Indonesia Conference Directory

Corresponding Author
Jacika Pifi Nugraheni

Institutions
Universitas Sebelas Maret, Jl. Ir. Sutami, Surakarta, Indonesia

Abstract
The institutional formation of the Soloraya Tourism Forum is one of the governments efforts to build tourism in Soloraya in a synergic, integrated and sustainable manner. This study seeks to discuss the perspective of institutional theory related to aspects of network analysis at the empirical level to analyze whether the formation of a soloraya tourism forum is able to strengthen the network or even sharpen the competition of interests among stakeholders. Many institutions emphasize the rules of the game and collective activities for the common or public interests, for this reason this paper focuses on the structure, functions and management of forums to find answers to research questions. The method in this study uses document analysis, literature study and direct observation. The results of the study indicate that the establishment of the soloraya tourism forum institution sharpens competition for interest. Stakeholders perceptions vary mainly in relation to the implementation of regional autonomy. They tend to stay away from the integrity that can be identified from the policies of each region, so as not to support the success of the Soloraya Tourism Forum. We also describe interactions between stakeholders that are not related to each other.

Keywords
tourism institutions, perception, network analysis

Topic
Public Policy, Public Service and Sustainable Development

Link: https://ifory.id/abstract/VCZ7FNXzBWJq

Corresponding Author
Sutikno Madnasri

Institutions
Advanced Composite Laboratory, Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang
Sekaran Gunung Pati Kota Semarang Jawa Tengah, Indonesia, 50229
*Email: smadnasri[at]yahoo.com

Abstract
The purpose of this research is to characterize Hibiscus tiliaceus L. flowers for green photoresist application. As an organic material, it is expected become an alternative to substitute chemicals have been used to date in it’s synthesis process. This research was designed in four steps, namely flower extraction, characterization of thin films of extracted flower liquid, photoresist fabrication, and characterization of photoresist thin films. The liquid mass fraction of Hibiscus tiliaceus L. flowers was optimized in the range of 10-50% using distillation method. The ocean optic Vis-NIR USB 4000 and Perkin Elmer Frontier FT-IR were used to investigate their optical properties and while Digital CCD Microscope MS-804 Scopeman was used to observe their microstructures. The electrical properties were studied using I-V Meter Elkahfi 100. The photoresist sensitivities were determined through UV and X-ray exposures on their surfaces and the simple patterns were designed for this work. The manufactured organic photoresist matched on the absorbance in wavelength range of 350-1050 nm with the highest absorbance value of 0,3.

Keywords
Epoxy; Hibiscus tiliaceus L.; Photoresist; Photosensitivity

Topic
Functional Materials

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

Corresponding Author
Sutikno Madnasri

Institutions
Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang
Sekaran Gunung Pati Kota Semarang Jawa Tengah, Indonesia, 50229
*Email: smadnasri[at]yahoo.com

Abstract
The main problem in the fabrication of dye-sensitized solar cell (DSSC) is the achieved efficiencies have been still relatively low namely under 5%. This make the fabricated devices have not been unable to compete and replace the conventional solar cell role. In this research, the microwave irradiation is applied in coating anthocyanin of musa acuminata bract to improve absorbed anthocyanin dyes in the work electrode so that the absorbed light intensities increased as well. The Electrolux Microwave (EMM 2308X) pada daya 140 Watt was used to generate microwave irradiation and expose it on the thin film surface. The DSSC electrical properties were determined using I-V meter El-Kahfi 10.

Keywords
DSSC; Irradiation; Microwave; Musa Amicunata bract

Topic
Functional Materials

Link: https://ifory.id/abstract/BPmErhRY9w4X

Corresponding Author
Sahrul Saehana

Institutions
a)Physics Education Departement, FKIP Tadulako University, Indonesia
* sahrulsaehana[at]gmail.com
b) Agribussiness Departement, Agriculture Faculty, Tadulako University, Indonesia

Abstract
This study reports characterization of polymer from Lanea coromandelica (houtt) merr which fabricated using solution casting methods. Investigation by scanning electron microscopy (SEM), Electron Dispersive X-Ray (EDX), FTIR, and impedance spectroscopy were done. We found that natural polymer based membrane polymer electrolyte contained metal ion such us silikon and aluminium. It was also found that electric conductivity was about 2 x 10-2 S/m3. We predicted that metal ion contained make the polymer electrolyte be conductive. It was predicted that its polymer was potential for electronic device application. On the other hand, the natural polymer also potential to change plastic application.

Keywords
natural polymer, membrane polymer, application

Topic
Functional Materials

Link: https://ifory.id/abstract/U7uZjGPqYWBd

Corresponding Author
Yulianto Agung Rezeki

Institutions
Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract
Cyclodextrins are a family of cyclic oligosaccharides produced by enzymatic degradation of starch. There are three types of cyclodextrins based on the number of glucose subunits, i.e., α-cyclodextrin, β-cyclodextrin, and γ-cyclodextrin, which respectively have 6, 7, and 8 glucose subunits. Among others, β-cyclodextrin has more advantages in many subjects. This paper provides the development of β-cyclodextrin particles using electrospraying method. In this study, a variation of β-cyclodextrin concentration was carried out to see the effect on the particle diameter. By varying the β-cyclodextrin concentration, the resulting particles have various sizes. The greater the β-cyclodextrin concentration, the greater the diameter of the particles produced. β-cyclodextrin particles can be used in food, pharmaceutical, drug delivery, and chemical industries. The advantage in modifying the particle diameter makes the use of β-cyclodextrin more effective.

