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The Application of Numerical Simulation Result for Geothermal Financial Model with Probabilistic Approach: A Comprehensive study

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

作者： Nevi Cahya Winofa Ade Lesmana Heru Berian Pratama Nenny Miryani Saptadji Ali Ashat Petroleum Engineering Study Program Institut Teknologi Bandung Indonesia Geothermal Master Program Institut Teknologi Bandung Indonesia Jl. Ganesha No.10 Bandung West Java Indonesia Department of Earth Resources Engineering Faculty of Engineering Kyushu University. Fukuoka 819-0395 Japan

Feasibility of developing a geothermal project depends on the financial return generated from the investment. One of the strategies to achieve optimum return is formulating a financial model with a high level of confidence. Technical input parameters in the financial model are determined by the amount of available geothermal reserve in the form of a field development scenario. The best method for predicting geothermal reserve is a numerical simulation. The objective of this study is to determine the electricity tariff to generate 30 MW, 60 MW, and 110 MW which meet the 50% of the Rate of Return value will be equal or not exceed 16% (P50) for a specific geothermal field with a probabilistic approach. This study started with determining the technical input parameters: the number of production wells; makeup wells; and injection wells from each development scenarios based on numerical simulation result that has been studied by another researcher. The electricity tariff that meets the P50 of Rate of Return at 16% was calculated for those scenarios. Then, the tariffs were evaluated based on the Average Cost of Electricity Generation (BPP) on the relevant local grid. The result shows that the tariff or/and generation cost need to be negotiated. Moreover, total investment and economic indicators forecasting indicated that the investment was attractive. Lastly, sensitivity analysis shows that Rate of Return strongly affected by well drilling cost and power plant cost (EPCC).

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Preliminary Financial Modelling with Probabilistic Approach for Geothermal Development Project in Indonesia

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

作者： Ade Lesmana Nevi Cahya Winofa Heru Berian Pratama Ali Ashat Nenny Miryani Saptadji Geothermal Master Program Institut Teknologi Bandung Indonesia Petroleum Engineering Study Program Institut Teknologi Bandung Indonesia Jl. Ganesha No.10 Bandung West Java Indonesia Department of Earth Resources Engineering Faculty of Engineering Kyushu University. Fukuoka 819-0395 Japan

The right of geothermal field concession in Indonesia is obtained by tender as per Law No. 21/2014 Article 18. In the submitted proposal, the developer candidates shall mention the plan of field development strategy, while available data is limited due to a preliminary survey or preliminary survey and exploration were just performed. Then the developer candidates must be able to formulate the financial condition of the project so that the field utilization not only sustains but also produces appropriate profits. This paper discussed some regulations which are related to the economics of geothermal development project in Indonesia and a simple example of financial modelling with a probabilistic approach using Microsoft Excel Monte Carlo simulation and analysis tool. The input data were some technical assumptions such as installed capacity, steam fraction, steam specific consumption (SSC), well's capacity, well's success ratio, and financial assumptions such as well's price, power plant construction's cost, operation and maintenance cost, and others. The output of modelling were NPV (Net Present Value), IRR (Internal Rate of Return) and parameters that were sensitive to both values, whether financially or technically. The result of simulation showed from the financial aspect, wells and power plant cost were the most sensitive parameters in IRR calculation, while well's capacity and steam fraction were the most sensitive parameters from the technical aspect.

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System Design Teaching Model in Informatics engineering study program

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Journal of Physics: Conference Series 2019年第1期1165卷

作者： C E Supriana Informatics Engineering Study Program Faculty of Engineering Pasundan University Bandung Indonesia

Design teaching which is part of the system development life cycle, both information systems and application systems is very important to be taught, learned and understood in the informatics engineering study program. System design teaching in private universities in Indonesia whose students are very diverse in terms of abilities and skills require teaching materials, lecture strategies, quality of lecturers and facilities that must also be able to adapt to the challenges and complexity in teaching. The study of system design teaching uses Hevner's information systems research framework which includes the steps of constructing artifacts in the form of constructs, models, methods, instances and evaluation of artifacts using case study in informatics engineering lecture. The use of the framework is intended to support business strategies and processes in study programs and to ensure the relevance of research. The result of research is a model and evaluation of the model. First, this research will produce a system design teaching model that can be used as a reference in the informatics engineering study program to produce graduates with good literacy, skills using the stages of system design, understanding user needs and system design capabilities. Second, evaluating the model that has been built by applying it to the case study on human computer interaction lecture and measuring the results of lectures to improve the quality of lecture material, teaching and students.

