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MUHAMMAD SALEEM,M. ASHFAQ AHMAD,RIZWAN RAZA,S. J. XUE,L. FANG,F. WU,W. J. LI,C. L. XU,L. HU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Zinc oxide (ZnO) nanowire (NW) ¯lms were synthesized at low temperature (95?C) throughamine-assisted solution process and used as photoanode for the fabrication of dye-sensitized solarcells (DSSCs). It was found that with the addition of polyethyleneimine (PEI) and ammoniumhydroxide (NH 4 OH) in growth solution, the NWs were smaller in diameter and longer in lengthby prolonging the growth time without refreshing the growth solution. A reasonable overallconversion e±ciency of 1.25% was achieved with photoanode based on ZnO NWs containing PEIand NH 4 OH. However, DSSC fabricated with ZnO NWs not containing PEI and NH 4 OH showedlow conversion e±ciency of 0.58%. All the DSSCs exhibited almost similar values of open circuitvoltage ( V OC) and ¯ll factor (FF). Interestingly, DSSC based on ZnO NWs with PEI and NH 4 OHobtained two times higher short circuit current density ( J SC) compared to ZnO NWs photoanodewithout PEI and NH 4 OH. The increase in e±ciency and J SC with the length of NWs is attributedto the increase in internal surface area for su±cient dye loading and light harvesting.
Waqas WAKIL,Muhammad ASHFAQ,권용정,M. U. GHAZANFAR 한국곤충학회 2009 Entomological Research Vol.39 No.1
A study was carried out at the University of Arid Agriculture, Rawalpindi, Pakistan to integrate different control measures against Helicoverpa armigera (Hübner) on chickpea, to minimize the use of hazardous insecticides and develop an eco-friendly management program. Cultural (weeding), mechanical (hand picking), biological (release of Trichogramma chilonis), microbial (spraying of Bacillus thruingiensis) and chemical (Steward) control practices were applied three times at 10 day intervals individually and also in various combinations. The application of Steward proved most effective when applied alone, with 0.41 larvae/plant, pod infestation of 9.31% and the highest grain yield (1203.66 g/plot); however, the integration of weeding, hand picking and Steward proved to be the most effective in reducing the larval population (0.12 larvae/plant) with minimum pod infestation (5.45%) on variety CM-2000, which resulted in the maximum grain yield (1260.33 g/plot). The cost–enefit ratio in the treatment where Steward was applied alone was 1:2.20, and it was 1:3.53 where weeding and hand picking practices were integrated.
Monirul Islam Miskat,Ashfaq Ahmed,Md Salman Rahman,Hemal Chowdhury,Tamal Chowdhury,Piyal Chowdhury,Sadiq M. Sait,Young-Kwon Park 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Current environmental catastrophes generating from fossil fuel power generation has attracted the attention of energy planners to look for sustainable energy sources. Hydropower is one of the oldest energy sources that have been utilized all over the world to generate electricity, especially in remote areas. Being one of the most densely populated countries, the majority of power demand is fulfilled from fossil fuel. Despite having lots of rivers, Bangladesh has not explored its true potential. So, this paper presents a comprehensive review of the current hydropower potential in Bangladesh. Locations having hydropower potential is evaluated. Different technologies used for hydropower generation have been reviewed. Moreover, global hydropower potential has also been discussed in this study. Based on the economic and environmental study, it is found that small scale hydropower is most feasible in Bangladesh to provide sustainable energy. With a reasonable flow rate, 232 rivers of Bangladesh can be utilized small scale hydropower generation as well as ensuring energy security for remote people. The current study is believed to provide useful information in advancing the generation of hydropower based electricity in Bangladesh.
