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All Journal Journal of Aquatropica Asia IKRA-ITH ABDIMAS Jurnal Himasapta Jurnal Riset Kelautan Tropis (Journal Of Tropical Marine Research) (J-Tropimar) MINERAL JAGE
Irvani, Irvani
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology

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EVALUASI KEMAMPUAN PRODUKSI RIPPING DOZER RIPPER D375 UNTUK MENCAPAI TARGET PRODUKSI BATUBARA 180.000 TON BULAN OKTOBER DI TAMBANG AIR LAYA EXTENTION TIMUR FRONT LIMOA PT BUKIT ASAM (PERSERO) TBK UPTE: Evaluate Performance Production Of Dozer Ripper D375 To Have Coal Production Target Was 180.000 Ton On Month October In East Extention Of Tambang Air Laya Front Limoa Pt Bukit Asam (Persero) Tbk Upte) Fredrick, Gregorius; Tono, E.P.S.B Taman; Irvani, Irvani
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v1i1.1611

Abstract

Coal production target in East extension of TAL Limoa Front was 180.000 ton/month in October2015 but the target achieved only 115.967,59 ton with the percentage achievement of productiontarget at 64,4 %. Therefore it was necessary to evaluate performance of Dozer Ripper D375 numberseries DZ 521. The evaluation conducted by taking primer actual data in mine site such as cycletime, work distance, work effeciency, Ripper penetration and then the collecting data was processedto make reparations of DZ 521 type of D375 Ripper with the aim to meet the production target. Theachieved production after prior evaluation conducted by increasing work time effeciency was162.826,57 ton with the production achievement percentage at 90.45 % and the lack production was17.173,43 ton, a further evaluation was conducted by repairing of Ripper penetration performance andthe production was 206.138,22 ton with the production achievement percentage at 114% and theexceed production was 26138,22 ton. Then work time efficiency and Ripper penetration was improvedto obtain target production of 289.475,83 ton with the production achievement percentage at 160%and exceed production of 109.475,83 ton with time reserve 150 hours/month and 4,8 hours/daymaybe can back up the problems on location production. The evaluation had been met coalproduction target of Limoa Front.
EVALUATION OF WATER QUALITY FOR THE NILE FISH-FLOATING NET CAGE AQUACULTURE SYSTEM AT BANGKA BELITUNG UNIVERSITY Kurniawan, Andri; Syaputra, Denny; Irvani, irvani
Journal of Aquatropica Asia Vol 8 No 2 (2023): Journal of Aquatropica Asia
Publisher : Program Studi Akuakultur, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/joaa.v8i2.4302

Abstract

The water quality feasibility is an important factor in aquaculture activities and increasing the productivity of cultivated fish. The Bangka Belitung University (UBB) is developing nile fish cultivation in earthen ponds using a floating net cage system. However, there has been no study related to the quality of water in earthen ponds that can be used to determine the feasibility of using these ponds for fish farming, especially nile fish. This study aimed to evaluate the water quality for the nile fish-floating net cage aquaculture system at Bangka Belitung University. The physical and chemical parameters observed were pH, temperature, DO, BOD, COD, NH3-N, PO4-P, NO3-N, NO2-N, NH3, C-organic, and minerals. Measurements of fish performance were observed in the form of SR, ADG, SGR, absolute growth (length and weight), and FCR. The results showed that in general the water quality of the earthen pond of UBB was still feasible for nile fish cultivation which produced SR (100%), ADG (0.20 g/day), SGR (2.18%/day), and FCR (1, 3). Water quality engineering can be done by adding a water wheel to increase the concentration of dissolved oxygen and also reduce the activity of Fe and other minerals that cause acidity and inhibit the growth rate of nile fish
Interpretasi Material Pada Rancang Bak Ukur Skala Laboratorium Dengan Pendekatan Konfigurasi Wenner, Wenner – Schlumberger dan Dipole-dipole: Material Interpretation in Laboratory Scale Measurement Design Using Wenner, Wenner–Schlumberger and Dipole-dipole Configuration Approaches Guskarnali, Guskarnali; Oktarianty, Haslen; Irvani, Irvani; Tono, E.P.S.B. Taman; Andini, Delita Ega
MINERAL Vol 8 No 2 (2023): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i2.4958

Abstract

Geoelectric measurements have been carried out using multichannel ResistivityMeter (Geores) tools with Wenner, Wenner-Schlumberger, and Dipole-dipole Configuration approaches on the influence of materials arranged in a laboratory-scale measuring tub design with dimensions of 194x184x80 cm. The measured method is the variation in resistivity value against each trajectory of the material. The method used is the variation of resistivity values for each path of the material that has been arranged in a laboratory scale measuring design. Geoelectric measurements were carried out on 7 lines (5 line in the West-East direction and 2 line in the North-South direction). The spacing between the electrodes of each line is 10 cm with 16 electrodes in one line so that each line has a length of 160 cm or 1.6 m which corresponds to the length and width dimensions of a laboratory scale measuring design. The electrode arrangement parameters are constant with respect to changes in the configuration selected from the geores parameters during geoelectric measurements. The measurement results showed that the identified depth reached 31.2 cm. The low resistivity value category has an interval of 374-4,397 ohm.meters at a depth of 0-12.5 cm, which is the influence of building sand material containing water and soil, while the depth interval is 12.5 - 31.2 cm ohm.meters (material category that is influenced by 2 iron rods, tin tailings sand, granite, gravel) with resistivity values ranging from 12,378–67,498 ohm.meters. From experiments on the influence of the resistivity values of the three Wenner, Wenner-Schlumberger, and Dipole-dipole configurations, it was obtained that the smallest absolute error resistivity value in the Wenner configuration was 5.01% against the overall average absolute error resistivity value of 10.16%.
Co-Authors Adiyatma, Adiyatma Akuan, Abrianto Aldino, Teo Andesta Granitio Irwan ANDRI KURNIAWAN Antasari, Deza Pahlevi Delita Ega Andini Elisa Elisa Epi Epi, Epi EPSB Taman Tono Fahraini, Ferra Faradibah, Nabila Fatimah, Desi Fredrick, Gregorius Guskarnali, Guskarnali Hudatwi, Mu’alimah Indriawati, Anisa Janiar Pitulima Kusuma, Dimas Dian Lenny, Lenny Mardiah Mardiah Mirsandi, Mirsandi Nurhadi, Rajandra Oktarianty, Haslen Pamungkas, Aditya Putra, Irza Tri Rahmadika, Bayu Ramadhan, Setiawan Ramona, Pisca Syaputra, Denny Tiambunan, Damos Tono, E.P.S.B Taman Yayuk Apriyanti, Yayuk Yusuf, Muh. Zuhirmanto, Zuhirmanto