一阶

Propagation properties of high-order Bessel-Gaussian beam through a misaligned first-order ABCD system have been studied by using the generalized Huygens-Fresnel diffraction integral and augmented matrix .

使用广义惠更斯-菲涅耳衍射积分和增广矩阵，研究了Bessel-Gaussian光束通过失调一阶ABCD系统的传输特性。

Four characteristic parameters, mean value, variation coefficient, skewnesscoefficient and first-order autocorrelation coefficient, of these precipitation series areestimated with classical statistics.

利用经典统计学理论计算了研究区域上样本站和检验站的年降水序列的特征参数——均值、变差系数、偏态系数和一阶自相关系数。

Usually the sensor colored noise is modeled as an AutoregRessive process.

摘要传感器量测噪声通常可表示为一阶时间相关的Markov随机序列。

Simple upper bounds of signal to noise ratio improvement factor are derived for the suppression of a narrowband first-order autoregressive process and analytical conclusions corroborated by numerical examples.

研究了判决反馈滤波器在直扩系统中估计和抑制窄带干扰的性能，给出了判决反馈滤波器抑制一阶自回归干扰时信噪比提高因子的闭合表达式的上界。

For simplicity, a one-dimensional autoregressive process is used to model the time-varying channel, and the least square algorithm based on pilot signals is adopted to track the time-varying channel fading factor a.

为了简化计算，采用一阶自回归过程对时变信道进行建模。

He has taught the following courses since he became a teacher in 2001: first-order logic, modal logic, the axiomatic set theory, recursive theory and model theory.

已开课程有《一阶逻辑》《模态逻辑》《公理集合论》《递归论》《模型论》。2005年11月至2006年11月，访学于阿姆斯特丹大学逻辑、语言与计算研究所。

The independence of Axiomatic system in essence means that if we delete any axiom or inference rule, then the set of theorem would be changed.

一阶谓词系统的独立性问题的实质是说：如果删除掉某条公理或推理规则，那么定理集将发生变化。

To verify the properties of the concurrent and reactive systems based on the theorem proving approach, an axiomatization is formulized for the first order projection temporal logic.

为了采用定理证明的方法对并发及交互式系统进行验证，提出了一阶投影时序逻辑的公理系统。

Regarding small convergence interval of conical degree as machinery sealed ring basic principle of structure optimization,with the maximum contact pressure as goal function,with the wear allowance of float ring as designing variable,the first order optimization method was applied to carry on thermal-structural coupling finite element optimization analysis of machinery sealed ring.

以小锥度的收敛间隙为优化原则，以最大接触压力作为目标函数，以静环端面的磨损裕度为设计变量，采用一阶优化法进行机械密封环热-结构耦合有限元优化计算。

The best estimator selection was also discussed. The results show that the correlation obtained by the equation established from FD is the best, and the lg (1/R) spectra can improve the retrieval of chlorophyll contents with remote sensing.

结果表明，叶绿素含量与反射率一阶微分光谱方程的相关性最强，而采用lg(1/R)的光谱形式能够提高遥感反演叶绿素含量的效果。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。