学科分类
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21 个结果
  • 简介:信息产业时代的到来,中国载人飞船的成功发射,数码风暴的“狂风巨浪”,都为我们生活的祥和空间平添一份精彩!

  • 标签: 高中 英语 科技文阅读 阅读训练
  • 简介:古人有云“物以稀为贵”。但在IT行业愈演愈烈的今天,恐怕没人能否认这一点:时代变迁,现在已经进入了物以“薄”为贵的时代。

  • 标签: IT行业 时代变迁 “薄”
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  • 简介:完成一个14位的连续近似收款机analog-to-digital变换器(SAR模数转换器)的一种错误修正技术被建议。一个悦耳的裂口电容器被设计消除寄生电容器引起的失配。进程失配引起的电容器数组的线性错误被能改进采样率的一个新奇刻度电容器数组校准。双比较仪的拓扑学保证ADC的速度和精确。模拟结果证明在刻度以后的SAR模数转换器在500kilosamples/s完成83.07dBSNDR和13.5小点ENOB。

  • 标签: 自校准技术 ADC SAR 寄生电容 数字转换器 纠错技术
  • 简介:1959年.0LYMPUS发布了革命性的PEN系列半幅相机,小巧的体积和高素质的成像让它风靡一时.五十年后的今天.最新的数码科技融入到重新设计的PENDIGITAL中来……

  • 标签: PEN 优雅 影像 数码科技 革命性
  • 简介:Thestressintensityfactor(SIF)isacriticalparameterassociatedwiththefracturebehaviourofmaterials.Inthispaper,weselectthedisplacementfunctionaroundacracktipastheshapefunctionofthedigitalimagecorrelation(DIC),whichmakesitpossibletodirectlycalculatetheSIFbythecorrelationscheme.Moreover,weuseanon-rectangularsubset,whichcanreducetheinfluenceofplasticdeformationandcrackwidthontheDICmeasurementaccuracy.WemeasuredtheSIFofamodeIcrackinasuper-hardaluminiumalloyspecimentoverifytheperformanceoftheproposedmethod.OurexperimentalresultsshowthataDICwithaspecificshapefunctioncanbeusedtoaccuratelyandefficientlycalculatetheSIF.Furthermore,wealsopresentapracticalapplicationofourproposedmethodfordeterminingtheSIF,crackpropagationangleandcracktipdisplacement.

  • 标签: Digital image CORRELATION (DIC) SHAPE function
  • 简介:Randomphasemasksplayakeyroleinopticalimageencryptionschemesbasedondoublerandomphasetechnique.Inthispaper,amixedchaoticmethodisproposed,whichcanefficientlysolvesomeweaknessesthatone-dimensional(1-D)singlechaoticmapsencountertogeneraterandomphasemasks.Basedonthechaoticrandomphasemasks,opticalimageencryptionanddecryptionarerealizedwithasingle-shotdigitalholographictechnique.Intheproposedencryptionscheme,theinitialvalueandparametersofmixedchaoticmapsserveassecretkeys,whichisconvenientforthekeymanagementandtransmission.Moreover,italsopossesseshighresistanceagainststatisticalattack,brute-forceattack,noiseattackandshearattack.Simulationresultsandsecurityanalysisverifythevalidityandsecurityoftheproposedencryptionscheme.

  • 标签: Image ENCRYPTION MIXED CHAOTIC MAPS Digital