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By means of generalized Lyapunov function and linear matrix inequality,the asymptotical stability with zero solution is studied for the system,and a sufficient condition is given such that the system is asymptotically stable with zero solution and also a H∞ norm constraint .

针对非线性离散广义系统研究了状态反馈H∞控制器的设计问题,利用广义Lyapunov函数和线性矩阵不等式,首先对系统的零解渐近稳定问题进行了研究,并在此基础上给出了系统的零解渐近稳定且具有H∞范数约束的充分条件,之后设计了状态反馈H∞控制器,使闭环系统具有同样的性能,最后给出了数值算例说明本文结论的有效性和可行性

In order to study the negativesequence influence to regional power grid caused by autotransformer traction power supply system, formulas of NSeq current and threephase voltage imbalance were derived, based on current distribution analysis of AT traction power supply system and singlephase VVconfiguration train substation. Employing the "train diagram" method, the realtime voltageimbalance curve was obtained in a simulation study, as well as the factors that influence NSeq and some measures to restrain it.

为研究自耦变压器牵引供电系统对地区电网造成的负序影响,首先讨论了AT牵引供电系统、单相VV接线牵引变电站的电流分布,推导得出了负序电流、三相电压不平衡度的计算公式;然后结合"列车运行图法"开发了相应的仿真程序;最后通过一个实际算例,得到了实时电压不平衡度曲线,指出了负序大小的影响因素及相应措施。

Weak formulation of equilibrium equations including boundary conditions of laminated cylindrical shell are presented, and thermal stresses mixed state equation for axisymmetric problem of closed cantilever cylindrical shell is established.

导出层合柱壳轴对称问题的平衡方程和边界条件的弱形式,提供了方程和边界条件放在一起的算子形式,建立了悬臂柱壳轴对称问题的热应力混合方程,给出了正交异性层合悬臂柱壳在热荷载和机械荷载作用下的弱形式解·本文提出的方法弱化了求解方程和边界条件,化解了问题,具有一般性并便于推

We have obtained the following main significant results:(1) A master constraint operator for LQG is constructed, which is shown to be self-adjoint in the diffeomorphism invariant Hilbert space. Thus it lays a foundation for the master contraint programme in LQG;(2) The Immirzi parameter ambiguity in LQG is fixed by introducing supersymmetry, which leads to the conclusion that in the case where matter fields are coupled LQG might prefer supersymmetry in low energy;(3) The current accelerating expansion of our universe is successfully explained in the context of 5-dimensional Brans-Dicke theory, which gives a natural strategy to solve the dark energy problem.

重要成果包括:(1)构造出圈量子引力的Master约束算符,并证明了其自伴性,从而为应用Master约束方法解决量子动力学的难题奠定了基础;(2)通过引入超对称合理地固定了Immirzi参数,得出了在与物质场耦合的低能情况下圈量子引力可能偏爱超对称的结论;(3)用五维Brans-Dicke理论成功地解释了当今宇宙的加速膨胀,从而给出了一个自然解决暗能量问题的方案。

The forward kinematics is analyzed by choosing one of the mechanisms which have one, two,three or zero angle constraint.Wherein,3-CCC is a new parallel mechanism which has three angle constraints and three distance constraints, Calay\'s formular and direction cosine matrix are used to describe the rotation matrix respectively.By setting Dixon\'s and Sylvester\'s resultant with the three angle constraint equations respectively and using parameters replacement to deal with the distance constraint equations,the 64 order input-output equation of the forward kinematics is obtained under both of the methods.Numerical example confirms these theretical results and the motion simulation is shown in VC++ by integrating OpenGL.

3对高小山提出的广义并联机构进行了研究,以其中具有角度约束的并联机构进行了分析,选取具有一个、两个、三个和零个角度约束类型中各一个机构进行了运动学正解求解,其中3-CCC是一种全部由圆柱副构成的具有三个线线角度和三个距离约束的新型并联机构,文中分别用Calay公式和方向余弦两种旋转矩阵建模方法对其位置正解进行了分析,通过对三个角度约束方程分别构造Dixon结式和Sylvester结式,以及对三个距离约束方程进行变量代换分别导出了位置正解输入输(来源:4040ABC论文网www.abclunwen.com)出方程,得出64组位置正解,并使用数值算例验证了其全部根。

During the calculation the results got by quintic spline kernel was the best so it was chosen as the proper kernel for the SPH simulation. By comparison of the simulation results got by SPH and finite volume method, it was proved that the buffer cells method proposed in the SPH simulation to implement the Dirichlet boundary conditions was accurate, and this is of great importance for the simulation of flows pass a pipe. At last, the SPH method was improved to simulate the liquid-solid two phase flows and the results show that this method was appropriate for the simulation of flows containing viscous fluid and macroscopic solid components. Now the two methods are both able to predict the continuum flows and rarefied flows severally, but the hybrid program still has some aspects to be improved.

