学科分类
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8 个结果
  • 简介:有趣的饮食传统74岁的金女士解释道,鸡蛋代表重生和再生。饺子的形状像中国曾经作为通用货币的金元宝。“这表示你有很多钱,”出生在上海的金女士说。下面条也很恰当。“面条代表长寿,”金女士说。

  • 标签: 英语学习 学习方法 阅读知识 阅读材料
  • 简介:我们常说,读书就是同作者对话;既然这样,能不能通过直接与真人交谈,获得需要的知识呢?这正是HumanLibrary的宗旨。

  • 标签: 中等教育 英语 阅读 理解
  • 简介:Althoughthestructuredlightsystemthatusesdigitalfringeprojectionhasbeenwidelyimplementedinthree-dimensionalsurfaceprofilemeasurement,themeasurementsystemissusceptibletonon-linearerror.Inthiswork,weproposeaconvenientlook-up-table-based(LUT-based)methodtocompensateforthenon-linearerrorincapturedfringepatterns.Withoutextracalibration,thisLUT-basedmethodcompletelyutilizesthecapturedfringepatternbyrecordingthefull-fielddifferences.Then,aphasecompensationmapisestablishedtorevisethemeasuredphase.Experimentalresultsdemonstratethatthismethodworkseffectively.

  • 标签: 非线性误差 条纹投影 误差补偿 查表法 表面轮廓测量 简便
  • 简介:Globallook-uptablestrategyproposedrecentlyhasbeenproventobeanefficientmethodtoacceleratetheinterpolation,whichisthemosttime-consumingpartintheiterativesub-pixeldigitalimagecorrelation(DIC)algorithms.Inthispaper,agloballook-uptablestrategywithcubicB-splineinterpolationisdevelopedfortheDICmethodbasedontheinversecompositionalGauss–Newton(IC-GN)algorithm.Theperformanceofthisstrategy,includingaccuracy,precision,andcomputationefficiency,isevaluatedthroughatheoreticalandexperimentalstudy,usingtheonewithwidelyemployedbicubicinterpolationasabenchmark.Thegloballook-uptablestrategywithcubicB-splineinterpolationimprovessignificantlytheaccuracyoftheIC-GNalgorithm-basedDICmethodcomparedwiththeoneusingthebicubicinterpolation,atatrivialpriceofcomputationefficiency.

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  • 简介:Radiationexposureisahazardforpatientsandphysiciansduringfluoroscopically-guidedprocedures.Invasivecardiologistsareexposedtohighlevelsofscatterradiationandbothincreasingproceduralcomplexityandhigheroperatorvolumescontributetoexposureaboverecommendedthresholds.Standardshieldingdoesnotoffersufficientprotectiontotheheadandneckregionandthepotentialfornegativebiological,subclinical,andclinicaleffectsexists.Largepopulationstudiessuggestthatcranialexposuretolowdoseradiationincreasestherisksoftumordevelopment.Inaddition,modestdosesoftherapeuticcranialradiationhavebeenlinkedwiththedevelopmentofbraincancer.Althoughacausalassociationbetweenscatterradiationinthecathlabandbraincancerdoesnotcurrentlyexist,giventheknowndetrimentaleffectsofradiationexposuretotheheadandneckregionsupportafocusonpotentialmethodsofprotectionforboththepatientandtheoperator.

  • 标签: cardiac CATHETERIZATION percutaneous CORONARY intervention invasive