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Recent Submissions
Photovoltaic efficacy of WS2 as back surface field (BSF) and SWCNT as an absorber layer for heterostructure solar cell: Numerical investigation by SCAPS-1D multidimensional framework
(Center for Research and Publication (CRP), 2024-12) Uddin, Muhammad Athar
This study presents a highly efficient heterostructure solar cell model using single-walled carbon nanotubes (SWCNTs) as the absorber layer, tungsten di-sulfide (WS2) as BSF layer and platinum (Pt) as the back contact. Using the SCAPS-1D software, the research focuses on optimizing critical design parameters such as the thickness (W) and acceptor concentration (NA) of the absorber layer, along with the impact of as the BSF series-shunt resistance, temperature and defect densities across different layers. The model, ITO/CdS/SWCNT/WS2 configurations, aims to achieve superior PV performances. Key innovations include the incorporation of minority carriers to simulate defects and interfaces defect coefficients depicted through contour plots. The optimized parameters for the ITO/CdS/SWCNT/WS2 model are established at a thickness of 1.5 μm, an acceptor concentration of 4×1019cm−3 and a defect density of 1×1016cm−3, resulting in an efficiency of 30.01% with VOC = 0.86V, JSC = 41.42mA/cm2 and FF = 83.84% achieved at 300oK temperature. These discoveries underscore the considerable promise of SWCNTs functioning as the absorber layer in a heterostructure solar cell, offering promising outcomes for environmental sustainability and global energy solutions
In vitro antimicrobial, cytotoxicity, antioxidant and In vivo analgesic activities of methanol extract of Dipterocarpus turbinatus leaves
(Center for Research and Publication (CRP), 2024-12) Abu Sayeed, Mohammad; Ahmad, Muzammil; Kader, Shalah Uddin; Hasan, Mehedi
The study aimed to investigate the antimicrobial, cytotoxic, antioxidant, and analgesic properties of a methanol extract of Dipterocarpus turbinatus leaves. The extract shows a moderate antimicrobial effect against the tested organisms at different concentrations (10-19 mm of zone of inhibition). The percentage of mortality was observed to increase as the dose increased. The LC50 was found to be 408.50 μg/mL which proved the plant to be a good source of novel drugs with less toxicity. It exhibits antioxidant effect revealed by increase in the percentage of scavenging assay observed with increase in concentration. The presence of reductants in MEDT was also revealed. The number of writhing which is a dose dependent shows highest number at a dose of 200 mg/kg body weight i.e., 32.83±1.25 and 28.16±1.89, 15.5±2 for 400 mg/kg of MEDT and 10 mg/kg of Diclofenac-Na respectively. At a dose 0f 200 mg/kg of MEDT, 28.51±0.560 seconds were spent licking the paw while at a dose of 400 mg/kg of MEDT, 23.60±0.545 seconds were spent licking the paw.
In vitro quality assessment of ketotifen fumarate tablets commercially available in Bangladesh
(Center for Research and Publication (CRP), 2024-12) Sayeed, Mohammed Abu
Quality defines the standard of a product and every company strives to achieve it, although it is often challenging. Quality of pharmaceutical products is very important for achieving the therapeutically activity of the standard drugs. This research work was aimed to investigate the quality control parameters of five brands of ketotifen that are available in the market. The five ketotifen brands were collected from the Bangladeshi local market, after which they underwent various physical parameter assessments including weight variation, hardness, friability, potency, disintegration, and acid-base degradation assessments. The brands passed the tests as no tablets crossed the ±10 % weight variation. The percentage friability of the five brands was less than 1%, hence they satisfied the standards. The disintegration time of the tablets did not exceed 5 minutes; therefore, they met the standards. All the brands showed potency ranging from 90 to 110%. In the degradation studies, no products met the USP specified limit. The average hardness of all brands did not meet the standard criterion.
Modified electrophoretic deposition approach for dye-sensitized solar cell application
(Center for Research and Publication (CRP), 2024-12) Choudhury, Md. Shamimul Haque
In this investigation, we are reporting a new electrophoretic deposition approach to prepare a homogeneous, uniform, and crack-free TiO2 photoelectrode for DSSC application. A four-layer deposition technique along with the optimization of the EPD parameters has been applied in this work. To ensure the uniformity of the photoelectrode film, the substrate has been rotated by an angle of 90 degrees before each deposition. The uniformity of the layer is observed by measuring the thickness of the film from each side. The result shows that the proposed technique maintains more uniformity compared to the single-layer deposition and conventional multilayer deposition techniques. It gives relatively a compact layer photoelectrode surface having less amount of crack. The Scanning Electron Microscopy (SEM) image of the photoelectrode surface and photovoltaic performance of the cells confirms that our proposed EPD approach gives a uniform, homogeneous, and compact layer photoelectrode surface with better photovoltaic performance compared to the cells prepared by a conventional single layer or multilayer deposition technique.
Kattosh (Lasia spinosa (L.) Thwaites) an edible vegetable improve anxiety and depression in animal model
(Center for Research and Publication (CRP), 2024-12) Reza, Ali
Lasia spinosa (L.) thw is utilized in folk medication against different ailments such as diabetic, anxiety and depression. The aim of the present study was to investigate the anxiolytic and antidepression activities of hydroalcoholic extract of Lasia spinosa (HaE-LS) in mice model. This research investigated the effects of hydroalcoholic extract (HaE-LS) L. spinosa in recovery of behavioral changes through its, anxiolytic and anti-depressant impacts. The anxiolytic activity was assessed by elevated plus maze (EPM) test and hole board tests (HBT), anti-depressant effect was appraised by tail suspension tests (TST) and forced swimming test (FST). During the anxiolytic assay by elevated plus maze test, the HaE-LS significantly (p< 0.05) increased the time spent in the open arm 71.67 ± 4.70 sec at the dosages of 400 mg/kg. In HBT HaE-LS exhibited dose-dependent anxiolytic activity. In TST, mice swallowed with 400 mg/kg of HaE-LS demonstrated significant (p< 0.005) immobile time 60.33 ± 2.37 sec.In FST, the HaE-LS displayed reductions in their immobility times, which was significant 75.67 ± 2.33 sec and 61.67 ± 2.33 sec at the dosage of 200 and 400 mg/kg, respectively. Overall, the results recommend that HaE-LS could be a promising beneficial option for the treatment of anxiety and depression disorders