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Seasonal influence of freshwater discharge on spatio-temporal variations in primary productivity, sea surface temperature, and euphotic zone depth in the northern Bay of Bengal

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ACTA OCEANOLOGICA SINICA 2024年第6期43卷 1-14页

作者： Ahmad, Hafez Jose, Felix Bhuyan, md. Simul islam, md. nazrul Dash, Padmanava mississippi State Univ Geosyst Res Inst Dept Geosci Starkville MS 39759 USA Univ Chittagong Dept Oceanog Chittagong 4331 Bangladesh Florida Gulf Coast Univ Dept Marine & Earth Sci Ft Myers FL 33965 USA Bangladesh Oceanog Res Inst Coxs Bazar 4730 Bangladesh Univ Chittagong Inst Marine Sci Fac Marine Sci & Fisheries Chittagong 4331 Bangladesh Jahangirnagar Univ Dept Geog & Environm Dhaka 1342 Bangladesh mississippi State Univ Dept Geosci Starkville MS 39759 USA

Ocean productivity is the foundation of marine food web, which continuously removes atmospheric carbon dioxide and supports life at sea and on land. Spatio-temporal variability of net primary productivity (NPP), sea surface temperature (SST), sea surface salinity (SSS), mixed layer depth (mLD), and euphotic zone depth (EZD) in the northern Bay of Bengal (BoB) during three monsoon seasons were examined in this study based on remote sensing data for the period 2005 to 2020. To compare the NPP distribution between the coastal zones and open BoB, the study area was divided into five zones (Z1-Z5). Results suggest that most productive zones Z2 and Z1 are located at the head bay area and are directly influenced by freshwater discharge together with riverine sediment and nutrient loads. Across Z1-Z5, the NPP ranges from 5 315.38 mg/(m(2)middle dot>d) to 346.7 mg/(m(2)middle dot>d) (carbon, since then the same). The highest monthly average NPP of 5 315.38 mg/(m(2)middle dot>d) in February and 5 039.36 mg/(m(2)middle dot>d) in June were observed from Z2, while the lowest monthly average of 346.72 mg/(m(2)middle dot>d) was observed in march from Z4, which is an oceanic zone. EZD values vary from 6-154 m for the study area, and it has an inverse correlation with NPP concentration. EZD is deeper during the summer season and shallower during the wintertime, with a corresponding increase in productivity. Throughout the year, monthly SST shows slight fluctuation for the entire study area, and statistical analysis shows a significant correlation among NPP, and EZD, overall positive between NPP and mLD, whereas no significant correlation among SSS, and SST for the northern BoB. Long-term trends in SST and productivity were significantly positive in head bay zones but negatively productive in the open ocean. The findings in this study on the distribution of NPP, SST, SSS, mLD, and EZD and their seasonal variability in five different zones of BoB can be used to further improve th

关键词： chlorophyll a sea surface temperature euphotic zone depth primary productivity Ganges-Brahmaputra ocean color Bay of Bengal monsoon INDIAN-OCEAN mEDITERRANEAN SEA PHYTOPLANkTON mODEL CIRCULATION SImULATION ABUNDANCE TRENDS

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Seedling Growth of Cassia tora, Cassia occidentalis and Cassia sophera in Relation to Salinity and pH

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Journal of Agricultural Science and Technology(A) 2015年第7期5卷 601-607页

作者： Sabiha Sultana a.k.m. nazrul islam Ecology and Environment Laboratory Department of Botany University of Dhaka Dhaka 1000 Bangladesh

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Geochemical and mineralogical evaluations of coal,shale,and mine waste overburden from makum coalfield of the Northeast India

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International Journal of Coal Science & Technology 2023年第3期10卷 41-57页

作者： Nilotpol Bhuyan nazrul islam monikankana Saikia James CHower Binoy k.Saikia Coal and Energy Division CSIR-North East Institute of Science and TechnologyJorhatAssam 785006India Academy of Scientific and Innovative Research(AcSIR) Ghaziabad 201002India Center for Applied Energy Research University of Kentucky2540 Research Park DriveLexingtonKY 40511USA

