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Location-allocation modeling for emergency evacuation planning with GIS and remote sensing:A case study of Northeast Bangladesh

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Geoscience Frontiers 2021年第3期12卷 169-185页

作者： Mahfuzur rahman Ningsheng Chen md.onirul Islam Ashraf Dewan Hamid Reza Pourghasemi Rana Muhammad AliWashakh Nirdesh Nepal Shufeng Tian Hamid Faiz Mehtab Alam Naveed Ahmed Key Laboratory for Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment(IMHE)Chinese Academy of Sciences(CAS)Chengdu 610041China University of Chinese Academy of Sciences(UCAS) Beijing 100049China Department of Civil Engineering International University of Business Agriculture and Technology(IUBAT)Dhaka 1230Bangladesh School of Earth and Planetary Sciences Curtin UniversityKent StBentleyWA 6102Australia Department of Natural Resources and Environmental Engineering College of AgricultureShiraz UniversityShirazIran School of Architecture Neijiang Normal UniversityNeijiang 641100China Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China Global Institute for Interdisciplinary Studies Kathmandu 3084Nepal

This work developed models to identify optimal spatial distribution of emergency evacuation centers(EECs)such as schools,colleges,hospitals,and fire stations to improve flood emergency planning in the Sylhet region of northeastern *** use of location-allocation models(LAMs)for evacuation in regard to flood victims is essential to minimize disaster *** the first step,flood susceptibility maps were developed using machine learning models(MLMs),including:Levenberg-Marquardt back propagation(LM-BP)neural network and decision trees(DT)and multi-criteria decision making(MCDM)*** of the MLMs and MCDM techniques were assessed considering the area under the receiver operating characteristic(AUROC)*** approaches in a geographic information system(GIS)for four well-known LAM problems affecting emergency rescue time are proposed:maximal covering location problem(MCLP),the maximize attendance(MA),p-median problem(PMP),and the location set covering problem(LSCP).The results showed that existing EECs were not optimally distributed,and that some areas were not adequately served by EECs(i.e.,not all demand points could be reached within a 60-min travel time).We concluded that the proposed models can be used to improve planning of the distribution of EECs,and that application of the models could contribute to reducing human casualties,property losses,and improve emergency operation.

关键词： Natural disasters Emergency evacuation centers Flooding Machine learning Multi-criteria decision making Location-allocation model

Study of the Physical, Mechanical and Thermal Properties of Banana Fiber Reinforced HDPE Composites

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Materials Sciences and Applications 2020年第4期11卷 245-262页

作者： Budrun Neher Rakib Hossain Kaniz Fatima M. A. Gafur md. Abul Hossain Farid Ahmed Department of Physics Jahangirnagar University Dhaka Bangladesh Department of Physics Bangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalganj Bangladesh PP and PDC Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh

Natural fiber reinforced composite materials are replacing the conventional materials, owing to their excellent physical, mechanical, electrical, and thermal properties. Also they increase biodegradability, reduce cost and decrease environmental pollution and hazards. In this study, obsolete high density polyethylene (HDPE) has used as polymer matrix and banana fiber as reinforcement material. Composites (5%, 10%, 15% and 20% of fiber contents) were made by hot press molding method by using Paul-Otto Weber Hydraulic press machine. The physical, mechanical and thermal properties of banana fiber-HDPE composites were studied and investigated the increment or decrement nature of different properties due to addition of banana fiber in BF-HDPE composites. The bulk density of composites increased with the increase wt. (%) of fiber content in composites. Water absorption ability of banana fiber and BF-HDPE composites also increased with the increase of wt. (%) of fiber content in composites and with socking time. Tensile strength of the BF-HDPE composites increased with the increase of fiber content in both cases (continuous aligned fiber orientation and continuous bidirectional fiber orientation). Moreover, the tensile strength of BF-HDPE composites with continuous aligned fiber orientation was greater than that of continuous bidirectional fiber orientation. At first, the flexural strength increased for 5% BF-HDPE composites then the value decreased for other higher compositions. The flexural strength of continuous aligned fiber orientation was slightly greater than that of continuous bidirectional fiber orientation and composite with 5% banana fiber showed better flexural properties than others. Leeb’s rebound hardness decreased with the increase of fiber addition. Different thermal properties like TG/DTG, DTA of the obsolete HDPE and BF-HDPE composites were studied using thermo gravimetric analyzer and it was found that composite with 20% fiber content was more thermally

关键词： BF-HDPE Water Absorption Tensile Strength Hardness TG-DTG

Discretization of Complex Geometric Domain Through Computer-Based Stair-Step Representation Method for Estimating Water Levels Associated with A Storm

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China Ocean Engineering 2022年第5期36卷 791-801页

