查询词典 propagation

The experimental results show that in both the learning speed and correction of character recognition, the Levenberg-Marquardt Back-Propagation Neural Networks in recognition of the capital English characters and the Arabic numbers is the best approach.

从实验结果得知，无论是学习速率或字元判别的正确率，都是Levenberg-Marquardt倒传递类神经网路在辨识英数字元影像上为最佳。

Firstly it describes the development ,basic principle and application and propagation characteristic of mobile channel , then investigates the system structure of DAB transmitter and receiver separately and the key technology of realization of the digital audio broadcast system.And then discusses the system component of FFT －the demodulation module of OFDM .The 409- points FFT module employs a radix-4 decimation-in-frequency algorithm, includes arithmetic element , read and write address element ,twiddle factor element and control element , is realized by FPGA. In the end , the result is verified in the matlab .

首先概述了OFDM的发展、基本原理和应用以及移动信道的传播特性，接着分别研究了数字音频广播接收机和发射机的系统结构，以及数字音频广播系统实现的关键技术，然后详细论述了OFDM解调模块FFT的系统结构，主要研究了4096点FFT采用基－4按频率抽取实现的算法，整个FFT模块包括了运算单元、读写地址单元、旋转因子单元以及控制单元，并且在FPGA中进行了硬件实现，并在matlab环境下对结果进行了验证。

In Black-Scholes pricing model, there was five variables impact the option price that we take to be the input variable in artificial neural network, both Back-Propagation Network and Radial Basis Function Network are used. Base on the difference analysis, we find out another variable that can improve learning efficiency and affectivity.

为避免差异，以Black-Scholes模式中，五项影响权证价格之因子为输入变数，分别以倒传递网路与半径式函数网路建立模式，並藉差异分析找出可改善学习绩效之变数。

Sheep, monkeys and cows and other animals can not be conducted without manual asexual propagation.

绵羊、猴子和牛等动物没有人工操作是不能进行无性繁殖的。

The external cause includes unfitting culture conditions, strain aging, unsuitable preservation and infection virus of asexuality propagation.

针对遗传变异和环境条件引起的菌种性能衰退，提出了有效的预防措施及具有可操作性的菌种复壮技术。

The internal cause includes polarity variation , inbred variation , instability of hybridization and gene mutation . The external cause includes unfitting culture conditions , strain ag ing , unsuitable preservation and infection virus of asexuality propagation .

内因主要包括极性发生变异，自交产生的变异，杂交种性不稳定和基因突变；外因主要包括培养条件不适宜，菌种老化，菌种保藏不当和菌株无性繁殖体感染病毒。

A trial was conducted to examine the effects of five different areas on Asiatic lily bulb propagation in Qinling-Moutain.

在秦岭的五个地区，对亚洲百合种球繁育表现进行了试验比较研究。

Based on the propagation law of partially coherent light, the spectral changes of Gaussian Schell-model beams passing through an astigmatic aperture lens are studied.

从部分相干光的传输理论出发，研究了高斯-谢尔模型光束通过光阑像散透镜传输轴上的光谱变化规律。

From the lumped equivalent circuit model, the phase shift/attenuation and impedance characteristics of the novel structure are first analysed based on the Bloch theory, which shows the novel structure has properties analogous to those of a bandpass filter: the attenuation constant keeps zero with a continuous and smooth characteristic impedance distribution within the passband and the bandwidth may be arbitrarily specified; characteristic impedance is purely imaginary with the inhibition of the electromagetic wave propagation outside the passband.

首先从一般的等效电路模型出发，根据Bloch周期性理论对该结构的相移、衰减和阻抗特性进行了分析，结果表明该新结构具有类似带通滤波器的特性：通带内衰减常数为零，特性阻抗为实数并随频率连续平滑分布，具有可任意指定的阻抗匹配带宽；带外特性阻抗为纯虚数，电磁波传播受到抑制。

Multiple Attribute Decision Making ; Interval ; Entropy ; Attribute Weight ; Error Propagation

多属性决策；区间数；熵；属性权重；误差传递

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失