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Mohammad Mahbubur Rahman,Xiao-Bo Li,Nasrin Siraj Lopa,이재준 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
Sub-micrometer size gold particles were electrodeposited on a transparent fluorine-doped tin oxide (FTO) from acetonitrile solution containing AuCl4 − and tetramethylammonium tetraflouroborate (TMATFB) for detecting NO2 −. A series of two-electron (2e−) and one-electron (1e−) reductions of the AuCl4 −-AuCl2 −-Au redox systems were observed at FTO and a highly stable and homogeneous distribution of Au on FTO (Au/FTO) was obtained by stepping the potential from 0 to −0.55 V (vs. Ag/Ag+). The Au/FTO electrode exhibited sufficiently high catalytic activity toward the oxidation of NO2 − with a detection limit (S/N = 3) and sensitivity of 2.95 μM and 223.4 μA·cm−2·mM−1, respectively, under optimal conditions. It exhibited an interference-free signal for NO2 − detection with excellent recoveries from real samples.
Effect of Titanium Nanorods in the Photoelectrode on the Efficiency of Dye Sensitized Solar Cells
Mohammad Mahbubur Rahman,김현용,Young-Deok Jeon,정인수,노광모,이재준 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
The effect of TiO2 nanorods (TNR) and nanoparticles (TNP) composite photoelectrodes and the role of TNR to enhance the energy conversion efficiency in dye-sensitized solar cells (DSSCs) was investigated. The 5% TNR content into the TNP photoelectrode significantly increased the short-circuit current density (Jsc) and the open-circuit potential (Voc) with the overall energy conversion efficiency enhancement of 13.6% compared to the pure TNP photoelectrode. From the photochemical and impedemetric analysis, the increased Jsc and Voc for the 5% TNR/TNP composite photoelectrode was attributed to the scattering effect of TNR, reduced electron diffusion path and the suppression of charge recombination between the composite photoelectrode and electrolyte or dye.
M. Mahbubur Rahman,Eunmok Kim,Mohammad M. H. Bhuyain,Dongmok Kim,Un Taek Lim 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Riptortus pedestris is an important soybean pest in Korea and Japan. Aggregation pheromone traps were evaluated in 12 soybean fields in Andong using three treatments of trap installation, i.e., installation for whole cultivation period, installation up to September, and no installation. The number of R. pedestris (in all life stages) were not significantly different among the treatments until October, but its abundance significantly increased at mid October in the fields where traps were installed. Trap catch of R. pedestris was relatively higher in August while bug population was low in the fields. However, in fall, R. pedestris populations become abundant in the fields while trap catch was low. There was no significant difference in parasitism as well as seed and pod damage among the treatments. In conclusion, aggregation pheromone trap should’nt be used as control measure, but can be used as a monitoring tool of R. pedestris population up to August in soybean field.
Mohammad Meftahul Ferdaus,Muhammad Mahbubur Rashid,Muhammad Hasibul Hasan,Mohammed Ataur Rahman 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
Magnetorheological (MR) damper is one of the most advanced applications of semi active damper in controlling vibration. Due to itscontinuous controllability in both on and off state its practice is increasing day by day in the vehicle suspension system. MR damper’sdamping force can be controlled by changing the viscosity of its internal magnetorheological fluids (MRF). But still there are some problemswith this damper such as MR fluid’s sedimentation, optimal design configuration considering all components of the damper. In thispaper both 2-D Axisymmetric and 3-D model of MR Damper is built and finite element analysis is done for design optimization. Differentconfigurations of MR damper piston, MR fluid gap, air gap and Dampers housing are simulated for comparing the Dampers performancevariation. From the analytical results it is observed that among different configurations single coil MR damper with linear plastic airgap, top and bottom chamfered piston end and medium MR fluid gap shows better performance than other configurations by maintainingthe same input current and piston velocity. Further an experimental analysis is performed by using RD-8041-1 MR Damper. These resultsare compared with the optimized MR Damper’s simulation results, which are clearly validating the simulated results.
