双动

The kinetic theory based two-fluid model was used to simulate 2-dimensional fluidized beds with the width of 0.2 m, 0.4 m and 0.8 m,respectively, covering regimes from bubbling to turbulent fluidization.

应用基于颗粒动理学的双流体模型系统地对床宽分别为0.2、0.4、0.8 m的二维流化床在鼓泡区和湍动区的气固两相流动行为进行数值模拟。

In the first part, we report the application of a set of parallel dual tweezers, one stationary and one movable, to trap a polystyrene bead (suspended in de-ionized water) and drag it away from one of the trap centers beyond the linear (Hooke's spring) regime, to probe the nonlinear optical force constants associate with the optical trap.

在第一部分，我们建立了一个包含一道不动雷射光与一道可动雷射光的平行双道光钳，由此光钳钳住并移动悬浮於去离子水中的聚苯乙烯小球，使小球与其中一道光钳中心的距离远超出光钳的线性范围，来探讨光钳的非线性效应。

Methods In animals test,we made canine small saphenous or external jugular vein into double vascular bridge, which single and both ends were all trousers-style with one opening and transplanted between iliofemoral artery and vein separately and took as bridge-style blood vessels of artery and vein shunt,and detected the blood flow.

在动物试验中，将犬的小隐或颈外静脉制作成单根和两端均为裤式单开口的双血管桥，分别移植于髂-股动、静脉间和作为动、静脉转流的桥式血管，进行血流量的检测。

Methods In animals test,we made canine small saphenous or external jugular vein into double vascular bridge,which single and both ends were all trousers-style with one opening and transplanted between iliofemoral artery and vein separately and took as bridge-style blood vessels of artery and vein shunt,and detected the blood flow.

目的 寻找适宜和较口径的自体移植血管方法在动物试验中，将犬的小隐或颈外静脉制作成单根和两端均裤式单开口的双血管桥，分别移植于髂-股动、静脉间和作为动、静脉转流的桥式血管，进行血流量的检测。

Automatic collision avoidance system from radar to identify vehicles with obstructions close to the moment, Majesta automatically tighten seat belts, brake at the same time alleviate the impact to effect automatic collision avoidance system, with the move towards headlights, dual front airbags and front Department knees airbag + side airbags, curtain airbags are standard equipment MAJESTA

自动避撞系统通过雷达识别车距，在与障碍物接近瞬间，Majesta可自动收紧安全带、同时进行制动以效缓解撞击自动避撞系统，随动转向头灯、前排正面双气囊及双膝部气囊+侧气囊、气帘等都是MAJESTA的标准配置

One is Bardina vorticity modification, and the other is Richardson number modification. Prediction results show that Bardina method has a superior capacity to Richardson number modification. Since DSM model has improved predictive results of the reversed velocity and tangential velocity, it is a potential method to predict strong swirling nonisotropic turbulent flow in stead of the longer convergence time.

本文采用了基于旋转体系使湍流脉动加强和削弱两种作用的修正方法对k-ε双方程的湍流耗散率方程进行修正，计算结果表明，从旋转体系可使湍流能量加强出发的Bardina涡量修正方法，预报回流区范围缩小，更加接近于试验值，其计算结果优于使湍流脉动削弱的Richardson修正。

The final step is the dissection of the internal thoracic artery and vein to avoid damage by compression, coiling, kinking, or stretching of the vascular pedicle.7 Usually, the internal thoracic artery and vein are exposed at the level of the first rib; branches are clipped next to the main branch while the other ends of the branches are either electrocauterized or clipped.

最后一步则是胸廓内动静脉的解剖，避免压迫、卷绕、纽绞或牵扯血管蒂。一般胸廓内动静脉可在第一肋水平显露；主支旁的分支可以结扎切断，其他分支可以双极电凝或结扎切断。

In chapter 2, based on analysis for the existed methods of torsional vibration measurement, a novel measuring method, parallelling dual-beam laser doppler torsional vibration measurement is first put forward by the author, it not only divides translation and rotation of the rotor, but also can be used to measure torsional vibration of non-cylinder rotor.

