应用力学

The main contents are as follows.1 For the state control problem in closed quantum systems, according to the distance between states, the error between states and the average value of an imaginary mechanical quantity, three Lyapunov functions are chosen, respectively. The corresponding control law designs and the convergence analyses are studied. Especially, for the Lyapunov function based on the distance between states, a class of control laws that can solve the problem that an initial state is orthogonal to a goal state is designed. The convergence of the system is analyzed via LaSalle\'s principle and one method to find the largest invariant set of the closed loop system is proposed by linearizing the unitary evolution operator at the corresponding instants.

在这一背景下，本论文在指出研究量子系统控制的必要性、回顾量子系统控制理论和方法的研究现状的基础上，从控制理论的角度研究Lyapunov理论和最优控制理论对于封闭量子系统的应用以及开放系统中的若干问题，主要内容包含以下几个方面。1针对封闭量子系统中的状态控制问题，根据状态间的距离、状态间的偏差、一个虚拟力学量的均值，分别选择三种Lyapunov函数进行相应的控制律设计和收敛性分析。

The objective of this study is to develop the interactive image analysis software for clinical biomechanics of blood vessels and tumor vascularity.

本文主要目的在结合超音波动态影像传输、生物力学与视窗化软体设计，以呈现便捷与客观的临床检测应用。

Finally, four kinds of infiltration glass powder with specified color were developed successfully. The color and its stability of infiltration alumina ceramic were tested. The color match between alumina core ceramic and the Vitadur Alpha veneering ceramic were also tested. The physical and mechanical properties of infiltration glass and alumina core ceramic were investigated.

考察了玻璃渗透后铝瓷的颜色及稳定性，并与VitaIn-Ceram作对比，研究了用自行研制的玻璃粉渗透铝瓷后的颜色与VitadurAlpha饰面瓷的颜色匹配性，测试了渗透玻璃及玻璃渗透铝瓷的物理及力学性能，使CAD／CAM用玻璃渗透氧化铝陶瓷达到临床应用水平。

The three-dimensional finite element model of lumbar spine L1-L2 can be applied as a good tool in many fields in vertebral column biomechanics.

本研究所建立的腰椎L1- L2 节段的三维有限元模型是重要的脊柱生物力学研究平台，可应用于众多相关研究领域。

Based on the principle of mass-changing mechanics,this paper analyzes the process of water wheel raising water,educes its movement differential equation s in its three stages from starting to stable running,obtains solutions of the equations,and calculates on the angular velocity of the waterwheel in constant motion.

应用变质量力学原理对农用水车在提水过程中所经历的三个不同阶段，即在运动过程中水车的受力和运动量都在发生变化的情况下，对其动力学问题进行了较为深入的分析，导出了水车由起动至稳定运转三个阶级的运动微分方程，并得到了它们的解答，进而求得水车在趋于定常运动时的转动角速度。

ABSTRACT Impact machines operating by mechanical impact, which have been of very long history, play still an important role in modern industry. In shis paper, the following essential subjects of impact mechanism are systematically studied based on wave mechanics.

冲击机械具有悠久的历史，并在现代生产行业中占据着相当重要的地位，本文从冲击机械的共性出发，应用波动力学理论，较系统地研究了冲击机械原理和设计中的一些基本问题。

This article employ the new theory in the point of view of the composite system to study the mechanical equilibrium of white dwarf stars.

本文应用这一新理论，以复合系统的观点研究了白矮的力学平衡问题。

Results:Regardless of load manner,the stress of the bone around 1 were high when just healthy side implanted,but the stress reduced after implantantion in health side combined with the implantation in zygoma in defect side.

由于上颌骨缺损在解剖结构上的特殊性，缺损范围上的变异性和不确定性，以及赝复体形式的复杂性，使得应用有限元方法对其进行生物力学研究具有特殊困难[6]。

Quantum chemical and molecular mechanical methods were employed to study the acylation in the acetylthiocholine hydrolysis catalyzed by acetylcholinesterase.

应用量子化学和分子力学方法研究乙酰胆碱酯酶催化硫代乙酰胆碱水解反应中的乙酰化反应，计算了反应物、过渡态、产物及中间体的几何结构及电子结构。

To research the nonlinear dynamic characteristics of the complex aerocraft structure system, it is useful to monitor its health status, which is of great significance in engineering practical uesage and theoretic analysis.

对这种复杂结构的非线性力学分析和健康状态的监控研究，不仅具有前瞻性理论意义，更具有深远的工程应用前景。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。