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Ansori
Universitas Jember
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The Effect of Manhole Form on Double Bottom Ship Construction Rudianto; Ede Mehta Wardhana; Jangka Rulianto; R Puranggo Ganjar Widityo; Ansori
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6466

Abstract

The ship's hull construction must withstand all loads, be made as light as possible and comply with regulations. The purpose of this study was to determine the maximum strength limit of double bottom ship construction with manhole form variations. Research design for this study; literature studies, field studies, and simulations using ANSYS. The results of the existing double model structure strength values for the maximum stress values in the sagging hogging state are 236.60 MPa and 154.18 MPa. Von Mises stress values are 227.94 MPa and 136.26 MPa. The shear stress values are 131.5 MPa and 77.36 MPa. The maximum deformation is 0.0049 m, and the safety factor is 1.346. The total construction weight is 201.83 metric tons. The best results of the analysis of variation were found in Model B1, which changed the hole ratio from 0.75 to 0.6 and increased the hole dimension by 200 mm. The maximum stress values of Model B1 in the sagging-hogging condition are 186.93 MPa and 141.54 MPa. Von Mises stress values are 238.72 MPa and 184.82 MPa. The shear stress values are 113.37 MPa and 137.42 MPa. The safety factor is 1.337 m, and the maximum deformation is 0.0034 m.
IMPLEMENTASI TEKNOLOGI TEPAT GUNA BIOMACERATOR DALAM PENGOLAHAN BIOPESTISIDA LIMBAH TEMBAKAU DI DESA JATIAN, JEMBER Naylatul Qiromi; Putri Safitri; Khoirun Nisya' Ulfiani; Firyaal Ulayya Al-Daan; Jodi Armansyah; Helda Wika Amini; Yukti Nurani; Ansori; Sonya Hakim Raharjo; Merymistika Yufrani Afred; Ratri Sekaringgalih; Nurul Hidayati
Jurnal Edukasi Pengabdian Masyarakat Vol 5 No 2 (2026): APRIL 2026
Publisher : FIP UNIRA MALANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36636/eduabdimas.v5i2.9166

Abstract

Jatian Village, Pakusari District, Jember Regency, has ±204,80 hectares of tobacco farmland, around 6.000 plants, and average production of 9,93 quintals of dried tobacco each season. About 18% of biomass becomes waste as inferior leaves and stems that remain unused and may pollute the environment. Yet tobacco waste contains active compounds such as nicotine, alkaloids, and flavonoids that can be used as raw materials for biopesticides. This program examined converting tobacco waste into biopesticide through maceration assisted by a biomacerator. The waste was chopped and dried, then macerated for 48 hours at a 3:7 material-to-solvent ratio using water-ethanol mixtures in two variations (9:1 and 9:2) to compare extraction effectiveness. Effectiveness tests showed that the 20% ethanol formulation accelerated mortality of armyworms within 3 minutes and grasshoppers within 45 minutes, whereas the 10% ethanol formulation required 10 minutes and 1 hour 20 minutes, respectively. The activity increased community understanding from 15% to 85%, enabled 85% of participants to operate the biomacerator independently, and achieved 95% satisfaction, indicating a sustainable solution that strengthens self-reliance in agricultural waste management.
Co-Authors Ede Mehta Wardhana Firyaal Ulayya Al-Daan Helda Wika Amini Jangka Ruliyanto Jodi Armansyah Khoirun Nisya' Ulfiani Merymistika Yufrani Afred Naylatul Qiromi Nurul Hidayati Putri Safitri R Puranggo Ganjar Widityo Ratri Sekaringgalih Rudianto Sonya Hakim Raharjo Yukti Nurani