The Cenozoic-age makum coal from northeastern India offers numerous research opportunities because of its diverse geochemical and geological *** to its high sulfur content,the coal has been found to be less useful for industrial *** can,however,serve as a hub for ongoing research on coal-based derivative *** aim of this research work is to investigate the mineralogical and geochemical compositions of the coal,mine overburden(mOB)and shale samples taken from the makum coal field and also on establishing a mutual relationship between *** characterize the geochemical controlling factors of the makum coal field,the study employs coal petrography,FTIR,mineralogical,and geochemical *** to X-ray diffraction analysis,the major minerals like quartz,kaolinite,haematite,illite,pyrite,and calcite are present in coal and *** is observed by SEm-EDS analysis as cubic-shaped particles that are smaller than a fewμm in *** presence of sulfide minerals represents a phase of pyrite *** petrography study was used to better understand the environment that existed during the formation of the plant material,which aids us in determining the quantity of detrital mineral sediment contained in the *** to the ICP-mS analysis,the samples indicate significant levels of rare earth elements including *** present study reveals higher concentrations of poten-tial hazardous elements in the coal samples,with V,Cr,Ni,Cu,and Zn content in coal being considerably enriched compared to world-average *** correlation analysis reveals that the potential hazardous elements like Co,Ni,As,and Cu are associated with pyrite as they have strong affinity towards ***,numerous minerals and rare earth elements(REEs)exist,opening up a fresh avenue for more research in the *** study also assists researchers in understanding the significance of makum coal and provides numerous ideas for coal charac

关键词： Coal geology mine waste overburden(mOB) Petrology Rare earth elements(REEs) Potentially hazardous elements(PHEs)

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Source identification, contamination status and health risk assessment of heavy metals from road dusts in Dhaka, Bangladesh

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Journal of Environmental Sciences 2022年第11期34卷 159-174页

作者： Aklima Nargis Ahsan Habib md nazrul islam kai Chen md Shafiqul islam Sarker A N m Al-Razee Wenbin Liu Guorui Liu minggang Cai Coastal and Ocean management Institute&State key laboratory of marine Environmental Science Xiamen UniversityXiamen 361005China Department of Chemistry University of DhakaDhaka 1000Bangladesh Central Chemical Laboratory Department of Narcotics ControlMinistry of Home AffairsDhaka 1204Bangladesh Department of Analytical Chemistry&Environmental Science Training Institute for Chemical IndustriesPolashNarsingdi 1611Bangladesh State key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

In this study, concentrations of Cr, mn, Ni, Cu, Zn, Cd and Pb were determined in road dusts collected from different locations in Dhaka to assess source, contamination status and health risk. Energy-dispersive X-ray fluorescence spectroscopy and energy-dispersive X-ray spectroscopy were used to determine Cr, mn, Ni, Cu, Zn, Cd and Pb and their mean concentrations were 162.27 ± 29.46, 721.18 ± 180.14, 35.65 ± 12.55, 104.56 ± 128.33, 515.32 ± 321.90,BDL, and 342.82 ± 591.20 mg/kg, respectively. Among the heavy metals, highest concentrations of Cu, Zn and Pb were found at urban sites-7(municipal waste dumping) and 8(medical waste incineration). Highest concentration of Cr followed by Cu and Zn was found at site-5(Tejgaon, urban). Principal component analysis revealed that anthropogenic activities are the potential sources for Cr, Ni, Cu, Zn and Pb while earth crust for mn. Pollution index and pollution load index results suggested that all the sites were contaminated and/or degraded by Cr, Cu, Zn and Pb except sites-9(urban), 10(sub-urban), 11(rural) while sites-7 and 8(urban) were extremely degraded. For noncarcinogenic health risk, hazard quotient values for dermal were higher compared to that of inhalation/ingestion. Though hazard index values were less than 1 at all the sites, these were at least one order of magnitude higher for children group than that of adult group, thus the children group may face more noncarcinogenic health risk at sites -7 and 8. Values of incremental lifetime cancer risk were from 10to 10showed no carcinogenic health risk by road dusts contaminated with the heavy metals.

