学科分类
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199 个结果
  • 简介:TheendoftheColdWarhasunderminedNATO’sraisond’être.Butinsteadofdisintegrating,NATOhassurvivedand,moreover,reformedandexpanded.Anepitomeoftheswiftlychanginginternationalsecuritylandscape,NATO’sdevelopmentistheproductofpolicyadjustmentacrosstheAtlanticandisconstrainedbyconflictinginterestsbothwithinandoutsidetheorganization.Inthefuture,theextenttowhichNATOcanexertitsinfluencedependsonitscapacitytotacklenewthreats.TransformingNATOhasposedasternchallengetoboththeUnitedStatesandEurope.Overall,NATOwillstillberegardedonbothsidesoftheAtlanticasapillaroftheirforeignpolicy,despitetheimportantfactthatthetransatlanticallianceisonthedecline.

  • 标签: 北约 展望 大西洋 安全格局 外交政策
  • 简介:Inthecontextofquantuminformation,weinvestigateextensivelysomeimportantclassesofageneralformofatwo-qubitsystemunderLorentztransformation.ItisshownLorentztransformationcausesadecayofentanglementandconsequentlyinformationloses.Ontheotherhand,itgeneratesentangledstatesbetweensystemspreparedinitiallyinaseparablestates.ThepartialentangledstatesaremorerobustunderLorentztransformationthanmaximallyentangledstates.Thereforetherateofinformationloseislargerformaximumentangledstatescomparedwiththatforpartiallyentangledstates.

  • 标签: 洛伦兹变换 量子信息 最大纠缠态 一般形式 量子比特 丢失率
  • 简介:ChinaLongyuanPowerwaslistedonthemainboardofHongKongStockExchangein2009.ThesuccessfullistingprovedthecorrectnessandtimelinessofChinaGuodian'sstrategyof"leadingenterprisestotransformationbyexploringnewenergyresourcesenergetically."

  • 标签: energy RESOURCES transformation STOCK Exchange SUCCESSFUL
  • 简介:TransformationandreformaretwomajorthemesofChina'surbanizationatthepresentstage.Thispaperarguesthatpopulationurbanization,whichlagsbehindlandurbanization,isignoredintheprocessoftraditionalurbanization.Themostimportanttransformationofurbanizationiscitizenshipprocessforruralmigrantswhohavebeensemiurbanized.Inordertopromoteurbantransformation,acoordinatedimprovingreformmustconsiderthefollowingbasicissues:population,financing,landandurbansystem.

  • 标签: 人口城市化 改革 中国 城市化进程 农村移民 城市转型
  • 简介:Anewhyperspectralimagecompressionmethodofspectralfeatureclassificationvectorquantization(SFCVQ)andembeddedzero-treeofwavelet(EZW)basedonKarhunen-Loevetransformation(KLT)andintegerwavelettransformationisrepresented.Incomparisonwiththeothermethods,thismethodnotonlykeepsthecharacteristicsofhighcompressionratioandeasyreal-timetransmission,butalsohastheadvantageofhighcomputationspeed.AfterliftingbasedintegerwaveletandSFCVQcodingareintroduced,asystemofnearlylosslesscompressionofhyperspectralimagesisdesigned.KLTisusedtoremovethecorrelationofspectralredundancyasone-dimensional(1D)lineartransform,andSFCVQcodingisappliedtoenhancecompressionratio.Thetwo-dimensional(2D)integerwavelettransformationisadoptedforthedecorrelationof2Dspatialredundancy.EZWcodingmethodisappliedtocompressdatainwaveletdomain.ExperimentalresultsshowthatincomparisonwiththemethodofwaveletSFCVQ(WSFCVQ),themethodofimprovedBiBlockzerotreecoding(IBBZTC)andthemethodoffeaturespectralvectorquantization(FSVQ),thepeaksignal-to-noiseratio(PSNR)ofthismethodcanenhanceover9dB,andthetotalcompressionperformanceisimprovedgreatly.

  • 标签: SFCVQ EZW 图像压缩 图像编码 KARHUNEN-LOEVE变换 整数小波变换
  • 简介:Thisreviewbeginswithabriefcommentaryonthediversityofplacentationmechanisms,andthengoesontoexaminetheextensivealterationswhichoccurintheplasmamembraneofuterineepithelialcellsduringearlypregnancyacrossspecies.Ultrastructural,biochemicalandmoregeneralmorphologicaldatarevealthatstrikinglycommonphenomenaoccurinthisplasmamembraneduringearlypregnancydespitethediversityofplacentaltypes-fromepitheliochorialtohemochorial,whichultimatelyformindifferentspecies.Toencapsulatetheconceptthatcommonmorphologicalandmolecularalterationsoccuracrossspecies,thattheyarefoundbasolaterallyaswellasapically,andthatmoreovertheyareanongoingprocessduringmuchofearlypregnancy,notjustaneventatthetimeattachment,braneduringearlypregnancyarekeytouterinereceptivity.

