Spectral absorption coefficient of phytoplankton and its relation to chlorophyll a and remote sensing reflectance in coastal waters of southern China

Thespectralabsorptioncoefficientof phyto plankton ,aph(λ) ,iscriticalforbio opticalmodels .Suchmodelsusingaph(λ) ,combinedwithremotelysenseddata ,havebeenrecentlyusedtointerpretthevariationsofoceancoloraswellastoproviderobustestimationofprimaryproductionatglobalorregionalscaleandthustoestimatecarbonfluxintheeuphoticlayer[1— 6 ] .Thechlorophyll specificabsorption ,a ph(λ) ,definedastheratioofphytoplanktonabsorp tioncoefficienttochlorophyllaconcentration ,waspreviouslyconsideredasaconstant,a…     

Synthesis, Crystal Structure and Spectrum Characterization of Schiff Base Isonicotinaldehyde Thiosemicarbazone

1 Introduction Heterocyclicthiosemicarbazonesand theirmental complexes have been extensivelyinvestigatedin the recent years, because many of them exhibit antibacteri,a lantivir,a lantitumour and antileukaemic activityin vitroand in vivo [1～3]. In particularthose derivedfrom 2-formyl [4,5] and 2-acetylpyridine[6], but a thiosemicarbazonemoiety attachedto the 3- and 4-position of the hetercyclichave receivedmuch less attention presumably due to a less ability for coordination. Mendes et al. [7]…     

A resonant miniature electric field sensor using bulk-micromachining process

Recentyears,increasingattentionhasbeenpaidtotheresearchoflow costandsmall sizedelectric fieldsensors(EFSs)[1,2]sincethereexistseveralap plicationsoftheirmacroscalecounterparts[3,4].Foryears,agrowingdevelopmentofmicromachining technologieshasbeenwitnessed,whichbroughtin significantimprovementinperformanceandfunction alityofvariousmicroelectromechanicalsystems(MEMS)devices[5,6].Inthispaper,weproposea methodofdesigningaminiatureEFS(MEFS)using six stepbulk micromachiningprocess.Advantagesofo…     

网恋像雾像雨又像风

尽管地球村越来越小,但大都市里人们与周围人的关系却日渐松散和疏离。而网络在一定程度上拉近了人们之间的距离,网恋更是让两个素不相识的人走到一起。网络为网民相识相恋创造机会,使交流变得更加自由和自然,为封闭的生活打开了另一扇窗户。     

Land cover classification of remotely sensed image with hierarchical iterative method

Land cover classification is one of the most wide ly used applications of remote sensing. The use ofmultitemporal remote sensing data in land cover clas sification is one of the effective methods of obtainingaccurate land cover/land use data. For a particularimage, different land cover types often show a similarspectral response and are difficult to separate. Theadvantage of using multitemporal data is that differentvegetation types show different spectral characteristicsin…     

利用现代教育技术,构建个性化大学英语教学模式

有关教学模式的改革,国内外学者有过或正在作各方面的探讨,但到目前为止还没有形成一个全面、系统、完整的新的教学模式.经过2004-2005年的教学研究,结果表明基于建构主义理论,应用现代教育技术提供的网络教学环境所构建的大学英语教学模式,有利于提高学生听说能力和促进学生的个性化学习,使学生综合能力得到全面发展.     

Synthesis and thermodynamic analysis of nano-La_2O_3

The thermodynamic parameters of La(NO_3)_3 and La(OH)_3 are evaluated and the thermodynamics of nano-La_2O_3 syn- thetic process is analyzed.On the base of thermodynamic analysis,La_2O_3 nano-powders are prepared by the sol-gel method and the experi- ment scheme is designed by an orthogonal method.The dry-gelatin is analyzed with differential thermal analysis/thermo-gravimetric analy- sis(TGA-DTA)and X-ray diffraction method.The microstructure of nano-La_2O_3 powders is observed by transmission dectron micro- scope.The synthetic parameters affecting the average grain size and dispersivity of nano-La_2O_3 particles are experimentally examined and analyzed.All the results indicate that nano-La_2O_3 particles well-dispersed are obtained and the average grain size is in the range of 20—50 nm.     

关于数列极限超越性的一个注记

利用对代数数序列的极限超越性的分析，我们给出了Ｍａｂｌｅｒ关于缺项级数超越性定理的一个推广．     

Sub-classes and evolution stability of Wolfram's classes in the total-rule cellular automata

Cellularautomata(CA)aremathematicalmodelsforcomplexnaturalsystemscontaininglargernumbersofsimpleidenticalcomponentswithlocalinteractions.TheCAconsistofalatticeofsites,eachwithafinitesetofpossiblevalues.Thesitevaluesevolvesynchronouslyineverytimestep[1～4].Onecellularautomatonconsistsoffourparts:theevolutionrule,theformofgeometricalneighborhood,theinitialconfigurationandtheclock.Whentheclockshowsthattimegoesforwardforonestep,configurationoftheCAupdatesonce.Generally,theevolutionrulesofCAare…     

ON THE BOUNDARY STABILIZATION OF WAVE EQUATION WITH VARIABLE COEFFICIENT

1.IntroductionLetfibeaboundedopendomaininR"(n22)withsmoothboundaryr,u~u(s)betheoutwordnormalofrats.GivenavectorxoER",denotem(x)gx--xo(x6R"),Rgsup{lm(x)fjxCfi}.SetLndsupposer nrAI~0.Weconsiderthefollowingwaveequationonfiwithboundaryfeedback:whereK=(m'u)k,L…