简介:一、启发提问在统计初步中,如果要研究一组数据平均水平或集中趋势,则只需研究这组数据的.如果要研究一组数据的波动大小,则要研究这组数据的或;如果还要研究在哪一个范围内的数据较多,在哪一个范围内的数据较少,这就需要研究这组数据的.二、读书自学 教材P185-P189三、启读指导1.获得一组数据的频率分布的一般步骤是:(1),(2),(3),(4),(5),(6).2.在P185例中,这组数据的最大值是,最小值是,它们的差是cm.3.当数据在100个以内时.按照数据的多少,常分成组.这是分组的经验法则.4.组距是指每个小组的两个端点的.5.实际决定组数时,常有一个尝试的过程;先定,再算出相应的,再看
简介:[篇名]ACIVILENGINEERINGMATERIALSCOURSEWAREWITHAVIRTUALLABORATORY,[篇名]Acompactsledsystemforlinearimpact,poleimpact,andsideimpacttesting,[篇名]ADynamicTestProcedureForAdhesivelyBondedComposite,[篇名]Alow-cost,high-performanceimpacttestfacility,[篇名]Amethodologyfortheidentificationofconstitutiveandcontactlawsofmetallicmaterialsunderhighstrainrates,[篇名]Amicro/macroimpacttestatcontrolledenergyforerosionandphase-transformationsimulation,[篇名]Aproactivesystemapproachtoautomotiveimpactdevelopment,[篇名]Astudyonfracturesurfaceofagedturbinerotorsteelbyfractaldimension,[篇名]AstudyonthedeterminationoffractureparametersfortherubbertoughenedpolymericmaterialswiththeinstrumentedCharpyimpacttest,[篇名]Anexaminationofthetaylorimpactproblemforexperimentsinvolvingsquareandcircularrods,[篇名]AnalysisoftestdataobtainedformCharpyVandimpacttensiletest,[篇名]Assessingthebeddingconditionsofsewerpipesusingeigenvibration,[篇名]Bucklingbehavioranalysisofarectangulartubestructurebylateralimpactload,[篇名]CHARACTERISTICEVALUATIONOFCFRPCOMPOSITESUNDERFALLINGWEIGHTIMPACTLOADING。
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简介:在72届SEG会上,BP公司LindaHodgson等人提出了一种新的噪声压制方法——频率切片滤波(FSF)。在复杂的X-Y频率域中,FSF应用二维平滑滤波器直接去噪。它可以任意选择特定的频率处理范围进行有针对性的滤波,而数据的其余部分不受影响;任何适合于空间滤波的噪声都能够去除,特别是低频噪声的消除和剩余多次波能量的衰减。具体实施过程分为4个步骤:①应用一维快速傅立叶变换到目的层时窗;②检查X-Y频率域数据体,确定频率范围,有针对性地进行噪声衰减;③在每一个频率切片上进行平滑处理,数据的其余部分不改变;④进行傅立叶逆变换,得到滤波结果。以下选取北海2个油田的实例展示其良好的滤波效果。