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World Journal of Nuclear Science and Technology 2021年第3期11卷 119-131页

作者： arif jahan sarawer M. Ajijul Hoq M. Abu Khaer M. Shafiqul Islam M. Mominur Rahman M. Tareque Chowdhury M. Mizanur Rahman Department of Physics Jahangirnagar University of Bangladesh Dhaka Bangladesh Institute of Energy Science Atomic Energy Research Establishment Bangladesh Atomic Energy Commission Dhaka Bangladesh

The assessment of the radiological concentration of 134Cs and 137Cs owing to hypothetical accident of TRIGA Mark-II research Reactor at AERE, Savar, Bangladesh is presented here in this work. The concentration of 134Cs and 137Cs was estimated in different pathways consisting of the ingestion of plants, milk, and meat. The highest air concentration has been determined at 65 m distance from the core of the reactor. The maximum concentration passed off without delay simply after the accident in various directions. Local meteorological information such as average wind velocity and wind frequency were analyzed. Considering all directions, the highest concentration has been observed in the “S” direction. The concentrations of 134Cs and 137Cs were determined in ground, vegetation, milk and meat. The concentration of 137Cs is investigated to be higher than the 134Cs. The concentration of 134Cs and 137Cs was found to be lower in vegetation, milk, and meat than that of ground concentration. Overall, in this study, the concentration in meat has been investigated to be lower. In case of a reactor accident, the concentration assessment due to the ingestion of vegetables, milk, and meat will be a valuable guide for insuring radiological protection across the research reactor at AERE, Savar, Bangladesh.

关键词： Concentration Hypothetical Accident Pathway Radiological Protection TRIGA Mark-II

Anti-inflammatory and antioxidant activities of ethanolic extract of aerial parts of Vernonia patula(Dryand.)Merr.

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Asian Pacific Journal of Tropical Biomedicine 2013年第10期3卷 798-805页

作者： Arpona Hira Shubhra Kanti Dey Md.Sariful Islam Howlader arif Ahmed Hemayet Hossain Ismet Ara jahan Pharmacy Discipline.Life Science School Khulna UniversityKhulna-9208Bangladesh Department of Pharmacy World University of BangladeshDhaka-1205Bangladesh BCSIR Laboratories.Dhaka.Bangladesh Council of Scientific and Industrial Research.Dr.Qudrat-E-Khuda Road Dhaka-1205Bangladesh

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 ***: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 *** 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/*** IC_(50)values of the extract and ascorbic acid were 47.72 and 12.39μg/mL,respectively in nitric oxide scavenging *** 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 *** total phenolic content was 198.81 mg/g of gallic acid *** 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 ***: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.

关键词： Vernonia patula Anti-inflammatory DPPH free-radical scavenging Nitric oxide radical scavenging Reducing power Acute toxicity

Modeling of Orientation-Dependent Photoelastic Constants in Cubic Crystal System

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Materials Sciences and Applications 2014年第4期5卷 223-230页

作者： Lubna jahan Rashid Pinky Shakila Islam Md. Nur Kutubul Alam Mohammad arif Hossain Md. Rafiqul Islam Department of Electrical and Electronic Engineering Khulna University of Engineering & Technology Khulna Bangladesh Department of Mathematics Khulna University of Engineering & Technology Khulna Bangladesh

Euler’s rotation theorem and tensor rotation technique are applied to develop a generalized mathematical model for determining photoelastic constants in arbitrary orientation of cubic crystal system. Two times rotations are utilized in the model relating to crystallographic coordinates with Cartesian coordinates. The symmetry of photoelastic constants is found to have strong dependence with rotation angle. Using the model, one can determine photoelastic constants in any orientation by selecting appropriate rotation angle. The outcome of this study helps to characterize spatial variation of residual strain in crystalline as well as polycrystalline materials having cubic structure using the experimental technique known as scanning infrared polariscope.

关键词： Mathematical Modeling Photoelastic Constants Arbitrary Crystal Orientation Euler’s Rotation Theorem Tensor Rotation Technique

Photonic Crystal Fiber Based Sensor for Detecting Binary Liquid Mixture

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Optics and Photonics Journal 2017年第11期7卷 221-234页

作者： Md. Faizul Huq arif Md. Jaminul Haque Biddut Md. Shaiful Islam Babu H M Mostafizur Rahman Md. Mahbubur Rahman Busrat jahan Moshrefa Sultana Chaity Shah Mostafa Khaled Institute of Information Technology (IIT) University of Dhaka Dhaka Bangladesh Automation and Robotics Faculty of Electrical Engineering and Information Technology (EEIT) TU Dortmund University Dortmund Germany Department of Computer Science and Engineering World University of Bangladesh Dhaka Bangladesh School of Information Technology BAC International Study Centre Dhaka Bangladesh Department of Computer Science and Engineering Feni University Feni Bangladesh Institute of Information Technology (IIT) Jahangirnagar University Dhaka Bangladesh

Detection of liquid mixture of different volume ratio is very important in industrial purposes. The paper reports a sensing mechanism of binary liquid mixture for different volume fraction, based on the measurement of refractive index of the mixture. Here, a highly sensitive liquid filled core Photonic Crystal Fiber structure has been proposed to detect liquid mixture solution. Numerical investigation of the proposed structure is carried out by employing full vectorial Finite Element Method (FEM).

关键词： Binary Liquid Mixture Photonic Crystal Fiber Refractive Index Sensitivity Confinement Loss