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All Journal Jurnal Bestari Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development TEKNIK MEDIA KOMUNIKASI TEKNIK SIPIL METANA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Bahan Alam Terbarukan Waste Technology Eksergi: Chemical Engineering Journal Techno: Jurnal Penelitian Journal of Engineering and Technological Sciences Majalah Ilmiah MOMENTUM ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika International Journal of Artificial Intelligence Research Jurnal Ekonomi dan Bisnis Indonesian Journal of Chemistry Jurnal Aplikasi Teknologi Pangan Indonesia Journal of Halal PRoMEDIA Journal of Innovation in Business and Economics Andalas obstetrics and gynecology journal ASEAN Journal of Chemical Engineering Budimas : Jurnal Pengabdian Masyarakat Jurnal Teknik Kimia Indonesia Jurnal Pengabdian dan Peningkatan Mutu Masyarakat (JANAYU) Jurnal Ilmu Sosial Indonesia (JISI) Jurnal Energi Baru dan Terbarukan Jurnal Manajemen Bisnis dan Kewirausahaan Journal of Bioresources and Environmental Sciences Jurnal Riptek Eduvest - Journal of Universal Studies Jurnal Profesi Insinyur Indonesia Journal of Bioresources and Environmental Sciences International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis JURNAL REKAYASA KIMIA & LINGKUNGAN
. Widayat
Chemical Engineering Department, Faculty Of Engineering, Diponegoro University, Jl. Prof. Soedarto, SH, Tembalang, Semarang 50275
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Analisis Pengaruh Perbandingan ΔT terhadap Optimasi Energi dengan Metode Problem Table Widayat, W; Ihsan, Ahmad Nur; Santosa, Edward Emannuel; Hazim, M. Syafiq; Simbolon, Natalia Lydia Efrata; Puteri, Safira Rizkya
Jurnal Profesi Insinyur Indonesia Vol 3, No 4 (2025): JPII
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/potensi.%Y.28250

Abstract

Problem table analysis adalah metode kuantitatif dalam teknologi pinch untuk menghitung kebutuhan minimum panas (hot utility) dan pendinginan (cold utility) pada sistem termal industri. Dengan menyusun data suhu dan entalpi dalam bentuk tabel, metode ini membagi fluida ke dalam interval suhu berdasarkan ΔTmin, lalu menghitung surplus atau defisit energi di setiap interval melalui neraca entalpi. Hasil divisualisasikan sebagai heat cascade untuk menentukan titik pinch dan batas pemanfaatan panas internal. Analisis pada ΔTmin 10–28°C menunjukkan bahwa semakin besar ΔTmin, semakin besar kebutuhan hot utility, sementara cold utility mengalami fluktuasi akibat variasi distribusi panas, karakteristik stream dan konfigurasi aliran. Pemilihan ΔTmin yang tepat penting untuk menyeimbangkan efisiensi energi internal dengan konsumsi energi eksternal, guna mencapai desain jaringan penukar panas yang optimal, efisien dan ekonomis. Kata kunci: problem table, optimasi, suhu
The Effect of Perception of Ease of Use and Quality of Service on the Willingness to Adopt myBCA Mobile Banking with Trust as a Mediating Variable Purbantoro, Denia Azizah; Widayat, Widayat
Jurnal Manajemen Bisnis dan Kewirausahaan Vol. 6 No. 1 (2026): MARCH
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jamanika.v6i1.42771

Abstract

This study aims to examine the effect of Perceived Ease of Use and Service Quality on the Willingness to Use the myBCA mobile banking application of Bank Central Asia, with Trust as a mediating variable. A quantitative survey design was employed involving 384 active myBCA users in Malang, Indonesia (n = 384), selected through accidental sampling. Data were analyzed using multiple linear regression and path analysis with SPSS 29. The key variables analyzed include Perceived Ease of Use, Service Quality, Trust, and Willingness to Use Technology. The results indicate that Perceived Ease of Use (β = 0.338; t = 7.008; p < 0.001) and Service Quality (β = 0.385; t = 7.981; p < 0.001) have positive and significant effects on Willingness to Use. Both Perceived Ease of Use (β = 0.245; p < 0.001) and Service Quality (β = 0.241; p < 0.001) significantly influence Trust, which in turn significantly affects Willingness to Use (β = 0.233; p < 0.001). The indirect effects through Trust (0.057 and 0.056) are smaller than the direct effects, indicating partial mediation, confirmed by Sobel test values of 3.888 and 4.189 (p < 0.05). The model explains a substantial proportion of variance in user willingness (R² = 0.259). Theoretically, this study extends the Technology Acceptance Model by integrating service quality and trust within a contemporary digital banking context. Practically, the findings highlight the strategic importance of enhancing system usability and service excellence to strengthen user trust and increase technology adoption. These results imply that trust-building mechanisms are pivotal in accelerating sustainable digital banking adoption in Indonesia. Overall, the study underscores that ease of use and service quality, reinforced by trust, form a critical foundation for advancing mobile banking utilization.
Methyl ester production from high free fatty acid content with Ce/Zeolite bifunctional catalyst Syahidah, Aisyah Sabrina Nurul; Wilujeng, Dinanti Putrisia; Widayat, W.; Hadiyanto, H.; Sulardjaka, S.; Ngadi, Noorzita
International Journal of Renewable Energy Development Vol 15, No 3 (2026): May 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61945

