一类生态系统的定性分析

建立了一类更为广泛的生态模型，并对该模型进行了定性分析，得到了系统的全局稳定性，解的有界性和极限环的存在性与唯一性。     

一类带有强耗散项非线性BBM型方程整体解的衰减估计与熄灭行为

考虑带有强耗散项ＢＢＭ型方程的初边值问题和周期边初值问题。首先用先验估计和Ｇａｌｅｒｋｉｎ方法证明了这二类定解问题整体可解，之后进一步讨论了这种解的衰减和熄灭性质。     

非线性椭圆型方程混合边值问题解有界模估计

本文用比较原理与构造辅助函数得到拟线性椭圆型方程混合边值问题解的有界模估计,以及Moser迭代法导出散度型椭圆混合边值问题弱解的有界模估计。     

组合杆的过屈曲状态

本文讨论由两根弹性细子杆装配组成的复合直杆在端部推力作用下的屈曲问题。证明了线性化问题的所有特征值都是单的并给出了分支解的渐近展式。最后，利用解的波型结构讨论了解的全局性态。     

气候变化的观测事实与未来趋势

全球气候正经历着明显的变暖过程。本文总结了国内外气候变化研究的主要发现,特别对国内近几年的研究和评估结果做了简要介绍。研究发现,无论是观测到的过去变化,还是预估的未来趋势都表明,中国地表气温的增暖均比全球或北半球明显。但是,目前还不能对过去气候变化的原因给出明确的解释。对未来气候趋势预估的可靠性也还比较低。如果过去50年的气候变化确由增强的温室效应引起,同时预估的未来趋势也是可信的,那么人为引起的气候变化及其影响就是一个非常严重的问题,必须给予更严肃的考虑。     

A transaction management model supporting service grids

Service grids possess the features of intelligence and automation to compose heterogeneous resources and will be a commercial focus in network economy pattern. However. service grid business is loosely-coupled, distributed and long-running, so there is a real challenge for the researchers to provide consistency and reliability for service grid business. This paper references the transaction management methods in Web service and the safepoint concept in workflow system. combines with the feature of the service grid. and then presents a transaction management model based on service grid. This model guarantees the robustness of grid service composition and assures that service grid enabling system provides consistent and reliablc rcsuhs for the consumers.     

序列图像帧间预测技术的研究

在视频压缩领域,帧间预测技术占有十分重要的地位。在简要介绍两种帧间运动估计/补偿模式基础上,该文重点讨论了局部运动估计中块匹配算法的应用和Sprite编码中的全局运动估计算法,提出一种"改进的分级块匹配法",并结合Sprite编码实现序列图像帧间压缩。大量实验表明,采用这种局部和全局相结合的预测算法,可以减少搜索时间,提高图像压缩质量和压缩比,是视频压缩可以输出甚低码流的有效手段之一。     

Issues and prospects of belowground ecology with special reference to global climate change

The theory of ecology is based on over 100 a of research and investigation, all centered on aboveground patterns and processes. However, as contemporary ecologists are increasingly acknowledging, belowground structures, functions, and processes are some of the most poorly understood areas in ecology. This lack of understanding of belowground ecological processes seriously restricts the advance of global change research. The interdisciplinary field of belowground ecology began to flourish in the 1990s, along with the expansion of global change research, and quickly gained momentum. Belowground ecology aims to investigate belowground structures, functions, and processes, as well as their relationships with corresponding aboveground features, emphasizing the responses of belowground systems under global change conditions. Key research areas include root ecology, belowground animals, and soil microorganisms. This review summarizes and analyzes the relationships between aboveand belowground ecosystems, root ecology, root biogeography, belowground biodiversity, as well as research areas with particular challenges and progress. This commentary emphasizes certain theoretical issues concerning the responses of belowground processes to global change, and concludes that belowground ecology is a critical research priority in the 21st century.     

一类广义kdv的整体吸引子

通过对广义kdv方程的初值问题的整体解关于时间t作一致估计,得到了解的整体吸收集,从而证明了其整体吸引子的存在性.     

大坝背管混凝土裂缝全局优化网络的预测研究

基于人工神经网络的全局优化方法的基本理论,对钢衬钢筋混凝土压力管道外包混凝土结构裂缝预测进行了研究,提出了基于神经网络的管道混凝土裂缝预测模型.并重点研究了水头的变化对压力管道混凝土最大裂缝宽度的影响,最后对三峡电站压力管道混凝土结构裂缝进行了预测.