简介：AprotocolformicropropagationusingnodalexplantsfrommaturePinusmassonianatreeshasbeendeveloped.Timeofexplantcollectioniscrucialfortheinitialsuccessofasepticculture.ExplantscollectedinearlyMarchgavethehighestpercentageofexplantsurvival(64.5%)andshoot-formingpercentage(52.3%).Thidiazuron(TDZ)concentrationsignificantlyinfluencedshootformation;4lMTDZwasoptimum,with4.8shootsproducedperexplantwithameanlengthof7.1cmafter120daysofculture.Regeneratedshootsrootedfor60daysinbasicmediumwith1lMNAAwerereadyforgrowthinpots.ThisisthefirstreportonplantletregenerationinvitrofrommaturetreesofP.massonianathatprovidesareliablemethodforpropagatingselectedelites.

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简介：看到第一句就忍不住要唱：Maryhasalittlelamb,littlelamb...原来是新学期开始了，

简介：ThereflectionandtransmissionofLambwavesatoverlapjointsareresearchedbythenumericalmethodandtheexperiments.ThenumericalmethodisusedtosimulatethereflectionandtransmissionofLambwavesatweldswithdifferentwidthson2mm-thickstainlesssteelplates.Thereflectionandtransmissioncoefficientsarecalculatedaswell.Whentheweldswidthislessthan4mm,aquasi-linearcorrelationisobservedbetweenthereflectioncoefficientofSOmodeandtheweldwidth.Incontrasttotheweldwidth,boththegapbetweentwoplatesandthereinforcementheightofwelddonothaveobviouseffectonthereflectioncoefficient.Basedontheresults,weproposethattheweldwidthcouldberapidlymeasuredthroughexaminingtheechoamplitudeofSOmode.Experimentsfurtherconfirmthequasilinearcorrelationandthefeasibilityofourproposedmethod.

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简介：Alongwiththedevelopmentofcomputertechniques,theapplicationofcomputerinthree-dimensionalvisualizationsimulationofplantgrowthprocesshasbeenpaidmoreandmoreattention.TakingCunninghamialanceolataasanexample,themorphologicalparametersfromtheperspectiveofthevisualsimulationweredesignedandthetrees’morphologicalcharacteristicswereanalyzedbasedonthesurveydata.CombinedwithIFS(IteratedFunctionSystem)underthecontrolofthegrowthcurve,byusingObject-orienteddesignmethods,andaccordingtoAPIandmodelrenderingtechnologyprovidedbyDIRECTX9.0,athree-dimensionalvisualizationsystemonthegrowthanddevelopmentofC.lanceolataindividualtreeweredevelopedonthe.NETandDIRECTX9.0platforms,whichrealizedthestaticanddynamicthree-dimensionalvisualizationsimulation.

简介：ToaidinmanagementofCunninghamialanceolata,themaintimberspeciesinSouthernChina,itsvariationofspatialdistributionpatternwasanalyzed.ThreepermanentplotsofC.lanceolataplantationswithapproximatelythesamesiteconditions,setbyChinacontinuousforestinventoryinShunchang,Fujian,wereselected.C.lanceolatagrowthwasdividedintotwostages:youngtrees(5cm≤diameteratbreastheight(DBH)<10cm)andmaturetrees(DBH≥10cm).TheDBHandcoordinatesofeverytree(DBH≥5cm)inthepermanentplotswererecordedin2003and2008.ThefunctionL(r),improvementofRipley’sK(r),thepaircorrelationfunctiong(r),andtheuniformangleindex(W_i)wereusedtoanalyzethespatio-temporalvariationofspatialdistributionpatterns.Thethreepermanentplotshadmeanuniformangleindex(W)between0.494-0.578atlowaltitudes,0.465-0.477atmediumaltitudes,and0.426-0.601athighaltitudes.Resultsshowedthataltitudedidnotaffectthespatialdistributionpattern.TheL(r)andg(r)functioncurvesofmaturetreesweregenerallylowerthanyoungtrees’,i.e.tendtobemorerandomoruniformdistribution.Soregardlessoftheinitialdistributionofyoungormaturetrees,withthepassageoftime,therewasatendencyfortheaggregateddistributiontochangetoarandomdistribution,andarandomdistributiontochangetoauniformdistribution.

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简介：StructurehealthmonitoringbasedondiagnosticLambwaveshasbeenfoundtobeoneofthemostpromisingtechniquesrecently.Thispaperhasabriefreviewofthenewdevelopmentsonthismethodincludingthebasicnovelofthemethod,fundamentalsandmathematicsofLambwavepropagation,narrowbandandwidebandLambwaveexcitationmethods,optimizationofexcitationfactorsanddiagnosticLambwaveinterpretationmethods.

