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All Journal Buletin Sumber Daya Geologi Mathematics and Applications (MAp) Journal Jurnal Polimesin
Umi Yuliatin
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Automotive Engineering Control & Systems Engineering Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering

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POTENSI KANDUNGAN UNSUR KIMIA EKONOMIS PADA LARUTAN PANAS BUMI DENGAN STUDI KASUS DI PLTP DIENG, KABUPATEN WONOSOBO DAN KABUPATEN BANJARNEGARA, PROVINSI JAWA TENGAH: THE POTENTIAL CONTENT OF ECONOMIC CHEMICALS ELEMENT IN GEOTHERMAL SOLUTIONS WITH A CASE STUDY IN THE DIENG GEOTHERMAL POWER PLANT, WONOSOBO REGENCY AND BANJARNEGARA REGENCY, CENTRAL JAVA PROVINCE Sabtanto Joko Suprapto; Suparno; Umi Yuliatin
Buletin Sumber Daya Geologi Vol. 15 No. 2 (2020): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v15i2.299

Abstract

The Geothermal fluid has a very high content of dissolved elements. Geochemical methods are used to determine the potential indication of dissolved economic elements. Geothermal exploration has been carried out throughout Indonesia, mainly by the Geological Agency. The exploration result in the existence of hot spring data by analyzing SiO2, Al, Fe, Ca, Mg, Na, K, Li, As, NH4, B, F, Cl, SO4, HCO3, and CO2. Base on the secondary data of 256 locations of hot spring in Indonesia that were statistically analyzed, an overview of the association of economic elements and impurities elements is obtained. Dieng Geothermal Power Plant with that has recuring problem of silica scale formation, becomes an interesting object as a case study of the potential of dissolved economic elements. The increase in dissolved content in geothermal fluids apart from naturally occurring, is triggered even more strongly by the geothermal power plant operating system, which changes the liquid phase to the vapor phase, hence the remaining liquid phase more concentrated. The potential content of economic chemical elements is determined by discharge measuring of the remaining liquid phase produced and the results of the analysis of the element concentration dissolved. The results of geochemical data clustering of hot springs obtained four elemental association, the association of SiO2-F, Al-Fe-SO4, Ca-Mg-Cl-Na-K, and Li-B-HCO3. Dissolved lithium content is high in several geothermal areas in Indonesia, found in hot springs with chloride type fluids. The brine produced from the reservoir at the Dieng Geothermal Power Plant is from a meteoric type fluid that has intensively reacted with the surrounding rock and a magmatic type fluid. The remaining brine that is from several separators and comes out through the silencer, at the Dieng Geothermal Power Plant has a total discharge of 457.1 m3/hour, contains high levels of several elements, lithium 77.31-99.4 mg/l, silica 1109.25-1220.9 mg/l, boron 404.16-589.4 mg/l, potassium 2532.2-4536.5 mg/l, and manganese 5.49-15.82 mg/l.
DETEKSI OUTLIERS DAN ANALISIS INTERVENSI DALAM MODEL ARMA Umi Yuliatin
MAp (Mathematics and Applications) Journal Vol 4, No 1 (2022)
Publisher : Universitas Islam Negeri Imam Bonjol Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15548/map.v4i1.4279

Abstract

Adanya kehadiran outliers dalam analisisi runtun waktu mengaburkan estimasi parameter model yang diberikan. Selain itu outlier juga memberi dampak besaran eror yang lebih tinggi. Dalam analisis time series Additive outliers (AO)  dan innovational outliers (IO) diperkenalkan sebagai usaha dalam memodelkan outliers. Usaha ini diberikan untuk menangani obserbasi yang tidak mengharmoniskan pola data sehingga membantu untuk dibentuknya model runtun waktu yang sehat terutama dalam proses ARMA. Estimator linier square error (LSE) digunakan untuk mengestimasi besarnya penyimpangan dari model dasarnya. Prosedur iterative dipaparkan sebagai salah satu prosedur untuk mendeteksi kedua model outliers ini.  Diperkenalkan juga analisis intervensi yang digunakan untuk mengakomodasi kejadian luar sebagai variabel eksogen dalam proses ARMA. Kemudian kombinasi analisis ourliers-intervensi ini bisa digunakan sebagai kesatuan analisis untuk menangani data yang jauh dari pusat. Sebagai simulasi data dalam kasus ini adalah data PDRB D.I Yogyakarta dalam bidang pertambangan dan penggalian. Dalam analisis ini  ditunjukkan deteksi outlier didalam model memberikan jumlahan kuadrat eror yang lebih kecil dibandingkan dengan model tanpa deteksi outlier sedemikian sehingga diperoleh model yang lebih baik.
Cascade flow rate-temperature control system design based on PID controller using direct synthesis tuning method Mochamad Rizky Pradana; Deni Aristoni; Roni Heru Triyanto; Umi Yuliatin; Suka Handaja Budi
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5960

Abstract

Cascade control is one of the multi-loop control schemes that aim to increase the performance of closed-loop control systems. Temperature control on the outlet of a plate heat exchanger often from suffers errors in the control variable and designated set point, so it is necessary to use cascade control in order to stabilize output temperature and reduce the disturbance. The Proportional Integral Derivative (PID) controller in conjunction with the direct synthesis tuning method is used due to ease of implementation and to modify the second-order process model and become the first-order process model, simplifying the model. In cascade control, the flow rate control is designated as the secondary loop, while the temperature control functions as the primary loop. The PID controller model is designed with direct synthesis tuning on the cascade flow rate temperature control, resulting a proportional gain of 2.15%, of 1.976 s, and τd of 0 seconds on the flow rate control loop. Whereas on the temperature control loop, the proportional gain is 13.23%, is 66.3 s and the τd is 7 seconds. The transient responses from cascade flow rate temperature control from Simulink are rise time (tr) = 106.7 seconds, settling time (ts) = 183 seconds, and maximum overshoot = 0%. Based on this parameter, the controller generates Process Variable (PV) responses from master control that can reach the Set Point (SP) without overshoot, maintain a steady state, and reduce the disturbance from slave control within 20 seconds of the response increasing from the steady state condition
Co-Authors Deni Aristoni Mochamad Rizky Pradana Roni Heru Triyanto Sabtanto Joko Suprapto Suka Handaja Budi Suparno