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All Journal Journal of Degraded and Mining Lands Management Jurnal Bakti Masyarakat Manajemen Bhinneka Multidisiplin Journal
Tumpal Ojahan Rajagukguk
mahasiswa pasca sarjana program studi mesin fakultas teknik unsri
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PELATIHAN DASAR TEKNIK PENGELASAN SHIELDED METAL ARC WELDING (SMAW) BAGI WARGA UNIVERSITAS MALAHAYATI UNTUK PENINGKATAN KEMAMPUAN SDM TERAMPIL Marjuni, Teuku; Rajagukguk, Tumpal Ojahan; Ibrahim, Fauzi; Ansyori, Anang; Prastyo, Adi; Hadi, Agung Efriyo
Jurnal Bakti Masyarakat Manajemen Vol 3, No 2 (2023): Volume 3 Nomor 2 Tahun 2023
Publisher : Program Studi Manajemen Fakultas Ekonomi dan Manajemen Universitas Malahayati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jbmm.v4i1.16259

Abstract

Teknik pengelasan SMAW merupakan jenis pengelasan sederhana yang sering dimanfaatkan oleh Sebagian warga untuk menyambungkan berbagai jenis logam. Hingga saat ini Teknik pengelasan SMAW digunakan untuk kegiatan sehari – hari maupun mata pencaharian utama bagi masyarakat luas. Peluang penerapan jenis pengelasan ini akan menunjang produktifitas warga secara efisien. Potensi maupun bakat yang dimiliki setiap orang berbeda ketika melakukan pengelasan. Pelatihan Teknik pengelasan SMAW bagi warga dan mahasiswa muda universitas malahayati ini akan digunakan sebagai tutor serta peningkatan SDM terampil.
STUDI KASUS MORFOLOGI NANOFIBER POLIVINIL ALKOHOL (PVA) TERHADAP HIDROFOBISITAS PERMUKAAN YANG DINILAI DENGAN PENGUKURAN SUDUT KONTAK Berly, Yoga Maharesha; Rajagukguk, Tumpal Ojahan; Hendronursito, Yusup
Bhinneka Multidisiplin Journal Vol. 2 No. 4 (2025): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v2i4.71

Abstract

Nanofiber is a fiber measuring nanometers to micrometers, often used in the medical, energy, filtration, and other fields. The formation of nanofiber with the main ingredient, namely Polyvinyl Alcohol (PVA), this is because of its biodegradable, biocompatible, and chemically stable properties, but has the weakness of being easily degraded when in contact with water. This study examines the effect of electrospinning parameters on the morphology of 10% w/v PVA nanofiber, with parameters namely voltage of 10 and 12 kV, nozzle-collector distance of 10 and 15 cm. Morphological testing was carried out using a Field Emission-Scanning Electron Microscope (FE-SEM) and Contact Angle (CA) test. The test results show that PVA nanofiber has a fiber diameter with a value of NFZ.1; 80 - 406 nm, NFZ.2; 61.7 - 248.9 nm, with a continuous fiber structure and without significant defects, the resulting contact angle value of NFZ.1; 50.05o and NFZ.2; 38.75o, the contact angle value of NFZ.1 is higher than NFZ.2. The nanofiber with the smallest diameter is NFZ.2 and the largest contact angle value is NFZ.1. The results of this research show that the morphology of nanofiber significantly influences the contact angle value.
The local mineral potential from East Lampung - Indonesia: the use of basalt rock as a stone meal for cassava plant Hendronursito, Yusup; Barus, Junita; Amin, Muhammad; Muttaqii, Muhammad Al; Rajagukguk, Tumpal Ojahan; Isnugroho, Kusno; Birawidha, David Candra
Journal of Degraded and Mining Lands Management Vol. 7 No. 1 (2019)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2019.071.1977

Abstract

Indonesia has an abundant amount of basalt rocks resources, including in East Lampung Regency of Lampung Province. This basalt has not been used optimally and only be used as a foundation. The use of basalt as soil fertilizer also known as the stone meal. This study focused on the effect of using basalt dust on the growth and development of organic fertilizer application for the cassava plant. This study is to support the local government policies that declared Lampung as a national development centre of cassava, with a production rate of 30.8% of the national production of cassava. Basalt powder was characterized using test petrograph and X-ray Fluorescence (XRF) for a description of microscopic and chemical composition. The test results were used to determine the chemical composition of rock classification using the TAS diagram. The experiments of applying fertilizer on cassava crops in the demonstration plots 8 treatment x 3 repetitions were conducted by adding the percentage by weight of the basalt towards organic fertilizer between 0% (control 1), 10%, 20%, 30%, 40%, 50%, 60%, and without treatment (control 2). The results indicated that basalt from East Lampung is classified as olivine Tholeite basalt which is rich in CaO, Mg and Na2O + K2O. The growth rate of cassava plants which are affected by basalt powder presentation is characterized by a value which is higher than the value of CGR control, and recommended to not exceed 10% of the weight of basalt fertilizer.
Co-Authors Anang Ansyori Anshori, Anang Berly, Yoga Maharesha Birawidha, David Candra Hadi, Agung Efriyo Ibrahim, Fauzi Isnugroho, Kusno Junita Barus Marjuni, Teuku Muhammad Amin Muttaqii, Muhammad Al Prastyo, Adi Yunanto, Asep Yusup Hendronursito, Yusup