汾河流域降水量及蒸发量的空间变异性分析研究

借助于地质统计学方法对汾河流域的多年平均降雨量和蒸发量的空间变异性进行了分析,揭示了多年平均降水量和蒸发量的空间变异特征,并应用Kriging方法进行空间插值.分析结果表明,汾河流域多年平均降水量和蒸发量在不同的分割距离范围内有不同的空间相关性,多年平均降水量具有比较明显的地带性,蒸发量分布变化地带性不强.     

某煤棚拱桁架结构动力特性及地震响应分析

文章采用数值分析方法,以单榀三心拱桁架为研究对象,分析了该结构在地震作用下的动力特性和动力响应,分析中考虑了不同地震波选取对结构动力响应的影响,可为相关设计和研究提供参考.     

关于图魔幻标号的运算关系

定义图的全魔幻空间及向量空间。证明了f,g∈P(G),则两标号f与g之间相差一个常数,对任何一个向量α_i∈V_(f_i),如果f_i∈P(G),则α_i可由其余α_(i-1)线性表示。给出了快速大规模地构造魔幻树的方法,得到了奇优美标号、优美标号、魔幻全标号之间相互转换的几个结果。     

SIMATIC T-CPU及伺服系统在摇床头中的应用研究

设计了一种基于SIMATIC 317T-2DP与IM174定位模块的伺服控制系统,本伺服控制系统采用松下A5 Minas 伺服电机,运用S7-Technology工程工具中的凸轮组态功能创建凸轮,输出摇床头的普拉特-奥运动曲线,从而使摇床头实现智能化控制.     

项目式教学法应用于EDA本科教学的探索

基于PMBOK原理的项目式教学法是电气电子类课程实践教学的热点.文章首先分析了EDA课程教学的现状及存在的问题,在此基础上将项目式教学法引入到该课程的本科教学中.依此对忻州师范学院电子信息科学与技术专业62名学生进行试点教学,采用专题讲座结合设计项目的实施方法.实践证明,该方法可以很大程度地提高教学效果,培养学生的创新能力.     

中国家族企业人力资源管理存在问题及对策浅析

文章从家族企业人力资源管理过程中存在的问题着手,深入剖析了问题存在的原因,并对家族企业人力资源管理存在的问题提出了有效的应对策略.     

我的管理策略

本文介绍了校长的管理策略,采取的沟通法宝是"校长的短信经".充分挖掘教师的潜能和才智.最大限度地调动其教学的积极性.     

Features of intervertebral disc degeneration in rat’s aging process

Objective: The age-related change is important part of degenerative disc disease. However, no appropriate animal model or objective evaluation index is available. This study aimed to investigate the features of intervertebral disc degeneration in aging process of rats. Methods: 22-month-old Sprague-Dawley (SD) rats were used as spontaneously occurring intervertebral disc degeneration models and 6-month-old rats as young controls. Expression of collagen types II and X was measured by immunohistochemistry. Degenerations of intervertebral discs were scored according to Miyamoto’s method. Numbers and areas of afferent vascular buds were measured. The thicknesses of non-calcified and calcified layers were measured and statistically analyzed. Results: There were less collagen type II expression and more collagen type X expression in the calcified layer of the cartilage endplates and nucleus pulposus in the rats of the aged group than in the young control. There were fewer and smaller afferent vascular buds in the rats of the aged group than in the young control group. The ratio of the non-calcified to the calcified layers in the rats of the aged group significantly decreased, compared with that of the young control group (P<0.01). Conclusion: Rats can spontaneously establish intervertebral disc age-related degeneration. The expression of collagen types II and X, numbers and areas of afferent vascular buds, the ratio of the non-calcified to the calcified layers, and water and glycosaminoglycan contents in the nucleus pulposus are sensitive indexes of intervertebral disc degeneration.     

山西移动GPRS核心网络发展浅析

随着通信行业的快速发展，分组网越来越显示出其在通信行业中的重要地位，文章通过对分组网络未来发展方向的论述，分析了当前形势下中国移动TD的发展策略。