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Jamasri .
Fakultas Teknik, Universitas Gadjah Mada, Yogyakarta
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PENGARUH PERLAKUAN ALKALI DAN SUSUNAN SERAT TERHADAP WATER ABSORPTION PADA KOMPOSIT HYBRID BERPENGUAT SERAT AGEL TENUN/SERAT GELAS/RESIN POLIESTER Hestiawan, Hendri; Jamasri, Jamasri; Kusmono, Kusmono
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9928

Abstract

The aim of this research is to investigate the effect of alkali treatments and stacking sequences on water absorption in hybrid composites of woven agel fiber/glass fiber/polyester resin. The research materials are woven agel fiber, E-200 glass fiber, unsaturated polyester resin Yukalac 157 BQTN and catalyst of methyl ethyl ketone peroxide (MEKP). The alkali treatment is carried out on the woven agel fibers by soaking the fiber in 5% NaOH solution for 1 hour. Then the fiber is washed with fresh water and dried for 48 hours. Manufacturing techniques used vacuum bagging with a suction pressure of 70 cmHg at room temperature. The amount of reinforcing fiber 7 fibers consists of 3 glass fibers and 4 agel woven fibers. The water absorption test uses a 3.5% NaCl solution for 1080 hours at room temperature. Water absorption test specimens based on ASTM D570 standards. Water absorption test results show that alkali treatment with glass fiber arrangement on the surface effectively holds the entry of water into hybrid composites. This can be seen from the decrease in maximum water absorption (Mm) and diffusion coefficient of hybrid composite, which are 8,67% dan 5,74 x 10-12 m2/s respectively.The aim of this research is to investigate the effect of alkali treatments and stacking sequences on water absorption in hybrid composites of woven agel fiber/glass fiber/polyester resin. The research materials are woven agel fiber, E-200 glass fiber, unsaturated polyester resin Yukalac 157 BQTN and catalyst of methyl ethyl ketone peroxide (MEKP). The alkali treatment is carried out on the woven agel fibers by soaking the fiber in 5% NaOH solution for 1 hour. Then the fiber is washed with fresh water and dried for 48 hours. Manufacturing techniques used vacuum bagging with a suction pressure of 70 cmHg at room temperature. The amount of reinforcing fiber 7 fibers consists of 3 glass fibers and 4 agel woven fibers. The water absorption test uses a 3.5% NaCl solution for 1080 hours at room temperature. Water absorption test specimens based on ASTM D570 standards. Water absorption test results show that alkali treatment with glass fiber arrangement on the surface effectively holds the entry of water into hybrid composites. This can be seen from the decrease in maximum water absorption (Mm) and diffusion coefficient of hybrid composite, which are 8,67% dan 5,74 x 10 -12  m2/s respectively
Airflow Channel-Integrated Structured Fabric for High-Efficiency Solar Desalination Polonia, Betti Ses Eka; Yuswanda, Ikko; Jamasri, Jamasri; Fikry, M J Mohammad; Muflikhun, Muhammad Akhsin
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 10 No. 1 (2026): June
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v10i1.31434

Abstract

The global shortage of freshwater and energy issues require the advancement of sustainable desalination technologies. This work introduces a novel structured fabric combined with an airflow channel for enhanced solar steam generation (SSG) efficiency. The instrument employs a synergistic composite of carbon fiber, serving as a wide-band photothermal absorber, and Tencel, which facilitates rapid capillary water movement due to its hydrophilic cellulose structure. Engineered airflow channels were incorporated into the evaporator design to surmount the thermodynamic limitations of stagnant vapor boundary layers. The findings indicate that a 5 mm channel width offers the ideal equilibrium between vapor diffusion and active photothermal surface area, resulting in a peak mass loss of approximately 1.75 kg/m² under 1 sun illumination. This layout markedly surpassed 2 mm, 10 mm, and non-channeled designs in both photothermal and convection-driven circumstances. This study presents a scalable and efficient approach to improving solar desalination by structural micro-environment alteration.
METODE PENANAMAN NILAI SOSIAL PADA SANTRI DI PONDOK PESANTREN SALAFIYAH DAN IMPLEMENTASINYA DALAM KEGIATAN MASYARAKAT PULUTAN LOR RW 02 KECAMATAN SIDOREJO KOTA SALATIGA TAHUN 2018 Jamasri, Jamasri; Nusarastriya, Yosaphat Haris
PKn Progresif : Jurnal Pemikiran dan Penelitian Kewarganegaraan Vol 13, No 2 (2018): Jurnal PKn Progresif, Vol. 13, No. 2 Desember 2018
Publisher : Program Studi Pendidikan Pancasila dan Kewarganegaraan FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/pknp.v13i2.26238

Abstract

This study is titled the method of planting social value in santri at the Salafiyah Islamic Boarding School RW 02, Sidorejo sub-district, Salatiga city in 2018. This type of research is a qualitative descriptive study with 45 research subjects as kyai and santri. Data was collected by observation, interviews, documentation, and questionnaires. Data analysis using qualitative descriptive techniques. The results showed that the method of planting social values used was the Sorogan and Bandongan methods. The embedded social values include discipline, empathy, respect, caring, and tolerance. The implementation of the social values of santri in community activities is to become a TPA worker, a large study committee and mutual cooperation. Keywords:  social values, santri, islamic boarding schools, community activities
Co-Authors A. E Tontowi Alva Edy Tontowi Alva Edy Tontowi Alva Tontowi Alva Tontowi, Alva Aris Budiyono Budi Rochardjo, Heru Santosa Dawal, Siti Zawiah Md. Dawal, Siti Zawiah Md. Duskiardi Duskiardi Fikry, M J Mohammad Gunesti Wahyu Handiko H. S Rochardjo Hendri Hestiawan Hendri Hestiawan Hendri Hestiawan Heru Santoso Budi Rochardjo Heru Santoso Budi Rochardjo, Heru Santoso Heru Santoso Budi Rochardjo, Heru Santoso Budi Iswanto, P.T. Iswanto, P.T. Khasanah, Rahayu Kuncoro Diharjo Kusmono Kusnanto Kusnanto Kusnanto Kusnanto M. Waziz Wildan M.N. Ilman M.N. Ilman, M.N. M.W. Wildan M.W. Wildan Mastariyanto Perdana Muhammad Akhsin Muflikhun Nur Subeki Orisanto Darma Setiawan Polonia, Betti Ses Eka R. Soekrisno Riyadi, S Rizky Arman Rochardjo, H. S S Riyadi S. A Widyanto Slamet Widyanto Slamet Widyanto, Slamet Subarmono Subarmono Subarmono Subarmono Sugiarto Suryadima Suryadima Susilo Adi Widyanto Susilo Widyanto Susilo Widyanto, Susilo Sutiarso Sutiarso Tjuk Oerbandono Tontowi, A. E Triyono Triyono Wenny Marthiana Widyanto, S. A Widyanto, Slamet A. Yosaphat Haris Nusarastriya Yovial Mahyoedin Yuswanda, Ikko