v as reaction medium.

Keywords
carboxymethylkappa carrageenan, polarity, degree of substitution

Topic
Biomass, Biofuel

Link: https://ifory.id/abstract/hvBqLrGfE9CH

Corresponding Author
Fitria Yulistiani

Institutions
a) Chemical Engineering Department, Politeknik Negeri Bandung, Kotak Pos 1234, Bandung, 40012, Indonesia
*fitria.yulistiani[at]polban.ac.id
b) Energy Conversion Engineering Department, Politeknik Negeri Bandung, Kotak Pos 1234, Bandung, 40012, Indonesia

Abstract
Biomass gasification technology has been developed in Indonesia in the last 30 years. During those years, this technology has become one of the choices as a decentralized power plant for remote area. However, the use of synthetic gas directly on diesel engine and steam turbine for electricity generation has a relatively low efficiency. On the other hand, synthetic gas can be used as raw material for Fischer Tropsch (FT) process, a process for manufacturing synthetic diesel and gasoline in high temperature. Because of its high temperature, the exhaust heat can still be used for steam power plant. This paper consists of a study for synthetic gas production from corncob-s gasification which then can be used as FT process-s raw material. Product-s economic level is compared with conventional process. Previous studies show that gasifier optimal temperature is between 800 to 1,000oC. Simulation shows that this approach can produce FT fuel (diesel oil equivalent) 58 million litres per year and electricity 400 GWh per year. With raw material capacity of 300,000 tonnes/year, calculated FT fuel production cost is 6,569 IDR/liter and electricity production cost are 245 IDR/kWh (about 22% of PLN-s average tariffs 1,123 IDR/kWh).

Keywords
optimal process; biomass gasification; Fischer Tropsch Synthesis; electric power; fuel

Topic
Chemical Engineering

Link: https://ifory.id/abstract/yf4JwDkqg9Cb

Corresponding Author
Eko Andrijanto

Institutions
Politeknik Negeri Bandung

Abstract
Edible coating such as chitosan was utilized to prevent fruit from ripening and prolong the shelf life. Grapes and tomato were used as samples and treated with chitosan solution at different concentration 1, 2 and 3%. The combination of 3% chitosan solution with polyphenol and ascorbic acid at different concentration were also studied. The polyphenol was extracted from green tea using maceration technique . The fruit samples were analyzed by measuring the color changes of the fruits. The shelf life of the grapes was improved almost 2.5 times longer using 3% chitosan solution compared to the uncoated grapes. The shelf life is increased from 6 days to 16 days. Tomato shelf life was also enhanced using 3 % chitosan solution from 4 days to 15 days for the coated chitosan. The addition of polyphenol and ascorbic acid to the chitosan solution was only slightly prolong the shelf life of the samples although it is not very significant compared to the blank. The results proved that the chitosan treatment to grapes and tomato enhanced their shelf life and this material has potential to be used industrially and it can benefit for farmer.

Keywords
Chitosan, grape, tomato, polyphenol, fruit quality

Topic
Chemical Engineering

Link: https://ifory.id/abstract/eWjvQanFL6q9

Corresponding Author
Yackob Astor

Institutions
a) Department of Geodetic & Geomatica, National Institute of Technology No. 23 PH.H.Mustofa Street, 40124 Bandung, Indonesia.

b*) Marine Cadastre Researcher, Bandung State Polytechnic. Gegerkalong Hilir Street, 40012 Bandung, Indonesia. yackobastor[at]polban.ac.id

c) Department of Civil Engineering, Kaltara University. Tanjung Selor, Bulungan, Kalimantan Utara, Indonesia