关键词： Heavy metal Road dust Dhaka Principal component analysis Pollution status Health risk assessment

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Blue carbon sequestration following mangrove restoration:evidence from a carbon neutral case in China

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Ecosystem Health and Sustainability 2022年第1期8卷 471-485页

作者： Sourav Bagchi Ratul Xiaoxuan Gu Peiyang Qiao Febrina Wulanda Sagala Shu Nan nazrul islam Luzhen Chen State key Laboratory of marine Environmental Science Key Laboratory of the Ministry of Education for Coastal and Wetland EcosystemsCollege of the Environment and EcologyXiamen UniversityXiamenFujianChina Forestry and Wood Technology Discipline Khulna UniversityKhulnaBangladesh

Sequestration of blue carbon(C)in mangrove plantations depends on site characteristics and plantation *** study evaluated the effects of plantation management on C sequestration at a C-neutral site in Xiamen,China.A field study was conducted on 10-year-old Sonneratia apetala and kandelia obovata plantations(mono-Sa,mono-ko)and a 15-year-old mixed plantation-.We found that mono-ko had a significantly higher ecosystem C sequestration rate(3.32±0.62 kg C m^(-2)yr^(-1))than others when planted in the indirect shade of pioneer *** a non-native species,Sonneratia performed better(0.57±0.01 kg C m^(-2)yr^(-1))when planted with kandelia than in monotypic *** temporary and long-term certified emission reduction(tCER and lCER)of the 12.98 ha mono-ko was 4103.89 and 3693.50 net CO_(2)-e within 10 years,respectively.A literature review was conducted to show the compatibility of this study with other natural and plantation sites of China and Bangladesh(the native habitat for Sonneratia).The C sequestration of Sonneratia plantation sites in China is comparable with those in ***,the soil C accumulation rate for a Sonneratia monotypic plantation in Bangladesh decreased with age,yet the same did not occur in the plantations of China.

关键词： Blue carbon mangrove carbon density carbon accumulation plantation type

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modeling and Performance Analysis of Spiral Fishbone Network Using NS-2

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Journal of Computer and Communications 2022年第3期10卷 125-140页

作者： Pronab Biswas md maruf islam Sayed Asaduzzaman nazrul islam m. Raihan Department of Software Engineering Daffodil International University Dhaka Bangladesh Department of Information and Communication Technology Mawlana Bhashani Science and Technology University Tangail Bangladesh Department of Computer Science and Engineering North Western University Khulna Bangladesh

In this research, we have projected and carried out a novel fishbone network that shows better performance in the term of minimizing the packet delay with respect to sink speed. Previous study implies that sector angle affects greatly on designing fishbone network. Finite Set of nodes arranges to sense the physical condition of any system is called wireless sensor. Our designed fishbone network can be potentially applied for a wireless sensing system to formulate a whole network. The network is a novel design which has been finalized by comparing sector angle. Analysis takes place by varying packet delay according to sink speed. Future analysis takes place for Quality of Service (QoS) and Quality of Experience (QoE). Latency of Packet and its size is the measurement criteria of any network or service is called Quality of Service (QoS). On the other hand the user experience of using the designed network is called Quality of Experience (QoE). Our designed network has been analyzed in TCP Tracer to find out the latency or packet delay for different users. The user data has been shorted and equated among them for latency with different no of packets. Our proposed spiral fishbone network shows better QoS and QoE. In future more nodes can be added to design extended fishbone network for wireless.

关键词： Fishbone Network Network modelling Performance Analysis NS-2

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Evaluation and comparison of CmIP6 models and mERRA-2 reanalysis AOD against Satellite observations from 2000 to 2014 over China

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Geoscience Frontiers 2022年第2期13卷 165-185页

作者： md.Arfan Ali muhammad Bilal Yu Wang Zhongfeng Qiu Janet E.Nichol Gerrit de Leeuw Song ke Alaa m.hawish mansour Almazroui Usman mazhar Birhanu Asmerom Habtemicheal m.nazrul islam Lab of Environmental Remote Sensing(LERS) School of Marine SciencesNanjing University of Information Science and TechnologyNanjing 210044China Department of Geography School of Global StudiesUniversity of SussexBrighton BN19RHUK Royal Netherlands meteorological Institute(kNmI) R&D Satellite Observations3730AE De BiltThe Netherlands School of Atmospheric Physics Nanjing University of Information Science and TechnologyNanjing 210044China Aerospace Information Research Institute Chinese Academy of Sciences(AirCAS)No.20 Datun RoadChaoyang DistrictBeijing 100101China School of Environment Science and Spatial Informatics University of Mining and TechnologyXuzhouJiangsu 221116China Geological Survey of Jiangsu Province Nanjing 210018China Center of Excellence for Climate Change Research/Department of meteorology King Abdulaziz UniversityJeddah 21589Saudi Arabia Climatic Research Unit School of Environmental SciencesUniversity of East AngliaNorwichUK School of Remote Sensing and Geomatics Engineering Nanjing University of Information Science and TechnologyNanjing 210044China Department of Physics Wollo UniversityDessie P.O.Box 1145Ethiopia

