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Analysis of the use of biogas fuel from palm oil waste as a gas engine (electrical generator)

AIP Conference Proceedings 2021年第1期2342卷

作者： Rahmad Samosir Budiarto Andreas Kristiawan Mechanical Engineering Study Program Faculty of Engineering Universitas Kristen Indonesia Jakarta Jl.Mayjen Sutoyo no.2 Cawang East Jakarta 13630 Indonesia

An analysis of the use of biogas fuel from palm oil waste has been carried out o produce mechanical energy, including moving generators that produce electricity. In this study two different types of gas are used, namely natural gas and biogas obtained from palm oil waste. This test aims to analyze what the impact of each gas on the performance of the gas engine both in terms of electricity output, fuel consumption and efficiency level. The low calorific value of natural gvvas is 9424 kKal / Nm 3 (39,458 kJ / Nm3 and from the test results the power generated is 10.169 kWh / Nm3 while for biogas the power is 6.062 kWh / Nm3, then the low heating value of biogas is 10.169 kWh / Nm3 while for biogas the power is 6.062 kWh / Nm3, then the low heating value of biogas is obtained. 5615 kJ / Nm3 40.32% lower than the low heating value (LHV) of natural gas. From the results of the analysis it was concluded that the biogas from palm oil waste fulfills the requirements as engine fuel.

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Preparation of Nanocellulose-Alginate Nanocomposites for Chlorhexidine Digluconate Drug Carrier 1

Preparation of Nanocellulose-Alginate Nanocomposites for Chl...

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1st International Conference on Design and Application of engineering Materials 2018, IC-DAEM 2018 in conjunction with 11th Seminar Nasional Metalurgi dan Material, SENAMM 2018

作者： Evelyna, Angela Astifanni, Tiara Khumaira Ruth, Imelda Asri, Lia Purwasasmita, Bambang Sunendar Faculty of Dentistry Maranatha Christian University Indonesia Materials Science and Engineering Bandung Institute of Technology Indonesia Advanced Materials Processing Group Engineering Physics Study Program Bandung Institute of Technology Indonesia Research Center for Nanosciences and Nanotechnology Bandung Institute of Technology Indonesia

Root canal treatment failures generally caused by microorganisms that have ability to invade dentinal tubules. Chlorhexidine is widely known to effectively eradicate broad spectrum bacteria that infected dentinal tubules. The delivery of chlorhexidine to the infected site of root canal still becomes an issue. In order to increase the stability and to regulate the release of chlorhexidine, encapsulation of chlorhexidine digluconate was conducted by employing nanocellulose and alginate nanocomposites. Nanocellulose was prepared from palm kernel cake using acid hydrolysis method. Transmission electron microscopy images showed the formation of whisker and fiber nanocellulose with the average diameter of 20 nm. Resulting nanocellulose was combined with alginate in the presence of Ca2+ crosslinker. Scanning electron microscopy images displayed sphere and oval morphologies of microcapsules with diameter of 500 nm. The microcapsules were further loaded with chlorhexidine digluconate 2% (w/v). In vitro drug release properties were evaluated in PBS at pH 7.4 (normal tooth environment) and at pH 5.5 (infected tooth environment). The UV-VIS results showed that chlorhexidine digluconate has higher release rate at pH 5.5 than at pH 7.4, suggesting that the microcapsule is a good candidate for the delivery of chlorhexidine digluconate to the infected root canal tooth environment. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Alginate

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Interior design study of lecturer rooms at E12 building 2nd floor UNNES – learn from COVID-19 pandemic

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IOP Conference Series: Earth and Environmental Science 2021年第1期700卷

作者： A Purnomo Study Program of Architecture Department of Civil Engineering Faculty of Engineering Universitas Negeri Semarang Building E4 Kampus Sekaran Gunungpati Semarang 50229 Indonesia

