简介：Dongpu()消沉是中生代沉淀和在北方中国craton以内开发的新生代差错盆。自从Permo含碳的烃来源岩石的免职，消沉经历了许多构造骚乱并且高举。来源岩石经历了不一致高举，变丑，深埋葬，并且导致的magmatism，和那些一打断或在Qinggu的烃来源岩石的逐步的进化()-2很好。我们调查了埋葬的历史，加热，并且Permo含碳的烃来源的烃产生不仅仅根据构造骚乱并且深埋葬摇，而且与在磷灰石分裂轨道分析的新研究，液体包括大小，并且EASY%Ro的数字模拟的应用程序。来源岩石的加热温度从Indosinian向上搏动了到喜玛拉雅的阶段并且到达了最大值在期间早喜玛拉雅。这导致了器官的成熟的逐步的增加和烃产生的多重阶段。这研究描出构造阶段，成熟在Qinggu-2发展了Permo含碳的来源岩石的烃产生的范围，和紧张很好。烃产生主要发生在Indosinian期间并且早喜玛拉雅。早喜玛拉雅的阶段烃产生是更大的，而是Dongying()运动，它发生在结束早喜玛拉雅，可以破坏套住的油和气体。从而，未来探索将需要在Qinggu-2井区域对Dongying运动效果给予更多的注意，并且它可以在Permo含碳的油和气体得到新突破。

简介：从Obudu高原的东南的代表性的花岗石样品的稀土元素的元素(REE)集中，尼日利亚，随一次尝试被分析决定他们的来源，进化历史和构造背景的签名。结果显示花岗石有高绝对的REE集中(190xl0~(有使球粒状陨石正常化的REE模式的-6)-1191xl0~~(-6);av.=549xl0~(-6))由陡峭的否定斜坡描绘了并且对忽视或没有否定Eu异例突出。所有样品被LREE的高、可变的集中也描绘(151x10~(-6)-1169xl0~(-6);av.=466xl0~(-6)),whileHREE表演low丰富(4xl0~(-6)-107xl0~(-6);av.=28xl0~(-6))。这些与花岗石的REE分别，和区别的可变层次一致。这被REE内容，使球粒状陨石正常化的模式和比率的范围进一步支持La_N/Yb_N(2.30-343.37)，Ce_N/Yb_N(5.94-716.87)，La_N/Sm_N(3.14-11.68)和Tb_N/Yb_N(0.58-1.65)。REE模式的一般并行，建议所有花岗石是在起源的comagmatic，当时高Eu/Eu*比率(0.085-2.807；av.=0.9398)在来源显示高f_(O2)。同样，在La_N/Yb_N，Ce_N/Yb_N和Eu/Eu的不规则的变化*在样品之中的比率和REE丰富建议与披风和外壳的来源有关的行为。

简介：Inthispaper,asingularlyperturbedRobintypeboundaryvalueproblemforsecond-orderordinarydifferentialequationwithdiscontinuousconvectioncoefficientandsourcetermisconsidered.Arobust-layer-resolvingnumericalmethodisproposed.Anε-uniformglobalerrorestimateforthenumericalsolutionandalsotothenumericalderivativeareestablished.Numericalresultsarepresented,whichareinagreementwiththetheoreticalpredictions.

简介：Inthispaperthepropertiesofspace-timecorrelationfunctionofthenoisefieldofmovingsourceinlayeredstatisticinhomogeneousmediumarestudiedandtheeffectsofrandomfluctuatingboundaryarecon-sideredaswell.Ithasbeenshown,theoreticallyandexperimentally,multi-pathpropergatingeffectscausethedispersionofthecorrelationfunctionandfluctuationsofthemediumrefractionindexandtheboundarycausethefluctuationofit.Theeffectofthemovementofthenoisesourceontheoutputofreal-timecorrelatorisequivalenttoalow-passfilteraddedthedriftofspace-timecorrelationfunction.Thesepropertiesofthecorrelationfunctioncausegravedegradationofthesignalprocessinggainofnoiserangingsonarsystem.Thefluctuatingandthedistortionofconrrelationfunctionmadeitdifficulttorealizethenoiseranging.Sointhispaper,amethodofspacecorrelationrangingbyalineararrayoffourpointswithshortseparationandlongspanandatechnigueofdual-correlationsignalp

