简介：火的出现，让人类拥有了对抗黑夜的法宝。最初，原始人把动物脂肪或者蜡一类的东西涂抹在木棍上，做成照明用的火把。

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简介：就像是drose1和drose1.5一样,在drose2和drose2.5之间也拥有一段密不可分的完美传承。超轻质的SprintWeb材质鞋面在减轻球鞋重量的同时,为双脚提供足够的足部支撑,这样的新式轻质科技鞋面在adiZeroCrazyLight球鞋上首创,经过若干不同球鞋上的实验,在drose2.5上得到更精确的改进,让球鞋更加适合选择他的穿着者——德里克-罗斯。

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简介：Athermoelectricitylightsourceinagaseousplasmadischargebetweentwoelectrodesisdescribed,oneofwhichemitselectronsthermoionically.Theanalyticalmodeldescribingbasicphysicalphenomenaisdeveloped.Theresultsareexcellentagreementwithsimulatedtest.

简介：你可能会说，你孤身前行无人可以依靠你的生活岌岌可危，像把上了膛的枪你正在发抖，亲爱的

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简介：CatalystcontainingshapeselectivezeoliteisusedtoinvestigatethecatalyticcrackingcharacteristicsofpalmoilandthreetypesofhydrocarbonVGOsonafixedfluidizedbed(FFB)unit.Theadvantageofproducinglightolefinsandlightaromaticsbycatalyticcrackingofplantoilisdiscussed.Resultsindicatethatthehydrocarbylgroupoftheplantoilmoleculeisquitereadilycrackable;theC6-C8aromaticsyieldiswellaboveandthelightolefinsyieldisaboutthesamewiththehydrocarbonfeeds,whiletheyieldsoflowvalueproductsarelower;thehydrocarbylgroupoftheplantoilmoleculehasstrongtendencyofaromatization,andcanenterthezeoliteporestoselectivelyformC6-C8aromatics;duringcatalyticcrackingofplantoilandfattyacids,aportionoftheoxygenisremovedintheformofwaterthroughhydrogentransferreaction,whileolefinsarepreventedfrombeingsaturated,whichcanensureproperyieldsofbothlow-carbonolefinsandlightaromatics.

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简介：Physiotherapistshavelongbeenengag-edinthestudyoftheeffectofradia-tiononthehealingprocessofwoundsonskinandotherdiseases.ChengPing,YangHongandXiaQiliangofthePhysiotherapyDepartmentofChanghaiHospitalinShanghaihavedeve-lopeda“H”tubeusingcompoundsof

简介：Thispaperanalysestheinfluenceofcertainparametersandfactorsonthecharacteristicsoftheelectropneumaticloudspeakeranddescribestheexperimentalworkcarriedout.Thedevelopedportableelectropneumaticloudspeakerpossessesgoodpropertieswithaflatfrequencyresponsefrom400Hzto2kHzandamaximumsoundpressrueoutputof120dBatadistance2metreonaxisfromthehornmouth.Themagneticfluxdensityatthemagneticgapis19,000gauss.Theelectropneumaticloudspeakerissmallinsizeandlightweight.

简介：Optofluidics是光学和microfluidics(薄片上的所谓的实验室)的集成。液体的使活动在那里是一种关键技术。在为控制microscale液体的许多方法，轻使活动特别地有趣。轻使活动提供一个新奇方法控制液体的流动为生物医学并且biotechnological应用，等等……设备的复杂性和费用可以被使用完全的光控制极大地有时减少并且可能比另外的方法在操作更灵活。然而，液体的轻使活动是象optofluidics一样的一块发芽的地。有大量工作做。这里，我们系统地基于下列点为液体的轻使活动描述四机制：optoelectrowetting，photothermal效果，放射压力，感光性的物质。

简介：在又一次重新修整我乡下花园的过程中，我决定为一位就要结婚的朋友举行一个大型的庆祝晚会。我邀请了她的60个朋友，然后我便又以更大的热情投入对花园的整修中。我决定为她举行一个花园晚会，当然这也是不得已的事情，因为无论他们挤得多紧我的房子也装不下60个人。况且，花园晚会，听起来就很不错。

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简介：Someauthorshavedevelopedafewmethodsofmeasuringwaveslopesbasedonlightrefraction,includingthemeasurementmethodviathedistributionoflightintensityorcolorunderwater.Anewmethodbasedonlightrefractionisspecifiedforthemeasurementofwavesurfaceelevationinwaveflumeviaimagingtechnology.Aplanepaintedwithblackandwhitestripesisputontheflumefloorasanindicationplane,whichcanbearrangedeasilyandcheaply.Comparedwiththepreviousmethods,thepresentmethodislesssensitivetothenoiseandnonlineareffectsofopticalprocess,whichcanbetakenasadigitalmethod.TheCCDcameraisfixedabovetheflumewithitsopticalaxisarrangedverticallytograbtheimagesofstripesmodulatedbythewavesurface.ThemodulatedvaluecanbecalculatedfromtheHilberttransform,andthenthewavesurfaceelevationcanbeobtained.Thealgorithmandexperimentalprocedurearespecifiedindetail,andsomeexperimentalresultsareprovidedtoshowthevalidityofthepresentmethod.

简介：在风电等新能源发电并网的大背景下，轻型直流输电凭借其控制和运行方式简单，波形好等特点，得到广泛应用。本文介绍了轻型直流输电系统的组成与原理，分析了其优势，总结了其工程情况和应用情况。

简介：Thefinite-differencetime-domainmethodwasemployedtocalculatelightextractionefficiencyofthin-filmflip-chipInGaN/GaNquantumwelllight-emittingdiodes（LEDs）withTiO2microspherearrays.TheextractionefficiencyforLEDswithmicrospherearrayswasinvestigatedbyfocusingontheeffectofthepackingdensity,packingconfiguration,anddiameter-to-periodratio.Thecomparisonstudiesrevealedtheimportanceofhavingahexagonalandclose-packedmonolayermicrospherearrayconfigurationforachievingoptimumextractionefficiency,whichtranslatedintoa3.6-foldenhancementinlightextractioncomparedtothatforaplanarLED.ThisimprovementisattributedtothereducedFresnelreflectionandenlargedlightescapecone.Theengineeringofthefar-fieldradiationpatternswasalsodemonstratedbytuningthepackingdensityandpackingconfigurationofthemicrospherearrays.