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| 1 | Proposal for dispersion compensating square-lattice photonic crystal fiber显示文摘A dispersion-compensating square-lattice photonic crystal fiber for broadband compensation which covers the S, C and L communication bands, i.e. wavelength ranging from 1 460 nm to 1 625 nm is proposed in this paper. Theoretically, it is shown a negative dispersion coefficient of about-595 ps/(nm·km) to-1 288 ps/(nm·km) over S to L bands and-975 ps/(nm·km) at the operating wavelength 1 550 nm. The relative dispersion slope is perfectly matched to that of conventional single-mode fiber of about 0.003 6 nm^(-1). Besides the proposed photonic crystal fiber shows the large nonlinear coefficient of 61.88 W/km at the operating wavelength of 1 550 nm. Moreover, the variation of structural parameters is also studied and discussed here. | Ashraful Hossain Howlader Md.Sherajul Islam S.M.A.Razzak | 2021 | Optoelectronics Letters2021，17，3： | 2 |
| 2 | Design and construction of a synthetic Bacillus thuringiensis Cry4Aa gene : H yperea'- pression in Escherichia coli 显示文摘 | TOHRU HAYAKAWA MOHAMMAD TOFAZZAL HOSSAIN HOWLADER | 2008 | Applied Microbiology and Biutechnology2008，80，6： | 1 |
| 3 | On Bayesian Estimation and Prediction from Rayleigh Based on Type Ⅱ Censored Data 显示文摘 | Howlader H A Hossain A | 1995 | Communications in Statistics: Theory and Methods1995，24，9： | 1 |
| 4 | Bayesian surviral estimation of Pareto distribution of the second kind based on failure-censored data 显示文摘 | Hatem A Howlader and Anwar M Hossain | 2002 | Computational Statistics & Data Analysis2002，38，： | 1 |
| 5 | Bayesian survival estimation of Pareto distribution of the second kind based on failure-censored data显示文摘 | Howlader H A Hossain A M | 2002 | Computational Statistics & Data Analysis2002，38，： | 1 |
| 6 | Anti-inflammatory and antioxidant activities of ethanolic extract of aerial parts of Vernonia patula(Dryand.)Merr.显示文摘Objective:To investigate the inflammatory and antioxidant activities of ethanolie extract of aerial part of Vernonia patula(Dryand.)Merr(EAV).Methods:The anti-inflammatory activity of EAV was studied using carrageenan and histamine-induced rat paw edema test at different doses(100.200 and 400 mg/kg body weight).DPPH free radical scavenging,nitric oxide scavenging,reducing power and Fe^(2+)ion chelating ability were used for determining antioxidant activities.Results:The EAV,at the dose of 400 mg/kg,showed a significant anti-inflammatory activity(P<0.01)both in the carrageenan and histamine-induced oedema test models in rats,showing62.86%and 64.42%reduction in the paw volume comparable to that produced by the standard drug indomethacin(67.26%and 66.01%)at 5 h respectively.In DPPH free radical scavenging test,IC_(50)value for EAV was found fairly significant 36.59μg/mL when compared to the IC_(50)value of the reference standards ascorbic acid 8.97μg/mL.The IC_(50)values of the extract and ascorbic acid were 47.72 and 12.39μg/mL,respectively in nitric oxide scavenging assay.The IC_(50)value of the EAV(33.59μg/mL)as percentage of Fe^(2+)ion chelating ability was also found significant compared to that of EDTA(9.16μg/mL).The maximum absorbance for reducing power assay was found to be1.928 at 100μg/mL when compared to 2.449 for standard ascorbic acid.The total phenolic content was 198.81 mg/g of gallic acid equivalent.Acute toxicity test showed that the plant might be safe for pharmacological uses up to a dose level of 3200 mg/kg of body weight in rats.Conclusions:Therefore,the obtained results suggest the acute anti-inflammatory and antioxidant activities of the EAV and thus provide the scientific basis for the traditional uses of this plant part as a remedy for inflammations. | Arpona Hira Shubhra Kanti Dey Md.Sariful Islam Howlader Arif Ahmed Hemayet Hossain Ismet Ara Jahan | 2013 | Asian Pacific Journal of Tropical Biomedicine2013，3，10： | 1 |
| 7 | Phonon transmission of vacancy disordered armchair silicene nanoribbon显示文摘This work demonstrates the atomic vacancy effects on the phonon properties of armchair silicene nanoribbon in a step by step process for the first time.The phonon localization effect figures out the fact that vacancies cause to high-energy phonons become localized,whereas low-energy phonons can easily transmit.The vacancy reduces high-energy phonon transmission severely compared to low-energy phonon.It is also found from phonon density of states that high-frequency phonons soften towards the low-frequency region.The simulated phonon bandstructure verifies that most of the phonon branches transform to a nondegenerate state from a degenerate state and shifted toward a lower frequency regime due to the presence of vacancies.The overall consequences of atomic vacancies on the phonon thermal conductance disclose the reality that only a few atomic vacancies result in a vital reduction of phonon thermal conductance.In addition,the entropy of the disordered system is investigated. | Ashraful Hossain Howlader Md.Sherajul Islam Naim Ferdous | 2021 | Optoelectronics Letters2021，17，8： | 0 |
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