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Artoto Arkundato
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Jurusan Fisika, FMIPA, Universitas Jember Jalan Kalimantan No.37, Krajan Timur, Jember Lor, Kecamatan Sumbersari, Kabupaten Jember, Jawa Timur 68121
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Computational and Experimental Research in Materials and Renewable Energy (CERiMRE)
Published by Universitas Jember
ISSN : -     EISSN : 2747173X     DOI : https://doi.org/10.19184/cerimre.v3i2.23544
Core Subject : Science,
Computer Science & IT Energy Materials Science & Nanotechnology Physics
Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) journal receives scientific articles of experimental and/or computational research that using many tools and methods as computational methods (Micromagnetic simulation, DFT Density Functional Theory, MD molecular dynamics, CFD computational fluid dynamics, MC Monte Carlo, FEM finite element method, transport neutron equation, etc) and standard experimental tools and analysis (FTIR, XRD, EDAX, bending test, etc) to develop potential applications of new materials and renewable energy sources. The materials and renewable energy under investigation may show: Prediction of material properties for new potential applications as electronics materials, photonics materials, magnetic materials, spintronics materials, optoelectronics materials, nuclear materials, thermoelectric materials, etc. Exploration of new design of renewable energy resources as in nuclear power plants, solar cell, fuel cells, biomass, thermoelectric generators, nuclear batteries, wind, wave, geothermal, etc.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 74 Documents
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Evaluation of Bunsen Reaction Kinetics in Iodine-sulfur Thermochemical Process for Hydrogen Production Vakil, Nafees Ahmed; Rao, Shriniwas A
Computational And Experimental Research In Materials And Renewable Energy Vol 7 No 2 (2024): November
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v7i2.53218

Abstract

There are many thermochemical processes; one of the potential processes is iodine-sulfur (IS) thermochemical process which involves three reaction steps. Bunsen reaction is the first reaction. Kinetic rate data of Bunsen reaction is essential for design and scale up of I-S process. Experiments have been carried out in stirred glass reactor to determine kinetic rate data for Bunsen reaction. The aim of the work is to evaluate intrinsic kinetic rate constant of Bunsen reaction. Mass transfer coefficient is evaluated experimentally for water-sulfur dioxide system. Stirring speed is varied up to 360rpm to obtain a regime in which mass transfer is independent of absorption rate. Mass transfer coefficients are evaluated in the range of 8.7×10-6 m/s to 1.5×10-5 m/s at different stirring speeds. Mass transfer coefficients obtained experimentally. These coefficients are compared with published literature and found to be in good agreement. Bunsen reaction has been carried out in a stirred glass reactor and obtained reaction kinetic rate constant as 1.8 Second-1. Hatta number and Infinite enhancement factors are calculated from the experimentally obtained kinetic rate constant and mass transfer coefficient and found to be 3.6 and 18 respectively. From the calculated values of Hatta number and Infinite enhancement factors, the regime of chemical reaction is found to be in the fast pseudo first order reaction regime.Keywords: Hydrogen production, iodine-sulfur process, Bunsen reaction, stirred glass reactor, reaction kinetics
Applications of Green Inhibitors of Sugarcane Bagasse and Garcinia Kola Fruit Pod for Mild Steel Natural Gas Pipeline Corrosion Inhibition in Acidic Medium Jemine, Teddy E.; Igbafe, Sylvia; Adeniyi, Adekunle Timisiriyu; IGBAFE, Anselm Iuebego
Computational And Experimental Research In Materials And Renewable Energy Vol 7 No 2 (2024): November
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v7i2.50834