Keywords
Cyclodextrin, Electrospraying, Particles

Topic
Synthesis and Characterization Techniques

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

Corresponding Author
Ashianti Stenny Winata

Institutions
(a) Department of Chemical Engineering
Institut Teknologi Bandung, Bandung 40132 Indonesia
(b) Department of Chemical Engineering
Universitas Katolik Parahyangan, Bandung 40141 Indonesia
*santi[at]unpar.ac.id

Abstract
Supercapacitor is considered as promising technology in energy storage system (EES) because of high power, large currents, and excellent cycle stability. In this study, activated carbon was used as the constituent material for electrodes because it owns porous structure with large surface area, owns high conductivity, low cost, and renewable Activated carbon was synthesized from salacca peel by hydrothermal carbonization and chemical activation with KOH. Salacca peel was chosen as a precursor because it has high fixed carbon content and low ash content, but usually discarded as a waste. This research focused on the effect of operating pressure in the hydrothermal carbonization process. The the operating pressure used will determine the water phase in the hydrothermal process, where in this study the pressure is adjusted so that the water is varied in the vapor phase and liquid phase (subcritical water). In hydrothermal carbonization, temperature was varied at 225oC and 250oC with the carbonization time of 5 hours. Chemical activation using KOH as activating agent was done after obtained the hydrochar from hydrothermal carbonization process. Produced activated carbons were characterized by nitrogen adsorption-desorption, scanning electron microscope, Fourier transform infrared, X-ray diffraction, and Raman spectroscopy. Electrochemical properties of these carbons were characterized by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. It is found that the largest surface area of produced activated carbons could be obtained is 2907.31 m2/g and the largest capacitance of supercapacitor is 15.57 F/g.

Keywords
activated carbon; salacca peel; hydrothermal carbonization; subcritical water; supercapacitor

Topic
Functional Materials

Link: https://ifory.id/abstract/9rjhw3CWnERV

Corresponding Author
Rochanda Wiradinata

Institutions
Universitas Swadaya Gunung Jati Cirebon

Abstract
Abstract. Learning is an important factor in achieving educational goals, not only as a means of supporting improvements in the past, but it has been a process that anticipates improving the quality of education in the future that increases progressively. The rapid development in the field of information and communication technology, today goes hand in hand with the advancement of science and technology in the era of learning society or learning society. The existing E-learning system is only able to present the same teaching material to all users without considering their characteristics. On the other hand, there was a lot of criticism of the way the lecturers who conveyed the concept only about nothing and the students were only burdened with a lot of training assignments without any related understanding. Presentation of material contained in textbooks and practice questions does not need to help students to learn to understand it effectively and be improved. The purpose of this study is to discuss site-based learning which includes a needs analysis and technology analysis of website-based learning, formulating the task of analyzing teaching materials, developing teaching materials and sending teaching materials and supporting as a draft in website-based learning, improving the quality of learning, learning and Learn more about teaching material so that it can be accessed anywhere and anytime and by anyone This research is a development research that uses a 4-D model developed by Thiagarajan, which defines, designs, develops and develops to develop website-based learning that involves compiling teaching materials published in websites through performance evaluations evaluated to improve student learning independence in corporate accounting courses. The results of this study indicate that with teaching materials based on WEB that have validated validity by material experts, design experts, practicum experts show that students are independent in learning both from material reading sessions, discussions, work assignments and projects. Learning completeness is indicated by the results of the completeness test which agree that students complete independently and classically.

Keywords
WEB Based Learning, Bank Reconciliation Lecture, Development Research, Performance Assessment

Topic
Computer Science Education

Link: https://ifory.id/abstract/E4FfegrzYaGK

Corresponding Author
Gian Prahasti

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
b) Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
*krijal[at]fi.itb.ac.id

Abstract
Fiber membranes of Polyvinyl Alcohol (PVA)/Shell extract of melinjo (SEM) have been successfully synthesized using electrospinning method. The synthesis begins by making a precursor solution between a mixture of SEM solution and PVA solution. The SEM solution was made at a concentration of 10% using an ethanol mixture with water while the PVA solution was made at a concentration of 20% with a water solvent. The precursor solution ware made by mixing PVA solutions and SEM solution at several mass ratio; 10:0, 10:1, 10:3, and 10:5, and then synthesized into fiber using electrospinning method. Characterization of digital microscope was used to see morphology and diameter of the fibers produced. Likewise, the wettability properties of fiber membrane was determined using contact angle meter. The results showed that as the weight fraction of SEM increased, diameter of fibers changes. Subsequently, the wettability properties of fiber membranes changed as the changing of weight fraction of SEM.

Keywords
Polyvinyl Alcohol (PVA), Shell extract of melinjo (SEM), membrane, fiber, electrospinning

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/3Fbd6XyvamzH

Corresponding Author
Sariwulan Diana

Institutions
Departemen Pendidikan Biologi, Universitas Pendidikan Indonesia

Abstract
A research about the achievement of 21st century students- plant literacy by field trip implementation has carried out, in which it aims to improve students- plant literacy. This study used an quasi-experimental method, non-equivalent control group design. This design includes a group of students observed in the pretest phase which is then followed by treatment with field trip implementation and ends with posttest. The same applied to the control group, which only did conventional lab. The 21st century plant literacy is critical thinking and problem solving regarding the concept of plant diversity. Field trip includes determining the aspects to be observed, carrying out observations and collecting data and discussion of results and reporting. Research instruments include a set of plant literacy questions and its rubric, worksheet for field trip students and its rubric, and questionnaire about student response to the implementation of field trip. There was a slight increase (N-gain 0.16) of students- plant literacy in the experimental class and the control class (N-gain 0.23). Although not significantly different from the control class, but the achievement of 21st century students- plant literacy have potential to develop through field trip implementation. All students respond positively to the field trip implementation.