Rapid industrialization and urbanization along with a growing population are contributing significantly to air pollution in *** of long-term aerosol optical depth(AOD)data from models and reanalysis,can greatly promote understanding of spatiotemporal variations in air pollution in *** do this,AOD(550 nm)values from 2000 to 2014 were obtained from the Coupled model Intercomparison Project(CImP6),the second version of modern-Era Retrospective analysis for Research,and Applications(mERRA-2),and the moderate Resolution Imaging Spectroradiometer(mODIS;flying on the Terra satellite)combined Dark Target and Deep Blue(DTB)aerosol *** used the TerramODIS DTB AOD(hereafter mODIS DTB AOD)as a standard to evaluate CmIP6 Ensemble AOD(hereafter CmIP6 AOD)and mERRA-2 reanalysis AOD(hereafter mERRA-2 AOD).Results show better correlations and smaller errors between mERRA-2 and mODIS DTB AOD,than between CmIP6 and mODIS DTB AOD,in most regions of China,at both annual and seasonal ***,significant under-and over-estimations in the mERRA-2 and CmIP6 AOD were also observed relative to mODIS DTB *** long-term(2000-2014)mODIS DTB AOD distributions show the highest AOD over the North China Plain(0.71)followed by Central China(0.69),Yangtse River Delta(0.67),Sichuan Basin(0.64),and Pearl River Delta(0.54)*** lowest AOD values were recorded over the Tibetan Plateau(0.13±0.01)followed by Qinghai(0.19±0.03)and the Gobi Desert(0.21±0.03).Large amounts of sand and dust particles emitted from natural sources(the Taklamakan and Gobi Deserts)may result in higher AOD in spring compared to summer,autumn,and *** were also calculated for 2000-2005,for2006-2010(when China introduced strict air pollution control policies during the 11 th Five Year Plan or FYP),and for 2011-2014(during the 12 th FYP).An increasing trend in mODIS DTB AOD was observed throughout the country during *** uncontrolled industrialization,urbanization,and rapid eco

关键词： Aerosol Optical Depth Air pollution mERRA-2 mODIS Air quality

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Petrography and geochemistry of exported Colombian coals:Implications from correlation and regression analyses

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Energy Geoscience 2021年第3期2卷 201-210页

作者： Segun A.Akinyemi Ferney Bohorquez nazrul islam Binoy k.Saikia Carlos H.Sampaio Tito J.Crissien Luis F.O.Silva Environmental Remediation&Geopollution Group Department of GeologyFaculty of ScienceEkiti State University Ado EkitiP.M.B.5363Ado EkitiNigeria Department of Civil and Environmental Engineering Universidad de La CostaCalle 58#55-66.080002BarranquillaAtlanticoColombia Coal and Energy Group Materials Science&Technology DivisionCSIR-North East Institute of Science&TechnologyJorhat785006India Departament D’Enginyeriaminera Industrial I TICSerra Húnter ProfUniversitatPolitecnica de Catalunya Barcelona TechAv.Bases de Manresa 61e63Manresa08242BarcelonaSpain

