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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Volatilitas : Jurnal Manajemen Dan Bisnis
Hamdani, Rizal
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Automotive Engineering Control & Systems Engineering Economics, Econometrics & Finance Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The Effect of Variation in Electrode Type and Area on Electrical Productivity of MFC With Sago Stem Substrate Ramadhan, Muhammad Nizar; Hamdani, Rizal
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 18 No. 2 (2024): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.18.2.144-154

Abstract

Microbial Fuel Cells (MFC) offer a promising solution for developing efficient and environmentally friendly alternative energy sources. MFCs convert chemical energy into electrical energy through anaerobic reactors equipped with anode and cathode electrodes containing substrates and microbes. This study investigates the effect of electrode type and area on the production of current, voltage, and power density using sago stem substrates in an MFC system enhanced with Lactobacillus plantarum. These bacteria play a critical role in facilitating electrolysis, thereby increasing electrical energy output. A dual-chamber MFC design was employed, testing electrode materials (copper, aluminum, nickel, and graphite carbon) and areas (30 cm², 40 cm², and 60 cm²). Measurements of current, voltage, and power density were taken over 36 hours. Results indicate that electrode area significantly influences voltage and current, while electrode type determines power density. The highest average power density, 432.953 mW/m², was achieved using nickel electrodes with a 30 cm² surface area. These findings underscore the importance of optimizing electrode properties to enhance the performance of MFCs.
PENGARUH SOCIAL MEDIA MARKETING TERHADAP CONSUMER PURCHASE INTENTION MELALUI CONSUMER ENGAGEMENT SEBAGAI VARIABEL MEDIASI (Studi Pada Toko Online Uniqlo Indonesia) Hamdani, Rizal; Ekowati, Titin; Rahmawati, Fitri
Volatilitas Jurnal Manajemen dan Bisnis Vol. 7 No. 2 (2025): VOLATILITAS - Jurnal Manajemen dan Bisnis
Publisher : Program Studi Manajemen, Fakultas Ekonomi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37729/volatilitas.v7i2.6233

Abstract

Internet mengubah pemasaran tradisional menjadi pemasaran online yang memudahkanproses komunikasi dan periklanan yang bertujuan untuk mengajak konsumen agar tertarik untukmembeli produk yang ditawarkan di sosial media. Strategi untuk meningkatkan minat beli konsumenadalah dengan social media marketing sehingga terciptanya consumer engagement dan akanberdampak pada consumer purchase intention. Penelitian ini bertujuan untuk menguji: (1) pengaruhsocial media marketing terhadap consumer purchase intention (2) pengaruh social media marketingterhadap consumer engagement (3) pengaruh consumer engagement terhadap consumer purchaseintention (4) menguji peran consumer engagement memediasi pengaruh social media marketing padaconsumer purchase intention.Populasi penelitian ini adalah seluruh pengikut halaman media sosial Instagram UniqloIndonesia. Sampel penelitian berjumlah 150 responden, teknik pengambilan sampel menggunakanteknik purposive sampling. Pengumpulan data menggunakan kuesioner yang diukur dengan skala likertyang terjawab secara lengkap sesuai kriteria dan memenuhi syarat validitas dan reliabilitas. Metodeanalisis data yang digunakan hierarchical regression analysis dan sobel test.Hasil penelitian ini menunjukan bahwa social media marketing berpengaruh positif dansignifikan terhadap consumer purchase intention, social media marketing berpengaruh positif dansignifikan terhadap consumer engagement, consumer engagement berpengaruh positif dan signifikanterhadap consumer purchase intention, consumer engagement memediasi pengaruh social mediamarketing pada consumer purchase intention secara partial mediation.Kata kunci: social media marketing, consumer engagement, consumer purchase intention.
Co-Authors Fitri Rahmawati Muhammad Nizar Ramadhan Titin Ekowati