简介:Non-destructivetesting(NDT)hasbeenwidelyusedinmanyfields,wecaneasilyseeitisbeingusedinshipbuilding,aerospace,weaponsmanufacturingandsoon.ICTisoneofthebestnondestructivetestingmethodscurrently,butithasnotbeenusedwidely,becauseitrequiresmuchcomputeandcostsmuchtime.Defectlocationisoneofthemostimportantprocessingstepsinthedigitalimageanalysis.Defectlocationwouldcorrespondinglyreducethetimespentinthetesting.Wemayonlyrequirelocatingthedefectsinsomecase.So,wedividetheCTimagesintoseverallittleblockswhichthesquareisequal,andthencalculatethefractaloneachblock.Bydeterminingthevalueandconnectedregionnumberofthefractaldimension,wecanlocatedefectsoftheimage.Theresultsshowthattheblockfractaldimensionisausefulandtime-savingdefectlocationmethod.
简介:Whiletheincreasingdevelopmentofmoderninformationtechnology,theglobalizationisbecominganobviousfeatureoneducationalsituations.Therefore,masteringsomenecessarybilingualcompetencieswillpresentessentialmeaningforeducators.Inthecaseoflanguageteacherswhoteachingintheethnicallypluralcountries,forinstance,China,theUnitedStates,languageteachershavetofacetovariousdifficultiesontheprocessofteachinginthebilingualclass.Currently,theadvancedtechnologyisgraduallybeingappliedintolanguageteaching,andthenprovidesaseriesofadvantagesonimprovingthequalityoflanguageteaching.Firstly,theessaywillanalysethebarrierswhichexistinthelanguageclass,whichinthelevelofChineseuniversity.Secondly,itwillsystematicallydescribehowICTcanhelplanguageteacherstosolvedifficultiesonteachinganddisplaydiverseinnovativetechnologicaltoolsoflanguageteaching.
简介:ICT产业正逐步成为整个社会经济的创新源泉,尤其是随着互联网、移动互联网产业的快速崛起,ICT将引领大量传统行业进行深刻变革,打破既有的市场规则,重塑产业格局,激发传统业态的发展活力,ICT在推动社会经济可持续发展、改善人类生活水平等方面也将发挥越来越重要的作用。可以说,ICT已经全面渗透至各行各业,甚至人类生活的方方面面。今年世界电信日主题定位于“电信与信息通信技术:创新的驱动力”,重点强调了ICT在整个国民经济当中的驱动作用。从国内市场来看,ICT产业的拉动作用非常显著,小米等科技企业的涌现充分验证了ICT产业对国民经济的驱动作用,尤其在整体国民经济下行的背景下,ICT与各类业态的融合发展,
简介:摘要目的探讨256iCT低剂量扫描在胸主动脉CT血管造影中的应用方案及效果.方法选择2014年3月-2015年3月在我院行胸主动脉CT血管造影的患者150例,随机分为A、B、C、D、E五个组,各30例,A组患者使用机器默认设置进行扫描(120kV、350mAs),B组患者扫描设置为120kV、300mAs,C组患者扫描设置为120kV、250mAs,D组患者扫描设置为120kV、200mAs,E组患者扫描设置为120kV、50mAs,比较五种方案CT的图像质量.结果A、B、C、D组患者CT的图像质量无明显差异(P>0.05),E组与A组的的图像质量存在差异(P<0.05).结论256iCT低剂量扫描应用于胸主动脉CT血管造影中,推荐mAs为200mAs,可以为检查者在最少受照剂量下,提供优质的CT图像,有效的控制了辐射剂量的吸收.关键词低剂量扫描;胸主动脉CT血管造影;图像质量;Theapplicationsandeffectsof256iCTlow-dosescanusedinthoracicaortaCTangiographyAbstractobjectiveToexploretheapplicationssandeffectsof256iCTlow-dosescanusedinthoracicaortaCTangiography.MethodCollected150casesofpatientsinourhospitalfromMarch2014toMarch2015,whowouldbetreatedbythoracicaortaCTangiography,randomlydividedthemintoA,B,C,D,Efivegroups,n=30.ThescanfactorsofAgroupweredefaultsetting(120kv,350mAs),ThescanfactorsofBgroupwere120kV、300mAs,thescanfactorsofCgroupwere120kV、250mAs,thescanfactorsofDgroupwere120kV,200mAs,thescanfactorsofEgroupwere120kV、150mAs,comparedCTimagequalityoffivegroups.ResultstheCTimagequalityofA,B,C,Dgrouphavenoobviousdifference(P>0.05),theimagequalityofgroupEhadsignificantlydifferenceswithgroupA(P<0.05).Conclusionapplicationoflow-dosescan256iCTtothoracicaortaCTangiography,recommendedsettingis200mAs,useleastilluminateddosestKoeyprwoovriddsehighqualityofCTimage,effectivelycontroltheabsorptionofradiationdose.Low-dosescan;ThoracicaorticCTangiography;Theimagequality中图分类号R816文献标识码A文章编号1008-6315(2015)12-1027-01
简介:信息技术对课堂教学逐渐显现突出的作用,教师作为教学过程的主体,需要具备将ICT、学科教学法和学科内容有效整合的TPACK知识,通过在设计方面的教学创新,以真正促进数字一代学习者学习方式的转变。通过对432位教师的调查数据统计分析发现,教师ICT应用知觉对其设计创新素质中的行为子维度存在显著的预测作用,而教师创新自我效能感作为中介变量,会影响这一作用的效果,以及会影响到教师的设计创新素质中的意向子维度。学校可以通过多种途径提升教师ICT应用知觉水平,从而提高教师的创新自我效能感,进而促进在信息化教学环境下教师设计创新素质的发展。