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500 个结果
  • 简介:Manyapproachesforhigh-resolutionimagereconstructionhavebeenproposedinsomeliteratures.Oneofthemostcommonlywaysistoreconstructahigh-resolutionimagefromanumberofrotatedandtranslatedimageswithlowresolution.Inthisprocess,theexposuredifferenceamongoriginalimageswilldecreasethequalityofthereconstructedimage.Inordertoremovetheinfluenceoftheexposuredifference,alightenergymatchingmethodisproposedinthispaper.Thetheoreticalanalysisisillustratedindetails.Experimentalresultsshowthatthetheoreticalanalysisiscorrectandtheproposedmethodisvalid.

  • 标签: 高分辨率图像重建 图像处理 光能匹配法 数字成像技术 CCD 电荷耦合器件
  • 简介:Heat-resistantsiliconegelsweresynthesizedbyreplacingthesinglemainchainpolymethylhydrosiloxanewithreactiveladderlikepolyhydrosilsesquioxanecopolymers.Becauseoftheinteractionbetweenpolydimethylsiloxanechainsandtheladderlikepolysilsesquioxaneschains,thecyclizationofthepolydimethylsiloxanechainsishindered.Thehighthermalstabilityoftheladderlikepolymerscanimprovethethermalstabilityofthesiliconegelswithoutsacrificingtheirgoodcomprehensiveproperties.

  • 标签: HEAT-RESISTANT Silicone GELS Ladderlike POLYSILSESQUIOXANE Interaction
  • 简介:Afterfouryears'extensivelyscramblingrivers'exploitationrightsbypowercompanies,thecountablehydropowerresourcesarealmostsharedup.Inwater-abundantsouthwesternregion,fivelargegenerationgroupsdelimitedtheirownspheresonlargerivers.Sharpprivateenterprisesavailedthemselvesofeveryopportunitytograspthetargetsonsmallandmediumrivers.Asnumerousinvestorsswarmed,hydropowerconstructionenteredarealhightideperiod.'Atpresent,theproportionofexploitedhydroenergyisapproximately20%oftheexploitablewaterenergyinChina.Itwillbeenoughforthedatumtobecloseto60%inChina,otherwisemoreproblemswithecologicalenvironmentwouldfollow.Thehydropowertobedevelopedshallbelimitedwithin350GW,andthisisthetop,'saidWangShucheng,MinisterofMinistryofWaterResources.'Excessivemarketizationislikelytoleadendlesstroubleinhydropowerconstruction.Incasetheinvestmentinahydropowerprojectfails,thedestroytoecologicalenvironmentareverydifficulttoberestored,'saidPengTubiao,chiefengineerfromChinaHydropowerandWaterResourcesPlanningandDesigninstitute.

  • 标签: 电力工业 水电 投资 水利资源 开发权
  • 简介:目的:提高高职类体育院校推拿手法学的教学质量。方法:进行了多项教学改革,包括按认知规律重新安排教学内容,引入PBL教学理念,改善教学条件,增加了多媒体及实践教学,丰富了教学资源,改革了考核评价方案等。结果与结论:通过各项改革,学生不仅学到了专业技能,还提高了分析、解决问题的能力。

  • 标签: 推拿 按摩 教育改革 教学方法 多媒体
  • 简介:Thepurposeofthispaperistodevelopahighspeeddetectionschemeformovingand/orstationarypointtargetsinamultitargetenvironmentasregisteredinanIRimagesequence.Aniterativeapproximate3-Dlinesearchingalgorithmbaseduponthegeometricrepresentationoflines(fornon-maneuveringtargetsinspace)ina3-Dspaceisderived.Theconvergencyofthealgorithmisproved.Ananalysisisperformedofthetheoreticaldetectionperformanceofthealgorithm.ThestatisticalexperimentresultsshowhigheffectivenessandcomputationalefficiencyofthealgorithminthecaseoflowSNR.Theideamaybeemployedtosatisfythereal-timeprocessingrequirementofanIRsystem.

  • 标签: Point TARGET THREE-DIMENSIONAL space(3-D space) ITERATIVE
  • 简介:摘要:竞赛是教学活动的一种,它运用了“三S”心理控制法:惊异(surprise)、悬念(suspension)、满足(satisfaction)。竞赛能最大程度的调动班级学生的积极性,挖掘学生的潜能。通过竞赛的方式,学生的视觉,听觉,感觉全面的被调动起来。学生全身心的投入课堂学习,从而在竞赛中获得胜利。在竞赛的过程中,传统的封闭式课堂教学转变为主动活泼的开放式课堂。沉闷的课堂被点燃,瞬间high了起来。

  • 标签: 竞赛 英语课堂 合作学习
  • 简介:In2003theinternalandexternalenvironmentsofChina′sforeigntradearebetterthanthosclastycar,butsomerestrictionsstillremain.Itisratherdiffieultforexportgrowthratetokeepashighaslastyear,butthere,arestillalotofbeneficialelementsforimportandexporttoachievearelativelyhighgrowthrate,

  • 标签: 中国 进出口贸易 发展现状 国内形势 国际贸易形势 发展趋势
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  • 简介:Thecombustion(ballistic)propertiesofahighsolidloadingcompositesolidpropellantfamily(Butalites)wasstudiedexperimentallybyusingpropellantformulationsbasedonhydroxy-terminatedpolybutadienepre-polymer(HTPB)asafuelbindermainbackbone,bi-modalsystemammoniumperchlorateoxidizer(AP)andaluminumpowder(Al)asmetallicfuel.Burningratesweredoubledatvariouspressures,whensolidsloading(APand17%Al)wereincreasedfrom80to88%andthemeasuredcharacteristicvelocityvalueswereincreasedbyabout100m/sec.Thepressureexponent(n)valueswerelowerwith80-85%solidsloading.Theburningrateswereincreasedbyabout2-5%whencomparingthedataobtainedbystaticfiringwiththoseobtainedbythestrandburnermethod.

