简介：Aprobabilitydensityfunction(PDF)isderivedofbetadistributionwithbothλ3(skewness)andλ4(kurtosis)asparametersforweaklynonlinearwavesurfaceelevationbyuseofamethodrecentlyproposedbySrokosz.ThisPDFnotonlyhasasimplerformthanthewell-knownGram-CharlierSeriesPDFderivedbyLonguet-Higgins,butalsoovercomesanobviousshortcomingofthelatterthatwhentheseriesisunsuitablytruncated,theresultingPDFislocallynegative.TotestthederivedbetaPDF,laboratorialexperimentsofwindwavesareconducted.TheexperimentaldataindicatethatthetheoreticalrequirementsoftheparametersinthebetaPDFarefulfilled.TheexperimentalresultsshowthatthepresentPDFisinbetteragreementwiththemeasureddatathanthebetaPDFonlyincludingparameterλ3,andalsothantheGram-CharlierSeriesPDFtruncateduptothetermofH6.

简介：Thispaperpresentstheexperimentalresultsonthedistributionofsedimentsatchannelbifurcation.Theexperimentshavebeenconductedinaphysicalmodelofchannelbifurcation.Itconsistsofastraightmainchannelwhichbifurcatesintotwobranchchannelsofdifferentwidths.Thetestrigisamobilebedwithfixedbank.Fourdifferentnoseshavebeenusedtostudythephenomenon.Foreachnose,threeupstreamdischargesviz.20l/s,30l/sand40l/shavebeenemployed.Fromthemeasureddata,dischargesandsedimenttransportratiosperunitwidtharecalculatedinthedownstreambranches.Thesedatahavebeensettothegeneralnodalpointrelationandasetofequationshasbeendevelopedtodescribethedistributionofsedimentstothedownstreambranchesfordifferentnoseangles.

简介：Insteady,solid-liquidtwo-phaseturbulentflows,thereexisttwotypicalpatternsoftheverticaldistributionofparticleconcentration.ThepatternIshowsamaximumconcentrationatanelevationabovethebed.ThepatternIIshowsanincreaseoftheparticleconcentrationdownwardoverthewholevertical,withthemaximumatthebed.MostofthetheoriesonparticleconcentrationdistributionhavebeendonewiththepatternII,anditislackofasuccessfultheorycovetingbothofthetwopatterns.Thispaperreviewstheparticledistributiontheories,includingthediffusiontheory,themixturetheory,theenergytheory,thesimilaritytheory,thestochastictheoryandthekinetictheory.Thekinetictheoryisalsoappliedtodescribetheverticaldistributionofparticleconcentrationinbothdiluteanddenseflows.

简介：Aprocessfornumericalanalysisofradialcirculationdistributionofpropellerbladeisproposedandpresented.Itisbasedontheresultsofnumericalsimulationofthevelocityfieldaroundpropellerbladesandinthewake.Thewell-knowntraditionalmethodusingtangentialvelocitydatainthewakeandapplyingStockes'stheoremwasalsoexaminedintheinvestigation.Theresultsfromtwoapproachesarecomparedwitheachother.Itisfoundthatifthetraditionalwayisutilized,inmanycasesanunexpected'hump'appearsinthecirculationdistributionatcertainouterradius.Theauthorscalculatedthecirculationsdirectlyaroundbladesections,anditisreferredasdirectmethod.Theunexpectedhumpofthecirculationdistributiondisappearsintheresultsofdirectmethod.Thisarticlealsodiscussesthereasonsoftheappearanceoftheunexpectedhumpintraditionalapproach.Thedirectmethodisproposedtohaveapotentialinanalyzingorverifyingtheradialroaddistributionfordesignedpropellerandthenumericalanalysisinsteadofexperimentalvalidationforcirculationdistributioncanbeasatoolinthepropellerdesignprocess.

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简介：以便更精确地在粗野货物产量检验发展中的趋势，我们为货物产量的概率分发建模。等到在港口和处理设备的操作效率乘货物轮船花了，粗野货物产量被决定。粗野货物产量是为到达港口的每艘货物轮船决定货物产量的每个方面的所有复合变量的和。概率分发用Wald方程被决定。结果证明粗野货物产量的可变性首先取决于到达港口的不同货物轮船要求的不同时间。这个模型克服以前的模型的缺点：精确地决定未来的特定的价值的概率的无能粗野货物产量。我们货物产量的建议模型取决于在到达港口和在港口处理设备的运作的能力的一艘货物轮船要求的时间之间的关系。同时，影响粗野货物产量的关键因素被分析。为了测试模型，的效率，在山东省的一个端口的货物卷被用作一个例子。在案例研究，实际结果匹配我们的理论分析。

