International Journal of Engineering and Technology Innovation <p><strong><em>International Journal of Engineering and Technology Innovation</em></strong> (IJETI), ISSN 2223-5329 (Print), ISSN 2226-809X (Online), is an international, multidiscipline, open access, peer-reviewed scholarly journal, published quarterly for researchers, developers, technical managers, and educators in the field of engineering and technology innovation. The official abbreviated title is <strong><em>Int. j. eng. technol. innov</em>.</strong></p> <p>IJETI is indexed by:&nbsp;</p> <p><span style="color: black; font-family: 'Noto Sans'; font-size: 10.5pt;"><img style="width: 136px; height: 38px;" src="" alt="" width="171" height="38"> &nbsp;&nbsp; <span style="font-family: 'Noto Sans'; font-size: 10.5pt;"><img style="width: 244px; height: 58px;" src="/public/site/images/ijeti/ESCI3.png"> &nbsp;&nbsp; <img style="width: 136px; height: 38px;" src="/public/site/images/ijeti/EBSCO-1.png" width="170" height="35"> &nbsp; </span></span><span style="font-family: 'Noto Sans'; font-size: 10.5pt;"><img style="width: 136px; height: 38px;" src="/public/site/images/ijeti/image0031.jpg" width="116" height="38"> &nbsp; </span><img style="font-family: 'Noto Sans'; font-size: 10.5pt;" src="/public/site/images/ijeti/DOAJ4.png" alt=""></p> <p><img style="font-family: 'Noto Sans'; font-size: 10.5pt;" src="/public/site/images/ijeti/google5.png" alt=""> &nbsp; <img src="" alt=""> &nbsp; <img src="/public/site/images/allen/ProQuest-41.png"> &nbsp;&nbsp;<img src="/public/site/images/ijeti/Resarch_Bible5.png" alt="">&nbsp;&nbsp;<img src="/public/site/images/ijeti/WorldCat5.png" alt="" width="118" height="40">&nbsp;&nbsp;<img src="/public/site/images/allen/academia-12.png" width="136" height="27"> &nbsp;<img src="/public/site/images/ijeti/TOCs5.jpg" alt=""> &nbsp; <img src="/public/site/images/allen/Publons-22.5_1.png"> &nbsp; <img src="/public/site/images/allen/crossref3.png" width="92" height="42"></p> <p style="margin: 0cm 0cm 0pt;"><span style="color: black; font-family: 'Noto Sans'; font-size: 10.5pt;">Under evaluation of SCI, EI(Compendex), etc.</span></p> <p style="margin: 0cm 0cm 0pt;">&nbsp;</p> en-US <p style="line-height: 150%;"><strong><span style="font-family: Times New Roman; font-size: x-large;">Copyright Notice</span></strong></p> <hr> <p style="line-height: 150%;">&nbsp;</p> <p style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style='color: black; font-family: "Times New Roman","serif"; mso-bidi-font-size: 12.0pt;'><span style="font-size: medium;">Submission of a manuscript implies: that the work described has not been published before that it is not under consideration for publication elsewhere; that if and when the manuscript is accepted for publication. Authors can retain copyright in their articles with no restrictions. Also, author can post the final, peer-reviewed manuscript version (postprint) to any repository or website.</span></span></p> <p style="line-height: 150%;">&nbsp;</p> <p>&nbsp;</p> <p style="line-height: 150%;"><img alt="" src="/public/site/images/ijeti/cc.png"></p> <p style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style='color: black; font-family: "Times New Roman","serif"; mso-bidi-font-size: 12.0pt;'><span style="font-size: medium;">Since Jan. 01, 2019, IJETI will publish new articles with Creative Commons Attribution Non-Commercial License, under <a href="">Creative Commons <span class="cc-license-title">Attribution Non-Commercial 4.0 International</span> </a><span class="cc-license-identifier"><a href="">(CC BY-NC 4.0) License</a>.</span></span></span></p> <p style="line-height: 150%;"><span lang="EN-US" style='color: black; font-family: "Times New Roman","serif"; font-size: 12pt; mso-fareast-font-family: 新細明體; mso-fareast-theme-font: minor-fareast; mso-ansi-language: EN-US; mso-fareast-language: ZH-TW; mso-bidi-language: AR-SA;'>The Creative Commons Attribution Non-Commercial (CC-BY-NC) License permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.