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  • 简介:Thehighresolutionradartargetdetectionisaddressedinthenon-Gaussianclutter.Anadaptivedetectorisderivedforrange-spreadtargetbasedonanovelcovariancematrixestimator.Itisprovedthatthenewdetectorisconstantfalsealarmrate(CFAR)tobothofthecluttercovariancematrixstructureandpowerleveltheoreticallyformatchcases.ThesimulationresultsshowthatthenewdetectorisalmostCFARformismatchcases,anditoutperformstheexistingadaptivedetectorbasedonthesamplecovariancematrix.Italsoshowsthatthedetectionperformanceimproves,asthenumberofpulses,thenumberofsecondarydataortheclutterspikeincreases.Inaddition,thederiveddetectorisrobusttodifferentsubsets,estimatedcluttergroupsizesandcorrelationsofclutter.Importantly,thenumberofiterationsforpracticalapplicationisjustone.

  • 标签: 自适应检测器 雷达目标检测 高分辨率 性能评估 协方差矩阵 高斯杂波
  • 简介:Recentresearchactivitiesrelevanttohighenergydensityphysics(HEDP)drivenbytheheavyionbeamattheInstituteofModernPhysics,ChineseAcademyofSciencesarepresented.RadiographyofstaticobjectswiththefastextractedhighenergycarbonionbeamfromtheCoolingStorageRingisdiscussed.Investigationofthelowenergyheavyionbeamandplasmainteractionisreported.WithHEDPresearchasoneofthemaingoals,theprojectHIAF(HighIntensityheavy-ionAcceleratorFacility),proposedbytheInstituteofModernPhysicsasthe12thfive-year-planofChina,isintroduced.

  • 标签: heavy ION BEAM high energy density
  • 简介:一个信号处理方法为高速度在水下图象的声学的传播被介绍。它有二部分。第1部分介绍信号处理为在水下声学的协调通讯。第1部分包括3个技术的点。(1)Doppler移动compensation.Chirp信号在数据包裹之间被插入。在二个拷贝关联函数之间的关联进程给吝啬的Doppler移动的更多的精确评价。然后,它能被采样补偿数据。在适应决定反馈均衡器(DFE)一个适应阶段赔偿者与快,自我优化的最不吝啬的广场(FOLMS)改编算法被利用与第二顺序阶段锁环算法比赔偿者导致更好的运动忍耐。吝啬的Doppler移动赔偿和适应阶段赔偿者的联合的表演相当好。(2)差异combiner(DC)在均衡器之前使用了。combiner和适应DFE基于FOLMS改编算法。这导致减少的计算复杂性和更好的性能。(3)串联了均衡器,涡轮架子编码了调整(TCM)解码器和重复算法。一个新bitsymbol变换器基于软产量Viterbi算法(SOVA)被学习。与传统的决定作比较,编码并且印射算法,在将近2的新变换器罐头还原剂小点错误率(BER)订。第2部分主要在一个柔韧的图象压缩算法附近。基于分离小浪变换并且修理了长度编码,为声学的图象的一个柔韧的压缩算法被学习。算法包括4个技术的点。(1)利用小浪基于转变图象的CDF9/7。(2)分析subband系数的精力分发。合适的转变层数字是3。(3)根据他们的精力分发把不同量子化步用于不同subbands。(4)使用修理了长度编码阻止错误繁殖。结果证明算法在图象质量,压缩率,和大多数之中完成平衡重要,坚韧性到BER。灰色的规模的压缩的位率声学的图象是0.85小点/象素。当BER比10-3低时,图象质量仍然保持好。当BER起床到10-2时,在那里削减一些小脏点。基于提及的上面的信号处理技术,一在水下声学的通讯系统是运作的频率乐队是的

  • 标签: 信号处理 水下声音信号传输 图像 多普勒移位补偿
  • 简介:散开的磁性和微观结构退火了[Ta/Nd/NdFeB/Nd/Ta]薄电影被调查了。这些电影被在为10min的650℃退火与Nd/NdFeB层(R=0~3.3)的各种各样的厚度比率在Si底层上扔,然后扩散了并且结晶。没有Nd层的电影显示出软磁性的行为和a-Fe阶段的高内容。有R的电影>=1与大约20kOe的高coercivity显示出好难磁性。

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  • 简介:Inthepresentpaper,anonlinearmulti“actuatordisk”modelisproposedtoanalyzethedynamicbehaviorofflowinstabilities,includingrotatingstallandsurge,inhighspeedmultistageaxialcompressors.Themodeldescribestheductflowfieldsusingtwodimensional,compressibleandunsteadyEulerequations,andaccountsfortheinfluencesofdownstreamplenumandthrottleinthesystemaswell.Itreplaceseachbladerowofmultistagecompressorewithadisk.Fornumericalcalculations,thetimemarchingprocedure,usingMacCormacktwostepsscheme,isused.Themainpuposeofthispaperistopredictthemechanismoftwodimensionalshortwavelengthrotatingstallinceptionandtheinterationbetweenbladerowsinhighspeedmultistagecompressors.Ithasbeendemonstratedthatthemodelhastheabilitytopredictthosephenomena,andtheresultsshowthatsomesystemparametershaveastrongeffectonthestallfeaturesaswell.Resultsforafivestagehighspeedcompressorareanalyzedindetail,andcomparisonwiththeexperimentaldatademonstratesthatthemodelandcalculatingresultsarereliable.

  • 标签: 压缩机 流体不稳定性 数字模拟