高阶统计量在噪声中谐波恢复的应用

高阶统计量是信号处理的一种新的强有力的工具，近年来在谐波恢复领域取得了很好的应用效果。文中综述了基于高阶统计量的谐波恢复方法以及基于各阶统计量相混合的预滤波谐波恢复方法。表明高阶统计量方法可以有效地抑制有色噪声的影响。     

可视形式代数法——一种实用的空间结构建模方法

采用形式代数法来描述空间结构，详细分析了ＡＬＧＯＲＦＥＡＳ软件的前、后处理功能及其数据结构，编写了形式代数法模型库软件包以及与ＡＬＧＯＲＦＥＡＳ软件之间的接口程序，真正实现了结构计算可视化。     

Precursory SST anomalies associated with the convection over the western Pacific warm pool

The convection over the tropical western Pacific warm pool influences significantly the atmospheric circulation and climate in East Asia. Thus, the precursory signals of the convection may be used in the forecast of summer climate in China. According to the present results, the June-July-August (JJA) mean convection intensity over the warm pool is significantly related to the precursory positive and negative sea surface temperatures (SSTs) in the warm pool and in the equatorial central and eastern Pacific, respectively. It is also related to the simultaneous negative surface temperatures west to the Philippines. The analysis on the SSTs associated with the convection over the warm pool in individual month of summer shows that for the convection in June and July, there are precursory SST signals in the warm pool and the equatorial central and eastern Pacific. Therefore, this study shows that only the convection in June and July, rather than that in August, has precursory SST signals, despite the existence of the precursory signals of the JJA mean convection. Accordingly, it is implied that the interaction among the warm pool, equatorial central and eastern Pacific, and the region west to the Philippines may exhibit distinct features in the precursory period (preceding winter and spring) and in the simultaneous period.     

用超塑性预处理原理细化低碳钢晶粒的研究

利用超塑性预处理细化晶粒原理 ,在低碳钢中加入不同体积分数的第二相粒子ZrC和ZrO2 ,研究了ZrC和ZrO2 粒子体积分数及轧后不同冷却方式对低碳钢组织和力学性能的影响。研究结果表明 ,轧制变形量为 84 %时 ,加入 0 .8%的ZrC粒子 ,采用轧后水冷方式可获得超细组织 ,晶粒尺寸可达到 9.8μm ;加入 0 .2 %的ZrO2 粒子时 ,晶粒尺寸可达 7.8μm。轧后水冷比轧后空冷方式能获得更为细小的晶粒     

浅谈如何提高准备活动的趣味性

本文根据学生的心理特点和兴趣的转移规律,同时结合教学实践认为,提高准备活动的质量,增加准备活动的趣味性练习是关键。     

钢在温锻时的回弹

钢材经精密温锻后,可以显著提高其综合机械性能,减少加工工序。但钢料温锻后,由于回弹量和热弹量将引起锻件尺寸改变。本文针对回弹量的计算进行研究,导出公式,用以确定在指定温锻规范下的回弹量,并绘制成图,便于工程应用。     

简单巨系统研究及其系统动力学分析

研究大量简单个体依照一定规则相互作用而在宏观上表现出群体智能特性可以用于解决一些复杂的问题.通过对一个实际问题-研究生楼问题的观察和分析,研究了单个个体的行为对整个系统带来的影响.在此基础上,提出了相应的数学模型,并进行了分析,得出了几点有价值的结论.     

Miniaturized Cell Lysis Device Using Spherically Focused Ultrasound

A prototype of a miniaturized cell lysis device developed using a concave spherical transducer is capable of lysing bacteria without added chemical denaturants, enzymes or microparticles and is capable ofefficiently lysing yeast without any mechanical or enzymatic pretreatment. The device is designed for miniature bio-analysis systems where cell lysing is needed to obtain intracellular materials for further analysis such as DNA identification. The device lysis efficiency was evaluated using viable cell counts and microscopy.Additionally, the device efficiency was compared with that of traditional chemical cell lysis methods using standard molecular biological techniques such as agarose gels and ultraviolet (UV) spectroscopy. The results indicate that efficient bacteria and cell disruption can be achieved through a low-voltage-driven and spherically focused high-frequency ultrasonic device.     

Boost前置功率因数补偿电路的调制脉宽分析

针对Boost前置电路调整功率因数时控制调制脉冲宽度问题，分析了功率因数条件，推导出Boost电路的调整脉冲宽度函数，指出该函数恰与Boost电路稳态工作条件近似，并讨论了电路理想条件、输出电压纹波、纹波电流和过零点畸变等相关问题。     

基于PB平台的动态数据交换技术

以Excel为例，介绍了在客户/服务器模式中，利用PB中实现动态数据交换（DDE）的方法。