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Simulink Matlab applications program in power system: study of effect of simulink matlab program acceptance in power system analysis

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IOP Conference Series: Materials Science and engineering 2021年第2期1098卷

作者： D Aiz P Gendroyono Electrical Engineering Education Study Program Faculty of Engineering Universitas Negeri Jakarta Jl. R.Mangun Muka Raya RT. 11/RW. 14 Rawamangun Jakarta Indonesia

The Simulink Matlab application program in electrical power system analysis needs acceptance from its users. This research is purposed to investigate the effect of Simulink Matlab application program acceptance to power system analysis. This research uses a quantified approach. The sample of this research is 119 students using the Simulink Matlab application program to do power system analysis. The data is analyzed with path analysis with the Partial Least Square approach. The result shows that the perception of ease has a direct effect to the perception of usage, behavior, and intention to use the Simulink application program with the path coefficient of 0.581, 0.574, and 0.249 respectively; the perception of usage and easiness in the usage of the Simulink application program has a direct effect to behavior in using the Simulink application program with the path coefficient of 0.218 and 0.574 respectively; the behavior in using the Simulink application program has a direct effect to the intention in using the Simulink application program with the path coefficient of 0.581, and the intention in using Simulink application program has a direct effect to the usage of the real Simulink Matlab application program with the path coefficient of 0.491. This research concludes that the usage of the Simulink application program for power system analysis is affected by the easiness and the usage of the application as well as the attitude of users.

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The study of Sedimentation at Jongkong Reservoir in District Central of Bangka through Erosion of Catchment Area

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IOP Conference Series: Earth and Environmental Science 2020年第1期537卷

作者： Miskar Maini Mashuri Civil Engineering Study Program Faculty of Infrastructure and Regional Engineering Institut Teknologi Sumatera Indonesia

Jongkong reservoir creates a reservoir of water that is used for the purposes of raw water as fundamental media for improvement of drinking water production especially at dry season for the District of Koba. The advantage of being able to hold water in wet season and releasing it in dry season will be detained if the life storage of the reservoir can be utilized effectively, but sedimentation problem will decrease its volume which can influence the life time of reservoir. Finally the reservoir becomes less effective, so it is very important to study. The method which is used to predict an average erosion rate in the catchment area considers factors of rain erosivity, soil erodibility, ground inclination of slope or slope length, management of crop and land, soil conservation. Calculation was done by using the USLE equation (Universal Soil Loss Equation) which was developed by Wischmeier and Smith (1965, 1978). From this research result, the prediction of surface erosion rate in the basin catchment area in the year 2019 is equal to 53.20 mm/year or equivalent with 62,491.92 m3/year, and the value of Sediment Delivery Ratio (SDR) is equal to 32,28 %. The number of material which eroded is equal to 957.59 Ton/Ha/year so it is classified into the medium erosion class category. The dead storage of 5% of the the volume of the reservoir cage will be fully charged in the year 2022 or for 3 The next year and the total volume of the reservoir Ridge will be full of sediment in the year 2062 or 43 years.

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The effect of sea water corrosion on tensile strength of combination welded joint of stainless steel 304-201

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

作者： Tjokorda Gde Tirta Nindhia I Wayan Surata I Wayan Bandem Adnyana I Gusti Komang Dwijana Study Program of Mechanical engineering Engineering faculty Udayana University JimbaranBali Indonesia 80361

Construction installations built with stainless steel are the main choice of the list of materials that can be used for construction near the sea. With the recent discovery of tungsten inert gas (TIG) technology, construction with stainless steel can be realized. In some cases stainless steel welding joints are made by connecting with stainless steel of different types without regard to the strength generated especially if experiencing corrosion in this case corrosion due to sea water. In this study the tensile strength of stainless steel combination joints of type 304-201 was tested and compared with similar joints of types 304-304 and 201-201. The effect of seawater corrosion on the tensile strength of stainless steel joints was also examined. This research found that the highest tensile strength is 304-304 joints followed by 304-201 combination connections and the lowest is 201-201 joints. The effect of seawater corrosion is known to reduce the tensile strength of all types of joints.