Abstract

The production of methyl esters from high free fatty acid (FFA) feedstock remains a critical challenge in biodiesel processing, particularly when using Palm Acid Oil–waste cooking oil (PAO–WCO) with an initial FFA content of 53.21%. Such high FFA content significantly reduces reaction efficiency and necessitates a conventional two-step process involving esterification to lower the FFA level followed by transesterification to convert triglycerides into methyl esters. This multistep approach limits process efficiency and increases operational complexity for high-FFA feedstock. This study investigates the use of a bifunctional Ce/Zeolite catalyst to enable simultaneous esterification and transesterification in a single-step process for high FFA content oil. The zeolite support was synthesized from geothermal waste, and cerium was incorporated via impregnation. The catalyst was characterized using SEM–EDX, X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) surface area analyses. The reaction was conducted under various operating conditions, including different temperatures and catalyst loadings. The Ce/Zeolite catalyst exhibited effective bifunctional activity, enhancing the simultaneous conversion of FFAs and triglycerides in high FFA content feedstock. The optimum conditions were a methanol-to-oil molar ratio of 12:1, 4 wt% catalyst loading, and a reaction temperature of 50 °C for 180 min. Under these conditions, FAME concentration of 91.5% was obtained, with FFA conversion of 25.31% (reduction of 13.47% FFAs from initial 53.21%) achieved in a single-step transesterification process. These results demonstrate that Ce/Zeolite is a promising bifunctional catalyst for the efficient processing of high FFA content oil, offering a simplified and more sustainable pathway for industrial biodiesel production.
Co-Authors A Abdullah A Abdurrakhman A. Sadikky DP Abdullah Abdullah Achmad Roesyadi Achmad Roesyadi Achmad Wildan ADE ARTA, MOCHAMAD ZAINUDIN Adi Darmawan Adit Rizky Wicaksono Afriani, Nurfika Agus Suprihanto Ahmad Juanda Ahmad Ni’matullah, Albaari Ahmad Nur Ihsan Aini, Apsari Puspita Aji Baharsyah Aji Prasetyaningrum Aji, Satriyo Akbar Asfar, A.M. Iqbal Al-Baari, Ahmad N Al-Baarri, Ahmad Ni'matullah Al-Baarri, Ahmad Ni’matullah Alfareza, Muhammad Ircham Almaas Salwa, Diah Ayu Andi Friadi Andika Pradifan Andrew Bryano Kermite, Andrew Bryano Andri Cahyo Kumoro Andri Cahyo Kumoro Andrianto, Novian Andry Anggoro Arahim Anggra Widhi Anggra Widhi Anik Sarminingsih, Anik Annisa Metantya Maharani Aprilina Purbasari Ari Eko Prasetyo Ari Eko Prasetyo Ariadi, Ariadi Arianti Nuur Annisa Arief Budiman Aris Triwiyatno Arman, Mhd. Adithia Perdana Arwan, Berriandi Aulia, Haris Nu’man B Budiyono Bacthiar, Hafni Bagus Agang Sudrajat Bakti Jos Bambang Cahyono Bambang Sudarsono Banowati, Tria Nita Berkah Fajar Tamtomo kiono Bernike Vemmialia Jonfita Budi Warsito Budianto, Irawan Arief Catur Pramono D. Ingrid A D. Soetrisnanto Dani Puji Utomo Danny Soetrisnanto DENNY SANJAYA Dessy Ariyanti