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简介：以便在量井思考类型波导解决过多的插入损失和低开／关比率光开关，新奇InGaAs/InAlAs联合了量很好结构被建议。在低应用电场(F=19kV/cm)和低吸收损失的情况中(伪鈮?1.2厘米?1)，一个大否定导致地的折射索引变化(螖n=?0.0134)在操作波长在新奇的联合的量井结构被获得(位=1550nm)。值在上述一样的工作条件上在一口矩形的量井(RQW)由与那相比的超过一～二个数量级是更大的。CLC数字TN365不到资助号码60277034和60436020由中国的国家自然科学基金会支持了

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简介：ThisyearisthefirstyearoftheTwelfthFive-YearPlanperiod.NationalPeople'sConference(NPC)andtheChinesePeople'sPoliticalConsultativeConference(CPPCC)havetakenplaceindifferentprovincessinceJanuary.Intheseconferences,brieflysummarized,'Happiness'becomesahotword.Toenhancethehappinessindex,todevelopproperlyaccordingtopeople'slivelihood,andtosharethefruitsofdevelopmentwiththepeoplehavebecomethecommonconsensus.Beijingadvocates,'

简介：ThisstudyexaminestheseasonalvariationsoftropicalcyclogenesisovertheSouthChinaSea(SCS)usingagenesispotential(GP)indexdevelopedbyEmanuelandNolan.Howdifferentenvironmentalfactors(includinglow-levelvorticity,mid-levelrelativehumidity,verticalwindshear,andpotentialintensity)contributetothesevariationsisinvestigated.CompositeanomaliesoftheGPindexareproducedforthesummerandwintermonsoonsseparately.ThesecompositesreplicatetheobservedseasonalvariationsoftheobservedfrequencyandlocationoftropicalcyclogenesisovertheSCS.Thedegreeofcontributionbyeachfactorindifferentregionsisdeterminedquantitativelybyproducingcompositesofmodifiedindicesinwhichonlyoneofthecontributingfactorsvaries,withtheotherssettoclimatology.OverthenorthernSCS,potentialintensitymakesthelargestcontributionstotheseasonalvariationsintropicalcyclogenesis.OverthesouthernSCS,thelow-levelrelativevorticityplaystheprimaryroleintheseasonalmodulationoftropicalcyclone(TC)genesisfrequency,andtheverticalwindshearplaysthesecondaryrole.ThermodynamicfactorsplaymoreimportantrolesfortheseasonalvariationsintropicalcyclogenesisoverthenorthernSCS,whiledynamicfactorsaremoreimportantintheseasonalmodulationofTCgenesisfrequencyoverthesouthernSCS.

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简介：Side-matchvectorquantization(SMVQ)achievesbettercompressionperformancethanvectorquantization(VQ)inimagecodingduetoitsexplorationofthedependenceofadjacentpixels.However,SMVQhasthedisadvantageofrequiringexcessivetimeduringtheprocessofcoding.Therefore,thispaperproposesafastimagecodingalgorithmusingindirect-indexcodebookbasedonSMVQ(IIC-SMVQ)toreducethecodingtime.Twocodebooks,namedindirect-indexcodebook(II-codebook)andentire-statecodebook(ES-codebook),aretrainedandutilized.TheII-codebookistrainedbyusingtheLinde-Buzo-Gray(LBG)algorithmfromside-matchinformation,whiletheES-codebookisgeneratedfromtheclusteredresidualblocksonthebasisoftheII-codebook.Accordingtotherelationshipbetweenthesetwocodebooks,thecodewordintheII-codebookcanberegardedasanindicatortoconstructafastsearchpath,whichguidesinquicklydeterminingthestatecodebookfromtheES-codebooktoencodetheto-be-encodedblock.TheexperimentalresultsconfirmthatthecodingtimeoftheproposedschemeisshorterthanthatofthepreviousSMVQ.

