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( Abdullah ),( Pooja P. Kanade ),( Nomin-erdene Oyunbaatar ),( Yun-jin Jeong ),( Dong-su Kim ),( Dong-weon Lee ) 한국센서학회 2022 센서학회지 Vol.31 No.1
To date, various techniques have been utilized to assess the contractility of cardiomyocytes and their response to drug-induced toxicity. However, these techniques are either invasive or involve complex fabrication methods and expertise. Here, we introduce the use of video-based analysis software to track the motion of cardiomyocytes and assess their contractility. The software, called “Tracker”, is freely available and this is the first attempt at using it for cardiac contractility measurement. We used the software to measure the contractile properties of cells cultured on a rigid substrate and two flexible polydimethylsiloxane (PDMS) substrates having different elastic moduli day-wise up to eight days. Contractility was found to be highest in the most flexible substrate. Subsequently, the cardiotoxicity response of the cells on three different substrates was analyzed with verapamil. It was observed that the cells on rigid substrate were primarily affected by drug-induced toxicity, while the drug had a lesser impact on cells on the more flexible PDMS substrate. Evidently, the flexible substrate aided the maturation of cells and had lower drug toxicity, while the cells on PS could not fully mature. The assessment of cardiomyocytes using “Tracker” proved to be simple and reliable.
A review on thermochemical seasonal solar energy storage materials and modeling methods
ABDULLAH,Koushaeian M.,Shah N. A.,정재동 대한설비공학회 2024 International Journal of Air-Conditioning and Refr Vol.32 No.1
In the current era, national and international energy strategies are increasingly focused on promoting the adoption of clean and sustainable energy sources. In this perspective, thermal energy storage (TES) is essential in developing sustainable energy systems. Researchers examined thermochemical heat storage because of its benefits over sensible and latent heat storage systems, such as higher energy density and decreased heat loss. Solar energy is a promising alternative among the numerous renewable energy sources. As a result, this study provides an overview of thermochemical heat storage materials, focusing on materials utilized by solar energy systems in buildings. The research examines the storage materials used in relevant studies and the models used to predict and enhance system performance.
Abdullah,M. Shaheer Akhtar,Eun-Bi Kim,Lamiaa Fijahi,Hyung-Shik Shin,Sadia Ameen 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Benzoselenadiazole as the central acceptor unit with terminal donor unit of n-hexylbithiophene waschosen to design the symmetric donor-acceptor-donor (D–A–D) configuration based small organicchromophore, 4,7-bis(50-hexyl-[2,20-bithiophen]-5-yl)benzo[c][1,2,5]selenadiazole, RTh-BSe-ThR, forthe fabrication of solution-processed bulk-heterojunction organic solar cells (BHJ-OSCs). RTh-BSe-ThRchromophore showed assuring solubility in common organic solvents and exhibited wider absorption inthe visible region with an optical band gap (Egopt) of1.87 eV. Benzoselenadiazole unit with two nhexylbithiopheneunits exhibited an excellent electrochemical behavior with the highest occupiedmolecular orbital (HOMO) of5.38 eV and the lowest unoccupied molecular orbital (LUMO) of3.51 eV. The fabricated BHJ-OSCs with RTh-BSe-ThR:PC61BM (1:3, w/w) blend thinfilm displayed a powerconversion efficiency (PCE) of3.46% and a high value of short circuit current density (JSC) of11.20 mA/cm2. The enhancement in the photovoltaic parameters might be attributed to the significantimprovements in the interfacial area of bulk heterojunction which might enhance the light harvestingproperty and the shunt resistance of the blend thinfilms.
Complete collapse test of reinforced concrete columns
Abdullah, Abdullah,Takiguchi, Katsuki Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.12 No.2
In this paper, experimental investigation into the behavior of reinforced concrete (RC) columns tested under large lateral displacement with four different types of loading arrangements is presented. Each loading arrangement has a different system for controlling the consistency of the loading condition. One of the loading arrangements used three units of link mechanism to control the parallelism of the top and bottom stub of column during testing, and the remaining employed eight hydraulic jacks for the same purpose. The loading systems condition used in this investigation were similar to the actual case in a moment-resisting frame where the tested column was displaced in a double curvature. Ten model column specimens, divided into four series were prepared. Two columns were tested monotonically until collapse, and unless failure took place at an earlier stage of loading, the remaining eight columns were tested under cyclic loading. Test results indicated that the proposed system to keep the top and bottom stubs parallel during testing performed well.