系统的

The board has the merit of simple structure,casc to extension,high accuracy,low cost and high reliability.

该采集板卡硬件系统组成简单，扩展了通信接口，满足测量精度，降低了系统开发成本，而且提高了系统的可靠性。

In this paper, the configuration of motorized spindle is studied and the procedure of direct torque control for motorized spindle is investigated, and the system principle sketch map is drawn.

结果 建立了高速电主轴直接转矩控制系统仿真模型，完成了仿真系统调节器及其参数设计，对系统的恒定负载和负载变化两种情况进行了仿真研究。

So, When the power system is in transient, the sliding mode control rule is chose directly to make transient component decrease quickly, and when the power system is in stability, the direct current control method based on voltage space vector method is imported to make the error current reduce to zero by inches and avoid surge.

为此，当系统处于暂态时，论文直接选择滑模控制率使暂态分量迅速减小，当系统处于稳态时，引入基于电压空间矢量的直接电流控制方法，使误差电流趋于0缓慢变化，在有效补偿系统无功的同时，提高了系统的动态特性，并大大降低了系统振荡的可能性。

In this paper, basic idea of SMI methods is presented at first.

这类方法综合了系统理论，线性代数和统计学三方面的思想，其特点是直接由输入输出数据辨识系统的状态空间模型，因而非常适合多变量系统辨识。

The solution for the non-stationary system is obtained through the stationary disturbed system. The gradients of the system performances to all design variables are derived and they can be used to obtain optimal solution of the systems. More generally, if the performance of the system is a function of the solution of a set of generalized Lyapunov equation, then the gradients of the performance function to the coefficient matrices of the equation can be found in closed form.

文中显示，非静态干扰系统的解可由静态干扰系统求得，而此干扰系统之最佳解，则经由本文所推导的对所有设计变数之系统性能函数梯度获得；一般而言，如果系统之性能函数是一组通式化 Lyapunov 方程式解的函数，则此方程式的系数矩阵之性能函数梯度，可用封闭解表示之。

" System Security Warning " is a spoof system alert from scareware System Security.

" 系统安全性警告"是一种欺诈警报系统从scareware系统的安全。

By integral equation theory, the existence and uniqueness of the model solution is proved, and then its asymptotic stability under the condition of stationary state is also discussed.

为了更详细地刻画经济系统，本文第五章在宏观经济系统中引入了时滞，给出带有时滞经济系统的分布参数控制模型。

Could fail. If the filesystem in question has data or media errors of some kind, mount mayreport it is unable to read the filesystem's superblock, which is (under Unix-like filesystems)filesystem as a whole. If you attempt to mount a CD-ROM or floppy drive, and there's no CDROM

如果文件系统有数据或媒体错误等问题的话，mount会报告不能读取文件系统超级块（UNIX类文件系统的下的），它是文件系统的一部分，大体上是用来为文件系统存储文件和属性信息的。

In this dissertation, periodic impact motions in vibro-impact systems are studied, and the existence and stability of superharmonic periodic impact motions are obtained. The critical bifurcation parameter intervals of superharmonic periodic impact motions are deduced, and numerical simulations are used to verify the results.

中文题名碰振或约束系统的全局分析及稳定性研究副题名外文题名 Studies on global analysis and stability in vibro-impact or constraint systems 论文作者张彦梅导师陆启韶教授学科专业一般力学与力学基础研究领域\研究方向学位级别博士学位授予单位北京航空航天大学学位授予日期2002 论文页码总数95页关键词碰振系统转子系统多体系统碰撞振动馆藏号BSLW /2003 /O322 /1 本论文讨论了碰撞振动系统的周期碰撞运动，得到了超谐周期碰撞运动的存在性和稳定性，推导出亚谐周期运动的临界分岔参数区间，并利用数值模拟进行验证。

It can superinduce the real feeling during the driving simulation, which is the particular characteristic of the newfashioned training system distinguished from the training system in existence.

与现有车辆模拟驾驶训练系统相比，新型车辆模拟驾驶训练系统的独特之处是增加了动感系统。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。