简介：

简介：摘要：函数问题是高中数学中的重点内容，同时也是重点与难点。在实际教学的过程中，应做到函数知识的巧妙运用，进而实现解题效率的提升。基于此，本文对加强函数题型间转换训练的方法加以分析，并借助实际的例题探讨具体的解题过程，进而提升对指数函数与对数函数知识点的掌握，最终实现知识的融会贯通。

简介：1重点知识与命题特点1．1重点知识三种函数的重点知识除了表达式、图像与性质，主要是函数、方程及不等式三者之间的关系：

简介：Asimpleapproachforthecondensationofbenzaldehydewithethyleneglycolwasadoptedwithoutemployinganycatalyst.Thestudyrevealsthatfactorsincludingtemperature,molarratioofreactants,andthewaterremovalsignificantlyinfluencetheconversionratioofbenzaldehyde.Theresultsindicatethattheuseofoptimalreactionconditionssuchastemperatureandwaterremovingexhibitsmorepronouncedeffectsontheconversionratioofbenzaldehydecomparedwiththeuseofcatalysts.Inaword,agreenandsimplemethodforthecondensationofaldehydeandmenthandiolhasbeendevisedandinvestigated.

简介：

简介：Theabsenceofnetworkinfrastructureandopportunisticspectrumaccessincognitiveradioadhocnetworks(CRAHNs)resultsinconnectivityandstabilityproblems.Clusteringisknownasaneffectivetechniquetoovercomethisproblem.Clusteringimprovesnetworkperformancebyimplementingalogicalnetworkbackbone.Therefore,howtoefficientlyconstructthisbackboneamongCRAHNsisofinterest.Inthispaper,weproposeanewclusteringalgorithmforCRAHNs.Moreover,wemodelanovelclusterheadselectionfunctionbasedonthechannelheterogeneityintermoftransmissionranges.Tothebestofourknowledge,thisisthefirstattempttomodelthechannelheterogeneityintotheclusteringformationincognitiveradionetworks.Simulationresultsshowthattheperformanceofclusteringissignificantlyimprovedbythechannelheterogeneityconsiderations.

简介：Anintracavityfrequency-doubledverticalexternalcavitysurfaceemittinglaser(VECSEL)withgreenlightisdemonstrated.ThefundamentalfrequencylasercavityconsistsofadistributedBraggreflector(DBR)ofthegainchipandanexternalmirror.A12-mWfrequency-doubledoutputhasbeenreachedat540nmwithanonlinearcrystalLBOwhenthefundamentalfrequencyoutputis44mWat1080nm.Thefrequencydoublingefficiencyisabout30%.

简介：Parameterestimationofsignalsofuniversalsoftwareradioperipheral(USRP)devicesiscrucialtosolvetheproblemofphaseoffsetsofreceivedsignalsindistributedbeamforming.Forsystemsthatwillutilizetheclosedloopfeedbackalgorithmwherethereceiverneedstosendthereceivedsignalstrength(RSS)valuesperiodicallytothebeamformingnodesoastotakeadvantageofenergyconservation,thefrequencyandphaseofthesesignalsshouldbeestimatedbeforesmootheningbynonlinearfilters.ThisarticlepresentstheestimationofthefrequencyoffsetsofaGaussianminimumshiftkeying(GMSK)signalfromN210USRPdevicesinrealtimebyusingtheRadix-2fastFouriertransform(FFT)algorithminGNURadio.Forthesegreencommunicationsdevices,mostoftheneededhardwarepartshavebeensoftwaredefined,therebyreducingthesupposedenergyconsumption.Thefrequencyoffsetsfromreferencecarrierfrequenciesof900MHzand2.4GHzarelessthan3kHzeachbeforetheestimation,buttheaverageoffsetsare45Hzand100Hzaftertheestimation,respectively.Thehighoffsetvalueexperiencedwiththe2.4GHzcarrierwasduetoconsistentinterferencefromdevicesonthatsamefrequency.