简介：PiceamongolicaisanendemicandendangeredspeciesinChina.EcosystemmadeofPiceamongolicaisaspecialsandyforestecosysteminChina.Itisfoundatecotonebetweenforestandsteppe,oragriculturaldistrictandpastoralarea.Basedoninvestigation,thispaperdiscussedtheformationanddistributionofPiceamongolicaandstudieditsnatureaccordingtoecotonetheory.ItisclarifiedthatPiceamongolicabelongstoPiceameyeriseries.Thatistosay,itbecamealocalracethroughlong-termadaptationtothelocalclimate,thenformedallopatricsemi-species,andfinallyturnedintoataxonomicalspecies.Piceamongolicaforestisasuperzonalclimaxcommunitydevelopinginecotonebetweenforestzoneandsteppezone.

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简介：OnthebasisofaninvestigationonthemangrovesinFujianfromNovember1998toJanuary1999,thespeciescomposition,area,distribution,artificialafforestationofmangrovesandthefactorsrestrictingthedevelopmentofmangrovesinFujianarediscussedinthepaper.SomesuggestionsonhowtodevelopmangrovesinFujianhavebeenputforward.

简介：Page-basedsoftwareDSMsystemssufferfromfalsesharingcausedbythelargesharinggranularity,andonlysupportone-dimensionBlockorCyclicblockdatadistributionschemes,Thusapplicationsrunningonthemwillsufferfrompoordatalocalityandwillbeabletoexploitparallelismonlywhenusingalargenumberofprocessors,Inthispaper.awaytowardssupportingflexibledatadistribution(FDD)onsoftwareDSMsystemispresented.Smallgranularity-tunableblocks,thesizeofwhichcanbesetbycompilerorprogrammer,areusedtooverlaptheworkingdatasetsdistributedamongprocessors.TheFDDwasimplmentedonasoftwareDSMsystemcalledJIAJIA.ComparedwithBlock/Cyclic-blockdistributionschemesusedbymostDSMsystemsnow,experimentsshowthattheproposedwayofflexibledatadistributionismoreeffective.Theperformanceoftheapplicationsusedintheexperimentsissignificantlyimproved.

简介：ThestudiesonthedistributionandvaratiationofthespecificationofphosphorusinthesouthernpartoftheYellowSeaaremade.ThebiogeochemistryofphosphorusintheYellowSeaisdiscussed.ThephosphorusisslightlyhigherinthebottomthaninthesurfacewatersinthesouthernpartoftheYellowSeaandthedissolvedorganicphosphorusisthemainform.Thetransferpatternsbetweenvariousformsofparticulateanddissolvedphosphorusaredifferentinthebottomandsurface,probablyduetothecontributionofdissolvedorganicphosphorus.Thedistributionsofdissolvedinorganicphosphorusanddissolvedorganicphosphorusaremainlyaffectedbythebiologicalprocessesandcouldactasapredictionfactorfortheredtide.ThesupplyofNandPinmostoftheareasinthesouthernpartoftheYellowSeaissufficient,withoutapparentlimitationofNorP.

简介：Recentextensivemeasurementsofreal-lifetrafficdemonstratethattheprobabilitydensityfunctionofthetrafficinnon-Gaussian.Ifatrafficmodeldoesnotcapturethischaracteristics,anyanalyticalorsimulationresultswillnotbeaccurate.Inthiswork,westudytheimpactofnon-Gaussiantrafficonnetworkperformance,andpresentanapproachthatcanaccuratelymodelthemarginaldistributionofreal-lifetraffic.Boththelong-andshort-rangeautocorrelationsarealsoaccounted.Weshowthattheremovalofnon-Gaussiancomponentsoftheprocessdoesnotchangeitscorrelationstructure,andwevalidateourpromisingprocedurebysimulations.

简介：Inthispaper,theconceptofdistributioneffectisproposedwithoutthecausaldiagram.FollowingthenotationofStone[11],weassumethattheexposuretreatmentXisanunknowndeterministicfunctionoftheconfoundersetPa(X)andarandomerrorε.Wediscusssufficientandnecessaryconditionsforhomogeneity,collapsibilityandnonconfoundingfordistributioneffectsanddiscussrelationsamongthem.

