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Journal of Forestry Research 2012年第1期23卷 23-28页

作者： Mohammad Raqibul Hasan Siddique Mahmood hossain md. Rezaul Karim Chowdhury Forestry and Wood Technology Discipline Khulna University Khulna-9208 Bangladesh

Tree biomass plays a key role in sustainable management by providing different aspects of ecosystem. Estimation of above ground biomass by non-destructive means requires the dex;elopment of allometric equations. Most researchers used DBH （diameter at breast height） and TH （total height） to develop allometric equation for a tree. Very few spe- cies-specific allometric equations are currently available for shrubs to estimate of biomass from measured plant attributes. Therefore, we used some of readily measurable variables to develop allometric equations such as girth at collar-height （GcH） and height of girth measuring point （GMH） with total height （TH） for A. rotundifolia, a mangrove species of Sundarbans of Bangladesh, as it is too dwarf to take DBH and too ir- regular in base to take Girth at a fixed height. Linear, non-linear and logarithmic regression techniques were tried to determine the best re- gression model to estimate the above-ground biomass of stem, branch and leaf. A total of 186 regression equations were generated from the combination of independent variables. Best fit regression equations were determined by examining co-efficient of determination （R：）, co-efficient of variation （Cv）, mean-square of the error （Ms^r）, residual mean error （Rmax）, and F-value. Multiple linear regression models showed more efficient over other types of regression equation. The performance of regression equations was increased by inclusion of GMn as an independ- ent variable along with total height and GCH.

关键词： Aegialitis rotundifolia allometry biomass mangroves sundarbans

Weather Variability,Socioeconomic Factors,and Pneumonia in Children Under Five-Years Old——Bangladesh,2012−2016

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China CDC weekly 2021年第29期3卷 620-623,I0001,I0002页

作者： Mohammad Zahid hossain Shilu Tong Hilary Bambrick md Alfazal Khan Wenbiao Hu School of Public Health and Social Work Institute of Health and Biomedical InnovationQueensland University of TechnologyBrisbaneQueenslandAustralia Infectious Diseases Division International Centre for Diarrhoeal Disease ResearchBangladeshMohakhaliDhakaBangladesh Shanghai Children’s Medical Centre School of MedicineShanghai Jiao Tong UniversityShanghaiChina School of Public Health Institute of Environment and Population HealthAnhui Medical UniversityHefeiAnhuiChina Center for Global Health School of Public HealthNanjing Medical UniversityNanjingJiangsuChina Health System and Population Studies Division International Centre for Diarrhoeal Disease ResearchBangladeshMohakhaliDhakaBangladesh

Summary What is already known on this topic?Different socioecological factors were associated with childhood pneumonia in ***,previous studies did not assess spatial patterns,and socioecological factors and spatial va... 详细信息

关键词： pneumonia Bangladesh ecological

Particles dispersion on fluid-liquid interfaces

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Particuology 2011年第1期9卷 1-13页

作者： Sathish Gurupatham Bhavin Dalal md.Shahadat hossain Ian S.Fischer Pushpendra Singh Daniel D.Joseph Department of Mechanical Engineering New Jersey Institute of Technology Department of Aerospace Engineering and Mechanics University of Minnesota Department of Mechanical and Aerospace Engineering University of California Irvine

This paper is concerned with the dispersion of particles on the fluid-liquid interface. In a previous study we have shown that when small particles, e.g., flour, pollen, glass beads, etc., contact an air-liquid interface, they disperse rapidly as if they were in an explosion. The rapid dispersion is due to the fact that the capillary force pulls particles into the interface causing them to accelerate to a large velocity. In this paper we show that motion of particles normal to the interface is inertia dominated; they oscillate vertically about their equilibrium position before coming to rest under viscous drag. This vertical motion of a particle causes a radially-outward lateral （secondary） flow on the interface that causes nearby particles to move away. The dispersion on a liquid-liquid interface, which is the primary focus of this study, was relatively weaker than on an air-liquid interface, and occurred over a longer period of time. When falling through an upper liquid the particles have a slower velocity than when falling through air because the liquid has a greater viscosity. Another difference for the liquid-liquid interface is that the separation of particles begins in the upper liquid before the particles reach the interface. The rate of dispersion depended on the size of the particles, the densities of the particle and liquids, the viscosities of the liquids involved, and the contact angle. For small particles, partial pinning and hysteresis of the three-phase contact line on the surface of the particle during adsorption on liquid-liquid interfaces was also important. The frequency of oscillation of particles about their floating equilibrium increased with decreasing particle size on both air-water and liquid-liquid interfaces, and the time to reach equilibrium decreased with decreasing particle size. These results are in agreement with our analysis.

