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All Journal Jurnal Rekayasa Mesin Jurnal Abdi Insani International Journal of Mechanical Engineering Technologies and Applications (MECHTA)
Robittah, Ahmad
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Effect of Alkalization Duration and the Orientation of Fiber on Composites of Polyester Reinforced Fibre of Terap Tree (Artocarpus Elasticus) on Impact and Bending Strength Syarif, Akhmad; Sumantri, Dhenny; Robittah, Ahmad; Prayogi, Syafa'at
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.2

Abstract

Composite application has increased in recent years due to many advantages, e.g. In Kalimantan, there are many types of flora, one of which is the Terap tree (Artocarpus elasticus) which has a strong enough strength and is usually used by the Dayak people as clothing, hats, and rigging. In this research, we examine the laminate composite of tree skin fibers against bending strength and impact price. In making composites using a variety of alkali time, namely 60 minutes, 90 minutes and 120 minutes, the amount of alkali concentration used is 15% of the total volume of alkaline liquid. Then also use variations of fiber orientation 0o-900-00-900, 00-900-900-00, and 900-00-00-900. The impact test results showed that the highest value was obtained in specimens with an immersion time of 90 minutes with 00-900-00-900 orientation of 0.00294 joule / mm2 and the lowest value was found in specimens with immersion time 120 minutes 00-900-00-900 amounting to 0.00164 joules / mm2. While the Bending test obtained the highest value in specimens with 120 minutes of immersion time with 00-900-00-900 fiber orientation of 48.01 mph and the lowest value was obtained in specimens with 60 minutes immersion time at 900-00-00-900 for 16.62 MPa.
Analisis Kandungan Karbon dan Kekerasan Baja AISI 1020 dengan Variasi Media Karburasi Batubara Lignit dan Cangkang Telur Adawiyah, Rabiatul; Rahman, Noor; Sabitah, A'yan; Ardiyat, Ichwan Noor; Robittah, Ahmad
Jurnal Rekayasa Mesin Vol. 19 No. 3 (2024): Volume 19, Nomor 3, Desember 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i3.5937

Abstract

Karburisasi adalah proses perlakuan panas yang meningkatkan kekerasan dan ketahanan aus baja karbon rendah, seperti AISI 1020, yang sering digunakan dalam industri. Penelitian ini bertujuan untuk mengevaluasi pengaruh fraksi berat batubara lignit dan cangkang telur sebagai media karburasi terhadap kandungan karbon, kekerasan, dan struktur mikro baja AISI 1020. Karburasi dilakukan dengan lima variasi fraksi berat (60-100% batubara lignit dan 0-40% cangkang telur) selama dua jam, diikuti pendinginan udara. Kandungan karbon diukur menggunakan optical emission spectrometer (OES), kekerasan diuji dengan microvickers, dan struktur mikro dianalisis menggunakan scanning electron microscope (SEM). Hasil menunjukkan bahwa penambahan cangkang telur sebagai katalis meningkatkan kandungan karbon hingga 0,955%, dengan kekerasan tertinggi sebesar 3937 HV pada variasi 30% cangkang telur. Struktur mikro baja berubah dari dominasi ferit-perlit menjadi lebih banyak perlit-sementit. Kombinasi batubara lignit dan cangkang telur terbukti efektif dan ramah lingkungan
Effect of Alkalization Duration and the Orientation of Fiber on Composites of Polyester Reinforced Fibre of Terap Tree (Artocarpus Elasticus) on Impact and Bending Strength Syarif, Akhmad; Sumantri, Dhenny; Robittah, Ahmad; Prayogi, Syafa'at
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.2

Abstract

Composite application has increased in recent years due to many advantages, e.g. In Kalimantan, there are many types of flora, one of which is the Terap tree (Artocarpus elasticus) which has a strong enough strength and is usually used by the Dayak people as clothing, hats, and rigging. In this research, we examine the laminate composite of tree skin fibers against bending strength and impact price. In making composites using a variety of alkali time, namely 60 minutes, 90 minutes and 120 minutes, the amount of alkali concentration used is 15% of the total volume of alkaline liquid. Then also use variations of fiber orientation 0o-900-00-900, 00-900-900-00, and 900-00-00-900. The impact test results showed that the highest value was obtained in specimens with an immersion time of 90 minutes with 00-900-00-900 orientation of 0.00294 joule / mm2 and the lowest value was found in specimens with immersion time 120 minutes 00-900-00-900 amounting to 0.00164 joules / mm2. While the Bending test obtained the highest value in specimens with 120 minutes of immersion time with 00-900-00-900 fiber orientation of 48.01 mph and the lowest value was obtained in specimens with 60 minutes immersion time at 900-00-00-900 for 16.62 MPa.
SOSIALISASI SANITASI DAN HIGIENITAS DI LINGKUNGAN KERJA UD. SU’AIDI SALMAH Zaini, Muhammad; Salman, Yuliana; Hariyono, Muhammad Akbar; Tahdi, Muhammad; Robittah, Ahmad; Isna, Isna; Hazizah, Hazizah; Widyawati, Tri Aksari; Priyadi, Budi
Jurnal Abdi Insani Vol 12 No 10 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i10.2991

Abstract

Sanitasi dan higienitas merupakan faktor penting dalam menjamin mutu produk kesehatan dan kosmetika tradisional. Namun, masih banyak pelaku industri kecil yang menghadapi keterbatasan fasilitas dan kurangnya pemahaman tenaga kerja dalam penerapan prinsip sanitasi yang baik. Kondisi ini dapat meningkatkan risiko kontaminasi silang dan menurunkan kualitas produk. Oleh karena itu, diperlukan intervensi berupa sosialisasi dan edukasi yang tepat untuk memperkuat pemahaman pekerja terkait praktik sanitasi dan higienitas di lingkungan kerja. Tujuan kegiatan ini adalah meningkatkan pengetahuan dan pemahaman pekerja UD. Su’aidi Salmah tentang prinsip sanitasi dan higienitas dalam mendukung mutu dan keamanan produk bedak dingin Bunga Tanjung. Metode kegiatan dilakukan melalui ceramah interaktif yang dilengkapi dengan media presentasi power point dan brosur bergambar. Evaluasi pemahaman peserta dilakukan menggunakan instrumen pretest dan posttest, dengan indikator capaian skor >80 sebagai standar pemahaman baik. Hasil kegiatan menunjukkan adanya peningkatan pemahaman peserta, dengan nilai rata-rata pretest sebesar 93,64 dan meningkat menjadi 97,27 pada posttest. Sebelum sosialisasi, sebanyak 91% peserta memperoleh nilai di atas 80, sedangkan setelah kegiatan, seluruh peserta (100%) mencapai skor >80. Selain itu, peserta memberikan respon positif terhadap materi dan metode penyampaian, serta menunjukkan minat dalam menerapkan prinsip sanitasi di lingkungan kerja. Dukungan dari pengelola UD. Su’aidi Salmah turut menjadi indikator penting dalam menjamin keberlanjutan program. Kesimpulan kegiatan ini adalah sosialisasi sanitasi dan higienitas terbukti efektif dalam meningkatkan pemahaman peserta serta mendorong penerapan prinsip kebersihan di lingkungan kerja secara konsisten.
Co-Authors Akhmad Syarif Ardiyat, Ichwan Noor Hariyono, Muhammad Akbar Hazizah, Hazizah Isna Isna Muhammad Zaini Noor Rahman, Noor Prayogi, Syafa'at Priyadi, Budi Rabiatul Adawiyah Sabitah, A'yan Sumantri, Dhenny Tahdi, Muhammad Widyawati, Tri Aksari Yuliana Salman