数字HDTV发射管的发展及其应用

本文主要论述了英国ＥＥＶ，美国Ｖａｒｉａｎ和法国ＴｈｏｍｓｏｎＴｕｂｅｓＥｌｅｃｔｒｏｎｉｑｕｅｓ三家公司推出的数字ＨＤＴＶ发射管ＩＯＴ（ＩｎｄｕｃｔｉｖｅＯｕｔｐｕｔＴｕｂｅ）以及ＴｈｏｍｓｏｎＴｕｂｅｓＥｌｅｃｔｒｏｎｉｑｕｅｓ新近推向市场的ＨＤＴＶ发射管ＴＨ５６３四极管和双端四极管（Ｄｉａｃｒｏｄｅ—Ｄｏｕｂｌｅ－ｅｎｄｅｄｔｅｔｒｏｄｅ）ＴＨ６８０所达到的技术水平；特别着重介绍了上述三种数字ＨＤＴＶ发射管的整机应用情况，同时也展望了ＩＯＴ，尤其是ＴＨ５６３和ＴＨ６８０的美好应用前景。     

一种基于异常值检测和群体智能优化神经网络的电价混合预测模型

为了提高短期电价预测精度,本文提出了一种将异常值检测、时间序列分析、神经网络以及群体智能算法相结合的混合算法。作为混合算法的具体实现,文中的异常值检测利用了残差比方法和正态分布方法,群体智能优化算法选取了粒子群(PSO)算法和布谷鸟(CS)算法。作为实例研究,本文将混合模型应用用于澳大利亚新南威尔士州短期电价预测中,结果表明,混合预测方法能在一定程度上提高模型的预测精度。     

A 4th order fully integrated active RC complex filter with novel automatic tuning systems

This letter introduces a 4th order active RC complex filter with 1.5MHz center frequency and 1MHz bandwidth. The total harmonic distortion of the filter is less than –60dB and the image rejection ratio is greater than 60dB. A novel technique is also proposed in this letter to automatically adjust the variation of the time constant. The advantages of the proposed method are its high precision and simplicity. Using 5bits control words, the tuning error is less than ±1.6%.     

Implementation of secure digital communication by hyperchaoticsynchronisation

By active-passive-decomposition synchronisation, the application of the one-way coupled ring map lattice hyperchaotic system in secure digital speech communication is demonstrated. Synchronisation guarantees strong security and recovery without error     

几何位相非线性变化的实验研究

本文报道了Pancharatnam位相非线性变化的实验研究，实验结果与理论预言符合得很好。Pancharatnam位相的这种非线性可能在光开关中得到应用。     

雷达电站的模块化设计

从模块化的基本概念出发，结合雷达电站分系统设计的情况，探讨了雷达电站模块化设计的可行性和设计方法。     

语音编码综述

语音编码技术经历了半个多世纪，其编码速率已从64kb／s压缩到skb／s，并向更低速率进展。本文将回顾这一历程，并探讨今后语音编码的研究方向。     

快速汉克尔变换及光束均匀化

介绍快速汉克尔变换，以及它在二元光学设计中的应用，并就光束均匀化问题进行了数值模拟，结果表明快速汉克尔变换算法是一种能用于二元光学设计的有效算法。     

SO2 emission characteristics and BP neural networks prediction in MSW/coal co-fired fluidized beds

The SO₂ emission characteristics of typical MSW components and their mixtures have been investigated in a Φ150mm fluidized bed. Some influencing factors of SO₂ emission in MSW fluidized bed incinerator were found out in this study. The SO₂ emission is increasing with the growth of the bed temperature, and it is rising with the increasing oxygen concentration at furnace exit. When the weight percentage of auxiliary coal is being raised, the conversion rate of S to SO₂ is largely going up. The SO₂ emission decreases if the desulfurizing agent (CaCO₃) is added during the incineration process, but the desulfurizing efficiency is weakened with the enhancement of the bed temperature. The fuel moisture content has a slight effect on the SO₂ emission. Based on these experimental results, a 12×6×1 three-layer BP neural networks prediction model of SO₂ emission in MSW/coal co-fired fluidized bed incinerator was built. The prediction results of this model give good agreement with the experimental results, which indicates that the model has relatively high accuracy and good generalization ability. It was found that BP neural network is an effectual method used to predict the SO₂ emission of MSW/coal co-fired fluidized bed incinerator.     

Synthesis and characterization of sulfonated poly(arylene ether ketone ketone sulfone) membranes for application in proton exchange membrane fuel cells

A series of sulfonated poly(arylene ether ketone ketone sulfone) (SPAEKKS) copolymers were synthesized by nucleophilic polycondensation. The copolymers exhibit good thermal and oxidative stabilities, all the SPAEKKS copolymers can be cast into tough membranes. Ionic exchange capacities (IEC), water uptake properties, thermal stabilities, methanol diffusion coefficients and proton conductivities were thoroughly studied. Also the microstructures of the membranes were investigated by TEM. The proton conductivity of the SPAEKKS-4 membrane is close to that of Nafion-117 at 80 °C. The methanol diffusion coefficient of the membrane is much lower than that of Nafion-117 under the same testing conditions. The SPAEKKS membranes are promising in proton exchange membranes fuel cell (PEMFC) application.