简介：Anopen-endedcoaxiallinereflectionmethodespeciallysuitableformeas-uringthedielectricpropertiesofbiologicaltissueinvivoisdescribed.Thismethodofferstheadvantageofnotrequiringanyspecialpreparationofthesamplestobemeasuredbutaclosecontactwiththeopenendofacoaxialline.Itis,therefore,veryconvenienttoacquirealargenumberofmeasurementdatainbroadbandrapidly.Themethodmayalsobeusedtomeasurethepropertiesofothersubstances.ThemeasuringsystemconsistsofanetworkanalyzercontrolledbyamicrocomputerandcalibratedbyusingANAproceduretoelimi-hatetheinflunceoferrornetworkintroducedbytheadapter,someconnectors,etc.Inor-dertoreachhigheraccuracy,theiterativemethodisusedtodeterminetheparametersoftheequivalentcircuit.Measurementsofpermeativitiesofsomelivingtissueshavebeenper-formedinthefrequencybandof0.5-2GHz.Comparedwiththeresultsknowninsomepapers,thevalidityofthismethodhasbeenconfirmed.Thedifferenceindielectricproper-tiesbetweenlivinganddeadtissues,andthetissuepermeativites(ε)versusfrequencyanddurationofmeasurementafterdeathhavealsobeenmeasured.

简介：Tosharpentheimagingofstructures,itisvitaltodevelopaconvenientandefficientquantitativealgorithmoftheopticalcoherencetomography(OCT)sampling.InthispaperanewMonteCarlomodelissetupandhowlightpropagatesinbio-tissueisanalyzedinvirtueofmathematicsandphysicsequations.Therelations,inwhichlightintensityofClassIandClass2lightwithdifferentwavelengthschangeswiththeirpermeationdepth,andinwhichClassIlightintensity(signallightintensity)changeswiththeprobingdepth,andinwhichangularlyresolveddiffusereflectanceanddiffusetransmittancechangewiththeexitingangle,arestudied.TheresultsshowthatMonteCarlosimulationresultsareconsistentwiththetheorydata.

简介：在液相的质传上的Marangoni传送对流和它的影响被调查。Marangoni传送对流用激光Schlieren技术被设想。有序的多角形的传送对流模式和随机的界面的骚乱被观察。质传率上的效果ofMarangoni传送对流被使放出学习从在掉落的电影的水溶液的乙醇。试验性的结果证明那Marangoni传送对流能加快表面更新并且在液相提高质传率。液体传质系数能被差不多3褶层提高。相应实验关联以质传改进因素被给。在考虑Marangonieffect，而且，常规质传关联被修改。关联和试验性的数据预言的价值之间的差别在±8.2%以内，平均差别是4.2%。

简介：通过对无线传感器网络WSN中的非测距定位（Range—free）技术进行分析，阐述非测距定位技术的基本思想，并对一些经典的非测距定位技术进行研究与比较。首先，阐述WSN中非测距定位技术的主要思想；其次，分析和比较一些典型的非测距定位技术；最后，分析非测距定位技术的研究现状与发展趋势。

简介：Toimproveglobalcontrolofdiseaseandreduceglobaltoxicity,acomplexseeddistributionpatternshouldbeachievedwithgreataccuracyduringbrachytherapy.However,theinteractionbetweentheneedleandprostatewillcauselargedeformationofsofttissue.Asaresult,seedswillbemisplaced,sharpdemarcationbetweenirradiatedvolumeandhealthystructuresisunavailableandthiswillcausesideeffectssuchasimpotenceandurinaryincontinence.Inthispaper,a3Dnonlineardynamicfiniteelements...

简介：Weconductedatransientexperimentalinvestigationofsteam–waterdirectcontactcondensationintheabsenceofnoncondensiblegasinalaboratory-scalecolumnwiththeinnerdiameterof325mmandtheheightof1045mm.Weappliedanewanalysismethodforthesteamstateequationtoanalyzethemolarquantitychangeinsteamoverthecourseoftheexperimentanddeterminedthetransientsteamvariation.Wealsoinvestigatedtheinfluenceofflowratesandtemperaturesofcoolingwaterontheefficiencyofsteamcondensation.Ourexperimentalresultsshowthatappropriateincreasingofthecoolingwaterflowratecansignificantlyacceleratethesteamcondensation.Weachievedarapidincreaseinthetotalvolumetricheattransfercoefficientbyincreasingtheflowrateofcoolingwater,whichindicatedahigherthermalconvectionbetweenthesteamandthecoolingwaterwithhigherflowrates.Wefoundthatthetemperatureofcoolingwaterdidnotplayanimportantroleonsteamcondensation.Thismethodwasconfirmedtobeeffectiveforrapidrecoveringofsteam.

简介：这研究通过数字模拟在一个圆形的热exchanger试管调查了热转移和一个种swirl发电机的流动特征。这类swirl发电机导致的swirl流动能与最小的压力落下惩罚获得高热转移率。模拟被执行理解这种mesoscale热改进部件的物理行为。由设想热转移和流动特征，swirl流动被导致由，这被发现打漩在圆形的试管的生成器结合侵犯的喷气效果。在通过swirl生成器以后，液体的本地磨擦因素能快速更快速回到底层，当本地Nusselt数字为距离维持更高的值时；因此，本地性能的评估标准被改进。单个因素的优化被用于三个几何参数，即，角度打漩生成器(25o，45o，和60o)，长度打漩发电机(0.005，0.01，和0.02?m)，并且中心杆半径(1，2，并且3?公里)。为在一个圆形的试管的空气的laminar流动的swirl生成器的最佳参数被获得，它应该是60o，0.005?m，并且3?公里分别地。

简介：微尺寸的试管热exchanger(MTHE)被制作，并且它在转移和压力掉的发情的表演试验性地被学习。MTHE试管的方面上的单相的强迫的传送对流热转移关联被建议并且与在雷纳兹数字的以前的试验性的数据相比变化5001800。在计算Nusselt数字的关联的平均偏差是大约6.59%。在热入口区域的入口效果被讨论。在雷纳兹数字的一样的范围，压力落下和磨擦系数被发现比常规关联预言的那些更加高。磨擦因素和雷纳兹数字的产品也高是一个常数，而是大部分比常规。

简介：Thispaperprovidesanumericalanalysismodelofunsteadyheattrans-ferinpiston-linersetofaninternalcombustionengine.Themodelsimulatestheun-steadyheattransferprocessamongthecombustionmixture,pistonset,lubricantfilm,linerandcoolantinawholeenginecycle,andcanpredictthetemperaturefluc-tuationanddistributiononpistoncrown,innersurfaceofliner,pistonringandthelubricantfilm.Acomputerprogramisdevelopedtocalculatetheunsteadyheattrans-ferprocessofpiston-linersysteminawater-cooleddieselengine.