简介：利用1981—2015年沈阳地区7个气象站的日观测数据,通过CLIGEN（ClimateGenerater）天气发生器模拟沈阳地区日降水序列数据,并统计模拟日降水量、月降水量、年降水量及年最大日降水量,利用平均值、标准差、偏度及峰度对CLIGEN天气发生器模拟的沈阳地区降水进行适用性评价。结果表明：CLIGEN天气发生器对沈阳地区日降水量、月降水量和年降水量平均值的模拟效果较好,模拟降水量的平均相对误差绝对值（MeanAbsoluteRelativeError,MARE）分别为2.1%、1.3%和3.3%,年最大日降水量的模拟精度稍差。对于降水最大值方面,CLIGEN天气发生器对沈阳地区日最大降水量和年最大降水量的模拟效果较差,模拟的日最大降水量和年最大降�

简介：本研究从浙江某高校2015级大学生中选取学业不良组和学业优良组,在大一期间进行了两次人格特质与生命意义感的测量,发现人格的尽责性、生命意义感都和学业成绩呈显著正相关,学业不良组与学业优良组大学生人格的开放性和尽责性、生命意义感差异显著。研究结果说明人格的尽责性和生命意义感是大学生学业成绩的预测指标。进入大学后,学业不良组和学业优良组大学生人格的尽责性和生命意义感发生了变化,导致了学业成绩的差异。

简介：地球和月球岩石具有相似的难熔元素含量和同位素组成,但是月球岩石却有比地球地幔亏损的挥发性元素并且富集这些元素的重同位素,这表明月球经历过挥发分的丢失。但是在丢失过程中是否平衡,以及在什么条件下平衡目前仍然存在疑问。

简介：MostcurrentprestackAVAjointinversionmethodsarebasedontheexactZoeppritzequationanditsvariousapproximations.However,theseequationsonlyreflecttherelationbetweenreflectioncoefficients,incidenceangles,andelasticparametersoneithersideoftheinterface,whichmeansthatwave-propagationeffects,suchassphericalspreading,attenuation,transmissionloss,multiples,andeventmismatchingofP-andS-waves,arenotconsideredandcannotaccuratelydescribethetruepropagationcharacteristicsofseismicwaves.ConventionalAVAinversionmethodsrequirethatthesewave-propagationeffectshavebeenfullycorrectedorattenuatedbeforeinversionbuttheserequirementscanhardlybesatisfiedinpractice.Usingaone-dimensional(1D)earthmodel,thereflectivitymethodcansimulatethefullwavefieldresponseofseismicwaves.Therefore,weproposeanonlinearmulticomponentprestackAVAjointinversionmethodbasedonthevectorizedreflectivitymethod,whichusesafastnondominatedsortinggeneticalgorithm(NSGAII)tooptimizethenonlinearmultiobjectivefunctiontoestimatemultipleparameters,suchasP-wavevelocity,S-wavevelocity,anddensity.Thisapproachisrobustbecauseitcansimultaneouslycopewithmorethanoneobjectivefunctionwithoutintroducingweightcoefficients.Modeltestsprovetheeffectivenessoftheproposedinversionmethod.Basedontheinversionresults,wefindthatthenonlinearprestackAVAjointinversionusingthereflectivitymethodyieldsmoreaccurateinversionresultsthantheinversionbyusingtheexactZoeppritzequationwhenthewave-propagationeffectsoftransmissionlossandinternalmultiplesarenotcompletelycorrected.

简介：南淝河称之为合肥市的母亲河。为了确保河道工程安全运行,全面、客观地了解工程现状及存在的隐患,并为安全鉴定及结构复核计算等工作提供一线技术资料,对河道的土质边坡采用高密度电阻率法进行勘查。对勘查存在隐患的部位提出了工程验征,验证结果表明,低阻异常是含水细沙层或粉质淤泥层,证实了高密度电阻率法推断的结论。

简介：Anewmulti-moderesistivityimagingsonde,withtoroidalcoilsassource,canconductthreeresistivitymeasurements:azimuthalresistivity,lateralresistivity,andbitresistivitymeasurements.Thus,theloggingtimeandcostaregreatlysaved.Thetoroidalcoilsaresimplifiedasanextendedvoltagedipoleandtheresponseequationsarederivedforahomogenousformation.Basedon3DFEM,thedepthofinvestigation(DOI),verticalresolution,circumferentialazimuthalcapacity,boreholediameter,mudresistivity,thicknessoftargetformation,andtheresistivityofthesurroundingformationandmudinvasionaresimulated.TheresultssuggestthatthethreemeasurementmodesofthenewsondearedifferentinverticalresolutionsandDOIs.Thecircumferentialdetectionabilityoftheazimuthbuttondependsonthecontrastbetweentheanomalyandformationresistivityandtheopenangleoftheanomaly.Whethertheboreholeistruncatedatthebitornothasagreatinfluenceonthesimulationresults.Theboreholeandmudinvasionaffecttheapparentresistivityinallmodes,buttheeffectsofresistivityofsurroundingformationandthicknessofthetargetformationareonlycorrectedforlateralresistivitymeasurement.

简介：这份报告汇编了由采自得克萨斯州西部和新墨西哥州东南部二叠盆地内74口井的钻屑样品分析所得镜质体反射率数据（R0）（图1）。每口井测定的镜质体反射率数据量为3到24个不等，这些数据反映了各井不同深度地层段的成熟度。这些年龄介于寒武一奥陶纪至白垩纪之间的样品的采样深度为200fl到22100fl不等。