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简介：Weintroduceanewmodelofone-dimensional(1D)photoniccrystalcomposedofalternatelyarrangedRHMandLHMlayerswithpositiveandnegativerefractiveindicesrespectively,forwhichthetransmissionspectraofthemodelarecalculatednumericallywiththetransfermatrixmethod,andtheband-gapstructureandthepolarizationpropertiesareanalyzed.Wefoundthattheintroductionofnegativerefractiveindexlayers(i.e.LHMmediumlayers)givesrisetosomepeculiarband-gapstructureandpolarizationpropertiesasfollows.Firstly,theforbiddenbandsareextremelywideandthetransmissionbandsareverysharpwithoutoscillation;andsecondly,thechangeofincidentanglehasdifferentinfluencesontheforbiddenbandsofTEandTMmodes.FortheTMmode,theforbiddenbandwidthdecreasessubstantiallyandfinallyvanishes,andfortheTEmodewithcentralwavelength,thetotalreflectionhappensatanyincidentangle.

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简介：Anewcomputationschemeproposedtotacklecommensurateproblemsisdevelopedbymodifyingthesemi-analyticapproachforminimizingcomputationalcomplexity.Usingtheproposedscheme,thelimitstateequations,usuallyreferredtoasthefailuresurface,areobtainedfromtransformationofanintervalvariabletoanormalizedone.Inordertominimizethecomputationalcost,twoalgorithmsforoptimizingthecalculationstepshavebeenproposed.Themonotonicityoftheobjectivefunctioncanbedeterminedfromnarrowingthescopeofintervalvariablesinnormalizedinfinitespacebyincorporatingthealgorithmsintothecomputationalscheme.Twoexamplesareusedtoillustratetheoperationandcomputationalefficiencyoftheapproach.Theresultsoftheseexamplesshowthattheproposedalgorithmscangreatlyreducethecomputationcomplexitywithoutsacrificingthecomputationalaccuracy.Theadvantageoftheproposedschemecanbeevenmoreefficientforanalyzingsophisticstructures.

简介：Withtheadvanceofmultimediatechnologyandcommunications,imagesandvideosbecomethemajorstreaminginformationthroughtheInternet.HowtofastretrievedesiredsimilarimagespreciselyfromtheInternetscaleimage/videodatabasesisthemostimportantretrievalcontroltarget.Inthispaper,acloudbasedcontent-basedimageretrieval(CBIR)schemeispresented.Database-categorizingbasedonweighted-invertedindex(DCWII)anddatabasefilteringalgorithm(DFA)isusedtospeedupthefeaturesmatchingprocess.IntheDCWII,theweightsareassignedtodiscretecosinetransform(DCT)coefficientshistogramsandthedatabaseiscategorizedbyweightedfeatures.Inaddition,theDFAfiltersouttheirrelevantimageinthedatabasetoreduceunnecessarycomputationloadingforfeaturesmatching.ExperimentsshowthattheproposedCBIRschemeoutperformspreviousworkintheprecision-recallperformanceandmaintainsmeanaverageprecision(mAP)about0.678inthelarge-scaledatabasecomprisingonemillionimages.Ourschemealsocanreduceabout50%to85%retrievaltimebypre-filteringthedatabase,whichhelpstoimprovetheefficiencyofretrievalsystems.