简介：适当大小被需要控制钙离子内容并且在好矿物质粒子之中减少相互作用。在这份报纸，闪锌矿/硅石相互作用被希腊语的第六个字母潜在的大小和新奇希腊语的第六个字母潜在的分布(ZPD)学习在钙离子答案的不同集中的测量方法。到分子的学习矿物质表面和原子吸收状态，精力散光谱学(版本)和扫描电子显微镜(SEM)被使用。在矿物质表面上吸附的筹款试剂被相互作用地位分析。结果证明当钙离子集中在溶液高时，筹款试剂的那吸附不是导致的。减少钙离子集中是有效方法在肉减少粒子相互作用。特定的方法是钠碳酸盐的适当数量被增加进使过饱和石膏的答案。矿物质相互作用能被测量ZPD解释。

简介：Usingregionaldatafrom1990to2010inChina,thepaperexaminestrends,determinants,regionaldisparitiesandspatialeffectsofpopulationandeconomicdistributionconsistency.Resultsshowthatpopulationdensityismuchsmallerthaneconomicdensityatnationallevelandintheeastregions,Whilepopulationdensityislargerthaneconomicdensityinmiddleandwestregionsofthecountry.Spatialdependenceandspatialconcentrationexistinthepopulation-economicdistributioninconsistencyinChina.Materialcapital,humancapital,infrastructureconstructionandpoliciesarethemaininfluencingfactorswheneconomiclevelandstructurearecontrolled.Thereareprominentdifferencesintheabovefactorsindeterminingregionalpopulation-economicspatialdistributioninconsistency.Further,neglectingspatialeffectofpopulation-economicdistributioninconsistencycouldresultinunderestimationofmarketmechanismandoverestimationoftheroleofthegovernment.

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简介：城市的簇在一个国家是工业和都市化的高水平的期望的产品，以及是在全球竞争的参予的基本单位。关于中国，城市的簇为增加中国都市化过程被认为是主导的形成。然而，迄今为止没有技术的重合、有效、可信的方法学的系统和集合识别中国城市的簇。这研究调查地理信息技术支持提供中国城市的簇的分发的更好的理解的一个计算机化的鉴定方法的潜力。鉴定方法在ArcInfo宏语言编程的帮助下基于一个地理信息数据库，一个数字举起模型，和社会经济的数据被执行。在方法，初步的边界根据交通可接近性被识别，并且最后的鉴定从在rasterized的帮助下在一个区域限制城市数字，人口，和GDP被完成社会经济的数据集。结果证明方法识别九中国城市的簇，即，珀尔河三角洲，更低的长江山谷，Beijing-Tianjin-Hebei区域，东北中国平原，中间的长江山谷，华中平原，西方的台湾海峡，Guanzhong和Chengdu重庆城市的簇。这研究代表包含中国城市的簇的计算机化的鉴定的第一研究。而且与另外的相关研究相比，研究途径，联合交通可接近性和社会经济的特征，被显示是识别城市的簇的一个不同、有效、可靠的方法。

简介：Inagridinvestigation,dinoflagellatecystswerecollectedfromsedimentsinXiamenWesternHarborinMayof2000,fromwhichfivespeciesofcystswereidentified:Alexandriumtamarensis,A.minutum,Lingulodiniumpolyedra,GonyaulaxscrippsaeandGymnodiniumcatenatum,accountforabout21%inthespeciescomposition.Thequantitativeanalysisofthesedimentsshowsthatthenumberofdinoflagellatecystsvariesfrom51to256cysts/gofsediment,thehighestvalue(＞200cysts/g)beingrecordedatthestationsofthecentralpartofthebay,whilethelowest(＜100cysts/g)atthebaymouth.Agoodlinearrelationshipisfoundbetweencystamountandfine-grainedsediments.Complexphysiognomiesontheseabed,topographtyinthebayandweakwaterexchangearethemainfactorsnotonlyincystaccumulationbutalsointheirdistributionpattern,andhaveresultedinthedifferenceincystdensitiesbetweentheinnerbayandtheouterbayintheharbor.

简介：尽管有在中国喷雾器上增加注意，从来没有它的一般特征的遍及全国的调查。这份报纸在23个地点为喷雾器论述元素的数据在并且在中国附近，主要从文学，和表演绘画一些大规模模式。艾尔，Na，和Se被用来代表外壳，水兵，和污染部件分别地。大多数模式在SWNE被排列。分别地，艾尔和Na对NW和SE最高级，他们的比率变化很快接近海岸。Se从NW日益增多地在华中，和Se/Al比率(污染对外壳的喷雾器的指示物)增加上有宽广最大值到SE。为模仿污染喷雾器的一个简单索引，使用人口密度，年度降水，和吝啬的风速度，足够地复制污染喷雾器的大规模模式并且显示出在NW的外壳的艾尔怎么逐渐地向SE让路给flyash艾尔。