</span></p> (The editorial office) (Ms. Lin) Thu, 23 Dec 2021 08:42:19 +0000 OJS 60 Adaptive Vibrarthographic Signal Denoising via Ant Colony Optimization Using Dynamic Denoising Filter Parameters <p>This study proposes an ant colony optimization (ACO) denoising method with dynamic filter parameters. The proposed method is developed based on ensemble empirical mode decomposition (EEMD), and aims to improve the quality of vibrarthographic (VAG) signals. It mixes the original VAG signals with different white noise amplitudes, and adopts a hybrid technology that combines EEMD with a Savitzky-Golay (SG) filter containing the dynamic parameters optimized by ACO. The results show that the proposed method provides a higher peak signal-to-noise ratio (PSNR) and a smaller root-mean-square difference than the regular methods. The SNR improvement for the VAG signals of normal knees can reach 13 dB while maintaining the original signal structure, and the SNR improvement for the VAG signals of abnormal knees can reach 20 dB. The method proposed in this study can improve the quality of nonstationary VAG signals.</p> Rui Gong, Kazunori Hase, Hajime Ohtsu, Susumu Ota Copyright (c) 2021 Rui Gong, Kazunori Hase, Hajime Ohtsu, Susumu Ota Wed, 22 Dec 2021 00:00:00 +0000 Ultrasonic Measurement for the Experimental Investigation of Velocity Distribution in Vapor-Liquid Boiling Bubbly Flow <p>This study proposes an ultrasonic velocity profiler (UVP) with a single ultrasonic gas-liquid two-phase separation (SUTS) technique to measure the velocity distribution of vapor-liquid boiling bubbly flow. The proposed technique is capable of measuring the velocity of the vapor bubble and liquid separately in boiling conditions. To confirm the viability of the measurement technique, the experiment is conducted on vertical pipe flow apparatus. The ultrasonic transmission and effect of ultrasonic refraction through the pipe wall and water are investigated at ambient temperature until subcooled boiling temperature is reached. The velocity profile in the water at elevated temperature is measured to verify the ability of the technique in this application. The bubbly flow velocity distribution measurement in boiling conditions is then demonstrated. The results show that the proposed technique can effectively investigate the velocity of both phases under various fluid conditions in boiling bubbly flow.</p> Wongsakorn Wongsaroj, Hideharu Takahashi, Natee Thong-Un, Hiroshige Kikura Copyright (c) 2021 Wongsakorn Wongsaroj, Hideharu Takahashi, Natee Thong-Un , Hiroshige Kikura Tue, 07 Dec 2021 00:00:00 +0000 Finite Element Based Comparative Analysis of Positive Streamers in Multi Dispersed Nanoparticle Based Transformer Oil <p>The dispersion of dissimilar nanoparticles (NPs) in transformer oil (TO) has a major impact on fast propagating positive streamers. This work investigates the positive streamer dynamics in TO modified by dispersing both Fe<sub>3</sub>O<sub>4</sub> and Al<sub>2</sub>O<sub>3</sub> NPs at a homogenous concentration. The hydrodynamic drift diffusion model of positive streamer evolution and propagation are solved using the commercial software package COMSOL Multiphysics. The impact of multiple NPs (MNPs) has been analysed for streamer propagation, electric field intensity, electron density, and space charge density of modified TO. MNPs successfully reduce streamer propagation velocity by 50%, 17%, and 37.5% comparing to pure oil, Fe<sub>3</sub>O<sub>4</sub> based nanodielectric fluids (NDFs), and Al<sub>2</sub>O<sub>3</sub> based NDFs, respectively. The spatial distribution of electron density reveals the loss of electrons from the ionization region until the saturation of NPs. A comparative study demonstrates that MNPs significantly alter the streamer dynamics and augment the dielectric strength of TO compared to individual NPs.