流化床内颗粒磨损研究

通过流化床内颗粒磨损实验,探讨了磨损率随床重、气速及时间的变化关系,并对磨损前后物料粒径分布进行了对比,推断出颗粒的磨损机制．     

超声印制板公司成长的模拟与实证分析

企业成长是一个十分复杂的动态过程，本文对汕头超声印制板公司１９８５年至１９９８年的成长过程和形态进行了实证与模拟分析，并总结和提炼了其成功经验。     

基于稀疏表示和低秩矩阵逼近的图像去噪算法的研究

提出了一种基于稀疏表示和低秩矩阵逼近的图像去噪算法:首先,通过对图像块的数据矩阵进行奇异值分解和全局子空间分析,确定信号子空间和噪声子空间;其次,利用图像块与信号子空间的距离寻找相似块,并将相似块分组为训练样本;再次,对相似块矩阵进行奇异值分解,并确定表示相似块的奇异向量;最后,去除表示噪声的基.实验结果表明,该算法能...     

Microstructure characterization of early corrosion behavior of AM60B magnesium alloys

The microstructures and corrosion behavior of AM60B magnesium alloys, produced by both high-pressure die casting (HPDC) and super vacuum die casting (SVDC) processes, were investigated by a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM), and slow positron beam technique. XRD confirmed that calcium carbonate (CaCO3) deposited on the surface of alloys during the early stages of corrosion, and the deposition rate of CaCO3 for SVDC with corrosion time was slower than that of HPDC. SEM observation found that the -phases in the skin surface of SVDC alloy had a greater volume fraction and more continuous distribution than that of HPDC alloy, leading to lower volume fraction of CaCO3 deposited on surface of SVDC alloy for the same corrosion time. The slow positron beam Doppler broadening measurement revealed that the thickness of surface corrosion layer increased with corrosion time. Compared with HPDC alloy, the increase rate of thickness for SVDC alloy is slower, which implied that SVDC alloy exhibited a better corrosion resistance than HPDC alloy.     

黄海西岸胶州湾至海州湾段全新世海岸变迁

根据海蚀、海积地貌特征，分析了黄海西岸海州湾到胶州湾这段岸全新世以来的海岸变迁过程，认为该区中全新世曾出现过高于现代海平面１．５米左右的高海面。     

YFJ(巴柯)型离心式粉尘分级仪与标准筛的联合使用

在研究YFJ（巴柯）型离心式粉尘分级仪离心分离原理的基础上，得到了筛分直径和沉降直径的换算关系，并将两种常用的粉尘粒径分布测量方法--沉降法和筛分法进行了联合运用，弥补了运用单一方法测定时受粒径测量范围限制的不足，平滑地连接了两条粒径分布曲线，精确了中位径（d50）值.     

基于Java/J2EE的WebGIS设计及实现技术

WebGIS发展的重要方向之一,文章首先讨论了当前WebGIS主要的实现方法,然后设计并实现了一个基于Java／J2EE的WebCIS系统。     

微机在脉象测量分析中的应用

从医生诊脉的物理过程出发，研制了微机诊脉所必备的电子电路及微机控制诊脉的方法，给出了微机诊脉设备的全部硬件及软件框图、工作原理及主要设计要求，并指出了采用递推算法来提高检测精度的必要性及优越性。     

Two neuropeptides from synganglia of the hard tick, Ixodes sinensis （Acari： Ixodidae）

Two neuropeptides were isolated from synganglia (central nervous system) of the hard tick, Ixodes sinensis. Their primary sequences were established as Leu-Val-Val-Tyr-Pro-Trp-Thr-Lys and Trp-Glu-Lys-Leu-Gly-Ser-Met-Glu-Thr-Leu. By hot plate bioassay, neuropeptide a displayed strong antino-ciceptive effect in mice by a dose-dependent behavior, while neuropeptide b had some relaxant effects on the isolated rat strip. These neuropeptides might be involved in down-regulating the host's defensive reaction.