简介：格林功能方法(GFM)被利用分析在里面飞机强迫了传送液体的弄弯的管子的颤动，在外部刺激和增加的团和抑制比率的randomicity和分发被考虑的地方。Laplace变换被使用，并且有各种各样的边界条件的格林功能随后被获得。数字计算被执行在正切、光线的排水量上验证一些关键参数的现在的解决方案，和效果进一步被调查。有线性、非线性的运动限制的强迫的颤动问题也简短被讨论。方法能被散发学习与管子或更广泛的问题联系的强迫的颤动问题的另外的形式。

简介：FluorescencequenchingofjanusgreenB(JGB)insodiumdodecylsulfate(SDS)micellebynucleicacids(DNA)wasstudiedusingUV-visabsorption,steadystatefluorescenceemissionmethodsandlifetimemeasurements.IntheSDSmicelle,weakfluorescenceofJGBwasenhanced,andthemaximumemissionshiftedfrom425to410nm.InthepresenceofDNA,thefluorescenceofJGBwasquenched.Linearrelationshipsbetweenthefluorescencequenching(F0/F)andconcentrationsofDNAwereobservedintherangeof2.4×10^-8to1.08×10^-7mol·L^-1forcalfthymusnucleicacids(ctDNA)and1.9×10^-8to3.8×10^-8mol·L-1forfishspermnucleicacids(fsDNA)when2.5×10^-5mol·L^-1JGBwasemployed.Thelimitdetectionwere1.3×10^-8mol·L^-1forctDNAand6.4×10^-9mol·L^-1forfsDNA.AthighDNAconcentration,therewasasystematicdeviationfromtheStem-Volmerequationduetothestaticanddynamicquenchingoccurringsimultaneously.TheproposedmethodwasappliedtothedeterminationofthenucleicacidsinchickenbloodextractionandtheanalyticalresultswereingoodagreementwiththeUV-method.

简介：TwostrainsofgreenmicroalgaeC.reinhardtiandC.pyrenoidosawereexaminedfortheirbiosorptionofMn2+,Fe2+,Co2+,Ni2+,Cu2+,Zn2+,andCd2+fromaqueousmulti-metalsolutions.Awiderangeofbiosorptioncapacitiescanbeobservedduetodifferentstrainsofmicroalgaeanddifferentspeciesoftracemetals.Thischaracteristicwasascribedtothedistinctcomponentsandstructuresofalgalcellwallsandthedifferentphysicochemicalpropertiesoftracemetals,suchasatomicweightandiondensity.C.pyrenoidosashowedhigheruptakecapacitiesthanC.reinhardtiandbothofthemhadapreferencefortheuptakeofcadmiumoverothersinthetracemetalsolution,suggestingtheycanbeagoodbiomaterialforbiosorptionofcadmium.Livemicroalgalcellsdisplayedamorecomplexsorptionprocessthandeadmicroalgalcellsbecauseofcellassimilation.

简介：春季是色彩萌动的季节，它可以是充满生机的蓝绿色，可以是拥有浪漫的粉红色，也可以是代表成熟的大地色……2012的春天，你的主打色又是什么呢？

简介：AgreatamountoffoodbornepathogenswereGram-positive(G?)bacteria,athreattopublichealth.Inthisstudy,consideringthebindingabilityofnisintowardsG-bacteriaandthestablefluorescentabilityofEGFPprotein,afluorescentnisin–EGFPproteinprobewasconstructedbyageneengineeringmethod.NisinandEGFPwereusedasthereceptorandfluorophore,respectively,todetectG?bacteria.ThenisinandegfpgenewereamplifiedseparatelyaccordingtothesequencepublishedinGenBankusinguniqueprimers.ThetwogeneswereclonedintoapET-28b(?)vectorresultinginapET-28b(?)–nisin–egfpvector.ThevectorwastransferredintoEscherichiacoli(E.coli)BL21(DE3)forexpression.Theexpressedproteinwasextracted,purifiedbyaNi–NTAcolumn,andthentestedbytheSDS-PAGEmethodtoconfirmitsmolecularweight.Listeriamonocytogenes(L.monocytogenes),Staphylococcusaureus(S.aureus),andMicrococcusluteus(M.luteus)wereusedastherepresentationsofG?bacteria.E.coliO157,representingthegram-negative(G-)bacteria,wasusedasanegativecontrol.Thebindingspecificityoftherecombinantproteinwasperformedontwotypesofbacteriaandthendetectedthroughfluorescentmicroscopy.Theresultsindicatedthatthenisin–EGFPprobecoulddetectG?bacteriaat108CFU/mL.

