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All Journal HAYATI Journal of Biosciences Reaktor International Journal of Science and Engineering (IJSE) METANA JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Bulletin of Chemical Reaction Engineering & Catalysis Majalah Ilmiah MOMENTUM Jurnal Manajemen Sumber Daya Perairan Indonesian Journal of Chemistry Jurnal Geofisika Jurnal Teknik Kimia Indonesia Journal of Renewable Energy, Electrical, and Computer Engineering Journal of Bioresources and Environmental Sciences Journal of Bioresources and Environmental Sciences International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
A Abdullah
Jurusan Teknik Kimia Fakultas Teknik Universitas Diponegoro Semarang
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Biodiesel Production from Nyamplung (Calophyllum inophyllum) Oil using Ionic Liquid as A Catalyst and Microwave Heating System Prima Astuti Handayani; Abdullah Abdullah; Hadiyanto Hadiyanto
Bulletin of Chemical Reaction Engineering & Catalysis 2017: BCREC Volume 12 Issue 2 Year 2017 (August 2017)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.12.2.807.293-298

Abstract

Nyamplung (Calophyllum inophyllum) is a typical Indonesian plant. Its seed contains abundant inedible oil, and therefore it is potential for biodiesel feedstock. The current issues of biodiesel are longer  reaction time of oil to biodiesel through transesterification reaction and lower biodiesel yield due to ineffective use of a homogenous catalyst. This work was aimed to use an ionic liquid as a catalyst and equipped with microwave heating as the heating system in order to increase the biodiesel yield and accelerate the process. Effects of the catalyst concentration and power of microwave irradiation to the biodiesel yield were studied. The ionic liquid of 1-butyl-3-methylimidazolium hydrogen sulfate (BMIMHSO4) was used as a catalyst. The results showed that the highest biodiesel yield was achieved of 92.81% which was catalyzed by IL0.5NaOH0.5 (0.5 wt.% (BMIMHSO4) + 0.5 wt.% NaOH) with a methanol-to-oil molar ratio of 9, a reaction time of 6 minutes, and the microwave temperature was 60 °C. 
Inhibition Effect of Ca2+ Ions on Sucrose Hydrolysis Using Invertase Hargono Hargono; Bakti Jos; Abdullah Abdullah; Teguh Riyanto
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.3.4437.646-653

Abstract

Fermentable sugar for bioethanol production can be produced from molasses due to its high sucrose content but Ca2+ ions found in the molasses may affect the hydrolysis. Therefore, this paper was focused to study the effect of Ca2+ ions as CaO on sucrose hydrolysis using invertase and to obtain the kinetic parameters. The kinetic parameters (KM and Vmax) were obtained using a Lineweaver-Burk plot. The value of KM and Vmax parameters were 36.181 g/L and 21.322 g/L.h, respectively. The Ca2+ ions act as competitive inhibitor in sucrose hydrolysis using invertase. Therefore, the inhibition mechanism was followed the competitive inhibition mechanism. The value of inhibition constant was 0.833 g/g. These parameters were obtained from the non-substrate inhibition process because this study used the low substrate concentrations which means the fermentable sugar production was low. Hence, there were still more challenges to studying the simultaneous effect of substrate and Ca2+ on sucrose hydrolysis to produce high fermentable sugar. 
Unveiling the Nexus: Analyzing foreign direct investment and energy consumption in shaping carbon footprints across Africa’s leading CO2-emitting countries Njie, Yahya; Wang, Weidong; Liu, Lin; Abdullah, .
International Journal of Renewable Energy Development Vol 13, No 5 (2024): September 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60315

Abstract

Carbon emissions have become a pressing global concern because of its contribution to climate change and environmental degradation. Given the urgency to tackle climate change, especially by reducing carbon emissions, this study focuses on Africa’s leading CO2 emitters from 2000 to 2020. The aims of the study are; to examine whether there is evidence of an energy-Kuznets Curve among the leading CO2 emitters in Africa, to examine whether there is evidence of an FDI-Kuznets Curve among the leading CO2 emitters in Africa, and to Identify the turning points. The study employs an innovative analysis of unbalanced panel data utilizing sophisticated econometric techniques, the contemporaneous correlation methodology, which are; the feasible generalized least squares (FGLS), and the panel-corrected standard errors (PCSE) to uncover insights. The results reveal consistency across all employed techniques. The study confirms the existence of an Energy-Kuznets Curve among the leading CO2 emitters in Africa; it also finds evidence of a U-shaped relationship between foreign direct investment and carbon emissions among the leading CO2 emitters in Africa; finally, it also identifies crucial turning points at 2760.12kg and 2886.29kg of oil equivalent per capita for energy use and 6.89% and 6.17% for FDI inflow, respectively. By investigating the factors influencing carbon emissions and evaluating their impacts, our study offers valuable insights for policymakers. These findings can inform the development of targeted interventions to curb emissions intensity, enhance energy efficiency, and foster the adoption of renewable energy sources.
Hasil Awal Analisis Peak Ground Acceleration di Bali Gandini, D. R. A; Setiawan, Y A; Madrinovella, I; Abdullah, A; Pranata, B; Suhardja, S K; Aisy, S R
Jurnal Geofisika Vol 20 No 2 (2022): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v20i2.535

