许昌麦岭水源地可开采量的水均衡法计算

根据许昌麦岭镇多年地下水动态观测资料,利用水均衡法原理,对水源地边界地质条件、补给与排泄的关系进行研究,对地下水允许开采量进行综合评价,提出水源地水量开采的建议。     

新疆富蕴县柯鲁木特锂-钽-铌矿床228号脉地质特征分析

通过对柯鲁木特锂-钽-铌矿床228号矿脉的普查，发现该矿脉锂、钽、铌的含量较高，矿脉规模大。为了进一步在该区开展找矿工作，阐述了228号含矿伟晶岩脉的共生结构分带的产出特征、结构带内部特征、稀有元素含量变化及其不同矿化类型等，在总结了228号及其相似的113号、116号含矿伟晶岩脉成矿地质背景的基础上，指出伟晶岩的主要形成阶段和矿化阶段是在一个比较封闭的地质环境中生成的，并认为含矿伟晶岩脉的形成与二云母二长花岗岩有着密不可分的关系。     

双剪统一强度准则改进及其在岩土工程中的应用

在分析Mohr-Coulomb强度准则和双剪统一强度准则的基础上,提出了主剪面应力对和主剪面应力对的作用这2个新概念,并以此为出发点,通过考虑十二面体单元主剪面上所有3个主剪面应力对的共同作用,在双剪强度准则的基础上提出了一个新准则,并对其作了极限线分析.应用该新强度准则研究了静水压力条件下圆形巷道围岩弹塑性分析和土压力计算问题.研究表明,该准则不仅能较好地非线性反映岩土的3个基本强度特征,还解决了双剪统一准则中存在的双重破坏角问题.     

高速公路软基加固质量的瑞利波检测与小波分析技术

论述了用瑞利波检测高速公路软基加固的一些主要技术问题,应用新兴的小波分析技术,改善和提高检测的质量,并通过福宁高速公路的实际检测结果,说明了其思路和方法的正确性、实用性.     

四川盆地潜在震源区的细致划分

四川盆地包括川中台拱和川东陷褶束的范围，具有相对稳定的大地构造环境.鉴于该地区地震活动水平相对较低、发震构造不甚明确的特点，在编制1990年版中国地震烈度区划图时，划分的潜在震源区面积也相对较大.本文在总结四川盆地中强地震（Ms=4.7-5.7）发震构造条件的基础上，用地震构造类比原则对四川盆地的潜在震源区进行了重新划分.确定潜在震源区边界时，充分考虑了背斜轴走向、背斜构造的影响带宽度、小震活动密集条带和余震的分布范围.得到了四川盆地更加细致的潜在震源区划分方案.这对于低地震活动水平地区的潜在震源区的细化研究具有一定参考意义。     

民乐、山丹6.1级地震异常及台站实现短临预报的思考

在综合分析了民乐-山丹6.1级地震前张掖中心台范围内震兆异常特征的基础上,总结了本次地震前该台的短临预报过程及存在的问题,对今后台站如何搞好地震短临预报工作进行了探讨.     

Correcting method of eddy covariance fluxes over non-flat surfaces and its application in ChinaFLUX

Although Eddy Covariance (EC) technique is one of the best methods for estimating the energy and mass exchanges between underlying surface and atmosphere in micrometeorology, errors and uncertainties still exist without necessary corrections. In this paper, we will focus on the effect of coordinate system on the eddy fluxes. Based on the data observed over four sites (one farmland site, one grassland site and two forest sites), the effects of three coordinate system transforming methods (Double Rotation-DR, Triple Rotation-TR and Planar Fit-PF)on the turbulent fluxes are analyzed. It shows that (i) the corrected fluxes are more or less than the uncorrected fluxes, which is related mainly to the sloping degree of surface, wind speed and wind direction; and (ii) pitch angle has a sinusoidal dependence on wind direction, especially in the regular sloping terrain; and (iii) PF method is something like the simplification of TR or DR,and there are not obvious distinctions in correction in sloping grassland and flat farmland, but PF method is not suitable for uneven and irregular forest sites.     

Vertical dynamic and thermodynamic characteristics of urban lower boundary layer and its relationship with aerosol concentration over Beijing

By utilizing observational data from a 325 m tower of the Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS) on March 19-29, 2001 and August 11-25, 2003, a comprehensive study was conducted on the vertical dynamical and thermodynamic characteristics of the urban lower boundary layer (ULBL) and its relationship with aerosol concentration over Beijing. Firstly, a comparative analysis was made on the gradient data (wind, temperature and humidity), ultrasonic data (atmospheric turbulences) and air-quality observations at different tower heights (47, 120 and 280 m). Secondly, a diagnosis was made to reveal the major features of normalized variances of velocity and temperature, turbulence kinetic energy as well as their relationship with aerosol concentrations. Furthermore, the characteristics of the ULBL vertical structure and the TSP concentration/distribution variations during a sand/dust weather process were also analyzed. The outcome of the study showed that under unstable stratification, the normalized variances of velocity (σu/u*, σv/u*, σw/u*) and temperature (σT/T*) at 47 and 120 m heights fit the Monin-Obukhov similarity (MOS) framework and the fitting formulas were given out accordingly. According to the stratification parameter (z′/L), the stable ULBL could be divided into 2 zones. With z′/L<0.1, it was a weakly stable zone and MOS framework was applicable. The other was a highly stable zone with z′/L>0.1 and the normalized velocity variances tended to increase along with higher stability, but it remained constant for normalized temperature variances. At daytime, the near-surface layer includes two heights of 47 and 120 m, while 280 m has been above it. The ULBL analysis in conjunction with a sand/dust weather process in Beijing in March 2001 indicated that the maximum concentration of Total Suspended Particulates (TSP) at 320 m reached 913.3 μg/m3 and the particles were transported from the upper to lower ULBL, which was apparently related to the development process of a low-level jet and its concomitant strong sinking motion.     

桩底注浆钻孔灌注桩承载力的研究

通过天津地区几例钻孔灌注桩桩底注浆的静载荷试桩结果 ,分析天津地区钻孔灌注桩桩底注浆单桩竖向极限承载力标准值的估算方法     

大学城的另类定位--广州旅游的"太阳"

从旅游的角度,运用定性分析和比较分析的方法,分析广州大学城,发现它在广州所有景区中,最有资格和条件担当广州旅游的“太阳”。它位于广州市番禺区新造镇小谷围岛,投资规模、大学数量、占地面积和规划人口容量皆为中国之最,是世界最大的人造景区,具有浓浓的文化氛围、时代气息,能够体现与闪烁广州的灵魂与精神。为此,广州应在大学城的建设中为未来角色创造更好的条件。