The covid-19 pandemic case has changed the structure of life in all aspects throughout the world. The field of man-made environment or architecture is no exception. The interior arrangement of a building, as part of the man-made environment, is also affected. The interior design of a building today seems to be obliged to participate in following the standards of new health-protocols in the new normal *** about the interior of the building that has already been utilized? Of course it requires further study to find out whether the interior of a building can be said to be healthy or not. This study aims to examine the interior design of the lecturer room E12 building 2nd floor UNNES in terms of health that is emphasized from the behavior of its users by referring to the situation of the covid-19 pandemic and its future prospects. The research method used is by field observations to search visual data, observing user behavior and textual data. Those who are categorized as users of the lecturer room E12 building 2nd floor UNNES are lecturers from the Department of Architecture, students, administrators and guests. The results of this study indicate that based on the pattern of user behavior and associated with the standard requirements of space, area, volume of space, material and infrastructure conditions, interior design of lecturer room E12 building 2nd floor UNNES, is included in healthy category, although there are several minor corrections that can be included as suggestions for improvement in order to adjust to the new normal era during the covid-19 pandemic period and thereafter.

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The impact of land-use change on Cengklik Reservoir's sedimentation rate

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Journal of Physics: Conference Series 2021年第1期1858卷

作者： Purwanti Sri Pudyastuti Annisa Fathi Yakan Jaji Abdurrosyid Hermono S Budinetro Civil Engineering Study Program Faculty of Engineering Universitas Muhammadiyah Surakarta Jl. A. Yani Tromol Pos I Pabelan Kartasura Surakarta Indonesia 57102

The Cengklik Reservoir is operated for irrigation of rice fields in 3 sub-districts in Boyolali Regency, namely Sambi, Ngemplak, and Nogosari. At the present time, the volume of the Cengklik Reservoir has decreased and resulted in dryness during the dry season. One of the main causes is due to the high sedimentation rate. This research was conducted to evaluate changes in land use that resulted in sedimentation in the Cengklik Reservoir. Erosion prediction in this study uses USLE (Universal Soil Loss Equation) analysis. The amount of sediment obtained uses the standard erosion data from USLE calculations, namely by multiplying the amount of erosion by the SDR and the area of River Basin. The potential for erosion and sedimentation used land use data for 10 years, from 2009 to 2019. Based on the research, the amount of erosion and sedimentation in the Cengklik Reservoir was fluctuated with the highest amount occurring in 2016, with erosion of 9,292 tones/ha/year and sedimentation of 4304,154 tons/year. In general, erosion and sedimentation have increased from 2009 to 2019. The classification of erosion in the Cengklik Reservoir according to this study was categorized as light erosion. The trap efficiency used in this study was calculated using formulae based on the research of Heinemann (1981) using the Brune method for small reservoirs with an area of less than 0.5 km2. In general, based on this study, the Trap Efficiency in Cengklik Reservoir was 95.254%.

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Topographic map analysis to determine Arjuno-Welirang volcanostratigraphy and implication for geothermal exploration 6

Topographic map analysis to determine Arjuno-Welirang volcan...

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6th ITB International Geothermal Workshop, IIGW 2017

作者： Apriani, Lestari Satriana, Joshua Chalik, Citra Aulian Mulyana, Reza Syahputra Hafidz, Muhammad Suryantini Magister Program of Geothermal Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia

Volcanostratigraphy study is used for supporting geothermal exploration on preliminary survey. This study is important to identify volcanic eruption center which shows potential area of geothermal heat source. The purpose of volcanostratigraphy study in research area is going to distinguish the characteristics of volcanic eruption product that construct the volcanic body. The analysis of Arjuno-Welirang volcanostratigraphy identification are based on topographic maps of Malang sheet with 1:100.000 scale, 1:50.000 scale, and a geological map. Regarding to the delineation of ridge and river, we determine five crowns, three hummocks, one brigade and one super brigade. The crowns consist of Ringgit, Welirang, Arjuno, Kawi, and Penanggungan, the hummocks comprise of Kembar III, Kembar II, and Kembar I, the brigade is Arjuno-Welirang, and the super brigade is Tengger. Based on topographic map interpretation and geothermal prospect evaluation method analysis, shows that Arjuno-Welirang prospect area have good geothermal resource potential. © Published under licence by IOP Publishing Ltd.

