Thermodynamic Evaluation of Isothermal Adsorption Refrigeration Cycle

Abdullah,Jae Dong Chung 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.4

A symmetric benzoselenadiazole based D–A–D small molecule for solution processed bulk-heterojunction organic solar cells

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.

Evaluation of Different MOFs for Short-term Adsorption-based Energy Storage (ATES)

Abdullah,Mahdi Koushaeian,Duong Xuan Quang,Jae-Dong Chung 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.11

thermal energy storage could the future technology to save electricity consumption in residential buildings. This study proposed to evaluate a typical closed cycle adsorption thermal energy storage system (ATES). Adsorbent material selection is crucial consideration for any ATES system. Different MOFs energy densities were calculated using validated code in MATLAB. The conventional adsorbent like silica gel has lower performance than MOFs. (CH₃)₂MOF-801show highest store energy density as compared to other selected MOFs. Furthermore, maximum useful stored energy can be extracted from this MOF. Hence using MOFs is viable option for thermal energy storage applications.

Preliminary study of different MOFs for energy storage application

Abdullah,Jhon Hung Pak,Jae Dong Chung 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6

A preliminary study was conducted for selecting suitable material for energy storage application, which can utilize low grade waste heat and exhibit high energy density. Secondly, two bed system was validate and developed in MATLAB. The developed model can be used effectively for different materials analysis. Among other materials MOFs have favorable properties which can be used as energy storage material in sorption system. MOF’s operate on low grade waste heat (80oC-100oC) and exhibits high energy density.

Classification of Algae Plant Using Deep Learning

Abdullah,Ali Sikandar,Ali Hussain,Ali Athar,M. Mohsin,Hee-Cheol Kim 한국정보통신학회 2022 2016 INTERNATIONAL CONFERENCE Vol.13 No.1

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.

Analysis of the Growth Characteristics of Cardiac Cells According to Mechanical Properties of Substrates Using the Simplified Measurement Technique of Tracker

( 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.

Growth Performance, Carcass and Meat Characteristics of Black Goat Kids Fed Sesame Hulls and Prosopis juliflora Pods

Abdullah, Abdullah Y.,Obeidat, Belal S.,Muwalla, Marwan M.,Matarneh, Sulaiman K.,Ishmais, Majdi A. Abu Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.9

Finding alternative feeds, such as sesame hulls and Prosopis juliflora species can attenuate difficulties of feed shortage and reduce the cost of animal feed in arid and semi-arid countries. Thirty-two Black male kids with similar initial weights (BW = $16.7{\pm}0.80\;kg$) and $120{\pm}5\;d$ of age, were used to evaluate the effect of replacing barley grains and soybean meal with Prosopis juliflora pods (PJP) and sesame hulls (SH) on growth performance, digestibility and carcass and meat characteristics. Kids were equally divided into four dietary treatment groups for an 84-d fattening period. Treatment diets had similar crude protein (CP) and metabolizable energy (ME). The treatment groups were: (T1) no PJP nor SH, (T2) 10% PJP and 20% SH, (T3) 15% PJP and 15% SH, and (T4) 20% PJP and 10% SH. A tendency was detected (p<0.08) for dry matter (DM), crude protein (CP), organic matter (OM) and neutral detergent fiber (NDF) intakes that were greater for T2 than T3 and T4 while T1 was not different from all other treatment groups. Ether extract (EE) intake was the greatest (p<0.05) for T2 and the lowest for T1. Acid detergent fiber (ADF) intake was greater (p<0.05) for T2 than T1 while T3 and T4 were intermediate. Final live weight, average daily gain (ADG) and feed conversion ratio (FCR) were comparable among different treatment groups. Digestibility of DM, OM, CP, NDF and ADF were similar among all treatment groups, however, EE digestibility was the lowest (p<0.05) for T1 when compared to other treatments. In addition, nitrogen intake, nitrogen in urine and retained and retention percentages were similar among all treatment groups. However, N loss in feces was higher (p<0.05) for T2 than T3 and T4 while T1 was intermediate. No differences were observed among treatment groups with respect to fasting live weight, hot and cold carcass weights, dressing-out percentages, mesenteric fat, visceral organs, carcass cuts percentages and carcass linear dimensions. No differences were also observed for dissected loin, leg, rack and shoulder tissues except in the total bone % for loin cuts and in the meat to bone ratio for rack cuts. T3 has the greatest total bone % and the lowest meat to bone ratio when compared to all other treatment groups. No differences were observed between treatment groups in all quality characteristics of the longissimus muscle. The present study demonstrates the potential of using PJP and SH for growing kids without adverse effects on growth performance, carcass characteristics and meat quality.

Effects of Strain on Performance, and Age at Slaughter and Duration of Post-chilling Aging on Meat Quality Traits of Broiler

Abdullah, Abdullah Y.,Muwalla, Marwan M.,Maharmeh, Haitham O.,Matarneh, Sulaiman K.,Ishmais, Majdi A. Abu Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.12

This study was conducted to investigate the effects of strain on broiler performance, and age at slaughter and postchilling (PC) aging time on meat quality traits. A total of 500 one-day-old chicks (250 Hubbard classic and 250 Lohman) were reared under commercial conditions. Half of the broiler birds from each strain were slaughtered at 32 days and the other half at 42 days old. At each processing day, 168 carcasses were randomly selected (84 Hubbard and 84 Lohman) and divided into groups of 28 carcasses within each strain, and aged for 0, 4 and 24 h after chilling. Average weekly body weight was comparable between strains. Feed conversion ratio was higher (p<0.05) for the Hubbard strain during the second and third week of age. Initial carcass pH was significantly (p<0.05) affected by age where younger birds (32-d-old) had lower pH values than older (41-d-old) birds. Breast temperature was higher (p<0.001) for Lohman than Hubbard at 0, 2 and 4 h of PC. Younger birds had a lower breast temperature (p<0.001) at all measured times of PC. Thaw loss, cook loss and water holding capacity were not significantly affected by strain, age or aging time. Lohman strain had more tender meat (p<0.05) than Hubbard strain, and tenderness was improved with the increase of broiler age and aging time. Meats from Hubbard were lighter and less red than those from Lohman strain where younger birds had darker color. In conclusion, strain, age at slaughter and PC aging duration are critical to breast meat quality characteristics, and 4 h of aging are required before deboning in order to obtain more tender fillets.

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.