查询词典 fractional

To remove from the numerator and denominator of a fractional expression.

约分：从一个分数表达式的分子和分母去掉

To removefrom the numerator and denominator of a fractional expression.

上式中分母的第二项可以略去。

Firstly, in the frequency domain, differentiatial operator is decomposed into magnitude and phase operator, and the fractional order expressions of periodical signals, such as sine wave, cosine wave and complex exponent signal, are deduced.

首先，在频域中将微分算子分解为幅度算子和相们算子，导出正弦、余弦和复指数信号的分数阶微分表达式；然后考察矩形、三角形、梯形等常用周期信号的分数阶微分。

No additional data for frequency tracking are need, but higher estimation accuracy and low computational complexity can be obtained. Finally, a kind of optimizing joint algorithm for symbol timing, frequency synchronization and channel estimation is proposed. The false alarm probability and miss detect probability of the symbol timing are derived. We proved that the time－frequency offset domain random sequence sliding in the frequency offset direction is orthogonal with the original random sequence, and proposed a new integer frequency offset estimation algorithm. The coarse estimation methods for fractional frequency offset both in AWGN and multipath channels are proposed too.

最后，提出了一种优化的符号同步、频偏估计和信道估计的联合算法，推导了符号同步方法的虚警概率和漏检概率，给出了随机序列在时间－频率偏移域沿频率偏移方向滑动后与原序列近似正交的证明，提出了一种新的在时间－频率偏移域沿频率偏移方向进行滑动相关估计整数频偏的方法，提出了在AWGN信道和多径信道下进行小数频偏粗估计的方法，给出了小数频偏细估计的ML估计结果和利用频域PN序列取值特性的简洁的信道估计结果。

In this paper,a technique to determine the geometrical properties of fractional Fourier transform of paraxial beams based on the phase space beam transformation matrix is presented.

提出一种分析傍轴光束分数傅里叶变换几何特性的相空间束矩阵变换的简单方法。

According to absorption, the fractional saturation versus the partial pressure of oxygen can be obtained by means of absorption kinetics.

根据吸附过程的特点，利用吸附动力学方法，得到了反映血红蛋白分子氧合过程的氧饱合分数与氧分压之间的关系式。

Based on the construction pattern and the control principle of stepmotor,fractional step angle control of stepmotor is achieved by PWM Phase Vector Cornposition.

本文根据步进电视的结构与控制原理，提出一种PWM式相矢量合成分数步距角控制方案。利用脉宽调制方式来实现各相平均电流。

Main finding is that the effect of water on structure and properties of the epoxy polymer is non-monotonic: on one hand, more water can lead to the plasticization of the polymeric network, that is, decreased density, increased fractional free volume, accelerated local chains; on the other hand, less water can lead to the contrast trends of the said above properties, that is, antiplasticization.

该模拟的主要发现是水对该聚合物网络的影响是非单调的：较多的水分可能导致聚合物网络的塑化，如系统的密度降低、自由体积分率增加、局部链运动加快；但是当吸收较少的水分时，这些性质可能得到一定的增强。

Always get the actual point size of a diamond rather than a fractional weight.

始终得到实际点大小的钻石，而不是一个小数的重量。

During the course of the experiment, the student will be exposed to fractional distillation under vacuum, gas chromatography, refractometry, polarimetry, and IR absorption spectroscopy.

气相色层分析，折光率的测定，旋光度的测定和红外吸收光谱。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。