简介：

简介：一个新奇计划所有光并且门基于一个Fabry-Perot半导体，光放大器(FP-SOA)被建议，它的可行性被模拟验证。用这个计划，所有光并且门能与10dB的扑灭比率被认识到。扑灭比率上的脉搏间隔和脉搏宽度的影响也被调查。

简介：AlowjitterAll-DigitalPhase-LockedLoop(ADPLL)usedasaclockgeneratorisdesigned.TheDigital-ControlledOscillator(DCO)forthisADPLLisaseven-stageringoscillatorwiththedelayofeachstagechangeable.BasedontheImpulseSensitivityFunction(ISF)analysis,aneffectivewayisproposedtoreducetheADPLL'sjitterbythecarefuldesignofthesizesoftheinvertersusedintheDCOwithasimplearchitectureotherthanacomplexone.TheADPLLisimplementedina0.18μmCMOSprocesswith1.8Vsupplyvoltage,occupies0.046mm2ofon-chiparea.Accordingtothemeasuredresults,theADPLLcanoperatefrom108MHzto304MHz,andthepeak-to-peakjitteris139pswhentheDCO'soutputfrequencyis188MHz.

简介：

简介：SincethereformandopeningupofChina,theCommunistPartyofChinahasbeencommittedtothecontinuousdevelopmentofhumanrightstheoryandtheprotectionofhumanrightsthroughlegalconstruction,inordertopromotethedevelopmentofChina’shumanrightscause.Theprincipleof'respectingandprotecting

简介：Asakindoftwo-dimensionaltransitionmetaldichalcogenidematerial,tungstendiselenide(WSe2)hasattractedincreasingattention,owingtoitsgappedelectronicstructure,relativelyhighcarriermobility,andvalleypseudospin,allofwhichshowitsvaluablenonlinearopticalproperties.TherearefewstudiesonthenonlinearopticalpropertiesofWSe2andcorrelationwithitselectronicstructure.Inthispaper,theeffectsofspatialself-phasemodulation(SSPM)anddistortioninfluenceofWSe2ethanolsuspensionsaresystematicallystudied,namely,thenonlinearrefractiveindexandthird-ordernonlinearopticaleffect.WeobtainedtheWSe2dispersionsSSPMdistortionformationmechanism,andthroughit,wecalculatedthenonlinearrefractiveindexn2,nonlinearsusceptibilityχ3,andtheirwavelengthdependenceundertheexcitationof457nm,532nm,and671nmlasers.Moreover,byuseofitsstrongandbroadbandnonlinearopticalresponse,all-opticalswitchingoftwodifferentlaserbeamsduetospatialcross-phasemodulationhasbeenrealizedexperimentally.Ourresultsareusefulforfutureopticaldevices,suchasall-opticalswitchingandall-opticalinformationconversion.

简介：通过对塞缪尔·巴特勒的TheWayofAllFlesh前四章的翻译，以黄雨石老师的译文作为参考对象，将自己的译文和黄雨石的译文进行对比分析，从中总结出了一些对翻译实践具有指导意义的经验，在文学翻译中，必须坚持忠实和通顺的翻译标准，对不同译文在遇到相同的问题时必须采用不同的策略。

简介：

简介：All-opticalswitchinghasbeentheoreticallyanalyzedinthe3,3'-diethyl-2,2'-thiatricarbocyanineiodide(DTTCI)carbocyaninedyethatexhibitslargeexcited-stateabsorptiontoachievehighcontrastandfastswitching.Switchinghasbeenanalyzedbothnsandpspumppulsewidths.Itisshownthatthereisanoptimumvalueofconcentrationforgivenpeakpumpintensityatwhichmaximummodulationcanbeachieved.Wecanget93.84%modulationoftransmissionofaCWprobelaserbeamat532nmatpeakpumpingintensityof500kW/cm2at763nm,with?t=1nsandconcentrationof80μMinalcohol,resultinginswitch-offandontimeof2nsand8ns,respectively.Theresultshavebeenalsousedtodesignall-opticalNOTandtheuniversalNORandNANDlogicgateswithmultiplepumplaserpulses.

简介：床负担的数量是在沉积运输研究的一个重要物理参数。在床负担测量瞄准困难，这篇论文开发一个装底部的监视器由采用沉积坑方法并且解决象称和desilting的如此的关键问题测量床负担运输率，它能完成长期，平凡的河，河口和海岸的床负担运输率的全天候、即时的telemeasurement。实验室和这个监视器是合理的在的领域测试表演设计，在性质稳定、方便在里面测量，和它能被用来在实际工程监视床负担运输率。

简介：Wepresenthereaseriesofperylenediimide(PDI)basedisomericconjugatedpolymersfortheapplicationasefficientelectronacceptorsinall-polymersolarcells(all-PSCs).BycopolymerizingPDImonomerswith1,4-diethynylbenzene(para-linkage)and1,3-diethynylbenzene(meta-linkage),isomericPDIbasedconjugatedpolymerswithparallelandnon-parallelPDIunitsinsidebackboneswereobtained.Itwasfoundthatpara-linkedconjugatedpolymer(PA)showedbettersolubility,strongerπ-πstacking,morefavorableblendmorphology,andbetterphotovoltaicperformancethanthoseofmeta-linkedconjugatedpolymers(PM)did.DevicebasedonPTB7-Th:PA(PTB7-Th:poly{4,8-bis[5-(2-ethylhexyl)-thiophen-2-yl]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophene-4,6-diyl})showedsignificantlyenhancedphotovoltaicperformancethanthatofPTB7-Th:MA(3.29%versus0.92%).Moreover,thephotovoltaicperformanceofthesepolymericacceptorscouldbefurtherimprovedviaaterpolymericstrategy.Bycopolymerizingasmallamountofmeta-linkagesintoPA,theoptimizedterpolymericacceptorsenabledtoenhancephotovoltaicperformancewithimprovedtheshort-circuitcurrentdensity(Jsc)andfillfactor(FF),resultinginanimprovedpowerconversionefficiency(PCE)of4.03%.