Keywords
Field trip, 21th century plant literacy, critical thinking and problem solving

Topic
Biology Education

Link: https://ifory.id/abstract/FVua9BRLxDqg

Corresponding Author
Gian Prahasti

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
b) Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
*krijal[at]fi.itb.ac.id

Abstract
Fiber membranes from waste Acrylonitrile Butadiene Styrene (w-ABS)/Polyvinylpyrrolidone (PVP) has been successfully made using an electrospinning method. The precursor solutions were prepared using DMAc solvents at a concentration of 30 wt%. We varied the w-ABS:PVP ratio of 3:0, 2.9:0.1, 2.5:0.5, and 2:1. A digital optical microscope observed the morphology of the fabricated fiber membranes while a contact angle meter determined their wettability. The results showed that the morphology of the fibers changed with the ratio of w-ABS:PVP. Consequently, the variation of w-ABS:PVP ratio caused a significant effect to the value of membranes contact angle.

Keywords
fiber membranes, electrospinning, waste ABS, PVP, wettability

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/Pd3WVyCE42x7

Corresponding Author
Dionysius Joseph Djoko Herry Santjojo

Institutions
Department of Physics, Faculty of Mathematics and Natural Sciences and
Collaborative Research Center for Advanced System and Material Technology,
Brawijaya University Indonesia

Abstract
Surface texturing of carbon based thin film such as amorphous carbon or diamond like carbon (DLC) is the key technology in the development of functional surface for many kinds of sensors. This study explored the possibilities of processing the carbon film’s surface by means of plasma oxidation to produce effective textures. A high density oxygen plasma was generated by a combination of RF and DC power in a vacuum chamber. The high density plasma was applied selectively onto the surface of a DLC film via a printed mask lithography technique. Circular dots with the diameter of 25 μm, 50 μm, and 100 μm were printed on the DLC film. Oxidation reaction was expected on the exposed surface, i.e. the area surrounded the dots. The results show the oxidation effectively removed the DLC on the unmasked area producing 3D cylindrical patterns. The plasma processing which was carried out for 2 hours was monitored and diagnosed using an optical emission spectroscopy (OES). The oxidation was controlled by atomic oxygen which was the dominant species observed in the plasma. The removal (etching) rate was 9μm/h with 91%, 98% and 99% pattern accuracy related to the larger diameter studied in this work. Observations using a Raman spectroscopy confirmed that the printed mask effectively protects the DLC from the etching process and other indirect processes.

Keywords
oxygen plasma, RF-DC plasma, oxygen etching, diamond-like carbon, surface-texturing, high density plasma

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/PuHQz6XLr7Wj

Corresponding Author
Rusman Kosasih

Institutions
Material and Metallurgical Engineering Department, School of Post Graduate Studies, Engineering Faculty, University of Indonesia
Kampus UI Depok, Jawa Barat 16424

Abstract
PVD-PLD process nowadays is used to produce a high quality thin film for superconductor – electric layers – medical application – magnetic layers – and resistant coating. This study is a series of PVD research which is used to find the best solution of coating PVD, so that the damage of the tool steel pin made from SKD 61 - hardness 48 ± 1 HRc can be minimized. The research stage was carried out by making research samples in the form of dummy blocks, which are made from SKD 61, PVD-PLD process with 3 types of coating material (AlCr 50:50 – AlTi1 50:50 – AlTi2 63:37), without Active gas such as N or C. The deposition of thin layer showed a promising result condition in which the element of the target exists by testing the samples using FESEM, SEM, XRF, EDS and Micro Hardness Vickers. The characterization testing was done at Physics Research Centre LIPI and PT XYZ Laboratory. The PLD – NdYAG process, which was done using Wave length 1064 nm, Q – switch delay 180 µs/ 70 mJoule - Vacuum 1.16 ~1.35 Torr - Process time 10 minutes, came out with a surface morphology of Al – Ti – Cr particle with 10 – 20 nm amorphous particles. The hardness of surfaces are 474 mHv – 523 mHv (single layer) and 477 mHv – 501 mHv (multiple layer). All of these materials have the same order of hardness from minimum to maximum for both single layer and multiple layer, which is AlCr – AlTi2 – AlTi1. This result will be a reference for further research activities, such as PLD process optimization, Active N gas application and Substrate heat treatment.

