1) nonoscillation criterion
非振动准则
1.
A nonoscillation criterion for the second order nonlinear neutral delay differential equation with both positive and negative coefficients of the form d 2dt 2h[x(t)+px(t-τ)]+Q 1(t)f(x(σ 1(t)))-Q 2(t)g(x(σ 2(t)))=0 are established.
建立了一类具有正负系数的非线性二阶中立型时滞微分方程 :d2dt2 h[x(t) +px(t-τ) ]+Q1(t) f (x(σ1(t) ) ) - Q2 (t) g(x(σ2 (t) ) ) =0的非振动准则 ,推广和改进了 Kulenovi′c M。
2) oscillation criterion
振动准则
1.
In this paper a new oscillation criterion for second order nonlinear differential equations was established.
本文给出了二阶非线性微分方程的一个新的振动准则。
3) oscillation criteria
振动准则
1.
In this paper some oscillation criteria are established for solutions of a class of neutral hyperbolic boundary value problems.
本文建立一类中立型双曲方程边值问题解的振动准则。
2.
In this paper some oscillation criteria are established for solutions of boundary value problems of a class of partial differential equations with deviating arguments.
本文建立了一类带偏差变元的偏微分方程边值问题解的振动准则。
4) non-quasi-oscillation
非准振动
5) interval oscillation criteria
区间振动准则
1.
By using averaging functions and a generalized Riccati transformation, new interval oscillation criteria for the differential equations are established, which are different from the most known ones in the sense that they are based on the information only on a sequence of subintervals of [t0,∞), rather than on the whole half-line.
本文研究一类具有阻尼项的二阶非线性微分方程,利用平均函数和一个广义Riccati变换,得到了该方程的新的区间振动准则,这些准则不同于已知的依赖于整个区间[t0,∞)的性质的结果,而是仅依赖于区间[t0,∞)的子区间列的性质。
2.
By using the Riccati technique and the variational principle,new interval oscillation criteria are established for forced second-order nonlinear differential equations with damping.
利用Riccati技巧和变分原理,对带阻尼项的二阶强迫非线性微分方程建立了新的区间振动准则,推广和改进了已有的一些结果。
6) non-associated flow rules
非关联流动准则
1.
The non-linear Mohr-Coulomb failure criterion,the equilibrium principle,and the large and small strain theories are employed for the plastic zone,and analytical solutions of the stress,strain,and displacement fields for cavity expansion are presented with the non-associated flow rules for the shear dilatation characteristics.
将圆孔周围的围岩分为弹性和塑性应力区,考虑土体受力后的剪胀特性,根据Mohr-Coulomb非线性强度准则、应力平衡条件、大小变形理论和非关联流动准则,推导出排水情况下土体发生大、小变形时扩孔问题的塑性区应力、应变和位移场解析,并给出大、小变形情况下塑性区半径和极限扩孔压力的非线性解答。
补充资料：点振子振动和点电极振子振动
分子式：
CAS号：
性质：又称点振子振动和点电极振子振动。振动能量绝大部分集中在点电极范围内，形成“能量封闭”的振动模式。振子电极面远小于压电陶瓷片的总面积，且与厚度有适宜的匹配关系。在交变电场作用下，沿厚度方向产生振动，其振幅随着至电极中心距离的增加，呈指数式衰减。谐振频率与压电陶瓷片的厚度有关。为提高频率通常将压电陶瓷片磨得很薄，有时考虑到压电陶瓷自身强度太低，可用特制的陶瓷片作垫片来防止压电陶瓷片损坏。常用于高频场合。
CAS号：
性质：又称点振子振动和点电极振子振动。振动能量绝大部分集中在点电极范围内，形成“能量封闭”的振动模式。振子电极面远小于压电陶瓷片的总面积，且与厚度有适宜的匹配关系。在交变电场作用下，沿厚度方向产生振动，其振幅随着至电极中心距离的增加，呈指数式衰减。谐振频率与压电陶瓷片的厚度有关。为提高频率通常将压电陶瓷片磨得很薄，有时考虑到压电陶瓷自身强度太低，可用特制的陶瓷片作垫片来防止压电陶瓷片损坏。常用于高频场合。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条