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Application of Numerical Simulation to Update Conceptual Model and Resource Assessment of Songa-Wayaua Geothermal Field

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

作者： Hikmatyar Ghassan Fariz Hasbi Muhamad Ridwan Hamdani Agung Budi Tri Prasetyo W Agung Reynaldi Khrisna Muhammad Jiehan Lampuasa Sutopo Heru Berian Pratama Todheus Welly Prabata Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia

A study of Songa-Wayaua geothermal field using TOUGH2 reservoir simulation was conducted. This study shows the workflow to update the Songa-Wayaua conceptual model based on geosciences data, and to assess its potential resource. Since this field still a green field, the model still has so many uncertainties because lack of the actual well data. The numerical simulation of Songa-Wayaua geothermal field has been developed and it showed a proper alignment with geosciences data but still requires validation from well data. This is the first numerical model of Songa-Wayaua geothermal field. The model provides additional insights which have been used to review and update the conceptual model. The conceptual model of Songa-Wayaua geothermal field has been successfully updated. The main updated points of the conceptual model were the location of the heat source to be beneath the Mt. Pele, adding the flow fluid pattern as outflow and upflow location, and adding iso-temperature distribution. By using the heat stored method with probabilistic approach (Monte Carlo Simulation), the resource calculation approximately 30 MWe.

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Human-computer-interface for controlling the assistive technology device

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AIP Conference Proceedings 2020年第1期2314卷

作者： Osmalina Nur Rahma Maydiana Nurul Kurniawati Akif Rahmatillah Khusnul Ain 1Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Airlangga University Indonesia

Imagining a motion without doing the actual movement is known as Motor imaginary (MI). However, translating MI as an input for BCI that control the Assistive Technology (AT) device was a challenging method due to the extensive training required, poor user engagement, and visual feedback response delays. For a person who has difficulties to imagine without visual stimulation, more training should be conducted. Even with a visual stimulus, sometimes a person still finds it hard to distinguish between one movement and another. So, finding a suitable input to control an AT device that suitable for someone who has extremely limited movement is very challenging. In the other hand, EEG signal had been proven sufficient in detecting facial expression. Even though the EEG signal contains EMG facial artifact and considered as an unwanted signal for BCI, facial movement artifact could become a compensator signal for EEG based Human Computer Interface (HCI) system to improve efficiency. This study aims to develop HCI systems to distinguish three different movements (forward, backward, and stop) EEG signals that recorded from EEG EMOTIV Epoc based on different facial expression. This HCI system could bring benefit if it is implemented for AT device, such as rollator since the user could easily distinguish different movement without any visual stimuli required so could reduce an extensive training before usage and could improve the quality of life people with limited extremity movement.

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Optimalization of ultrasonic tomography method using robotic instrument

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Journal of Physics: Conference Series 2019年第1期1204卷 012072-012072页

作者： Setiawan, Tedy Fatkhan Lawrens, Fernando Rahadi, Albertus Ariel Geophysical Engineering of Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia

Ultrasonic tomography is one of many non-destructive methods to image a rock by measuring wave velocities (P or S-wave). Some applications of ultrasonic tomography include research for seismic anisotropy, rock physics, shale gas etc. The objective of this study is to assess the ability of the robotic instrument to measure rock samples using ultrasonic tomography method. As we know that a conventional method are still employed to measure wave velocities in ultrasonic tomography. The conventional method measures a rock manually that it is often difficult and sometime takes quite long time. One of alternatives to cope with the problem is to design a robotic instrument. The robotic instrument is made of microcontroller and stepper motor. The microcontroller and stepper motor control the position of ultrasonic transducers while measuring the rock sample. The robotic instrument is not only able to measure but also have feedback controls. As a result, measured data can be more accurate and precise than those of the conventional method. Several rock samples are used for testing measurements using a MSIRT (Modified Simultaneous Iterative Reconstruction Technique) method. Results show that using the robotic instrument can enhance quality of data and reduce error up to 50%.

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Correction to: The effect of salinity on the interaction between microplastic polyethylene terephthalate (PET) and microalgae Spirulina sp

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Environmental science and pollution research international 2022年第5期29卷 7888页

作者： Hadiyanto Hadiyanto Muslihuddin Muslihuddin Adian Khoironi Wahyu Zuli Pratiwi Muthia'ah Nur Fadlilah Fuad Muhammad Norma Afiati Inggar Dianratri Center of Biomass and Renewable Energy (CBIORE) Chemical Engineering Department Diponegoro University Semarang Indonesia. hadiyanto@live.undip.ac.id. Graduate Program of Environmental Sciences School of Postgraduate Studies Diponegoro University Semarang Indonesia. hadiyanto@live.undip.ac.id. Center of Biomass and Renewable Energy (CBIORE) Chemical Engineering Department Diponegoro University Semarang Indonesia. Study Program of Environmental Health Faculty of Health Dian Nuswantoro University Semarang Indonesia. Graduate Program of Environmental Sciences School of Postgraduate Studies Diponegoro University Semarang Indonesia. Biology Department Faculty of Sciences and Mathematics Diponegoro University Semarang Indonesia. Department of Fisheries Faculty of Fisheries and Marine Sciences Diponegoro University Semarang Indonesia.