本文的第二章在分析现有扭转振动测量方法的基础上，首次提出平行双光束激光多普勒扭转振动测量方法，它不仅解决了转子平动与转动的完全分离，还能测量各种非圆形截面转子的扭转振动；为辨别转子的转动方向，还提出双频激光多普勒测振仪，满足故障诊断对测量启、停转子和转速方向变化转子性能的要求。

First, the angular velocity function and maneuver load for certain maneuver flight (including hover, dive-hike and these two combined) are set up. The simulation results of the vibration of double-disk rotor system with cantilever supported on rigid bearings show that rotor would be apparently deformed under maneuver load. Second, the performance of oil force of SFD in maneuver flight is analyzed. The results show that in maneuver flight, the SFD with centering spring will become eccentric and its oil force will be time-related and offset-related.

首先，建立了水平盘旋、俯冲拉起及盘旋+俯冲拉起复合机动三种机动飞行条件下的机动角速度函数，并确定了对应机动飞行条件下的机动附加载荷（附加离心力和附加陀螺力矩），分析了带刚支的双盘悬臂转子系统在机动飞行条件下的振动特性，发现发动机转子在机动飞行时会发生明显变形；随后，分析了非定心挤压油膜阻尼器的油膜力特性，机动飞行时，油膜轴颈在机动附加载荷的作用下偏离外环中心，使得带定心弹支的挤压油膜阻尼器也变成了非定心挤压油膜阻尼器，其非定心挤压油膜力是瞬态时变的，并且与SFD油膜轴颈偏移量和进动形态有关；然后，在经典的Jeffcott转子系统中引入带定心弹支的挤压油膜阻尼器，分析了机动飞行时非线性转子系统的振动特性，发现挤压油膜阻尼器油膜力的非协调特性也反映到转子系统的振动响应中；之后，对机动飞行条件下带挤压油膜阻尼器的双盘悬臂转子系统的振动特性进行了分析，并重点分析、总结了俯冲拉起机动飞行时，系统结构参数和工作状态参数（转速比、机动飞行半径、机动角速度等）对该系统振动特性的影响。

First, the angular velocity function and maneuver load for certain maneuver flight (including hover, dive-hike and these two combined) are set up. The simulation results of the vibration of double-disk rotor system with cantilever supported on rigid bearings show that rotor would be apparently deformed under maneuver load. Second, the performance of oil force of SFD in maneuver flight is analyzed. The results show that in maneuver flight, the SFD with centering spring will become eccentric and its oil force will be time-related and offset-related. Then, SFDs are introduced into typical Jeffcott rotor system. The whole system will be statically displaced in maneuver flight and the nonsynchronous components of oil force appear in the response of rotor system.

首先，建立了水平盘旋、俯冲拉起及盘旋+俯冲拉起复合机动三种机动飞行条件下的机动角速度函数，并确定了对应机动飞行条件下的机动附加载荷(附加离心力和附加陀螺力矩)，分析了带刚支的双盘悬臂转子系统在机动飞行条件下的振动特性，发现发动机转子在机动飞行时会发生明显变形；随后，分析了非定心挤压油膜阻尼器的油膜力特性，机动飞行时，油膜轴颈在机动附加载荷的作用下偏离外环中心，使得带定心弹支的挤压油膜阻尼器也变成了非定心挤压油膜阻尼器，其非定心挤压油膜力是瞬态时变的，并且与SFD油膜轴颈偏移量和进动形态有关；然后，在经典的Jeffcott转子系统中引入带定心弹支的挤压油膜阻尼器，分析了机动飞行时非线性转子系统的振动特性，发现挤压油膜阻尼器油膜力的非协调特性也反映到转子系统的振动响应中；之后，对机动飞行条件下带挤压油膜阻尼器的双盘悬臂转子系统的振动特性进行了分析，并重点分析、总结了俯冲拉起机动飞行时，系统结构参数和工作状态参数(转速比、机动飞行半径、机动角速度等)对该系统振动特性的影响。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。