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Designing talent pool information systems at managerial level at PT. Pindad Enjiniring Indonesia

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

作者： P Renosori B Wijaya O Rukmana Industrial Engineering Study Program Faculty of Engineering Islamic University of Bandung (UNISBA) Bandung Indonesia

The background of this study is to determine human factors as key factors that are very important in increasing company competitiveness. The way the company manages this factor is by applying the concept of talent management. PT. Pindad Enjiniring Indonesia (PT PEI) is one of the companies that is implementing the concept, but obstacles are found at managerial level in the company, where the performance appraisal and potential are very slow. Meanwhile, the results of the assessment are needed to determine the right management for the employee's career. Therefore, companies need what is called a Talent Pool. The term Talent Pool in Talent Management is a tool used as a talent centre to classify, recommend, and develop employee talent used by several companies or experts. In this tool, the classification process uses the HAV 5X5 Matrix which will be developed into an information system design using the FAST method. The Talent Pool design is expected to be a tool to present performance and potential assessments, speed up the assessment process to present the results of the assessment, classify results to determine employee competencies, and be able to be the best recommendation tool in determining an employee's career path.

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Reaction pathways design based on the associative property of addition

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AIP Conference Proceedings 2023年第1期2975卷

作者： Fitri N. Febriana Siti N. Nafisah Lusia S. P. Boli Rizka N. Fadilla Wun F. Mark-Lee Ira Puspitasari Febdian Rusydi Research Center for Quantum Engineering Design Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya 60115 Indonesia Theoretical Physics Research Group Department of Physics Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya 60115 Indonesia Department of Chemistry Faculty of Science Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia Information System Study Program Faculty of Science and Technology Universitas Airlangga Jl. Mulyrejo Surabaya 60115 Indonesia

The associative property of addition facilitates the change of the group member. If the group members are molecules, can we apply this property to study a chemical reaction? The aim of this paper is to use the associative property of addition to design reaction pathways of methyl acetate hydrolysis in the acid environment. The reaction is found in Alzheimer’s Disease. We evaluate the designed pathways using activation energy obtained from density functional theory calculation. The results show the associative property of addition can be used to design four reaction pathways of the hydrolysis. The calculations show the acidity significantly affected the activation energy. This result agrees with the common knowledge. Hence, we have demonstrated the usefulness of the associative property of addition in designing chemical reaction pathways.

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Aluminium Recovery from Water Treatment Sludge as Coagulant by Acidification

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IOP Conference Series: Earth and Environmental Science 2020年第1期448卷

作者： D P Ruziqna N Suwartha S S Moersidik S Adityosulindro Environmental Engineering Study Program Department of Civil Engineering Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia

Aluminium in water treatment sludge can be recovered as coagulants by acidification method. However, there are some factors that affect efficiency in recovering aluminium, such as stirring speed during acidification, pH, and sludge characteristic. This study aims to find the optimum acidification stirring speed in recovering alum and to evaluate the performance of recovered coagulant compared to a pure coagulant. Aluminium recovery is carried out by adding sulphuric acid until the pH of the sludge reaches 2.5. The acidic sludge is stirred for 30 minutes, with acidification stirring speed is varied from 240–720 rpm, and left for settling until the supernatant is formed. The supernatant was used as a recovered coagulant, examined using a jar test to determine the optimum dose, and compared with the pure coagulant. The results show that the optimum acidification stirring speed was obtained at 540 rpm, where mass balance shows aluminium recovery efficiency of 16.5%. The optimum dose for recovered coagulant was 25 ppm, with a turbidity reduction of 93.38% in jar test. While the optimum dose for pure alum was 20 ppm, with turbidity reduction of 93.26%. Though potentially reduced higher turbidity, the recovered coagulant has slightly lower quality than the pure coagulant, which required a higher optimum dose.