作者： md.Mahabub Alam Gour Chandra Paul Irfan Raju Foyjonnesa Farhana Zannat Eti Mst.Sharmin Banu Dipankar Kumar md.Emran Ali Department of Applied Mathematics Gono BishwabidyalayDhaka-1344Bangladesh Department of Mathematics University of RajshahiRajshahi-6205Bangladesh Department of Arts&Sciences Bangladesh Army University of Science and TechnologySaidpur-5310Bangladesh Department of Mathematics European University of BangladeshDhaka-1216Bangladesh Department of Mathematics Jashore University of Science and TechnologyJashore-7408Bangladesh Department of Mathematics Bangabandhu Sheikh Mujibur Rahman Science and Technology UniversityGopalganj 8100Bangladesh Department of Textile Engineering Northern University of BangladeshDhaka 1230Bangladesh

In this paper,an improvement has been made to the approximation technique of a complex domain through the stair-step approach to have a considerable accuracy,minimize computational cost,and avoid the hardship of manual work.A novel stair-step representation algorithm is used in this regard,where the entire procedure is carried out through our developed MATLAB *** C-grid is used in our approximation with(1/120)°grid *** a test case,the method is applied to approximate the domain covering the area between 15°-23°N latitudes and 85°-95°E longitudes in the Bay of *** with the approximation of the land-sea interface,coastal stations are also *** land-sea interfaces and coastal stations are found to be in good agreement with the actual ones based on the similarity index,overlap fraction,and extra fraction *** method can be used for approximating an irregular geometric domain to employ the finite difference method in solving problems related to long *** a test case,shallow water equations in Cartesian coordinates are solved on the domain of interest for simulating water levels due to the nonlinear tide-surge interaction associated with the storms April 1991 and AILA,2009 along the coast of *** same input except for the discretized domain and bathymetry as that of Paul et al.(2016)is used in our *** results are found to be in reasonable agreement with the observed data procured from Bangladesh Inland Water Transport Authority.

关键词： Arakawa C-grid Bay of Bengal coast of Bangladesh finite difference method shallow water equations stair-step representation

Phytochemical screening, antioxidant and cytotoxic activity of fruit extracts of Calamus tenuis Roxb

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Journal of Coastal Life Medicine 2014年第8期 645-650页

作者： Zaki Uddin Ahmed Seheli Sejuti Bithi md.Minhazur rahman Khan md.Mofazzol Hossain Suriya Sharmin Satyajit Roy Rony Department of Pharmacy Jahangirnagar UniversitySavarDhaka-1342Bangladesh University of Information Technology and Sciences(Uits) Gulshan-2Dhaka-1212Bangladesh Pharmaceutical Sciences Research Division BCSIR LaboratoriesDhakaBCSIRDhaka-1205Bangladesh

Objective:To investigate the antioxidant and cytotoxic activity of the fruits of Calamus tenuis ***:The preliminary phytochemical group tests were done,which revealed the presence of alkaloid,tannin,flavonoid and *** dried fruit was extracted in soxhlet apparatus using petroleum ether,ethyl acetate and *** potential of each extract was evaluated using total phenol content,total flavonoid content,cupric reducing antioxidant capacity,1,1-diphenyl-2-picrylhydrazyl radical scavenging activity,and total antioxidant capacity ***:The extracts were found to possess moderate to high amounts of phenolic and flavonoid *** cupric reducing antioxidant capacity assay the extracts showed moderate reducing power which increases with *** of 1,1-diphenyl-2-picrylhydrazyl radical was found to rise with concentration with lowest IC_(50)value for methanol extract,which was confirmed by total antioxidant activity test that shows highest(95 mg/g of extract)in ascorbic acid equivalent for methanol *** Brine shrimp lethality bioassay the methanol and petroleum ether extracts were found to be toxic to Brine shrimp nauplii,with LC_(50)of 25.53μg/mL and 28.07μg/mL respectively while the LC_(50)of the reference vincristine sulphate was 1.32μg/*** acetate extract was found to be moderately cytotoxic showing LC_(50)of 47.79μg/***:The results of the present study suggest that the fruits of Calamus tenuis Roxb possess antioxidant and cytotoxic ***,phytochemical screening reveals the presence of alkaloid,tannin,flavonoid and steroid,which may be responsible for the observed bioactivities.

