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Hasnat, G.N. Tanjina,Hossain, Mohammed Kamal,Alam, Mohammed Shafiul,Hossain, Md. Akhter Institute of Forest Science 2017 Journal of Forest Science Vol.33 No.3
Dhup (Canarium resiniferum) is an economically and aesthetically important rare native tree species of Bangladesh. In natural condition 78.5-98.7% seeds do not germinate due to inhibition by hard seed coat, seed predation and unfavorable environmental conditions. A study was conducted in the Seed Research Laboratory and nursery of Institute of Forestry and Environmental Sciences, Chittagong University, Bangladesh in 2013 to find out appropriate pre-sowing treatments for maximizing germination and initial seedling growth. Eleven pre-sowing treatments were provided in both the seeds sown in polybags and seeds sown in propagator house. Results revealed that, germination started at first (after 20 days of seed sown) in seeds immersed in water at room temperature for 24 hours and germination completed within 38 days. Significantly higher (p<0.05) germination percentage (33%), germination energy (16.7%), plant percent (33%) and germination value (0.4) was found with seeds immersed in water at room temperature for 24 hours. Seedling height measured at three, four and five months after the seed germination in case of seeds treated by immersion in water for 24 hours was also greater than others. Therefore, pre-sowing treatment by immersion in water at room temperature for 24 hours was more effective in germination and production of quality vigor seedlings of Dhup.
Hasnat, G.N. Tanjina,Hossain, Md. Akhter,Hossain, Mohammed Kamal,Uddin, Mohammad Main Institute of Forest Science 2019 Journal of Forest Science Vol.35 No.4
Castanopsis indica (Sil Batna) is an ecologically valuable multipurpose indigenous tree species of Bangladesh. Considering its high value but poor natural regeneration due to seed dormancy, the authors conducted an experiment at the Institute of Forestry and Environmental Sciences Chittagong University (IFESCU) during 2012-2013 to find out effective pre-sowing treatments. Ten pre-sowing seed treatments were applied on mature, even-sized seeds namely-control; sandpaper rubbing; nail clipping; immersion in normal water (at room temperature: 24℃) for 24 hrs., 48 hrs. and 72 hrs.; immersion in hot water (80℃) for 1 minute; soaking in 10% dilute H<sub>2</sub>SO<sub>4</sub>; soaking in 10% HCl for 5 minutes; and sowing in propagator house. Seeds sown after sandpaper rubbing at the distal end revealed best performances by providing highest germination percent (66.7%), germination energy (30%), germination index (0.17), germination rate (0.0145), germination value (30%) and plant percent (66.7%) within shortest period (38 days). The treatment also produced most vigor seedlings with 20.9 cm shoot height, 15 node number, and largest leaves (11.1 cm×2.9 cm). Hence, it is recommended to adopt sandpaper rubbing method for maximum germination and quality seedlings.
Power Profile Stabilization for Smart Grid Transmission Systems using STATCOM
Toha Hasnat,Asatilla Abdukhakimov,Dong-Seong Kim 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
This paper studies the shunt operation of the flexible AC transmission system (FACTS) controller. FACTS devices are mainly used for solving various power system steady state control problems such as voltage regulation, power flow control, and transfer capability enhancement. Static synchronous compensator (STATCOM) is a shunt FACTS device, which can be deployed to regulate the flow of reactive power in the system independently. The study of STATCOM including phase angle control is carried out. In the smart grid transmission systems, STATCOM primarily handles fundamental reactive power exchange and provide voltage support. According to the results, operating maintenance and investment costs with STATCOM are lower than other systems while providing stable power supply to consumers.
Mohammad A. Hasnat,Sami Ben Aoun,Mohammed M. Rahman,Abdullah M. Asiri,Norita Mohamed 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Asymmetric reactors having the configuration (PtjNafionjM–Cu, M = Pt, Pd) were designed and appliedto the electrocatalytic nitrate reduction reaction (NRR) with no supporting electrolyte. Theelectrochemically–fabricated Cu–M (M = Pt, Pd) catalysts showed a highly-efficient catalytic activityby effectively reducing more than ca. 99% of nitrate ions, under static-reactor conditions, with first-orderrate constants of ca. 0.040 min 1 and ca. 0.057 min 1 for Cu–Pt and Cu–Pd, respectively. Similarreactivity trends were observed under flow mode irrespective of flow rates while NRR rates werepredominantly controlled by diffusion-limited mass-transfer. A maximum of ca. 93% nitrate removal atCu–Pd catalyst was achieved within ca. 60 min. The comparatively lower CuO content of ca. 9%, asconfirmed by XANES, resulted in a greater number of free NRR active sites inducing the superior catalyticactivity of the Cu–Pd catalyst. On the other hand, NRR product selectivity investigations showed that Cu–Pd catalyst was highly ammonia–selective with a maximum of ca. 24% selectivity at a flow rate of0.1 mL min 1, while Cu–Pt catalyst was much selective to intermediate nitrite ions reaching a maximumof ca. 35% selectivity at the same flow rate.
Md. Abul Hasnat,Mehnaz Pervin,박사라,장용창,임지홍,김영준,김영옥,권혁중,임병우 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.2
The anti-inflammatory effects of oat extracts in vitro and in vivo were determined based on antioxidant functions. To examine the effect of oat extracts in murine macrophage RAW 264.7 cells, MTT assays were used and nitric oxide (NO) production was analyzed based on absorbance and inducible nitric oxide synthase (iNOS) expression levels using Western blot analysis. Immunoglobulin expression levels were determined using an enzyme-linked immunosorbent assay (ELISA). Oat extracts showed significant (p<0.05) antioxidant properties and restored the cell viability of LPS-stimulated RAW 264.7 cells, compared with controls. NO production and iNOS protein levels were also reduced by oat extracts. DSS (3%)-administered mice manifested symptoms similar to human colitis patients, and oat extracts attenuated the symptoms of colitis. Preventive and therapeutic administration of oat extracts used as antioxidants can ameliorate inflammatory conditions in cells and DSS-induced colitis in mice.
M.A. Hasnat,Jamil A. Safwan,M. Shariful Islam,Zidnia Rahman,Mohammad Razaul Karim,Talha J. Pirzada,Ahmed Jalal Samed,Mohammed M. Rahman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Electrochemical decolorization of Methylene blue (MB) molecules was studied at Pt electrode inpresence of KNO3 and KCl as the supporting electrolytes under acidic condition. The KNO3 electrolytedisplayed MB decolorization effect, where MB molecules exhibited two redox peaks at 0.48 V and0.34 V, respectively, in cyclic voltammogram (CV). The features of redox couples indicated thedimerization ofMBmolecules. In this simple preparation technique, a less amount of sample loading wasrequired, and the method displayed high efficiency toward decolorization of MB dye. This reportindicates the possibility for improving the quality of wastewater discharged from textile and otherindustries.