蛇纹石族矿物及其热转变产物的红外光谱研究     

彭文世  刘高魁 《矿物学报》1986,(2)

本文报道了蛇纹石族矿物及其热转变产物的红外光谱。在室温下斜纤蛇纹石,正纤蛇纹石,叶蛇纹石和利蛇纹石都具有各自的特征光谱。在结构资料基础上,我们解释了它们之间的光谱差异。无疑,红外光谱是区分各种蛇纹石矿物的有效手段。 样品加热到600—700℃时,3680cm~(-1)羟基带消失,这表明在该温度下蛇纹石矿物完全脱羟。与此同时,光谱中出现橄榄石870cm~(-1)的最强带和一个宽带1000cm~(-1),这说明蛇纹石已部分地转变为晶质橄榄石和形成一个无定形的中间相。800℃时,1060cm~(-1)新带的出现标志着顽火辉石的生成。在所有加热样品的光谱中都没有发现SiO_2吸收带,故可认为,在蛇纹石的热转变过程中没有出现SiO_2相。  相似文献   

合成斜方辉石系列的红外光谱研究     

彭文世  谢鸿森  张月明  薛承林  徐惠刚 《矿物学报》1986,(4)

在30kbar和900℃条件下,用等化学计量氧化物混合物合成了11个斜方辉石系列的样品,并对合成的样品进行了X射线粉晶分析和红外光谱分析。分析结果表明,晶胞参数和红外光谱随化学成分的改变而产生复杂的变化。不仅晶胞参数b和M而且频率ν_(670cm)-1和M之间存在很好的线性相关关系,通过用最小二乘法所拟合的相关方程可容易地测定斜方辉石的成分,但是α和c与M之间只有较差的线性关系,而ν_(450cm)-1和M以及ν_(380cm)-1和M之间并无简单的线性相关关系,这可归因于Fe~(2+)在M_1和M_2位置的有序分布。  相似文献   

An application of the threshold autoregression procedure to climate analysis and forecasting     

Shi Jiuen  Zhou Qinfang  Xiang Jingtian 《大气科学进展》1986,3(1):134-138

In this paper a nonlinear method of time series analysis-threshold autoregressive (TAR) model in discrete time is used. The TAR procedure consists of four parts: model building, statistical identification, parameter estimation and forecasting.The object of this study is to estimate monthly total precipitation of Shanghai and Beijing by using open loop TAR model. We can see that the trend of forecasting is in agreement with observations.  相似文献   

在地面三角网中布设卫星观测站的最低精度要求     

周忠谟 《武汉大学学报(信息科学版)》1986,(3)

本文从地面三角网和卫星同联合平差的原理出发,讨论了对卫星网的最低精度要求。指出,为改善地面三角网而布设卫星网时,卫星观测站的最低精度主要决定于以下因素: ——地面三角网的精度; ——对地面三角网精度改善程度的要求; 一卫星观测站之间的距离。这里通过模拟计算对卫星网的最低精度要求与上列因素之间的关系作了数字分析,并建立了估算卫星网最低精度的数学模型。预期,在一般情况下,该模型的估算误差将不会超过10％。  相似文献   

Limits on the ventilation rate for the deep ocean over the last 12000 years     

M Andree  H Oeschger  W Broecker  N Beavan  M Klas  A Mix  G Bonani  H J Hofmann  M Suter  W Woelfli  T-H Peng 《Climate Dynamics》1986,1(1):53-62

In this paper we present accelerator radiocarbon measurements on hand picked benthic and planktonic foraminifera separated from two deep sea cores raised from the South China Sea. From the benthic-planktonic age differences we are able to place limits on the extent to which the ventilation rate of the deep Pacific Ocean has changed over the last 12000 years. While much work remains to be done before any definitive answers for the global oceans can be given, these results on cores with sedimentation rates suitably high to avoid major corrections for bioturbation effects suggest that the ventilation rate of the deep Pacific Ocean has remained nearly the same throughout Holocene time. Further, there is no suggestion that the rate was slower during the period of major glacial retreat. These results confirm that the changes in atmospheric¹⁴C/C ratio over the last 10000 years owe their origin to radiocarbon production rate changes.  相似文献   

