DevelopmenthistoryLasertechnologyappearedinthe1960s,anditsactualapplicationbeganintheearly1970s.Theearliestlasertransmitterwasanelectroniclasertubefilledwithhelium-neon(He-Ne)gas,whichwasverylarge,soi...

TheoreticalsourcesThetheoryofsocializationofproductionisanimportantpartofallMarx’seconomictheories.ThistheoryisMarx’stheoreticalsummaryofproductivityinthecapitalistera.MarxbasedTheactualhistoricalsitu...

SynonymHDLCgenerallyreferstoadvanceddatalinkcontrolTheabovecontentisreviewedandannouncedbytheNationalScienceandTechnologyTermReviewCommitteeDefinitionAdvancedDataLinkcontrol(HDLC,High-levelDataLinkCon...

OverviewInternetTVincludesIPTVandInternetTV.ItusestheInternettointegratemultiplecontentresourcestobroadcastliveoron-demandTVprograms.Itisamorepopularformofvideoprogramtransmissioninrecentyears.Itrelie...

Thisreferstowhetherthespeakersupportsmulti-channelsimultaneousinput,whetherthereisanoutputinterfaceforpassivesurroundspeakers,whetherthereisaUSBinputfunction,etc.Thenumberofexternalsurroundspeakerstha...

Asysmmetricalcableismadeofseveralpairsofdoubleconductorscalledcorewiresinaprotectivesheath.Inordertoreducetheinterferencebetweenthepairsofwires,eachpairofwiresismadeintoatwistedshape,whichiscalledatwi...

StatisticalmethodsStatisticsarerichandintricate,anditisnoteasytoselectstatisticalanalysismethodsreasonably.Forthesamedata,ifyouchoosedifferentstatisticalanalysismethods,sometimestheconclusionsarecompl...

PhonemictextPhonetictextrecordslanguagebyspecifyinglettersforphonemes.English,Arabic,andRussianbelongtothistypeoftext.ThespellingandpronunciationofChineseandEnglishphoneticcharactersareseriouslyoutofs...

IntroductionFoundedin1994,theWorldWideWebConsortiumisthemostauthoritativeandinfluentialinternationalneutraltechnicalstandardorganizationinthefieldofWebtechnology.Sofar,W3Chaspublishedmorethan200far-re...

Mainfeatures(1)IntegrationItcanobtain,store,organizeandsynthesizeinformationuniformlythroughmultiplechannels.Picture(1picture)Wordprocessing:Notepad,WordPad,Word,WPSGraphicsandimageprocessing:PhotoSho...

IdealopticalsystemTheidealopticalsystemisanimagingsystemthatcanproduceaclear,completelysimilarimagetotheobject.Thebeamsinwhicheachlightrayoritsextensionlinesallintersectatthesamepointarecalledconcentr...

BasicinformationHistoryBeijingUniversityofPostsandTelecommunicationsIn1955,theBeijingUniversityofPostsandTelecommunicationswasestablishedonthebasisofthetwomajorsofTianjinUniversity'sDepartmentofTeleco...

BasicinformationSynopsis"Boom,boom"and"hoo,hoo",therapidheartbeatandgaspingsoundsaredeafening.Everythingbegantoblur,andthendistorted.Then,asharptrainwhistlepulledCaptainColtStevens(playedbyJackGyllenh...

DevelopmentCountriesintheworldregardthedevelopmentofnewmaterialsasanimportantaspectofeconomicdevelopmentandtechnologicalprogress.Variousnewtextilefibersareusedasimportantmaterialsintoday'shigh-techfie...

AbriefhistoryofresearchInprimitivesociety,primitivepeopleperceivetheexistenceofcarbondioxideintheirdailylife,butduetothelimitationofhistoricalconditions,theylookattheinvisibleandintangiblecarbondioxid...

IntroductionWhetheryouuseyoursmartphoneorPCtosurftheInternet,yourmobilephoneorPCwillbeassignedanIPaddress,andthemobilephoneorPCwillusethisIPaddresstocommunicatewiththeInternetCommunicateandexchangeinf...