六盘山两侧晚新生代红黏土高程分布及其新构造意义

晚新生代红黏土广泛发育于青藏高原东北部陇西高原和鄂尔多斯高原,它不仅是我国北方晚新生代气候和环境变化的载体,而且其高程分布特征也记录了高原地区新构造运动过程。运用遥感技术和数字高程模型(DEM)技术,结合野外调查,分析了六盘山两侧红黏土空间分布特征,并结合已有的红黏土年代学资料及其沉积特征,探讨了青藏高原东北缘的构造隆升,指出红黏土在陇西地区开始沉积以来,六盘山两侧存在多期构造差异性隆升。由于陇西地区隆升速率相对较大,最终使六盘山两侧的构造-地貌格局从原先的东高西低转变为西高东低。     

拟线性退化椭圆型方程的边值问题

运用逼近理论来讨论在Ｘ轴上退化的拟线性偏微分方程的混合边值问题,提出并证明了解的存在性。     

STUDY ON RAINFALL MEASUREMENT AND RAINDROP SPECTRA WITH THE DIFFERENTIAL REFLECTIVITY ZDR TECHNIQUE OF A DUAL LINEAR POLARIZATION RADAR*

In this paper,it is shown that the differential reflectivity Z_DR is related to drop size distribution (DSD) and the spectral shape variation of different truncated diameters.Z_DR is a sensitive function to variation of DSD of the spectra.The effects of shape variation of DSD on rainfall can be deduced with a (Z_H,Z_DR) dual-parameter technique,which is effective to improve the accuracy of rainfall measurement and is of the priority of identifying large particles of hydrometeors (especially hailstone) from the rain region.     

矿产资源价值评估的理论与方法研究综述

系统评述了国内外有关矿产资源价值的观点,分别介绍了国外和国内矿产资源价值评估的理论和方法的研究状况,同时,以矿产资源级差收益的理论和评估方法也进行了论述。     

卫星雷达干涉测量原理与应用

本文综述卫星雷达干涉测量和差分干涉测量的基本原理及其应用。文章从比较雷达干涉测量与一般航测遥感的基本差别出发 ,介绍各种干涉模式下的雷达干涉测量原理、差分干涉测量原理和数据处理流程。在简要叙述雷达干涉测量应用领域后 ,重点列出 INSAR在地形测量、火山地形测量和 D- INSAR在地形沉降监测中的应用。最后 ,本文还探讨了存在的问题和应用前景。     

Intercomparison of Formaldehyde Measurements in Clean and Polluted Atmospheres

Three different techniques used tomeasure atmospheric formaldehyde were compared duringa field campaign carried out at a clean maritime siteon the West coast of Ireland. Two spectroscopictechniques Differential Optical AbsorptionSpectroscopy (DOAS) and Tunable Diode Laser AbsorptionSpectroscopy (TDLAS), together with a glass coil/Hantzschreaction/fluorescence technique, wereemployed for measurements of atmospheric formaldehydeof the order of a few hundred pptv. The betteragreement was observed between the fluorescence andDOAS instruments.Two DOAS instruments were compared to the glasscoil/Hantzsch reaction/fluorescence technique at asemi-polluted site on the North Norfolk coast, U.K.,where concentrations of formaldehyde were observed atlevels up to 4 ppbv. A very good agreement wasobserved between the two instruments.The glass coil/Hantzsch reaction/fluorescence and theTDLAS instruments were also deployed simultaneously inorder to measure indoor air inside a mobile laboratorylocated at the Imperial College Silwood Park site nearAscot, U.K. The doors of the mobile laboratory wereleft open in order to obtain the backgroundformaldehyde concentrations. Closing them afterwardsallowed us to observe the increase in concentrationsas a result of indoor emissions. The agreement betweenthe two instruments was outstanding (correlationcoefficient was 99%).The results from this study showed that of the fourinstruments included in this intercomparison the glasscoil/Hantzsch reaction/fluorescence technique provedthe most suitable for continuous measurements offormaldehyde in the background atmosphere.     

山东半岛潟湖湿地发育特征及区域分异演化研究

根据区域环境差异,将山东半岛沿岸划分为6个不同岸段,对不同岸段潟湖湿地的发育程度进行了统计。计算表明,山东半岛不同岸段潟湖湿地的发育程度是不同的,其中平直沙质海岸和开敞、半开敞性岬湾海岸的潟湖湿地比较发育,封闭性较好的岬湾海岸潟湖湿地则发育程度较差。同时,根据潟湖湿地的水文特征,把山东半岛潟湖湿地划分为成水潟湖、半咸水潟湖、淡水潟湖和近代埋藏潟湖四种类型,并对山东半岛不同岸段潟湖湿地的区域分异演化进行了阐述。     

瞬变电磁测深的微分电导成像

通过对等效导电平面方法原理的阐述,指出了利用视纵向电导参数进行瞬变电磁测深资料解释的优越性。同时,为了提高对电性层位的分辨能力,在明确电导及其导数曲线物理含义的基础上,采用B样条函数对实测数据进行处理,实现了电导参数的微分成像。实践证明,采用该方法的成像结果与其他反演结果吻合较好,其“电性同相轴”以直观、形象的面貌清晰地展示了电性界面的分布形态。      

Biot介质密度参数的容差密度表达

探讨了Biot介质密度参数的表达形式。首先给出Biot介质地震波场的基本方程;然后基于动能方程,分别得到了开放边界条件和闭合边界条件的密度,进而用这两个密度的差值定义了“容差密度”,容差密度突出了孔隙介质宏观的平均状态,回避了孔隙形态等细节问题,在此基础上推导出Biot介质密度参数的容差密度表达形式;最后对密度参数的表达式进行了分析讨论,深化了Biot介质密度参数的认识,特别指出耦合密度的负值性是动能的非负性和惯性力的平衡关系所约束的结果。     

非自治微分系统的周期解

本之应用李亚普诺夫变换和数值逼近的方法,研究了几类非自治非线性微分系统周期解的存在性及唯一性,得到了一些新的结果。