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Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
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Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 905 Documents
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Estimasi Temperatur Reservoir Panasbumi Menggunaakan Metode Geothermometer Pada Mata Air Panas Bitingan Dan Sipandu Area Panasbumi Dieng, Kabupaten Wonosobo, Provinsi Jawa Tengah Waskita Murti Bambang Yudhana Yudhana; Dianto Isnawan
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Indonesia has a geothermal energy potential of 28,617 MegaWatt, which is 40% of the world's total geothermal potential. One example of a volcano on the island of Java that has geothermal potential is the Telomoyo Volcano. This study aims to determine the geothermal system and to estimate the reservoir temperature using the Geothermometer Method. The results of the analysis show that the type of fluid is Bicarbonate Water. The results of plotting the concentrations of Sodium (Na), Potassium (K) and Magnesium (Mg) show that they are in the immmature water zone. The estimated temperature of the subsurface reservoir of Sipandu hot spring is ±247.38°C, Bitingan hot spring is ±195.21°C. The geothermal system in the study area is a liquid dominated system. Utilization of potential geothermal manifestations as hot springs and high temperature reservoirs that are good for developing into geothermal power plants.
Identifikasi Fluktuasi Muka Air Laut dengan menggunakan Pendekatan Penginderaan Jauh Daerah Tegal, Jawa Tengah pascuela manikin; Adi Prabowo
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

ABSTRAK Daerah Tegal merupakan salah satu daerah pesisir yang berbatasan langsung dengan pantai Utara Jawa sehingga dapat mengalami perubahan garis pantai yang di sebabkan oleh fluktuasi muka air laut. Studi terkait fluktuasi muka air laut berkaitan erat dengan pasang surut dan perubahan garis pantai. Untuk melihat suatu perubahan garis pantai di perlukan metode yang tepat salah satunya dengan menggunakan Metode Penginderaan Jauh, selain itu juga di perlukan metode perhitungan berupa Metode Admiratly untuk menentukan nilai rata – rata serta tipe dari pasang surut. Dari hasil perhitungan di peroleh Nilai MSL tahunan di Stasiun Pengamatan Pasang Surut Kota Cirebon, Jawa Barat pada tahun 2014-2017 berturut-turut yaitu sebesar 67.85 cm, 73.75 cm, 81.42 cm, 85.50 cm dan untuk nilai Laju kenaikan muka air laut rata - rata adalah 5,97 cm per tahun dengan tipe pasang campuran condong ke ganda (mixed tide prevailing semidiurnal), berdasarkan pengamatan penginderaah jauh terlihat perubahan garis pantai sepanjang tahun 2014 -2017 akibat dari fluktuasi muka air laut yang ada. Kata Kunci : fluktuasi, pasang surut, perubahan garis pantai.
ANALISIS KETERDAPATAN MINERAL EKONOMIS DENGAN METODE LINEANMENT DENSITY DISEKITAR KECAMATAN PANGKALAN JAMBU, KABUPATEN MERANGIN, PROVINSI JAMBI. MAULANA DIMAS KIRANA; HURIEN HELMI; OBRIN TRIANDA
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

One area that is famous for the existence of gold mines owned by the people in Jambi Province is in Merangin Regency, more precisely around Pangkalan Jambu District. The presence of gold mines around the research area indicates the result of hydrothermal alteration in the form of gold deposits. The use of geographic information systems aims to determine the location of the lineament density zone which is estimated to be the source of hydrothermal alteration. The purpose of this study is to model lineament density by utilizing secondary data in the form of DEM data which is added with hillshade to extract lineaments, then combined with structure on lineaments based on Regional Geological Maps. The results showed that high and medium density zones were located in areas associated with fault zones, which is one of the strong factors for the presence of alteration in areas that have a strong structural density or crushed zone. It is known that the majority of mines are in the medium-low density zone close to the river flow, this can happen because the river passes through several density zones at once can be used as a transportation medium for materials that have experienced erosion so that they can be deposited in areas that are currently under water. mine. It is known that there is potential for alteration in 2 zones of medium and high density, each having an estimated area of ​​4130.50 Ha in the high density zone and 49557.53 Ha in the medium density zone.
Perbandingan Metode Geostatistik dari Hasil Estimasi Sumberdaya Nikel Laterit jenius
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Nickel laterite is formed as a result of a long weathering process, through chemical weathering and supergene enrichment, mainly from ultramafic rocks under conditions of moderately hot temperatures and moderately high rainfall and controlled by fluctuating movements of the groundwater table. Laterite nickel ore constitutes 73% of the world's nickel resources and will be the dominant nickel source in the future. This study aims to analyze the comparison of geostatistical methods in the research area. This study was divided into several stages, namely: field data collection (drill data), data from this stage was used to determine the depth and distribution of the laterite zone. Laterite nickel content estimation was carried out in the limonite and saprolite zones. So that it can be known an accurate method in the research area. In this case, the methods compared are the Ordinary Kriging (OK) and Inverse Distance Weighting (IDW) methods to find out which method is the most accurate to be used in this study.
Substitusi Pasir Besi Dengan Bestmitell Terhadap Nilai Kuat Tekan Dan Porositas Beton Rifki Pratama; Lilis Zulaicha; Retnowati Setioningsih
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