An overview of the hydropower production potential in Bangladesh to meet the energy requirements
Monirul Islam Miskat,Ashfaq Ahmed,Md Salman Rahman,Hemal Chowdhury,Tamal Chowdhury,Piyal Chowdhury,Sadiq M. Sait,Young-Kwon Park 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Current environmental catastrophes generating from fossil fuel power generation has attracted the attention of energy planners to look for sustainable energy sources. Hydropower is one of the oldest energy sources that have been utilized all over the world to generate electricity, especially in remote areas. Being one of the most densely populated countries, the majority of power demand is fulfilled from fossil fuel. Despite having lots of rivers, Bangladesh has not explored its true potential. So, this paper presents a comprehensive review of the current hydropower potential in Bangladesh. Locations having hydropower potential is evaluated. Different technologies used for hydropower generation have been reviewed. Moreover, global hydropower potential has also been discussed in this study. Based on the economic and environmental study, it is found that small scale hydropower is most feasible in Bangladesh to provide sustainable energy. With a reasonable flow rate, 232 rivers of Bangladesh can be utilized small scale hydropower generation as well as ensuring energy security for remote people. The current study is believed to provide useful information in advancing the generation of hydropower based electricity in Bangladesh.
Hee-Sung Chae,Olivia Dale,Tahir M. Mir,Mohammad K. Ashfaq,Bharathi Avula,Larry A. Walker,Ikhlas A. Khan,Shabana I. Khan 한국식품영양과학회 2023 Journal of medicinal food Vol.26 No.5
The berries of Juniperus communis have been traditionally used for therapeutic purposes. They have been reported to possess various pharmacological effects such as anti-inflammatory, hypoglycemic and hypolipidemic activities. In this study, a methanolic extract of J. communis berries (JB) was evaluated for its effects on peroxisome proliferator-activated receptors alpha and gamma (PPARα and PPARγ), liver X receptor (LXR), glucose uptake and lipid accumulation using various cellular systems. At a concentration of 25 μg/mL, JB caused 3.77-fold activation of PPARα, 10.90-fold activation of PPARγ, and 4.43-fold activation of LXR in hepatic cells. JB inhibited (11%) the adipogenic effect induced by rosiglitazone in adipocytes and increased glucose uptake (90%) in muscle cells. In high-fat diet (HFD) fed mice, JB at a dose of 25 mg/kg body weight exhibited a 21% decrease in body weight. Fasting glucose levels in mice treated with 12.5 mg/kg of JB were significantly decreased (39%) indicating its efficacy in regulating hyperglycemia and obesity induced by HFD thus ameliorating the symptoms of type 2 diabetes. A series of energy metabolic genes, including Sirt1 (2.00-fold) and RAF1 (2.04-fold), were upregulated by JB, while rosiglitazone regulated the hepatic PPARγ only. Phytochemical analysis of JB indicated presence of a number of flavonoids and biflavonoids which seem to be responsible for the observed activity. It was concluded that JB acted as a multiple agonist of PPARα, PPARγ and LXR without the undesired effect of adipogenesis and exhibited the property of enhancing glucose uptake. The regulation of PPARα, PPARγ and LXR seems to be through Sirt1 and RAF1. In vivo results confirmed the antidiabetic and antiobesity potential of JB and indicated its utility in metabolic disorder and type 2 diabetes.
Maira Shabir,Nasir Shezad,Iqrash Shafiq,Ibrahim M. Maafa,Parveen Akhter,Kshaf Azam,Ashfaq Ahmed,See Hoon Lee,Young-Kwon Park,Murid Hussain 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
A visible-light active N,S-codoped TiO2 incorporated with carbon nanotubes (CNTs) was synthesized by amulticomponent heterojunction scheme. The synthesized photocatalysts was examined by several analysistechniques. The conventional TiO2, N-doped TiO2, TiO2/CNT and N,S-codoped TiO2 were also synthesized,characterized, and integrated adsorptive-photocatalytic degradation rates were subsequentlycompared and assessed, for comparative purposes as reference photocatalysts. The parametric studywas also carried out to investigate the effect of various operational factors, such as solution pH, the photocatalystloading and initial concentration of dye solution, on the adsorptive-photocatalytic performance. The best activity performance was attained with the N,S-TiO2/CNTs nanocomposite due to thesynergistic effect of ternary components caused by the incorporation of dopants and CNTs in TiO2 lattice,providing a high number of adsorption sites and facilitating the effective separation of photogeneratedcharge carriers and minimal recombination rates. N,S-TiO2/CNTs exhibited around three times higherphotocatalytic performance than that of the binary composites, i.e., N-TiO2, TiO2/CNTs, N,S-TiO2, andabout four times higher than the conventional TiO2. Furthermore, the superior nanocomposites were alsoinvestigated for their recyclability for five consecutive cycles.