异常的地幔氢同位素组成和极端的微尺度不均一性: 女山角闪石的离子探针分析

运用离子微探针技术对采用自安徽女山新生代玄武岩的３块橄榄岩包体中的４个角闪石颗粒进行了详细的氢同位素分析,δＤＳＭＯＷ值表现出较大的变化范围和罕见的正值：－９４‰－＋４６‰,４件样品都表现出明显的微尺度不均一性,同一颗粒内部不到４００μｍ的尺度上δＤ值变化可达８０‰,氢同位素比值和氢含量之间没有相关性,说明氢同位素的变化不是由于后期过程引起的,而是继承自地幔源区,女山角闪石的化学成分均一,这表明氢     

Existence of Equilibrium of Multiperiod Plan-Market Economy with the Stock Market

1　IntroductionWilliamA.ByrdhasstudiedtheexistenceofequilibriuminasimplemodelwithdistinctiveChineseeconomy(seeByrd,1989).Industrialgoodsaresubjecttomultipleallocationmechanism,includingvariousadministrativechannels,termedplanningsystemandcom-modityma...     

METHODS OF ESTIMATION FOR QUASI-INDEPENDENCE IN CONTINGENCY TABLES

1.IntroductionAnUInberofauthorshaveconsideredtheproblemoffittingmodelsofquasi-independencetocontingenCytabledatawhichareeithertriangUlarorhaveanexcludeddiagonal.hithispaperthevariousmethodsproposedforfittingthesemodelsarecompared.ItisthenshoWnthstparameterestimatesarethesamefordifferentmodelsinsomecases.Anew,verysample,easytoimplemeDtalgoritlunispreseDted.Finallysomepreviousiterstivemethodsarecomparedwiththenewmethod.2.Quasi-IndependenceModeisforContingencyamblesSupposethatatwo-waycolltin…     

An Adaptive Identification and Control Scheme Using Radial Basis Function Networks

1.INTaODUCTIONThemultilayerfeedforwardneuralnetworks(MFNN)hasbeenwidelyappliedinmanyfieldssuchaspatternrecognition,nonlinearoptimization,systemidentificationandcontrol.Thesimpleback-propagation(BP)learningalgorithmisusuallyadoptedtoupdateitsweights.TheBPalgorithm,however,suffersdrawbacksofslowconvergenceandunpredictablesolutionsduringlearning.Althoughmailyapproachessuchasvariablestepsize,conjugategradient,pseudo-Newtonmethods[4]andothermethods[3,10],havebeendevelopedtoovercometheproble…     

地球内核的地震波速各向异性与其自转有关

地球内核相对于外部地球存在差异的转动,固体内核表面相对于液态外核运动的线速度在赤道上最大,在两极为零,因此内核生长速度在赤道附近比两极处快,引力作用将驱动某内部的物质内赤道向两极流动使其保持近似球形,与这一流动相应的轴对称应力场使得六方紧密堆积（ｈｃＰ）铁晶体的ｃ轴沿内核自转轴方向排列,导致地震波速度各向异性。     

喜马拉雅山中段达索普粒雪芯中夏季风和尘埃信号记录研究

通过粒雪芯δ＾１８Ｏ和主要离子（Ｃａ＾２＋,Ｍｇ＾２＋,ＮＨ＾＋４,ＳＯ＾２－４和ＮＯ＾－３）的分析表明,该粒雪芯年平均积累量为０．７５ｍ水当量。粒雪芯中δ＾１８Ｏ和主要离子浓度的季节变化表明,达索普冰川中高精度的记录了现代夏季风和尘埃信号。夏季风期间降水中δ＾１８Ｏ值由“降水量效应”所控制,雪层中较低δ＾１８Ｏ值则代表了夏季风信号。亚洲中部干旱半干旱区的春季尘暴输入是造成粒雪芯中Ｃａ＾２＋,Ｍｇ     

FMRP与TDG蛋白的相互作用

脆性Ｘ智力低下蛋白ＦＭＲＰ表达的缺乏可以导致最常见的遗传性智力低下疾病—脆性Ｘ综合征。用酵母双杂交体系筛选与ＦＭＲＰ相互作用的蛋白质,以期通过相互作用的蛋白质研究与ＦＭＲＰ相关的生化途径。从小鼠胚胎ｃＤＮＡ文库中得到一个与ＦＭＲＰ特异相互作用蛋白的ｃＤＮＡ（Ｇｅｎｂａｎｋ号ａｆ１０２８５７）。该ｃＤＮＡ编码的蛋白与人的Ｇ／Ｔ错配ＤＮＡ胸腺嘧啶糖苷酶（ｈＴＤＧ）高度同源通过多种ＦＭＲＰ造反剪接异构体     

植物标签技术

传统的正向遗传学主要用于克隆表型或功能已确定的基因。转座子标签突变体可用随机标签法从带有活性转座子的自交后代中筛选得到,或用定向标签法从杂交一代中筛选得到,即用目的基因的隐性突变统合体与具高度活性转座号的统合体杂交,极大多数的FI个体为正常表型,但其中会有极少量的表现隐性性状的转庄子插入突变体。正向基因标签和克隆法在利用异源和低拷贝数品系时尤其有用。采用反向fCR或热不对称交替PCR（TAIL－PCR）且很容易从单拷贝或低拷贝数品系中获得插入于两侧的基因组序列。TAIL－PCR由三轮连续的半巢式PCR组成,所…     

BEM Analysis of Wave Propagation in a Water-Filled Borehole in an Anisotropic Solid

This paper describes a time-domain boundary element method developed to analyze the interactions of acoustic and elastic waves near the interfaces between water and an anisotropic elastic solid. Two models are analyzed with one being the interface between two half spaces of fluid and solid and the other being a fluid region sandwiched by half space domains of anisotropic elastic solids. Both monopole and dipole point sources are used to generate an initial pressure wave in the fluid. Some snapshots of the transient wave behavior near the fluid-solid interfaces are given. The effect of the anisotropy in the solid on the pressure waveforms in the fluid is discussed. The numerical results allow detailed arrival identification and interpretation of acoustic and elastic waves propagating along the fluid-solid interfaces.     

关于Quarter可层化空间

对第二纲的仿紧Quarter可层化空间进行了研究,证明了这类空间含有σ闭离散的稠密子集. 同时给出了实数集的子集是消去拓扑半群,但是不是Quarter可层化空间.