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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Biota: Jurnal Ilmiah Ilmu-Ilmu Hayati Jurnal Penelitian Tanaman Industri Buletin Tanaman Tembakau, Serat & Minyak Industri Journal of Geoscience, Engineering, Environment, and Technology INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Pilar Nusa Mandiri Jurnal Geosains dan Teknologi JURNAL PENDIDIKAN TAMBUSAI Akta Agrosia Bulletin of Chemical Reaction Engineering & Catalysis Journal of Civil Engineering and Vocational Education
Heri Prabowo
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Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Physics Social Sciences Transportation

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Liquid Tobacco Smoke Concentration Test Against the Intensity of Stem Borer (Chilo saccharipagus) Attack on Sugar Cane Roeswitawati, Dyah; Nidya, Nindy; Indratmi, Dian; Prabowo, Heri
Akta Agrosia Vol 23 No 2 (2020)
Publisher : Badan Penerbitan Fakultas Pertanian (BPFP), Fakultas Pertanian, Universitas Bengkkulu

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Abstract

QQVIP303 merupakan platform perjudian online yang terkenal dengan beragam permainan menarik. Untuk mulai bermain, pengguna harus melakukan QQVIP303 login melalui link resmi yang disediakan. Dengan sistem keamanan terbaik, QQVIP303 menjamin privasi dan keamanan data para pemain. Bermain di QQVIP303 juga memberikan kesempatan untuk meraih keuntungan besar melalui berbagai jenis permainan. Tersedia berbagai qqvip303 link alternatif untuk QQVIP303 agar para pemain dapat mengakses platform tersebut dengan mudah dan lancar. Jadi, jangan ragu untuk bergabung dengan QQVIP303 dan rasakan pengalaman berjudi online yang seru dan menguntungkan
Y Zeolite-Based Catalyst for Palm Oil Cracking to Produce Gasoline Algifari, Arif; Makertihartha, I. G. B. N.; Subagjo, Subagjo; Prabowo, Heri
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 1 Year 2025 (April 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20267

Abstract

The increasing demand for oil fuel and the decline of crude oil reserves highlight the need for alternative energy sources. Palm oil, as a renewable resource, has potential for biofuel production through catalytic cracking. This study aims to develop and evaluate modified zeolite-based catalysts, particularly ZSM-5/HY, to produce palm oil-derived gasoline that meets European fuel standards. The research involved catalyst preparation, modification with ZSM-5 and phosphorus, and activity testing in a fixed-bed reactor. Gasoline yield and catalyst performance were analyzed using gas chromatography. The results showed nearly 100% conversion of palm oil under optimal conditions, with gasoline yield meeting European standard. The addition of ZSM-5 improved conversion and RON, while phosphorus modification reduced catalyst acidity, affecting yield and coke formation. This study concludes that modifying zeolite catalysts with ZSM-5 and phosphorus enables efficient palm oil-derived gasoline production with high RON and reduced aromatic content, contributing to sustainable energy solutions. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Kajian Teknis Produktifitas dan Keserasian Excavator dengan Dump Truck pada Kegiatan Coal Getting Seam 18 PT. Kurnia Alam Investama Kabupaten Batanghari Provinsi Jambi Prabowo, Heri; UZD, Marcelino
CIVED Vol. 10 No. 2 (2023): June 2023
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v10i2.397

