开发红水河,为实施西部大开发战略作贡献

珠江干流西江上中游河段红水河,自南盘江黄泥河口至黔江大藤峡,是水力资源是集中的河段,红水河梯级开发,不仅有巨大的发电效益,而且还担负着珠江流域防洪工程体系调控制上游洪水的重任;红河河还是沟通流域东、西部的水运通道之一。加快红水河水利水电开发,交赤新世纪珠江流域经济发展创造条件,保障新世纪珠江中下游防洪安全,促进流域东、西部地区经济协调发展。龙滩水电站、水藤峡水利枢纽为红水河综合开发的两个战略性工程     

海上多次波的交互模拟

通过射线追踪计算模拟海底多次波、层间次波及全程多次波。计算模拟在工作站上通过交互菜单管理。针对南海珠江口盆地南部多次波严重地区的地质模型,进行了模拟试验。根据与实际的炮集记录和零偏移记录的对比可以判定测区深部的反射为有效波,而不是多次波。     

泛珠江流域水资源可持续利用对策

泛珠江流域天然水资源较为丰富,但由于人口的增长和经济的发展,泛珠江流域水环境问题日益严重,出现了缺水和水污染严重等问题。论文对比分析了泛珠江流域的水资源现状,并从加强区域合作、合理分配水资源,推行清洁生产、建立珠江流域系统管理与控制体系等方面对区域水资源的可持续发展提出了建议,指出了开源与节流是珠江流域用水可持续发展的对策。     

Correlations between jointing and seismic velocities in highly fractured rock masses

The paper presents the results of a study of heavily fractured calcareous rock masses outcropping in southern Italy based on both the unidimensional joint frequency (Nl) and rock quality designation (RQD) of rock cores and seismic velocity data from laboratory and down-hole tests. The in situ longitudinal wave velocities (v) were always very low and were correlated with both Nl and RQD. Between 1 and 2 km/s, small increases in velocity were associated with a considerable decrease in Nl and significant increase in RQD value. A velocity of 1.22 km/s corresponded to an RQD value of 0. The study indicated that the simple correlation proposed by the International Society for Rock Mechanics to evaluate the RQD from the unidimensional joint frequency can underestimate the results for heavily fractured rock masses, but that good correlations can be obtained between RQD and seismic velocity. Electronic Publication     

模拟酸雨对土壤中Zn的释放与缓冲作用研究

研究了模拟酸雨淋溶过程中南方主要土壤锌释放量与缓冲机理。结果表明,土壤中存在两个缓冲体系,pH值高于3.0时,土壤以初级缓冲体系为主;pH值低于3.0,尤其是离子淋溶量高于或接近CEC值后,次级缓冲体系成为主要的质子缓冲源。淋溶液pH值的降低可加速Zn的释放,从而促进土壤中Zn的淋溶,但Zn的淋溶同时受到吸附、沉淀与转化过程及土壤初始条件的影响。     

建设高效节能的现代化南方电网

介绍南方电网的现状与特点，总结建设高效节能的现代化南方电网所取得的成绩，提出今后的发展策略和工程技术规划。     

基于PLSR的中山市水资源压力演变特征与趋势

以珠江三角洲腹地城市中山市为研究目标,分析城市社会经济发展多个指标对水资源压力的影响,并利用偏最小二乘回归（PLSR）方法对1991年以来中山市水资源压力的演变特征和趋势进行分析和预测。结果表明,节水水平和第三产业发展是中山市水资源压力的主要影响因素。1991-2011年间,中山市的水资源压力整体上呈先降后升的变化趋势,并将可能在今后20年的时间内保持上升趋势。中山市水资源压力与人均GDP之间则呈现出N形环境库尔兹涅曲线特征,表明随着经济发展到一定程度,中山市水资源压力将有所下降,但同时也面临着重新上升的压力。     

THE UNSOLVED MESSAGES OF PEARL HARBOR

In 1941, the United States Navy intercepted enough Japanese naval messages to predict the attack on Pearl Harbor if the code which protected them had been solved. The messages would have disclosed that, while the Japanese government cynically conducted diplomatic negotiations with the United States, the Japanese Combined Fleet under Admiral Isoroku Yamamoto, beginning as early as September 1941, systematically prepared ships, crews, weapons, tactics, and a complicated fuel supply system for the most ambitious operation ever undertaken by the Japanese navy. Details of Japan's intentions were hidden from Navy cryptanalysts because of limited manpower resources and because all Japanese navy codes were assigned a lower priority than Japanese diplomatic codes and German submarine threat.     

海潮模型在珠江口潮位预测中的精度评估

结合卫星测高技术的海潮模型能方便、精确地模拟大洋潮汐,可用于缺乏观测资料的地区。为评估该方法在珠江河口潮位预测应用中的精度,本文采用NAO.99b、OTPS和WWT等3种海潮模型预测珠江口不同验潮站的潮位过程,与实测数据对比并计算误差均方根。分析结果表明,海潮模型可以较好地预测珠江河口区潮汐基本时间特征,潮位预测精度在一定区域、一定时段不低于传统的预测方法。口门附近尤其口外的预测精度明显高于口内;在洪水期精度下降但口外开阔区域影响较小;在口门处,潮优型河口湾的预测精度高于径流型河口。3种模型中,推荐使用WWT。     

PEARL HARBOR AND THE INADEQUACY OF CRYPTANALYSIS

American codebreakers achieved remarkable success in solving Japanese codes, but could not prevent the surprise attack on Pearl Harbor because the Japanese never transmitted anything about the attack on the airwaves.