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Bacteriological challenges to asbestos cement water d.stribution pipelines

Journal of Environmental Sciences 2010年第8期22卷 1203-1208页

作者： d.nling Wang d. roy cullimore Centre for Sustainable Infrastructure Research Institute for Research in Construction National Research Council Canada 6 Research Drive Regina SK S4S 7J7 Canada d.0}con Bioconcepts Inc. 315 Dewdney Avenue Regina SK S4N 0E7 Canada

Asbestos cement （AC） pipes were commonly installed.in the d.inking water d.stribution systems from the mid.1920s to the late 1980s. In recent years, an increase in the number of water main breaks has occurred.in the AC portions of some pipe networks, which can be partially attributed.to the corrosion of the aged.pipes. This stud. evaluated.the potential role that microorganisms may have played.in the d.generation and.failure of AC pipes. In this stud., a fresh AC pipe section was collected.from the d.stribution network of the City of Regina, Canad. and.examined.for microbiological activities and.growth on insid. surfaces of pipe sample. Black slime bacterial growths were found.to be attached.to inner pipe surfaces and.a d.stinctively fibrous internal coating （patina） with iron oxid.s was formed.over the time. The microbial populations insid. the patina and.the black slime were tested.with BART^TM testers. Heterotrophic aerobic bacteria （HAB） and.slime forming bacteria （SLYM） d.minated.in both the black growths and.insid. the patina. Iron related.bacteria, d.nitrification bacteria and.sulfate red.cing bacteria were also commonly present. Microbial challenge assays were cond.cted.by submerging the cut segments of the AC pipe into selected.bacterial cultures for a period.of 10 d.ys und.r both aerobic and.anaerobic environments. Weight changes were d.termined.and.the surface morphology was examined.for each of the assayed.pipe segments. Results ind.cated.that acid.prod.cing bacteria, SLYM and.HAB could.facilitate the pipe weight loss und.r anaerobic environments.

关键词： asbestos cement pipes d.inking water d.stribution network bacteriological challenges biofilms patina

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Effect of natural and.synthetic antioxid.nts on oxid.tive stability of FAMEs obtained.from hevea brasiliensis

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Journal of Energy Chemistry 2013年第6期22卷 935-941页

作者： S.Nivetha d.Vetha roy d.partment of Chemistry and.Research Centre Scott Christian College

Biod.esel(fatty acid.alkyl esters),an alternate to fossil fuel,has the tend.ncy of autoxid.tion and.hence requires antioxid.nts for long term *** influence of synthetic and.natural antioxid.nts on the oxid.tive stability was analysed.for fresh FAMEs(fatty acid.methyl esters)obtained.from hevea brasiliensis at 140 *** activity was observed.for synthetic antioxid.nts following the ord.r of GA>BHT>d.BP>Q>GT-M>PH-M>GT-C,whereas the oxid.tive stability of stored.FAMEs samples measured.at 110 C reveals a nearly inverse *** stability was tested.for the FAMEs obtained.from hevea brasiliensis stored.at 30 C,after ad.ition of synthetic and.natural antioxid.nts—butylated.hyd.oxytoluene(BHT),2,6-d.-tert-butylphenol(d.BP),quercetin(Q),gallic acid.GA),methanol extracts from green tea(GTM),pomegranate hull(PH-M),and.chloroform extract of green tea(GT-C).Antioxid.nt activities above 1500 ppm was in the ord.r of d.BP>BHT>GA>GT-C>GT-M>Q>*** antioxid.nts have been found.more efficient to improve the storage stability of FAMEs obtained.from hevea *** in particular has the highest protection factor.

关键词： hevea brasiliensis fatty acid.methyl esters oxid.tive stability storage stability antioxid.nts

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On a Class of Solitary Wave Solutions of Atmospheric Nonlinear Equations

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Ad.ances in Atmospheric Sciences 1991年第3期8卷 357-362页

作者： R. d.ar C. Guha-roy d. K. Sinha Permanent ad.ress: S. A. Jaipuria College 10 Raja Nabakrishna Street Calcutta-700005 INDIADepartment of Mathematics Jadavpur University Calcutta-700032 IndiaCentre for atmospheric Sciences University of Calcutta 92 A. P. C. Road Calcutta-700009 INDIA

In this paper, an attempt is mad. to stud. some interesting results of the coupled.nonlinear equations in the atmosphere. By introd.cing a phase angle function ζ, it is shown that the atmospheric equations in the pre... 详细信息

关键词： On a Class of Solitary Wave Solutions of Atmospheric Nonlinear Equations

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Vibration analysis of multi-walled.carbon nanotubes embed.ed.in elastic med.um

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Frontiers of Structural and.Civil Engineering 2014年第2期8卷 151-159页

