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简介：摘 要 宁德站改工程施工中大胆采用常规大型工程设备，并对该部分设备进行适当的专业化改造，与以往的拨接施工相比，大大地缩减了拨接作业人员数量，提高了工效，摒弃传统拨接施工中的人海战术，在有限的封锁时间内赢得了更多的工作时间和节约了成本，保质保量的达到开通条件。

简介：通过对2004年3月16～18日这一次寒潮天气过程的分析,以提高在类似天气形势下寒潮天气预报的能力.

简介：Inthispaper,wedeterminedanearthquakesequencelocationintheXingfengjiangareafromJune,2007toJuly,2014andthe3DP-wavevelocitystructurebyasimultaneousinversionmethod.Onthatbasis,westudiedtheoccurrencefeaturesofactivetectonicsandtheearthquakesourcemechanism.Theresultsshowthatthereservoirfracturesystemhasatendencytoincreasewithgradualdepthfromsoutheasttonorthwest,consistentwithgravitationalfieldresearchresults.Thereare4highvelocityzones(HVZ)underthedepthofthe7km-12kmcrustbetweentheXinfengjiangReservoirdamandXichangDistrict,Dongyuan.ThemaxvelocityofthebiggestHVZwhichisunderXichangis6.3km/s.Underthereservoirdamthereisastrongtectonicdeformationzone,asthecenterexitRenzishifault(F2),Nanshan-Aotoufaults(F4),Heyuanfault(F1)andShijiao-Xingang-Baitianfault(F5),7earthquakeswithML≥5.0(includingM6.1inMarch,1962)occurredatthehighgradientzoneoftheHVZⅢandHVZⅣedgewhichhasbeenunderthereservoirdamsince1960,withrelativityenergyreleasingmorethoroughly.ModerateseismicactivityoccurredattheHVZⅠedgewhichhasbeenunderXichangsince2012,andisadangerzoneforM5.0earthquakesinthefuture.

简介：对于遥测与储层表征有关的性质和开采油气来说，必须了解复杂储层的地震响应。本文说明把岩石物理和地震模拟相结合了解含有垂直裂缝的含油气储层的地震响应。本文用粘弹性和各向异性模拟主要研究P-P和P-S波AVO特征波形，并且把这些特征波形与用较简单模拟方法得到的结果进行比较。得出的一般结论是，当地震排列与裂缝方向形成角度时，使用各向异性和粘弹性模拟看来似乎是重要的。

简介：【摘要】页岩气属于非常规的天然气资源，我国在页岩气勘探、开发方面近年取得了重大突破，储量丰富的页岩气资源有助于缓解长期以来的能源短缺矛盾，推动新型能源体系建设进程。本文简述了国内页岩气资源的开采现状、所存问题，提出打破技术设备瓶颈、控制勘探开采成本、开展对深层及非海相页岩气等项目的攻关研究等策略，意在推进页岩气这种清洁能源早日成为国内常规能源的替代品。

简介：选取三江平原典型沼泽湿地——毛苔草沼泽，通过人工施加氮肥和磷肥来模拟农田污水排入沼泽湿地后，沼泽植物对污水的净化效果。从植物营养吸收角度进行野外实地污水净化模拟研究，对植物直接吸收利用的营养成分NH4^+-N、PO4^3--P进行了测试分析。研究表明毛苔草沼泽对水中的NH4^+-N、PO4^3--P的净化随时间的推移呈现明显的指数衰减下降趋势，随着氮、磷含量的增加，沼泽湿地对污水净化逐渐变慢，净化所需时间增长，曲线数值方程模拟效果较好。

简介：本文的基础是挪威初探井评价项目。这里概括了前面三篇论文的主要认识，目的是为改进勘探过程提供建议。这方面的主要建议有：·勘探目标应在含油气系统和成藏层带的背景下进行评价。·为了提高对油气体积不确定性的了解，应采用勘探目标的平面和垂向分块，同时在钻探以前对勘探目标的油气体积进行多种计算。·如果探井是干井，应使用决策树来确定干井原因。·要了解油气体积和勘探目标概率之间的联系。·确保勘探目标评价过程的一致性。·在为勘探目标的不同评价阶段提供报告时，应致力于形成无间隔的数据源链条。·勘探目标的评价应考虑其成藏层带的勘探成熟程度。·应不断更新挪威初探井评价数据库。