Abstract

This study examined the effectiveness of sugarcane bagasse (SCB) and garcinia kola fruit pod (GKFP) extracts as green corrosion inhibitors on mild steel. Extracts of SCB and GKFP were obtained using ethanol in a solvent extraction and characterized physiochemically and phytochemically. Using central composite design (CCD) approach in design expert version 12, process variables of extract concentrations of 0.025 - 0.075 g per liter, exposure durations of 4 - 6 days and temperatures of 50 - 80 °C were varied for the evaluation of the gravimetric corrosion tests. Phytochemical analyses revealed the presence of alkaloids, flavonoids, glycosides, saponin, steroids, phenols, terpenoids, tannin and anthraquinones. FTIR analyses of the SCB and GKFP extracts indicated functional groups of phenols, hydroxyl, alcohols, carbonyl, esters, alkyl halides, aldehydes and alkenes. The best of the observed CCD findings on inhibition efficiencies were 92.11 and 90.20 % on SCB and GKFP extracts respectively with process conditions of inhibitor concentrations of 0.025 and 0.075 g/L of SCB and GKFP extracts respectively for temperature of 50 °C and exposure time 5 days. However, on overall analyses based on varying inhibitor concentrations, temperature range and duration of exposure, the optimal inhibition performance was 62.04 % with SCB and 64.35 % with GKFP. The most effective inhibitor is GKFP which yielded a higher inhibition efficiency under same operating conditions. bioactive compound acts as antioxidants in providing a reducing environment of the acidic reaction by which hydrogen ion in donated in the cause of the reaction. The investigation between the absence and presence of phytochemicals coupled with the components in both extracts from FTIR analyses revealed the significant participation of the bioactive agents of on the mild steel corrosion inhibition in acidic medium.Keywords: Sugarcane bagasse, Garcinia kola fruit pod, corrosion inhibitors, acidic medium mild steel
Design and COMSOL Simulation of Different Shaped Piezoelectric Vibration Energy Harvesters: A Study on MEMS Vibrational Energy Harvesters Khan, Aimal; Nawaz, Muhammad Qasim; Lu, Xu
Computational And Experimental Research In Materials And Renewable Energy Vol 7 No 2 (2024): November
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v7i2.51895

Abstract

Vibrational energy harvesters, also referred to as MEMS (Micro-Electro-Mechanical Systems) piezoelectric energy harvesters, have garnered significant attention for their potential to power wireless sensor networks and low-power electronics without external power sources. Piezoelectric materials, due to their high energy conversion efficiency and seamless integration into microsystems, are widely utilized in such designs. In this study, we simulate MEMS piezoelectric energy harvesters using PZT (lead zirconate titanate) material, each constructed with a silicon core layer and PZT piezoelectric layers. The simulations, conducted using COMSOL Multiphysics, analyze the performance of cantilever-shaped harvesters under identical boundary conditions, including solid mechanics, electrostatics, and an electric circuit with a 10 kΩ resistive load. The results show that natural frequencies range from 100 Hz to 500 Hz depending on the cantilever shape, with the generated voltage varying between 1.2 V and 3.5 V and corresponding power outputs ranging from 0.2 μW to 1.5 μW. These variations highlight the influence of cantilever geometry on energy harvesting efficiency. The study also identifies specific advantages, such as higher power density and tunable frequency ranges, making these harvesters suitable for powering remote sensing devices and microscale electronics. By quantifying performance metrics and demonstrating shape-dependent benefits, this research provides valuable insights into the design and optimization of MEMS piezoelectric harvesters for diverse applications.Keywords: Piezoelectric vibration energy harvesters, COMSOL simulation, MEMS vibrational energy harvesters, bimorph design.
Thermal Performance of Public Green Space using Palm Fiber Net-Based Green Canopy and Passion Fruit (Passiflora Edulis) Vegetation Muksin, Engelina; Jahja, Mohamad; Setiawan, Dewa Gede Eka; Ramadani, A Indra Wulan Sari; Djafar, Abdi Gunawan; Latief, Muh. Fachrul
Computational And Experimental Research In Materials And Renewable Energy Vol. 8 No. 1 (2025): May
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v8i1.53398

Abstract

This study aims to evaluate the thermal performance of green canopies in public green spaces (RTH), both outdoors and indoors, as an environmentally friendly solution. The method involved measuring temperature and humidity over a five-month period with four observation intervals. The data were analyzed using the Temperature-Humidity Index (THI) and compared with thermal comfort standards based on the Indonesian National Standard (SNI). The results show that at 0% plant coverage, the THI values fall into the "comfortable to slightly uncomfortable" category during the period from 19:00 to 08:00. In contrast, at 81.25% plant coverage, THI values remain in the "comfortable to slightly uncomfortable" range from 21:00 to 09:00. Relative humidity met the SNI standard of 75%. Furthermore, the outdoor temperature decreased by 4.9 °C, while the indoor temperature decreased by 3.5 °C. These findings indicate that the presence of green canopies, particularly in private green spaces, significantly reduces both outdoor and indoor temperatures as the percentage of plant coverage increases.Keywords: Public Green Space, Green Canopy, Temperature Humidity Index, Indonesian National Standards

Page 8 of 8 | Total Record : 74

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