关键词： Volcanoes

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Patchouli oil analysis of chemical components using FT-IR and GCMS method

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AIP Conference Proceedings 2023年第1期2738卷

作者： Hermin Pancasakti Kusumaningrum Rizqi Sa’adatun Ni’mah Yunita Nurlindasari Annisa Imrani Sadam Arrois Eko Purnomo Fa’ireza Rafli Arfiansyah Erni Setyowati Bambang Dwi Loka Biotechnology Study Program Biology Department Faculty of Science and Mathematics Diponegoro University Jl. Prof. Soedharto SH. Tembalang Semarang 50275 Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Jl. Prof. Soedharto SH. Tembalang Semarang 50275 Indonesia Architecture Department Faculty of Engineering Diponegoro University Jl. Prof. Soedharto SH. Tembalang Semarang 50275 Indonesia Food Technology Department Faculty of Animal and Agricultural Sciences Diponegoro University Jl. Prof. Soedharto SH. Tembalang Semarang 50275 Indonesia

Patchouli (Pogostemon cablin Benth.) is a plant that produces essential oils to be used for cosmetics, soap, antiseptic, perfume, pharmaceutical, insecticide and aromatherapy industries. One of the products produced from the patchouli plant is patchouli oil. This study aims to determine the content of chemical compounds contained in the essential oil of patchouli using the GC-MS analysis method to determine the molecular structure of the compound and separate the fractions in patchouli oil. Another method is the FT-IR analysis method to identify the functional groups contained in patchouli oil. The chemical properties of patchouli oil from the Blado area, Batang Indonesia, are traditionally distilled from fresh patchouli leaves and stems. The results of the GCMS analysis showed that there were 10 compounds with 4 peaks of dominant components which were the constituents of patchouli essential oil, namely Patchouli Alcohol (39.46 %), Delta-Guaiene (21.51%), Alpha Guaiene (20.13%), Alpha-patchoulena (9.01%). In the FTIR results carried out in the range of 4000-450 cm-1, various functional groups such as C=C, –CH2, C-H, C=O, O-H, C-O, =C-H, and N-H. This shows that patchouli oil is rich in alcohol, aromatics, and aldehydes.

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Design and Implementation study of 3.12 kWp On – Grid Rooftop Solar PV System

Design and Implementation Study of 3.12 kWp On – Grid Rooft...

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International Conference on Electrical engineering and Informatics, ICEEI

作者： Ariyq Naufal Mizard Dwi Riana Aryani Ariono Verdianto Chairul Hudaya Faculty of Engineering Universitas Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok Republic of Indonesia

Conversion of fossil fuels as an energy source can be achieved by optimizing the use of renewable energy. One of the most used renewable energy is solar photovoltaics (PV). At present, solar power plant is an electrification support system for certain buildings because the abundant availability of solar radiation. On this research, Power and energy observations are carried out to determine measure the load power trend, the amount of energy flow from PV to the load, as well as import or export power from or to utility grid by direct measurement on Mosque of faculty of engineering, Universitas Indonesia. According to the study, the highest power generated by solar power plant mostly occurs at 12:00 - 13:00 with the highest power generated by PV is 2,344 W and the exported power is 939 W, and 32.19% - 55.67% electricity energy savings consumption from utility grid.

关键词： Power generation Inverters Power measurement Current measurement Power cables Renewable energy sources Energy measurement

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Evaluation of biochar and Bacillus sp. amendments on lead polluted land: Dehydrogenation enzyme and Pb availability studies

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Environmental Challenges 2024年 14卷

作者： Priyadarshini, Rossyda Nurherdiana, Silvana Dwi Solekhah, Bella Agit Hamzah, Amir Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No.1 Gn. Anyar Kec. Gn. Anyar Jawa Timur Surabaya 60294 Indonesia Center Innovation of Appropriate Technology for Lowland and Coastal Food Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No.1 Gn. Anyar Kec. Gn. Anyar Jawa Timur Surabaya 60294 Indonesia Study Program of Chemical Engineering Faculty of Engineering and Science Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No.1 Gn. Anyar Kec. Gn. Anyar Jawa Timur Surabaya 60294 Indonesia Universitas Tribhuwana Tunggadewi Jl. Telaga Warna Tlogomas Kec. Lowokwaru Jawa Timur Kota Malang 65144 Indonesia