关键词： Adsorption Interfacial tension Particle dispersion Fluid–liquid interface Capillary force Viscous drag

Medicinal potential of Passiflora foetida L. plant extracts: biological and pharmacological activities

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Journal of Integrative Medicine 2014年第2期12卷 121-126页

作者： md.Asadujjaman Ahmed Ullah Mishuk md.Aslam hossain Utpal Kumar Karmakar Pharmacy Discipline Life Science SchoolKhulna University Graduate School of Pharmaceutical Sciences Chiba University

OBJECTIVE： To investigate analgesic, antidiarrhoeal and cytotoxic activities of the ethanol extract of Passiflora foetida L. （Passifloraceae） by three experimental methods. METHODS： Analgesic activity of the ethanol extract of Passiflora foetida L. （EEPF） was carried out using acetic acid-induced writhing inhibition in mice. The method of castor oil-induced diarrhoea in mice was utilized to evaluate antidiarrhoeal activity. The cytotoxic activity of EEPF was explored with a brine shrimp lethality bioassay. RESULTS： The extract showed 68.75% and 30.00% inhibition of writhe at the doses of 500 and 250 mg/kg body weight, respectively. The extract increased the mean latent period prior to diarrhoeal onset to about 1.55 h and 1.17 h, and decreased the mean number of stools to 4.4 and 5.6 at the doses of 500 and 250 mg/kg body weight. The extract also demonstrated cytotoxic activity in the brine shrimp lethality assay, and the median lethal concentration for brine shrimp nauplii was 80 pg/mL. CONCLUSION： The results suggest that the plant extract has analgesic and antidiarrhoeal activities, supporting its uses in traditional medicine. The results also demonstrate that the plant extract possesses cytotoxic activities.

关键词： Passiflora plant extracts analgesics antidiarrheals cytotoxins mice

Incorporating the mutational landscape of SARS-COV-2 variants and case-dependent vaccination rates into epidemic models

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Infectious Disease Modelling 2022年第2期7卷 75-82页

作者： Mohammad Mihrab Chowdhury md Rafiul Islam md Sakhawat hossain Nusrat Tabassum Angela Peace Department of Mathematics and Statistics Texas Tech UniversityLubbockTXUSA Department of Mathematics Iowa State UniversityAmesIAUSA

Coronavirus Disease(COVID-19),which began as a small outbreak in Wuhan,China,in December 2019,became a global pandemic within months due to its high *** the absence of pharmaceutical treatment,various non-pharmaceutical interventions(NPIs)to contain the spread of COVID-19 brought the entire world to a *** almost a year of seemingly returning to normalcy with the world's quickest vaccine development,the emergence of more infectious and vaccine resistant coronavirus variants is bringing the situation back to where it was a year *** the light of this new situation,we conducted a study to portray the possible scenarios based on the three key factors:impact of interventions(pharmaceutical and NPIs),vaccination rate,and vaccine *** our study,we assessed two of the most crucial factors,transmissibility and vaccination rate,in order to reduce the spreading of COVID-19 in a simple but effective *** order to incorporate the time-varying mutational landscape of COVID-19 variants,we estimated a weighted transmissibility composed of the proportion of existing strains that naturally vary over ***,we consider time varying vaccination rates based on the number of daily new *** method for calculating the vaccination rate from past active cases is an effective approach in forecasting probable future scenarios as it actively tracks people's attitudes toward immunization as active case *** simulations show that if a large number of individuals cannot be vaccinated by ensuring high efficacy in a short period of time,adopting NPIs is the best approach to manage disease transmission with the emergence of new vaccine breakthrough and more infectious variants.