Abstract
Sedimentation at coastal city of Cirebon is caused by considerable abration process in Indramayu regency and the impact of sand mining on Gosong Island, Indramayu Regency, beside that, the habit of residents in coastal city of Cirebon who heap up garbage at the coastal for years to utilize the area for residential purpose also contributed significantly the problem of sedimentation in the coastal area of Cirebon City. This research applying remote sensing technology of Landsat 7 2005, 2007, 2010, and 2015 using Lemigas Algorithm to gain information of special and temporal increase of sedimentation, distribution pattern, and density level of sedimentation. The result shows that accretion of sedimentation process between 2005 and 2015 at Lemahwungkuk Subdistrict is 56,989 Ha with a sedimentation rate of 5,699 Ha/year. Kejaksan Subdistrict has increase sedimentation by 16,491 Ha with a sedimentation rate of 1,649 Ha/year. The most significant increase happened at 2010 to 2015, with 46,072 Ha. However, from 2005 to 2010 the sedimentation increased by 5,675 Ha. There are 2 types of distribution pattern at Cirebon City, the first one is the sedimentation that ends in the estuary of river, particularly at Sukalila and Kesunean River deltas. The other type is the sedimentation caused by the presence of longshore currents which carry sediment and stuck on the coast along coastal city of Cirebon. Identification of natural and artificial sedimentation is carried out based on surveys in the field. The Lemigas Algorithm used only for classification of sedimentation (natural and artificial) based on density level of sedimentation content (mg/L).

Keywords
Sedimentation, Lemigas Algorithm

Topic
Environmental Engineering

Link: https://ifory.id/abstract/crZVfn982wtW

Corresponding Author
Rinto Yusriski

Institutions
(a) Department of Industrial Engineering, Faculty of Engineering, Universitas Jenderal Achmad Yani (UNJANI), PO. BOX 807 Bandung Indonesia.
*yusarisaki[at]yahoo.co.id
(b) Department of Mathematics, School of Computer Science, Binus University, Syahdan
Street 9, Jakarta 11480, Indonesia

Abstract
The problem situation can be observed when the capability of several components on a single machine decrease during the scheduling period and need maintenance action. Since the lifetime is variation, that action often interrupts the production process. The solution can be obtained by grouping the maintenance action with determine the number of the group, component on the group, and scheduling the group to the shop. However, that decision must consider the production plan, i.e., the number of the batch, batch size, and schedule the batches. We propose the algorithm to integrate between both of these two problems, so the total actual flow time minimize. The result of experiments shows that the proposed algorithm could increase the performance effectively.

Keywords
group maintenance; batch scheduling; actual flow time

Topic
Industrial Engineering

Link: https://ifory.id/abstract/GuqeKMUfbh3J

Corresponding Author
Maharani Okifitriana

Institutions
a) Department of Civil Engineering, Universitas Indonesia, Depok 16424, Indonesia
maharani.okifitriana[at]gmail.com
b) Department of Civil Engineering, Universitas Indonesia, Depok 16424, Indonesia
yusuflatief73[at]gmail.com

Abstract
Construction is one of the main projects that is stated in the Universitas Indonesia (UI) Strategic Plan-s Key Performance Indicators. Therefore, the success in carrying out this construction projects is enough to enhance UI-s annual performance overall, both the activity performance and budget performance. But in practice, the implementation of construction projects in UI didn-t always succeed as expected. The construction projects were often late or delayed which subsequently followed by the termination of the contracts, it would then hamper the operational activities. This study aims to develop a Quality Management System (QMS) of construction procurement process to improve the quality of contractor-s performance. The research methods used are literature study, survey to targeted respondents, and statistical analysis. This QMS development is expected to improve the quality of contractors by a better construction procurement process and be able to reduce the failure of the construction projects.

Keywords
Procurement; Quality Management System

Topic
Civil Engineering

Link: https://ifory.id/abstract/k6xRLjEtAMUZ

Corresponding Author
Riswandha Risang Aji

Institutions
Urban and Regional Planning UNISBA

Abstract
Environment is related to tourism as one of determinant to determine tourism destination competitiveness. Environmental determinants that can affect destination competitiveness are society, technology, culture, demographic, economy, geography, history, infrastructure, law, opponent, politics, and resources. This research aims to explain how environmental determinants take effect to destination competitiveness in Pentingsari tourism village. This research finds out that seven environmental determinants which are society, culture, economy, geography, infrastructure, opponent, and resources take effect on destination competitiveness by using nature and local value that live in Pentingsari tourism village. But some environmental determinants do not take effect in Pentingsari tourism village such as technology, demographic, history, law, and politics. Lack of nature relation is the main reason that five environmental determinants do not take effect on destination competitiveness. This research conclude that environmental determinants take effect to destination competitiveness in Pentingsari tourism village through seven determinants