Devina Ingrid A. Dita Ayu Sofiati Driastuti, Faradilla Dyah Hesti Wardhani Edward, Leonardo Ela, Hulasoh Elysia, Alvina Enda Merizki br Ginting Fauzan, O. K. Muhammad Fauzandy Husna Setyanto Favian Nafiega Ferdy D, Erbert Fistcar, Wawarisa Alnu H Hadiyanto H M Rachimoellah H Satriadi H. Anggraeni H. Satriadi H. Satriadi Hadiyanto Hadiyanto Hamzah, Fazlena Hanapi bin Mat Hanapi bin Mat Handung Nuryadi Hanifa Zakiyatul Urbach Hantoro Satriadi Hantoro Satriadi Hantoro Satriado Hapsari, Farida Diyah Haris Nu'man Aulia Haris Nu’man Aulia Hasanah, Alfi Hazim, M. Syafiq Hendra Try Ardianto Hendro, Andika Herlambang, Andy Rahmadi Heru Susanto Hesti Rahayu I Nyoman Widiasa I. Hartati Ika Windrianto K. Handono Indah Hartati Iqbal Mubarak Irawan Arif Budianto Johnner P Sitompul Khoirun Nisa Kurdianto Kurdianto Kurnia, Atik Kusmiyati, K Lestari, Dwi Fitri Lukman Hakim Firdaus Luqman Buchori M. Djaeni M. Hadi M. Hadi M. Hadi Makrufah Hidayah I Manulang, Amanda Nathalia Harti Marusaha Marcelinus Christwardana Maria Siahaan Marta Chandra Anikke Putri Masyhad Masyhad Meiny Suzery Melati, Emilla Mochamad Arief Budihardjo MSK. Tony Suryo Utomo Muchammad Muchammad Muhammad Farizan Praevia Muhammad Hilmazar Hawari Muhammad Rachimoellah Muhammad Rachimoellah Muhammad Syukri Hasan Muhammad Syukri Hasan Nabilla Salma Listyawijayanti Nasir, Yahya Ndaru Okvitarini Ngadi, Noorzita Ngadiwiyana M.Si. S.Si. Ngurah Widiantara Ni'matuzahroh Ni'matuzahroh Novianti, Khusnul Rofida Noviyanto, Sigit Nur Rokhati Nurjannah, Rifa Nurul Yaqin Pandapotan, Boris Poltak Prakoso, Satrio Budi Prakoso, Satyo Jati Prasetyo, Ahmad Wisnu Pratomo, Shendy Eko Priyosetyoko Priyosetyoko, Priyosetyoko Puja Chrisdianto Manapa Purbantoro, Denia Azizah Puteri, Safira Rizkya Putri, Sylvia Rahmi Rahmania, Yusi Luluk Ratnawati Ratnawati Ratnawati, Ida Razak, Habibie Rheza Dipo Ridani, Nuraida Riky Yonas Riky Yonas Riva Amrulloh Roz, Kenny S Suherman S Supriyandi salsabila, elvira Samudra, Makitta Widi Santosa, Edward Emannuel Saudale, Jeanette Mutiara Paula Sekarningtyas, Nazifa Seno, Abdi Setia Budi Sasongko Setia Budi Sasongko Setiabudi, Herma Dina Setiadi, Muhammad Irfan Sianturi, Aurelia Genesya Silviana Silviana Silviana, S Simbolon, Natalia Lydia Efrata Siti Nur Khairunisa Aroli Sonya Hakim Raharjo Sri Nastiti Andharini Sri Puji Lestari Sri Widodo Agung Suedi Sri Widodo Agung Suedy Sriatun Sriatun Striadi, H. Sugiyanto - Sulardjaka Sulardjaka Sulardjaka, S Sulardjaka, S. Sulastri, Cucu Sumiati Sumiati Suroso Agus Saputro Sussatrio, Hardito Syafrudin Syafrudin Syahidah, Aisyah Sabrina Nurul Syaiful . Syarief, Elijah Syifa, Viona Sylvia Rahmi Putri Tatang H. Soerawidjaja Taufiq, Akbar Teguh Purnomo, Teguh Tri Winarni Agustini Tri Winarni, Agustini Tutuk Djoko Kusworo Uray Irzandi Uray Irzandi Utama, Bobby Indra Vicky Ramadhani, Vicky widodo, anton sri Wilujeng, Dinanti Putrisia Winaningsih, Ima Wira Pinem Yanuar Rifianto YS Darmanto Yudhy Dharmawan Yuliani, Kristina Wulan Yulita Arni Priastiwi Yuliyandjaja, John Philia Yusi Luluk, Rahmania