三峡工程建设中若干重大技术问题的突破

三峡工程规模巨大，技术复杂。文章介绍了三峡工程建设在大江截流和混凝土防渗墙施工技术、大坝混凝土快速施工新技术、船闸高边坡施工技术、电站大型钢衬钢筋混凝土压力管道和蜗壳保温保压技术、沥青混凝土心墙、船闸金属结构、水轮发电机组等重大技术问题上的突破。     

浅谈黄土高原重点水土流失区的林业生态工程建设

黄土高原重点水土流失区林业生态工程建设的现状可以用“三低”（造林成活率低、保存率低、林木生长率低）来概括，人工林具有矮化，纤细，低产，烯疏4个特征，自然条件，适地适树、苗木质量、造林技术、抚育管护等5个方面的问题是造成“三低”的主要原因，适地适树适法是现阶段防治中造林“三低”的主要技术途径，其核心是“林水平衡”合理布局，适地适树，重视经济树种、抗旱造林以及加强病、虫、鼠、免、牛、羊、危害防治，是搞好区内林业生态建设的主要技术措施。     

The costs and benefits of tonal centers for chord processing.

Harmonic priming studies have shown that a musical context, with its established tonal center, influences target chord processing. This study investigated costs and benefits of priming tonal centers for target processing by adding a baseline condition (sequences without a specific tonal center). Results confirmed harmonic priming, with faster processing for related than for unrelated and less related targets (tonic chord, out-of-key chord, subdominant chord). Comparing targets in baseline contexts with targets in sequences with well-established tonal centers revealed a benefit of processing for related targets but a cost of processing for unrelated and less related targets. Findings are discussed in terms of tonal knowledge activation and suggest that an activated tonal center gives rise to strong expectations for the tonic. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

项目成功的几个关键原则

从项目和项目管理的定义和概念出发，提出了一个运作成功的项目应该遵循以下几个关键的管理原则。     

622Mbps ATM网络线路加密机设计构想

介绍了一种可以加密ATM网络的声音、数据、图像信息,其上限速率为622Mbps的ATM网络线路加密机设计构想,设计构想考虑了密钥管理功能的实现。     

依靠弯道控导河势流路

在天然河道中，河势演变虽具有一定的随机性，但仍有一定的规律可循，在一个河段内，一般可归纳出2－3条基本流路，为控制河势变化，需要选择出一条基本流路进行河道整治，当连续发生枯水期或洪水期时，部分河段的河势可能出现大的变化，为防止不利河势向下游传播，可修建较长的龙头弯道工程，利用龙头弯道工程分段调整，控导河势，保持河势稳定。     

也谈轻型钢结构房屋柱基设计

对柱脚抗剪键的设置和计算中所取用的荷载组合提出个人观点,同时对轻钢结构柱脚螺栓受拉计算提出注意事项.     

基于"替换法"的汉字加、解密实现技术

文章讨论的基于“替换法”的汉字信息加、解密实现技术,改变了传统的汉字加密结果,使加密后的密文仍是可以识别和再利用的汉字,发送者可以在任何可编辑汉字的通讯设备上发送和接收密文,确保中文信息传输过程中的安全性。加、解密算法实现的代码语言为VFP6.0。     

IP电话的实现及其关键技术

IP电话在推出后短短十年的时间以其低价、高效、灵活的特点迅速发展起来。本文介绍了IP电话的基本结构，比较了IP电话与普通电话的优缺点，讨论了IP电话的相关协议及关键技术，在这些基础上进一步指出IP电话的发展趋势，相信IP将成为未来信息通信的主导技术。     

Interactive key frame selection model

Video summarization can provide a fine representation of the content of video stream and reduce a large amount of data involved in video indexing, browsing, and retrieval. Moreover, Key frame selection is an important step in the research of content-based video analysis and retrieval. Although there exist a variety of methods for key frame selection, they are heuristic and closed systems, which cannot dynamically generate video summary with user’s preference. In this paper, an M-estimator and epipolar line distance constraint camera motion estimation algorithm is introduced as camera parameters is an important motion feature for key frame selection, and Broyden-Fletcher-Goldfarb-Shanno (BFGS) method is applied to optimize estimated parameters. Moreover, since Interactive Computing is a novel-computing model that represents the transition of algorithm to interaction, an interactive model of key frame selection (IKFS) is presented as a result of improving the model of key frame selection (KFS). The model of KFS and IKFS are proved to satisfy the criterion of induction and coinduction, respectively. Experimental results show that the processing scheme generates flexible and desirable summarizations whose distortion rate is lower than current method. Above all, IKFS is an extension to KFS.