简介：Therelationshipbetweentheemissionofpollutantandeconomicgrowthhasattractedalotofattentionintheenvironmentaldebateoftherecentdecades.BasedonsometheoreticalandempiricalresearchonenvironmentalKuznetscurve(EKC),thispaperintroducestheenvironmentaltechnicalinnovationandenvironmentalinvestmentintoSolowgrowthmodeltodiscusstherelationshipbetweenGDPpercapitalandtheemissionofpollutant.Bythedynamicsimulationandparametersanalysis,theresultsofthemodelindicate:(1)when'green'technicalprogressandenvironmentalinvestmentarefixed,therelationshipbetweenGDPpercapitalandtheemissionshowsthelinearrelationship;(2)'green'technicalprogresscanleadtothepositivegrowthrateswithadecreasinglevelofemis-sion,whichiscompatiblewithanEKC;(3)theproportionoftheenvironmentalinvestmentcanleadthedifferentgrowthratesandlevelofemission.Theseresultscanexplainthatdevelopingcountriesare'toopoortobegreen'.

简介：现在有很多人都在使用lE浏览器来浏览网页，但是IE的功能却少得可怜，而且不是很稳定。在这里给大家推荐一款名字为GreenBrowser的浏览器，它是一个基于IE的多窗口浏览器，并拥有更多更好的特性。例如热键、搜集器、鼠标手势、鼠标拖曳、更换工具条皮肤，自动填表等众多功能。更重要的是GreenBrowser是一款绿色软件，给它随意解压到任意目录里面就可以使用．并不在系统里面添加任何东西。下载地址：http：／／dI．163．com／htm1／16／16946．html。

简介：Genomicresearchhasmadealargenumberofsequencesofnovelgenesorexpressedsequencetagsavailable.Toinvestigatefunctionsofthesegenes,asystemforconditionalcontrolofgeneexpressionwouldbeausefultool.Inducibletransgeneexpressionthatusesgreenfluorescentproteingene(gfp)asareportergenehasbeeninvestigatedintransgeniccelllinesofcotton(COT;GossypiumhirsutumL.),Fraserfir[FRA;Abiesfraseri(Pursh)Poir],Nordmannfir(NOR;AbiesnordmannianaLk.),andrice(RIC;OryzasativaL.Cv.Radon).Transgeniccelllineswereusedtotestthefunctionofthechemicalinducerdexamethasone.Inducibletransgeneexpressionwasobservedwithfluorescenceandconfocalmicroscopy,andwasconfirmedbynorthernblotanalyses.Dexamethasoneat5mg/Linducedgfpexpressiontothenearlyhighestlevel48haftertreatmentinCOT,FRA,NOR,andRIC.Dexamethasoneat10mg/LinhibitedthegrowthoftransgeniccellsinFRAandNOR,butnotCOTandRIC.Theseresultsdemonstratedthatconcentrationsofinducerforoptimuminduciblegeneexpressionsystemvariedamongtransgeniccelllines.Theinduciblegeneexpressionsystemdescribedherewasveryeffectiveandcouldbevaluableinevaluatingthefunctionofnovelgene.

简介：AnovelLD-pumpedsingle-frequencymicro-chipgreenlaserispresented.ByusingthecombinationofshortcavityandLoytfilterformedbyRochonprismandKTPcrystal,astablesinglefrequencygreenlaserisobtainedwith60mWoutputat500mWLD-pump.Theoptical-to-opticalconversionefficiencyisabout12%.Theopticalcontactbetweencomponentsofthelaserisadopted.Thislaserhastheadvantagesofacompactstructureandalowcost.

