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All Journal INOTEKS : Jurnal Inovasi Ilmu Pengetahuan, Teknologi, dan Seni FLYWHEEL : Jurnal Teknik Mesin Untirta Planta Tropika Conference SENATIK STT Adisutjipto Yogyakarta Angkasa: Jurnal Ilmiah Bidang Teknologi Community Development Journal: Jurnal Pengabdian Masyarakat Jurnal PADMA: Pengabdian Dharma Masyarakat Vortex Jurnal Peradaban Masyarakat (JPM) Mestaka: Jurnal Pengabdian Kepada Masyarakat AME (Aplikasi Mekanika dan Energi) : Jurnal Ilmiah Teknik Mesin Hikamatzu Journal of Multidisciplinary Research Journal of Integrated Knowledge and Innovation
Fajar Nugroho
Institut Teknologi Dirgantara Adisutjipto
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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Distribution of Soil Density Values in Various Agricultural Lands in Jatipurno Sub-district, Indonesia Mujiyo, Mujiyo; Nugraha, Meilissar Salahuddin Alif Rahman; Suyana, Jaka; Herawati, Aktavia; Nugroho, Fajar
PLANTA TROPIKA Vol. 14 No. 1 (2026)
Publisher : Department of Agrotechnology, Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.v14i1.28122

Abstract

Soil density is a crucial parameter for soil physical health. It influences the ability of plant roots to penetrate the soil, which in turn impacts the plant's absorption of water and nutrients. The research was conducted in Jatipurno Subdistrict, Wonogiri Regency, to determine the distribution of soil density, the influence of sources of diversity, the determinants of soil density, and recommendations for land use. Descriptive exploratory research through survey and laboratory analysis was employed in this study, with soil density measured using the Dynamic Cone Penetrometer (DCP). The quite high soil density class covers 2,631.28 ha (60.51%), and the high soil density class covers 1,716.87 ha (39.49%). Land use did not significantly affect soil density, whereas soil type, slope gradient, and rainfall did. Soil density values have a significant positive correlation with bulk density (r = 0.862; P-value = 0.000; N = 45) and texture (r = 0.572; P-value = 0.000; N = 45), and have a significant negative correlation with water content (r = -0.457; P-value = 0.002; N = 45), porosity (r = -0.699; P-value = 0.000; N = 45), and organic C (r = -0.404; P-value = 0.006; N = 45). These five parameters were selected as determining factors, increasing bulk density and texture (clay content), and decreasing water content, porosity, and organic C will increase soil density. Improved land management, based on these determining factors, is needed to increase agricultural land use for sustainable agricultural production, such as mulching, increasing organic matter content, and minimal tillage to maintain soil surface moisture.
Studi Pengaruh Kecepatan Putaran Rotating Tool Friction Stir Welding (FSW) Terhadap Kekuatan, Kekerasan Dan Struktur Mikro Aluminium AA 2024-T3 Fajar Nugroho; Nurfi Ahmadi; Eko Yulianto
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol. 9 No. 1 (2023)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/ame.v9i1.122

Abstract

Dalam pengelasan FSW kecepatan putaran rotating tools merupakan salah satu faktor penting yang menentukan kualitas sambungan las. Dalam penelitian ini digunakan material aluminium AA 2024-T3 dengan kecepatan putar rotating tools sebesar 900 rpm, 1500 rpm dan 2280 rpm, serta kedalaman pin sebesar 3,5 mm dan kecepatan feed rate 18 mm/menit. Selanjutnya terhadap hasil sambungan las FSW dilakukan pengujian kekuatan tarik, pengujian kekerasan dan struktur mikro. Berdasarkan dari hasil pengujian sifat mekanik tersebut dapat dilihat bahwa kecepatan putaran rotating tools mempengaruhi nilai kekuatan tarik, nilai kekerasan dan struktur mikro dari sambungan las. Semakin tinggi putaran menyebabkan meningkatnya kekuatan tarik dan kekerasan. Namun peningkatan tersebut tidak berjalan kontinyu karena pada putaran yg tinggi perlu dilakukan penyesuaian terhadap feed rate pengumpanannya. Dalam penelitian ini hasil optimal diperoleh pada putaran rotating tools 1500 rpm dimana kekuatan tarik sebesar 236,93 MPa dan nilai kekerasannya sebesar 137,3 VHN. Dari pengamatan struktur mikro menunjukan adanya perubahan butiran pada area nugget zone akibat pengaruh putaran rotating tools. Kata kunci : aluminium 2024-T3; FSW; kekerasan; kekuatan tarik; struktur mikro.
Pemanfaatan Teknologi Unmanned Aerial Vehicle (UAV) Dalam Bidang Pertanian Untuk Mendukung Ketahanan Pangan Fajar Nugroho; Dedet Hermawan Setiabudi; Abdul Haris Subarjo; Adi Setiawan; Djarot Wahju Santoso; Nurfi Ahmadi; Bambang Sudibya; R. Nur Ahmad Triwibowo
Journal of Integrated Knowledge and Innovation Vol. 2 No. 1 (2026): Vol.2 No.1 2026
Publisher : Universitas Pahlawan Tuanku Tabusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jiki.v2i1.37

