查询词典 approximate differential

The bifurcation and chaos behavior of impact and rubbing fault rotor system caused by the parameters of nonlinear rigidity, rotor rotating speed, eccentric mass is analyzed, in the numerical value analysis method. The bifurcation diagrams, maximum Lyapunov exponent diagrams, Poincaré maps, phase plane portraits, trajectories of journal center, time-history curve, amplitude spectra diagrams of the rotor motion are used. The convert and evolution course of periodical response, quasi-periodical response, double-periodical bifurcation, chaos of the system response is analyzed.(3). It is deduced that the general differential equation of bending-torsional-pendular coupling vibration about rotor with the gyroscopic moment. On the basis of this equation, the general differential equations of coupled bending, torsional and pendular nonlinear vibration about rotor with unbalance character and rubbing character are deduced.

2建立了具有非线性刚度的转子系统在非稳态非线性油膜力作用下的径向碰摩动力学微分方程，并应用含高阶余项的非线性动力方程的线性化数值法研究了此类系统响应的复杂动力学行为，利用转子响应的分岔图、最大Lyapunov指数曲线、Poincaré截面映射、时域波形、相轨线、轴心轨迹、幅值谱等图形分析了系统响应的周期运动、拟周期运动、倍周期分岔、混沌等运动形式的转化与演变过程，重点研究了非线性刚度、转子转速、偏心质量等系统参数对碰摩故障转子系统的分岔和混沌行为的影响。

To investigate the dynamic stability of a two-degree-of-freedom manipulator as a system,differential equations of motion for this system were established on the basis of the Lagrange equation,and perturbed differential equations with period coefficients were derived for the period motion of this system by applying the perturbance theory.

为了研究两自由度机械手系统的动力学稳定性，基于拉格朗日方程给出了它的运动微分方程，并用扰动理论确定系统周期运动具有周期系数的扰动微分方程；根据F loquet理论对该系统扰动微分方程的平衡点的稳定性进行了分析，并用数值方法研究了平衡点失稳后的倍周期分岔过程。

Gene differential expression of rice under photoinhibition was studied by means of mRNA differential display.

本文应用mRNA差异显示技术研究水稻光抑制条件下的基因差异表达，筛选并克隆了3个差异表达片段，编号为Z8、Z9和Z10。

The fracture reasons of high strength PC steel wire are analyzed, it's considered that center segregation, central cavitation, poriness and inclusion are the metallurgical reasons which lead to the facture of PC steel wire and in the rolling process, differential coping quality, microcrack caused by surface defect, abnormal microstructure caused by burnt and improper cooling velocity, the ears on the head of the wire, overlapping of the wire rod itself are the main reasons which lead to the facture of PC steel wire. At the same time, inappropriate pickling, differential phosphorization quality, the bad heat treatment quality, the generation of crack in the improper drawing and transverse crack caused by abnormal laying of the drawing die are also the reasons of the cracking of PC wire.

对高强度PC钢丝断裂原因进行了分析，认为连铸坯的中心偏析、中心缩孔、疏松和夹杂是导致PC钢丝断裂的冶金原因；轧制过程中，较差的修磨质量、表面缺陷导致的微裂纹，过烧以及不适当的冷却速度导致的非正常显微组织，盘条头部的耳子、盘条本身折叠是导致PC钢丝断裂的主要原因；同时，不恰当的酸洗、较差的磷化及热处理质量、不适当拉丝裂纹的产生、拉拔模具安放不正导致的横裂也是PC钢丝断裂的原因。

The Jacobi pseudospectral methods are applied to numericalsolutions of singular differential equations,differential equations in infinite intervals andin disc.

事实上，通过适当的变量代换，我们可把无界区域问题转化成某些特定的退化系数的有界区域上的奇异问题。

Letting the commonly used double-staged 2K-H typed differential mechanism be combined with the overrunning clutch this method achieved the operation without differential while the settlings were on sedimentation .

这种方法将常用双级2K-H型差速器与超越离合器结合在一起，在沉积物沉降时实现无差速运行，从而避免了相对运动所带来的不良效果。

Letting the commonly used double-staged 2K-H typed differential mechanism be combined with the overrunning clutch this method achieved the operation without differential while the settlings were on sedimentation.

E书简介：摘要：传统卧式螺旋离心机在物料沉降分离时，对转鼓与螺旋输料器的相对运动所产生的搅动现象，提出一种差速传动机构改进方法。

Letting the commonly used double-staged 2K-H typed differential mechanism be combined with the overrunning clutch this method achieved the operation without differential while the settlings were on sedimentation.

传统卧式螺旋离心机在物料沉降分离时，对转鼓与螺旋输料器的相对运动所产生的搅动现象，提出一种差速传动机构改进方法。

The determination of IL-6 level of serum and urine may be used as one of the important indexes for differential diagnosis of acute rejection from CsA toxicosis and ATN.The determination of IL-6 level of serum and urine may also be useful for differential diagnosis of acute rejection from infection.

血、尿IL-6水平的升高可作为判断肾移植急性排斥的指标之一；也可作为鉴别急性排斥反应与CsA中毒、ATN的重要参考指标；对鉴别急性排斥反应和感染具一定的参考价值。

And the differential of the undurable consume products is higher than that of the durable comsume products; The differential of products in investment is higher than in intermediate industry.

所以，企业在实施差异化战略时，必须对消费者、竞争对手以及产品现状等产业环境进行分析，以便作出正确的战略决策。

Anna: No, I've got a hangover.

不是，我昨晚宿醉了。

We head into the mountains in Su's new Land Cruiser, stop for lunch at a scenic restaurant and then hang around drinking beer and eating fruit as two of his employees attempt to lure the birds with a tape recording of the fowl's mating call.

我们坐上苏的巡逻车向山顶出发，在一家风景优美的餐馆吃了中饭。然后我们喝着啤酒吃着水果四处逛。