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All Journal VALENSI Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of the Indonesian Tropical Animal Agriculture Chimica et Natura Acta Environmental and Materials
RAHMAT WIBOWO
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Front-matter (September 2021) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 46, No 3 (2021): September
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.46.3.%p

Abstract

Back-matter (September 2021) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 46, No 3 (2021): September
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.46.3.%p

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Back-matter (December 2021) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 46, No 4 (2021): December
Publisher : Diponegoro University

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Back-matter (December 2021)
Front-matter (December 2021) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 46, No 4 (2021): December
Publisher : Diponegoro University

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Front-matter (December 2021)
Perancangan Sistem Informasi Penilaian Siswa Berbasis Android Di Smp Negeri 1 Sungai Mandau Rahmat Wibowo; Feri Candra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Education is something that helps for the progress of the nation. Assessment is a process carried out to make decisions using information from learning outcomes. One of the problems at SMPN 01 Sungai Mandau, the assessment was carried out using paper so that there were many mistakes. This problem can be overcome by creating an information system that can help the teacher assessment process to make it faster and safer. Making this information system requires several important components, namely in the form of Java and XML programming languages for the Android system, while PHP, HTML, and CSS for web systems. The method that I use to create this information system is the waterfall method using the MySQL database. The author's testing is done by using usability testing and black-box testing methods. The results of the information system can make it easier for teachers to fill in student scores, students or parents to see the results of grades, sponsors to manage scholarships and IT employees in managing grades. Keywords: School, Assessment, Waterfall, Database.
Preparation of boron-doped diamond microelectrodes to determine the distribution size of platinum nanoparticles using current transient method Aliyah; Nurhidayat , Reza Rizqi; Afiten Rahmin Sanjaya; Rahmat Wibowo; Einaga, Yasuaki; Saepudin, Endang; Ivandini, Tribidasari Anggraningrum
Environmental and Materials Vol. 1 No. 1: (June) 2023
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v1i1.2023.117

Abstract

Boron-doped diamond (BDD) microelectrodes were prepared to investigate the correlation of hydrazine oxidation current responses with Pt nanoparticle (Pt NP) size distribution. The BDD film was grown on the surface of a tungsten needle with a diameter of 25 µm. An average particle size of around 5 µm BDD crystalline was successfully synthesized using a microwave plasma-assisted chemical vapor deposition technique. The Raman spectrum confirmed the presence of diamond formation as indicated by peaks corresponding to C-C sp3 bonds, while X-ray photoelectron spectroscopy spectrum showed the presence of C-H and C-OH bonds on the surface of the BDD microelectrode. Meanwhile the Pt nanoparticles was synthesized through reduction reaction of  PtCl62- solution using NaBH4 with citric acid as the capping agent. Particles size between 4.46 to 4.78 nm were observed by using TEM measurements. The BDD microelectrodes were utilized to investigate the relationship between Pt nanoparticle size distribution and the current generated from the oxidation reaction of 15 mM hydrazine in a 50 mM phosphate buffer solution pH 7.4 in the presence of 1.0 mL nanoparticle solutions. A current range of 5 and 6 nA with a noise level of 0.15 nA was observed showing a good correlation with the particle sizes of Pt NPs. Comparison was also performed with the measurements using Au microelectrodes, indicated that the prepared BDD microelectrodes is promising for the measurements of nanoparticle sizes distribution, especially Pt NPs.
Development of Photo Electrocatalytic Chemical Oxygen Demand Design (PECOD) Sensor using Highly Ordered Titanium Dioxide Nanotube Arrays Electrodes Utami, Chichi Amne; Syauqi, Muhammad Iqbal; Ningsih, Sherly Kasuma Warda; Wibowo, Rahmat; Gunlazuardi, Jarnuzi
Chimica et Natura Acta Vol 12, No 3 (2024)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v12.n3.49333

Abstract

Population growth, industrialization, and the need to ensure water quality have fostered the demand for analytical methods and tools to determine one of the important values of water quality standards. The oxygen demand of a given water matrix provides valuable information about the presence of organic compounds in a sample. The TiO2-based photoelectrocatalytic COD (PECOD) method offers a faster, more efficient, and more accurate alternative than conventional methods. Highly ordered TiO2 nanotube arrays (HOTNAs) were synthesized by anodizing titanium metal at 45V for 2 hours. HOTNAs/FTO photoanodes are used to oxidize organic compounds in water. HOTNAs/FTO photoanode has a bandgap of 3.4eV and a current density of 0.29 mA/cm2. Environmental samples were tested with the PeCOD sensor using glucose and mixed compound addition standards method. Water samples taken from local small ponds, namely Danau Kenanga, Danau Agathis, and typical wastewater of Laundry activity reveal COD values of 15,4659 to 15,9571 mg/L O2; 19,0500 to 19,6179 mg/LO2; 445,2336 to 449,7830 mg/L O2; respectively. The developed PECOD sensor performed well and provided analytical results that were not much different from conventional methods, with an error percentage below 10%.
Front-matter (March 2025) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 50, No 1 (2025): March
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.50.1.%p

Abstract

Front-matter (March 2025)
Back-matter (March 2025) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 50, No 1 (2025): March
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.50.1.%p

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Back-matter (March 2025)
Front-matter (June 2025) Wibowo, Rahmat
Journal of the Indonesian Tropical Animal Agriculture Vol 50, No 2 (2025): June
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.50.2.%p

Abstract

Front-matter (June 2025)
Co-Authors Afiten Rahmin Sanjaya Aliyah Einaga, Yasuaki Endang Saepudin, Endang Feri Candra Ivandini Tribidasari Anggraningrum Jarnuzi Gunlazuardi Nurhidayat , Reza Rizqi Sherly Kasuma Warda Ningsih Syauqi, Muhammad Iqbal Utami, Chichi Amne