从理论上讲，通过坐标轴旋转将二次方程化简为规范形式，从而讨论其曲线的形状，这已是讨论得相当明了的课题。
Theoretically speaking, it is a rather-clearly discussed subject to standardize the quadratic equation into the normal forms by spinning the coordinate axis so as to approach the shapes of its curves.
本文分析了普通十字轴万向节内二次力矩产生的原因。
In this paper, why the second couple in the ring-fork U-joint occurs is analyzed.
为了成形大断面收缩率轴类零件，进行了楔横轧二次楔入试验。
For the sake of the axis accessory's figuration, the experiment of second wedge heavy section shrinkage was carried out.
结果表明：随着双线性耦合场或双二次耦合场的增加，交换偏置场的最大值位置向易轴靠近。
The results show that the maximum of the exchange bias field departs from easy axis with increasing the biquadratic-coupling field or bilinear field.
采用二次形函数薄层单元和傍轴边界分别模拟弹性半空间上的层状场地和半空间。
Layered soils and elastic half-space were simulated by thin layer elements with quadratic shape function and paraxial boundary respectively.
发现真实结构燃烧室内的回流区不再是轴对称，主燃孔和二次气流的存在使回流区明显被压扁（最扁处的长轴约为短轴的1.6倍）；
The presence of primary hole air flows remarkably squeezes the recirculation zone, resulting in a elliptic-like cross section, with the long axis is longer than the short one up to 1.6 times.
在普通十字轴万向节二次力矩的基础上，推导出环叉式万向节二次力短的瞬时表达式。
On the base of the second couple of the common cross U-jioint. a transient value of the second couple in the ring-fork U-joint is obtained.
研究了花岗岩板在单轴压缩应力状态下的微观破坏过程。试验主要采用了液压加载台、光学显微镜、同步录象系统以及二次复型技术等。
Progressive cracking of granite plate under uniaxial compression had been investigated by using a loading frame, which could be well equipped with optical microscope and video recorder.
作为实例，讨论了二次效应对不同转速铜圆轴中应力的影响。
As a practical example, the influence of the second-order effects on the stresses in the copper shaft is discussed.
首次建立了双连拱隧道二次衬砌内力（轴力和弯矩）模型及围岩的稳定与变形的规律。
The model of internal force for the secondary lining and the laws of the deformation and the stability for the surrounding rock have been set up firstly in the double-arch tunnel.
利用二次曝光全息干涉术实现了对单轴式声悬浮声压场的研究。
By using double -exposed holographic interferometry, the distribution of sound pressure in the...
为了成形大断面收缩率轴类零件，进行了楔横轧二次楔入试验。
Experimental study on limit-section shrinkage of one wedge in cross wedge rolling;
为了成形大断面收缩率轴类零件，进行了楔横轧二次楔入试验。
Experimental study on limit-section shrinkage of one wedge in cross wedge rolling;
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