  • 标签: 原生质膜转换 妊娠 子宫 胎盘形成
  • 简介:DNAisthegeneticmaterialofvariousorganisms.ExtracellularDNAadsorbedorboundonsurface-activeparticlesinsoilshasbeenshowntopersistforlongperiodsagainstnucleasesdegradationandstillretaintheabilitytotransformcompetentcells.ThispaperreviewssomerecentadvancesonthebindingandtransformationofextracellularDNAinsoils,whichisfundamentaltounderstandingthenatureofthesoil,regulatingbiodiversity,andassessingtheriskofreleasinggeneticallyengineeredmicroorganisms(GEMs)aswellasbeinghelpfulfordevelopmentofthegeneticevolutionaltheoryofbacteria.Severalinfluencingfactors,suchassoilpH,ionicstrength,soilsurfaceproperties,andcharacteristicsoftheDNApolymer,arediscussed.Todate,theunderstandingofthetypeofmolecularbindingsitesandtheconformationofadsorbedandboundDNAtosoilparticlesisstillinitsinfancy.

  • 标签: 土壤生态学 DNA 脱氧核糖核酸 基因材料 组织吸收
  • 简介:Twodiagnosticsarepresentedforthetransformationofexplanatoryvariablesinregression.OneisbasedonthelikelihooddisplacementproposedbyCookandWeisberg(1982)forassessingtheinfluenceofindividualcasesonthemaximumlikelihoodestimateofatransformationparameter.Theotherisbasedonthelocalin-fluencetheoryproposedbyCook(1986)forassessingtheinfluenceofsmallperturba-tionsontheparameterestimates.Computationsarcperformedforadatasettoillus-tratetheusefulnessofthesediagnostics.

  • 标签: LIKELIHOOD DISPLACEMENT local influence PERTURBATIONS
  • 简介:ThetalentistheenginefactorforShanghaiwhiletransformingtheeconomicdevelopmentmodelinthe12the-five-year-planperiod.TodaythetalentdevelopmentstrategyinShanghaiisnotonlyfacingthegreatchallengesfrominternationalmetropolisanddomesticcities,butalsoexistsaseriesofstructuralproblemsforitself.Toacquireandmaintainitscompetitiveadvantagesinaneraofglobalbrainbattleinfuture,Shanghaineedstodefinitelyorientitsmissiontowardsaglobaltalenthub,acceleratethepaceoftalentsinternationalization,strengthentheadjustmentefforttotalentstructures,enforcethemarketallocationmechanism,optimizethetalentecosystemandinnovatethesystemandmechanism.

  • 标签: 人才战略 城市转型 经济发展模式 国际大都市 竞争优势 发动机
  • 简介:Anewinorganicphosphorus(IP)fractionationschemedevelopedbyJiangandGuwasusedinanincubationexperimenttoinvestigatethetransformationofappliedPinacalcareousfluvisol.Theresultsshowthatafteradditionofcommonsuperphosphate(CSP),theCa2-PinthesoildecreasedgraduallyandtransformedlargelytothelessavailableFe-P,Al-PandCa8-P,ratherthantotheunavailableformsofCa10-PandO-P.ThedifferentIPfractionsrankedinthefollowingorderwithrespecttotheincrementbyadditionofCSPafter120daysofincubation:Fe-P>Al-P>Ca8-P>Ca2-P.Afteradditionofpigmanure,thecontentofCa2-Pinthesoilincreasedrapidlyatfirstandthendecreasedslowly,andtheamountofdifferentIPfractionsaccumulatedafter120daysofincubationrankedinthefollowingorder:Ca2-P>Fe-P>Ca8-P>Al-P.Evidently,thevariationincontentofCa2-PandtheorderofincreaseindifferentIPfractionsinincubationinducedbyapplicationofpigmanurewerequitedifferentfromthatofCSP.TheincreaseinIPfractionsintheincubationofbroadbeangreenmanure(BBGM)for120dayswasintherankofFe-P>Ca2-P>Ca8-P;butbecauseorganicphosphorus(OP)ofBBGMdegradedrelativelyslowly,theincrementinIPfractionswaslowerthanthatofpigmanure.WheatstrawwasdifficulttomineralizeandinducedastrongbiologicalfixationofsoilP,resultinginadecreaseofthecontentofCa2-P,evenCa8-P,Fe-PandAl-P.

  • 标签: 无机磷肥 转化 石灰质土壤
  • 简介:订的对(e,f)如果ef不是幂等,而fe是幂等,常规semigroup的幂等被称为斜对。我们以前证明了有幂等的斜对的四种不同类型。这里,我们在完整的转变semigroups调查如此的斜对的普遍存在。关键词完整的转变semigroups-幂等-斜对先生(2000)题目分类20M20

  • 标签: 完全转化半群 幂等 斜对偶 普遍存在性
  • 简介:INMay2013,YunnanChihongZincandGermaniumCo.,Ltd.(Chi-hongZn&Ge)bought51percentofthesharesoftwoBolivianminingcompaniesandundertookamonth-longevaluationofthemines'localenviron-ments.LaRazonnewspaper,whichhasthebiggestcirculationinBolivia,reportedChihong'sacquisitionwiththeheadline"Chinaassessestheenviron-mentalimpactoftheirinvestments,"claimingthattheminingprojectswerethefirsttopassthetestinBolivia.

  • 标签: 中国经济 经济增长 国民收入 经济建设 改革开放