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Geological hazard potential in Bukit Barisan Selatan National Park (BBSNP) using fault fracture density map and integrated geological aspects

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AIP Conference Proceedings 2023年第1期2482卷

作者： Alviyanda Rezky Naufan Hendrawan Bilal Al Farishi Daniel Radityo Imam A. Sadisun 1Geological Engineering Program Study Institut Teknologi Sumatera Indonesia 2Research and Innovation Center for Geoscience and Mineral Technology Institut Teknologi Sumatera Indonesia 3Faculty of Earth Science and Technology Institut Teknologi Bandung Indonesia

Sumatra Fault as product from tectonic events in Sumatra is the boundary between west and east blocks. Sumatra Fault reactivation could be generated several hazards, especially in Bukit Barisan Selatan National Park (BBSNP). Morphology of Sumatra Fault dominated by hill pattern variations from hill shade form, which should be delineated. The hazard potential has been identified by fault fracture density method combine with geological map and earthquake map. This research used ASTER GDEM and Regional Geology Map as basic data. Lineament interpretation is carried out on drainage map, DEM, and structural geology map. Earthquake data refer by earthquake history occurred near Sumatra Fault and subduction zone in western of Sumatra Island. The earthquake from Sumatra Fault potentially triggers landslide and liquefaction around BBSNP area. There is three regions as having geological hazard potential by Sumatra Fault movement, namely earthquake, landslide and liquefaction. Landslide will be collapsed relatively to the south and affected the main road of BBSNP. Furthermore, in eastern part of Sumatra Fault has liquefaction potential in Semaka and Suoh districts.

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Analysis of red chilli drying kinetics affected by low-temperature long time blanching

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IOP Conference Series: Earth and Environmental Science 2021年第3期807卷

作者： N Lestari Samsuar Agricultural Technology Education Study Program Faculty of Engineering Universitas Negeri Makassar Makassar Indonesia Department of Agricultural Engineering Faculty of Agriculture Hasanuddin University Makassar Indonesia

The drying kinetics of red chillies in the effect of low-temperature long time blanching were investigated. The blanching process was carried out at 70 °C for 10, 15, and 20 minutes. The drying process lasts for 32 to 35 hours to reduce the moisture content from 82.24% (wb) to 8.84% (wb). The experimental data were fitted to three mathematical models of thin-layer drying, namely the Henderson and Pabis, Lewis, and Page models. The result shows that the Page model is the most suitable model for predicting moisture ratio in chilli drying with low-temperature long time blanching treatment. This suitability is evidenced by the highest R2 value, which ranges from 0.9709 to 0.9786, and also the lowest RMSE and MBE values range from 0.0503 to 0.0579 and 0.0025 to 0.0034, respectively. Meanwhile, the effective moisture diffusivity varies from 5.6300 × 10−9 m2/s to 6.5662 × 10−9 m2/s for the treatments studied.

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A simulation of R32 refrigerant mixing with R1270 to reduce GWP R410A on wall mounted air conditioning

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IOP Conference Series: Materials Science and engineering 2021年第6期1098卷

作者： W Widodo B F T Kiono S H Winoto M S K T S Utomo Doctoral Study Program in Mechanical Engineering Faculty of Engineering Diponegoro University Jl. Prof Soedarto SH Tembalang Semarang 50275 Indonesia

Refrigerant R410A is a cooling barrier that is still widely used for air conditioning. This R410A contains the Fluoro element which can increase the value of GWP. In this research simulation, we used an AC unit using R410A with the aim of reducing GWP (Global Warming Potential) by mixing synthetic refrigerant with hydrocarbons. R410A still has content GWP: Mixing using R32 / R1270 refrigerant is predicted to reduce the GWP value because R1270 is one of the hydrocarbon refrigerants that has a GWP value of only: 3. By using Refprop software it can be simulated a mixture composition starting from 50/50, 40/60, 30/70, 20/80 and 10/90. From the results of the mixture simulation conducted, obtained a mixture approaching the characteristics of R410A, namely in the mixture: 20/80 with COP: 5.17 while R410A: 4.12. Compression ratio: R410A: 2.0 and for mixed refrigerants 20/80: 1.9. The refrigerant effect of mixed refrigerants is 20/80: 254,51, R410A: 162,77. Using this refrigerant mixture can reduce the GWP value and improve the performance of the AC cooling system. This refrigerant has considerable potential to replace the R410A.

