压下

With a rational dynamic model established on basis of the structural features and constraining conditions of the annular plate installation and through Duhamel's integral solution of Lagrange motion equation,the impact load and dynamic response of surface casing cementing unit induc.

根据表层固井环板装置的结构特点和约束条件，建立了合理的力学模型，应用杜哈默积分求解拉格朗日运动方程的方法，对固井碰压状态下承受冲击载荷及其动力响应问题进行了分析。

"My feet are languid with the burden of my heart, and I stand still in the shadow."

"我的脚被我沉重的心压得疲倦了，我就在树影下凝立着。"

"My feet are languid with the burden of my heart,and I stand stil in the shadow."

我的脚被沉重的心压得疲倦了，我就在树影下凝立着。

In order to control the flow separation by reducing the diffusion factor and enlarging the diameter of inner circle, the meridian plane profile of the return channel was redesigned, which is achieved by substituting arbitrary curve for the circle with no change of the axial length of the stage. Bezier curve with eight parameters was chose to describe the shape of meridian plane profile, and the optimization of the meridian plane profile was implemented combining back-propagation neural network with genetic algorithm.

改进的主要思路是减小弯道前半部分通道的扩压度，并同时加大弯道出口内侧的转弯半径，主要做法是在不增加整级轴向尺寸的前提下，用任意曲线取代传统弯道的同心圆环结构，给定弯道回流器子午型线的外侧型线，采用Bezier曲线对内侧型线的2段曲线进行参数化描述，利用遗传算法和反向传播(back-propagation，BP)神经网络相结合的方法对内侧型线进行优化，得到新的弯道回流器子午型线。

This model can describe the linear Darcy s flow and the nonlinear flows including low-permeability and high-permeability flow in fracture.

该模型可用于双重介质或单重介质地层压裂前后生产动态的模拟，既能描述线性的达西渗流现象，又能描述低渗透和高渗透两种情况下的非线性渗流问题。

Carbon dioxide is added to this liquid under high pressure.

在高压下， CO2被压入上述混合液中。

In order to effectively decrease integral saturation, lower down the sensitivity to noise, make the piezoelectric micro motion worktable response quickly with small overshoot and get high accuracy under control system, the control arithmetic with feed-forward compensated integral and weighted differentiated PID has been created.

为有效地减小积分饱和并降低对扰动的敏感性，使压电微动工作台在控制系统的作用下，响应快，超调小，稳态精度高，构造了一种带有迟滞非线性模型前馈补偿的弱积分与加权微分PID控制算法。

In this case the valve outlet mach number is 0.4andthe valve noise level is approximately 85 dBA.

在这种情况下，阀门的出口马赫数为0.4，阀门的声压级约85分贝。

2As for cement-soil of different dates or formula, it is shown by the results of testing that their macrophysics indices correlate closely with the structural indices. Moreover, the micro-structural change under the unconfined compression is revealed.

分析了不同龄期、不同配方下的水泥土样宏观力学指标与其微结构参数——平均结构因子' F 、各向异性系数 A 、平均形状因子' f 的紧密相关关系，同时揭示了水泥土芯样在无侧限抗压过程中强度破坏的内在微观机理。

Furthermore, macrostructure and microstructure of local section were observed by OM, which were compared with simulated results.

通过对实际压铸件局部剖面及其在光学显微镜下微观组织的观察，对模拟结果进行了验证。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。