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All Journal Jurnal Teknik Kimia USU Jurnal Teknik Kimia USU Asian Journal of Toxicology, Environmental, and Occupational Health Jurnal Online Skripsi Manajemen Rekayasa Konstruksi (JOS-MRK)
Saputra, Richo
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Nursing Public Health Transportation Veterinary

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Pengaruh Jumlah Sel Elektroda Terhadap Produksi Gas Hidrogen dengan Proses Elektrolisis sebagai Sumber Energi Fuel Cell Erlinawati; Mahesi, Trin Zikir; Saputra, Richo; Febriana, Ida; Effendy A, Sahrul
Jurnal Teknik Kimia USU Vol. 14 No. 1 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i1.18064

Abstract

Hydrogen is an environmentally friendly, carbon-free renewable energy source that can be generated through reactions with oxygen to produce electricity. One method of producing hydrogen is via water electrolysis. The aim of this study was to determine the optimal conditions for hydrogen gas production, specific energy consumption, and the use of hydrogen gas as an energy source for Proton Exchange Membrane (PEM) fuel cells, using potassium hydroxide (KOH) at concentrations of 0.1 M, 0.2 M, 0.3 M, and 0.4 M. The electrolysis process was conducted at a voltage of 10 volts for 30 minutes. The results showed that the highest hydrogen gas production, 0.8927 L, was achieved with 18 electrode cells and a KOH concentration of 0.3 M. The optimal specific energy consumption was 33,269 joules under the same conditions. The maximum efficiency of the PEM fuel cell was 47.25%, while the minimum efficiency was 44.80%
Pengaruh Jumlah Sel Elektroda Terhadap Produksi Gas Hidrogen dengan Proses Elektrolisis sebagai Sumber Energi Fuel Cell Erlinawati; Mahesi, Trin Zikir; Saputra, Richo; Febriana, Ida; Effendy A, Sahrul
Jurnal Teknik Kimia USU Vol. 14 No. 1 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i1.18064

Abstract

Hydrogen is an environmentally friendly, carbon-free renewable energy source that can be generated through reactions with oxygen to produce electricity. One method of producing hydrogen is via water electrolysis. The aim of this study was to determine the optimal conditions for hydrogen gas production, specific energy consumption, and the use of hydrogen gas as an energy source for Proton Exchange Membrane (PEM) fuel cells, using potassium hydroxide (KOH) at concentrations of 0.1 M, 0.2 M, 0.3 M, and 0.4 M. The electrolysis process was conducted at a voltage of 10 volts for 30 minutes. The results showed that the highest hydrogen gas production, 0.8927 L, was achieved with 18 electrode cells and a KOH concentration of 0.3 M. The optimal specific energy consumption was 33,269 joules under the same conditions. The maximum efficiency of the PEM fuel cell was 47.25%, while the minimum efficiency was 44.80%
ANALISIS KUAT TEKAN BETON SELF-COMPACTING CONCRETE DENGAN ADIMIXTURE VISCOCRETE 3115N Saputra, Richo; Qomariah; Sugeng Riyanto
Jurnal Online Skripsi Manajemen Rekayasa Konstruksi (JOS-MRK) Vol. 3 No. 4 (2022): DESEMBER 2022
Publisher : Jurusan Teknik Sipil Politeknik Negeri Malang