Md. Mahbubur Rahman,Nazmun Naher,Md. Mofijul Isam,Moinul Hasan,Farhana Naznin,Mohammad Musharraf Uddin Bhuiyan,Farida Yeasmin Bari,Nasrin Sultana Juyena 한국동물생명공학회(구 한국동물번식학회) 2020 Journal of Animal Reproduction and Biotechnology Vol.35 No.2
The pregnancy rate in indigenous ewes inseminated with frozen-thawed Suffolk semen following natural and synchronized estrus was determined. The serum Progesterone and Estrogen concentration and vaginal electrical resistance (VER) of ewes at the time of Artificial Insemination (AI) were observed as successful pregnancy determinants. 21 healthy ewes were selected for this experiment during January-April, 2017. 10 ewes were inseminated in natural estrus. Whereas, 11 ewes were inseminated after estrus synchronization using intravaginal sponges containing 60 mg medroxyprogesterone acetate. Trans-cervical Al (TCAI) was performed in all ewes within 12-16 hours of observed heat. Prostaglandin E1 analogue impregnated vaginal sponge was used for cervical relaxation 6-8 hours before insemination. Pregnancy was diagnosed through trans-abdominal ultrasonography after 40 days of AI. The pregnancy rate of ewes in synchronized estrus was higher (54.5%) than in natural estrus (30%). Higher serum Progesterone level (0.90 ± 0.02 ng/mL) and significantly (p < 0.001) lower VER (257.78 ± 10.11 ohm) were observed at the time of AI in ewes becoming pregnant. Results suggest that higher Progesterone concentration and lower VER could be considered as pregnancy indicators. Oestrous synchronization could be implemented to increase the pregnancy rate in ewes.
Md Mahbubur Rahman,Mohammad Saiful Islam,Adam G.O,Md. Rafiqul Alam,유명조 한국임상수의학회 2014 한국임상수의학회지 Vol.31 No.3
Acidosis conditions either acute or chronic following ingestion of excessive amounts of readily fermentedcarbohydrate are great production problems for goat in Bangladesh. This study designed to investigate the prevalenceof lactic acidosis and then response to different therapeutic agents. For this purpose, 1,128 goat were examined atoutdoor District Veterinary Hospital, Faridpur, Bangladseh for treatment of which 40 goats were found positive forlactic acidosis showing 3.55% prevalence of disease. The highest occurrence found in female (4.64%) of over 3 yearsage (4.64%) in indigenous goat (2.7%). For therapeutic assessment the forty affected goats were divided into fourgroups A, B, C and D comprising of 10 animals each. Group A were given magnesium hydroxide 8% w/v at 1 g/kg body weight orally. In group B magnesium hydroxide 8% w/v at a dose as group A combination with 7.5% sodiumbicarbonate at the rate of 0.9 ml/Kg body weight intravenously administered. Goat in group D were treated with mixtureof ginger, nuxvomica, sodium carbonate, cobalt sulphate, dried ferrous sulphate and thiamin mononitrate at the rateof 1 g/kg body weight orally. Goat of group C treated with combination drugs of group A, B and D. The rectaltemperature, pulse rate, respiration rate, was performed before and after treatment. It was found that the highest recoveryin group C with an average period of 21 ± 1.8 hours. It was concluded that lactic acidosis is a common disease ofgoats and its severity can be effectively reduced by using combination drugs.