The petrology of coal,as determined by the microscopic analysis of organic and inorganic elemental constituents of coal,provides information on its nature and *** is used worldwide in the production of thermal energy and *** the case of high-quality Colombian coals,only limited studies have been carried *** present study presents the geochemical,mineralogical,and petrological characteristics of coal samples collected from Puerto Drummond in Cienaga,Colombia,to predict their potential ***,the ultimate,proximate,petrographic,gross calorific value(GCV),ash fusion temperature,Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),X-ray fluorescence(XRF),and Thermogravimetric(TG)analyses were employed in this *** petrological analysis reveals that Colombian coals are naturally more abundant in vitrinite(72%)than inertinite(14e23%)*** and aluminosilicate are the main minerals present as fine particles mixed with *** XRD and FTIR analyses show that the most common and dominant minerals are quartz,while gypsum,hematite,calcite and mica occur in lesser *** oxide composition of the coal ashes consists of 51e58%SiO2 and 18e25%Al2O3 as determined by XRF *** correlation and regression analysis,the moisture content shows a reverse correlation with GCV(Regression value of R2¼0.68).This study helps researchers to comprehend the importance of Colombian coals and presents various techniques for characterisation of coals.

关键词： Coal characterisation Geochemistry mineralogy Coal petrology Colombia

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matrix-material Fabrication Technique and Thermogravimetric Analysis of Banana Fiber Reinforced Polypropylene Composites

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Journal of Building material Science 2023年第2期5卷 15-24页

作者： nazrul islam m.A Gafur Department of Basic Sciences Primeasia UniversityDhaka1213Bangladesh Pilot Plant and Process Development Centre(PP&PDC) Bangladesh Council of Scientific and Industrial Research(BCSIR)Dhaka1205Bangladesh

From the environmental consideration,it would be very interesting to use natural fibers such as banana,jute or coir as reinforcement materials instead of artificial fibers or any kind of synthetic *** fibers have many advantages over synthetic *** banana fiber composites(PPBC)are prepared using untreated and alkali-treated banana fibers at 10-25%by weight of the fiber *** thermal properties of polypropylene natural fiber composites are very important for technological *** measurements show that the incorporation of banana fiber into PP enhances the thermal stability of composites containing treated fibers,in comparison with untreated fibers.A composite of biodegradable polypropylene(PP)reinforced with short banana natural fibers was prepared by melt blending followed by a hot press molding *** thermal properties of matrix materials were studied using thermogravimetric analyzers TGA *** is observed that the introduction of short banana fibers slightly improved the thermo oxidative stability of PP-banana *** and chemical changes occurred through dehydration,phase transition,molecular orientation,crystallinity disruption,oxidation and decomposition,and incorporation of several functional *** investigations of the thermal behavior of polymers in gas,vacuum or inert atmosphere give the knowledge of how change takes place in *** understand such changes thermogravimetric analysis(TGA)and thermal analysis(TG)were *** is observed reinforcement of short banana fiber leads to little improvement in the thermooxidative stability of *** to the enhancement of thermo-mechanical properties,such composites may be used as building materials namely roof materials,selling materials and many other engineering applications.

关键词： Polypropylene banana composites(PPBC) Natural fiber Oxidative stability Thermogravimetric analysis(TGA) Decomposition

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In vivo anticancer activity of vanillin semicarbazone

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Asian Pacific Journal of Tropical Biomedicine 2012年第6期2卷 438-442页

作者： Shaikh m mohsin Ali m Abul kalam Azad mele Jesmin Shamim Ahsan m mijanur Rahman Jahan Ara khanam m nazrul islam Sha m Shahan Shahriar Department of Applied Chemistry and Chemical Engineering University of Rajshahi Department of Biochemistry and molecular Biology University of Rajshahi Department of Chemistry University of Chittagong Department of Food Science & Technology Chittagong Veterinary and Animal Science University

Objective:To evaluate the anticancer activity of vanillin semicarbazone(VSC) against Ehrlich ascites carcinoma(EAC) cells in Swiss albino ***:The compound VSC at three doses(5, 7.5 and 10 mg/kg i.p.) was administered into the intraperitoneal cavity of the EAC inoculated mice to observe its efficiency by studying the cell growth inhibition, reduction of tumour weight,enhancement of survival time as well as the changes in depleted hematological parameters. Allsuch parameters were also studied with a known standard drug bleomycin at the dose of 0.3 mg/kg(i.p.).Results:Among the doses studied, 10 mg/kg(i.p.) was found to be quite comparable in potency to that of bleomycin at the dose of 0.3 mg/kg(i.p.). The host toxic effects of VSC was found to be ***:It can be concluded that VSC can therefore be considered as potent anticancer agent.

关键词： Anticancer activity Ehrlich ascites carcinoma Schiffbase

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