Keywords
PLD process – Coating material – Coating layer – Nanoparticle

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/Qc3wRqzn269r

Corresponding Author
Endri Endri

Institutions
Universitas Mercu Buana

Abstract
Penelitian ini bertujuan untuk mengestimasi dan menganalisis pengaruh ukuran perusahaan (company-s size), muslim di dewan direksi (muslim on board), wanita di dewan direksi (woman on board), usia perusahaan (company-s age), kepemilikan asing (foreign ownership), efek syariah perusahaan (Islamic securities), profitabilitas (profitability), likuiditas (likuidity), leverage (leverage) terhadap pengungkapan Islamic Social Report pada Perusahaan Industri Barang Konsumsi yang terdaftar di Indonesia Sharia Stock Index (ISSI) Bursa Efek Indonesia (BEI) dalam rentang tahun 2011-2017. Populasi dalam penelitian ini adalah 29 perusahaan sektor industri barang konsumsi yang terdaftar di Indeks Saham Syariah Indonesia (ISSI) tahun 2011-2017. Metode pengambilan sampel dalam penelitian ini adalah purposive sampling. Jumlah sampel dalam penelitian ini adalah 23 perusahaan sektor industri barang konsumsi. Teknik analisis menggunakan Model Analisis Regresi Data Panel. Analisis menunjukkan bahwa ukuran perusahaan (company-s size), usia perusahaan (company-s age), profitabilitas (profitability), berpengaruh positif signifikan terhadap pengungkapan Islamic Social Report (ISR) pada Perusahaan Sektor Pertanian dan Perusahaan Sektor Industri Barang Konsumsi. Sementara itu, muslim di dewan direksi (muslim on board), wanita di dewan direksi (woman on board), kepemilikan asing (foreign ownership), efek syariah perusahaan (Islamic securities), likuiditas (likuidity), leverage (leverage) tidak berpengaruh signifikan terhadap pengungkapan Islamic Social Report pada Perusahaan Sektor Pertanian dan Perusahaan Sektor Industri Barang Konsumsi

Keywords
Islamic Social Reporting, Indeks Saham Syariah Indonesia, industi barang konsumsi

Topic
Manajemen Keuangan

Link: https://ifory.id/abstract/v9bhHpcFJuCG

Corresponding Author
Syamsiar S. Russeng

Institutions
Occupational Safety and Health Departement, Public Health Faculty Hasanuddin University

Abstract
The diseases that related to diving among the divers require special attention. Incorrect diving is not only caused a short-term risk but also a long-term risk. The aim of this study is to descriptively analyze the knowledge of fishermen due to work-related diseases, analyze the factors of work-related diseases and provide training of standard diving techniques in Lumu-Lumu Island Makassar. The type of research is observational analytic with the cross-sectional study. The population of this study are all fishermen in Lumu-Lumu Island, the sample was taken using simple random sampling techniques. This was conducted on March-August 2019 in Lumu-Lumu Island, Makassar. Primary data collected from the interview using a questionnaire with the fisherman. Secondary data were collected from Puskesmas and Polindes. The result shows that the knowledge, attitude, and act of the divers are increased after the socialization that conducts in Lumu-Lumu Island. This provides the result of a statistical test that shows Asymp sig. (2-tailed) from knowledge, attitude and the action of divers 0,001<0,05 for each variable which mean there are an increase of knowledge, attitude and the action after the socialization and training for divers in Lumu-Lumu Island.

Keywords
Barotrauma, traditional divers, knowledge, attitude, practice

Topic
Quality, Safety and Service

Link: https://ifory.id/abstract/PDEZy9FMp8hL

Corresponding Author
Ninik Pujaning Dyah

Institutions
1Master of Hospital Management, Faculty of Medicine, Universitas Brawijaya Malang

2Faculty of Economics and Business, Universitas Brawijaya Malang

Abstract
Background: Customer satisfaction is a feeling of pleasure or disappointment experienced by customers after comparing the services they receive with their expectations. Dissatisfaction and complaints may arise if the product given to the customer doesn-t fit with customer expectations. Handling complaints at Pandaan Hospital which is a research site shows that it has not perform optimally. This condition is due to lack of staff-s knowledge. Complaint Handling training with the right method is a crucial to increase staff-s knowledge. Therefore, collaborative and cooperative methods are one of the active learning models that can be considered for training methods because they may increase and retain staff-s knowledge on handling complaint. Objective: To determine the effect of complaint handling training with collaborative and cooperative methods on increasing and retaining staff-s knowledge. Method: This study was a quasi-experimental with pretest and post-test design. The study was conducted from February to April 2019 at Pandaan Hospital. Respondent of the research were 67 hospital staff who often interacted with hospital customers. Knowledge was measured by 4 indicators wich are receiving, reviewing, investigating and resolving complaints. Staff-s knowledge was measured in 3 stages wich are pretest, 1st post-test on day 7, and 2nd post-test on day 30. Results: The Friedman test showed significant differences in scores for all knowledge indicators (<0.05). The Wilcoxon test showed a significant difference between pretest and 1st post-test, and pretest and 2nd post-test (sig <0.05). The result of comparison between 1st post-test and 2nd post-test did not show a significant difference (sig> 0.05) for all knowledge indicators. Conclusion: Complaint handling training with collaborative and cooperative methods influences in staff-s knowledge and their memory retention after training

Keywords
collaborative and cooperative methods, active learning models, complaint handling, knowledge change, memory retention.

Topic
Human Resources Management

Link: https://ifory.id/abstract/BA4rEvj3ZWuQ

Corresponding Author
I Wayan Weta

Institutions
* Faculty of Medicine, Universitas Udayana, Denpasar, Bali, Indonesia

** Eijkman Institute for Molecular Biology, Ministry of Research Technology and Higher Education, Republic of Indonesia, Jakarta, Indonesia