Abstract

Perkembangan teknologi cukup pesat, salah satu perkembangan teknologi tersebut penggunaan Unmanned Aerial Vehicle (UAV). Penggunan UAV telah dilakukan pada beberapa bidang, diantaranya bidang pertanian. Berdasarkan kajian literatur jurnal nasional dan internasional, penggunaan UAV terbukti sangat efektif meningkatkan presisi dan efisiensi pada bidang pertanian, keuntungannya meminimalkan dampak negatif terhadap lingkungan serta kesehatan petani. Teknologi UAV menawarkan solusi modern bagi petani dalam meningkatkan efisiensi, keamanan, dan keberlanjutan produksi hasil pertanian Diharapkan dengan efisiensi meningkat dapat mendukung program pemerintah meningkatkan ketananan pangan.
Pengaruh Variasi Fraksi Volume Komposit Hibrid Serat Sabut Kelapa-Serat Rami-Epoxy Terhadap Kekuatan Tarik, Kekuatan Impak dan Karakteristik Patahan Fajar Nugroho; Dwi Hartini; Nurfi Ahmadi; Nur Akhmad Triwibowo; Fahril Khairullah
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 3 (2026): Agustus
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i3.4003

Abstract

Natural fiber-reinforced hybrid composites have attracted considerable attention as environmentally friendly materials owing to their low density, renewability, and promising mechanical properties. However, studies investigating the combined effect of coconut coir fiber and ramie fiber volume fractions on the tensile strength, impact resistance, and fracture characteristics of epoxy-based hybrid composites remain limited. This study aims to evaluate the influence of different volume fraction combinations of coconut coir fiber and ramie fiber on the mechanical performance and fracture behavior of hybrid composites. Composite specimens were fabricated using the hand lay-up method with an epoxy matrix. Tensile and impact tests were conducted according to ASTM D3039 and ASTM D6110, respectively, followed by macro-fracture observation and scanning electron microscopy (SEM) analysis to identify dominant failure mechanisms. The results indicate that the hybrid composite containing 15% coconut coir fiber and 15% ramie fiber exhibited the highest tensile strength of 19.58 MPa and the highest impact strength of 16.9 kJ/m². This balanced fiber composition promoted more uniform stress distribution, improved fiber–matrix interfacial bonding, and reduced the occurrence of voids and fiber pull-out compared with other compositions. Fractographic analysis confirmed that enhanced interfacial adhesion contributed to improved mechanical performance. These findings demonstrate that optimizing the volume fraction of hybrid natural fibers is an effective approach for improving the tensile, impact, and fracture properties of epoxy-based hybrid composites
Co-Authors Abdul Haris Subarjo Abdul Haris Subarjo abdul haris subarjo, abdul haris Adi Setiawan Ahmad A, Dadang AKTAVIA HERAWATI Among Herahli Anna Prattiwi, Elisabeth Anna Bachtiar, Muhamad Irfan Bambang Sudibya Bambang Sudibyo Dedet Hermawan Setiabudi Dedet Hermawan Setiabudi Dedet Hermawan Setiabudi, Dedet Hermawan Djarot Wahju Santoso Djarot Wahju Santoso Dwi Hartini Eko Yulianto Eli Kumolosari Fahril Khairullah Freddy Kurniawan GUNARSO GUNARSO Irfansyah, Rahmat Jaka Suyana Kurniawan, Muh. Firdaus Agung Kunto Kusumawardani, Mawar Laia, Dominikus Yoeli Wilson Mahardhika, R. Hernan Maizetri, Resti Mawar Kusumawardani Muga, Yohanes Fernando Leo Mujiyo Nugraha, Meilissar Salahuddin Alif Rahman Nur Akhmad Triwibowo Nurcahyani Dewi Retnowati Nurfi Ahmadi Nurfi Ahmadi Nurfi Ahmadi Nurfi Ahmadi, Nurfi Octavia, Dyla Midya Okto Dinaryanto Pinandhita, Lazuardy Rahendra Prattiwi, Elisabeth Anna R. Nur Ahmad Triwibowo Resa Fadhol Ilahi Santoso, Prasidananto Nur Sarif Hidayat, Sarif Sri Widata Sudarmanto Sudarmanto Sudarmanto Sudarmanto, Sudarmanto sudarmanto, Sudarmanto sudarmanto Teguh Wibowo Triwibowo, Nur Ahmad Wibowo, Irfan