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Weweredelightedwiththepositiveresponsetothefirsteditionofthiook.Thereis，naturally，alwayssomesenseoftrepidationwhenonewritesthefirsttextbookatthebirthofanewfield.Onedearlyhopesthefieldwillcontinuetogrowandblossom，butthenagain，willthesubjectmatterofthebookquicklybeeobsolete?Toattempttoalleviatethelatter，wemadeaconsciouseffortinthefirsteditiontofocusonthefundamentalconceptsandbuildingblocksofthisnewfieldandleaveoutanyspeculativeareas.Giventhecontinuinginterestinthefirstedition，evenafteradecadeofexponentialgrowthofthefield，itappearsthatwemayhavesucceededinthisregard.Ofcourse，withgreatgrowthemanynewphenomenaandadeeperunderstandingofoldphenomena.Wefelt，therefore，thatthetimewasnowripeforanupdatedandexpandedsecondedition.
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为了进一步加大对气象标准的学习、宣传和贯彻实施工作力度，使各有关方面和广大气象工作者做到了解标准、熟悉标准、掌握标准、正确运用标准，充分发挥气象标准支撑和保障气象事业高质量发展的基础性、战略性作用，中国气象局政策法规司对颁布实施的气象行业标准按年度进行编辑，已出版了15册。本册是第16册，汇编了2019年颁布实施的气象行业标准共74项，供有关人员学习使用。
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Followingthebirthofthelaserin1960,thefieldof"nonlinearoptics"rapidlyemerged.Today,laserintensitiesandpulsedurationsarereadilyavailable,forwhichtheconceptsandappromationsoftraditionalnonlinearopticsnolongerapply.Inthisregimeof"extremenonlinearoptics,"alargevarietyofnovelandunusualeffectsarise,forexamplefrequencydoublingininversionsymmetricmaterialsorhigh-harmonicgenerationingases,whichcanleadtoattosecondelectromagicpulsesorpulsetrains.Otherexamplesof"extremenonlinearoptics"coverdiverseareassuchassolid-statephysics,atomicphysics,relativisticfreeelectronsinavacuumandeventhevacuumitself.Thisbookstartswithanintroductiontothefieldbasedprimarilyonextensionsoftwofamoustextbookexamples,namelytheLorentzoscillatormodelandtheDrudemodel.Herethelevelofsophisticationshouldbeaccessibletoanyundergraduatephysicsstudent.Manygraphicalillustrationsandexamplesaregiven.Thefollowingchaptersgraduallyguidethestudenttowardsthecurrent"stateoftheart"andprovideaprehensiveoverviewofthefield.Everychapterisacpaniedbyexercisestodeepenthereade