Abstract
Background and Objectives: Obese Indonesians, including Balinese, are at higher risk of co-morbidities like, CVD, diabetes, non-alcoholic fatty liver disease. Urban Balinese are changing their diet from traditional to fast foods and the like that are high in saturated fats. Nutritional modification, such as increasing n-3 PUFA content in the diet, may aid in managing body fat accumulation-related diseases. This study investigated the effects of supplementation of n-6:n-3 PUFA with ratio of 2:1 on body fat reduction in young obese Balinese women. Methods and Study Design: Sixty-six young obese Balinese women, aged 18-25, were randomly assigned equally into Intervention and Control groups, supplemented with 2100 mg:1100 mg and 240 mg:100 mg of n-6:n-3 PUFAs, respectively. Data were collected at baseline, 6, and 12 weeks of intervention. BMI, waist circumference (WC), waist-to-height ratio (WHtR), conicity index (CI), triglyceride concentrations, and Lipid Accumulation Product (LAP) were measured. The participants were advised to maintain <1500-Kcal daily energy intake and participate in a guided low-impact aerobics once a week. Results: After 12-weeks supplementation, all body fat indices (BMI, WC, WHtR, CI, and LAP), decreased significantly weather were unadjusted or adjusted by the reduced of energy intake in the Intervention group. Otherwise, in the Control group only some of WC indices (WC, WHtR, and CI) decreased stasticically. BMI and WC of the Intervention group decreased significantly more than the Control group. Conclusion: Twelve-week intervention with high-dose of low n-6:n-3 PUFAs ratio and restriction energy intake, reduced body fatness selectively in young obese Balinese women

Keywords
low n-6:n-3 PUFA ratio, young obese Balines women, body fat

Topic
Nutrition and Quality of life

Link: https://ifory.id/abstract/T9rcdemBhGRq

Corresponding Author
Tosawat Seetawan

Institutions
a Instrumentation and Electronic Laboratory, Department of Physics, Institut Teknologi Sepuluh Nopember, Arief Rachman Hakim Rd, Surabaya, 60111 East Java Indonesia
b Thermoelectric Research Laboratory, Center of Excellence on Alternative Energy, Reseach and Development Institution, Sakon Nakhon Rajabhat University, 680 Nittayo Rd, Mueang District, Sakon Nakhon 47000, Thailand
c Program of Physics, Faculty of Science and Technology, Sakon Nakhon Rajabhat University, 680 Nittayo Rd, Mueang District, Sakon Nakhon 47000, Thailand

Abstract
Research on crystal structures and thermoelectric properties has been carried out using BiTe material. The sintering method used is hot press. Hotpress pressure comes from the bottom up. Temperature variations used in hotpress are 400, 450 and 500°C. Analysis of crystal structure used XRD. Based on the XRD results, the result is that the crystal structure of BiTe bulk is hexagonal. Thermoelectric properties measurements used ZEM-3. The sample is measured in a temperature range of 50-200°C. Based on the measurements, the sample with hot press 500°C has the highest Seeback coefficient and power factor values which are -71 uV/K and 3.6 x 10-4 W/mK^2, respectively. The sample has the best performance at room temperature and has decreased performance with increasing temperature. While the best electrical resistivity value is owned by the sample with hot press 450°C with a value of 1.28 mΩ cm at room temperature. Overall, the higher the temperature used when sintering, the better the performance produced. Thus, the BiTe material can be considered as a thermoelectric material.

Keywords
Harvesting Energy, Thermoelectric technology, Bismuth Telluride

Topic
Energy and environment materials

Link: https://ifory.id/abstract/QWPc6vLAjGCY

Corresponding Author
Tosawat Seetawan

Institutions
a Instrumentation and Electronic Laboratory, Department of Physics, Institut Teknologi Sepuluh Nopember, Arief Rachman Hakim Rd, Surabaya, 60111 East Java Indonesia
b Thermoelectric Research Laboratory, Center of Excellence on Alternative Energy, Reseach and Development Institution, Sakon Nakhon Rajabhat University, 680 Nittayo Rd, Mueang District, Sakon Nakhon 47000, Thailand
c Program of Physics, Faculty of Science and Technology, Sakon Nakhon Rajabhat University, 680 Nittayo Rd, Mueang District, Sakon Nakhon 47000, Thailand

Abstract
From the research to determine the thermoelectric properties and crystal structure of SbTe material synthesized by ball mill at 350 rpm for 10 hours and sintered with hot press. The hot press method was varied at the time of hot press for 1, 2 and 3 hours. The hot press temperature is 400 °C with a pressure of 25 MPa. Then all materials were tested by XRD and ZEM 3. Based on the XRD test performed, all materials had hexagonal crystal structures. From ZEM 3 measurement known that the best thermoelectric properties value is in sample 3 which has an electrical resistivity 0.35 mΩ cm at 331 K, Seebeck coefficient 147 uV/K at 473 K and power factor 4.53 mW/mK^2 at 331 K.

Keywords
Harvesting Energy, Thermoelectric technology, Antimony Telluride

Topic
Energy and environment materials

Link: https://ifory.id/abstract/Yx7tHEXDRGnz

Corresponding Author
Don Jaya Putra

Institutions
Bandung Institut of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
*donjayaputra2016[at]gmail.com

Abstract
Sitinjau Laut area of Padang city is very prone to landslides because it has a very steep terrain (70º to 85º), improper land use and high rainfall. In the context of investigating potential landslides in this region, landslide potential analysis was carried out in five locations with a rating method for seven variables; slope, soil and rock structure, effective soil depth, rock weathering level, land use, vegetation density and rainfall. The total value of each location is, the first location has a total value of 26 with a category of severe landslide potential, the second location has a total value of 26 with a category of severe landslide potential, the third location has a total value of 24 with a category of severe landslide potential, the fourth location has a total value 21 with a moderate landslide potential category and the fifth location has a total value of 22 with a moderate landslide potential category. It is hoped that this research can provide input to the Regional Government in the context of landslide mitigation in the region. So that the risks posed by landslides can be minimized for the future.