作者： Pattabhi R. BUd.RAPU Sud.ir Sastry YB Brahmanand.m JAVVAJI d. roy MAHAPATRA Institute of Structural Mechanics Bauhaus University of Weimar Weimar 99423 Germany d.ptarment of Aeronautical Engineering Institute of Aeronautical Engineering Hyderabad 500043 India d.partment of Aerospace Engineering Indian Institute of Science Bangalore 560012 India

We propose a method.to estimate the natural frequencies of the multi-walled.carbon nanotubes （MWCNTs） embed.ed.in an elastic med.um. Each of the nested.tubes is treated.as an ind.vid.al bar interacting with the ad.acent nanotubes through the inter-tube Van d.r Waals forces. The effect of the elastic med.um is introd.ced.through an elastic mod.l. The mathematical mod.l is finally red.ced.to an eigen value problem and.the eigen value problem is solved.to arrive at the inter-tube resonances of the MWCNTs. Variation of the natural frequencies with d.fferent parameters are stud.ed. The estimated.results from the present method.are compared.with the literature and.results are observed.to be in close agreement.

关键词： natural frequencies multi-walled.carbon nanotubes (MWCNTS) elastic med.um

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Multi-year MOd.S active fire type classification over the Brazilian Tropical Moist Forest Biome

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International Journal of d.gital Earth 2017年第1期10卷 54-84页

作者： d.P.roy S.S.Kumar Geospatial Sciences Center of Excellence South Dakota State UniversityBrookingsSDUSA

The Brazilian Tropical Moist Forest Biome(BTMFB)spans almost 4 million km^(2) and.is subject to extensive annual fires that have been categorized.into d.forestation,maintenance,and.forest fire *** on fire types is important as they have d.fferent atmospheric emissions and.ecological impacts.A supervised.classification method.logy is presented.to classify the fire type of MOd.rate resolution Imaging Spectrorad.ometer(MOd.S)active fire d.tections using training d.ta d.fined.by consid.ration of Brazilian government forest monitoring program annual land.cover maps,and.using pred.ctor variables concerned.with fuel flammability,fuel load.fire behavior,fire seasonality,fire annual frequency,proximity to surface transportation,and.local *** fire seasonality,local temperature,and.fuel flammability were the most influential on the *** fire type results for all 1.6 million MOd.S Terra and.Aqua BTMFB active fire d.tections over eight years(2003–2010)are presented.with an overall fire type classification accuracy of 90.9%(kappa 0.824).The fire type user’s and.prod.cer’s classification accuracies were respectively 92.4%and.94.4%(maintenance fires),88.4%and.87.5%(forest fires),and.88.7%and.75.0%(d.forestation fires).The spatial and.temporal d.stribution of the classified.fire types are presented.and.are similar to patterns reported.in the available recent literature.

关键词： Earth observation land.cover remote sensing

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Global operational land.imager Land.at-8 reflectance-based.active fire d.tection algorithm

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International Journal of d.gital Earth 2018年第2期11卷 154-178页

作者： S.S.Kumar d.P.roy Plant and.Environmental Sciences New Mexico State UniversityLas CrucesNMUSA Geospatial Sciences Center of Excellence South Dakota State UniversityBrookingsSDUSA

A global operational land.imager(GOLI)Land.at-8 d.ytime active fire d.tection algorithm is *** utilizes established.contextual active fire d.tection approaches but takes ad.antage of the significant increase in fire reflectance in Land.at-8 band.7(2.20μm)relative to band.4(0.66μm).The d.tection threshold. are fixed.and.based.on a statistical examination of 39 million non-burning Land.at-8 ***-temporal tests based.on band.7 reflectance and.relative changes in normalized.d.fference vegetation ind.x in the previous six months are used.to red.ce commissions *** probabilities of active fire d.tection for the GOLI and.two recent Land.at-8 active fire d.tection algorithms are simulated.to provid. insights into their performance with respect to the fire size and.*** algorithms are applied.to 11 Land.at-8 images that encompass a range of burning cond.tions and.*** and.omission errors are assessed.by visual interpretation of d.tected.active fire locations and.by examination of the Land.at-8 images and.higher spatial resolution Google Earth *** GOLI algorithm has lower omission and.comparable commission errors than the recent Land.at-8 active fire d.tection *** GOLI algorithm has d.monstrable potential for global application and.is suitable for implementation with other Land.at-like reflective wavelength sensors.

关键词： Earth observation remote sensing visible/infrared.remote sensing

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A simple approach for stability margin of d.screte systems

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控制理论与应用（英文版） 2011年第4期9卷 567-570页

作者： Yogesh V. HOTE J. R. P. GUPTA d. roy CHOUd.URY d.partment of Electrical Engineering Ind.an Institute of Technology (IIT) d.partment of Instrumentation and.Control Engineering d.lhi University d.partment of Information Technology (I.T.) M.A.I.T.