Keywords
Environmental Determinants, Destination Competitiveness, Tourism, Village

Topic
Environmental Engineering

Link: https://ifory.id/abstract/DmtkEQpqZFy8

Corresponding Author
Yeni Yulianti

Institutions
a)b)c) Culinary Arts Vocational Education Study Program, Faculty of Engineering, State University of Jakarta
Kampus A, Jl. Rawamangun Muka, RT.11/RW.14, Rawamangun, Kec. Pulo Gadung, Kota Jakarta Timur, Daerah Khusus Ibukota Jakarta 13220
*yeni.yulianti[at]unj.ac.id

Abstract
The purpose of this research is 1) to develop interactive multimedia-based learning media on napkin folding material; 2) measure the feasibility of interactive multimedia-based learning media on napkin folding material. The subjects were students of Culinary Education-FT-UNJ. The research method used is the R&D with a development model that is with the 4D model (Define, Design, Develop, Disseminate). Data analysis techniques with the Content Validity Ratio (CVR) method. Interactive multimedia programs used are Adobe Animate 2019 and Adobe Premiere Pro CC 2019. Based on the results of the validation of the instrument the user gets a value of 0.41, the score is included in the "In Accordance" category. The results of the first and second expert material validation calculations on interactive media were 94.6% and 85.7% with the criteria of meeting the feasibility aspects. Furthermore, the results of the validation of media experts in the media assessment were 86.4% and 81.8% with the criteria of meeting the feasibility aspects. After observing the field group trials, 84.38% was obtained with the "Eligible" criteria. The media is declared "Eligible" based on the ability of students to use interactive media about napkin folding as a learning medium for basic course procedures.

Keywords
Media; Interactive Multimedia; Napkin Folding

Topic
Technical and Vocational Education

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

Corresponding Author
Asep Barnas Simanjuntak

Institutions
1. Universitas Pendidikan Indonesia
2. Politeknik Negeri Bandung

Abstract
Abstract. Radiation pattern is an important parameter of the of the antenna performance. This parameter needs to be measured not only accurately but also as fast as possible. For this purpose, the automatic measurement system has been developed. In this research, the system is implemented to analyse the radiation characteristic of Yagi antenna by measuring its radiation pattern. The measurement result of the patterns is compared to those of computer simulation as well as table characteristics of Yagi antenna. For this purpose, a Yagi antenna is designed and realized as the radiation pattern measurement object. Then, the students conduct the experiment to measure and analyse the effect of parasitic elements to the radiation pattern performance of the antenna. The questionnaire is carried out as the method of the research and directed to the students of the Telecommunication Study Program, Bandung State Polytechnic.

Keywords
antenna radiation pattern, Yagi antenna, parasitic elements, antenna radiation pattern measurement

Topic
Engineering Education Research

Link: https://ifory.id/abstract/Ae4E9pDgPLK3

Corresponding Author
Dea Rachma Maulida

Institutions
Departemen Pendidikan Teknik Arsitektur, Fakultas Pendidikan Teknologi dan Kejuruan, Universitas Pendidikan Indonesia,

Abstract
This research aims to determine student-s understanding level after learning by using animation and powerpoint media on construction and utility lesson in SMK 7 Baleendah in competency Modeling and Building Information on 11th Grade. The study design used Pre-experimental design of One Group Pretest-posttest. The research set XI DPIB 1 as an experimental 1 using animation and XI DPIB 2 as an experimental 2 using powerpoint. Beside the pretest and posttest, the student were given the questionnaire about the evaluation of media used. The results of the questionnaire respondents fall into the category of strongly agree. The category confirms that the use of animated learning media and powerpoints are necessary in the learning process of the material understanding building pieces. While the data which are gathered from the results of the pretest and posttest are concluded that the difference in the increase of students understanding are not significant after using animation learning media and powerpoint learning media on Construction Construction and Utility subjects.

Keywords
Animation, Powerpoint, Student-s Undestanding.

Topic
Technical and Vocational Education

Link: https://ifory.id/abstract/76dLaXfVkt2q