关键词： Calamus tenuis Roxb Phytochemical screening Antioxidant Cytotoxicity

基于单细胞尺度的纳米移液管递送研究（英文）

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电化学(中英文) 2024年第11期 23-32+4-6页

作者：张鹤 md.Maksudur rahman 陶洋 Joseph W.Sampson 任航 Department of Chemistry The University of Texas at Austin Center for Electrochemistry The University of Texas at Austin Texas Materials Institute The University of Texas at Austin

基于纳米移液管的电化学扫描探针技术是一种多功能非接触成像工具,并被广泛应用于生物学研究。除了一般的表面形貌成像研究外，它在局部递送生物活性分子方面的潜力也逐渐显现。在这篇简短综述中，我们介绍了这种技术在单细胞研究中的... 详细信息

基于纳米移液管的电化学扫描探针技术是一种多功能非接触成像工具,并被广泛应用于生物学研究。除了一般的表面形貌成像研究外，它在局部递送生物活性分子方面的潜力也逐渐显现。在这篇简短综述中，我们介绍了这种技术在单细胞研究中的应用，特别是局部递送。我们总结并比较了三种递送模式的工作原理，包括阻抗脉冲、压力驱动和电渗流驱动递送，还回顾了这些模式在单细胞研究中的应用。此外，本文还讨论了基于扫描离子电导显微镜的递送技术所面临的技术挑战及其在医学和药理学研究中日益增长的影响力。

关键词：扫描离子电导显微镜纳米移液管单细胞成像局部递送

Impact of COVID-19 pandemic on radiology education,training,and practice:A narrative review

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World Journal of Radiology 2021年第11期13卷 354-370页

作者： md.Anwarul Azim Majumd.r Uma Gaur Keerti Singh Latha Kandamaran Subir Gupta Mainul Haque Sayeeda rahman Bidyadhar Sa Mizanur rahman Fidel Rampersad Faculty of Medical Sciences The University of the West IndiesCave Hill CampusCave Hill BB23034Barbados Unit of Pharmacology Faculty of Medicine and Defence HealthUniversiti Pertahanan Nasional Malaysia(National Defence University of Malaysia)Kem Perdana Sugai BesiKuala Lumpur 57000Malaysia School of Medicine American University of Integrative Sciences(AUIS)Bridgetown BB11318Barbados Faculty of Medical Sciences The University of the West IndiesSt Augustine CampusSt Augustine 33178Trinidad and Tobago Principal's Office International Medical CollegeDhaka 1207Bangladesh

Radiology education and training is of paramount clinical importance given the prominence of medical imaging utilization in effective clinical *** incorporation of basic radiology in the medical curriculum has continued to evolve,focusing on teaching image interpretation skills,the appropriate ordering of radiological investigations,judicious use of ionizing radiation,and providing exposure to interventional *** in radiology have been driven by the digital revolution,which has,in turn,had a positive impact on radiology education and *** the advent of the corona virus disease 2019(COVID-19)pandemic,many training institutions and hospitals adhered to directives which advised rescheduling of non-urgent outpatient *** inevitably impacted the workflow of the radiology department,which resulted in the reduction of clinical in-person case reviews and consultations,as well as in-person teaching *** medical schools and research centers completely suspended face-to-face academic *** led to challenges for medical teachers to complete the radiology syllabus while ensuring that teaching activities continued safely and *** a result,online teaching platforms have virtually replaced didactic face-to-face *** educators also sought other strategies to incorporate interactive teaching sessions while adopting the e-learning approach,as they were cognizant of the limitations that this may have on students’clinical *** to online methods to review live cases,journal clubs,simulation-based training,clinical interaction,and radiology examination protocolling are a few examples of successfully addressing the limitations in reduced clinical *** this review paper,we discuss(1)The impact of the COVID-19 pandemic on radiology education,training,and practice;(2)Challenges and strategies involved in delivering online radiology education for undergraduates and postgraduates d

关键词： Radiology Education Training Practice COVID-19 pandemic Impact

Effect of Cerium Doping on Microstructure and Dielectric Properties of BaTiO_3 Ceramics

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Journal of Materials Science & Technology 2011年第8期27卷 759-763页

作者： Sabina Yasmin Shamima Choudhury M.A. Hakim A.H. Bhuiyan M.J. rahman Department of Physics University of Dhaka Materials Science Division Atomic Energy Centre Department of Physics Bangladesh University of Engineering and Technology

A solid state reaction method was used to synthesize barium titanate （BT） and barium cerium titanate （BCT） ceramics at sintering temperature of 1473 K for 4 h. The effect of cerium （Ce） on the structure, microstructure and dielectric properties of BCT was investigated. The scanning electron microscopy （SEM） investigations revealed that the grain size increases with increasing Ce content. The X-ray diffraction （XI^D） patterns showed mostly the BT phase, where the lattice parameter decreased with the addition of Ce. The temperature dependence of dielectric constant showed decrease in the phase transition temperature with higher Ce content. The dielectric constant decreased slightly with increasing frequency. The direct current （dc） density-voltage characteristics of the ceramics showed ohmic behavior for both the BT and BCT. As the temperature increased, the dc resistivity of the ceramics decreased. The activation energy increased with increasing Ce content.