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Maintenance Management Of Welding engineering Workshops In Vocational High Schools Inspecial Region Of Yogyakarta

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Journal of Physics: Conference Series 2019年第1期1273卷

作者： Tri Jarwono Aan Ardian Mechanical Engineering Education Study Program Faculty of Engineering Yogyakarta State University

This study aimed at investigating the maintenance management of welding engineering workshops and factors affecting the damage of welding equipment in vocational high schools located in Special Region of Yogyakarta. The study employed quantitative descriptivedesign. It was conducted at vocational high schools SMKN 1 Sedayu, SMKN 2 Pengasih, SMK Muhammadiyah 2 Wates, and SMKN 1 Pundong. The respondents were heads of workshops, teachers of welding engineering subject, workshop technicians, and students. The data were collected through survey, observation, and interview. The quantitative descriptive technique was employed to analyze the collected data. The results of the study show that the maintenance management of welding engineering workshops in some VHS in Yogyakarta is Very Gooddespitesome problemsin the maintenance procedure. The factors causing the equipment damage are the unscheduled maintenance procedure, absence of inventory lists, lack of technicians, improper use of workshop equipment, and the limited amount of maintenance budget.

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Facies and Architectural Element Analysis of Braided Fluvial Succession: The Tertiary Sawah tambang Sandstone, Sawahlunto, Indonesia

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Journal of Physics: Conference Series 2019年第1期1363卷

作者： U. K. Gusti B.K. Susilo Geological Engineering Study Program Faculty of Engineering Sriwijaya University Palembang Indonesia

The Sawahtambang Sandstone Formation of Sawahlunto, Indonesia has hitherto never been studied in detail to ascertain its depositional processes and its palaeoenvironment. The Sawahtambang Sandstone has more than 394 m thickness which consists of conglomeratic sandstone, sandstone, and clay-silt intercalation within which six lithofacies types (St, Sp, Sh, Ss, Fl, and Fm) appear creating iterated fining upward sequence. Herewith, this paper aims to replenish the avantgarde sedimentological interpretation of the Sawahtambang Sandstone in the intermontane basin of Indonesia based on outcrops along the Trans-Sumatra Highway. The study is attained through facies identification based on stratigraphic measuring section or outcrop profile, studio analysis consists of log analysis and superposition reconstruction, and architectural element delineation according to facies association. Structures in clay-silt facies consist of lamination and fissile whereas in the sand grained include planar and trough cross-bedding, planar lamination and granule lag, which depicts a lower-flow-regime sand channel. The architectural elements that made from facies association are identified into five distinct elements (multi-storey channel, single storey channels, sand bedforms, laminated sand sheet, and floodplain fines), which present a fluvial environment. The relation of the architectural elements demonstrates that the Sawahtambang Sandstone uphold a record of the braided river system that flowed from southwest to northeast in the southwestern part of Ombilin Basin. The dominance of coarse-grained (channel and sandy bedform) element over clay-silt grained (laminated sand sheet and floodplain fines) element and the extensive appearance of thick amalgamated channel elements reinforce the interpretation of a low-sinuous braided fluvial system in which the stacking pattern shows the channel bodies accumulated both lateral via lateral accretion of point bar and via vertical amalgamated streams.

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Developing a Manual Arc Welding Job Sheet for the Basic Welding Technique Subject

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Journal of Physics: Conference Series 2019年第1期1273卷

作者： Galih Adityawan Riswan Dwi Djatmiko Mechanical Engineering Education Study Program Faculty of Engineering Yogyakarta State University

The study aims to describe (1) the development stages of the manual arc welding job sheet and (2) its validity. It is a Research and Development (R & D) of which the data were collected by means of non-test instruments, namely the closed-ended questionnaires with the 5-scale responses. The data were collected from the three research participants acting as the material and media experts,namely two lecturers in the Mechanical engineering Education study program, faculty of engineering (FE), Yogyakarta State University (YSU), and a teacher of the Basic Welding Technique subject. The job sheet development stages were adapted from Thiagarajan's model, namely the Four-D model covering the definition, design, development, and dissemination. Data were analyzed quantitatively by means of the descriptive statistics. The results of the material evaluation by the material expert I prove that the job sheet is categorized as Appropriate (with the total score of 145 or 82.9%) and Very Appropriate based on the material expert II with the total score of 153 (87.4%). Besides, in terms of the media, the job sheet is Appropriate based on the media expert I (with the total score of 207 or 82.8%) and Very Appropriate based on the media expert II (with the total score of 215 or 84.4%).

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A Non-Linear Method for Hypocenter Determination around Central and East Java Region: Preliminary Result

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Faiz Muttaqy Andri Dian Nugraha Nanang T Puspito Pepen Supendi Shindy Rosalia Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Agency for Meteorology Climatology and Geophysics (BMKG) Bandung Indonesia

Java Island is highly active tectonic zone and also has a complex geological system as a result of Indo-Australian plate that subducted under the Eurasian plate. This complexity produces many large and destructive earthquakes. Moreover, Java is a most densely populated region in Indonesia. The precise earthquake location can define and evaluate the seismic hazard in the area. In this study, we determined hypocenter location around the central and east Java region by using a non-linear method. We manually picked P-and S-wave arrival time recorded by BMKG network for the time period of 2009 to 2017. We used the minimum 1D seismic velocity model of ak135 to locate the events. We used some criteria for the determination of event location including (i) at least recorded by 4 station which has clear onset P and S arrival, and (ii) has magnitude (MW) > 3. The seismicity in the study area is controlled by subduction and many active faults distributed along the Java Island, also clustered in several areas such as Kendeng thrust, Opak river fault, Kebumen, Banyuwangi, and others. The result of this study indicates the accurately main shallow seismicity zones in central and eastern part of Java region, and also confirm the presence of active inland faults. As further studies, we will conduct 1D velocity modeling and relocate the hypocenters using an updated local 1D velocity model beneath the study area.

