混沌运动的分析及判断

本文总结了混沌运动的特点及判断浑沌运动的几种方法，这些方法是分析混沌运动和其它非线性现象的重要方法。     

非晶FeSiBCu合金系的磁后效

研究了非晶ＦｅＳｉＢＣｕ合金系的磁后效，结果表明淬态Ｆｅ基非晶合金的磁后效主要来自磁致伸缩相互作用，然而还发现磁后效和感生磁各向异性对Ｃｕ含量有类似的依赖关系，这显示还应考虑感生磁各向异性磁后效的影响。     

次酉矩阵及次酉变换

本文在酉空间中引进了次酉矩阵和次酉变换，推广了酉矩阵和酉变换的定义，并得到一些结果，这些结果推广了文[4]中的相应定理。     

贺兰山蓝丝膜菌菌丝体生长特性的研究

对贺兰山蓝丝膜菌（Ｃｏｒｔｉｎａｒｉｕｓｃａｅｒｕｌｅｓｃｅｎｓ（Ｓｃｈａｅｆ．）Ｆｒ．）菌丝体在纯培养条件下的生长特性进行了研究．结果表明,菌丝体最适生长温度为２０～２５℃,最适生长ｐＨ值为６,长势最好的培养基为ＰＤＡ综合培养基,蛋白胨、葡萄糖为最佳氮碳源     

Influence of chemical liquids on the fatigue crack growth of the AZ31 magnesium alloy

The fatigue crack growth behavior of an AZ31 magnesium alloy was investigated by comparing the effect of zirconate and phosphate chemical liquids. The morphology, components, and phase compositions of the chemical depositions at the fatigue crack tip were analyzed by employing scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD), respectively. For samples with and without the chemical liquids, their stress-intensity factor values at the fatigue crack tip were compared by using a stress-strain gauge. The results demonstrated that a zirconate film (Zr_xO_y·Zn_xO_y) and a phosphate film (Zn₃(PO₄)₂·4H₂O and MgZnP₂O₇) could be formed on the fatigue crack-surface at the fatigue crack tip. The stress distribution was changed because of the chemical depositions and the causticity of the chemical liquids. This could decrease the stress-intensity factor value and thus effectively cause fatigue crack closure, which reduces the fatigue crack growth rate. Moreover, it was found that the fatigue crack closure effect of zirconates was more positive than that of phosphates.     

Trends of the precipitation acidity over China during 1992–2006

The trends of the precipitation acidity from 1992 to 2006 were studied, based on the long-term acid rain observations at 74 sites in China. The results show that there was no remarkable change or extension of acid rain area (i.e., with annual mean of precipitation pH<5.6) during the 15 years. The largest and continuous acid rain area exists in the south of the Yangtze River, while the acid rain areas north of the Yangtze River remain separate. The severe acid rain area (i.e., with annual mean of precipitation pH<4.5) exists mainly in the south of the Yangtze River. The overall precipitation acidity for the 74 stations showed different trends before 1999 and after 2000. In the period 1992–1999, the precipitation acidity at most of the sites remained steady or showed a decreasing trend. After 2000, however, an increasing trend of the precipitation acidity was observed at many sites in North China, Central China, East China, and South China. As a result, the pattern of acid rain area changed during 1992–2006. The precipitation over North China, Central China, and South China became more acidified in the 15 years, with more pronounced trends in North China and the north of Central China. A slight decrease in the precipitation acidity was found in Southwest China, an area characterized as severest acid rain area for about two decades after the early 1980s. Consequently, the center of severe acid rain area in the south of the Yangtze River moved eastwards. The non-hydrogen conductivity (NHC), which is defined as the difference between the measured precipitation conductivity and the H+ conductivity calculated from measured pH, was estimated and treated as a proxy of soluble ions in precipitation. The result shows that the overall trend of the NHC before 1999 was pronounced and positive, while the trend after 2000 was inconspicuous or slightly negative. During 2000–2006, the change rate of pH was positively correlated to that of the NHC at 21 sites, implying that the increasing acidities found at these sites may partly be attributed to the decrease in the concentration of airborne particulate matter in recent years.     

基于模糊聚类算法的精炼过程真空系统故障诊断

针对大型真空冶金系统(DVMS)的故障点多、故障征兆不明显且要求其故障诊断快速、准确的特点,提出了一种基于模糊聚类算法的智能诊断模型·该模型具有很强的自学习、自组织能力适用于大型复杂真空系统的故障诊断·在介绍了模糊聚类算法的理论同时,给出了模糊故障诊断的步骤·以RH KTB真空冶金系统的智能故障诊断为例给出了模糊诊断的实际过程·通过分析证实了该算法对大型复杂真空冶金系统智能故障诊断的有效性·     

对数平均值的极小积问题

考虑一类含参数对数平均值的极小积问题。利用对数平均值不等式，问题转述为不含对数的参数规划问题。作为它们的应用，如果涉及的函数均为线性齐次、约束集为凸多面体（无论有界或无界），则必存在最优解并且可以在其极点处实现。     

巴尔虎人5项舌运动类型的人类学研究

对呼伦贝尔市286例(男95,女191)巴尔虎人的卷舌、叠舌、翻舌、尖舌、三叶舌5项舌运动类型进行了调查研究.结果发现:(1)巴尔虎人卷舌、叠舌、翻舌、尖舌、三叶舌出现率分别为80.42%、6.64%、38.81%、79.72%、16.43%;除叠舌外,巴尔虎人的其他4项舌运动类型在性别间的差异均无统计学意义.(2)在我国各族群中,巴尔虎人卷舌、翻舌出现率偏高,叠舌、尖舌出现率中等,三叶舌出现率偏低.(3)聚类分析结果表明,巴尔虎人与蒙古族其他族群(厄鲁特蒙古族、科尔沁蒙古族、锡林郭勒蒙古族、察哈尔蒙古族、布里亚特蒙古族和乌拉特蒙古族)舌运动类型出现率接近.(4)卷舌与翻舌、尖舌、三叶舌,叠舌与尖舌彼此间存在基因互作关系.巴尔虎人5项舌运动类型具有北亚类型族群的基本特征.