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In whirling machining process,the hand-over-line of workpiece and tool face isn's an ideal spiral noodles wrap line because of the geometry error,heat change error and rigid varity.

旋风铣削加工中，工艺系统的几何误差、热变误差和刚性变化使工件与工具表面交线不是理想的螺旋面包络线，其位置也产生了偏差，影响到加工工件质量。

And the reasonable proposal for the construction the region electrical power system was put forwardThe power load forecast is the basis of the power system planning.With the actual planning of regional development,uses a scientific and effective load forecasting methods forecast plans the local load electric quantity,is an important work to the regional power system planning.This dissertation uses the BP algorithm, proposed a double hidden layer structure artificial neural network to the forecast ultra-short-term power system load.After the simulation with the actual data,the method which this dissertation proposed compared to the traditional linear extrapolation Prediction method average absolute percent error of 2.5 percentage points,ten minute load forecasts achieve the average absolute percentage error are smaller than 2.5%accuracy.

本文利用人工神经网络BP算法，提出了一种双隐层结构的电力系统超短期负荷预测方法，经过对实际数据的仿真实验，本文提出的神经网络超短期负荷预测方法比传统的线性外推法预测平均绝对百分误差降低2.5个百分点，十分钟负荷预测达到平均绝对百分误差小于2.5%的精度。

In this paper, we investigate the error performance lower bound of the minimum-mean-square-error V-BLAST receiver.

在这篇论文里，我们主要针对一个使用最小均方误差演算法的V-BLAST接收机进行错误效能上的研究。

One is the error on the direction in the length of the loxodrome,and the other is the error on the height direction. Both of them are analyzed in this paper.

当用片铣刀进行铣槽加工时，由于是用直线段包络斜航线，存在刀具干涉问题；刀具干涉会引起螺旋槽长度方向和高度方向上的两种误差。

The factors that influence contour accuracy of the machine are analyzed. The equation ofcontour error due to feeding axis's dynamics is derived by circular contour motion of themachine, and a model of contour error is proposed.

五、研究了引起轮廓误差的各种因素，以圆弧轮廓为例推导了联动坐标轴动态特性对轮廓误差的影响公式，提出了轮廓误差模型。

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。

Exit Sub Errhandler:' If an error occurs, display a message and end the macro. MsgBox "An error has occurred. The macro will end." End Sub

这个的下一个范例类似於巨集范例 1 ＞中；不过，此巨集实作 Error 陈述式和使用 Err 函数来当发生错误时，请显示更具描述性的错误讯息。

The minimum error was 0.275 864 percent and maximum error was 4.820 747 percent.

模型回归的平均相对误差最小为0.275 864%，最大为

Based on the normalized mean square error,an instrumental variable is derived for yielding a variable clipping function to provide fast convergence and small mean square error.

基于归一化的均方误差，引入了一个辅助变量，导出了时变限幅函数，加速了收敛并且得到了更小的均方误差。

Four sub-channels are used in the forward equalizer and the coefficients of the equalizer are adjusted by the error of constant modulus algorithm. The advantages of FSE and DFE are integrated. The ideal equalization can be obtained as long as the length of the equalizer equal to or bigger than that of the channel, and the algorithm has the characteristics of faster convergence and smaller mean square error.

该算法前馈滤波器采用4路子信道系统模型，用常数模误差函数对均衡器权系数进行调整，综合了分数间隔均衡器和判决反馈均衡器的优点，均衡器权长只要大于或等于信道长度就能完全均衡信道，该算法收敛速度比波特间隔判决反馈盲均衡算法与T/4分数间隔盲均衡算法(T/4FSE)快、均方误差比BSDFE与T/4FSE小，且计算量不变，有利于信息的实时恢复。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。