ABSTRACT This research was conducted to determine the compressive strength and porosity of concrete with variations of 0%, 5%, 15%, 25% iron sand as a substitute for fine aggregate and variations of 0%, 0.3% bestmitell as an additive to concrete mixtures. This research is also intended to compare concrete with or without Bestmitell added materials. The test was carried out at the age of 41 days, with a cylindrical specimen with a height of 30 cm and a diameter of 15 cm, with a total of 48 specimens. The results of testing the average compressive strength of normal concrete (BN) were 26.233 MPa. The results of testing the average compressive strength of iron sand concrete without bestmitell are at (BP15) with a compressive strength of 26.270 MPa. The test results for iron sand concrete and bestmitell were highest at (BP2503) with a compressive strength of 31.780 MPa. The results of the porosity test in each test object increased from normal concrete (BN) with a porosity of 1.39%. In this study, the effect of porosity is very small; to the compressive strength of concrete with a coefficient of R2 = 0.0015 and R2 = 0.1956. Keywords: Concrete, Iron Sands, Bestmitell, Compresstion strength, Porosity.
the Electrical Resistivity Tomography Untuk Identifikasi Akuifer di Daerah Vulkanik (Studi Kasus: Kaliangkrik-Magelang) Winarti Winarti; Misdiyanta Partama
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

The availability of ground water is one of the pillars of life, and must be preserved. The first step in conserving groundwater is identifying its presence. The area on the volcano's upper slopes functions as a water catchment, resulting in abundant and high-quality groundwater. The Kaliangrik area, which is located on the slopes of Mount Sumbing, is comprised of volcanic rock. The study's goal was to identify aquifers on volcanic slopes using the Electrical Resistivity Tomography (ERT) method. ERT measurements were taken over a distance of 500 meters, with electrode spacing of 30 meters, and a total n of 6. The Res2DInv software generates a 2D resistivity cross-section that describes the resistivity value laterally and vertically. Aquifers identified through ERT can serve as a basis for groundwater conservation efforts in water catchment areas. The resistivity cross section results show that the topography of the southeast is lower than that of the northwest. The resistivity range is classified into three categories: low (600 ohm meters), high (600-12,000 ohm meters), and very high (> 12,000 ohm meters). Andesite breccia has a low resistivity value as an aquifer, whereas lava has a high resistivity value. The aquifer is 20-25 meters deep (shallow) and includes a porous aquifer system. The southwest (higher topography) is the source of groundwater, so it must be conserved.
PENATAGUNAAN LAHAN REKLAMASI DAN REVEGETASI PADA KEGIATAN PENAMBANGAN BIJIH NIKEL PT IFISHDECO TBK KABUPATEN KONAWE SELATAN PROVINSI SULAWESI TENGGARA La Ode Miqdad Husein
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
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Abstract

