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All Journal Jurnal Simetris REKAYASA Machine : Jurnal Teknik Mesin Quantum Teknika Journal of Industial Engineering and Technology Prosiding Seminar Nasional Program Pengabdian Masyarakat
Yusuf, Mirza
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Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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Pengaruh Bentuk Geometri Papan Komposit Serbuk Kayu Terhadap Serapan Bising Ruang Yudhanto, Ferriawan; Rachmawati, Putri; Yusuf, Mirza; Dhewanto, Santo Ajie
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.31141

Abstract

This study aims to analyze the effect of variations in surface geometry on the acoustic performance of composite boards made from jackfruit sawdust waste. The material was combined with urea-formaldehyde adhesive and catalyst, then processed using a hot-press method at 160°C and 60 tons. The specimens were formed into four geometric variations, namely funnels, cones, tubes, and pillars, using a CNC machine. Tests were conducted using the impedance tube method over the frequency range of 200-1600 Hz to determine the sound absorption coefficient (α) and reflection coefficient (RC). The results show that the α value increases with increasing frequency. At low frequencies (200-400 Hz), the absorption capacity remains low but increases significantly at medium to high frequencies. The pillar geometry showed the best performance with a maximum α value of around 0.42 and the lowest reflection value. It indicates that modification of the surface geometry plays an important role in improving wave interaction and the effectiveness of sound absorption.
Pengolahan Intrusi Air Laut Menggunakan Sistem Hybrid Multistage Reverse Osmosis: Analisis Tds, Turbiditas, Dan Korelasi Kinerja Proses Yusuf, Mirza; Hakim, Iqbal Lukman; Hermawan, Andi; Mohammad Syaiful Anwar
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.31755

Abstract

Clean-water demand in coastal settlements has increased dependence on groundwater and may intensify water-quality deterioration caused by seawater influence, surface runoff, and local hydrogeological conditions. This study evaluates dug-well water quality in the South Depok Coastal area using Total Dissolved Solids (TDS) and turbidity, and examines the relevance of a hybrid multistage reverse osmosis (RO) system for raw-water treatment. Water samples were purposively collected from 10 community wells in January and May 2025. The mean TDS increased from 84.15 mg/L to 171.70 mg/L, while mean turbidity increased from 1.48 NTU to 5.81 NTU. The Pearson correlation between TDS and turbidity was positive, with r=0.74 in January, r=0.60 in May, and r=0.67 for the combined dataset. These results show that higher dissolved-solid concentrations tend to coincide with higher turbidity, although the relationship is affected by well-specific conditions, rainfall, suspended matter, and local hydrogeology. Although all TDS values remained below 500 mg/L, five May samples exceeded the 5 NTU turbidity threshold. A multistage treatment train consisting of sedimentation, multimedia filtration, cartridge filtration, pH-antiscalant conditioning, RO membrane separation, remineralization, and disinfection is therefore recommended to reduce particulate loading and stabilize treated-water quality. Future studies should report stage-by-stage permeate and concentrate data to validate membrane performance quantitatively.
Co-Authors Ade Irvan Tauvana andi hermawan Dhewanto, Santo Ajie Ferriawan Yudhanto, Ferriawan Hadi, Bima Soma Hakim, Iqbal Lukman Hanafi, M. Nur Syifa Sukmawan Herfani, Desta Amalia Holyness Nurdin Singadimedja Khairunnisa, Salwa Aghnia Laras, Arya Pandiko Lukman Nulhakim Mohammad Syaiful Anwar Mokhamad Is Subekti Nulhakim, Lukman Pamungkas, Elzandro Ragil Pangestu, Dwi Adi Prambandono, Bayu Purbajati, Dimas Pulung Putri Rachmawati, Putri Rachmanu, Fatkur Rachmawati, Fitri Lili Saputri, Auli Suciatno, Suciatno Syafrizal Syafrizal Widodo Widodo Wisnujati, Andika