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Performance analysis of a standalone hybrid renewable electric generation system during fault condition

Journal of Physics: Conference Series 2019年第1期1375卷

作者： A Pradipta I Sunaryantiningsih Electrical engineering study program Engineering faculty Universitas PGRI Madiun Madiun East Java Indonesia

There are several problems or disruptions to the hybrid system, including the availability of limited energy sources, transient conditions when some power plants or loads enter the system or out of the system and short circuit interruptions. The hybrid system used for testing includes photovoltaic system (PV), wind power generation system (WTGS), battery energy storage system (BESS) and load. The system is integrated on the DC bus. Testing for each interference condition is performed after the system is integrated. The parameters seen in this hybrid system performance analysis test are DC bus voltages and currents from each renewable plant. The results of this test will be used as data for hybrid system improvement in future research.

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The spectrum of city park service scope: case study of Lapangan Puputan Badung and Lapangan Puputan Margarana Denpasar-Bali

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IOP Conference Series: Earth and Environmental Science 2019年第1期396卷

作者： N Kohdrata G A M Suartika A A K Krisnandika L S Yusiana I M A Dharmadiatmika Landscape Architecture Study Program Faculty of Agriculture Udayana University Bali Indonesia Architecture Study Program Faculty of Engineering Udayana University Bali Indonesia

This research aims to find the spectrum of a park service scope from two city parks in Denpasar, a densely populated city. The city parks in study are Lapangan Puputan Badung and Lapangan Puputan Margarana as city public facilities of Denpasar – Bali that is said to improve citizen quality of life and environment as well. However, this research focuses to see how city parks in Bali serve their users. This study uses a survey research method. Sample of respondents are chosen using accidental sampling technique with questionnaire as media of data collection. Data series include, users' age, frequency of visit, activities, and domicile. Research findings are analysed spatially and descriptively as well. Result shows that most visitors are young people who spend time mostly for exercising and other recreational activities. It is also interesting to see that both city park users are regular visitors. They visit the parks at least 1 to 2 time per week and spend 1 to 2 hours in there. The parks users mostly come from densely populated areas. That shows the importance of city parks as complement to a city. However, as a city that going to smart city, ICT has not been recognized much. As conclusion, the spectrum of city parks service scope of Denpasar still ranging in traditional functions of public green open space. A city park serves a man-made nature-like place for people to get refresh within an urban landscape setting.

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Parameter processes and their impact on Tinospora cordifolia stem extracts for antibacterial and antioxidant materials

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Materials Today: Proceedings 2023年

作者： Ahmad Royani Muhammad Hanafi Puspa Dewi N. Lotulung Muhammad Eka Prastya Chandrabhan Verma Akram Alfantazi Azwar Manaf Postgraduate Program of Materials Science Study Department of Physics Faculty of Mathematics and Natural Sciences Universitas Indonesia Depok 16424 Indonesia Research Center for Metallurgy National Research and Innovation Agency (BRIN) Tangerang Selatan Banten 15314 Indonesia Research Center for Pharmaceutical Ingredients and Traditional Medicine National Research and Innovation Agency (BRIN) Tangerang Selatan Banten 15314 Indonesia Research Center for Chemistry National Research and Innovation Agency (BRIN) Tangerang Selatan Banten 15314 Indonesia Department of Chemical Engineering Khalifa University of Science and Technology P. O. Box 127788 Abu Dhabi United Arab Emirates

This work extracted the Tinospora cordifolia stem for antibacterial and antioxidant materials. The stems of T. cordifolia were extracted by using a simple maceration method. The effect of three independent variables (solvent ratios, temperature, and extraction time) was investigated to obtain optimal conditions. Ten grams of T. cordifolia were extracted using a mixture of methanol–water ratios 00:100, 15:85, 30:70, and 45:55 (% v/v) at 50–95 °C for 0.5 to 3 h. The total phenolic and flavonoid content in the T. cordifolia extracts was analyzed by Folin-Ciocalteu and Colorimetric-AlCl 3 methods. The antibacterial activities against Pseudomonas aeruginosa were assessed by serial dilution methods, and antioxidant properties were performed by DPPH methods. The optimum condition was achieved at methanol–water ratios of 00:100 % (v/v) at 95 °C for 2 h. The yield extraction for this condition is around 13.97%. The total phenolic and flavonoid contents for these conditions are about 6.85% and 7.07%, respectively. The minimum inhibitory concentration value against P. aeruginosa is 1024 µg/mL, and the minimum bacterial concentration is above 2048 µg/mL. Meanwhile, the antioxidant obtained is 217.55 µg/mL at a ratio of 00:100 methanol–water. The extraction process parameters significantly influenced the phytochemical (TPC and TFC), antibacterial activity, and antioxidant properties of T. cordifolia stem extracts. This work clearly shows the antibacterial potential of T. cordifolia stem extracts, suggesting that more investigation is required to isolate the bioactive compounds in this extract.

