未知

The mechanism by which particles acquire different mass values is unknown, and finding evidence for the existence of the Higgs boson would address this fundamental mystery of nature.

该机制的粒子获得不同质量的价值是未知的，并找到证据的存在，希格斯玻色子将解决这一根本奥秘的性质。

On conditions that the dead zone model parameters and the bound of the uncertain nonlinear term are all unknown, the proposed adaptive controller can eliminate the effect of actuator dead zone faults well and ensure bounded-errors tracking.

在死区模型所有参数以及系统非线性不确定项上界均未知的情况下，所设计的自适应控制器可以很好地消除执行器死区故障的影响，保证跟踪误差有界。

Then by matching the traction along the branches and the boundary of the strip, Cauchy singular equations were obtained, in which the point dislocation and the distributed dislocation density served as the unknown function.

根据板条边界和裂纹面上的应力边界条件，建立以集中位错强度和分布位错密度为未知函数的Cauchy型奇异积分方程，利用半开型积分法则将该奇异积分方程化为代数方程求解。

In this paper we study the following free boundary value problems by means of Shooting Method.

我们所研究的这一这类自由边值问题，与一般的非线性边值问题不同，其未知函数是$，而且自由边值条件是非线性的。

The class of nonlinear systems considered is referred to as a semi-strict feedback system and includes parametric uncertainties, input gain uncertainties and the unknown but bounded nonlinear function and disturbance.

论文所研究的非线性系统是一类广泛的半严格反馈系统，系统的不确定性包括有界的参数不确定性，有界的输入增益的不确定性以及未知但有界的非线性方程和外部干扰。

Because the uncertainty of this class of system is bounded by a linear function of the norm of the delayed states with unknown bounds, an adaptive update law is proposed to estimate the square of these unknown bounds.

论证了鲁棒自适应控制器存在的条件，并给出了能适应未知参数变化且使得最终闭环系统状态一致最终有界的鲁棒控制律的设计方法。

In this strategy, the unknown nonlinear functions are approximated by the fuzzy tree model to obtain the prototype controller; the linear parameters in the fuzzy tree model are adjusted online to improve the performance of the controller in realizing the tracking control to a bounded set point input.

该方法用模糊树模型逼近非线性系统中的未知非线性函数，得到初始的控制器，然后在线调节模糊树模型中的线性参数，改善控制器的性能，实现对有界参考输入信号的跟踪控制。

This indicates that it is impossible to design a Clarke-Gawthroptype self-tuning controller or an adaptive pole placement controller for unknown nonminimumphase plants to track arbitrary bounded set point sequences asymptotically.

这表明对未知离散非最小相位系统，不可能设计Clarke－Gawthrop型自校正控制器或自适应极点配置控制器去渐近跟踪任意有界设定序列。

If we transported that box to the Grand Canyon of Arizona and balanced it neatly on the low stone wall that keep people from breaking their necks when stunned by the incredible beauty of that silent witness of the forces of Eternity, and then called little Noodle,the dachshund,and told him(the tiny beast is very intelligent and loves to oblige) to give the unwieldy contraption a slight push with his brown nose,there would be a moment of crunching and ripping as the wooden planksloosened stones and shrubs and trees on their downward path, and then a low and even softer bumpity-bumpity-bump and a sudden splash when the outer edges struck the banks of the Colorado River.

如果我们将这个盒子运至亚利桑那州的大峡谷，并将它平放在一列低矮的石头墙上，然后唤来小路德，一只猎獾狗，并告诉它（这只小兽异常聪明且乐于助人）用软绵绵的棕色鼻子轻推一下这个笨重盒子，然后便是好长一段时间的碰撞和撕扯，就好像厚木板在下滑过程中松动岩石、灌木奔向未知的天堂。

Petiole (0.5-)2-17 cm; bract apex acute to acuminate unknown in C.

叶柄(0.5-)2-17厘米；苞片先端锐尖或渐尖未知在 C。

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％。