未知

The problem of PI controller design for the multi-input and multi-output system is transformed to that of static output feedback controller design via the new state variable. As to the problem of the static output feedback, a new LMI-based sufficient condition of the controller is presented in this thesis. We can gain the multivariable PI controllers just solving one LMI inequality. The numerical example is provided to illustrate the proposed design approach. 3.The H_∞ robust control is able to solve the multivariable problem, also the control problem characteristic of the modeling error, parameters uncertainties and unknown perturbation, Its application research in the power electronics is beginning now. Considering the characteristics of the PWM DC-DC converters, a multivariable PI controllers which is based on H_∞ Performance Index is designed.

通过构造新的状态变量，可以将多输入多输出系统的PI控制器设计问题转化为静态输出反馈控制问题，利用后者的成熟理论来设计控制器；本文在问题转化后采用更为简便的算法，只需通过求解一个LMI不等式，就能求取基于H_∞性能指标的多变量PI控制器参数，实例验证了算法的有效性。3.H_∞鲁棒控制具有处理多变量问题的能力，可解决具有建模误差、参数不确定和干扰未知系统的控制问题；它在电力电子学中的应用研究刚刚开始。

Pursuant to this arrangement they convened their synods, but, as later became known all four gave oral explanations authorizing respectful silence on the question of fact, and it would seem that they acted thus with some connivance on the part of the mediators, unknown, however, to the nuncio and perhaps to d'Estrées.

根据这项安排，他们召开了他们的主教，但是，正如后来成为众所周知的所有四个了口头解释，授权尊重的沉默的问题，事实上，这似乎是他们采取行动，因此，与一些纵容，对部分调解，未知，但，向圣座大使，也许

The second was that the more nutritionally valuable a resource is, the more accurately its location will be remembered.

第二个是越是具有营养价值的资源，它的未知越容易被记住。

Practice innovation is the creation that has been realization and objectification .

实践创新是现实化，对象化了的创造，是对未知与未行领域的开拓。

In our obscurity, in all this vastness, there is no hint that help

茫茫黑暗中，无尽的未知，我们一点都不知道，哪里可以找到帮助。

In our obscurity, in all this vastness, there is no hint that help will

茫茫黑暗中，无尽的未知，我们一点都不知道，哪里可以找到帮助。

According to the method,a input/output off-line model and time delay parameter of a unknown time delay process is identified by ULN.The ULN that can be a neural network predictor is used for a prediction model of the time delay systems.

该方法利用本文提出的通用学习网络自适应算法对模型未知的时滞系统进行离线建模，得到该过程的输入输出模型以及系统的滞后时间，进而将辨识得到的神经网络模型作为模型预测器对时滞系统进行预报。

If using a switch card with Form C switches, this can be done by connecting an ohmmeter in place of the unknown source on each channel.

如果使用C型开关的开关卡，则可以连接一个欧姆表代替每一通道上的未知源。

But even granted that the principle of our calculation is correct, no mathematician would be able to figure out the absolute number on a basis so vague, since the number of angels and demons is an unknown quantity to us.

但即使是理所当然的原则，我们的计算是正确的，没有数学家将能够计算出绝对数字与上一个含糊的，因为有多少天使和魔鬼，是一个未知的数量给我们。

Many enterprises in advertising language issues often feel confused, in the 'change' and 'unchanged' on the horns of a dilemma,'no change' is very easy for the aging brand;'change' can very easily have unknown risks.

很多企业在广告语问题上常感困惑，在'变'与'不变'的问题上左右为难，'不变'很容易使品牌老化；'变'则很容易产生未知风险。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。