关键词： Antibacterial Antioxidant Maceration Parameter effect P. aeruginosa T. cordifolia

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Design prototype of audio guidance system for blind by using raspberry pi and fuzzy logic controller

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Journal of Physics: Conference Series 2019年第1期1230卷 012024-012024页

作者： Ni’matul Ma’muriyah Yulianto, Andik Lili Electrical Engineering Study Program Faculty of Industrial Technology Universitas Internasional Batam

With almost 3.75 million people with visually impaired in Indonesia, according to statistical data shown that most of them not live in prosperity. To increase their productivity they need an assistive device that’s allows them to navigate freely. This paper presents a novel Audio guidance system for blind in the shape of simple bag with earphone for giving them an audio guidance efficiently and safety. Different with other audio guidance, we propose a simple system consist of Raspberry Pi Camera and Ultrasonic Sensor as input, Raspberry Pi, Earphone and Power bank. This system is initiated by providing a voice command of the direction where the blind person must walk or go through, so they can avoid from obstacles. We also apply Fuzzy Logic Controller (FLC) to detect the obstacles along they walk by using 3 ultrasonic sensors. The experimental result shows that by using FLC and interfacing by Raspberry Pi the proposed system can effectively to detect the obstacles and give direction with 2.32% distance error.

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Stability Improvement by Reducing Voltage Fluctuation using SVC in Penetration Wind Power System

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IOP Conference Series: Materials Science and engineering 2019年第1期676卷

作者： A Siswanto I C Gunadin S M Said A Suyuti Program Study of Electrical Engineering Universitas 17 Agustus 1945 Cirebon Department of Electrical Engineering Engineering Faculty Universitas Hasanuddin

Currently, wind energy is a renewable energy that is growing because some of its advantages are connected to the grid system. This study is focus on presenting a probabilistic theory to design power system stability (PSS) and excitation of the FACTS system controller generator via Static Var Compensator (SVC) connected to wind turbines in Sidrap, region of South Sulawesi system. The purpose of the test system is on oscillation, profile voltage and influence stability of wind turbine penetration. An oscillating system requires system performance compensation from the side of the machine via PSS and transmission via SCV to increase the depth of the electro mechanical mode. So, the simulation results on 44 buses in the South Sulawesi system show the stability of the system and rapid voltage improvement and can reduce the oscillation that occurs. This system is tested using a time domain-based PSAT software simulation on the system.

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Temperature and Salinity Gradients Analysis for a Solar Pond Prototype

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IOP Conference Series: Materials Science and engineering 2019年第1期676卷

作者： Z Muslimin I C Gunadin Muh Anshar A Siswanto Department of Electrical Engineering Engineering Faculty Hasanuddin University Electrical Engineering Study Program 17 Agustus 1945 Cirebon University

In this study, a solar pond prototype is used to analyze the temperature and salinity gradients of alternative energy source processes. The study used two types of solar pond to investigate the temperature and salinity of gradients from each solar pond. The first solar pond utilizes sunlight as a heat source that emitted directly on the solar pond and the second solar pond utilizes the spotlights as a direct heat source emitted on the solar pond. The first solar pond is made of a cylindrical plastic tank of 1.05 m tall, 0.8 m in diameter placed outdoors in direct sunlight and the second solar pond model is made of a trapezium plastic tank with a height of 0.9m, the upper diameter 0.54m and a bottom diameter of 0.49m placed indoors with floodlights. The gradient temperature salinity and temperature measurement in the fest solar pond are smaller than temperature in the second solar pond however, the T3 temperature in the outdoor solar pond is larger than the indoor solar pond. The observation results show that the first solar pond generates the mean value of temperature and salinity of successive gradients 32 (°C); 30 % and the second solar pond has the average value of temperature and salinity of successive gradients 31 (°C); 28 %.

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Feasibility and prospective analysis of logistics engineering study program as the demands of the digital business era

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IOP Conference Series: Materials Science and engineering 2020年第4期830卷

作者： R M Masri I M Purwaamijaya B M Purwaamijaya Civil engineering department Faculty of Technology and Vocational Education Universitas Pendidikan Indonesia West Java Indonesia Digital Business Study Program Tasikmalaya Campus Universitas Pendidikan Indonesia West Java Indonesia

The rapid development of information and communication technology will deliver the public to the changing era, including in the business industry. The global community is currently in a transition towards digital society which is characterized by intensive use of science, technology and humanities, integrated infrastructure that demands human resources to be able to creative and innovative in order to face the demands in the digital business era. The existence of these changes affect global trends in logistics business practices in the industry, including by the movement towards free markets and regional cooperation to expand markets. Market expectations also change as global competition in products and services pushes for higher standards, lower costs and increasingly diverse choices of customers in the market. Research is needed with a comprehensive qualitative approach, mechanism, and exploration of needs to be anticipated by university to become a center of excellence and contribute to the real world by producing human resources that have strong character and integrity accompanied by the ability to innovate and utilize their digital knowledge to be able to work and win competitions in the global business industry, both as practitioners and academics, one of them is by opening a logistics engineering study program by focusing on e-logistics that suits market needs.