In good use of ex-mining land, it is necessary to apply good and correct reclamation so that it can realize environmentally sound development. The purpose of this study was to examine the stages of the land use management process for reclamation and revegetation carried out by PT Ifishdeco with research methods directly involved in daily research activities. PT Ifishdeco manages the reclamation land use with a land area of 202.67 Ha which is divided into 97.29 Ha North Block and 105.38 Ha South Block. PT Ifishdeco carries out reclamation activities through the stages of planning, land preparation, land management, nurseries, planting and maintenance and monitoring. The types of plants used were legumes (Arachis hypogaea L.) as cover crops, cassava (Manihot esculenta) as pioneer plants and cashew nuts (Anacardium occidentale) and gamal (Gliricidia sepium) as core plants.
Menghitung Hasil Estimasi Sumberdaya Nikel Laterit Menggunakan Metode Ordinary Kriging (OK) jenius
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Nickel laterites make up 60 to 70% of the world's Ni resources, but even though they have been mined for approx 140 years, until 2000 they accounted for less than 40% of global Ni production, the remainder is from sulfide ores. Laterite nickel deposits are formed by prolonged and pervasive weathering of ultramafic rocks containing Ni silicates, generally in tropical to subtropical climates. The deposits can be further classified as hydro silicate deposits, clay silicate deposits, and oxide deposits based on the mineralogy of the ore. The physical and chemical properties of laterite nickel deposits are a function of many factors, including the composition of the host rock. This research is divided into several stages, namely: field data collection (drill data), data from this stage is used to determine the depth and distribution of the laterite zone. Perform laboratory analysis to obtain Ni levels. As well as Performing Modeling to determine the distribution model of the elements in nickel deposits based on laboratory analysis data, the method used in this study is themethod Ordinary Kriging (OK).
Mineralogi Batuan Alterasi Hidrotermal Daerah Kaligono, Kecamatan Kaligesing, Kabupaten Purworejo, Jawa Tengah Reynaldo setiyawan; okki verdiansyah
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
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Abstract

ABSTRAK A belt of significant copper-gold mineralization runs through central Java's southern mountains. Kokap, Bagelen, Salaman, and eventually the discovery of porphyry in Sumbersari are all prospective Au-Cu mineralization in Kulonprogo. The research focuses on outcrop observation and laboratory investigation, such as XRD, petrography, and ore microscopy, with the goal of determining the Sumbersari area's mineralogical paragenesis. The research location is located in the Khuluk Gajah part of the old Kulon Progo volcanic complex. The goal of this research is to figure out the mineralogy of the hydrothermally altered rocks in the vicinity. Based on lithology, alteration, and mineralization data gathered from the surface mapping. One of the lithologies obtained is microdiorite, with illite-sericite secondary biotite as the result of megascopic examination of the alteration and Quartz-andesine-albit-serisite-phengitilitklinochlor as the result of XRD analysis. Obtaining crossing veinlets (stockwork) in the forms of "A," "AB"/"B," and "D" veins is also possible. The hydrothermal fluid temperature is in the range of 280 – 320 oC, with a neutral-alkaline pH, based on these mineral correlations (6-7). The Sumbersari sample's hydrothermal alteration reveals a porphyry and epithermal overprint mechanism. Kata kunci : busur magmatik, Porfiri, alterasi hidrotermal, dan XRD
PENGARUH HAMBATAN ALIRAN UDARA PADA KONDENSER TERHADAP PERFORMANSI AC SPLIT 1 PK Triaji Pangripto Pramudantoro Pramudantoro
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
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Abstract

ABSTRACT Poor maintenance will decrease the performance of the split Air Conditioning unit, some cases that are often encountered include: the fins on the outdoor unit are dirty, fragile or even fold. Disruption of air flow in the outdoor unit will then have an impact on the performance of the split A/C unit, especially on cooling rate, working pressure, coefficient of performance and consumption of electrical energy. The purpose of this study was to determine the correlation/impact of airflow resistance in the outdoor unit on A/C unit performance and the magnitude of changes/increases in electrical energy consumption. The method used is by comparing the normal performance without being disturbed by the air flow in the outdoor unit compared to the engine with the outdoor unit airflow experiencing obstacles. Starting with a given resistance successively equal to 1/6, 1/8 and 1/4 of the surface area of ​​the condenser. The results obtained in the form of an increase in discharge temperature, suction temperature, condenser temperature, evaporator temperature and electric current. On the other hand, there was a decrease in the refrigeration effect by 6.25%, a decrease in the COP value from 4.63 to 3.7 and an increase in electrical power consumption by 9.3%. Keywords: condenser air flow, split AC.

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