Fission Track Dating of Authigenic Quartz in Red Weathering Crusts of Carbonate Rocks in Guizhou Province

The Cenozoic evolution history of Guizhou Province, which is located on the southeastern flank of the Qinghai-Tibet Plateau, is unclear because of the lack of sedimentation records. The red weathering crusts widespread on the Yunnan-Guizhou Plateau may bear critical information about their evolution history. This work firstly determined the ages of four red weathering crusts in eastern, central and northern Guizhou. The material used in fission track dating is well-crystallized quartz occurring in many in-situ weathering crusts of carbonate rocks. The results showed that the fission track ages of quartz vary over a wide range from 1 to 25 Ma in the four profiles, significantly younger than the ages of the Triassic and Cambrian parent rocks. In combination with the evolution history of the regional geology during the period from 25 to 1 Ma, the ages of quartz can exclude the possibility that the origin of quartz has nothing to do with primary clastic minerals in parent rocks, authigenesis during diagenesi     

空间Gauss—Kruger投影研究

研究了适合于星下点轨迹是某一经线的卫星图像数据投影选择的空间Gauss—Kruger投影，推导了空间Gauss—Kruger投影公式及其变形情况，并证明了该投影是等角空间投影，最后给出了算例。     

徐州体育中心田径场的验收测量

随着体育事业的发展，各大中城市体育场地的建设也在不断兴起，就其等级、质量如何评定验收，是我们面临的又一新课题，本文以徐州市体育中心为例，介绍了田径场主要环节的验收测量标准，并对该田径场的各主要指标进行了验收测量和详细介绍，供同行们在以后的工作中参考和进一步的探讨。     

基于空间激光牛顿环的导轨检测系统

介绍了一种新型的激光准直系统用于电梯的导轨检测——基于空间激光牛顿环的电梯导轨检测系统。本系统利用激光空间相干技术及其CCD中心探测技术，实现电梯导轨检测工作达到高精度、自动化。本系统还可用于直线导轨产品的直线度检测以及大坝的变形监测。     

台风森拉克路径与预报难点分析

研究了 2 0 0 2年 1 6号台风路径的分析与预报过程 ,分析了 0 2 1 6号台风在几次关键点的预报过程中出现疑难 ,预报争议很大的原因。认为类似 0 2 1 6号台风 ,在其生命史中遇到环境场气压系统比较弱时 ,要注意可能出现路径停滞、打转、转折等。这时 ,应仔细分析 ,避免对预报思路的误导 ,减少预报服务思路的大幅度摆动 ,以提高服务质量与效果。注意台风周围的涡旋发生互旋的半径变化、影响的程度 ,在分析弱涡旋时 ,注意水汽通道云图等其他参考工具是有意义的。     

COMPARISONS OF EOF AND CCA METHODS IN EXPERIMENTS WITH TYPHOON TRACK

A predictive model for 24-120 h track of the tropical cyclone over the South ChinaSea is set upusing the predictors of CLIPER and with reference to those of EOF and CCA. This EOF-and CCA-basedmodel is compared with dependent and independent samples in veritring forecasts'Analpees appltwg themethods to 500-hPa geopotential heights have shown that the CCA method is able toconcentrate moreoriginal information of variable fleld that has the best global correlation withtropical cyclone track andthus reduces more efficiently error arisen in forecast,despite that can0nicaldistribution of weighted vari-able coefficients derived by it is less well-defined or smoothed of a spacialpattern as is done by eigenvec-tor in the EOF method. The verification indicates a certain degree of skill in both track predictive model,though better results are yielded in the CCA-based one, whose mean vector errorare 159.27, 314.84,524.12, 813.03, and 987.12 km, respectively for periods of 24, 48, 72, 96, and 120 h. The modelmakes an objective approach for prediction of short-and medium-range track of tropical cyclone in theSouth China Sea.     

AN IMPROVEMENT OF STATISTICAL PREDICTION OF TYPHOON TRACKS

In this paper, a statistical interpretation composite forecast model for typhoon track is set up by using numerical forecast products and several forecast schemes. Tested in 1994 typhoon season, its forecastperformance is much better than that of a previous statistical forecast model. The test shows that it is aneffective method that sufficiently Anproves objective forecast of typhoon track using the numerical forecast output products obtained in forecast and adopting several schemes in composition.     

EOF和CCA方法在台风路径预报试验中的比较

利用气候持续性因子，并分别考虑了５００ｈＰａ高度场的ＥＯＦ因子和ＣＣＡ因子，分别建立了基于ＥＯＦ因子和基于ＣＣＡ因子的南海台风２４－１２０小时路径预报模式。经过非独立样本和独立样本的预报检验，比较。将两种方法运用于５００ｈＰａ高度场的分析表明，ＣＣＡ方法得出的典型变量权重系数分布虽不能象ＥＯＦ方法的特征向量一样表示出明显的而且平滑的空间场形式，但ＣＣＡ方法浓缩了更多的与台风路径整体相关性最好的原变     

台风路径统计预报的改进

应用数值预报产品并采用多种预报方案相结合建立了台风路径的统计释用综合预报模式，从而提高了台风路径预报的技巧。经１９９４年台风季节业务试用，其预报性能比原有的统计预报模式有较大的提高，试验表明，充分利用在预报时可得到的数值预报输出产品的采用多种方案集成是改进台风路径客观的有效途径。     

α径迹观测中有关问题的实验研究

实验研究表明，不同厚度的醋酸纤维探测经铀α面源照射蝗，其径迹密度与照射时间有很好的相关性；探测片的本底值不会影响其观测结果；径迹的镜下特征与不同照射角度下的特征径迹变化，是照射角度愈接近直角，圆形特征径迹越多，其它形状的径迹越少；在同一观测孔中探测片采用垂直与平行和悬吊三种方式照射，探测到的氡浓度含量相同，观测工线基本吻合；探测片在不同的环境条件下蚀刻其径迹大小不同，目前我省统一使用的醋酸纤维探测