Abstract

Wilayah Bali merupakan daerah dengan tingkat seismisitas yang tinggi karena terletak di Zona Subduksi antara Lempeng Indo-Australia dan Eurasia (selatan) serta adanya struktur back arc thrust (utara). Gempa Bumi Seririt yang terjadi pada tanggal 14 Juli 1976 dengan magnitudo 6,2 SR merupakan salah satu gempa paling merusak di Bali. Oleh karena itu perlu dilakukan upaya mitigasi untuk melihat tingkat potensi bahaya bencana gempa bumi di wilayah Bali. Peak Ground Acceleration (PGA) merupakan pendekatan yang dapat dilakukan dengan cara menentukan intensitas seismik dari gempa bumi di suatu wilayah sehingga dapat diperkirakan risiko paling parah yang dapat dihasilkan dari suatu kejadian gempa bumi. Perhitungan nilai PGA dapat dilakukan melalui suatu pendekatan rumus empiris atenuasi khusus wilayah tertentu. Data yang digunakan berasal dari katalog gempa bumi ISC (1970-2019), USGS (1963-2019), dan data rekaman accelerograph BMKG (2012-2016) di wilayah Bali. Rumus empiris atenuasi dipilih dengan mempertimbangkan jenis gempa bumi dominan dan kondisi geologi di wilayah Bali. Terdapat 3 rumus empiris atenuasi yang digunakan yaitu oleh McGuire (1977), Donovan (1973), dan Esteva & Villaverde (1973). Rumus empiris atenuasi oleh McGuire (1977) menghasilkan nilai error terkecil berdasarkan perbandingan nilai PGA observasi dan nilai PGA kalkulasi. Analisa tingkat potensi risiko akibat gempa bumi dapat dilakukan berdasarkan peta percepatan tanah maksimum dan peta intensitas seismik maksimum di Wilayah Bali. Kabupaten Buleleng dan sekitarnya serta daerah paling timur dari Kabupaten Karangasem merupakan wilayah yang berpotensi terkena dampak paling parah jika terjadi gempa bumi bersifat merusak, sedangkan daerah paling selatan dari Pulau Bali memiliki dampak yang relatif ringan jika terjadi gempa bumi yang bersifat merusak.
Design and Build Solar Panels as Source Rice Thresher Motor Energy Sitepu, Trahman; Malau, Ayu Tamara; Cholish, C; Abdullah, A
Journal of Renewable Energy, Electrical, and Computer Engineering Vol. 1 No. 2 (2021): September 2021
Publisher : Institute for Research and Community Service (LPPM), Universitas Malikussaleh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jreece.v1i2.5233

Abstract

Renewable energy generated from sunlight (Solar Panels) can be formed as alternative energy that can be applied to a source of electrical energy in rice thresher equipment. The use of solar energy with a power of 240 WP through the object on the rice thresher is able to replace the rice thresher automatically which is more effective. The power generated by solar energy will be processed into a charging source for the Regulated Battery Charger which can be supplied at a voltage to the control circuit to drive the DC motor. The average voltage generated by solar energy is 0.000394 volts/lux with a maximum voltage of 36.2 volts and a DC motor of 350 watts. In addition, the speed of this rice thresher is 950.8 rpm and is able to produce very good rice cutting against the designed solar energy capabilities.
Co-Authors . Bahtiar . Widayat Ahmad Fauzi Ismail Ahmad Mustafa Aisy, S R Al Hadatz, Jubair Alice Pramashinta Andi Irwan Nur, Andi Irwan Ardina, Wa Ode Argadenta Adi Prabawa Bakti Jos Bayu Wicaksono Broto Dhegdo Haris Pranoto Cholish D. Soetrisnanto Danang Kristiyanto Dian Arofisma Dyah Hesti Wardhani Elisa Mutiah Elisa Mutiah Emil Hanityo Utomo Erlinda Khoirunisa Erlinda Khoirunisa F Armanda, F Fahmi Arifan Fenti, La Ode Gandini, D. R. A H Hadiyanto H Hamid H. Satriadi Hamid Hamid Hanafi Mat Hanapi bin Mat Hanapi bin Mat Hantoro Satriado Hargono Hargono Ibrahim Ghazi Ika Windrianto K. Handono Iswandi, . Kasim, Ma'ruf La Anadi, La Lin Liu Lucia Hermawati Rahayu M. Hadi M. Hadi Maani, Gratischa VHL Madrinovella, I Maharani Kusumaningrum Malau, Ayu Tamara Marcelinus Christwardana Marlia, . Nadia, La Ode Abdul Rajab Njie, Yahya Pranata, B Prima Astuti Handayani Salsabila, Unik Hanifah Samida, . Sasmito, Hardianto Setiawan, Y A Siswo Sumardiono Sitepu, Trahman Suhardja, S K Teguh Riyanto Tutuk Djoko Kusworo Weidong Wang