Keywords
Landslides, disaster mitigation, debris, physical, region

Topic
Physics related sciences

Link: https://ifory.id/abstract/D7Xz4PkW6LVC

Corresponding Author
Jacika Pifi Nugraheni

Institutions
Universitas Sebelas Maret, Jl. Ir. Sutami, Surakarta, Indonesia

Abstract
The institutional formation of the Soloraya Tourism Forum is one of the governments efforts to build tourism in Soloraya in a synergic, integrated and sustainable manner. This study seeks to discuss the perspective of institutional theory related to aspects of network analysis at the empirical level to analyze whether the formation of a soloraya tourism forum is able to strengthen the network or even sharpen the competition of interests among stakeholders. Many institutions emphasize the rules of the game and collective activities for the common or public interests, for this reason this paper focuses on the structure, functions and management of forums to find answers to research questions. The method in this study uses document analysis, literature study and direct observation. The results of the study indicate that the establishment of the soloraya tourism forum institution sharpens competition for interest. Stakeholders perceptions vary mainly in relation to the implementation of regional autonomy. They tend to stay away from the integrity that can be identified from the policies of each region, so as not to support the success of the Soloraya Tourism Forum. We also describe interactions between stakeholders that are not related to each other.

Keywords
tourism institutions, perception, network analysis

Topic
Public Policy, Public Service and Sustainable Development

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

Corresponding Author
Mochamad Malik Akbar Rohandi

Institutions
Fakultas Ekonomi dan Bisnis-Manajemen, Universitas Islam Bandung (Unisba)

Abstract
This study aims to measure the quality of higher education websites in Bandung using the Webqual 4.0 method based on user ratings of actual perceived quality of expected quality so as to make it easier for prospective students to obtain the information needed and make it a one stop information. The research method used in this research is descriptive quantitative method. This study uses primary and secondary data, the sampling process uses non-probability with Convenience sampling technique, the minimum number of respondents based on the Bernoulli method is 97 respondents. Data analysis techniques using Importance Performance Analysis (IPA). The results of this study in terms of usability are in the important category and the achievement level of satisfaction is 96.46%, in terms of Information Quality is in the important category and the level of achievement satisfaction is 96.01%, in terms of Service are in the important category and the level of achieving satisfaction 96.20 %.

Keywords
Information Quality, Level of Satisfaction Achievement, Service, Usability, Web Quality

Topic
Management

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

Corresponding Author
Muhammad Hatta

Institutions
Department of Animal Production, Animal Science Faculty Hasanuddin University
Jl. Perintis Kemerdekaan Km. 10 Makassar, 90245
Corresponding email: muhammadhatta[at]unhas.ac.id

Abstract
The research aims to analyze the differences between body weight and morphometric of Bali cattle in the area of People Breeding Station (PBS) and Non-People Breeding Station (NPBS). The total number of measurable Bali cattle was 204 heads each consisted of 96 male and 108 females from PBS and NPBS. Mean and standard deviation of body weight Bali male cattle in PBS was significantly higher (p<0.01) than in NPBS of the same age groups. Mean and standard deviation body weight of Bali female cattle in PBS significantly (p<0.01) higher than in NPBS for age 0.1-1.0 and 1.1-2.0 years group but bodyweight for 2.1-3.0 and 3.1-4.0 years groups in PBS non significantly (p>0.05) than in NPBS. All of the morphometrics data was found that such as body lenght (BL), shoulder height (SH) and chest circumference (CC) of Bali cattle increased with the age advancement. Morphometrics of Bali cattle for age less than 3 years in PBS significantly (p<0.01) higher than Bali cattle in NPBS. In conclusion, the body weight and morphometrics of Bali cattle at PBS were higher than those at NPBS.

Keywords
Bali cattle. breeding station. body weight. morphometric

Topic
Animal production Technology

Link: https://ifory.id/abstract/JArYG2E34vnV

Corresponding Author
Lola Kurnia Pitaloka

Institutions
Universitas Negeri Semarang

Abstract
Creative economy is an economic concept that promotes the creativity of the actors with the idea of relying on human resources as a factor of production by creating creativity as a resource that can always be updated in the process of economic activity and is expected to drive sustainable economic growth. Creative economic actors culinary subsector is hardly detected due where are the actors, although provided center point for culinary actors but limited place for actors an obstacle. Reconvene the concentration of culinary subsector or providing more places to be the center point for the perpetrators culinary subsector so that all have the same opportunity to widely known. Location of this research is in the Semarang City. Methods of data collection used interviews and documentation. Analysis data methods used spider web to see the area of convergence and determine convergence area in accordance with the state of the region and the state of the environment. Descriptive analysis is used to describe a general overview and potential concentration. Population in this study is all creative economic actors of culinary subsector. Related parties are used as a resource is the Department of Cooperatives and SMEs, the Department of Tourism, Department of Industry and the Association of creative economic actors culinary subsector and elements of the creative economy businesses modern. Sample in this study used stratifie random sampling. Informants selected for samples are (1) the related department for culinary subsector; (2) creative economic actors culinary subsector; (3) academics and associations that give high attention on the creative economy culinary subsector. The results of this study are (1) a development area of economic creative subsector culinary divided into five distinct regions, there are six center point subsector culinary established by the Government of Semarang, the area Simpang Lima, Chinatown, SMEs Center Banyumanik, Pekunden district, Pandanaran district and SMEs Gallery in the Old City; (2) Based on the distribution of types of cuisine can be divided into four areas based on its type, namely (a) the type of center souvenirs will be concentrated in Banyumanik and Central Semarang (b) the type of café is located in Central Semarang, South Semarang and Tembalang; (c) the type of meals centered in the region of Central and South Semarang and (d) the type of streetfood concentrated in one region, namely South Semarang. The conclusions of this studies are (a) necessary for the government to increase the number of concentration for a culinary subsector because there are many actors who have failed the creative economy; (B) the need for training for a culinary subsector creative economic players to want to join and use the concentration of efforts in order to facilitate the arrangement of the environment and to maintain the comfort and cleanliness of the environment; (C) the need for policing, especially health and hygiene environment for creative economic players after selling.