关键词： Break-through variants Waning immunity Reinfection Non-pharmaceutical interventions(NPIs) Vaccination rate

Polarization Insensitive Broadband Zero Indexed Nano-Meta Absorber for Optical Region Applications

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Computers, Materials & Continua 2022年第4期71卷 993-1009页

作者： Ismail hossain md Samsuzzaman Ahasanul Hoque Mohd Hafiz Baharuddin Norsuzlin Binti Mohd Sahar Mohammad Tariqul Islam Space Science Center(ANGKASA) Universiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Computer and Communication Engineering Faculty of Computer Science and EngineeringPatuakhali Science and Technology UniversityDumki8602PatuakhaliBangladesh Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia

Broadband response metamaterial absorber(MMA)remains a challenge among researchers.A nanostructured new zero-indexed metamaterial(ZIM)absorber is presented in this study,constructed with a hexagonal shape resonator for optical region *** design consists of a resonator and dielectric layers made with tungsten and quartz(Fused).The proposed absorbent exhibits average absorption of more than 0.8972(89.72%)within the visible wavelength of 450–600 nm and nearly perfect absorption of 0.99(99%)at 461.61 *** on computational analysis,the proposed absorber can be characterized as *** developments of ZIM absorbers have demonstrated plasmonic resonance characteristics and a perfect impedance *** incidence obliquity in typically the range of 0◦–90◦both in TE and TM mode with maximum absorbance is more than 0.8972(∼89.72%),and up to 45◦angular stability is suitable for solar cell applications,like exploiting solar *** proposed structure prototype is designed and simulated by studying microwave technology numerical computer simulation(CST)*** finite integration technique(FIT)based simulator CST and finite element method(FEM)based simulator HFSS also helps validate the numerical data of the proposed ZIM *** proposed MMA design is appropriate for substantial absorption,wide-angle stability,absolute invisible layers,magnetic resonance imaging(MRI),color images,and thermal imaging applications.

关键词： Hexagonal resonator loaded star shaped polarization insensitive compact broadband metamaterial absorber optical region applications

Tree species diversity in relation to environmental variables and disturbance gradients in a northeastern forest in Bangladesh

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Journal of Forestry Research 2019年第6期30卷 2143-2150页

作者： md Anwar hossain Muha Abdullah Al Pavel Kazuhiro Harada Carl Beierkuhnlein Anke Jentsch Mohammad Belal Uddin Bangladesh Bank(Central Bank of Bangladesh) Khulna 9100Bangladesh Forest Research Centre(CEF) School of Agriculture(ISA)University of LisbonTapada da Ajuda1349-017 LisbonPortugal Graduate School of Bioagricultural Sciences Nagoya UniversityNagoya 464-8601Japan Department of Biogeography University of Bayreuth95447 BayreuthGermany Department of Disturbance Ecology University of Bayreuth95447 BayreuthGermany Department of Forestry and Environment Science School of Agriculture and Mineral SciencesShahjalal University of Science and TechnologySylhet 3114Bangladesh

Biodiversity has become an issue of global attention because of growing awareness of its importance and its rapid depletion *** of tree species in relation to environmental and disturbance gradients was examined in three managed *** were randomly sampled in a survey of 75 circular plots(radius=13 m)with 5 subplots(radius=1 m).Generalized linear model analysis was used with a Poisson distribution log link function to understand the effects of variables(organic matter,organic carbon,nitrogen,potassium,pH,elevation and disturbance)on tree species *** correspondence analysis was used to explore ecological relationships among *** result found that the stand characteristics was an important influencing factor in the three *** result showed that the variables had a highly positive influence on tree species richness in the three *** ordination,the selected variables governed the richness of tree *** study can help identify the most important factors that drive tree species richness in the three managed forests in Bangladesh and in similar ecosystems and inform forest management decisions for conservation according to ecological importance.