简介：Wepresentanultrabroadband,high-speedwavelength-sweptsourcebasedonaself-modulatedfemtosecondoscillator.Photoniccrystalfiberwaspumpedbyamode-lockedYb:CaF2laser,resultinginastrongspectralbroadeningfrom485to1800nm.Thepumplasercavitycouldberealignedinordertoachievetotalmode-lockingofthelongitudinalandtransverseTEM00andTEM01electromagneticmodes.Thisledtospatialoscillationsoftheoutputbeam,whichinducedmodulationofthecouplingefficiencytothefiber.Duetothefactthatnonlinearspectralbroadeningwasintensitydependent,thismechanismintroducedwavelengthsweepingatthefiberoutput.Thesweepingratecouldbeadjustedbetween7and21.5MHzbychangingthegeometryofthepumpcavity.Bycontrollingtheratioofthetransversemodeamplitudes,wewereabletotunethesweepingbandwidth,eventuallycoveringboththe1300nmand1700nmbioimagingtransparencywindows.Whencomparedwithpreviouslydemonstratedwavelength-sweptsources,ourconceptoffersmuchbroadertunabilityandhigherspeed.Moreover,itdoesnotrequireanadditionalintensitymodulator.

简介：Wedemonstrateawidelytunablenear-infraredsourcefrom767nmto874nmgeneratedbytheintracavitysecondharmonicgeneration(SHG)inanopticalparametricoscillatorpumpedbyaYb:LYSOsolid-statelaser.Thehome-madeYb:LYSOoscillatorcenteredat1035nmdeliversanaveragepowerof2Wandapulsedurationasshortas351fs.TwoMgOdopedperiodicallypoledlithiumniobates(MgO:PPLN)withgratingperiodsof28.5–31.5μminstepsof0.5μmand19.5–21.3μminstepsof0.2μmareusedfortheOPOandintracavitySHG,respectively.Themaximumaverageoutputpowerof180mWat798nmwasobtainedandtheoutputpulseshavepulsedurationof313fsat792nmifasech2-pulseshapewasassumed.Inaddition,tunablesignalfemtosecondpulsesfrom1428nmto1763nmarealsorealizedwiththemaximumaveragepowerof355mWat1628nm.

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简介：Dielectric-barrierdischarges(DBDs)inatmosphericpressureairhavebeenstudiedbyusingapower-frequencyvoltagesource.InthispapertheelectricalcharacteristicsofDBDsus-ingglassandaluminadielectricshavebeeninvestigatedexperimentally.AccordingtotheLissajousfiguresofvoltage-charges,itisdiscoveredthatthedischargepowerforanaluminadielectricismuchhigherthanthatforaglassdielectricatthesameappliedvoltage.Also,thevoltage-currentcurvesoftheglassandaluminadielectricsconfirmthefactthatthedielectricbarriersbehavelikesemiconductingmaterialsatcertainappliedvoltages.

简介：从它的来源地面跟踪沉积交货到它的最终的水池想象在理解现代erosional起一个重要作用的多重因素引擎。完成这，区分贡献盆的可变结束成员是重要的。从dryland的学习的调查结果在Kachchh(西方的印度)的沿海的河的政体，它是贡献Kachchh海岸(部分水池)并且最后的海湾到阿拉伯的海(最终的水池)的结束成员之一这里被介绍了。象谷物尺寸，泥土矿物质，地球化学和磁性的矿物质那样的多代理沉积起源代理被采用了评估区别Kachchhdryland的特征的起源影响他们的河的系统和因素。不同代理的结果显示高地的起源签名与磁性的危险性是相当特征的()价值<在0.26和0.49之间的20107m3kg1和绿土(S)/kaolinite(K)比率。当河口道显示出价值(80107m3kg1)时，活动范围显示出的中间与价值(140107m3kg1)和S/K比率(4.92)在磁性的矿物质集中标记增加，S/K比率(1.90)并且，典型重矿物质(即云母矿物质)，可能反映在土地和海摆动之间的相互影响。在集水规模以内的沉积的主要来源被识别，viz，高地沉积岩石(Juran和Bhuj形成沙岩页岩)和中间的活动范围暴烈(Deccan陷井形成暗岩)岩石。现在的学习在有压到优势的沉积交货的Deccan暗岩影响的区域在沉积辨别的起源拉小心并且一另外的起源签名的比较地抑制的效果。重、主要的元素的泥土，磁性的矿物质和地球化学的矿物学的学习代理为沉积来源区域的指纹用作潜力并且因此在来源看到一个强壮的位置全球性压制研究。