简介：银河系中的巨分子复合体,例如CepOB3分子云,在其星际分子的射电谱线成图时表现出成团块的现象。利用它们的物理参数以及维里理论研究了CepOB3分子云C18O(J=1-0)团块的动力学稳定性。计算结果表明:除L1211的C18O(J=1-0)团块外,其它所有的C18O(J=1-0)团块都存在关系式PextPmax和RminR。也就是说除L1211的C18O(J=1-0)团块外,其它所有的C18O(J=1-0)团块均是动力学稳定的。由此可信在L1211的C18O(J=10)团块中存在恒星形成过程。

简介：Ｄｉｓｔｒｉｂｕｔｉｏｎａｌｆｅａｔｕｒｅｓｏｆδ１８ＯｉｎｐｒｅｃｉｐｉｔａｔｉｏｎｉｎＣｈｉｎａＺＨＡＮＧＸｉｎｐｉｎｇＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｇｒａｐｈｙ，ＨｕｎａｎＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，Ｃｈａｎｇｓｈａ４１００８１ＣＨＩＮＡ...

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简介：采用分级测定的方法对梁子湖沉积物中无机磷酸盐进行了分析,测定了梁子湖水体P的季节变化,并以室内模拟的方法研究梁子湖沉积物在pH值和温度控制下P的释放特征.研究表明,梁子湖水体P的含量呈明显的季节变化,冬季高,夏季低.沉积物无机磷（Pi）中以钙磷（Ca-P）为主（55%～61%）,铁磷（Fe-P）次之（28%～33%）,铝磷（Al-P）最少（3%～5%）.在梁子湖的入水口和出水口,由于沉积环境影响到P的形态,P的释放明显较湖心高.在试验初期,由于扰动的影响,使得P的释放在第1天比第2天和第3天高,其后P的释放量则迅速增加.温度对P释放影响明显,其具体表现为,30℃时P释放达到峰值的时间比4℃时提前4d,而且前者峰值比后者高出9倍.pH值对沉积物P释放同样有明显的影响,与正常状态下的湖水条件（pH值为8.5）相比,偏酸（pH值为5.5）和偏碱（pH值为11.5）条件下,P的释放量增加.

简介：ThreesamplingcrosssectionsalongthesouthpathstartingfromtheTropicsthroughthevaporpassageintheYunnan-GuizhouPlateautothemiddle-lowreachesoftheYangtzeRiver,thenorthpathfromWestChina,viaNorthChina,toJapanunderthewesterlies,andtheplateaupathfromSouthAsiaovertheHimalayastothenorthernTibetanPlateau,aresetup,basedontheIAEA(InternationalAtomicEnergyAgency)/WMOglobalsurveynetworkandsamplingsitesontheTibetanPlateau.Thevariations,andtherelationshipwithprecipitationandtemperature,oftheδ18Oinprecipitationalongthethreecrosssectionsareanalyzedandcompared.Alongthesouthpath,theseasonaldifferencesofmeanδ18OinprecipitationaresmallatthestationslocatedintheTropics,butincreasemarkedlyfromBangkoktowardsthenorth,withtheδ18Ointherainyseasonsmallerthaninthedryseason.Theδ18Ovaluesinprecipitationfluctuateonthewhole,whichshowsthattherearedifferentvaporsources.Alongthenorthpath,theseasonaldifferencesofthemeanδ18OinprecipitationforthestationsinthewestofZhengzhouareallgreaterthanintheeastofZhengzhou.Duringthecoldhalfoftheyear,themeanδ18OinprecipitationreachesitsminimumatUrumqiwiththelowesttemperatureduetothewide,coldhighpressureoverMongolia,thenincreasesgraduallywithlongitude,andremainsatroughlythesamelevelatthestationseastwardfromZhengzhou.Duringthewarmhalfoftheyear,theδ18Ovaluesinprecipitationarelowerintheeastthaninthewest,markedlyinfluencedbythesummermonsoonoverEastAsia.Alongtheplateaupath,themeanδ18OvaluesinprecipitationintherainyseasonarecorrespondinglyhighinthesouthernpartsoftheIndiansubcontinent,andthendecreasegraduallywithlatitude.Asharpdepletionofthestableisotopiccompositionsinprecipitationtakesplaceduetotheverystrongrainoutofthestableisotopiccompositionsinvaporintheprocessofliftingoverthesouthernslopeo

简介：Adetailthree-dimensionalPwavevelocitystructureofBeijing,TianjinandTangshanarea(BTTarea)wasdeterminedbyinvertinglocalearthquakedata.Intotal16048Pwavefirstarrivaltimesfrom16048shallowandmid-depthcrustalearthquakes,whichoccurredinandaroundtheBTTareafrom1992to1999wereused.ThefirstarrivaltimesarerecordedbyNorthernChinaUnitedTelemetrySeismicNetworkandYanqing-HuailaiDigitalSeismicNetwork.Hypocentralparametersof1132earthquakeswithmagnitudeML=1.7~6.2andthethree-dimensionalPwavevelocitystructurewereobtainedsimultaneously.TheinversionresultrevealsthecomplicatedlateralheterogeneityofPwavevelocitystructurearoundBTTarea.Thetomographicimagesobtainedarealsofoundtoexplainotherseismologicalobservationswell.