关键词： Richness Disturbance Forest conservation Lawachara National Park Reserve forest

Potential bioactive phytochemicals, antioxidant properties and anticancer pathways of Nymphaea nouchali

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Asian Pacific Journal of Tropical Biomedicine 2020年第12期10卷 555-562页

作者： md.Nazim Uddin md.Abdus Samad md.Abu Zubair md.Zahurul Haque Kanika Mitra Tanzir Ahmed Khan md.Amir hossain Ashikujaman Syed Aklima Afroze Institute of Food Science and Technology Bangladesh Council of Scientific and Industrial ResearchDhaka 1205Bangladesh School of Basic Medicine and Clinical Pharmacy China Pharmaceutical UniversityNanjingJiangsu 211198China Department of Food Technology and Nutritional Science Mawlana Bhashani Science and Technology UniversitySantoshTangail 1902Bangladesh Center for New Drug Safety Evaluation and Research China Pharmaceutical UniversityJiangsuNanjing 211198China School of Pharmacy Lanzhou UniversityLanzhou 730000China School of Pharmacy China Pharmaceutical UniversityNanjingJiangsu 211198China

Objective:To investigate bioactive phytochemicals and antioxidant activities of Nymphaea nouchali and to explore its anticancer pathways by a network pharmacology ***:Using a spectrophotometer and high-performance liquid chromatography-diode array detector(HPLC-DAD),we quantified bioactive phytochemicals in methanolic extract of Nymphaea nouchali *** extracts were investigated for in vitro antioxidant *** of these bioactive phytochemicals were predicted and anticancer-associated pathways were analyzed by a network pharmacology ***,we identified the predicted genes associated with cancer pathways and the hub genes in the protein-protein interaction network of predicted ***:Quantitative results indicated the total phenolics,total flavonoids,and total proanthocyanidins in the methanolic extract of Nymphaea nouchali ***-DAD analysis showed rutin(39.44 mg),catechin(39.20 mg),myricetin(30.77 mg),ellagic acid(11.05 mg),gallic acid(3.67 mg),vanillic acid(0.75 mg),rosmarinic acid(4.81 mg),p-coumaric acid(3.35 mg),and quercetin(0.90 mg)in 1 g of dry *** extract showed the radical scavenging activities of 2,2-diphenyl-1-picrylhydrazyl,2,2’-azinobis(3-ethylbenzothiazoline-6-sulfonic acid)and N,*** using network pharmacology,we predicted 130 target genes associated with cancer *** top hub genes(IL6,AKT1,EGFR,JUN,PTGS2,MAPK3,CASP3,and CXCL8)were also identified,which were associated with cancer pathways and interacted with bioactive phytochemicals of the methanolic extract of Nymphaea nouchali ***:Our study provides insights into the mechanism of anticancer activities of the methanolic extract of Nymphaea nouchali tuber.

关键词： Bioactive phytochemicals Anticancer pathways Malignancy Network pharmacology Nymphaea nouchali

Real-Time Control System Adopted to Energy Storage for Smart Grid Low Wind Applications:A Part of Distributed Renewables in Smart City

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Journal of Electronic Science and Technology 2021年第4期19卷 379-389页

作者： md Shahrukh Adnan Khan Yoong Choon Chang md Ashraful Kabir Muhammad Izuan Fahmi Bin Romli Chockalingam Aravind Vaithilingam jakir Hosain with the Department of Electrical and Electronic Engineering Canadian University of BangladeshDhaka 1212 with the Department of Electrical&Electronic Engineering Universiti Tunku Abdul RahmanKamper 31900 with the Department of Computer Science&Engineering Canadian University of BangladeshDhaka 31900 with the Department of Electrical and Electronic Engineering University Malaysia PerlisPerlis 01000 with the Department of Electrical and Electronic Engineering Taylor’s UniversityKuala Lumpur 47500 with the School of Science&Engineering Canadian University of BangladeshDhaka 1212

