一种互补型自适应滤波最小均方法在SQUID测量的心磁信号中的应用

提出了一种互补型自适应滤波最小均方算法在SQUID测量的心磁信号中的应用，快的收敛速度和很好的跟踪能力通过根据最小均方原则在两个滤波器之间来回转换加权参量来实现     

An Economical Magnetocardiogram System Based on High-To SQUIDs

An economical magnetocardiogram （MCG） system is built in our laboratory. It mainly consists of a MCG data acquisition stage equipped with two high-To superconducting quantum interference device （SQUID） magnetometers, a data processing stage with digital filtering and a one-layer μ-metal magnetically shielded room in conjunction with a high-Tc SQUID based active compensation. Experimental results show that a noise level of pico-tesla in MCG profiles, which is necessary for clinical applications, may be achieved with the system. Moreover, stable and convenient operations of the system are demonstrated with simulating MCG measurements.     

Singular value decomposition with normalized period for magnetocaridiography signal processing

In this paper, we have developed an algorithm based on singular value decomposition (SVD) for matrix. And the novel SVD algorithm with normalized period of cardiac cycles is presented. The results from real magnetocardiography (MCG) data processing show that the new algorithm is better than the standard one not only in suppressing noises, but also in providing high-fidelity MCG signals.     

An NLMS algorithm with optimized preparatory step-size parameters for SQUID-based MCG data processing

We present a new least-mean-square algorithm of adaptive filtering to improve the signal to noise ratio for magnetocardiography data collected with high-temperature SQUID-based magnetometers. By frequently adjusting the adaptive parameter $\alpha $ to systematic optimum values in the course of the programmed procedure, the convergence is accelerated with a highest speed and the minimum steady-state error is obtained simultaneously. This algorithm may be applied to eliminate other non-steady relevant noises as well.     

纤维素类生物质厌氧发酵产氢的研究

以不同的天然堆肥作为产氢菌源,考察了不同纤维素类生物质废弃物的产氢能力.并以麦麸为供氢体,研究了产氢过程的代谢机制和生物液相组成的变化.实验结果证实,在最大产氢能力的批式实验条件下,不同底物的发酵产氢过程基本类似,生物相中氢和二氧化碳的体积分数分别为49%~62%和51%~38%,没有甲烷气体被检出.在此基础上,在5L混合反应器中以玉米秸秆为底物进行了产氢放大实验,产氢速率达0.8~1.2L/h.     

用于心磁图测量的基于高温超导量子干涉仪磁强计的有源补偿

我们建立了一套基于高温超导量子干涉仪(SQUID)的可靠的、经济型的单通道心磁图(MCG)系统,该系统在一个简易的磁屏蔽室(MSR)中运行.实验结果表明,对于消除心磁测量中的环境噪声,简易磁屏蔽室和有源补偿相结合是一个很合适的方案,这种方案对心磁图的普及有实际的帮助.同时,本文给出了一个有源补偿的简单模型,并将计算结果与实验数据进行了比较.