Abstract

Penelitian ini bertujuan menghitung produktifitas dan keserasian excavator dengan dump truck pada kegiatan coal getting seam 18. Produktivitas dan kesesuaian peralatan penggalian dan pengangkutan perlu dihitung untuk menentukan nilai produktivitas mesin dalam memenuhi target produksi batubara yang ditetapkan. Metode penelitian dengan cara observasi di lapangan menggunakan data primer yang digunakan untuk perhitungan cycle time dari excavator dan alat angkut pada kegiatan coal getting. Menganalisis data dari nilai produktivitas mesin yang digunakan dalam kegiatan penambangan batubara serta kesesuaian excavator dan dump truck dalam mencapai target produksi. Produktifitas excavator kabelco SK 330 dalam durasi 60 menit kerja dapat melakukan mengeluarkan batubara sebanyak 182,92 MT/jam. Produktifitas 1 unit dump truck Mitsubishi Fuso 200 PS dapat melakukan penggangkutan 6,66 MT/jam. Berdasarkan perhitungan match factor (keserasian) antara 18 dump truck Mitsubishi Fuso 220 PS dan 1 excavator kabelco SK 330, maka diperoleh angka match factor < 1, berarti excavator harus menunggu dump truck Mitsubishi Fuso 220 PS. Pengoptimalan match faktor dan produktivitas dilakukan dengan metode trial & error dengan penambahan 3 unit dump truck dari 18 menjadi 21 dump truck, pengisian bucket 12 kali, perbaikan waktu edar (cycle time) alat gali muat menjadi 20 detik, dan waktu edar (cycle time) alat angkut menjadi 5200 detik. Maka nilai MF menjadi 1 artinya tidak ada waktu tunggu antara Excavator dengan Dump Truck.
Pengaruh Lingkungan Kerja terhadap Kinerja Karyawan dan Motivasi Kerja sebagai Variabel Intervening di CV Distributor Pembangunan Lazuar, Carissa Aria Millenia; Sutrisno, Sutrisno; Prabowo, Heri
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

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Abstract

Penelitian ini bertujuan untuk mengidentifikasi pengaruh kompetensi, kepemimpinan transformasional, lingkungan kerja terhadap kinerja karyawan dan motivasi sebagai variabel intervening. Penelitian ini dilakukan dengan beberapa metode yaitu statistik deskriptif dan statistik induktif/inferensial. Menggunakan penentuam sampel secara tidak acak, dan beberapa pengumpulan data berdasarkan data primer yaitu data yang diperoleh melalui penelitian dengan menggunakan wawancara tidak langsung dengan mengajukan kuesioner terhadap responden, dan data sekunder berupa studi kepustakaan. Analisis data yang digunakan indirect effect berguna untuk menguji hipotesis pengaruh tidak langsung suatu variabel yang mempengaruhi (eksogen) terhadap variabel yang dipengaruhi (endogen) yang dimediasi oleh suatu variabel intervening (variabel mediator), yang selanjutnya hasil pengolahan disajikan secara deskriptif analisis. Hasil penelitian ini menunjukkan :A. Kompetensi tidak berpengaruh terhadap kinerja karyawan, B. Kompetensi tidak berpengaruh terhadap motivasi kerja. C. Kompetensi tidak berpengaruh secara simultan terhadap motivasi kerja dan kinerja karyawan. D. Kepemimpinan transformasional tidak berpengaruh terhadap motivasi kerja. E.Kepemimpinan transformasional tidak berpengaruh simultan terhadap motivasi kerja dan kinerja karyawan. F. Kepemimpinan transformasional berpengaruh terhadap kinerja karyawan. G. Lingkungan kerja berpengaruh terhadap kinerja karyawan. H. Lingkungan kerja tidak berpengaruh terhadap motivasi kerja. I.Lingkungan kerja tidak berpengaruh secara simultan terhadap motivasi kerja. J. Adanya pengaruh tidak kompetensi, kepemimpinan transformasional, lingkungan kerja terhadap kinerja karyawan dan motivasi kerja.
Optimizing Digging Equipment Productivity Using Overall Equipment Effectiveness (OEE) Method in Coal Overburden Mining Activities Prabowo, Heri; Hutmi, Rahul; Dewata, Indang
invotek Vol 23 No 2 (2023): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v23i2.1097

Abstract

Coal companies have an overburden stripping production target of 95,000 bcm in January 2022, while the realization of production with the Sumitomo SH 350 LHD excavator and Hitachi Zaxis 350 H excavator is only 77,000 bcm or 82% of the production target. The purpose of this study was to obtain an analysis of the productivity of the Sumitomo SH 350 LHD Excavator (40) and Hitachi Zaxis 350 H Excavator (31) in the overburden stripping activity in January 2022, analyze the obstacle factors that caused the available working hours to be reduced by using the Fishbone diagram method, get an analysis of the Overall Equipment Effectiveness (OEE) value of the Sumitomo SH 350 LHD Excavator (40) and Hitachi Zaxis 350 H (31) Excavator before being optimized, and get the analysis and productivity of the Sumitomo SH 350 LHD Excavator (40) and the Hitachi Zaxis 350 H Excavator (31) which has been optimized with the implementation of Overall Equipment Effectiveness (OEE) to achieve the overburden stripping production target. After analysis and improvement efforts, the total overburden stripping production was 149,000 bcm, which means that it has reached the target and even exceeded the production target of 95,000 bcm/month with the OEE value of the digging equipment of 41% and 43%, respectively. However, the OEE value is still very low compared to the world-class standard OEE value, which is 85% and there is still room for improvement.
Distribution system dewatering in coal mining at PIT Sena Sungai Lilin District, Musi Banyuasin Regency, South Sumatra Province Prabowo, Heri; Wahyudi, Wahyudi; Rolitu, Rolitu
Jurnal Pendidikan Teknologi Kejuruan Vol 6 No 2 (2023): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v6i2.32623

