四川北川开茂水库岩溶发育规律及特征探讨

研究区岩溶形态有地表岩溶及地下岩溶,即为岩溶洼地、落水洞及地下岩溶体系.影响岩溶发育的因素有地层岩性、构造、地貌以及水交替条件;岩溶发育具有成层性;库尾的F1、F2断层破碎带附近、坝首及右库岸的三级阶地出露带岩溶较发育.     

南黄海低信噪比地震资料处理技术探索

随着南黄海海相碳酸盐岩油气地震调查的展开,提高海相碳酸盐岩目标层低信噪比地震资料的成像品质,已成为地震处理工作的主要任务。在充分分析了地震地质条件和原始资料特征的基础上,总结了成像处理存在的主要问题,探索了针对性处理技术流程并进行了攻关试验工作,建立了以叠前综合多域噪声压制、多次波联合衰减、大偏移距各向异性动校正、各向异性叠前时间偏移等关键技术方法组成的处理流程。资料处理结果表明,地震剖面的成像精度显著提高,各种地质现象反射特征突出,有效地提高资料解释的准确性。     

A PREDICTION SCHEME FOR THE PRECIPITATION OF SPR BASED ON THE DATA MINING ALGORITHM AND CIRCULATION ANALYSIS

Based on the 74 circulation indexes provided by National Climate Center of China (hereinafter referred to as NCC) and the 24 indexes compiled by NOAA, the study used the C4.5 algorithm in data mining to establish a decision tree prediction model to predict whether the Spring Persistent Rains (hereinafter referred to as SPR) of 55 years (from 1961 to 2015) is more than the normal, and obtained 5 rules to determine whether the SPR is more than the normal. The accuracy rate of the test set, namely “whether the SPR is more than the normal”, is 98.18%. After evaluating the model by conducting ten 10-fold cross validations to take the average value, the test accuracy rate gained is 84%. There are differences between the three types of years with a SPR more than the normal when it comes to intensity and distribution. In spring, they have respective anomalous 850hPa monthly mean wind fields and water-vapor flux distribution, and 700hPa forms the zone where the vertical speed is anomalously negative. As indicated by the results, the SPR prediction model based on the C4.5 algorithm has a high prediction accuracy rate, the model is reasonably and effectively constructed, and the decision rules take comprehensive factors into consideration. The anomalous rainfall and circulation distribution characteristics obtained based on the decision classification results provide new ideas and methods for the climatic prediction of SPR.     

兰江流域洪涝灾害发生规律研究

根据兰江历年洪峰水位资料结合灾情分析,确定了兰江流域洪涝等级的划分标准;对兰江流域洪涝的发生演变规律进行了统计分析,得到了一些有意义的结果。     

裂隙网络多标度分形计算机模拟

岩体裂隙网络是不均匀，非对称的复杂分形，用简单分数维不能刻画其特征，必须采用多标度分形来研究，才能全面客观地描述其本质。文中介质了隙网络多标度分形计算机模拟原理与方法。     

航空伽玛测量作用带的理论研究及其应用

航空伽玛测量作用带的理论研究,将为不同地质条件下的航空伽玛测量合理地选择飞行参数提供理论依据．对保证测量质量和成果解释方面,有重要参考价值．本文从定义、计算及应用三方面作了比较详细的论述．     

“卡西尼”顺访木星

卡西尼号宇宙飞船在飞往土星的途中,于2000年10月初飞抵木星附近,12月30日从距离木星云层顶端980万千米处飞过(这个距离相当于月地距离的25倍),2001年3月才飞出木星附近区域。在这几个月期间,长西尼号宇宙飞船与伽利略号宇宙飞船一道,合力探索木星和它的众多卫星。这是人类第一次用两个探测器同时对木星进行探测。其中伽利略号宇宙飞船位     

喀纳斯自然保护区地衣生态地理分布的研究

根据1985年以来实地考察的基础上,对保护区自然地理条件和地衣生长发育的地理背景进行了分析,对地衣植被的生态地理分布规律进行了初步探讨.并对地衣植被进行了生态分类.