简介：基于有限元分析方法，研究了Lamb波在含有裂纹复合材料板中的传播问题。深入地分析了不同长度和深度的裂纹对Lamb传播的影响。在数值计算中，考虑了网格尺寸和时间积分步长选择。数值结果的正确性可以通过波到达时间和剪切波到达时间的一致性得到验证。分析结果表明，Lamb波在复合材料损伤监测中具有潜在的应用价值。

简介：BasedonthepreviousstudyoncultivationnutritionofCunninghamialanceolataplantationsoffirstgeneration,thecultivationnutritionofC.lanceolataplantationswithmulti-generationwasstudied.Theresultsshowthattherearesignificantdifferencesinthegrowth,developmentandnutrientassimilationamongC.lanceolataplantationswithdifferentgenerationsandnutritionconditions.ThesedifferencesarecloselyrelatedtothelandfertilitydeclineofC.lanceolataplantations.Thispaperde...

简介：在各向同性的金属固体处于静态的应力的状态生产各向异性的性质的事实上，基于非线性的acoustoelasticity的理论，相等的secondorder橡皮常数与静态的应力为金属板被计算。为有应力的薄金属板的盒子，为与静态的应力的方向平行、垂直的宣传的兰姆波浪的二种分散方程被导出。用方程，在在一个金属盘子中的兰姆波浪速度和静态的应力之间的关系被讨论。

简介：一条直接途径被兰姆波浪繁殖在一个稳固的盘子中为累积的秒泛音的一般答案开发了。由兰姆波浪的秒泛音产生的现在的分析集中于基本兰姆波浪的阶段速度确切或近似等于双频率兰姆波浪(DFLW)的盒子。基于获得的一般答案，累积秒泛音回答的数字分析表演与在基本兰姆波浪和主导的DFLW部件的阶段速度之间的刺激来源和差别的位置被联系。

简介：AllfactorsaffectingthePCRsysteminPinusmassonianaLambwereinvestigatedonebyone.TheresultsshowthattheoptimumPCRsystemofEST-SSRwere:2μL10×Buffer(Mg2+Free),30ngtemplateDNA,0.1875mmol/LdNTPs,3.75mmol/LMg2+,8pmolprimerpair,1.0UTaqDNApoly-meraseintotal20μLreactionsystem.Finally,atotalof11isolatesofP.massonianawasusedfortestingthestabilityofthePCRamplification.TheresultsprovethattheoptimumPCRsystemwasstable,reliable,highlyrepetitive.

简介：Approximating-natureforestrymanagementtechniqueapplicationresearchisdevelopedinCiinninghamialanceolataplantationfor17yearsatJiuxianForestFarminSongxiCounty,FujianProvince.TheresultsshowthatthebiodiversityoftheC.lanceolataplantationwasincreasedfrom48.5±3.3to74.6±3.3afteradoptingclose-to-natureforestrymanagementtechniques.Comparedwithconventionalmanagementmethod,thetestedforest’ssoilfertilitywasimproved:thesoilmoisture-physicalpropertiesandsoilexchangepropertieswereameliorated,thesoilnutrientcontentswereincreased;theaveragebreastheight,averagetreeheight,individualvolume,Chinesefirstandvolumeandstandtotalvolumewerepromotedby9.24%-17.64%,8.61%-17.29%,27.94%-58.46%,2.38%-28.64%and8.63%-37.55%,respectively.Theworsethesiteconditions,thegreatertheeffectindexeswithclose-to-natureforestrymanagementtechniqueswereimproved.

简介：在这篇文章，激光产生了瑞利，兰姆波浪被考虑它的脉搏持续时间学习。物理模型和理论答案被介绍在脱离产生政体下面为铝样品预言相应波形。由有选择脉搏持续时间的激光的激动的瑞利和兰姆波浪的波形被激光干涉仪测量并且理论上分析了，并且在测量和分析之间的协议为理论模型和答案的确认被表明。拓宽瑞利波浪并且高顺序兰姆波浪模式消失能被激光随脉搏持续时间的增加发现超声的技术。

简介：二新-carboline-type碱，dichotomineK(1)和dichotomineL(2)，从中国药用的植物StellariadichotomaL的根被孤立。var。lanceolataBge。1和2的结构根据化学、分光镜的工具被决定。