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Abstract

Berkembangnya konstruksi dalam kehidupan sehari-hari mengalami kemajuan yang sangat pesat terutama ditinjau dari segi mutu beton pada konstruksi bangunan, Penelitian ini bertujuan untuk mengetahui perilaku dari sifat fisik komposisi adimixture ViscoCrete 3115N terhadap beton Self Compacting Concrete (SCC) dan demi terwujudnya dari penelitian ini peneliti menggunakan metode penelitian trial error. Penelitian Analisis Kuat Tekan Beton Self-Compacting Concrete Dengan Adimixture ViscoCrete 3115N bertujuan untuk mencari presentase superplasticizer ViscoCrete 3115-N untuk beton SCC mutu tinggi dengan metode tiral error, mencari nilai beton segar Slump-flow, V-Funnel, dan L-Box untuk beton SCC menggunakan ViscoCrete 3115-N, mencari hasil kuat tekan beton keras SCC menggunakan ViscoCrete 3115-N pada hari ke 7, 14, 21 ,dan 28, mencari biaya untuk beton SCC dengan menggunakan campuran ViscoCrete 3115-N. Untuk menganalisis tersebut membutuhkan pengujian di laboratorium. Hasil penelitian ini didapatkan komposisi yang tepat untuk beton SCC mengunakan ViscoCrete 3115N sebesar 1.5% dari berat semen, hasil dari Slump-Flow mix design no.6 sebesar 60,5 cm, V-Funnel dengan waktu 5,28 detik, nilai rasio L-Box 82,71% dan mix design no.7 dengan diameter Slump-Flow 60cm, V-Funnel dengan waktu 5,16 detik, nilai rasio L-Box 90,28%. Pada hasil pengujian kuat tekan beton SCC menggunakan ViscoCrete 3115N mengalami kenaikan kuat tekan beton rata-rata benda uji mix design no.6 dengan umur 7 hari diperoleh kuat tekan sebesar 23,02 MPa, umur 14 hari sebesar 25,98 Mpa, umur 21 hari sebesar 32,29 Mpa, umur 28 hari sebesar 41,24Mpa untuk mix design no.6 mencapai mutu rencana 40Mpa di hari ke 28. Sedangkan mix design no.7 umur 7 hari sebesar 23,28 MPa, umur 14 hari sebesar 25,58 Mpa, umur 21 hari sebesar 26,69 Mpa, umur 28 hari sebesar 30,11Mpa untuk mix design no.7 mutu yang direncanakan tidak tercapai dan memperoleh kuat tekan tertinggi sebesar 35,10 di hari ke 28. Pembuatan beton SCC mengunakan ViscoCrete pada mix design no.6 dan mix design no.7 didapatkan selisih harga sebesar Rp. 16,263.00.
The potential of tofu pulp waste as an alternative transport medium for vaginal swabs and wound samples Saputra, Richo; Khoirunnisa, Safira Rakhma; Azzahra , Siti; Anugrah , Syalwa Putri; Puspitasari , Dinda Risa; Patricia, Venny
Asian Journal of Toxicology, Environmental, and Occupational Health Vol. 3 No. 2: January (2026)
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/ajteoh.v3i2.2026.3615

Abstract

Background: Transport media are essential for preserving specimen integrity and maintaining microorganism viability during delays between collection and laboratory testing. Conventional transport media are often expensive, powder-based, and have limited shelf life after preparation, creating barriers in resource-limited settings. Tofu pulp waste, a nutrient-rich by-product containing fiber, protein, and minerals, may support bacterial survival while also reducing food waste. Methods: This laboratory-based experimental study assessed tofu pulp waste as an alternative transport medium for vaginal swabs collected at Mandala Rangkasbitung Community Health Center and infected wound swabs collected at Dr. Adjidarmo Rangkasbitung Regional General Hospital. The study was conducted at the Integrated Microbiology Laboratory of the Banten Ministry of Health Polytechnic, using purposive sampling. Specimens were transported in tofu pulp waste medium (intervention) or standard Amies medium (control) and then subjected to microscopy, bacterial culture, and Gram staining. Effectiveness was evaluated by comparing bacterial viability and recovery between media. Findings: The tofu pulp waste medium maintained microorganism viability in both specimen types. Culture and microscopy identified Gram-negative bacteria in wound swabs, including Citrobacter freundii and Proteus mirabilis, and showed normal vaginal flora and clue cells in vaginal swabs. Overall recovery patterns were comparable to those obtained using Amies medium. Conclusion: Tofu pulp waste has strong potential as a low-cost, environmentally friendly alternative transport medium that preserves bacterial stability until laboratory analysis. Novelty/Originality of this article: This article provides a new contribution to the field of clinical microbiology by demonstrating that tofu residue, a nutrient-rich byproduct of the food industry, can serve as an effective and stable bacterial transport medium.
Co-Authors Anugrah , Syalwa Putri Azzahra , Siti Effendy A, Sahrul Erlinawati Febriana, Ida Khoirunnisa, Safira Rakhma Mahesi, Trin Zikir Patricia, Venny Puspitasari , Dinda Risa Qomariah Sugeng Riyanto