In this paper,extensive efforts have been undertaken to design and develop a control system,which is incorporated with an energy storage device that can store energy from low-voltage renewable *** developed device acts as a storage element,which can be used to charge small-scale batteries,cellular devices,and other applications in remote places where the grid connection is not *** circuit is developed using a case-by-case *** order to solve the low output voltage problem,a bipolar junction transistor-metal oxide semiconductor field-effect transistor(BJT-MOSFET)based switch control technology with the Arduino microcontroller has been *** developed control system is extremely efficient in charging batteries through a supercapacitor for low-voltage *** this research,a small-scale 200-W portable vertical axis wind turbine is used at a wind speed of 3 m/*** result shows the efficiency of the proposed system as compared with the conventional *** proposed system can be an important tool of the latest distributed energy generation technology which is an important part of a smart ***,the limitations and future scopes of the development of the control device are discussed for the future *** important future scope identified is to integrate the Internet of Things based mobile interface for remote monitoring for any kind of pandemic situation like ***,it is high time to get our smart city concept aligned with the post COVID pandemic situation and get us prepared smartly for similar future occurrences.

关键词： Energy storage low-voltage application novel control system post pandemic smart city

Hydrogeochemical evaluation and statistical analysis of groundwater of Sylhet, north-eastern Bangladesh

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Acta Geochimica 2019年第3期38卷 440-455页

作者： Nasir Ahmed md.Bodrud-Doza S.M.Didar-Ul Islam Manzoor Ahmad Choudhry md.Iftakharul Muhib Anwar Zahid Shahadat hossain md.Moniruzzaman Nipa Deb md.Abdul Quaiyum Bhuiyan Isotope Hydrology Division Institute of Nuclear Science and Technology Atomic Energy Research Establishment Department of Environmental Sciences Jahangirnagar University Isotope Hydrology Section Department of Nuclear Sciences and Applications International Atomic Energy Agency Groundwater Hydrology Bangladesh Water Development Board

To investigate the hydrogeochemical characteristics of groundwater 23 shallow, 30 intermediate and 38 deep wells samples were collected from Sylhet district of Bangladesh, and analyzed for temperature, pH, Eh, EC,DO, DOC, Na^+, K^+, Ca^(2+), Mg^(2+), Cl^-, SO_4^(2-), NO_3^-,HCO_3^-, SiO_2^-, Fe, Mn and As. Besides, 12 surface water samples from Surma and Kushiyara Rivers were also collected and analyzed to understand the influence into aquifers. Results revealed that, most of the groundwater samples are acidic in nature, and Na–HCO_3 is the dominant groundwater type. The mean value of temperature, EC,Na^+, K^+, Ca^(2+), Mg^(2+), Cl^-, NO_3^- and SO_4^(2-) were found within the range of permissible limits, while most of the samples exceeds the allowable limits of Fe, Mn and As concentrations. However, relatively higher concentration of Fe and Mn were found in deep water samples and reverse trend was found in case of As. The mean concentrations of As in shallow, intermediate and deep wells were 39.3, 25.3and 21.4 lg/L respectively, which varied from 0.03 to148 lg/L. From spatial distribution, it was found that Fe,Mn and As concentrations are high but patchy in northern,north-western, and south-western part of Sylhet region. The most influential geochemical process in study area were identified as silicate weathering, characterized by active cation exchange process and carbonate weathering, which thereby can enhance the elemental concentrations in groundwater. Pearson's correlation matrix, principal component analysis and cluster analysis were also employed to evaluate the controlling factors, and it was found that, both natural and anthropogenic sources were influencing the groundwater chemistry of the aquifers. However, surface water has no significant role to contaminate the aquifers,rather geogenic factors affecting the trace elemental contamination. Thus it is expected that, outcomes of this study will provide useful insights for future groundwater monitoring and

关键词： Arsenic Groundwater Hydrogeochemistry Multivariate statistics Spatial distribution