缓坡沙坝海岸波生沿岸流不稳定性特征

为研究沙坝对沿岸流不稳定运动特征的影响,本文开展了缓坡沙坝海岸沿岸流不稳定运动特征实验和理论分析,通过对流速时间历程的谱特征和示踪图像2方面进行研究,并讨论沙坝对沿岸流不稳定运动的影响。结果表明:1∶100坡度缓坡沙坝海岸的沿岸流存在明显的周期摆动,波动周期为100 s~150 s,且规则波的波动周期略大于不规则波情况。沙坝对沿岸流不稳定运动的影响,是通过对沿岸流速度剖面的改变来实现的,沙坝控制着沿岸流速度剖面峰值位置,从而控制沿岸流不稳定增长率和运动周期,这使得沙坝海岸与斜坡海岸沿岸流不稳定运动波动周期存在差异。

社会主义市场经济理论的创新发展

经过长期的酝酿和发展,我国提出的社会主义市场经济理论已经成为社会主义国家和平时期生产发展到一定阶段后的产品交换体制选择的基本理论。党的十八大以来,我国进一步明确让市场在资源配置中发挥决定性作用和更好发挥政府作用,进一步完善了中国特色社会主义市场经济的理论内涵,为社会主义国家找到一种适合一定发展水平的经济体制作出了巨大贡献。

Exponential Stability of a Robot with Safety System

This paper presents the analysis of exponential stability of a system consisting of a robot and its associated safety mechanism. The system have various modes of failures and is repairable. The paper investigates the nonnegative stead-state solution of system,the existence of strictly dominant eigenvalue and restriction of essential spectrum growth bound of the system operator. The essential spectral radius of the system operator is also discussed before and after perturbation. The results show that the dynamic solution of the system is exponential stab＇flity and converges to the steady-state solution.