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…     

Atomic-scale computer simulation for early precipitation process of Ni_(75) Al_x V_(25-x) alloy with intermediate Al composition

SincethepublicationoftheclassicalworkofChan[1] andHilliard[2 ] ,therehavebeenextensiveex perimentalandtheoreticalstudiesonthethermody namicsandkineticsofprecipitation process .Recentresearchworkhasbeenconcentratedoncomputersimulation ,mostofwhichwerereviewedbyChen[3] .Mostcomputersimulationswerecarriedoutinbinarysystems[4— 8] .However ,theternaryormulti compo sitionsystemsaremoreimportantinindustries .MechanicalpropertiesofNi Albasedsuperalloyscanbestronglyaffectedbythemorphology ,distribu …     

Deformable surface modeling based on dual subdivision

Free formsurfaces ,especiallynon uniformratio nalB splines (NURBS) ,arewidelyusedincomputeraidedgeometricdesignandcomputer aideddesign/manufacturing .However ,usuallyasurfaceofarbi trarytopologycannotberepresentedbyasingleNURBS .Moreover ,itisverydifficulttosettheknotspacings,manipulatethecontrolverticesormodifytheweightstomeetsomedesignrequestsusingNURBS .Consequently ,subdivisionsurfacesappeartouniformlymodelanycomplexsurfacesofarbitrarytopology[1] .However ,interactivemethodsformodi …     

Distribution and correlation analysis of wildfire and weather data in Japan

Theoccurrence ,spreadanddistributionofwild firesareaffectedbyhumanactivities,weatherandfu eltype ,ortreespecies ,etc .Inalongterm ,thefre quency sizedistributionofwildfiressatisfiesthepow er lawrelation[1— 4 ] connectedwithself organizedcriticality[5,6 ] ,whichisfoundincomplexsystemssuchastheInternet[7— 8] ,earthquake[9] ,epi demics[10 ] ,andsoon .Thedistributionsofverylargefiresandverysmallfiresdeviatefromthepower lawwithheavy tail[1— 4 ,12 ] andflat head[13] phenomena ,respectively .Obser…     

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…     

X…Y(X=LiF，NH3，H20;Y=HF，LiF) 复合物中锉键、氢键的理论计算

在CCSD(T)/cc-pVTZ水平下,对X...Y(X=LiF,NH3,H2O; Y=HF,LiF)复合物的9个结构进行几何构型优化和红外振动频率计算根据定域化分子轨道、原子自然电荷、Wiberg键级的分析表明HFLiF分子中的H-F键是共价键,而Li-F键则为离子键而非共价键H3N...Y (Y=HF,LiF),H2O...Y (Y=HF,LiF)中的氢键或铿键源于静电相互作用,并非共用电子的共价键结合能的计算表明:与HF相比,LiF与X (X=LiF,H2O,NH3)的结合能更高;结合能从高到低依次为LiF gt; NH3 gt;H2O红外振动频率分析表明HF与NH3,H2O形成红移氢键,即H-F键长增加,相应的H-F伸缩振动频率降低H3N...LiF的Li-F键键长增加同时伸缩振动频率减少而LiF与H2O形成铿键后,键长增加0.001 6nm,而Li-F的伸缩振动频率反而增加了2c;m,即蓝移铿键.     

Convex quadratic programming relaxations for parallel machine scheduling with controllable processing times subject to release times

Theproblemconsideredinthispapercanbestatedasfollows:AsetofnjobsJ={1,2,…,n}aregiventobeprocessedwithoutinterruptiononasetofmunrelatedparallelmachinesM={1,2,…,m},suchthateachjobonlyneedstobeprocessedbyoneofthemachines.Eachjobj∈Jisassignedagivenweightwj,denotingitsrelativeimportance;anormalprocessingtimepi,jandareleasetimeri,jdenotetheearliestpointintimewhenjobjcanbeprocessedonmachinei∈M.Theprocessingtimesofjobsarecontrollableinthefollowingmanner[1,2,6]:Thenormalprocessingtimepi,jofjobjcanb…     

数字水印算法研究

提出了一种改进了的数字水印算法.在一般的算法基础上添加两个过程：先将水印用魔方矩阵打散,再对水印分块的映射值（0、1、2、…、15）进行加密,提高了水印的安全性,并且用MATLAB实现的实例说明用本算法嵌入的水印对剪切、压缩等一些图像的操作具有较强鲁棒性.     

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…