简介：在音乐术语中Tempo是个经常出现的词汇，译成中文就是“速度”。有很多钢琴家将音乐作品的速度视为“生命”——同样的音乐用不同的速度演奏，得到的是完全不一样的效果，贝多芬也不例外。从10岁（1801年）起就跟随贝多芬学习的著名钢琴教育家车尔尼曾经告诉我们：“如果想请贝多芬听你演奏他的作品，他首先要问的是用什么速度，速度不对，贝多芬根本不听。”

简介：

简介：这个长得像垃圾筒的电脑外设其实就是一个”垃圾筒“。它通过蓝牙与电脑进行无线连接．连接后．电脑中被删除的文件就会自动存到Tempo中，反悔了还可以从垃圾筒里刨出来。至于Tempo内部存了多少文件．我们可以从外观上一目了然．已用空间和剩余空间会用不同的颜色显示出来。它的容量有250GB．想装满它也不是很容易的事情．它可兼容Mac和Pc。

简介：Withthetechnologicaldevelopmentofexploitationandseparation,theprimarysourceoflithiumhasgraduallychangedfromoretobrine,whichhasbecomethemainrawmaterial,accountingformorethan80%ofthetotalproduction.Resourcesoflithium-bearingbrineareabundantinChina.Thispaperhassummarizedthespatialandtemporaldistribution,characteristics,andformationmechanismofthelithium-richbrineinChina,aimingtoprovideacomprehensivesetofguidelinesforfuturelithiumexploitationfrombrines.Lithiumbrinesusuallyexistinmodemsalinelakesanddeepundergroundsedimentaryrocksassubsurfacebrines.ThemetallogenicepochofChina'slithium-richbrinespansfromtheTriassictotheQuaternary,andthesebrinesexhibitobviousregionaldistributioncharacteristics.Modemlithium-richsalinelakesarepredominatelylocatedintheQinghai-TibetPlateau.Incomparison,thesubsurfacelithium-richbrinesaremainlydistributedinthesedimentarybasinsofSichuan,Hubei,Jiangxi,andthewesternpartoftheQaidamBasin.Lithium-richsalinelakesarechloride-enriched,sulfate-enriched,andcarbonateenriched,whilethedeeplithium-richbrinesaremainlychloride-enriched.Onthewhole,thevalueofMg/Liindeepbrineisgenerallylowerthanthatofbrineinsalinelakes.Thegenesisoflithium-richbrinesinChinaisnotuniform,generallytherearetwoprocesses,whicharerespectivelysuitableforsaltlakesanddeepbrine.

简介：

简介：分别对桉木浆纤维和棉浆纤维进行TEMPO（2,2,6,6-四甲基哌啶-1-氧化物自由基）氧化,并采用原位复合法,将TEMPO氧化后的桉木浆纤维和棉浆纤维与前躯体溶液CdCl2和Na2S进行反应,制备了TEMPO氧化纤维素/CdS纳米复合材料。利用原子吸收光谱（AAS）、扫描电镜（SEM）、X射线衍射仪（XRD）和原子力显微镜（AFM）对纳米复合材料进行表征。结果表明,TEMPO氧化后的桉木浆纤维和棉浆纤维复合的Cd2＋含量均较高,复合的CdS颗粒为立方晶型;TEMPO氧化桉木浆纤维上复合的CdS颗粒粒径为50～100nm,TEMPO氧化棉浆纤维上复合的CdS颗粒粒径为50nm左右。与TEMPO氧化桉木浆纤维相比,TEMPO氧化棉浆纤维上复合的CdS晶粒尺寸更小、分布更均一。

简介：NutrientandChlorophyll-a(Chl-a)concentrationswereinvestigatedmonthlyalongthreetransectsextendingfromamaricultureareatoopenwatersaroundtheZhangziIslandareafromJulytoDecember2009.Theobjectiveofthisstudyistoillustratefoodavailabilitytothebottom-sowedscallopPatinopectenyessoensisundertheinfluencesoftheYellowSeaColdWaterMass(YSCWM),freshwaterinputandfeedbacksofcultivatedscallops.SignificantthermalstratificationwaspresentinopenwatersfromJulytoOctober,andsalinitydecreasedinJulyandAugustinsurfacelayersinthemariculturearea.Nutrientconcentrationsincreasedwithdepthinbothareasinsummer,butweresimilarthroughwatercolumninNovemberandDecember.Onaverage,nutrientincreasedfromsummertoautumninallcomponentsexceptammonia.Nutrientconcentrationslowerthantheminimumthresholdsforphytoplanktongrowthwerepresentonlyinupperlayersinsummer,butstoichiometricnitrogenlimitationexistedintheentireinvestigationperiod.Column-averagedChl-aconcentrationwaslowerinopenwatersthaninmaricultureareainallmonths.ItincreasedsignificantlyinmaricultureareainAugustandOctober,andwaslessvariableinopenwaters.OurresultsshowthatnutrientslimitationtophytoplanktongrowthispresentmainlyinupperlayerinassociationwithstratificationcausedbyYSCWMinsummer.FreshwaterinputandupwellingofnutrientsaccumulatedinYSCWMcanstimulatephytoplanktonproductioninmariculturearea.FarmingactivitiesmaychangestoichiometricnutrientratiosbuthavelessinfluenceonChl-aconcentration.

简介：