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All Journal Jurnal Sains dan Seni ITS TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Pengabdian Kepada Masyarakat SEWAGATI
Hendro Juwono
Institut Teknologi Sepuluh Nopember
Agriculture, Biological Sciences & Forestry Arts Humanities Computer Science & IT Education Environmental Science Other

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Novel pH sensor based on fiber optic coated bromophenol blue and cresol red Fredy Kurniawan; Baginda Zulkarnain; Mohammad Teguh Hermanto; Hendro Juwono; Muhammad Rivai
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 2: April 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i2.9993

Abstract

Fabrication of pH sensor based on fiber optic coated bromophenol blue and cresol red has been done. Briefly, jacket in the middle part of the fiber optic was removed for 5 cm. Then the core of each of fiber optics was washed in ethanol. Nitric acid, demineralized water, and ethanol again consecutively. Then the cleaned core was coated using active material using sol-gel immobilization technique. Tetraehyl orthosilicate was used as a binder in the immobilization of active materials. Bromophenol blue will start change the color to yellow at below pH 3.00±0.01 and blue at above pH 4.60±0.01, while the cresol red will start change the color to yellow at below pH 7.20±0.01 and violet at above pH 8.80±0.01. The pH sensors which have been made show the sigmoidal response over pH from 1.00±0.01 to 11.00±0.01. The sensor has a better performance in comparation with the other sensor.
Adsorpsi Zat Warna Remazol Brilliant Blue R Menggunakan Nata de coco : Optimasi Dosis Adsorben dan Waktu Kontak Puspita Hidayati; Ita Ulfin; Hendro Juwono
Jurnal Sains dan Seni ITS Vol 5, No 2 (2016)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (553.273 KB) | DOI: 10.12962/j23373520.v5i2.18153

Abstract

Adsorpsi  zat  warna Remazol  Brilliant  Blue  R (RBBR) menggunakan adsorben nata de coco telah dilakukan. Proses adsorpsi dilakukan dengan metode Batch pada variasi dosis adsorben 0,02-3 gram dan waktu kontak 5-120 menit. Kondisi adsorpsi yang optimal menghasilkan efisiensi pengurangan kadar zat warna RBBR yang paling tinggi. Hasil adsorpsi zat warna RBBR optimal pada dosis adsorben 0,1 gram dengan persentase adsorpsi sebesar 95,815% dan waktu kontak 60 menit dengan persentase adsorpsi 96,618%
BUDIDAYA MELON MENGGUNAKAN METODE HIDROPONIK FERTIGASI TETES DI DUSUN PACUL GOWANG, JATIREJO, DIWEK JOMBANG Yatim Ni'mah; Suprapto Suprapto; Harmami Harmami; R. Djarot; Fredy Kurniawan; Ita Ulfin; Hendro Juwono; Zeni Rahmawati; Yunia Anisa Putri; Palupi Irene Desilvia; Safira Aulia; Rajwa Abidah Sudjarwo; Ardhelia Maura Felisia
Sewagati Vol. 4 No. 2 (2025): SEWAGATI
Publisher : Fakultas Teknik dan Informatika Universitas PGRI Mahadewa Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59819/sewagati.v4i2.5630

Abstract

Pacul Gowang Hamlet is one of the hamlets located in Jatirejo Village, Diwek District, Jombang Regency. Most of the residents of this hamlet work as farmers with main commodities such as rice, corn, and vegetables. However, the farming method used is still traditional, namely planting directly in the soil, which often results in suboptimal yields. The problems faced include unproductive land, low farmer income, lack of knowledge regarding modern cultivation technology, and limited understanding of post-harvest handling and product marketing. This community service program was carried out based on a situation analysis and discussions with local farmers. The purpose is to provide a solution by introducing the hydroponic drip fertigation system, a technique of supplying nutrients through drip irrigation controlled by a timer with high precision. This system was chosen because it is more efficient in water and nutrient usage, reduces the risk of crop failure, and can be applied to limited land areas. The crop cultivated is the Sweet Net 9 melon variety, which has a high market value and stable demand, such as from supermarkets and restaurants. This activity involved 10 KKN (Community Service Program) students to utilize idle land in order to produce high-quality horticultural products, thereby increasing the income and welfare of the Pacul Gowang Hamlet community.
Co-Authors Ardhelia Maura Felisia Baginda Zulkarnain Fredy Kurniawan Harmami Harmami Ita Ulfin Mohammad Teguh Hermanto Muhammad Rivai Palupi Irene Desilvia Puspita Hidayati R. Djarot Rajwa Abidah Sudjarwo Safira Aulia Suprapto Suprapto Yatim Ni'mah Yunia Anisa Putri Zeni Rahmawati