Abstract

The purpose of this research is to calculate the total design discharge of water entering the mining site in the sena pit of PT Putra Muba Coal (PMC), design the appropriate shape and dimensions of the sump to accommodate the amount of water entering the mining site and calculate the number of pumps needed to remove water entering the mine to the settling pond. The source of water entering the mine area comes from rainwater entering the mine opening, water runoff from the rainwater catchment area in the area around the mine opening, and groundwater rise. Based on the results of the analysis of rainfall data for 2013-2022, a rainfall plan of 77, 225 mm/day, rainfall intensity of 9.714 mm/hour with a rainfall return period of 2 years was obtained. The rainfall catchment area at the research site is 72,936 m2 with a discharge generated of 0.03 m3 / second and groundwater discharge of 0.00812 m3 / second. To remove the water entering the mine, it is flowed naturally into the sump with dimensions of 50 m length, 14 m top width, 13 m bottom width, and 5 m depth. The dimensions of the open channel are planned with a channel width of 32 cm, a flow depth of 28 cm, a wet cross-sectional area of 13.6 cm2, a wet circumference of 97 cm, a hydraulic radius of 9.25 cm, and a channel length of 233m. The water in the sump is pumped into an open channel. The pump used has a maximum discharge of 150 m3 / hour and a total pump head of 11.8712 m with a pipe diameter of 6 inches.
Mine Dewatering Design for Re‑Mining in a Mined‑Out Laterite Nick-el Pit: Case Study of South Pit, PT NPM, Central Sulawesi Ananda, Sri Sovia Duha; Baharuddin, Ichsan Invanni; Har, Rusli; Prabowo, Heri
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

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Abstract

This study aims to design an effective mine dewatering system for the South Pit mined-out area of PT Nusajaya Persadatama Mandiri, supporting re-mining activities. The methods used include hydrological analysis to determine the design rainfall using the Log Pearson Type III distribution, calculation of rainfall intensity using the Mononobe method, and estimation of runoff discharge using the rational method based on the catchment area. The results show that the design rainfall is 72.2 mm/day with a rainfall intensity of 49.9 mm/hr and a catchment area of 13.47 ha. The total inflow into the pit is 0.48 m³/s (1,726 .20 m³/hr), requiring a sump capacity of 7,250.03 m³. The pumping system is designed using a DnD LCC-M 100 pump with a capacity of 300 m³/hr, operated for 14 hours/day. The pumped water is conveyed through a 6-inch diameter HDPE pipe to a trapezoidal open channel, where it is then discharged into a Water Management Pond (WMP) with a total capacity of 11,200 m³, consisting of four compartments. The research results indicate that the designed mine drainage system is capable of effectively controlling mine water, thereby supporting safe and efficient re-mining operations.
Co-Authors Algifari, Arif Ananda, Rizky Ananda, Sri Sovia Duha Dyah Roeswitawati Elna Karmawati Gultom, Henry Casandra HAR, Rusli Harizona Aulia Rahman Heri Prabowo Herlawati Herlawati Hutmi, Rahul I.G.A.A. Indrayani Ichsan Invanni Baharuddin IGAA. INDRAYANI, IGAA. Indang Dewata Makertihartha, I. G. B. N. MP Editor, Ir. Dian Indratmi, MP Nidya, Nindy Rolitu, Rolitu Sakti, Ronal Dino Kuncoro Sri Mulyaningsih Subagjo Subagjo Titiek YULIANTI TUKIMIN TUKIMIN, TUKIMIN UZD, Marcelino Wahyudi Wahyudi Wida Prima Mustika