简介：Thestrengthoflightweightconcreteundertriaxialcompressivestressisstudiedexperimentallywiththeconcretetriaxialapparatusdesignedbytheauthors,andiscomparedwiththatofnormalconcreteunderthesamestressstate.Ninety-five100mmcubesundertwentystressratiosaretested.Ascomparedwithnormalconcrete,itisfoundthatnotonlythemultiaxialcompressivestrengthoflightweightconcreteissmall,butalsotheratioofthemultiaxialcompressivestrengthtotheuniaxialcompressivestrengthissmall.Theinfluenceoftheintermediateprincipalstressonthemultiaxialstrengthoflightweightconcreteisdiscussed.Thestrengthcriteriawhichareexpressedintheprincipalstressesandtheoctahedralstressesrespectivelyareproposed.

简介：高压缩比率，高译码性能，和进步数据传播是为WebGIS的向量数据压缩算法的最重要的要求。满足这些要求，我们在场一条新压缩途径。这篇论文由把漂流坐标变换成整数坐标以多尺度的数据的产生开始。在屏幕上的变换的点和原来的点之间的距离在2个象素以内，这被证明，因此，我们的途径对顾客方面上的向量数据的可视化合适。整数坐标被传递给一个整数小浪变压器，并且高周波的系数由变压器生产了被正规哈夫曼代码编码。河数据和道路数据上的试验性的结果表明建议途径的有效性：为河数据的压缩比率罐头活动范围10%和20%为道路数据分别地。我们断定更多的注意需要被付到在包含一些点的弯曲之间的关联。

简介：Inthispaper,thetechniqueofquasi-losslesscompressionbasedontheimagerestorationispresented.Thetechniqueofcompressiondescribedinthepaperincludesthreesteps,namelybitcompression,correlationremovingandimagerestorationbasedonthetheoryofmodulationtransferfunction(MTF).Thequasi-losslesscompressioncomestoahighspeed.Thequalityofthereconstructionimageunderrestorationisuptoparofthequasi-losslesswithhighercompressionratio.TheexperimentsoftheTMandSPOTimagesshowthatthetechniqueisreasonableandapplicable.

简介：Duetothelargescaleandcomplexityofcivilinfrastructures,structuralhealthmonitoringtypicallyrequiresasubstantialnumberofsensors,whichconsequentlygeneratehugevolumesofsensordata.Innovativesensordatacompressiontechniquesarehighlydesiredtofacilitateefficientdatastorageandremoteretrievalofsensordata.ThispaperpresentsavibrationsensordatacompressionalgorithmbasedontheDifferentialPulseCodeModulation(DPCM)methodandtheconsiderationofeffectsofsignaldistortionduetolossydatacompressiononstructuralsystemidentification.TheDPCMsystemconcernedconsistsoftwoprimarycomponents:linearpredictorandquantizer.FortheDPCMsystemconsideredinthisstudy,theLeastSquaremethodisusedtoderivethelinearpredictorcoefficientsandJayantquantizerisusedforscalarquantization.A5-DOFmodelstructureisusedastheprototypestructureinnumericalstudy.NumericalsimulationwascarriedouttostudytheperformanceoftheproposedDPCM-baseddatacompressionalgorithmaswellasitseffectontheaccuracyofstructuralidentificationincludingmodalparametersandsecondorderstructuralparameterssuchasstiffnessanddampingcoefficients.ItisfoundthattheDPCM-basedsensordatacompressionmethodiscapableofreducingtherawsensordatasizetoasignificantextentwhilehavingaminoreffectonthemodalparametersaswellassecondorderstructuralparametersidentifiedfromreconstructedsensordata.

简介：Calc-alkalinegranites(excludingA-andM-type)couldbedividedintotwopetrogenicseries,I,e,thesyntexisseriesandthetransformationseriesaccordingtotheirgeneticmechanisms.InthelightofthisclassificationwefoundthatgranitesofthesetwoseriesoftenaligneinpairedzonesparalleltocontemporaneousB-typeorintracontinentalcompression-subductionzoneswithinascendedslabs,re-sultinginaregularzonalpatterntogetherwithsubductionzones.Thus,theyaredefinedastwingranitebelts.Accordingtothespatialrelationsbetweenthegranitebeltsandthesubductionzones,thetwingranitebeltscouldbeclassifiedasA,ABandB-type.ThezonationofgranitesofthetwoseriesinthenorthernpartoftheEastQinlinareacouldbecitedasatypicalexampleofA-typetwingranitebeltsrelatedtotheYenshanianintracontinentacompression-subductionmovementinthearea.InthispaperthetectonicsettingsandpetrogenicfeaturesofthetwingranitesbeltsinEastQinlinaresystematicallydescribed,andatectonicmodelforgraniticmagmagenesisinintracontinentalcompression-subductionenvironmentshasbeenproposed.Inthismodeltheforma-tionofA-typetwingranitebeltsiscloselyconnectedwithtectonicmovementsintermsoftheprince-ple,ruleanddynamicsofmaterialdifferentiationinthelithosphere.