on writing well目录(on writing well是什么)

原创 loveyou i  2024-03-06 16:39  on writing well目录(on writing well是什么)已关闭评论
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本文节选自《On Writing Well》电子版：

StreamofuraniumionsisdeflectedbyelectromagnetsinaVacuumchamber.The_chamberanditsassociatedequipmentarecalledacalutron.TheheavierU-238ionsaredeflectedjless_thantheU-235ions，andthisSlightdifferenceisusedtoseparateoutthefissileU-235.However，“whatintheoryisavefryefficientpfrocedureisinpracticeavery，verymessyaffair,”saidLeslieThorne，WhorecentlyretiredasfieldactivitiesmanagerontheJIAEAactionteam.Invariably，SomeU-238ionsremainmixedwiththeU-235，andionStreamscanbehardto_control.0.K，That”sSsveryclear，ButppprristheprocessSomessy9?友rraretheionStreamshardtocontfrol2Thewriterobliges.Heneverforgetswherehelefthisreadersinthepreviousparagraphandwhattheywanttoknownext.Thetwodifferentisotopicmaterialsaccumulateincup-ShapedgraphitecontainerSs.，Buttheiraccumulationinthetwo，containerscanbethrownoffwildlybysmallvariationsinthepowerto，andtemperatureof，theelectromagnetSs.ThusinpracticethematerialstendtoSpatterallovertheinsideofthe_vacuumchamber，whichmustbecleanedaftereveryfewdozenhoursofoperation，That”sanybo

on writing well电子版

dy”sSsideaofmessy.，Buthasthisprocess，nevertheless，everWorked2?Hundredsofmagnetsandtensofmillionsofwattsareneeded，DuringtheManhattanProject，forexample，theYY-12EMISfacilityat0akRidgeinTennesseeUsedmorePowerthanCanada，plustheentireU.S，StockpileofSilver;the]atterWasusedtoWindthemanyelectromagnetsredquired(coppefrwasneededelsewhereinthewareffort).Mainlybecauseofsuchproblems，U.S，SscientistsbelievedthatnocountryWouldeverturntoEMIStopfroducetherelatively]argeamountsofenrichedmaterialneededforatomicWeapons....ThediscoveryoftheIraqiEMISprogramhadmuchofthedramaofagoodSpynovel1，Thefirstclueapparent1LycameintheclothingofU.S，hostagesheldbyIraqiforcesatTuwaitha，AfterthehostagesWerereleased，theirclotheswere，analyzedbyintelligenceexperts，whofoundinfinitesimalSamplesofnuclearmaterialswithisotopicconcentrationspfoducibleonlyinacalutron....“Suddenlywefoundalivedinosaur,”saidDemetriosPerTfricos，deputyheadoftheIAEA”sIraqactionteam.Eveninthemidstofsuchhightechnologythewriterneverlosesthehumaningredient.Thi

on writing well读后感

sisntastoryabout“science”;it”sastoryaboutpeopledoingscience一a_gangofclandestinebompbp-makersandateamofhigh-techcops.，Thequoteaboutthedinosaur1Spuregold，ametaphorwecanallunderstand，Evena_childknowsthatdinosaursaren”taroundanymore.WiththeinevitabilityofgooddetectiveWork，thearticlebuildstotheoutcomethathasbeenthewholepointoftheinvestigation:thediscoverythatIraq，“notlimitingitselfto“pfroducingWeapons-gradematerials，WaSConcurfent1Tystrugglingtobuildadeliverableweaponaroundthematerial，a_dauntingtaskknownasWeaponization.”Firstwearetoldwhatoptionsexistforanyoneattemptingthattask:Thetwobasictypesofatomicbombsaregundevicesandimplosionweapons.Thelatteraremuchmoredifficulttodesignandbuild，butprovidehigherexplosiveyieldsfora_givenamountoffissilematerial.ITIAEAinvestigatorshavefoundno_evidencethatIraqwasactivelypursuingagundevice;计Liisclear，theySay，thattheyconcentfratedtheirmoneyandfresourcesonanimplosiondevice，andhadevenStartedworkonfairlyadvancedimplosiondesigns.What”sanimplosiondevice?Readon:

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