首先用标准算例验证了SPH方法的理论模型和计算程序的准确性;通过比较确定选用五次样条核作为计算低雷诺数下的粘性连续流动时的核函数;采用SPH方法和有限体积法分别对同一管道流动进行了对比计算,证明了本文提出的边界缓冲区方法在实现SPH方法中的流体边界条件时的有效性,解决了SPH方法模拟管道流动时的一个关键问题;巧妙地使用SPH方法对化工分离流动中常见的固液两相流及固液耦合作用进行了模拟尝试,获得了较好的结果;在跨尺度计算方面,目前两个子程序已经能够分别模拟连续的和稀薄的二维管流问题,二者的耦合计算程序还处于调试和优化阶段,各个参数对于计算精度和计算速度的影响规律仍在探索中。

First, theoretical analysis methods were used for the static analysis of the suspension bridge. The formulas for endogen force of the asymmetry suspension bridge through elastic theory were deduced and they were contrasted with those of the normal suspension bridge. The basic differential equation of deflection theory was deduced and the method of getting the roots of the equation was offered, and some simplified methods for deflection theory were presented.

推导了非对称式悬索桥弹性理论的内力计算公式,并对比了其与对称式悬索桥弹性理论的内力计算公式的异同;推导了非对称式悬索桥挠度理论的基本微分方程,并且给出了部分均布荷载作用下基本微分方程的试算方法;提出了挠度理论的几种简化计算方法。

This paper discusses the nonlinear inversion algorithms instructively andmainlystudytwokinds ofnonlinearinversionalgorithms: SimulatedAnnealingConjugate Grads and Artificial Neural Network Genetic Algorithms, these two methods can decrease the iteration times and avoiddroppinginto the local extremum, we do the model calculation and confirm thevalidityofthealgorithm.

对非线性反演算法进行了有益的探讨,主要研究了两种非线性混合优化反演算法:模拟退火共轭梯度混合反演和神经网络遗传反演算法,两种混合算法都达到了减少迭代次数、避免陷入局部极值的目的,并进行了模型试算,验证了算法的有效性。

Guidance is a cat and mouse game between an overweight man in his fifties and the young Carl Arendsen, who wants to establish himself as a therapist. In the opening scene, we see Carl be inspired by a confrontational workshop. The man in his fifties is Roy Blomberg, who was wrestling with a plethora of psychosomatic complaints and has been home for 18 months. The locum who replaces his general practitioner one day is convinced that Roy's problems are between his ears. Roy's wife happens to meet a self-assured Carl, who adopts an unconventional methodology. After a little pressure, the husband gives in to his wife and withdraws with Carl to his spartan hut in the Swedish countryside.

这是38届的鹿特丹国际电影节,我在到了影院之后,拿了份schedule看,但是荷兰文,看不懂,故放包之,这次在电影节上映的电影大部分都是一些非主流的电影,不是那么商业化,唯一让大家都知道的估计就是《Slumdog Millionaire》了,至于其它的电影,我在看了好多好多海报之后,都不知道几部,最后晃了半天,我决定看一部叫做《Guidance》的电影,我之所以选这部是因为在那个时间段要放的几部片子我都不懂片名,它们像是西班牙文又似葡萄牙文还似法文貌似又像意大利文,最后没办法,我只认识Guidance这个单字,票价9欧,还算合理。

Firstly, the generalization of Fan-Ha section theorem and a general vector variational inequality without convexity assumption and minimax theorem of vector-valued function are obtained. Then, the quasi-montone vector variational inequality problem is concerned. Cx-quasi-monotone operator is defined in topological vector space, inner point of a closed convex set K is introduced, the relation between inner point and relative algebraic interior point is given, an existence result for quasi-monotone vector variational inequality is obtained.

第三章主要研究了向量变分不等式和极小极大定理(来源:3282AB83C论文网www.abclunwen.com),建立了广义的Fan-Ha截口定理、新的向量变分不等式与极小极大定理,并在拓扑向量空间中定义了C_x-拟单调算子,引入了闭凸集K的inner点,给出了inner点与相对代数内点的关系,利用innK_c代替K的拓扑内部,建立了新的拟单调向量变分不等式。

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推荐网络例句

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。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力