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All Journal E-Journal Widya Kesehatan dan Lingkungan Chimica et Natura Acta Journal of Tropical AgriFood Kumawula: Jurnal Pengabdian Kepada Masyarakat Scientia: Jurnal Hasil Penelitian Makara Journal of Technology West Science Agro
Yohan Yohan
The State Ministry of Research and Technology, Gedung II BPPT Lt. 8 – Jl. M.H. Thamrin 8 Jakarta 10340 Faculty of Fishery – University of Satya Negara Indonesia, Jl. Arteri Pondok Indah No. 11 Jakarta 12240
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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PENGOLAHAN AIR LIMBAH INDUSTRI : PREPARASI DAN KARAKTERISASI KOPOLIMER CANGKOK ASAM AKRILAT PADA FILM HDPE Yohan, Yohan; Nur, Rifaid M.; Hendrajaya, Lilik; Siraj, E. S.
E-Journal Widya Kesehatan dan Lingkungan 2005
Publisher : E-Journal Widya Kesehatan dan Lingkungan

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Abstract

Grafting pre-irradiation process of styrene monomer on high desity poluethylene (HDPE) film for hydrophilic membrane as membrane of cationic exchanger have been done. HDPE film is irradiated by y-ray then grafted by acrylic acid monomer in water. The preparation conditions at which the optimum grafting process are determined, such as rate and total dose of irradiation, monomer concentration, time and temperature of grafting. Characterization of some properties of the prepared grafted membranes were studied and accordingly the possibility of its practical use in fuel cell and in waste water treatment from toxic heavy metals, such as As, Cd, Co, Cu, Fe and Pb was investigated. Good relative condition to graft was using total dose of 45 kGy, dose rate was 7 kGy/hour, acrylic acid was 40% volume, grafting time was 90 minutes, and grafting temperature was 70oC gave percent of grafting HDPE-g-AA = 800-900% weight. The chelated metal ions were easily desorbed by treating the membrane with 0.1N HCl for 2 hours at room temperature. Finally, a mixture of there metals in the same feed solution was used to determine the selectivity of the membrane toward different metals. The results obtained for the prepared membranes showed a promise for their applicability in the removal of heavy metals from industrial wastewater.
DETEKSI URUTAN OLIGONUKLEOTIDA Mycobacterium tuberculosis SECARA VOLTAMMETRI MENGGUNAKAN SCREEN PRINTED CARBON ELECTRODE (SPCE) Hartati, Yeni Wahyuni; Yohan, Yohan; Nurmalasari, Ratna; Gaffar, Shabarni; Lubis, Rubianto A.
Chimica et Natura Acta Vol 4, No 2 (2016)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (204.19 KB) | DOI: 10.24198/cna.v4.n2.10674

Abstract

Mycobacterium tuberculosis merupakan bakteri penyebab tuberkulosis (TB). Pengembangan analisis secara biosensor DNA sangat menarik perhatian karena penerapannya mudah. Dalam penelitian ini telah dilakukan penentuan urutan pendek oligonukleotida M. tuberculosis gen RV0508 dari strain H37RV secara voltammetri pulsa differensial menggunakan screen printed carbon electrode (SPCE). Pendeteksian berdasarkan teknik hibridisasi urutan oligonukleotida probe yang diadsorpsi pada permukaan SPCE, dengan pasangan komplementernya dari DNA target, tanpa indikator hibridisasi, yaitu dengan mensubstitusi basa guanin probe dengan basa inosin. Respon hibridisasi berupa signal guanin DNA target di daerah potensial sekitar +0,9 V. Telah diperoleh korelasi linear antara arus puncak dengan konsentrasi DNA target pada rentang 5,0-20,0 µg/mL dengan batas deteksi 8,2 µg/mL.
Synthesis of Fuel Cell Membrane: Copolymerization of Styrene on ETFE Film by Grafted pre-Irradiation Yohan, Yohan; Nur, Rifai M.; Hendrajaya, Lilik; Siradj, E. S.
Makara Journal of Technology Vol. 9, No. 2
Publisher : UI Scholars Hub

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Synthesis of Fuel Cell Membrane: Copolymerization of Styrene on ETFE Film by Grafted pre-Irradiation. Preirradiation Grafting styrene monomer on ETFE film has been prepared. Research has been performed by γ-ray radiation at various total dose from 2.5 – 12.5 kGy and various dose rate from 1.3 – 1.9 kGy/hour. Irradiated copolymer is then grafted by styrene monomer in various solvent: ethanol, 2-propanol, and toluene, various concentration from 20 – 70% volume, various temperature from 50 – 90oC, and various grafting time from 2 – 12 hours. The results showed that percent of grafting is increase with increase of total dose and decrease of rate dose. The optimum experiment conditions are obtained at total dose 10 kGy, dose rate 1,9 kGy/hour, 2-propanol solvent, 40% volume styrene, 4 hours grafting time, and 70oC grafting temperature.
Sulfonation of cPTFE Film grafted Styrene for Proton Exchange Membrane Fuel Cell Yohan, Yohan
Makara Journal of Technology Vol. 11, No. 1
Publisher : UI Scholars Hub