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Application of Online Science Practicum by Using Microsoft Teams and Learning Management System (LMS) During the Covid 19 Pandemic

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Journal of Physics: Conference Series 2021年第1期2019卷

作者： W A Pertiwi L A Sanjaya Nadiyah Hasirah M Haramen A S Budi E Zarvianti R W D Puspa L K Sianipar W Qoiriyah H Sitompul Islamic Education Management Study Program Faculty Islamic of Education and Teacher Training Muhammad Azim Institute Jambi Indonesia Department of Physics Faculty of Mathematics and Natural Science Universitas Negeri Jakarta Indonesia. Sharia Economics Study Program Faculty of Sharia and Law Muhammad Azim Islamic Institute Jambi Indonesia Physics Education Study Program STKIP Muhammadiyah Sungai Penuh Indonesia Kartika VIII-1 Senior High School Jakarta Indonesia Department of Physics Education Universitas Pelita Harapan Tangerang 15811 Indonesia Informatics Engineering study program Faculty of Engineering Sheikh Yusuf Islamic University Tangerang Indonesia

The research objective of this is to see how to apply science practicum online using Microsoft Teams and Learning Management System (LMS). The form of this research is classroom action research which aims to apply the online science practicum during the Covid 19 pandemic. Therefore, it is carried out using two cycles in the application of online science practicum. The subjects of this study were students of the seventh semester in the Natural Science practicum course. Through observation and evaluation, it is shown that in the cycle I the percentage of practicum implementation which includes aspects of preparation, process and data and practicum results is 87.5%, in cycle II it has increased to 92.5%. In the assessment aspect of the practicum report, the average practicum assessment obtained in the first cycle was 3.09 from the highest score of 4 and in the second cycle was 3.7, while the aspect of student knowledge about the use of the Microsoft team which was taken using google form was 93%. In the aspect of student knowledge about the use of Learning Management System (LMS) by 75% and aspects of student understanding in the implementation of online science practicum using Microsoft Teams by 75%.

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An assessment of high carbon stock and high conservation value approaches in mining area

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IOP Conference Series: Earth and Environmental Science 2021年第2期807卷

作者： S H Larekeng M Nursaputra Nasri A S Hamzah A S Mustari A R Arif A P Ambodo Y Lawang A Ardiansyah Laboratory of Biotechnology Forestry Engineering Study Program Faculty of Forestry Universitas Hasanuddin Makassar 90245 Indonesia Laboratory of Forestry Planning and Information System Forestry Science Study Program Faculty of Forestry Universitas Hasanuddin Makassar 90245 Indonesia Laboratory of Conservation of Forest Resources and Ecotourism Forestry Science Study Program Faculty of Forestry Universitas Hasanuddin Makassar 90245 Indonesia Faculty of Engineering Universitas Hasanuddin Gowa 91711 Indonesia Faculty of Mathematics and Natural Sciences Universitas Hasanuddin Makassar 90245 Indonesia Vale Indonesia Sorowako East Luwu 92983 Indonesia

The impact of forest degradation due to open-pit mining activities causes sustainable ecological damage. mining activities that are not organized due to the mineral exploration process have resulted in many forest areas experiencing degradation. This degradation certainly reduces the level of carbon sequestration in the area, impacting the sustainability of environmental functions around the mining area. The high carbon stock (HCS) approach is a way to help companies implement their 'no deforestation' commitments. The high carbon stock approach will identify forests that must be protected and land that can be developed. Forests with high carbon stocks are maintained because they function as carbon stores, habitats for biodiversity, and provide the necessities of life for local communities. Therefore, this study aims to obtain data on the potential for carbon stocks and create a spatial model for distributing carbon content in the concession area of PT. Vale Indonesia can later be determined as high conservation value (HCV) areas using the high carbon stock approach. Measurement of carbon content in the study used an allometric equation that has been developed, then the distribution of carbon was made using the spatial vegetation index model obtained from Sentinel 2 imagery. The results showed an area of 30,526.49 (42.97%), which had high carbon stock with an average carbon stock of 106.09 ton/ha, which needed to be maintained as an area of high conservation value in the mining area of PT. Vale Indonesia.

