Synthesis of a proposed structure for the diffusible extracellular factor of Xanthomonas campestris pv. campestris

A proposed structure for the diffusible extracellular factor (DF) of Xanthomonas campestris pv. campestris (Xcc) has been synthesized. Its MS spectrum and biological activity, however, contradict those of the natural product previously reported, suggesting that the structure for DF of Xcc must be reexamined.     

Developing an algorithm for compression, multiplexing and enhancement of multiple images

Image compression is one of the important fields that has useful applications in data storage and transmission. In this research a new algorithm is developed and tested for multiple-image compression and enhancement. The algorithm, in addition, is applied to multiple noisy images. Also, the effect of compression ratio on the peak signal to noise ratio (PSNR) is explored by applying different compression ratios. The developed algorithm gives good compression and noise immunity. It can be used for storage/transmission of encrypted and compressed information.     

AN ADAPTIVE OPTIMAL KALMAN FILTER FOR STOCHASTIC VIBRATION CONTROL SYSTEM WITH UNKNOWN NOISE VARIANCES

In this paper, an optimal criterion is presented for adaptive Kalman filter in a control system with unknown variances of stochastic vibration by constructing a function of noise variances and minimizing the function. We solve the model and measure variances by using DFP optimal method to guarantee the results of Kalman filter to be optimized. Finally, the control of vibration can be implemented by LQG method.     

高炉余压透平发电机组（TRT）异常振动原因分析

以1台高炉余压透平发电机组一次振动超标导致停机为切入点,分析了引起振动的主要原因,并详细介绍了该次事故的处理方法,并对机组以后运行和检修应考虑的问题提出了一些改进建议。     

基于LQR-IMCS算法的智能结构振动主动控制

为了解决最小控制综合（MCS）算法在快速扰动下缺乏鲁棒性和线性二次调节器（LQR）在非线性扰动下容易失稳的问题,构造了一种自适应增益补偿函数,对标准的MCS算法进行改进.提出了基于LQR-IMCS（改进的最小控制综合）算法的新策略,并通过波波夫准则验证了该系统的稳定性.以实验室压电壁板结构的第1阶振动模态为研究对象,分别施加随机扰动和高次谐波扰动.仿真和实验结果表明：该方法相对于标准的MCS算法具有更快的收敛速度和更小的跟踪误差,对壁板的第1阶模态抑制具有良好的控制效果和鲁棒性.     

振动理论在低应变测桩曲线分析中的应用

采用振动理论分析方法分析了两种特殊情况下的低应变测桩的典型曲线，一种是垫层已施工情况，另一种是桩头出露地表较长情况，建立以二地某些特殊曲线采用振动理论结合弹性波理论的分析方法。     

80C31BH在信号检测中的应用

利用单片微机８０Ｃ３１ＦＨ的特殊功能，外加８１Ｃ５５、２７Ｃ６４及４５１４等外围芯片构成一频率信号的数字检测分析仪。介绍了它的检测原理、硬件设计和软件设计，该仪器具有记忆强、功耗低等优点，为频率信号数字检测定量分析了开辟了一条新的途径。     

Boundary derivatives of the phases of inner and outer functions and applications

We prove that boundary derivatives of the phases of inner functions exist and are positive almost everywhere, but those of outer functions, on the other hand, have zero mean on the boundary. The concepts and results have definitive applications to the definitions of instantaneous frequency and mono‐components complying with requirements in physics and contemporary study of analytic signals. Copyright © 2008 John Wiley & Sons, Ltd.     

信号处理技术在示波分析中的应用

综述了从1991－1999年信号处理技术在示波分析中的应用情况．