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简介：Thesourceofore-formingmaterialshaslongbeenacontroversialfocusbothinmetallogenictheoryandinore-searchingpractice.Thisstudydealswiththeheliumandargonisotopiccharacteristicsofpyritesfrom11golddepositsandsomecountryrocksinthegoldmineralizationconcentratedareaswithinthethreemantle-branchstructuresintheregionofNorthHebeiProvince.Itisindicatedthat3He/4Heratiosinthegolddepositsarewithintherangeof0.93×10-6-7.3×10-6,withanaverageof3.55×10-6;R/Ra=0.66-4.93,averaging2.53;40Ar/39Arratiosvarybetween426and2073,withtheaveragevalueof40Arbeing8.32;andtheaverageof4He/40Arratiosis2.17.3He/4Heratiosingneissandgraniteintheperipheryoftheminingdistrictarewithintherangeof0.001×10-6_0.55×10-6,reflectingsignificantdifferencesintheirsources.3Heand4Hefallnearthemantle,asisshownintheHeconcentrationdiagram.Studieshaveshownthattheore-formingmaterialsinthisregionshouldcomefromthedeepinterioroftheEarth.Withthemulti-stageevolutionofmantleplume,ore-formingfluidsinthedeepinteriorweremovingupwardstoshallowlevels(crust).Undersuchcircumstances,therewouldbeinevitablyoccurcrust/mantlefluidmixing,sotheirnoblegasisotopiccharacteristicsareintermediatebetweenthemantleandthecrust.

简介：Inhighlypopulatedurbancenters,traditionalseismicsurveysourcescannolongerbeproperlyappliedduetorestrictionsinmoderncivilianlifestyles.Theambientvibrationnoise,includingbothmicroseismsandmicrotremor,thougharegenerallyweakbutavailableanywhereandanytime,canbeanidealsupplementarysourceforconductingseismicsurveysforengineeringseismologyandearthquakeengineering.Thisisfundamentallysupportedbyadvanceddigitalsignalprocessingtechniquesforeffectivelyextractingtheusefulinformationoutfromthenoise.Thus,itcanbeessentiallyregardedasapassiveseismicmethod.Inthispaperwefirstmakeabriefsurveyoftheambientvibrationnoise,followedbyaquicksummaryofdigitalsignalprocessingforpassiveseismicsurveys.ThentheapplicationsofambientnoiseinengineeringseismologyandearthquakeengineeringforurbansettingsareillustratedwithexamplesfromBeijingmetropolitanarea.Forengineeringseismologytheexampleistheassessmentofsiteeffectinalargeareaviamicrotremorobservations.Forearthquakeengineeringtheexampleisforstructuralcharacterizationofatypicalreinforcedconcretehigh-risebuildingusingbackgroundvibrationnoise.Byshowingtheseexampleswearguethattheambientnoisecanbetreatedasanewsourcethatiseconomical,practical,andparticularlyvaluabletoengineeringseismologyandearthquakeengineeringprojectsforseismichazardmitigationinurbanareas.

简介：摘要：我国写作教学普遍存在缺乏独立编写的写作教材，缺乏具体的写作过程指导，缺乏明确的写作评判标准等问题。这样的写作教学导致学生在写作过程中没有具体的写作步骤可遵循，语言文字缺乏逻辑，写作内容难免脱离实际，没有真情实感。本文通过分析美国写作教材《Write Source》教材特点得出美国作文教学对我国作文教学的启示，即在作文教学过程中，应当注重从哪些方面培养学生的写作能力，提高学生的写作水平。

简介：Ithaslongbeenacontroversyaboutthesourceofore-formingmaterialsofAu-Agpolymetallicdepositsbothinmetallogenictheoryandinore-searchingpractice.IntermsofalargewealthoftheisotopicstatisticsdatafromIndosinian-YanshanianendogenicoredepositsinnorthernHebei(generallyreferringtotheareasalongthenorthernpartofTaihangMountainsandnorthernHebei,thesamebelow),itisconsideredthattheore-formingmaterialscamefromthedeepinterioroftheEarth,whichhadmigratedthroughplumestotheEarthsurfacewhileex-periencedmulti-stageevolutionandthenemplacedprogressivelyinfavorablestructurallocitoformores.Theirisotopedatashowthat559sulfurisotopicdatafrom40oredepositsare,forthemostpart,withintherangeof-5‰-5‰,withahighdegreeofhomogenization,indicatingthatthesulfurisderivedmainlyfrommagma;200leadisotopedatafrom37oredepositsindi-catethattheore-formingmaterialsareprincipallyofmantlesourcethoughsomecrust-sourcema-terialwasinvolved;96oxygen,hydrogenandcarbonisotopedatafrom34oredepositsillustratethattheore-formingfluidsaredominatedbymagmaticwaterwhileothersourcesofwaterwouldbeinvolved.Itmaythereforebeseenthattheformationofendogenicdepositshasnothingtodowiththestrata.