Md Mahbubur Rahman,Nazmun Naher,Md. Mofijul Isam,Moinul Hasan,Farhana Naznin,Mohammad Musharraf Uddin Bhuiyan,Farida Yeasmin Bari,Nasrin Sultana Juyena 사단법인 한국동물생명공학회 2020 한국동물생명공학회지 Vol.35 No.2
The pregnancy rate in indigenous ewes inseminated with frozen-thawed Suffolk semen following natural and synchronized estrus was determined. The serum Progesterone and Estrogen concentration and vaginal electrical resistance (VER) of ewes at the time of Artificial Insemination (AI) were observed as successful pregnancy determinants. 21 healthy ewes were selected for this experiment during January-April, 2017. 10 ewes were inseminated in natural estrus. Whereas, 11 ewes were inseminated after estrus synchronization using intravaginal sponges containing 60 mg medroxyprogesterone acetate. Trans-cervical Al (TCAI) was performed in all ewes within 12-16 hours of observed heat. Prostaglandin E1 analogue impregnated vaginal sponge was used for cervical relaxation 6-8 hours before insemination. Pregnancy was diagnosed through trans-abdominal ultrasonography after 40 days of AI. The pregnancy rate of ewes in synchronized estrus was higher (54.5%) than in natural estrus (30%). Higher serum Progesterone level (0.90 ± 0.02 ng/mL) and significantly (p < 0.001) lower VER (257.78 ± 10.11 ohm) were observed at the time of AI in ewes becoming pregnant. Results suggest that higher Progesterone concentration and lower VER could be considered as pregnancy indicators. Oestrous synchronization could be implemented to increase the pregnancy rate in ewes.
Faiz Ahmed,Mohammad Mahbubur Rahman,Sabuj Chandra Sutradhar,Nasrin Siraj Lopa,류태욱,윤수진,최인환,김재웅,Yongcheng Jin,김환기 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
This research demonstrates the synthesis of an imidazolium functionalized imide based electrolyte salt,lithium (fluorosulfonyl)((3-(1-methyl-1H-imidazol-3-ium-3-yl)propyl)sulfonyl)imide) bis(trifluorosulfonyl)imide (LiFSMIPTFSI) for the development of lithium-ion battery (LIB). The LiFSMIPTFSI electrolytewith a mix-solvent of ethylene carbonate (EC) and dimethyl sulfoxide (DMSO) (75:25 v/v) shows highelectrochemical oxidative stability (up to 5.3 V vs. Li/Li+), good Li+ conductivity (ca. 6.10 mS/cm at 30 C)and transference number (ca. 0.55), and low viscosity, which concurrently provide a specific capacity ofca. 141 mAhg 1 at 0.1 C with a full LIB structure of LiFePO4/LiFSMIPTFSI/graphite. The electrochemicalperformance of this electrolyte is enhancing additionally by adding conventional imide salts (lithium bis(fluoro-sulfonyl)imide (LiFSI) and lithium bis(trifluoromethylsulfonyl)imide (LiTFSI)) (20% each) asadditives with the specific capacity of ca. 160 and 150 mAhg 1, respectively, at 0.1 C. This is mainly due tothe additional enhancement of Li+ conductivity and transference number of the LiFSMIPTFSI electrolyteinduce by the additives. The LiFSMIPTFSI electrolyte with LiFSI additive based LIB shows the maximumcapacity retention of ca. 95.50% among the electrolytes after 500 charge-discharge cycles, along with highcoulombic efficiency (98.50%).
Graphene-incorporated Photoelectrodes for Dye-sensitized Solar Cells#
Chuangye Ge,Mohammad Mahbubur Rahman,Narayan Chandra Deb Nath,주명종,노광모,이재준 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.3
Graphene, a single-atom-thick planar sheet of hexagonally arrayed sp2 carbon atoms has attracted significant interest in the last decade in material science and energy related research. In particular, graphene has attracted considerable attention for the development of photoelectrodes of dye-sensitized solar cells (DSSCs). The incorporation of graphene into DSSCs photoelectrodes induced lower recombination, increased electron transport kinetics, enhanced light scattering effect, and concurrently enhanced the power conversion efficiency (PCE). Graphene has been incorporated into the TiO2 either by mixing or as an interfacial layer between TCO|TiO2, TiO2|dye, and TiO2|TiO2. Few studies have demonstrated the incorporation of graphene into ZnO- and NiO-based DSSCs. In all cases, the graphene-incorporated DSSC showed improved PCE. This article reviews the recent advances in the use of graphene as a photoelectrode building material in dye-sensitized solar cells (DSSCs).