未知

First, the problem of stabilizing a given periodic orbit in a chaotic system is discussed. Then, a method for the stabilization of an unstable focus point is presented, which does not require the location of the focus point. At last, a method for the synchronization of chaotic systems using neural networks is proposed.

首先给出了使系统稳定在某个给定的周期轨道上的方法；接着讨论了如何使系统稳定在某个事先未知的不动点上；最后，提出了一种基于神经网络的混沌系统的同步化方法。

An active control method for synchronization of two uncertain chaotic systems with parameter perturbation is presented.

利用主动控制思想实现了两个具有未知参数干扰的不确定混沌系统的同步。

A new algorithm for linear array position calibration is presented. In the case of source direction-of-arrival is uncertain, by using the least square algorithm, the source DoA is estimated based on the unwrap phase of the steering vector.

针对独立校准信源波达角未知情况下的阵列位置误差校正问题，提出了一种对信号导向矢量的绝对相位进行最小二乘线性拟合，进而估计出阵元位置误差的算法。

A total of 5,653 adult participants in the third United States National Health and Nutrition Examination Surey without known diabetes underwent gallbladder ultrasonography and phlebotomy after an oernight fast for measurement of serum insulin, C-peptide, and glucose.

我们假设胰岛素抵抗而非肥胖是胆石形成的重要原因。在第三次美国国家健康与应验检查中，5653名未知是否患有糖尿病的**进行了胆囊超声与空腹血清胰岛素、c肽、血糖检测。

On the basis of ultraviolet standard detector in National Institute of Standard Technology, the absolute criterion was transferred to the responsivity unknown ultraviolet silicon detector, ultraviolet multiplier phototube and the ultraviolet solar blind photomultiplier.

以NIST(美国国家标准技术研究院)紫外标准探测器为基准，在200~400 nm波段对响应度未知的紫外硅探测器，紫外增强型光电倍增管和日盲型紫外光电倍增管进行了绝对标准的传递和光谱响应度、量子效率的标定，并在350 nm对紫外硅探测器的空间均匀性进行了标定。

Cursory investigation has yielded several ancient species of unknown origins, and entire PHYLUM FOUND OF POSSIBLY ALIEN taxonomy.

粗略的研究发现了几种未知起源的古老物种，全部属于某种外星生物结构。

An unknown contact will call you and ask you to meet at the pier.

一个未知的联系会打电话给您，并要求您，以满足在码头上。

After training by three protein superfamilies from PIR protein database,the precision of the classification of the unknown protein sequences can respectively achieve

通过对PIR数据库中三类家族的学习，该网络对未知蛋白质序列分类的准确率分别达到了98.9%，98.1%，97.8%。

The Plain Dealer book editor Karen Long said Weisman "uses the precise, unhurried language of a good science writer and shows a knack for unearthing unexpected sources and provocative facts".

卡伦龙是一个率直的编辑，他称韦斯曼运用一个优秀科学作家的准确而从容的言辞，向人们展示开拓未知领域和揭露有挑战性的事实的诀窍。

In this way, wielding a new and unknown poison, a poisoner could kill someone, and the death might be mistaken as an unfortunate case of a rare illness.

这样的话，如果使用一种新型种类的未知的毒药去下毒，被害人的死亡就可能会被错误地认为是由某种罕见疾病而导致的[23]。

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％。