逼近

Firstly, the Signal Noise Ratio characteristic of matched filter despread symbol and the distribution of coherent phase estimation error are derived. Secondly, the exact integration formula of BER for fading channel is presented, moreover, by using the Maclaurin series expansion of MPSK conditional Symbol Error Rate, the simplified BER approximations for BPSK and QPSK are derived over AWGN, Nakagami-m fading and Rayleigh fading channel.

首先推导了匹配滤波解扩符号的信噪比特性和相干相位估计误差的分布；然后给出了衰落信道中误比特率的精确积分式，并利用MPSK条件误符号率的麦克劳林级数形式，推导了AWGN，Nakagami-m衰落和瑞利衰落信道中BPSK，QPSK误比特率的简化逼近式。

The paper introduces an algorithm to natural logarithm based on Maclaurin series.

基于麦克劳林级数公式计算自然对数，构造计算式向1逼近，从而加快级数的收敛速度。

But it is strongly nonlinear for vortex, hysteresis and magnetic saturation, so can hardly be identified by traditional identification model.

但是其存在涡流、磁滞和磁饱和等现象，机理复杂而且具有强非线性，用传统的系统辨识模型无法在较大的范围之内精确地逼近实际系统。

As the thick of winter draws nigh, many Sichuan people, who now live in the make-shift temporary housing, can expect a harsher time, compared to the previous winters.

随著寒冬逼近，不少居於临时房屋的四川居民将要面对更艰苦的生活，情况较以往的冬天难熬。

Proposed in the p aper are the ordered monotony property of MFNNs when the transfer function is mo notone, the continuous mapping theorem, and non-approximation theorem to functi on.

给出了单调传递函数的MFNNs按序单调特性、连续映射定理以及非函数一致逼近定理。

CNC machine only to the general linear and circular interpolation, and other curves (such as becoming more open lines) with mathematical method linear and circular approximation, linear and circular interpolation can be special machine outside the curve.

一般数控机床仅对圆弧和直线插补，其它曲线用数学方法，采用直线和圆弧逼近，特殊机床可插补直线和圆弧外的曲线。

In generic mathematical approximation methods Chebyshev multinomial approximation algorithm has better effect on reducing approximation error. This paper brought forward a parallel Chebyshev multinomial approximation algorithm based on a unique representation of complex curve, and implemented the parallel program in two Java methods.

常用的数学逼近法中切比雪夫多项式拟和法误差较小，对此，提出一种基於复杂曲线表示的切比雪夫多项式拟合并行算法，并采用两种Java方案实现并行程序。

According to the robust control H2 optimal performance specification, the practically desired diagonal elements of the system transfer matrix are suggested, and in view of the coupling action existing between the two closed loops, dynamic detuning factors are introduced to design the optimal double-loop controllers, and their executable PI/PID forms are derived using a mathematical rational approximation approach.

根据鲁棒控制H2最优性能指标，提出实际期望实现的系统传函矩阵中的对角元。考虑到两个闭环之间的耦合作用，引入动态解调因子设计最优双回路控制器，采用数学有理逼近的方法得到其实际可执行的PI/PID形式。

In this paper, a class of matrix equation AXB = C is discussed.

中文摘要：本文针对一类一般意义下的矩阵方程，即AXB=C，应用矩阵分块的技巧，并结合特定矩阵的结构特征，采用合适的分解方法，给出了它有双对称，双反对称解的充要条件以及在条件满足时的通解表达式，并给出了各自在不同情况下的最佳逼近解。

A new method for consistency adjustment of fuzzy preference relations matrix in Group Decision is proposed.

针对模糊偏好关系矩阵本身是否一致，使得原矩阵渐进逼近目标矩阵的问题，提出了群决策中模糊偏好关系矩阵一致性调整的新方法。

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。