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Correlation analysis to the linear factors on layer egg demand

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AIP Conference Proceedings 2023年第1期2628卷

作者： A. R. Siregar P. Astaman M. Darwis A. Ahmad D. M. Raisa Department of Socio-Economics Faculty of Animal Husbandry Universitas Hasanuddin Makassar Indonesia Agribusiness Study Program Faculty of Agriculture Muhammadiyah Sinjai University Sinjai Indonesia Research and Development Centre of Dynamics Community Culture and Humanities Institute for Research and Community Services Universitas Hasanuddin Makassar Indonesia Faculty of Engineering and Business Muhammadiyah Sinjai University Sinjai Indonesia

The study aimed to analyze how strong the relationship between egg demand and linear factors is. Chicken eggs have a contribution of animal protein for the community, so their existence needs to be maintained. The study was conducted in Biringkanaya District, Makassar City which was selected purposively by considering this area has the largest population. Sampling was carried out by proportional random sampling method, in 5 regions that had the largest number of households, so that the number of respondents who were considered capable of representing the total population was 50 respondents. The results showed that the tested variables X and Y variables had a significant correlation, which was supported by the F Change value of 0.001, so the null hypothesis (H0) was rejected and the alternative hypothesis (Ha) was accepted. Meanwhile, there is simultaneous multiple correlations between the independent variables, the price of layer eggs (X1), the price of chicken meat (X2), the price of tempeh (X3), the price of tofu (X4), and income (X5). and the dependent variable demand for layer eggs (Y) has a strong and positive relationship seen from the correlation coefficient (R) of 0.615.

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Measurement analysis of the level of household preparedness for facing landslide in Bogor regency

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IOP Conference Series: Earth and Environmental Science 2021年第1期708卷

作者： P D Saputra C Rahmawati K S H Purnomo E Larosa Nurhasanah Military Building Construction Engineering Study Program Faculty of Military Engineering Indonesia Defense University Bogor Indonesia Industrial Engineering Department Faculty of Industrial Technology Universitas Dirgantara Marsekal Suryadarma Jakarta Indonesia Master of Management Program Universitas Teknologi YogyakartaYogyakarta Indonesia Mechanical Engineering Education Faculty of Teacher Training and Education Universitas Negeri Yogyakarta Yogyakarta Indonesia Civil Engineering Study Program School of Engineering & Technology Tanri Abeng University Jakarta Indonesia

There are so many areas in Indonesia that are prone to landslides. Bogor is the regency with the most frequent landslides. Therefore, high community preparedness is needed to deal with the landslide, especially at the household level because it is the spearhead of preparedness and influence disaster risk. The objective of this research is to measure and analyze the level of household preparedness for facing landslide. The location of this research is in Cibadak Village, Bogor regency where a landslide disaster had happened. This is a quantitative research. The number of the samples were 100 household. Data collection was done by surveying samples and distributing questionnaires. The data would be analyzed with descriptive analysis, and the results of level of household preparedness would be categorized to five levels which were very prepared (80-100), prepared (65-79), almost prepared (55-64), less prepared (40-54), and not prepared (0-39). The results of the research are the average index value of Knowledge and Attitude (KA) parameter is 66.77, Emergency Planning (EP) parameter is 52.24, Warning System (WS) parameter is 64.80, Resources Mobilization Capacity (RMC) parameter is 51.25 and the level of household preparedness for facing landslide is 59.26 or and it is significant at the almost prepared level.

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The effect of interval of application of Nicotiana tabacum extract on growth parameters of Oryza sativa Inpari-32

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AIP Conference Proceedings 2022年第1期2534卷

作者： Dadang Sumardi Raden Adistie Parasati Rijanti Rahaju Maulani Sony Suhandono Andre Fahriz Perdana Harahap Misri Gozan 1Agricultural Engineering Study Program School of Life Sciences and Technology (SITH) Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung 40132 Indonesia 2Department of Chemical Engineering Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok 16424 Indonesia