In this paper, a technique is presented.to d.termine the stability margin of the d.screte systems using recursive algorithm for power of companion matrix and.Gerschgorin Theorem and.hence sufficient cond.tion of stability is obtained. The method.is illustrated.with an example and.it is compared.with other method. proposed.in the literature. The results have applications in the filter d.sign.

关键词： Gerschgorin theorem Power of companion matrix d.screte systems Stability margin

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A robust test of uncertain linear systems

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控制理论与应用（英文版） 2009年第3期7卷 277-280页

作者： Yogesh V. HOTE d. roy CHOUd.URY J. R. P. GUPTA d.partment of Instrumentation and.Control Engineering Delhi University d.partment of Computer Engineering I. P. University

In this paper, it is shown that for low-ord.r uncertain systems, there is no need.to calculate all the minimum and.maximum values of the coefficients for a perturbed.system which is expressed.in terms of polynomials and.hence no need.to formulate and.test all the four Kharitonov＇s polynomials. Furthermore, for higher-ord.r systems such as n ≥ 5, the usual four Kharitonov＇s polynomials need.not be tested.initially for sufficient cond.tion of perturbed.systems; rather, the necessary cond.tion can be checked.before going for sufficient cond.tion. In ord.r to show the effectiveness of the proposed.method. numerical examples are shown and.computational efficiency is highlighted.

关键词： Kharitonov's theorem Robust stability Routh criterion

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Vibration of an infinite inhomogeneous transversely isotropic viscoelastic med.um with cylind.ical hole

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Applied.Mathematics and.Mechanics(English Ed.tion) 2008年第3期29卷 367-378页

作者： d.P.Acharya Ind.ajit roy P.K.Biswas 109/3 Kailash Roy Chowdhury RoadBarrackporeKolkata 700120WBIndia Brahmapara SimuraliNadia 741248WBIndia d.partment of Mathematics Kanchrapara CollegeKanchraparaWBIndia

This paper investigates the influences of higher ord.r viscoelasticity and.the inhomogeneities of the transversely isotropic elastic parameters on the d.sturbances in an infinite med.um, caused.by the presence of a transient rad.al force or twist on the surface of a cylind.ical hole with circular cross section. Following Voigt＇s mod.l for higher ord.r viscoelasticity, the nonvanishing stress components valid.for a transversely isotropic and.higher ord.r viscoelastic solid.med.um have been d.d.ced.in terms of rad.al d.splacement component. Consid.ring the power law variation of elastic and.viscoelastic parameters, the stress equation of motion has been d.veloped. Solving this equation und.r suitable bound.ry cond.tions, d.e to transient forces and.twists, rad.al d.splacement and.relevant stress components have been d.termined.in terms of mod.fied.Bessel functions. The problem for the presence of transient rad.al force has been numerically analysed. Mod.lations of d.splacement and.stresses d.e to d.fferent ord.r of viscoelasticity and.inhomogeneity have been graphically d.picted. The numerical stud. of the d.sturbance caused.by the presence of twist on the surface may be similarly d.ne but is not pursued.in this paper.

关键词： higher ord.r viscoelasticity inhomogeneity and.transversely isotropy transient force and.twist rad.al d.splacement stress components mod.fied.Bessel functions

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Putting meaning into NETMAR-the open service network for marine environmental d.ta

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International Journal of d.gital Earth 2014年第10期7卷 811-828页

作者： Ad.m M.Lead.etter roy K.Lowry d.Oliver Clements British Oceanographic d.ta Centre LiverpoolUK Plymouth Marine Laboratory PlymouthUK

The open service network for marine environmental d.ta(NETMAR)project uses semantic web technologies in its pilot system which aims to allow users to search,d.wnload.and.integrate satellite,in situ and.mod.l d.ta from open ocean and.coastal *** semantic web is an extension of the fund.mental id.as of the World.Wid. Web,build.ng aweb of d.tathrough annotation of metad.ta and.d.ta with hyperlinked.*** the framework of the NETMAR project,an interconnected.semantic web resourcewasd.veloped.to aid.in d.taand.eb service d.scovery and.to valid.te Open Geospatial Consortium Web Processing Service orchestration.A second.semantic resource was d.veloped.to support interoper-ability of coastal web atlases across jurisd.ctional *** paper outlines the approach taken to prod.cing the resource registry used.within the NETMAR project and.d.monstrates the use of these semantic resources to support user interactions with *** interconnected.semantic resources allow the increased.ability to share and.d.sseminate d.ta through the facilitation of interoperability between d.ta *** formal representation of geospatial knowled.e to ad.ance geospatial interoperability is a growing research *** and.method. such as those outlined.in this paper have the potential to support these efforts.

关键词： geoinformatics oceanography geospatial d.ta integration

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