简介：The2008Wenchuanearthquake,amajorintraplateearthquakewithMw7.9,occurredontheslowlydeformingLongmenshanfault.Tobetterunderstandthecausesofthisdevastatingearthquake,weneedknowledgeoftheregionalstressfieldandtheunderlyinggeodynamicprocesses.Here,wedeterminefocalmechanismsolutions(FMSs)ofthe2008Wenchuanearthquakesequence(WES)usingbothP-wavefirst-motionpolaritydataandSH/Pamplituderatio(AR)data.AsP-wavepolaritiesaremorereliableinformation,theyaregivenpriorityoverSH/PAR,thelatterofwhichareusedonlywhentheformerhaslooseconstraintontheFMSs.Wecollectdatafromthreecategories:(1)permanentstationsdeployedbytheChinaEarthquakeAdministration(CEA);(2)theWesternSichuanPassiveSeismicArray(WSPSA)deployedbyInstituteofGeology,CEA;(3)globalstationsfromIncorporatedResearchInstitutionsforSeismology.Finally,129eventswithmagnitudeoverMs4.0inthe2008WESareidentifiedtohavewell-constrainedFMSs.Amongthem,83arewellconstrainedbyP-wavepolaritiesonlyasshownbyCaietal.(EarthqSci24(1):115–125,2011),andtherestofwhicharenewlyconstrainedbyincorporatingSH/PAR.BasedonthespatialdistributionandFMSsoftheWES,wedrawfollowingconclusions:(1)theprinciplecompressionaldirectionsofmostFMSsoftheWESaresubhorizontal,generallyinagreementwiththeconclusiongivenbyCaietal.(2011)butwithafewmodificationsthatthecompressionaldirectionsareWNW–ESEaroundWenchuanandENE–WSWaroundQingchuan,respectively.ThesubhorizontalcompressionaldirectionalongtheLongmenshanfaultfromSWtoNEseemstohavealeftlateralrotation,whichagreeswellwithregionalstressfieldinvertedbyformerresearchers(e.g.,Xuetal.,ActaSeismolSin30(5),1987;ActaGeophysSin32(6),1989;Cuietal.,SeismolGeol27(2):234–242,2005);(2)theFMSsoftheeventsnotonlyreflectedtheregionalstressstateoftheLongmenshanregion,butalsowereobviouslycontrolledbythefaultstosomeextent,whichwaspointedou

简介：TheInternationalGeologicalCongresses(IGCs)hadbeeninterruptedfornineyearsduringWorldWarI,betweenToronto(1913)andBrussels(1922).WorldWarIIcausedanevenlongerbreakofelevenyears,betweenMoscow(1937)andLondon(1948).

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简介：事件波浪的明显的速度是为与理论方法模仿旋转地面运动的一个重要参数，但是当仅仅有单个record.This时，纸在一块多层的各向同性的橡皮基于elastodynamic理论讨论一个P-SV比率方法，有效地对估计困难在SMARTI的四地震的明显的速度穿的半space.The与这method.The结果被计算接近使用旅行时间analysis.Furthermore的一个方法，因素

简介：目前正在处理三维PP全方位、全偏移测量以便确定AVO（AVOA）、速度和其它参数之间的方位变化。量化AVOA的3个维数的图显示——大AVO梯度、大AVO梯度的方位和AVO梯度的方位变化——告诉观测者有关跨越边界的横波双折射反差的情况。通常把横波双折射看作与裂缝密度成正比。需要两类其它信息评价P波AVOA正在告诉我们：（1）反射层上下的方位层速度信息；（2）各向异性AVOA模拟，以便描述可能在给定位置出现的各种地质情况。

简介：CaSiofx-4500p计算器的各种功能较之fx-3600p、fx—180p等有了长足的进步。该机最大步骤数为1103步，具有转移和子程序功能，用以复杂的重复计算。该机不失为现场测量人员选用的较好机型，现简介如下：