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Compared with other fixed control channel based protocol, it significantly reduces the probability of collision and congestion, thereby improves the end-to-end delay and network throughput.

与其它基于固定控制信道的MAC协议相比，大大降低了发生冲突和拥塞的概率，进而降低了端到端时延并提供了较好的端到端吞吐性能。

By theory and experiments,the etching behaviors of joint channel with different width ratios are compared.

金仲和 浙江大学信息与电子工程系，杭州 310027王跃林浙江大学信息与电子工程系，杭州 310027

We stand in awe of the centuried Redwoods of the Pacific coast and the twisted, giant Saguaros of the high desert, but compared to the Chaparral bush they are mere infants.

通常，一提起太平洋沿岸的古老的红杉和沙漠中扭曲高大的仙人掌人们往往会产生敬畏的感觉。然而与矮橡树灌木林相比，这些都是微不足道的。

Tumefaciens mediated transformation using cotyledonary node as explants was optimized; 3 methods including cutting chapiter, ovary injection and chapiter spreading for pollen tube pathway was compared. Cutting chapiter and ovary injection can both achieve insect resistant gene tranformants.

优化了以子叶节为外植体的农杆菌介导转化技术；比较了切割柱头、子房注射和子房涂抹3种花粉管通道法处理授粉后黄瓜子房的转化效果，切割柱头和子房注射均可成功获得黄瓜抗虫转基因植株。

Several different measure methods were adopted to measure and character the ZnO powder particle size and the results were analyzed and compared in this paper.

以 ZnO粉末作为粒度分析对象，对几种不同方法测试结果进行了比较、分析。

Based on the research results of Chaos theory, in this dissertation, it has made detailed analysis of the chaotic signal generator. Firstly, the characteristic and various detection methods of chaotic signal are recommended. Secondly, with the aid of software, such as MATLAB, PSPICE, EWB, etc, discussion of the process of generating chaotic signal proceeds. Through simulation, the output result of several kinds of chaotic circuit are analyzed and compared. Thirdly, aiming at Chuas chaotic circuit, through debugging, the impacts by components and parts in the circuit, such as operation amplifier, capacity, inductor, etc, has been further investigated. And then provides a new scheme to implement Lorenz chaotic system, the circuit design and analysis are presented in detail and it can be realized by the hardware of programmable arrays FPGA, the experimental results indicate that this scheme has the advantages of easy operation, flexible design and high efficiency. An application example in secure communications is also provided. Finally, through picking up the characteristic parameter-Lyapunov exponent of the Chaos we can analyze the performance of different chaotic signal generators.

本文在混沌理论研究成果的基础上，对混沌信号的产生做了详细的分析，涵盖以下内容：首先介绍了混沌的定义，混沌信号的基本特性和各种判别方法，特别是对简单的一维Logistic映射的硬件实现问题做了初步探索；其次对混沌信号的产生方法进行讨论，借助于MATLAB、PSPICE、EWB等仿真软件，对几种混沌电路输出的混沌信号进行了分析比较，并在此基础上针对典型三阶连续自治系统Chua's电路作进一步实验研究，通过混沌电路调试，深入研究电路中各元器件，特别是运算放大器、电容、电感等对混沌信号时域以及频谱的影响；再次研究连续混沌系统的数字化硬件产生，设计了Lorenz混沌电路在现场可编程门阵列FPGA上实现的新方案，在保密通信中的应用实验结果表明该方案具有操作简单、设计灵活、效率高等优点；最后针对不同混沌系统，采取不同算法，提取混沌特性参数Lyapunov指数，进而对不同的混沌信号发生器的性能进行了分析。

The calculated results of the discrete model accord with the experimental data well. Compared with a simple continual model, the discrete model is true of the characteristic of the flow in manifold systems, and it also shows the availability of the way to use BP neural networks to measure the key coefficient of the discrete model.

通过离散模型计算得出的结果与实验数据符合良好，说明与简化的连续模型相比，离散模型是一种更为符合并联管组流动特性的理论模型，同时也表明了用BP算法来确定离散模型关键系数的有效性。

In the paper recognition accurate are compared according to different speech characteristic parameters and the state numbers of Hidden Markov Model.

论文比较了不同语音特征参数以及隐含马尔可夫模型状态数对电话语音识别精度的影响。

Compared to debit cards issued by domestic banks, those issued by foreign capital banks will charge a certain overhead charge at those accounts which don't have enough money in it, which is so called like "a high threshold".

相对于国内银行的借记卡来说，外资银行卡最大的特点就是对余额没有满足条件的账户收取一定的管理费，也就是人们常说的"准入门槛高"。

The results showed that (1) Surface charge density of apoptotic cell of electret group was significantly reduced as compared with those of control group.

结果显示：（1）负极性驻极体作用3T3细胞能减少凋亡细胞的表面电荷密度。

He paid $5,000 for this cupcake.

他我这个纸杯蛋糕花了5000美元。

I mean, if you want to, that is

我的意思是，如果你们想吃的话。