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Finite element analysis of posterior leaf spring ankle-foot orthosis for tibialis anterior atrophy case

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AIP Conference Proceedings 2022年第1期2663卷

作者： Alfian Pramudita Putra Arief Sofian Hidayat Akif Rahmatillah Pujiyanto Pujiyanto Dinda Cyberputri I. Putu Alit Pawana 1Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia 2Biomedical Signals and Systems Research Group Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia 3Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia 4Department of Rehabilitation and Physical Medicine Dr. Soetomo General Academic Hospital Surabaya Indonesia

Stroke is a neurological disease and is a significant cause of disability throughout the world. Patients with stroke or post-stroke usually still experience interference in walking in the form of a drop foot caused by atrophy of the anterior tibialis muscle, so they cannot perform dorsiflexion. Drop foot disorders can be treated by rehabilitation using Posterior Leaf Spring Ankle-Foot Orthosis (PLS AFO). PLS AFO has the advantage of a higher level of flexibility compared to other AFO types. The primary purpose of this research is to observe the level of resilience based on the influence of AFO thickness. This study uses the finite element analysis of three model variations in the initial contact, midstance, terminal stance, and calf loading phases. The material used in this study was carbon fiber. The simulation will result in the distribution of stress, strain, and deformation values in each AFO model. The simulation results show that AFO resistance is affected by variations in AFO thickness where the increase in strength is proportional to the increase in AFO thickness. The AFO with a thickness of 10 mm is the most suitable for the tibialis anterior atrophy case.

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Geology Assessment of Permeability Distribution in Silangkitang Geothermal Field, North Sumatra, Indonesia

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

作者： Drestanta Yudha Satya Suryantini Doddy Astra Sarulla Operations Ltd. 7th Floor the Energy Building SCBD Lot 11A Jakarta 12190 Indonesia Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia

The Silangkitang (SIL) geothermal system is a fault-controlled and liquid-dominated reservoir associated to a deep heat source. Geology data from recent development drilling and reservoir monitoring demonstrated that the high permeability is concentrated within zone between two strands of Great Sumatra Fault (GSF). These faults are major dextral strike slip system that cross the entire length of Sumatra Island. The fault distribution has been defined by integration and interpretation of tectonic geomorphology, surface geology, and well geology. The highest permeability is controlled by faults and fractures associated with localized releasing steps within west of main Tor Sibohi Fault (TSF). This paper outlines the indication of high permeability zone based on recent geology evaluation outcome.

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Numerical Simulation on Effects of TCO Work Function on Performance of a-Si:H Solar Cells 4th

Numerical Simulation on Effects of TCO Work Function on Perf...

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4th International Conference on Functional Materials Science, ICFMS 2018

作者： Sholih, Ahmad Hamdani, Dadan Wicaksono, Sigit Tri Hidayat, Mas Irfan Purbawanto Cahyono, Yoyok Darminto Advanced Materials Research Group Department of Physics Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo Surabaya60111 Indonesia Department of Materials and Metallurgical Engineering Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo Surabaya60111 Indonesia Physics Study Program Faculty of Mathematics and Natural Science Universitas Mulawarman Samarinda Indonesia

ISBN: (纸本)9783035714968

In this paper, we have investigated the effect of the work function of transparent conducting oxides (TCO) on the performance of a-Si:H p-i-n solar cells, including open circuit voltage (VOC), short circuit current (JSC), fill factor (FF) and conversion efficiency, using AFORS-HET software. The simulation has focused on two layers: front contact work function (ΦTCO-front) and back contact work function (ΦTCO-back) with various band energy gap from 4.7 eV to 5.3 eV and 4.2 eV to 4.9 eV respectively. From the simulation results, we know that the work function of TCO greatly affects the performance of solar cells such as Voc, Jsc, FF and conversion efficiency. By optimization, we arrive at results of Voc, Jsc, FF and conversion efficiencies of 0.88 V, 8.95 mA / cm2, 65% and 5.1% respectively, by using ΦTCO-front of 5.2 eV. When ΦTCO-front > 5.2 eV, the values of VOC, FF and conversion efficiency have been saturated, while the value of the J sc actually begins to decrease. Furthermore, when the ΦTCO-back is 4.3 eV, we get the best results for VOC, Jsc, FF and conversion Efficiency of 0.9 V, 8.96 mA / cm2, 73 % and 5.9 % respectively. When ΦTCO-back > 4.3 eV, the values of VOC, FF and conversion efficiency begin to decrease, while the value of the Jsc does not change significantly. These optimizations may help for producing low cost high efficiency p-i-n solar cells experimentally. © 2019 Trans Tech Publications Ltd, Switzerland.

