简介：Mode-andpolarization-divisionmultiplexingoffernewdimensionstoincreasethetransmissioncapacityofopticalcommunications.Selectiveswitchesarekeycomponentsinreconfigurableopticalnetworknodes.Anon-chipsilicon2×2mode-andpolarization-selectiveswitchthatcanroutefourdatachannelsontwomodesandtwopolarizationssimultaneouslyisproposedandexperimentallydemonstratedforthefirsttime,tothebestofourknowledge.Theoverallinsertionlossesarelowerthan8.6dB.Toreducetheinter-modalcrosstalk,polarizationbeamsplittersareaddedtofiltertheundesiredpolarizationsormodes.Themeasuredinter-modalandintra-modalcrosstalkvaluesarebelow-23.2and-22.8dBforallthechannels,respectively.

简介：TheAlkalineThermalTreatment（ATT）ofbiomassisoneofthefewbiomassconversionprocessesthathasapotentialforBECCS（bio-energywithcarboncaptureandstorage）.Combiningin-situcarboncapturewithcreatesacarbon-neutralprocessthathasthepotentialtobecarbon-negative.Thisstudyhasshownthattheconversionofcellulosetosuppressedcanbeachievedthroughthereformingofgaseousintermediatesinafixedbedof10%Ni/ZrO2.Reformingoccursatlowtemperatures≤773K,whichcouldallowforimprovedsustainability.

简介：TheapplicationofLanthanumBromide(LaBr3)detectorsprovidesauniqueopportunitytomeasurelifetimeofexcitedstatesinpicosecond-nanosecondregion.Reducingthebackgroundisofcriticalimportancetogetpreciseresults.Forsomeexcitedstatesfeedingfromisomerswithlifetimelongerthan1μs,itcanbeachievedbytheSpectrometerforHeavyAtomandNuclearStructure(SHANS)[1].143Eunucleiwerepopulatedviathe123Sb(24Mg,4n)fusion-evaporationreaction.Mostoftheevaporationresiduesatgroundstateorlong-livedisomersweretransferredtodetectionterminalafteraflightofabout1.4μsinSHANS.Inthecaseof143Eu,threetransitionshavebeenobserved(Fig.1).

简介：QuantumdynamicscalculationsforthetitlereactionH(2S)+S2(X3-Σg)→SH(X2Π)+S(3P)areperformedbyusingagloballyaccuratedoublemany-bodyexpansionpotentialenergysurface[J.Phys.Chem.A1155274(2011)].TheChebyshevrealwavepacketpropagationmethodisemployedtoobtainthedynamicalinformation,suchasreactionprobability,initialstate-specifiedintegralcrosssection,andthermalrateconstant.Itisfoundnotonlythatthereisareactionthresholdnear0.7eVinbothreactionprobabilitiesandintegralcrosssectioncurves,butalsothatboththeprobabilityandcrosssectionincreasefirstlyandthendecreaseasthecollisionenergyincreases.Theexistenceoftheresonancestructureinboththeprobabilityandcrosssectioncurvesisascribedtothedeeppotentialwell.Thecalculationoftherateconstantrevealsthatthereactionoccurringonthepotentialenergysurfaceoftheground-stateHS2isslowtotakeplace.

简介：对近代物理实验中激光模谱分析实验激光模式图的具体表示形式及所表达的物理含义进行了分析及讨论。

简介：根据光学全息原理，分析了在计算机模拟中把物光、参考光和再现光离散化的方法，并对基元全息和无透镜傅里叶全息进行模拟，实验结果逼真，这有助于学生更好地理解全息摄影的相关理论，为光学全息的理论和实验教学提供了可视化的验证。

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简介：Therearetwokindsofchargingmodeoftheohmpowersupply.Whenthedeviceworksnormallyandtheplasmabreakdownvoltageislow,theohmpowersupplywillruninthelogicalnon-loopcurrentmodewhichcurrentissymmetrical,butwhenthedischargingconditionisnotverywellandtheplasmabreakdownvoltageishigh,theunsymmetricalmodewillbeadopt,i.e.switchingoffthepositiverectifier,

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简介：1.如图所示，将码货放在玻璃杯的塑料盖板上。用塑料尺快速地敲出塑料板，鸡蛋没有随塑料板一起运动，而是向下落进杯子里，原因是鸡蛋和塑料板原来均处于________状态，塑料板受力改变运动状态后，鸡蛋要保持________状态。鸡蛋下落是受到__________力的作用．

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简介：TheHL-2AisthefirstdivertortokamakinChina.ItsconstructionisbasedonthemaincomponentsofASDEXfromIPPandanentirelynewpowersupplysystemisrequiredtopoweritsmagneticfieldcoilsandtheplasmaheatingsystem.ThemostimportantelectricparametersofHL-2Aaretoroidalfieldof2.8kAwithaflattopT,plasmacurrentof450of5s.