The domestic consumption of rice (Oryza sativa) in Indonesia are increasing because of the population growth. One of the ways to increase rice productivity is by using external compounds such as plant growth regulators (PGRs) or phytohormones that function to affect growth. Tobacco plants can also be used as PGR because they contain allelopathic substances, organic matter, and other phenolic compounds that can affect plant growth. This study aims to determine the effect of intervals of tobacco extract application on the growth and yield of rice plants of the Inpari 32 variety. The study was conducted in a Randomized Block Design (RBD) with 4 interval treatments (control F0; once a week F1, once every two weeks F2, and every three weeks F3). One-Way ANOVA test was done at a 5% level and continued with a DMRT test, with variables of plant height, number of leaves, number of tillers, growth rate, phytohormones (auxin IAA; and gibberellic acid GA3), flowering age, harvest age, shoot and root dry weight, stover shoot root ratio, 1000 grain weight, the ratio of pithy rice grain to rice grain. Total, seed weight per clump, grain weight per plant, and productivity (tons/ha). The study results were that the application interval treatment did not show a significant effect on all test parameters, but the treatment interval of application of tobacco extract once a week (F1) showed a tendency for better results especially in the number of leaves.

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The combination effect of concentration and application interval of Nicotiana tabacum extract on growth of Oryza sativa Inpari 32

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AIP Conference Proceedings 2022年第1期2534卷

作者： Rijanti Rahaju Maulani Dhaifan Dito Adrian Sony Suhandono Muhammad Yusuf Arya Ramadhan Misri Gozan Dadang Sumardi 1Agricultural Engineering Study Program School of Life Sciences and Technology (SITH) Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung 40132 Indonesia 2Department of Chemical Engineering Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok 16424 Indonesia

Rice is a commodity which production continues to be increased in Indonesia due to the increasing demand and consumption per capita. The use of intensive agriculture and inorganic fertilizers that leave residues on the land makes fertilizers ineffective. Tobacco plants commonly used as pesticides can be used as organic materials that can increase rice growth because they contain nutrients and various allelochemical compounds. This study aims to determine the effect of tobacco extract application at various concentrations and interval combination treatments on growth parameters consisting of plant height rate, number of tillers, number of leaves, root dry weight, shoot dry weight, shoot-root ratio, flowering period, and the concentration of phytohormones (IAA and GA3) in rice (Oryza sativa) variety Inpari 32. The study was conducted by the application of tobacco extract consisting of 9 treatments which were a combination of concentration (1-3ml/L) and intervals application (1x in 1-3 weeks) and one control (without the administration of tobacco extract) for a total of 10 treatments, with three replications of each treatment. The results showed that the combination of concentration and interval of applications of tobacco extract had no significant effect on the parameters of plant height, tiller number, leaf number, shoot dry weight, flowering period, and phytohormones (IAA and GA3) concentrations in rice (Oryza sativa) Inpari 32 variety, and affect the parameters of dry root weight and shoot-root ratio slightly.

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Pre-feasibility study of Condensing Wellhead Generating Unit Utilization in Partially Vapor Dominated System

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IOP Conference Series: Earth and Environmental Science 2020年第1期417卷

作者： M A Dahlan H B Pratama N M Saptadji Petroleum Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Geothermal Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung West Java Indonesia. 40132

The development of geothermal fields needs 5-6 years from the first well drilled until the operation of the central power plant. Between the gap years, the wells will be shut in and will be re-opened when the power plant is ready. However, there is an alternative to utilize the wells with Wellhead Generating Unit (WGU), the small power plant which can generate the electricity as soon as the drilled productive wells completed. Then, the objective of this study is to decide the preferable scheme for the installed capacity of WGU with economic consideration. Correspondingly, this study uses two full factorial experimental design with Monte Carlo simulation to calculate and design the condensing turbine. Steam fraction, mass flow rate, turbine inlet pressure, and turbine exhaust pressure are the parameters to be analyzed in the Monte Carlo Simulation. The economic feasibility of the project is based on capital expenditure, decline curve analysis, and electricity price. The result of probability, P10, P50, and P90 of gross power output and Specific Steam Consumption (SSC) are 6.1, 7.9, 9.9 MWe and 1.85, 1.89, 1.93 kg/s/MWe respectively. Based on the economic evaluation, the P10, P50, and P90 of Internal Rate of Return (IRR) and Net Present Value (NPV) are 12%, 16%, 21% and 1.1 MUSD, 3.6 MUSD, 6.0 MUSD respectively over 30 years of WGU lifetime. This paper is the first study for designing the WGU combined with an economic study based on the technical evaluation to propose the best option to develop the field.

