Harmonic Retrieval Embedded in Hybrid Colored Noise: a Novel Pisarenko Method Based on Cross-high-order Cumulant

Spectral estimation method is an effective method in the case of parameter estimation of sinusoid signal in noises.It always applies cross-spectral estimation theory and high-order self-spectral estimation methods up to now.Yule-Walker equation based on cross-fourth-order cumulant is developed and Pisarenko method is provided in this paper.Simulation results show that the method is effective to retrieve sinusoid signal frequencies from hybrid colored noises and has good performance.     

微合金高强钢水下焊接CGHAZ中的沉淀物

对Ｘ６０、Ｘ６５和Ｘ７０三种微合金高强钢（石油、天然气输送管线用钢）水下及空气中焊接影响粗晶区（ＣＧＨＡＺ）中的沉淀物及其溶解、再析出、长大等行为进行了考察。结果发现，在水下焊接过程中富Ｔｉ粒子几乎不溶解而富Ｖ粒子较易溶解，水下焊接同空气中焊接相比ＣＧＨＡＺ中深沉物的溶解。再析出和长大等行为均有明显差异。     

Experimental Research on the Wearability,Corrosion Resistance,and Life Assessment of an Aluminum Alloy Bridge Deck

<正>Introduction In recent years the production of aluminum alloy has leaped to second place in overall metal material pro-duction, surpassed only by steel. In addition to use in the aviation industry, aluminum alloy has begun to be applied in the machinery manufacturing industry and     

优化OMR GYQ-S30型阅卷系统成绩处理软件的实现方法

分析ＯＭＲ ＧＹＱ－Ｓ３０型阅卷系统成绩处理软件使用问题，介绍其优化与改进方法。     

Linking innate and adaptive immunity

The evolution of mechanisms to fight pathogens in plants and animals is reflected in the complexity of the components of their so-called immune systems. Higher vertebrates have evolved     

Jottings on Chinese Terms(2)：The Appellation of “物质的量”(wuzhideliang) Is Too Unnatural

英语"the amount of substance"一词被有关部门定名为"物质的量",已经多年了.本人作为一名教化学的教书匠,深感此词之别扭,特借贵刊一块宝地,说说自己的烦恼,并求助于诸位.     

Genetic study on the behavior of honeybees influenced by polyandry system

Within a honeybee population, due to polyandry, there are supersister and halfsister relations, thus many subfamilies exist. For the Chinese honeybee (Apis cerana cerana F.) a phylogenetic dendrogram has been constructed in which 4 subfamilies are clustered based on DNA fingerprint patterns. And it has been observed that each kind of workers is distributed to several dierent sub-families.     

创新型人才与知识经济

文章阐述了知识经济的内涵和特征，指出为迎接知识经济的挑战，必须提高我国的科技支撑力，培养出一批高素质的创新型人才，并改革、完善现行的人才使用与管理制度     

格子Boltzmann BGK模型中的矩方程

应用Chapman－Enskog展开和多重尺度技术求取二阶、四阶粘性系数及三阶色散系数；给出Navier－Stokes方程所要求的平衡态分布函数的高阶矩形式．     

航天器火工品参数计算机自动检测系统

论述航天器火工品参数计算机自动检测系统的硬件和软件构成、系统工作原理及检测技术，研究检测数据的处理方法．检测系统对数据库的直接读写操作．实现检测系统与数据库管理系统的快速数据交换．实际使用表明系统测量精度高、速度快、效率高．