简介：Cloudcomputingisatechnologythatprovidesuserswithalargestoragespaceandanenormouscomputingpower.However,theoutsourceddataareoftensensitiveandconfidential,andhencemustbeencryptedbeforebeingoutsourced.Consequently,classicalsearchapproacheshavebecomeobsoleteandnewapproachesthatarecompatiblewithencrypteddatahavebecomeanecessity.Forprivacyreasons,mostoftheseapproachesarebasedonthevectormodelwhichisatimeconsumingprocesssincetheentireindexmustbeloadedandexploitedduringthesearchprocessgiventhatthequeryvectormustbecomparedwitheachdocumentvector.Tosolvethisproblem,weproposeanewmethodforconstructingasecureinvertedindexusingtwokeytechniques,homomorphicencryptionandthedummydocumentstechnique.However,1)homomorphicencryptiongeneratesverylargeciphertextswhicharethousandsoftimeslargerthantheircorrespondingplaintexts,and2)thedummydocumentstechniquethatenhancestheindexsecurityproduceslotsoffalsepositivesinthesearchresults.Theproposedapproachexploitstheadvantagesofthesetwotechniquesbyproposingtwomethodscalledthecompressedtableofencryptedscoresandthedoublescoreformula.Moreover,weexploitasecondsecureinvertedindexinordertomanagetheusers'accessrightstothedata.Finally,inordertovalidateourapproach,weperformedanexperimentalstudyusingadatacollectionofonemilliondocuments.Theexperimentsshowthatourapproachismanytimesfasterthananyotherapproachbasedonthevectormodel.

简介：由通过卷索引(LRI)的叶的介绍用有效的叶区域索引(ELAI)代替叶区域索引(LAI)，相片的分布在三混合米饭联合的华盖的综合地活跃的放射(同等)，有高LRI的LiangyouE32，有中等LRI的Liangyoupeijiu和有非滚动的叶子(正常)的Shanyou63，被模仿。模型能基于LAI比那精确地基于ELAI预言更多。在三联合的同等拦截，变换和利用效率被学习评估他们的最佳的LRI和LAI。LiangyouE32的同等利用效率由于过多的滚动叶子和更少的ELAI是更低的，并且因为有缺点的同等拦截和更低的光合的率和浸透点，Shanyou63的在在华盖的更低的层也是更低的。与上述二联合相比，Liangyoupeijiu在华盖，和更高的同等利用效率显示出同等拦截和变换效率的更适当的分发。分别地，为Liangyoupeijiu的最佳的LRI和LAI是0.11和7.6它接近了观察价值，0.11和7.9分别地。然而，最佳LAI为LiangyouE32是9.8并且6.2为Shanyou63，比那些在当前的植物密度下面更大或小，它导致了同等利用的更低的效率。而且，分别地，为LiangyouE32和Shanyou63的最佳LRI是0.12和0.08它为Liangyoupeijiu(0.11)接近了实际LRI。

简介：Poroussiliconpillararray(PSPA)sampleswhichareidealsubstantialmaterialswithdominantelectronicandluminescencepropertieswerepreparedbysurfaceetchingmethod.ZnOnanorodswithorwithoutMndopinggrownuniformlyandalignedontoPSPAregardlessoflatticematchingshowvariousphotoluminescence(PL)properties.ThedopedMnionsinZnOnanorodsweredirectlyobservedbyX-rayphotoelectronspectroscopy(XPS),andZnOstructuresweredetectedbyX-raydiffraction(XRD).Asthedopingconcentrationincreases,XRDpeaksofZnOnanorodsshifttolowangle.TheinfluencesofdopingMnionsonluminescencepropertiesofZnOnanorodswereinvestigated.Exceptfortheultraviolet(UV)PLband,thebroadPLbandisobservedatvisibleregion.Thebandcouldbedividedintothreeseparatebands(orange,greenandred)byLorentziandeconvolution.TheintensityoforangePLbandfirstlyincreasesthendecreases,andthengetsthemaximumatthedopingMn-to-Znmolarratioof2.0:100.0whichisthemosteffectivedopingconcentration.ThegreenPLbandisattributedtozincvacancyofZnO,theorangePLbandtoMnionsrecombinationofitself,andtheredPLbandtooxygenvacancyofZnO,respectively.AstheMn-dopedZnOnanorodscouldemityellowgreenluminescenceexcitedbyUVradiation,anddopedMnionscouldimprovethecolorrenderingindexoftheluminescence,thenanorodscouldbeusedaspromisingwhite-lightemittersinthefuture.