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Performance Evaluation of Geothermal Power Production Using EES (Case study Ulumbu Geothermal Power Production Unit 4 East Nusa Tenggara, Indonesia)

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IOP Conference Series: Earth and Environmental Science 2021年第1期732卷

作者： Prajamukti Ediatmaja Prihadi Setyo Darmanto Dimas Taha Maulana Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia

Ulumbu geothermal working area (GWA) is in Ruteng district, East Nusa Tenggara province, Indonesia. Ulumbu GWA is owned by PLN. There are four geothermal power plants (GPP) in Ulumbu, which capacity 4 x 2.5 MW. It has operated since 2013. Steam used to generate electricity comes from ULB-2 production well. Wellhead temperature and pressure were 180-200°C and 11 bar. Ulumbu GPP Unit 4 uses a condensing type turbine. It has specific steam consumption (SSC) during commissioning around 9.8 T/MW. After 6 (six) years of operation, SSC becomes 10.04 T/MW on average. It gives a chance to perform optimization in the GPP's equipment. Before performing optimization, evaluation for every equipment based on as-built data is done by modeling using EES software. The method of evaluation is performed by thermodynamics analysis in each GPP's equipment. EES is chosen due to its simplicity to arrange many equations in a single window. EES could communicatively display calculation results through a parametric table, solution window, and diagram window. Operation data give information that turbine inlet pressure is operated under its specification. Turbine inlet pressure is operated under its specification because of the change of operating wellhead pressure. Non-Condensable Gas (NCG) content also decreases based on the last ULB-2 well fluid sampling. Using EES, parameter changes in turbine inlet pressure and NCG content are simulated to get optimum power generation value. The simulation results indicate that optimum turbine inlet pressure is obtained at 9.3 bar with SSC 9.17 T/MW. Ulumbu GPP Unit 4 that operated in that condition could reach cycle efficiency of about 10.39%.

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The influence of sintering temperatures and sizes of dolomite foaming agent on porosity of Mg-6Zn alloy

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AIP Conference Proceedings 2024年第1期3003卷

作者： Bintoro Siswayanti Galih Senopati Aprilia Erryani Fanciska Pramuji Lestari Ika Kartika Lalu Suhaimi Gustini Dian Lestari Research Center for Metallurgy National Research and Innovation Agency (BRIN) KST B.J Habibie Gedung Manajemen 720 South Tangerang Banten 15314 Indonesia Sumbawa University of Technology Faculty of Engineering Metallurgical Engineering Study Program Jl. Raya Olat Maras Batu Alang Moyo Hulu Pernek Kec. Moyo Hulu Kabupaten Sumbawa Nusa Tenggara Barat 84371 Indonesia

Magnesium alloys like one of the bioabsorbable implant materials expected to help heal tissue without implant residues, therefore are no need to take the implant for a second surgery. One of the expected performances of metal implants is its ability to support cancellous bone growth, namely porous bone that encloses large spaces and has a spongy nature or appearance, therefore metallic magnesium foams are used in bone implants to approach the natural structure of bones. This study aims to evaluate the effect of dolomite (CaMg(CO3)2) size as a foaming agent to produce porosity on Mg-6Zn alloy. Powder metallurgy is used to produce metallic magnesium foams. Magnesium powder 0.06-0.3 mm granulometry mixed with zinc powder <63 µm granulometry and dolomite powder with varying sizes 20, 25, and 30 mesh. The mixed powder was compacted and sintered at varying temperatures of 650, 675, and 700°C. The smallest porosity is found in the Mg6Zn10CaMg(CO3)2 alloy with a #25 mesh foaming size and a sintering temperature of 650°C, or 10.77%. Meanwhile, the highest porosity was found in the mesh alloy Mg-6Zn-10CaMg(CO3)2 #20 with a sintered temperature of 700°C, or 53.26%. These results indicate that the higher the sintering temperature in the alloy, the greater the percentage of pores formed and the smaller the density value produced in the alloy.

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