查询词典 symmetry

It is proved that -1 couldnt be the eigenvalue of Jacobian matrix of Poincare map at fixed point by the analysis of the symmetry of the system.

第三章分析了一类两自由度碰撞振动系统的周期运动，并通过计算Poincare映射的线性化矩阵，确定周期运动的稳定性。

However, Synthetic saddle trees are becoming increasingly popular (Bates, Kieffer, Prestige are all examples), and these now offer great strength, reliability and total symmetry.

Synthetic 综合马鞍 Tree 正逐渐流行（ Bates，Kieffer，Prestige 等均使用此），原因就是这类产品可以具有更好的强度，可靠性以及完美对称。

Now we have succeeded in generalizing the method to non-planar strips with toroidal and Klein bottle strips by taking into account the rotational symmetry of these strips.

考虑具有环形和Klein bottle边界条件所具有的旋转对称性，如今我们巳成功地将这个方法进一步推广到这些非平面的长条。

Development of OA kneepad : The kneepad density-wave output can be controlled by 2Hz different frequencies to 300 Hz stimulation pulse component, the pulse width of 100 to 150 μ s between the positive and negative output symmetry to the stimulation pulse. The rechargeable mobile phone batteries ( 3.7V) were served as power supply and SCM as timer with automatic shutdown after 30 minutes.

OA护膝的研制：护膝输出的疏密波可控制由2～300Hz不同频率刺激脉冲组成，脉冲宽度在100～150μs 之间，输出正负向对称的刺激脉冲，采用可充电的手机电池(3.7V)供电，单片机定时，30min 自动关机。

Therefore, restoring the chiral symmetry in lagrangian come out to be very important.

因此组份夸克模型中一个重要的问题就是要在拉氏量中恢复手征对称性[31]。

We design a square lattice photonic crystal symmetry resonant cavity four-channel optical filter, the filter efficiency of every channel is high than 96%.

根据该条件，设计出正方晶格光子晶体对称式谐振腔四信道光滤波器，各信道滤波效率均高达96%。

According to the VESs analysis, the intrinsic brittleness of Fe〓Al is due to less lattice electrons, bondcomplex distribution heterogeneity, hydrogen-induced embrittlement, and the difficulty in recovery of the lattice symmetry, while various alloying elements have strengthening and toughening effects through altering the VES parameters.

运用固体与分子经验电子理论建立起Fe〓Al合金各相的价电子结构，在计算中，首次尝试利用TFD模型确定Fe〓Al的原子杂阶，针对不完全有序的B2-Fe〓Al提出"局部平均原子模型"，对Fe〓Al的室温脆性从电子理论上进行了系统的阐述，认为较少的晶格电子、键络分布不均匀、氢致脆性和难以恢复晶体的对称性使Fe〓Al具有本质脆性，合金化元素可以在一定程度上改变价电子结构参数而改善强度和韧性。

GENERAL APPEARANCE : Strong, square-looking dog of great symmetry and overall soundness. Absolutely free from legginess, profusely coated all over. A thick-set muscular, able-bodied dog with a most intelligent expression. The natural outline should not be artificially changed by scissoring or clipping.

总体外观：强壮、侧面呈近似正方形和叫声洪亮，拥有覆盖面积大、丰厚而有质感的被毛，四肢修长；结实的肌肉，动作具表现力，给人极为聪明的印象；其自然轮廓不应被人为修剪所破坏。

Based on the methods of Lie group theory, we redefine the general workspace of the symmetry coordination methods.

特别是定义出能够连续描述刚体在空间旋转的姿态向量，避免了欧拉角描述方法所带来的旋转次序问题。

In Chapter 2 is concerned the Lie point symmetry group of two type WKI equations based on the motions of plane and space curves by using the Lie classical method.

通过研究平面和空间曲线的运动，得出两类WKI方程，并利用李的经典方法，得到相应的李点对称群。

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％。