关键词： Cerium doped Ba1-xCexTiO3 Dielectric constant Current density

Functional Characterization of Three VQ Motif-containing Genes in Rice-Xoo Interaction

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Functional Characterization of Three VQ Motif-containing Gen...

作者：马福泽（md.MAHFUZUR rahman）华中农业大学

学位级别：硕士

Plants are frequently exposed to various environmental stresses,including abiotic and biotic stresses such as drought,freezing,nutrient deficiency and pathogen infection and therefore have developed complex mechanisms to quickly respond and finally adapt to these stresses and that direct to immune *** responses are usually referred to as disease ***（Oryza sativa L）is the staple food crop for more than half of the world’s *** bacterial blight,caused by the bacterial pathogen Xanthomonas oryzae ***（Xoo）is the most devastating bacterial disease of rice,causing tremendous yield loss each year all over the *** the underlying mechanism of rice-pathogen interaction will not only provide genetic resources for rice breeding but also advance our knowledge towards plant-pathogen *** VQ motif-containing proteins（designated as VQ）are a class of plant-specific proteins with a conserved and single short FxxxVQxLTG amino acid sequence *** studies revealed that,VQ proteins in Arabidopsis have shown to influence to diverse physiological *** analysis of rice VQ genes under several stress treatments were assessed,specifically,following infection with the Xoo,treatment with abscisic acid（ABA）,or exposure to ***,the functions of rice VQ genes are *** this study,the function of OsVQ11（LOC

关键词：相互作用基序基因功能表征水稻细菌性枯萎病病原菌抗病性

Outcomes of Early Primary Endoscopic Realignment and Delayed Reconstruction in the Management of Posterior Urethral Injury in Male

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Journal of Biosciences and Medicines 2019年第10期7卷 1-16页

作者： Mohammad Nazmul Huda Prodyut Kumar Saha A. K. M. Shahidur rahman Mohammad Ibrahim Ali A. S. M. Humayun Kabir Munirunnessa Yeasmin Akter md. Mostafizur Rahmen Jannate Shaina Islam Nahid Kamal Department of Urology Dhaka Medical College Hospital (DMCH) Dhaka Bangladesh Department of Nephrology Bangabandhu Sheikh Mujib Medical University (BSMMU) Dhaka Bangladesh Department of Gynecology and Obstetrics Sir Salimullah Medical College & Mitford Hospital (SSMC & MH) Mitford Dhaka Bangladesh Department of Gynecology and Obstetrics Combined Military Hospital (CMH) Dhaka Bangladesh Department of Urology Medical College for Women & Hospital Uttara Dhaka Bangladesh Department of Pathology National Institute of Ophthalmology & Hospital Sher-E-Bangla Nagar Dhaka Bangladesh District Hospital Sherpur Bangladesh

Background: Posterior urethral injury usually occurs in male patients with pelvic fractures. Posterior urethral injuries are associated with considerable morbidity including urinary incontinence, erectile dysfunction and urethral stricture. Objective: To compare the outcomes between early primary endoscopic realignment and delayed reconstruction in the management of male patients of posterior urethral injury. Methodology: This prospective study was conducted in the department of urology and department of casualty, Dhaka Medical College Hospital, Dhaka, Bangladesh from July 2015 to June 2017 among 50 male patients with posterior urethral injury. Fifty patients were randomly allocated into two groups;the group A consisted of 24 patients underwent early primary endoscopic realignment within 10 days after posterior urethral injury and the group B consisted of 26 patients underwent delayed reconstruction in form of anastomotic urethroplasty after 3 months. All patients were followed up at 3rd, 6th and 9th month after the procedure. Outcome variables were post-operative urethral stricture, urinary incontinence and erectile dysfunction. Data were analyzed and compared by statistical tests. Results: The mean (±SD) age of the study patients was almost similar between the groups (28.8 ± 8.4 vs. 27.4 ± 7.2 years, p = 0.486). In group A, 83.33% patients developed postoperative urethral stricture, none of them developed urinary incontinence and 20.83% developed erectile dysfunction;On the other hand, in group B, these rates were 38.46%, 23.07% and 38.46% respectively. Postoperative urethral stricture formation was significantly higher in Group A (p = 0.0012) but urinary incontinence and erectile dysfunction rates were significantly higher in Group B (p = 0.018 and p = 0.042 respectively). Conclusion: Early primary endoscopic realignment is better than delayed reconstruction in the management of male patients with posterior urethral injury. It provides less postoperative complica

关键词： Endoscopic Realignment Erectile Dysfunction Urinary Incontinence Urethral Injury Urethral Stricture