Keywords
Creative Economy, Culinary Subsector, Center Point, Development, SMEs

Topic
Sustainable development

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

Corresponding Author
JAKA AMINATA

Institutions
Fakultas Ekonomika dan Bisnis, Universitas Diponegoro

Abstract
This study analyzes the influence of maritime transportation costs, namely (connectivity and port infrastructure) on Indonesian exports to APEC member countries through sea transportation modes, using the gravity model approach. The method used is panel data regression with the Common Effect Model (CEM). The condition of maritime transportation in Indonesia shows that the presence of Asaz Cabotage can encourage the national shipping industry, even though export / import activities between countries are still dominated by foreign companies. Based on the estimation results show that the GDP of Indonesias per capita, GDP per capita of trading partner countries, economic distance, Quality of Port Infrastructure (QPI) and Shipping Bilateral Liner Connectivity Index (LSBCI) significantly affects the volume of Indonesian exports through sea transportation modes.

Keywords
Export, Sea Transportation Mode, Quality of Port Infrastructure, Shipping Bilateral Liner Index

Topic
Economics

Link: https://ifory.id/abstract/3bVHNCme4Kga

Corresponding Author
Riza Fahmi

Institutions
1Research Group of Earth Resource Exploration, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology (ITB), Indonesia, Ganesha 10, Bandung, Indonesia
2Research Group of Petrology, Volcanology, and Geochemistry, Faculty of Earth Sciences and Technology, Bandung Institute of Technology (ITB), Indonesia, Ganesha 10, Bandung, Indonesia
Corresponding author*: rizafahmi90[at]gmail.com

Abstract
Alteration is the key aspect in exploration, after alteration model in one prospect area has been determined. It could be reference to us how to find information for the next analysis to find any prospect area for mining. The important aspect for determining alteration zone was mineral associations in the rock samples. It was a challenge for the explorer to determine the alteration not only based on the theory, but also how the laboratory testing was managed properly. In this paper, we demontrated a process how the alteration in selected area could be interpreted from field investigation and delineated alteration zone based on mineral association. The petrography and XRD analyses were performed to confirm field investigation. The analyses were used to determine the information about alteration intensity, primary, and secondary mineral. Each petrography and XRD sample testing result was interpreted to identify the alteration zone. Following the Petrography and XRD analyses, we classified the mineral association to five areas, Lawe Sikap, Lawe Pinish, Salim Pinim, Nembak Alas, and Lawe Sigala.The alteration zones in the five areas were dominated by Skarn, Prophylitic, Advance Argillic, and Phylic.

Keywords
Alteration, Exploration, Petrography, XRD, Interpretation

Topic
Geology

Link: https://ifory.id/abstract/Jk3ATrbxvDyX

Corresponding Author
Mingshi Gao

Institutions
School of Mines,
China University of Mining and Technology

Abstract
Rock-bursts, which are usually collapsed, caved-in, or sealed off instantaneously, cause risks to mine safety and production. Approximately 85% of rock-bursts happen in roadways when the elastic complementary energy accumulated in the rock exceeds the minimum kinetic energy associated with damage to the surrounding rock. The greater the difference between the elastic complementary energy and the minimum kinetic energy, the more likely the rock-burst is. According to the mechanism of roadway destruction by rock-bursting, a strong-soft-strong (3S) structural model to prevent rock-bursts from occurring was established and analysed. The result showed that the 3S structural model encompassed: the strength characteristics of the structure itself, stress adjustment, wave absorption, deformation and anti-deformation, energy consumption, etc. Stress criterion and energy rule for the small inner support structure destroyed by rock-bursting were deduced. Finally, based on the 3S model, the engineering application was theoretically discussed; several techniques such as decreasing shock energy, deploying adequate soft structures, and improving support strength were proposed to prevent roadway destruction by rock-bursts.

Keywords
mining engineering; rock-bursts; roadways; strong-soft-strong (3S) mechanical model; engineering applications

