1)  second-order NLO coefficient
二阶NLO
2)  second-order nonlinear optical properties
二阶NLO性质
3)  Second-order NLO coefficient
二阶NLO系数
4)  second order
二阶
1.
The existence of periodic solutions for a class of second order functional differential equations;
一类二阶泛函微分方程周期解的存在性
2.
Interval oscillation for second order neutral functional differential equations;
一类二阶中立型泛函微分方程的区间振动性
3.
Oscillation comparison theorems of solutions for second order nonlinear elliptic differential equations;
二阶非线性椭圆型微分方程解的振动比较定理
5)  second-order
二阶
1.
Oscillation criteria for a kind of second-order nonlinear difference equation;
一类二阶非线性差分方程的振动准则
2.
Boundedness of second-order nonlinear functional differential equations;
关于二阶非线性泛函微分方程的有界性
3.
A Second-order Algorithm for the Numerical S imulation of Stochastic Resonance;
一种用于随机共振数值模拟的二阶方法
6)  two-stage sampling
二阶抽样
1.
Extension of two useful results in two-stage sampling and its applications;
对二阶抽样中两个定理的扩充及其应用
2.
Based on the calculations in simple random sampling,stratified random sampling and two-stage sampling,it is shown that when the sampling size of two-stage sampling is 1/2 that of simple random sampling,the mean square error is much smaller than that of simple random sampling.
在通过对简单随机抽样、分层随机抽样和二阶抽样的实例计算之后,证明二阶抽样在抽样样本量为简单随机抽样的1/2时,其样本方差远小于简单随机抽样的样本方差;在样本量与分层随机抽样相同的情况下,其样本方差也要远小于分层随机抽样方差,提高了抽样数据的可信度和精度,从而肯定了二阶抽样方法对于数控机床可靠性研究中数据抽样问题的适用性,节约了抽样成本。
3.
Based on the precision and the cost of the relationship between the use of conditional extremum for the function of several variables method to determine when the first sample for sampling with probability proportion to size,the second-simple random sampling,the two-stage sampling is optimal allocation.
本文根据精度与费用之间的关系,利用求多元函数条件极值的方法,确定当第一级抽样为有放回PPS抽样,第二级抽样为简单随机抽样时,二阶抽样的样本容量最优分配。
参考词条
补充资料：二氧化双环戊二烯B阶树脂模塑料
分子式：
CAS号：

性质：又称二氧化双环戊二烯B阶树脂模塑料。以二氧化双环戊二烯B阶树脂为基料配制的能采用模塑方法成型的配混料。产品性能为：弯曲强度110MPa，冲击强度5.4kJ/m2；马丁耐热240℃；体积电阻率1.3×1016Ω·cm，介电强度24.5MV/m。由二氧化双环戊二烯B阶树脂，用石英粉等作填料，再加脱模剂配混制得。可用模塑法制成耐热、耐候制品用于军工和民用方面。

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