简介：Juglansmandshurica格言的绿皮的摘录是为学习它的杀虫的活动并且分析活跃部件的提取bycommon方法。白酒摘录和氯仿摘录分开的Resultsshowed(用氯仿fromalcohol摘录分开了)J的形式绿色皮。mandshurica对LymantriadisparL的幼虫在接触toxicityand胃毒性举办杀虫的活动...在摘录forfive天的申请以后，为两篇摘录的Lymantriadispar的幼虫的改正的死亡是在≥的集中的超过50%in接触毒性和胃毒性5g·L~(-1)。为白酒摘录和摘录的氯仿部分的insecticidalactivity是在在胃毒性的接触toxicitythan的更多的效果，但是在杀虫的活动的重要差别都不是摘录的foundbetween白酒摘录和氯仿部分。在从绿皮of/mandshurica的氯仿partof摘录的活跃部件被GCMS分析。分析结果证明在氯仿的活跃部件摘录分开的thatthe是：(1)juglone(5-hydroxy-l,4-naphthaoquinone)，相对内容27.11%，(2)1,5-Naphthalenediol，相对内容9.52%，(3)7-Methoxy-l-tetralone，相对内容6.81%，(4)Benzofuran，2,3-dihydro-，relativecontent6.76%，(5)4-Hydroxy-2-methoxycinnamaldehyde，相对内容3.99%，(6)2-Methoxy-4-vinylphenol，相对内容3.05%。

简介：自从2007，Ulvaprolifera在黄海引起的巨大的绿潮每夏天发生了并且为本地政府引起了巨大的经济损失。Subei(诺思江苏省，中国)浅与它的大规模Porphyra水产业，被认为是U的最重要的来源。为绿潮的prolifera。揭示在西南的黄海在这个区域，水流的特征，温度，咸度和推迟的微粒物质(SPM)漂浮和漂流的水藻的物理机制，特别在Subei浅，被学习。光线的沙的地形学在Subei隆起浅抑制水流和原因网的特征纵、纬度的运动。纵的网运动是能带U的一个主导的动态因素。prolifera进近海流水。被水藻在光合作用期间生产的气体的数量决定是否U。在它从Porphyraaquacultural仪器被处理进水以后，prolifera能漂浮很好在海表面上。Subei浅被高混浊描绘，它能导致重要轻变细并且和U的快活影响光合作用。水里的prolifera。根据从2012的卫星遥感数据，在Subei的three-month-averaged表面SPM(4月，5月和6月)浅是140mg/dm3,和Subei的北方浅(34.5的北方

简介：Green-Naghdi(G-N)理论是为水波浪的一个充分非线性的理论。一些研究人员把它称为一个充分非线性的Boussinesq模型。G-N理论的复杂性的不同的度被在哪儿的鈥渓evels鈥?区分越高水平，越多复杂并且大概更精确理论。在这里介绍的研究，比较在G-N理论的二个不同层次之间被做，明确地铺平II并且铺平IIIG-N限制理论。限制理论被给的水平IIIG-N的一个线性分析解决方案。一个平面沙滩上的波浪和变浅的波浪两个都与这二个G-N理论被模仿。水平IIIG-N也限制了理论罐头，这第一次被显示出被用来在浅水里预言液体速度。水平IIIG-N限制了理论被推荐而不是水平IIG-N限制理论当模仿时，充分非线性的浅水飘动。关键词Green-Naghdi理论-Boussinesq模型-充分非线性的水飘动-变浅的波浪基础条款：在资助号码50779008和111工程(B07019)下面由中国的国家自然科学基础支持了。箱箱赵在1984出生了。他是一会儿在哈尔滨工程的液体力学的一个博士候选人大学。他的当前的研究兴趣基于BEM包括Green-Naghdi理论和非线性的波浪身体相互作用。Wen-yangDuan在1967出生了。他在设计大学的哈尔滨是一个教授和一个博士监督人。他的当前的研究兴趣包括非线性的波浪身体相互作用，SPH方法和Boussinesq模型。