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Abstract

Sulfonation of cPTFE Film grafted Styrene for Proton Exchange Membrane Fuel Cell. Sulfonation of γ-ray iradiated and styrene-grafted crosslinked polytetrafluoroethylene film (cPTFE-g-S film) have been done. The aim of the research is to make hydropyl membrane as proton exchange membrane fuel cell. Sulfonation was prepared with chlorosulfonic acid in chloroethane under various conditions. The impact of the percent of grafting, the concentration of chlorosulfonic acid, the reaction time,and the reaction temperature on the properties of sulfonated film is examinated. The results show that sulfonation of surface-grafted films is incomplete at room temperature. The increasing of concentration of chlorosulfonic acid and reaction temperature accelerates the reaction but they also add favor side reactions. These will lead to decreasing of the ion-exchange capacity, water uptake, and proton conductivity but increasing the resistance to oxidation in a perhidrol solution. The cPTFE-g-SS membrane which is resulted has stability in a H2O2 30% solution for 20 hours.
The Effect of Nutrient Composition on the Growth of Kale Plants in Hydroponic Systems Soelistianto, Farida Arinie; Yohan, Yohan; Suparwata, Dewa Oka; Marjan, M; Amaludin, Moh. Baitullah
West Science Agro Vol. 3 No. 02 (2025): West Science Agro
Publisher : Westscience Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58812/wsa.v3i02.1924

Abstract

This study reviews the impact of nutritional composition on the growth of kale (Brassica oleracea var. acephala) in hydroponic systems, synthesizing findings from 15 Scopus-indexed studies. The analysis highlights the critical roles of macronutrients (nitrogen, phosphorus, potassium) and micronutrients (iron, magnesium, zinc) in optimizing plant growth, yield, and quality. Additionally, it examines the importance of nutrient solution management, including pH, electrical conductivity, and nutrient concentration, for efficient nutrient uptake. Innovative practices such as organic additives and advanced monitoring systems are also discussed for their potential to enhance productivity and sustainability. The review identifies gaps in existing research, particularly in standardizing nutrient formulations and assessing the long-term impact on nutritional quality. These findings provide actionable insights for researchers and practitioners aiming to advance hydroponic kale cultivation.
The Impacts of Academic Services and Campus Atmosphere to Students’ Satisfaction and Retention Yohan, Yohan
Scientia: Jurnal Hasil Penelitian Vol. 3 No. 2 (2018): Scientia
Publisher : LP2M IAIN Syaikh Abdurrahman Siddik Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (436.259 KB) | DOI: 10.32923/sci.v3i2.1328

Abstract

Pelayanan akademik dan suasana kampus merupakan dua hal yang seringkali dapat menganggu kenyamanan dan kepuasan mahasiswa dalam proses penyelesaian kuliah. Melalui kajian yang dilakukan didapati bahwa dampak dari pelayanan kampus yang kurang prima dan suasana kampus yang kurang mendukung menyebabkan banyak mahasiswa yang merasa tidak nyaman berada di kampus dan tidak betah berlama-lama berada di dalam kelas. Disamping itu, terdapat beberapa dosen yang gagal memenuhi jumlah minimal kehadiran kelas. Sedangkan aktifitas konsultasi akademik yang dapat dimanfaatkan sebagai wadah dalam menyampaikan pesan-pesan akademik bagi keberhasilan mahasiswa belum sepenuhnya dimaksimalkan oleh sejumlah dosen dan juga mahasiswa yang bersangkutan. Akibatnya muncul ‘mis-komunikasi,’ sehingga banyak mahasiswa yang gagal meraih kepuasan dan kenyamanan akademik. Padahal kepuasan akademik dan kenyamanan dalam proses perkuliahan merupakan pendorong kesuksesan akademik mereka guna menghindari kegagalan penyelesaian kuliah. Oleh sebab itu diharapkan agar pihak yang berkompeten di kampus dapat meningkatkan pelayanan yang lebih prima dan mendorong para dosen, mahasiswa dan seluruh civitas akademikanya untuk terlibat secara aktif dalam membangun sekolah tinggi ini bagi kemajuan masa depan kampus agar dapat meminimalisir mahasiswa yang ‘drop out’ dengan menutup segala kekurangan yang ada.
PEMBERDAYAAN MASYARAKAT PESISIR DONGGALA DALAM BUDIDAYA MANGROVE DI KELURAHAN KABONGA KECIL KECAMATAN BANAWA KABUPATEN DONGGALA Suparman, Suparman; Tallesang, Mukhtar; Yohan, Yohan; Nurnaningsih, Nurnaningsih; Suirlan, Rita
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 9, No 1 (2026): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v9i1.66770