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/HdWcFwvbAg3M

Corresponding Author
Nova Anika

Institutions
Department of Biosystems Engineering, Institut Teknologi Sumatera

Abstract
To feed the increasing world population, the demand for food and consequently irrigation water is predicted to increase in the future. However, the amount of water available for agriculture is increasingly becoming uncertain in the face of global climate change. Therefore, improvement in water productivity is necessary for sustainable production of crops such as rice. Water productivity varies across regions and across fields within a region, and is dependent on several factors such as crop patterns, climate patterns, irrigation technology and field water management, land and infrastructure, and other inputs, including labor, fertilizer, and machinery. The objective of this study was to estimate water supply and demand in Sumani watershed, a primary rice-producing region, to analyze water productivity for sustainable rice production. Approximately 30% of the area in Sumani is paddy fields, which depend on the availability of water resources.. Approximately 67% of the rice fields are cultivated three times a year. In general, the planting schedule of rice is divided into three periods: main planting season (wet season), Gadu planting season (planting in the end of wet season and harvesting in the dry season), and dry planting season. Although the planting schedules are not uniform, we assumed these as uniform, to simplify the analysis, by using majority cropping schedule in the study site. To ensure water availability in the dry season, four types of irrigation systems were used: technical irrigation (TI), semi-technical irrigation (STI), simple irrigation (SI), and non-government irrigation (NGI). The results showed that depending on the planting season and irrigation system, water productivity varied from 0.33 kg/m3 in the Gadu season in areas irrigated by the SI and NGI systems to 0.73 kg/m3 in the wet season in area irrigated by the TI system. The average water productivity in the study area was 0.53 kg/m3. Water productivity in this study area was lower than the average water productivity in other rice production areas in Java and Bali.

Keywords
Irrigated area, rice, water productivity

Topic
Land and water resources engineering

Link: https://ifory.id/abstract/kzfNy8URhj2m

Corresponding Author
Zulkarnaen Yusuf

Institutions
1 ) PT Pertamina Hulu Energi Siak, Indonesia
2) Petroleum Engineering Magister UPN “Veteran” Yogyakarta, Indonesia

Abstract
The problem of sand production is often found in oil fields from the layers of sandstone (rock sand) that are productive in shallow depths to deep ones. Sand production begins to occur if stress exceeds the strength of rock formations, the strength of these rock formations which is the strength of natural cementation of rocks in relation to granules of sandstone in formation. In addition, sand production is very sensitive to the rate of production, where at the critical production level, sand will be produced. In sandstone formations, cement granules cementing material is not consolidated, so that the sand will be produced starting from the beginning of the oil well being completed. Sandstone formations may not produce sand at the beginning of production, but after a certain production period sand begins. It can be understood that with decreasing reservoir pressure, each sand grain will increase the over burden pressure which then results in increased stress between the grains to exceed the ability of cementing material in the sandstone formation. Sand problems in oil production wells can greatly lead to shut down of production and the increased frequency of using Rig Services in intervention well activities, which caused increasing operational costs. One way to solve the problem is by using a Progressive Cavity Pump (PCP) where the movement of the rotor to the stator passes through the production fluid including sand that is produced to the surface so that the pump stuck problem due to the accumulation of sand can be overcome. In addition to the ability to overcome the sand, PCP provides a high level of pump efficiency reaching up to 75%.

Keywords
Unconsolidated sand, Rate Critical, Progressive Cavity Pump, Pump Efficient, pump stuck, Stress Formation, well intervention, Overburden Formation

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/Kkg8BtP2h7j4

Corresponding Author
Steven Chandra

Institutions
Petroleum Engineering, Institut Teknologi Bandung

Abstract
Field X is an offshore field that is included in the deep-water area managed by an oil and gas company in Indonesia. From a number of tests conducted it was found that are presence of sand problems in this field especially in well G1 so that several studies were conducted. From the results of the study, it is determined that the use of Frac pack is one of the most appropriate ways, besides controlling sand problems, it also increases gas production on field X. The Frac pack method is a well stimulation by combining gravel pack to control the sand problems with hydraulic fracturing which is designed to have high conductivity to increase productivity over the well. In this paper, a calculation model is developed to find out the optimum fracture half length, fracture width and also the pumping schedule of the Frac pack with sensitivity of proppant concentration. Then the results will be compared with existing commercial software. The challenge faced in frac pack modeling for well G1 is large permeability so that the possibility of leakage occurring is greater and then handled by increasing the injection rate. Based on the calculations and analyzes that have been done, for the well G1 on field X it will be optimum to operate if frac pack is installed with the type of brady sand 20/40 proppant and dynafrac HT 30 as fracturing fluid, so that half fracture length, X_f 76.8 ft is obtained with fracture width, w_f 0.4355 ft and 5 times fold of increase in the production. From this study it can be concluded that the calculation model made can be accepted and used commercially.

Keywords
Frac pack, fracture half length, fracture width, fold of increase

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/vD4FupBJyHRg

Corresponding Author
Kalih Trumansyahjaya

Institutions
Jurusan Arsitektur Fakultas Teknik Universitas Negeri Gorontalo

Abstract
This research was conducted to influence the philosophy of "Langga" to Gorontalo architecture in Gorontalo community settlement which aims to reveal the relationship between "Langga" philosophy with Gorontalo architecture in Gorontalo society. The main problem that exists in this research is how to draw the red thread between the contents of meaning that exist in the philosophy of "Langga" with Gorontalo architecture. The review of the relation between the content of meaning in the "Langga" philosophy with Gorontalo architecture in the community settlement on some architectural elements, such as the mass structure of each building, shape, structure, organization space, color, ornament and orientation. The lack of written reference, supporting documentation and knowledge of the origin of "Langga" which became an obstacle to this research. Some of the obstacles encountered in this study led to the disclosure and tracing of the relationship between the "Langga" philosophy with Gorontalo architecture using a qualitative research paradigm so that the discussion of the philosophical problems of "Langga" and Gorontalos architecture can be understood. The holistic analysis is needed in this study to view objects within a cultural framework as well as a manifestation of a cultural system that includes the philosophy of "Langga".

Keywords
Gorontalo Architecture, "Langga" Philosophy, Settlement on Gorontalo Community

Topic
Architecture

Link: https://ifory.id/abstract/hyBqUTxnHpe8