</p> Mihir Bhatt, Praghnesh Bhatt Copyright (c) 2021 Mihir Bhatt, Praghnesh Bhatt Mon, 09 Aug 2021 00:00:00 +0000 Development of Solar Desalination Units Using Solar Concentrators or/and Internal Reflectors <p>Solar distillation is one of the oldest and simplest technologies for desalination of salty water using renewable energy, namely solar energy, and the main problem of solar distillers is the low freshwater yield in contrast to the amount of energy input from the sun. To overcome the problem, this study develops three solar desalination units by using solar concentrators or/and internal reflectors, and compares the performance of three developed systems with the one of a conventional solar distiller under the climatic conditions of the Rabat region of Morocco. The three systems are: the solar distiller with a solar concentrator, the solar distiller with internal reflectors, and the solar distiller with a solar concentrator and internal reflectors. The energy balance equations of the systems are numerically resolved to utilize MATLAB software. The findings indicate that the utilization of the internal reflectors, the solar concentrator, and the solar concentrator and internal reflectors give better performance compared to the conventional solar distiller.</p> Mokhtar Mohammed, Taha Janan Mourad Copyright (c) 2021 Mokhtar Mohammed, Taha Janan Mourad Wed, 27 Oct 2021 00:00:00 +0000 Electronically Tunable TISO Voltage-Mode Universal Filter Using Two LT1228s <p>This study aims to design an electronically tunable voltage-mode (VM) universal filter utilizing commercially available LT1228 integrated circuits (ICs) with three-input and single-output (TISO) configuration. With the procedure based on two integrator loop filtering structures, the proposed filter consists of two LT1228s, four resistors, and two grounded capacitors. It realizes five filter output responses: low-pass, all-pass, band-reject, band-pass, and high-pass functions. By selecting input voltage signals, each output responses can be achieved without changing the circuit architecture. The natural angular frequency can be controlled electronically. The input voltage nodes <em>V<sub>in</sub></em><sub>1 </sub>and <em>V<sub>in</sub></em><sub>3</sub> possess high impedance. The output node has low impedance, so it can be cascaded to other circuits. The performance of the proposed filter is corroborated by PSpice simulation and hardware implementation which support the theoretical assumptions. The result shows that the range of total harmonic distortion (THD) is lower than 1%, and that the higher the temperature is, the lower the natural angular frequency is.</p> May Phu Pwint Wai, Winai jaikla, Surapong Siripongdee, Amornchai Chaichana, Peerawut Suwanjan Copyright (c) 2021 May Phu Pwint Wai, Winai jaikla, Surapong Siripongdee, Amornchai Chaichana, Peerawut Suwanjan Mon, 20 Dec 2021 00:00:00 +0000 Laboratory Model Tests on Stone Column and Pervious Concrete Columns: A Comparative Study <p>This study aims to perform laboratory model tests to investigate the load-deformation behavior of stone columns (SCs), pervious concrete columns (PCCs), and composite columns (CCs). Here, CC refers to the column which has the upper portion made of PCC and the lower portion made of SC. The parameters investigated in this study include column diameters, column lengths, and installation methods (pre-cast and cast-in-situ methods). The results of the model tests reveal that the axial load-carrying capacity of PCC is nearly 8 times more than that of SC with the same diameter. Moreover, it is also observed that at the top portion of SC, with the PCC length which is about 3.75 to 5 times the column diameter, the load-carrying capacity can significantly increase. It is concluded that the installation methods have marginal influence on the load-deformation behavior of PCC.</p> Jignesh Patel, Chandresh Solanki, Yogendra Tandel, Bhavin Patel Copyright (c) 2021 Jignesh Patel, Chandresh Solanki, Yogendra Tandel, Bhavin Patel Fri, 01 Oct 2021 00:00:00 +0000