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结构稳定性

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This paper discusses the relations between the dip direction,dip angle of the rock structure plane and stability of the slope,in the last part,it gives further explanation about the relation between blasting construction and geography condition.

通过对岩体边坡产状与结构面产状关系的变化分析,表明爆破后的边坡的稳定性随地形的变化而不断变化。

The results indicate that the self-made anion exchange fiber has struc...

结果表明:自制的离子交换纤维具有强碱性离子交换纤维的结构特征和一定的化学稳定性。

The aluminum groove used for heat dissipation is extrusion molding by 6030 aluminum ,and through anodize precessing technic ,with scientific struction for heat dissipation design ,which can solve the problem of heat dissipation efficiently , and can longer the life-span of LEDs , In addition ,the driver power utilize constant current IC driver ,which can asure the precise of power output and the stability during the couse of using .

散热铝槽采用6063铝挤出成型,经过阳极氧化等加工工艺处理,加上科学的散热结构设计,有效解决灯管散热难的问题,大大提高 LED 使用寿命。驱动电源采用恒流 IC 驱动方案,电流输出的精度高,确保 LED 使用的稳定性。

According to the change of the enemy\'s quantity and the qualitative theory of the differential equation, we research the spruce aphides and its predator system. At the same time, we discussion the spruce aphid multiplication model when the natural enemy quantity is a certain value and the periodic oscillating model whose the quantity of the natural enemy changes along with the time. Obtains the stability condition of the balance point and the limit-cycle existing condition, the system presents the dissipative structure\'s character. Finally it explains that this theoretical analysis has certain practical significance regarding the preventing and controlling harmful insect.

第五章,松毛虫与其天敌的关系是食饵和捕食者的关系,根据天敌数量的变化,利用微分方程定性理论,研究松毛虫与天敌系统,讨论天敌数量为一定时的松毛虫增殖模型和天敌数量随时间变化的周期振荡模型,得到正平衡点全局稳定性和极限环的存在条件,通过计算机模拟,说明周期振荡的捕食模型能够呈现典型的时间耗散结构特征,对于防治害虫有一定的实际意义。

The relationship between transient response and shape design variables is highly non-linear, and the behavior of feasible domains is often not good, which may cause convergence difficulties. In order to improve convergence speed of iteration process, some algorithms the feasible domains adjusting, the adaptive move limit, the approximate line search and the approximate reanalysis, are adopted.

采用基于Newmark积分的直接求导法计算瞬态响应灵敏度,在序列二次规划算法中采用了可行域调整、近似—维搜索、自适应运动极限等改进技术,提高求解效率和收敛稳定性,以解决结构动态响应与设计变量的关系复杂、高度非线性,优化可行区域的性态不良等问题。

ABSTRACT This paper presents results of online identification of hydrogenerators, a long-term running robust self-tuning regulator of generator excitation, governor power system stabilizer decoupled in multimachine systems, and an adaptive GPSS designed in frequency domain. 1. It presents a step-by-step zero cancellation method , accuracy weighted recursive least squares and approximate RLS algorithms, inferior limit of sampling time.

针对发电机励磁和调速系统建模与控制,针对多机电力系统的稳定性,本文综述了自适应控制理论及其在电力系统中应用的现状和发展方向后,在辨识、自适应控制结构和鲁棒性提高的措施上进行了研究,取得了水轮机调速系统现场辨识的成功,获得了长期稳定运行的鲁棒励磁自校正控制器、多机解耦的调速侧电力系统稳定器和频域设计的自适应GPSS。

Base on above questions, research on the stability, the efficiency and the rationality of aqueduct.

针对大型渡槽工程设计中存在的一系列问题,通过深入细致的研究以保证渡槽结构的稳定性、经济性和合理性。

Structural features and abutments stability analysis is very important in thedesigndf arch dam.

高拱坝的结构特性及坝肩岩体的稳定性分析是拱坝设计中的首要问题之一。

The floating gates, which have a hollow cavity inside, work according to Archimedes' principle of buoyancy. When compressed air is pumped in, emptying the gates of water, the buoyancy of the giant panels will be greater than their weight, and in just 30 minutes the barrier will float above the surface. The gates are attached to the seabed with hinges, which are designed to absorb the force of waves and keep the barrier in place. The gates will only be raised when waves are higher than 1.1 meters, to reduce interruption of the sea currents to a minimum.

这些中空的水闸门,主要依照阿基米德浮力原理操作,当闸门内注入高压空气排水后,闸门受到的浮力大於闸门重量,只要三十分钟就能浮出水面,闸门底部则用轴承固定在海底,再透过细部结构设计能够悉受波动力量,保持闸门的稳定性,而水闸门只有在浪高超过110公分的时候才会升起,把对海水交换的干扰降到最低,其他维护潟湖生态的措施也获得欧盟肯定,所以在2009年4月,取消摩西工程违反自然保育法的决议。

Due to the special stability in its structure and composition,the aromatic hydrocarbon has a good correlation with hydrocarbon generation and maturity of sou...

芳烃因其结构、组成的特殊性和稳定性,在高演化阶段与油气生成及烃源岩成熟度有着良好的相关性,具有成为高演化碳酸盐岩成熟度指标的基础。

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This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

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双标记神经干细胞的增殖、分化活力与未标记神经干细胞相比无改变。