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The Implementation of Occupational Safety and Health (OSH) in Practical Courses of the Electronics engineering Education study program, faculty of engineering, Yogyakarta State University

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Journal of Physics: Conference Series 2018年第1期1140卷

作者： M Munir S A Dewanto B Wulandari Electronics Engineering Education Study Program Faculty of Engineering Yogyakarta State University Indonesia

Occupational Safety and Health (OSH) is a part of the practical courses in educational institutions. This research was aimed at investigating: (1) students' knowledge of OSH used in practical courses, (2) students' attitudes toward OSH, and (3) the implementation of OSH in practical courses in the Electronics engineering Education study program, faculty of engineering, Yogyakarta State University. It is a non-experimental study employing a quantitative descriptive approach. This study was conducted in the Electronics engineering Education study program, faculty of engineering, Yogyakarta State University from February to June 2018. The subject of this study included students, lecturers, and technicians. Students' knowledge of OSH in practical courses in the Electronics study program is good (74.2%). Their attitudes toward OSH are also good (92.2%). Although some students do not implement OSH procedures when conducting practical courses, the implementation of OSH in the study program is categorized good (63.3%). Furthermore, more intensive studies on the importance OSH implementation in practical courses needs to done.

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Estimation of energy and organic fertilizer generation from small scale tapioca industrial waste

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IOP Conference Series: Earth and Environmental Science 2019年第1期230卷

作者： U Hasanudin M E Kustyawati D A Iryani A Haryanto S Triyono Study Program of Agro-industrial Technology Faculty of Agriculture University of Lampung Lampung Indonesia Study Program of Chemical Engineering Faculty of Engineering University of Lampung Lampung Indonesia Study Program of Agriculture Engineering Faculty of Agriculture University of Lampung Lampung Indonesia

The main of tapioca industrial wastes are cassava fiber, cassava skin, and wastewater. To increase the revenue of tapioca industry, cassava fiber was also extracted to produce energy and the effluent of biogas plant was utilized as organic fertilizer. The aims of this research were to estimate energy generation from tapioca wastewater and cassava fiber and also to estimate Nitrogen and Phosphorous potential from the effluent of biogas plant. This research was conducted in a tapioca factory which was equipped with biogas plant, in Lampung Province, Indonesia. Concentration of COD (Chemicals Oxygen Demand), Total Nitrogen (TN) and total Phosphorous (TP) were measured in the inlet and outlet of biogas plant. Enhancement of biogas production from cassava fiber was also estimated. Flow rate of wastewater and cassava fiber production were also measured. Wastewater generation is 2.75 m3/ton of cassava with COD 9,647.5 mg/l. Electricity production was estimated about 29.96 kWh and 30.44 kWh per ton of cassava from the wastewater and cassava fiber, respectively. The observed tapioca factory could be fulfilling energy needs for drying tapioca process if they utilized wastewater and cassava fiber. The effluent of biogas plant also still has potential to produce about 1.15 and 0.05 kg of TN and TP per ton of cassava, respectively.

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Edge Preserving Filter to Support PSF Estimation of Scanning Electron Microscope Images

Edge Preserving Filter to Support PSF Estimation of Scanning...

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International Conference on Instrumentation Control and Automation (ICA)

作者： D. Aldi Dwika M. Octariawan Fauzan Damar Rastri Adhika Suprijanto Program Study of Engineering Physics Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia Research Center for Nanoscience and Nanotechnology Institut Teknologi Bandung Bandung Indonesia Research Group of Instrumentation and Control Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia

Scanning Electron Microscope (SEM) is an instrument that used to observe the surface of an object at a scale of nanometer. However, image degradations caused by blur and noise may be occurred on SEM observation images. Its problems limit the process of observing and quantification problem for subsequent image analysis and visualization. To mitigate problems on blur, an estimation of point spread function (PSF) for specific SEM experiment become challenging, due to noise on a measured image. In the work, an edge preserving filter based on spatial and frequency domains are used for support PSF estimation. The performance of proposed scheme is evaluated for SEM images that acquired using Hitachi SU3500. An object TEM grid is imaged using SEM parameters, i.e. accelerating voltage 30 kV, spot size 10, 20, 30, and 40 with magnification 350 times. The results shown that proposes scheme can be confirmation that estimation PSF has characteristic increasing a radius in x-y plane as proportional with increasing spot size of electron beam.

关键词： Scanning electron microscopy Estimation Image edge detection Information filters Frequency-domain analysis Image resolution

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