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Analysis of chemical compound in essential oil from clove stem using the FTIR and GCMS methods

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AIP Conference Proceedings 2023年第1期2738卷

作者： Hermin Pancasakti Kusumaningrum Galih Wiji Agung Fakhri Santo Khoirudin Lailatul Khoiriyah Ardian Fikri Amrullah Farah Hanifah Handika Arya Listyanto Muhammad Zainuri I. Nyoman Widiasa Indra Gunawan 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 Chemistry Department Faculty of Science and Mathematics Diponegoro University Jl. Prof. Soedharto SH. Tembalang Semarang 50275 Indonesia Marine Laboratory Faculty of Fisheries and Marine Sciences Diponegoro University Jl. Prof. Soedharto SH. Tembalang Semarang 50275 Indonesia

Clove (Syzigium aromaticum) is an essential oil-producing plant which is widely found in Indonesia. Essential oil was made from it flower buds, leaves and stems for toothpaste, soaps, cosmetics, perfumes and cigarettes industries. Clove oil has been used in medicinal purposes for relieving pain, treating infection, easing digestive upset, dental and topical application. The objectives of the GC-MS analysis is to measure the type and content of compounds present in the clove stem sample, while the FT-IR analysis is to obtain the infrared spectrum on the clove stem sample through emission or absorption of solids, liquids. and gases in the sample. The chemical functional groups that were read through FT-IR on stem clove oil indicated that it contained aromatic compounds in the form of eugenol and eugenol acetate. The eugenol compound was the main component of the clove stem. The results of GC-MS analysis showed the chemical composition of clove oil consists of 28 compounds with the dominant components of clove oil are eugenol and caryophyllene (93% and 4.80%).

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The study of Coastline Changing and Total Suspended Solid Distribution Based on The Remote Sensing Data in Teluk Lamong Multipurpose Port Terminal

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IOP Conference Series: Earth and Environmental Science 2021年第1期698卷

作者： Widi Agoes Pratikto Ahmad Fitriadhy Muhammad Ilham Maulana Abiyani Choirul Huda Destyariani Liana Putri Liany Ayu Simatupang Nazariano Rahman Wahyudi Rendatiyarso Laksono Anggie Vibriyanti Rossari Dewi Ocean Engineering Departement Faculty of Marine Technology Institut Teknologi Sepuluh Nopember Surabaya 60111 Indonesia Department of Maritime Technology Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu Malaysia Ocean Engineering Study Program Institut Teknologi Kalimantan Kalimantan Timur 76127 Indonesia

Looking forward to the abovementioned conditions, this research is needed to elaborate on the effects of the reclamation to the marine resources in Teluk Lamong Multipurpose Port Terminal as the reclaimed product. In order to describe the impact of the port development, this study will analyze the shoreline changing, the current pattern modeling, as well as the Total Suspended Solid (TSS) modeling using the remote sensing data. The several numbers of expected objectives through this study are to get the set of scientific information on the shoreline changing in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020, to get the figure of current pattern in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020, and to elaborate TSS concentration through the modeling approach in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020. Hence, there is a set of methodologies and tools to cooperate with the information before and after the reclamation. The use of the Digital Shoreline Analysis System (DSAS) software to analyze coastline conditions. The using of Mike 21 to analyze the current pattern and TSS concentrations. In addition to the TSS analysis, it will also need a set of remote sensing data from the Google Earth Engine (GEE). The modeling and calculation give information about the End Point Rate (EPR) values and TSS values. The EPR values are 107.5 m/year, 59,625 m/year and 10,375 m / year. The TSS values are 0-20 mg/L, 20.1-40 mg/L, 40.1-80 mg/L, 80.1-120 mg/L and >120.1 mg/L. Moreover, the result shows the different values among the length of coastline, the current pattern, and TTS in the years 2012 and 2020. The difference in the coastline reaches 950 m at this latest 8 years. While it also brings the changing to the current pattern and sediment transport which show through its current velocity and sediment content per liter of seawater during high and low tide accordingly.

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