塔里木河干流治理综述

受气候干旱、水资源无序开发和低效利用等的影响，塔里木河流域生态环境日渐恶化，已成为制约流域经济发展、社会稳定等的主要问题。塔里木河干流治理的主要任务是在干流修建输水堤、生态闸和河道护岸工程，防止洪水漫溢，变无序用水为控制用水，提高该河段水资源的利用率，其作用是在满足上中游两岸生态用水和农业灌溉用水的同时，增大向下游的输水量，到2005年实现向大西海子以下河道输水3．5亿m^3的目标。根据分析计算，治理工程实施后可基本达到向下游输水5．08亿m^3的目标，堤防工程的修建可增大河道输沙量，减少泥沙淤积。同时，工程布局以及河道护岸工程建设如何根据未来河势的变化进行调整和完善，还需要进行深入的研究。     

Comparison of blockage factors in modelling the resistance of channels containing submerged macrophytes

The proportion of a river channel containing vegetation (termed the blockage factor) has historically been determined in three ways: cross‐sectional, surface area and volumetric. The first two versions are two‐dimensional measures. Meanwhile, the three‐dimensional volumetric version is biased towards deeper sections of a reach. A fourth version of the blockage factor is proposed that does not have such limitations: the multi‐cross‐sectional blockage factor. Between five and nine cross‐sections were sampled to determine the four blockage‐factor versions for 35 river sites containing the clumped submergent macrophyte, Ranunculus subgenus Batrachium (water‐crowfoot). The ability of these four measures to act as predictors of vegetative channel resistance was then assessed. The vegetated proportion of individual cross‐sections was poorly related to the vegetation resistance of a channel reach, primarily due to the high spatial variability of patch‐forming macrophytes. The weighted median of all cross‐sectional blockage factors measured at each site produced the strongest relationship with vegetation resistance, though this was not significantly better than the volumetric or surface area versions. The resistance model using the surface‐area blockage factor gave a very high residual between predicted and calculated resistance for a mat‐forming macrophyte species, and this model is unlikely to hold for conditions other than baseflow. Likewise, the volumetric version is not expected to hold for sites that have more depth variability than those measured in this study. Copyright © 2005 John Wiley & Sons, Ltd.     

长江口深水航道的选择及其治理原则

在长期系统研究的基础上，分析对比了长江口的水流动力、泥沙运动和河床演变等各种条件，选择了北槽作为长江口深水航道先予治理，确立了符合长江口实际情况的治理原则．长江口深水航道一、二期治理工程的实施，已取得了良好的治理效果和巨大的经济效益．     

ICE JAMS IN A SMALL RIVER AND THE HEC-RAS MODELING

This paper describes a model of a 3.06km long river reach between two small reservoirs under both open flow and ice covering conditions for different operational settings of the stoplogs in the downstream reservoir. The HEC--RAS model developed by the Hydrological Engineering Center of US Army Corps of Engineers was used to compare different approaches in terms of flow velocity, water level and the Froude number. The impacts of heavily vegetated main channel and floodplain on ice accumulations were investigated. And it is shown that this vegetation plays a significant role in the formation of river ice jam during winter period and thus the vegetated channel has strong influence on ice flooding. In addition, the paper explores the impact both of the operation of the stoplogs during the winter period and the presence of the downstream dam on the accumulation of ice jam along this river reach.     

PCC材料在某铀尾矿库排水斜槽维修加固工程中的应用

较详细地介绍了某铀尾矿库排水斜槽维修加固方案和PCC材料在该工程中的应用。     

数字电视关键技术探讨

在模拟电视向数字电视转变的进程中,数字化相关技术至关重要.介绍了数字电视所必须使用的几项关键技术.     

基于多版本的多级安全并发控制机制的研究

在多级安全数据库系统中，如果采用传统的并发控制机制，则通过多级事务的协作可以很容易的创建隐通道，因此我们必须研究适合于多级安全数据库的并发控制机制。本文提出了一个基于多版本的安全的并发控制机制，它能阻止隐通道的创建而不会导致检索异常和高级事务的饿死，同时还能提供一个多级事务的可串行化调度。     

三峡工程明渠截流与碾压混凝土围堰施工实践

重点介绍了三峡导流明渠截流特性和施工截流措施。碾压混凝土围堰施工实践，创造了筑坝技术的奇迹。围堰挡水发电效益也堪称水电建设之最。     

河流相储集体的精细解释与描述

河流相油气藏是我国石油勘探的主要目标之一。它的特点是储集体孔渗性好、埋深小、产量高、分布广，但河道变化频繁、相带也不稳定，给精细解释带来困难。为此，本文对河流相储集体的精细解释与描述方法开展了集中研究，并取得了一定的地质效果。首先制作河流相储集体的三维理论模型，研究该类油藏的基本特征；在此基础上，以LHK实际资料为例，分析该区河流相油藏的频带分布，提取能反映目的层频率特征的20Hz分频数据体，进行古河道的分频解释；采用抗噪性和分辨率较高的第三代相干体解释目标层段的多个河道砂体；探索用复合属性来研究地质体的可能性，并提出一种新的地震属性——级联属性，即以原始数据体中提取的地震属性为基础，从中再提取新的相关地震属性，更有利于改善显示效果。     

加强对大学生主体意识教育的思考

随着我国社会主义市场经济的不断发展和完善，人们的主体意识在进一步地强化。为使大学生今后能更加沉着主动地适应复杂多变的社会发展环境，高等学校应义不容辞地加强对学生的主体意识教育。