简介：Anoptimalpowerdistributionanalysisforanall-opticalsamplingorthagonalfrequencydivisionmultiplexing(OFDM)schemewithmultiplemodulationformatsincludingdiferentialphaseshiftkeyed(DPSK),diferentialquadraturephaseshiftkeyed(DQPSK),andnon-return-to-zero(NRZ)isproposed.Thenoisetolerancesofdifferentmodulationformatsareanalyzed,andtheoptimalinputpowerratiobetweenphaseandintensitymodulationformatsforthebestoverallreceivingperformanceisinvestigatedunderunchangedtotalinputpower.Moreover,thisschemecanseamlesslycoexistwiththetraditionalWDMchannel.

简介：

简介：Inpastyears,rare-earth-dopedfluoridefiberlasers(FFLs)havedevelopedrapidlyinthemid-infrared(mid-IR)region.However,duetothelackoffiberopticdevicesandchallengeoffluoridefibersplicing,mostmid-IRFFLshavebeendemonstratedwithfree-spaceopticelements,limitingtheadvantagesofall-fiberlasersforflexibledelivery,stability,andcompactness.Here,wereport,tothebestofourknowledge,thefirstpulsedall-fiberFFLinthemid-IRregion.Bytakingadvantageoftheintegrationofblackphosphorusflake,stableQ-switchedandmode-lockedpulseswereobtainedat2.8μmwavelength.Webelievethatthisall-fiberdesignwillpromotetheapplicationofpulsedFFLinthemid-IRregion.

简介：All-opticalwavelengthconvertersareexpectedtobecomekeycomponentsinthefuturebroadbandnetworks.Hereatwo-segmentDFBlaserforthefirsttimeisusedasanall-opticalwavelengthconverter.Usingthislaser,all-opticalwavelengthconversionfrom1.3μmtp1.55μmisdemonstrated。

简介：Accordingtothegoodchargetransportingpropertyofperovskite,wedesignandsimulateap–i–n-typeall-perovskitesolarcellbyusingone-dimensionaldevicesimulator.Theperovskitechargetransportinglayersandtheperovskiteabsorberconstitutetheall-perovskitecell.Bymodulatingthecellparameters,suchaslayerthicknessvalues,dopingconcentrationsandenergybandsofn-,i-,andp-typeperovskitelayers,theall-perovskitesolarcellobtainsahighpowerconversionefficiencyof25.84%.Thebandmatchedcellshowsappreciablyimprovedperformancewithwidenabsorptionspectrumandloweredrecombinationrate,soweobtainahighJ_(sc)of32.47mA/cm~2.Thesmallseriesresistanceoftheall-perovskitesolarcellalsobenefitsthehighJ_(sc).Thesimulationprovidesanovelthoughtofdesigningperovskitesolarcellswithsimpleproducingprocess,lowproductioncostandhighefficientstructuretosolvetheenergyproblem.

简介：Sinceitsfounding60yearsago,thePeople'sRepublicofChinahasbeenpursuinganindependentforeignpolicyofpeaceundertheguidanceofMarxism-Leninism,MaoZedongThoughtandDengXiaopingTheory.Bravingwindandstormindiplomaticfrontandbreakingthroughbramblesandthorns,ithasscoredbrilliantachievements.Througharduousdiplomaticstruggles,

简介：O.General;1.Physicalacoustics;2.Underwatersound;3.Mechanicalvibrationandshock;4.Noiseandnoisecontrol;5.Ultrasonics;6.Speechacousticsandspeechcommunication;7.Physiologicalacoustics;8.Ar-chitecturalacoustics;9.Electroacoustics;10.Acousticalmeasurementandinstrumentation;11.Atmosphericacoustics;12.Geoacoustics;13.Bioaoustics;14.Musicalacoustical;15.Signalprocessing.

简介：

简介：AbstractBackgroundIt remains unclear about the association of muscle mass, strength, and quality with death in the general Chinese population of diverse economical and geographical backgrounds. The present study aimed to comprehensively examine such associations across different regions in China.MethodsBased on the China Kadoorie Biobank study, the present study included 23,290 participants who were aged 38 to 88 years and had no prevalent cardiovascular diseases or cancer. Muscle mass and grip strength were measured using calibrated instruments. Arm muscle quality was defined as the ratio of grip strength to arm muscle mass. Low muscle mass, grip strength, and arm muscle quality were defined as the sex-specific lowest quintiles of muscle mass index, grip strength, and arm muscle quality, respectively. Cox proportional hazards models yielded hazard ratios (HRs) and 95% confidence intervals (CIs) for risks of all-cause mortality in relation to muscle mass, strength, and quality.ResultsDuring a median follow-up of 3.98 years, 739 participants died. The HR (95% CI) of all-cause mortality risk was 1.28 (1.08-1.51) for low appendicular muscle mass index, 1.38 (1.16-1.62) for low total muscle mass index, 1.68 (1.41-2.00) for low grip strength, and 1.41 (1.20-1.66) for low arm muscle quality in models adjusted for sociodemographic characteristics, lifestyle factors, and medical histories.ConclusionLow muscle mass, grip strength, and arm muscle quality are all associated with short-term increased risks of mortality, indicating the importance of maintaining normal muscle mass, strength, and quality for general Chinese adults.