Abstract

This community service activity aims to empower coastal communities in Kabonga Kecil Village, Banawa District, Donggala Regency. A participatory approach (involving the community at every stage), educational efforts (providing training and outreach), and an economic-based approach (creating business opportunities from mangroves) are key to implementing this program. The method used is the Participatory Rural Appraisal (PRA) approach, combined with the concept of community-based development in coastal resource management. The results of this community service include the replanting of 500 mangrove seedlings in an abrasion-affected area of 1 hectare, with the involvement of approximately 25 people through mutual cooperation, consisting of community members, village heads, youth leaders, and the community service team, providing hope for the restoration of coastal ecosystems. In addition, an initial initiative was established in the form of a mangrove care group with 10 members, which synergizes with the Palu City Mangrovers community. In the economic aspect, it has been agreed to develop the area as a potential mangrove ecotourism destination, which is expected to become an alternative source of income for the local community.Kegiatan pengabdian ini bertujuan untuk melakukan pemberdayaan masyarakat pesisir di Kelurahan Kabonga Kecil Kecamatan Banawa Kabupaten Donggala. Pendekatan partisipatif (melibatkan masyarakat dalam setiap tahap), edukatif (memberikan pelatihan dan sosialisasi), serta berbasis ekonomi (menciptakan peluang usaha dari mangrove) menjadi kunci dalam pelaksanaan program ini. Metode yang digunakan melalui pendekatan Participatory Rural Appraisal (PRA) yang dipadukan dengan konsep community-based development dalam pengelolaan sumber daya pesisir. Capaian hasil pengabdian adalah menghasilkan penanaman kembali mangrove sebanyak 500 bibit di kawasan abrasi seluas 1 hektar dengan melibatkan sekitar 25 orang melalui gotong royong yang terdiri dari masyarakat, lurah, tokoh pemuda, dan tim pengabdian yang memberi harapan bagi pemulihan ekosistem pesisir. Selain itu, terbentuk inisiatif awal berupa 1 kelompok peduli mangrove yang beranggotakan 10 orang, yang bersinergi dengan komunitas Mangrovers Kota Palu. Dalam aspek ekonomi, telah disepakati pengembangan kawasan sebagai calon destinasi ekowisata mangrove, yang diharapkan menjadi sumber pendapatan alternatif bagi masyarakat lokal.
Upaya peningkatan ketahanan pangan kedelai melalui pengelolaan sumberdaya dan tanaman terpadu dengan pengaturan populasi tanam di Kabupaten Pasaman Provinsi Sumatera Barat Roswita, Rifda; Andullah, Syahrial; Irfan, Zul; Yohan, Yohan
Journal of Tropical AgriFood Volume 3, Nomor 1, Tahun 2021
Publisher : Department of Agricultural Products Technology, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35941/jtaf.3.1.2021.6124.41-48

Abstract

PPengaturan populasi tanaman merupakan salah satu komponen teknologi utama dalam PTT untuk meningkatkan produksi kedelai di Indonesia. Populasi tanaman yang optimum berkaitan dengan lingkungan spesifik dan varietas yang ditanam. Penelitian yang bertujuan untuk menentukan populasi tanaman optimal untuk varietas Anjasmoro berdasarkan parameter pertumbuhan dan hasilnya pada lahan sawah tadah hujan di Kabupaten Pasaman, Provinsi Sumatera Barat. Penelitian dilaksanakan dari April sampai September 2018. Tiga perlakuan populasi tanam, yaitu rapat (500 ribu tanaman/ha, jarak tanam 40x10 cm), sedang (333 ribu tanaman/ha, jarak tanam 40x15 cm), dan jarang (250 ribu tanaman/ha, jarak tanam 40x20 cm), ditata menurut rancangan acak kelompok dengan delapan ulangan. Parameter yang diamati meliputi komponen pertumbuhan (tinggi tanaman dan jumlah cabang per tanaman), komponen hasil (jumlah polong dan jumlah polong bernas per tanaman, persentase polong hampa, jumlah biji per tanaman dan bobot 100 biji), dan hasil biji kering per hektar. Data dianalisis menggunakan sidik ragam yang dilanjutkan dengan Uji Jarak Berganda Duncan. Hasil penelitian menunjukkan bahwa populasi tanam tidak berpengaruh nyata terhadap tinggi tanaman dan jumlah cabang per tanaman. Akan tetapi, pertumbuhan tanaman kedelai varietas Anjasmoro cenderung meninggi dan jumlah cabang per tanaman cenderung berkurang dengan semakin padatnya populasi tanaman. Populasi tanam berpengaruh nyata terhadap komponen hasil kedelai varietas Anjasmoro, kecuali bobot 100 biji. Produksi biji kering tertinggi (3,25 ton/ha) diperoleh dari perlakuan populasi tanam sedang (333.333 tanaman/ha dengan jarak tanam 40x15 cm) yang menghasilkan rata-rata 92,1 polong dan 89,4 polong bernas per tanaman, serta 178,3 biji per tanaman.
Co-Authors Amaludin, Moh. Baitullah Andullah, Syahrial Dewa Oka Suparwata E. S. Siradj E. S. Siraj Irfan, Zul Lilik Hendrajaya Lubis, Rubianto A. Marjan, M Nur, Rifai M. Nurmalasari, Ratna Nurnaningsih Nurnaningsih Rifaid M. Nur Rifaid Nur, Rifaid Rita Suirlan Roswita, Rifda Shabarni Gaffar Soelistianto, Farida Arinie Suparman Suparman Tallesang, Mukhtar Yeni Wahyuni Hartati