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The potential use of Indonesian glutinous rice flour as nanoparticles organic filler for dental impression materials

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IOP Conference Series: Materials Science and engineering 2020年第1期1007卷

作者： V Takarini L A T W Asri R Suratman B K Hadi Materials Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia Dental Materials and Technology Department Faculty of Dentistry Universitas Padjadjaran Sekeloa Selatan 1 Bandung 40132 Indonesia Aerospace Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia

Indonesia as a third largest rice producer has glutinous rice as one of its natural resources, which can be used as the advantage in organic fillers production. Organic and inorganic fillers are commonly added to reinforce the mechanical properties of the polymer in impression materials. Organic fillers made from glutinous rice flour can be produced due to its high amylopectin content and unique characteristics of morphological and structural of the source plant. Moreover, it is abundant in production, low cost, non-toxic and biodegradable. However, this type of filler is not common in dental area, especially in impression materials. This study aims to exercise the probability of the use of organic fillers made from Indonesian glutinous rice as filler component of the viscosity the dental impression materials. Nano-size, morphology, and amount of glutinous rice organic filler shall affect the consistency of viscosity, which will be provided as light, medium, heavy body and putty consistency. The study can be used as a reference in the future research of Indonesian glutinous rice development for organic nanofillers production that could be used for dental impression materials reinforcement towards better mechanical properties.

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Ambient air monitoring of nitrogen dioxide at Kalimati, Tirtomartani, Kalasan, Sleman, Yogyakarta 2

Ambient air monitoring of nitrogen dioxide at Kalimati, Tirt...

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2nd International Conference on engineering and Technology for Sustainable Development, ICET4SD 2017

作者： Supriyanto Suci Ramadhani, Indah Environmental Engineering Department Faculty of Civil Engineering and Planning Universitas Islam Indonesia Jl. Kaliurang 14 Yogyakarta55584 Indonesia Study Program of Environmental Engineering Faculty of Civil Engineering and Planning Universitas Islam Indonesia Jl. Kaliurang 14 Yogyakarta55584 Indonesia

Nitrogen dioxide (NO2) is one of parameters in air quality according to Indonesia Government No. 41/1999. NO2 has influence in respiratory problem of human being if it exceeds threshold level (400 μgNO2/Nm3). This study is air monitoring of NO2 concentration in ambient air and it uses a Griess Saltzman method using the spectrophotometer (Indonesia Standard SNI 19-7119.2-2005) near of Plywood Industry and Main Road. The sampling location has two points at Kalimati Village, Tirtomartani, Kalasan, Sleman, D.I Yogyakarta. On December 2016, the results show which NO2 concentration is below threshold level with 0,469 μg NO2/Nm3 at first point and 0,234 μg NO2/Nm3 at second point. © The Authors, published by EDP Sciences, 2018.

关键词： Nitrogen oxides

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Design mixed formula of hot mix asphalt mixture very thin overlay using crumb rubber

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IOP Conference Series: Materials Science and engineering 2020年第1期821卷

作者： S Sunarjono P A Wijaya N Hidayati A Magfirona Civil Engineering Postgraduate Study Program Universitas Muhammadiyah Surakarta Surakarta Indonesia Transportation Research Center Faculty of Engineering Universitas Muhammadiyah Surakarta Indonesia

One of the technologies expected to improve the quality of flexible pavement is to use a modified asphalt mixture of Crumb Rubber (CR). The material can be used as a very thin added layer which is then called Very Thin Overlay Modified Crumb Rubber (VTO Mod-CR) and the functions as a leveling layer. This asphalt mixture is expected to have high durability and increase the age service life of flexible pavement. The aim of this study was to analyze the design mix formula (DMF) and the durability of the asphalt mixture. This research carried out variations of asphalt content i.e. 6.0%, 6.5%, 7.0%, 7.5% and 8.0% with each variation of 3 specimens for Marshall Test. Based on the DMF analysis results obtained optimum asphalt content of 7.00%, while the properties of the mixture in the form of bulk density of 2.240, VIM of 3.77%, VMA of 18.15%, VFA of 79.23%, Stability of 1049 kg, Flow of 3.47 mm, Marshall Quotient of 251 kg / mm, Bitumen Film Thickness 16.08 µm. The results of the analysis of the mixture properties have met specifications General of Highways, so it can be used as a reference for AMP. The BFT value obtained meets the minimum specification specifications of 16 µm, this shows that the resistance to water and oxidation is higher, so the pavement becomes durable.

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