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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management Jurnal Teknik Mesin Mechanical Xplore Teknologika
Rohman
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Automotive Engineering Computer Science & IT Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering

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Casualty Per Cent dalam Perhitungan Etat Hutan Tanaman Jati Perum Perhutani (Casualty Per Cent on AAC Determination of Teak Forest Plantation in Perum Perhutani) Rohman
Jurnal Manajemen Hutan Tropika Vol. 14 No. 2 (2008)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (203.879 KB)

Abstract

The research was aimed to detect the change of forest area over planning periods to estimate casualty over production period of forest management. It is undeniable fact that teak plantation area has inevitable risk due to bad practices of illegal logging, deforestation, and forest degradation. However, Perum Perhutani does not consider these risk factors in the company yield regulation and annual allowable cut (AAC) determination. The results show that the percentage of forest area that changed into the higher age class by order from the lowest age class were 16.3% (age class I to II), 33.74% (age class II to III), 3.36% (age class III to IV), 31.54% (age class IV to V), 19.69% (age class V to VI), and 15.73 % (age class VI to VII). The casualty per cent calculated from age class I, II, III, IV, V, VI were 75%, 70%, 55%, 54%, 32%, and 16%, respectively. The AAC regarding to the casualty per cent for planning period 2005-2014 in Bagian Hutan Kradenan Utara was 595 m3/year, while the current AAC calculation was 1.840 m3/th, regardless the casualty percent.
ANALISIS SIFAT MEKANIS BAJA St.60 HASIL PENGELASAN FRICTION WELDING DENGAN VARIASI PENDINGIN Agus Suprayitno; Rohman; Dimas Sanjaya
Jurnal Teknik Mesin Mechanical Xplore Vol 2 No 2 (2022): Jurnal Teknik Mesin Mechanical Xplore
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (679.04 KB) | DOI: 10.36805/jtmmx.v2i2.2168

Abstract

Banyaknya komponen dalam industri manufaktur memerlukan penggunaan teknik pengelasan yang efektif dan efisien. Pengelasan gesekan adalah metode penyambungan benda padat di mana laju rotasi satu benda kerja digabungkan dengan laju rotasi ujung benda kerja yang lain. Durasi gesekan, kecepatan rotasi, dan tekanan merupakan variabel penting dalam pengelasan gesekan karena mempengaruhi kualitas dan hasil proses. Material yang digunakan dalam penelitian ini adalah baja St.60. Parameter yang digunakan dalam penelitian ini adalah kecepatan putar 2300 rpm, waktu gesekan 60 detik dan tekanan 70 Psi. Dengan memvariasikan pendingin. Setelah pengelasan gesekan, benda kerja dipadamkan dengan minyak pendingin, air garam, udara dan air. Untuk mengetahui sifat mekanik dari hasil pengelasan ini dilakukan pengujian kekerasan dan pengujian tarik. Dari hasil penelitian ini diketahui bahwa variasi cairan pendingin mempengaruhi metode las gesekan. Hasil kekerasan tertinggi daerah sambungan sebesar 170 HB terdapat pada variasi fluida pendingin air asin, kekerasan terendah pada daerah sambungan sebesar 112,33 HB terdapat pada variasi fluida pendingin udara. Hasil kekuatan tarik tertinggi sebesar 517,82 N/mm² terdapat pada variasi pendingin air asin. sedangkan kekuatan tarik terendah sebesar 291,70 N/mm² terdapat pada variasi fluida pendingin air. Many components in the manufacturing industry necessitate the use of effective and efficient welding techniques. Friction welding is a method of joining solid objects in which the rotation rate of one workpiece is combined with the rotation rate of the other end of the workpiece. Friction duration, rotational speed, and pressure are all critical variables in friction welding because they affect the quality and outcome of the process. The material used in this research is St.60 steel. The parameters used in this study are the rotational speed of 2300 rpm, the friction time of 60 seconds and the pressure of 70 Psi. By varying the coolant. After friction welding , the workpiece is quenched with coolant oil, salt water, air and water. To determine the mechanical properties of this welding result, this research is carried out by testing the hardness and tensile testing. From the results of this study, it is known that the variation of the coolant affects the friction welding method. The result of the highest hardness of the connection area of 170 HB is found in the variation of the salt water cooling fluid, the lowest hardness of the connection area of 112.33 HB is found in the variation of the air cooling fluid. The result of the highest tensile strength of 517.82 N/mm² was found in the variation of the salt water coolant. while the lowest tensile strength of 291.70 N/mm² was found in the variation of the water cooling fluid.
ANALISIS PERPINDAHAN PANAS TUNGKU PADA TUNNEL KILN UNTUK PROSES PEMBAKARAN BATA MERAH DI PT XYZ Irwan Suriaman; Uus Supriatna; M. Rizky Anugrah; Rohman; Dede Ardi Rajab; Yadi Heryadi; T.B.U. Adi Subekhi; Wawan
Jurnal Teknologika Vol 13 No 1 (2023): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51132/teknologika.v13i1.259

Abstract

Ceramics are widely used by people in industries for various purposes, for example to make cups and tiles. Currently ceramics are widely used in various industrial raw materials. Ceramics are used as materials for making spark plugs, electrical insulators, and raw materials for printing tools. The ceramics industry is energy intensive in utilizing electrical energy. The amount of energy absorption affects the amount of costs that must be incurred by companies for energy consumption. To reduce costs used by ceramic companies during production, the use of energy is a way to increase the efficiency of the tunnel kiln. Therefore, based on these problems, research was carried out to analyze the data resulting from measurements of the large flow rate of heat transfer by conduction in the thickness of the wall, the amount of heat loss lost by convection on the outside of the wall, and the amount of loss in production costs incurred due to heat loss. This aims to obtain a solution that saves electrical energy used in the production of ceramics. So it was obtained that the highest conduction was in the top firing zone of the core from burning red bricks with heat dissipation reaching 829.73 Watts. Meanwhile, the heat lost at a distance of 50 cm and at a distance of 100 cm is the top firing zone which has the greatest heat loss of up to 0.1 MW compared to the other zones. The preheating zone reaches 5 kW and the cooling zone reaches 16 kW.
Co-Authors Agus Suprayitno Dede Ardi Rajab Dimas Sanjaya Irwan Suriaman M. Rizky Anugrah T.B.U. Adi Subekhi Uus Supriatna Wawan Yadi Heryadi