The existence of lead (Pb) in soil has a significant ecological impact, resulting in a reduction in soil fertility. The present work effectively remediated soil contaminated with the heavy metal lead (Pb) through the application of biochar and Bacillus sp bacteria. Currently, there is ongoing research on the utilization of biochar amendments and Bacillus sp bacteria. The main objective is to assess the impact of these materials on the absorption of Pb and the activity of dehydrogenation enzymes. The findings indicate that both materials exhibit significant efficacy in absorbing Pb metal in contaminated soil over the incubation period from day 0 to day 42. The absorption capacity steadily increases until the concentration of Pb in the polluted soil reaches 1–2 ppm, using a biochar dosage of 10–30 ***⁻¹. Incorporating Bacillus sp bacteria at a concentration of 25 ***⁻¹ enhances the uptake of Pb metal. In terms of future prospects, the incorporation of biochar and Bacillus Sp has the potential to enhance the absorption of Pb metal, hence improving soil fertility in an environmentally friendly and cost-effective manner. © 2023

关键词： Bacillus sp Biochar Dehydrogenation enzyme Lead contaminant Soil

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Application of Monitoring Database for Accreditation Instrument UKI PAULUS

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IOP Conference Series: Materials Science and engineering 2020年第1期846卷

作者： Lande Sudianto Petrus Simon Study Program of Electrical Engineering Study Program Faculty of Engineering [Universitas Kristen Indonesia Paulus Study Program of Accounting Faculty of Economics and Business [Universitas Kristen Indonesia Paulus

Accreditation is a form of quality and feasibility evaluation of higher education institutions or study programs conducted by independent organizations or bodies outside of tertiary institutions. To achieve the target of accreditation scores, universities and study programs must adjust their internal conditions in accordance with the standards given by the National Accreditation Board for Higher Education (BAN-PT). In accordance with Permenristekdikti No 32/2016, BAN-PT develops accreditation instruments that are relevant to the development of the higher education sector in Indonesia and follows the global developments. study program Accreditation Instrument (IAPS 4.0) BAN-PT uses 9 criteria. The Accreditation Instrument of Monitoring Database of the study program UKI Paulus was built using a PHP interface and MySql database that can integrate the entire contents of the data and other supporting documents so that during the evaluation processes, the information of achievement determined by BAN-PT from each standard is obtained. The system development steps, uses the Waterfall method which starts from the analysis phase, system design, program code writing, system testing and system maintenance. From 30 respondents who joined the test using black box method, the user accessibility level reached 95.52%. It shows that the system run optimally. This system is able to provide easy access and management of study program accreditation documents.

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Increasing accuracy of classification physical activity based on smartphone using ensemble logistic regression with boosting method 3

Increasing accuracy of classification physical activity base...

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3rd International Conference on Science, ICOS 2019

作者： Lawi, A. Aziz, F. Wungo, S.L. Department of Computer Science Universitas Hasanuddin Makassar90245 Indonesia Faculty of Mathematics and Natural Sciences Universitas Pancasakti Makassar90132 Indonesia Program Study Informatics Engineering STMIK Kreatindo Monokwari98300 Indonesia

At present, the smartphone is equipped with several sensors such as Accelerometer, Gravity sensor, and Gyroscope which can be used to recognize human physical activities such as walking upstair and walking downstairs etc. Machine learning is needed to group data and get information. Statistical methods have poor performance in classifying because procedures must be met. To overcome this, an ensemble technique was used. This study proposes the application of the gradientboost ensemble method to classify walking upstair and walking downstairs. The *** system is designed for data retrieval using a smartphone. Then, the dataset will be partitioned into 70% training data and 30% test data. The results show that the performance of the ensemble boosting method produces 81.82% accuracy, 86.11% sensitivity and 77.50% specificity. © Published under licence by IOP Publishing Ltd.

关键词： Smartphones

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