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Wet oxidation pretreatment effect for enhancing bioethanol production from cassava peels, water hyacinth, and green algae (Ulva)

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AIP Conference Proceedings 2020年第1期2255卷

作者： Yaovi Sylvestre Ahou Margareta Novia Asih Christami Sary Awad Cindy Rianti Priadi Lamine Baba-Moussa Setyo Sarwanto Moersidik Yves Andres 1IMT-Atlantique GEPEA UMR CNRS 6144 Nantes France 2Laboratory of Biology and Molecular Typing in Microbiology LBTMM UAC Benin 3Environmental Engineering Study Program Department of Civil Engineering Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia 4Tropical Renewable Energy Center (TREC) Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia

Biomass pretreatment is the most important yet challenging process in biofuel production, with the aim of making part of the biomass more accessible for further treatment. There are four fundamental types of pretreatment techniques employed for bioethanol production: physical, chemical, physicochemical, and biological. Wet oxidation (WO) in fact is known to be one of the most effective pretreatments to liberate more cellulose from lignocellulosic material by heating, in purpose of reducing acid usage in the bioethanol process. The effect of two different conditions of WO pretreatment on fractionation cassava peels, Ulva algae, and water hyacinth was investigated. WO resulted in an increase of carbohydrate content of lignocellulosic residues as a result of the solubilization of cellulose and hemicellulose. The highest carbohydrate content of 1.5g/L was obtained in the pretreatment at 125°C, 45 min, 1.5 bar pH3 for water hyacinth. The pretreatment efficiency was 95%. Changing the pretreatment operating conditions to 130°C, 75 min, 1.8 bar and pH1 allowed to yield high carbohydrate from cassava peel and Ulva algae in respective proportion of 2.38g/L and 1.83 g/L. The WO efficiency was respectively 63% and 95% for cassava peels and Ulva algae. Ethanol yields in respective proportion of 0.26 g/l; 0.31 g/l and 0.2 g/l from Ulva algae, cassava peel and water hyacinth showed the optimum condition of *** enzymatic convertibility of glucose to ethanol.

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Effect of contact surface temperature on wear of nickel-chromium layer

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AIP Conference Proceedings 2019年第1期2187卷

作者： I. M. Widiyarta I. M. Parwata I. P. Lokantara Dwipayana 1Study Program of Mechanical Engineering Faculty of Engineering Udayana University Indonesia 2Magister of Mechanical Engineering Faculty of Engineering Udayana University Indonesia

In sliding contact of two components, the contact temperature will be generated due to the friction force and this may weaken the material and cause the material to be less resistance to fail by wear. However, the generated temperature may develop oxide layers at the surface and thus may protect the material to fail by wear. In this work, the contact surface of the material of the medium carbon steel was coated with Nickel-Chromium in the process of flame powder spray coating. To determine the effect of the elevated temperature at the contact surface on the wear of the Nickel-Chromium layers, the wear test with the various temperatures of the surface was performed using the ball-on-plat wear test machine. The surface temperature was arranged in the range of 30, 50, 100, 150, 200, 250 and 300°C. The results show that the wear rate decrease from about 0.0347x10−3 to 0.0083x10−3 gr/m with increasing the surface temperature from 30°C to 50°C and increasing the surface temperature up to 300°C, the wear rate slightly fluctuated between 0.0023x10−3 and 0.0053x10−3 gr/m. This wear rate behavior occurred because of the oxide layers presented at the surface due to the elevated temperature.

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Petrophysics and rock physics using VTI model for low permeability and high porosity reservoir in CCS Gundih gas field pilot project, Indonesia

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

作者： Fatkhan H Danio L T Anggarini O A Mudatsir M R Sule Seismology Exploration and Engineering Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Geological Engineering Study Program Universitas Pertamina Indonesia Geological Engineering Study Program Institut Teknologi Bandung Indonesia

A pilot Carbon Capture and Storage (CCS) project in Indonesia is planned to be implemented in Gundih area, Central Java Province in Indonesia. Prior to conducting CO2 injection, reservoir characterisations have to study thoroughly to assure that the reservoir is to meet with CCS standard requirements. The Jepon well in the Gundih fied was proposed as a suitable site for CO2 injection. The decision was made to proceed with a comprehensive site assessment and geological modelling of the Jepon area. This site was selected based on the reason the presence of a potentially suitable reservoir (Ngrayong Sandstone) and primary and secondary seals (Bulu Limestone and Wonocolo claystone). Using logging data, petrophysics and rock physics model are used to evaluate potential of the CO2 injection site. Permeability results from petrophysics calculations and recent injection tests show very small; whilst porosity is relatively high. This can be caused by fractures mostly are not connected. Hence, rock physics for the reservoir is evaluated and modelled as anisotropy or Vertical Tranverse Isotropy (VTI) in which fractures with preferred orientation. Stiffness calculations for VTI medium with different aspect ratio shows consistent with low permeability result.

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