简介：NumerousdarkenclaveswithdifferentshapesarefoundinJiulingNeoproterozoicgranitoids.PreciseLAICP-MSU-Pbdatingwasconductedonzirconsextractedfromtwomicrocrystallineenclavesamples,yieldingcrystallizationagesof822.6±5.8Maand822.2±6.2Ma,respectively.Theconsistentageswithinanalyticalerrorswiththehostgranitoidssuggestedthattheyweretheproductsofthesamemagmatism.Themicrocrystalline-dioriticenclavescommonlyshowplasticformsandcontainsimilarplagioclasemegacryststothehostrocks,andbothoftheenclavesandhostgranitoidsshowedacomplexcompositionandstructuralimbalanceinplagioclases.Furthermore,theapatiteswithaeuhedralacicularshapeoccurredwidelyinthemicrocrystalline-dioriticenclaves.Allofthesepetrographicfeaturesaboveimplymagmamixingisinvolvedintheirdiagenesis.TheenclavesandhostgranitoidsshowamarkedzircontraceelementdifferenceandHfisotopicsignatureswithoutcorrelationinzircontraceelementpairsbutformtheirownsystembetweenenclavesandhostgranitoids.Additionally,mostofthezirconsshowextremelyhighεHf(t)withεHf(t)=3.54?11.94fromthesouthernsamples,andεHf(t)=1.0?9.09fromthecentralregion.SomezirconswiththehigherεHf(t)aresimilartothezirconsfromthejuvenileislandarcintheeasternsegmentofJiangnanOrogen.IntegratedgeologicalandHfisotopiccharacteristicssuggestmicrocrystalline-dioriticenclaveswerederivedfromthepartialmeltingprocessoftheMesoproterozoiccrustwhichenrichedjuvenileislandarcmaterialsandmixedwiththegraniticmagmathatremeltedfromtheMesoproterozoiccontinentalcrustwhichrelativelyenrichedancientsedimentsandmixedwiththehostgranitoidindiagenesis.

简介：AnoilflowobtainedfromtheMiddleOrdovicianFengfengFormationcarbonatereservoirinthewellKG-3,Kongxiburial-hillzonein1993markedabreakthroughinpetroleumexplorationofthehigh-matureLowerPalaeozoicstrata,NorthChina.BoththeLowermemberoftheFengfengFormationandtheSecondMemberoftheUpperMajiagouFormationintheMiddleOrdovicianaresupposedtobethemainsourcebeds.Oilgenerationpeaksrangefrom1.0%to1.6%inRo,showinga搇ageffect?ofoilgenerationinhigh-maturecarbonatesourcerocksundermulticyclictectonicmovementconditions.TheKongxiburial-hillzoneadjoinsapotentialOrdoviciansourcekitchen.TheKG-3Ordovicianburial-hillreservoirhasundergonetwooilfillingevents,i.e.,anearlyeventintheLateCarboniferous-PermianandamoresignificantlateeventintheearlyEogene.

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简介：Accordingtostudiesofmorethan20earthquakeswithMS≥5.0inNorthChina,sevenfeaturesoftheshort-termandimminentearthquakeprecursorshavebeensummarizedinthispaper.Atthesametime,takingtheshort-termandimminentearthquakestageasthephysicalprocessofasource’smediumsofteningandfaultcreep,wecalculatedtemporalvariationofmeanstress,maximumshearstress,bodystrain,andporepressureinsomecertainpoints(supposedstations)inthesourceareaanditsadjacentareabyusingananisotropicandnonlinearsourcemodelandafiniteelementmethod.Accordingtoananalysisofthesetheoreticalcurves,weconcludethattheshort-termandimminentearthquakeprecursorshavesuchcharacteristicsascomplexshapes,exponentialgrowthoftheprecursornumberwithtune,andprecursors’migrationfromtheoutsideareatothesourcearea,whichtoacertainextentrevealthecauseofthecharacteristicsoftheshort-termandimminentearthquakeprecursorfield.

简介：Analyticalsolutionsfortheflexural-gravitywaveresistancesduetoalinesourcesteadilymovingonthesurfaceofaninfinitelydeepfluidareinvestigatedwithintheframeworkofthelinearpotentialtheory.Thehomogenousfluid,coveredbyathinelasticplate,isassumedtobeincompressibleandinviscid,andthemotiontobeirrotational.ThesolutioninintegralformforthewaveresistanceisobtainedbymeansoftheFouriertransformandtheexplicitlyanalyticalsolutionsarederivedwiththeaidoftheresiduetheorem.Thedispersionrelationshowsthatthereisaminimalphasespeedcmin,athresholdfortheexistenceofthewaveresistance.NowaveisgeneratedwhenthemovingspeedofthesourceVislessthancminwhilethewaveresistancesfirstlyincreasetotheirpeakvaluesandthendecreasewhenVcmin.Theeffectsoftheflexuralrigidityandtheinertiaoftheplatearestudied.