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Md. Rakib Hasan,Nizam Uddin,Tanmoy Sana,Md. Monir Hossain,Milon Mondal,Ismat Jarin Kanta,M. S. K. Choudhuri 경희대학교 융합한의과학연구소 2018 Oriental Pharmacy and Experimental Medicine Vol.18 No.2
The aim of our current study is to investigate the analgesic and anti-inflammatory potentials of methanolic extract of Mallotus repandus stem (MSM) using different in vivo assay models. Analgesic and anti-inflammatory activities were evaluated using acetic acid induced writhing test, tail immersion method, hot-plate test, formalin induced hind paw licking, xylene induced ear edema, carrageenan-induced paw edema and cotton pellet induced granuloma in animal model at doses of 500, 1000 and 2000 mg/kg body weight. MSM showed significant (p < 0.05) analgesic activities in the acetic acid-induced writhing tests in mice. In the tail immersion and hot-plate test, MSM significantly prolonged the latency period (p < 0.05). Significant (p < 0.05) formalin induced paw licking inhibition was observed at different doses and the highest 74.47% inhibition was observed at 2000 mg/kg. Besides, MSM showed significant (p < 0.05) anti-inflammatory responses in carrageenan induced paw edema, xylene induced ear edema and cotton pellet induced granuloma methods. These findings suggest that the plant may be a potential source for the development of new analgesic and anti-inflammatory agent.
Nakarmi, Bikash,Rakib-Uddin, M,Won, Yong Hyub Optical Society of America 2011 Optics express Vol.19 No.15
<P>We propose a novel idea for the suppression of the dominant mode of the single-mode Fabry-Pérot laser diode (SMFP-LD) to realize all-optical multi-logic functions and a digital adder. The basic principle of the proposed scheme is the power management of input beams to suppress the dominant mode of the SMFP-LD for multi-input injection locking. The proposed principle is explained and implemented to realize all-optical multi-logic functions and a digital adder at an input data rate of 10 Gbps. A clear eye opening with an extinction ratio of about 12 dB and a rising-falling time of less than 40 ps are observed at the outputs. The bit error rate (BER) performance is measured for all logic gates and half adder operation. We found there is no BER floor up to BER of 10(-12) and the maximum power penalty of about 1.2 dB at a BER of 10(-9).</P>
Realization of All-Optical Digital Comparator Using Single Mode Fabry–Pérot Laser Diodes
Nakarmi, B.,Rakib-Uddin, M.,Yong Hyub Won IEEE 2011 Journal of Lightwave Technology Vol.29 No.19
<P>A two-bit all-optical digital comparator using single mode Fabry-Pérot laser diodes (SMFP-LDs) at an input data rate of 10 Gbps is proposed and demonstrated. All-optical comparator is demonstrated using cascaded logic units which are based on injection locking, multi-input injection locking and supporting beam principles for suppressing the dominant mode of SMFP-LDs. Digital comparators are the key components for the decision making circuits, the integral part of the arithmetic and logical units of optical data processors. The output performance of the proposed all-optical comparator is verified with output waveform, rising-falling time, output eye diagram, and bit error rate (BER) at 10 Gbps input Non Return to Zero (NRZ) PRBS of 2<SUP>31</SUP>-1 signal. The rising/falling time of about 47 ps, clear output waveforms, and clear output eye diagram with an extinction ratio of about 12 dB are obtained. A maximum power penalty of 1.3 dB is measured at a BER of 10<SUP>-9</SUP>.</P>
Demonstration of All-Optical nand Gate Using Single-Mode Fabry–Pérot Laser Diode
Nakarmi, B,Rakib-Uddin, M,Hoai, T Q,Yong Hyub Won IEEE 2011 IEEE photonics technology letters Vol.23 No.4
<P>A novel, simple, and universal all-optical NAND gate using single-mode Fabry-Pérot laser diode (SMFP-LD) is demonstrated. The basic operating principle of the proposed NAND gate is the modulation of the dominant lasing mode of SMFP-LD by the injection of external beams. The dominant lasing mode gain is suppressed only when both input beams are high. As SMFP-LD is used to demonstrate the logic function, no additional beam is required as needed in the multimode Fabry-Pérot laser diode (MMFP-LD) schemes. The operating principle is explained and the experimental results are presented at 10 Gb/s input data. The logic function is realized with a clear eye opening and an extinction ratio of 14.6 dB with a rising and falling time of 38.3 and 67.1 ps, respectively.</P>
Siraz M.M. Mahfuz,Rakib M.D.A.,Alam M.S.,Al Mahmud Jubair,Rashid Md Bazlar,Khandaker Mayeen Uddin,Islam Md. Shafiqul,Yeasmin S. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.8
In a first-of-its-kind study, terrestrial radionuclide concentrations were measured in 35 topsoil samples from the outskirts of Dhaka using HPGe gamma-ray spectrometry to assess the radiological consequences of such a vast number of brick kilns on the plant workers, general as well as dwelling environment. The range of activity concentrations of 226Ra, 232Th, and 40K is found at 19 ± 3.04 to 38 ± 4.94, 39 ± 5.85 to 57 ± 7.41, and (430 ± 51.60 to 570 ± 68.40) Bq/kg, respectively. 232Th and 40K concentrations were higher than the global averages. Bottom ash deposition in lowlands, fly ash buildup in soils, and the fallout of micro-particles are all probable causes of the elevated radioactivity levels. 137Cs was found in the sample, which indicates the migration of 137Cs from nuclear accidents or nuclear fallout, or the contamination of feed coal. Although the effective dose received by the general public was below the recommended dose limit but, most estimates of hazard parameters surpass their respective population weighted global averages, indicating that brick kiln workers and nearby residents are not safe due to prolonged exposures to terrestrial radiation. In addition, the soil around sampling sites is found to be unsuitable for agricultural purposes.