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All Journal Semah : Jurnal Pengelolaan Sumberdaya Peraira Makara Journal of Technology
M. Dani
Center for Nuclear Industry Material Technology - BATAN Puspiptek, Serpong, Tangerang 15314, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering

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Effect of Arc Plasma Sintering on the Structural and Microstructural Properties of Fe-Cr-Ni Austenitic Stainless Steels Parikin, Parikin; Dani, M.; Dimyati, A.; Purnamasari, N. D.; Sugeng, B.; Panitra, M.; Insani, A.; Priyanto, T. H.; Mustofa, S.; Syahbuddin, Syahbuddin; Huang, A.
Makara Journal of Technology Vol. 25, No. 2
Publisher : UI Scholars Hub

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Abstract

X-ray diffraction techniques were performed to determine the actual crystal structure of A2 austenitic stainless steel (ASS) as-cast and A2 ASS after arc plasma sintering (APS) for 2 s. Computations were conducted on the basis of the Bragg arithmetic formula by comparing the S2 arithmetic with the interplanar spacing. The Bragg arithmetic formula is a simple series for the determination of the crystalline phase of materials based on the Miller indices of cubic shapes or other shapes. A2 ASS as-cast was identified to have a crystal structure of face-centered cubic with lattice parameter a = 3.58 Å. A similar crystal structure can still be detected in A2 ASS after APS for 2 s with lattice parameter a = 3.60 Å. This finding was confirmed by neutron diffraction measurements and optical–electron microscopy observations. Under the same conditions, both A2 ASS as-cast and A2 ASS after APS for 2 s have similar cast structures. The grain boundary formed in A2 ASS as-cast is thinner than that in A2 ASS after APS for 2 s, which is visible in its boundaries. Moreover, the grain structure of A2 ASS after APS for 2 s, which was originally elongated particles, became globular particles. Similarly, granular precipitates became concentrated and encompassed the steel matrix along the grain boundaries. Furthermore, scanning electron microscopy with energy-dispersive X-ray analysis showed that particles and islands in steel are distributed in the grains and at the grain boundaries, respectively. Precipitates are composed of C, Cr, Fe, and Ni. The elemental contents of Cr and C are dominant; thus, Cr23C6 precipitate is formed at the grain boundaries.
UJI PENANGKAPAN PANCING TAJUR MODEL RAWAI VERTIKAL DI PERAIRAN RAWA DESA SUNGAI ULAK KABUPATEN MERANGIN PROVINSI JAMBI Dani, M.; Maryeni, Sri; Kholis, Muhammad Natsir
SEMAH Jurnal Pengelolaan Sumberdaya Perairan Vol 7, No 1: April 2023
Publisher : Universitas Muara Bungo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36355/semahjpsp.v7i1.991

Abstract

The number of types of fishing rods in land waters makes it possible to suspect the condition and potential of fisheries by calculating the capture rate (hook rate). Research using a vertical fishing rod that is operated in the ulak river swamp, Nalo Tantan District, Merangin Regency, Jambi Province. The aim of the study was to determine the fishing rod of the straight-line vertical longline model and to analyze the catch. The research method is experimental fishing. The results showed that the vertical standard model rods' capture rate (hook rate) did not meet the standard hook rate value, with an average of 0.04 (not good). The composition of the catch is dominated by nilem fish species (O. vittatus) as much as 71% and the lowest catch of limbat fish (C. nieuhofii) as much as 2%.
Co-Authors A. Dimyati, A. A. Insani Huang, A. Maryeni, Sri Muhammad Natsir Kholis Mustofa, S. Panitra, M. Parikin Parikin Priyanto, T. H. Purnamasari, N. D. Sugeng, B. Syahbuddin Syahbuddin