THE EFFECT OF ASPECT RATIO ON THE BIFURCATION PROPERTIES OF A DOUBLE PARALLEL-CONNECTION LORENZ SYSTEM     

Zou Chengzhi  Yang Peicai  Zhou Xiuji 《大气科学进展》1986,3(4):406-423

A double parallel-connection (DPC) Lorenz system is developed by performing spectrum truncation of the Galerkin series expansion of the two-dimensional Rayleigh-Benard convection equation. Analyses of the equilibrium states indicate that a convective roll stems from a flow with a given wavenumber first losing its stability for a particular aspect ratio β after a stable laminar flow gets unstable; when β has the value βc able to deprive synchronously two flows with different wavenumbers of stability, occurrences of convective rolls with different wavenumbers depend entirely on the initial conditions, in good agreement with the relevant experimental results. The calculations of the unstablized rolls show that, with a smaller β (as compared with βc), the DPC Lorenz system has the same bifurcation properties as the ordinary Lorenz system; for a moderate β, the system has very complicated periodic, quasi-periodic and phase-locking motions; for a larger β, it results in intermittent chaos and causes mean flows with different numbers of vortices to occur alternately with time. All these indicate that β has substantial effect on the two Lorenz systems coupled through parallel connection in their interaction and the results.  相似文献   

Research Status and Progress of Balloon-borne Cloud and Precipitation Particles Probe     

Peng Wang  Lei Liu  Xichuan Liu  Shuai Hu  Shijun Zhao  Wenming Ji  Taichang Gao 《地球科学进展》1986,35(7):704-714

The accurate observation of the microphysical structure of cloud and precipitation plays an important role in understanding the formation of clouds and precipitation. In-situ measurement using measuring instruments carried by meteorological balloons is an effective way to obtain the microphysical properties of cloud and precipitation particles, which is a supplementary means for aircraft to observe cloud and precipitation particles. This observation method plays a more and more important role in in-situ measurement. According to the difference of the working principle of the existing balloon-borne cloud and precipitation particles probes, the detectors can be divided into particle impact-sampling sensors, particle imaging sensors, light-scattering sensors, light intensity attenuation sensors and charge measurement sensors. The working principles, key technologies and main advantages and disadvantages of typical instruments were summarized, and their applications to detailed cloud structure acquisition, cloud remote sensing method establishment, cloud and precipitation physical process research and parameterization, and scientific observation of thunderstorm clouds were briefly introduced. Finally, the development trend of balloon-borne cloud precipitation particle detectors was prospected, which will provide reference for related technical research and equipment development.  相似文献   

浅谈芙蓉山火山洼地及其与成矿作用关系     

周家志 《华东地质学院学报》1986,(1)

本文阐述了该火山洼地形成的历史背景、大地构造环境、形成时地壳运动的特点及与成矿作用的关系。提出了铀及多金属的矿化特点:铅、锌成矿最早,产于边缘环状构造带外侧;铀矿化以交代充填方式产于洼地内及其边缘环状构造带上;萤石成矿最晚,以充填方式迭加于洼地边缘环状构造带上。  相似文献   

灰色系统关联度的新模型及其在预测矿体埋深中的应用   总被引：2，自引：1，他引：2       下载免费PDF全文

彭放  徐中祥 《地球科学》1995,20(1):63-67

首先提出了灰色系统关联度的一个新模型，分析了该模型的性质，其次讨论了应用该模型和关联滤波法预测矿体埋深的问题，然后进行了理论模型试算，证实了本方法的理论效果，最后，指出了新模型的主要优点。  相似文献   

盆地烃类运移二维二相流动数学模型分析与应用实例   总被引：5，自引：1，他引：5       下载免费PDF全文

陶一川  姜鹏 《地球科学》1995,20(3):314-321

从地质固体系统与流体系统相互作用所形成的能量流、物质流的观点，系统地论述了建立烃类运移主要控制方程，即烃水两相拉格朗日型异常地层压力方程和饱和度方程，研制了开发了烃类运移数值模拟系统，阐明了该耦合系统的要素功能和求解方法，提供了改善系统模拟精度的措施，最后介绍了该模拟系统在松辽盆地东南隆起某测线的应用实例。  相似文献