培育中小民营企业技术创新能力的政策体系构建

技术创新是中小民营企业构建持续竞争优势并在市场中获得超额利润的源泉,也是新经济发展的动力。介绍了培育中小民营企业技术创新能力的典型政策措施,分析了中国中小民营企业技术创新中存在的主要政策问题并提出了相应的构建对策。     

Parallel computing of Ocean General Circulation Model

This paper discusses the parallel computing of the third generation Ocean General Circulation Model (OGCM) from the State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics (LASG), Institute of Atmosphere Physics (IAP). Meanwhile, several optimization strategies for parallel computing of OGCM (POGCM) on Scalable Shared Memory Multiprocessor (S2MP) are presented. Using Message Passing Interface (MPI), we obtain super linear speedup on SGI Origin 2000 for parallel OGCM (POGCM) after optimization.     

应用单片机实现石油温度测量与精度控制的方法

由单片机组成的油温测量系统中 ,采用V/F转换方式采集温度信号 ,利用相对差值计算技术 ,通过软件调整定时计数时间来精确控制测量精度 ,从而使得系统测温精度与电路元件参数无关     

An experimental method for measuring friction behaviors of linear rolling guides

Friction behaviors of linear rolling guides （LRGs） are determined by many factors and are crucial for precision positioning. It is difficult to create an expression to describe the friction behaviors exactly and completely. A new experimental method for measuring the friction behaviors of one LRG individually was developed, and linear motor direct drive technology is utilized in the experiment setup. The position signal is acquired by a grating, and the friction of the LRG is deduced by the product of the mass of the moving part and its acceleration. In the experiment, the LRG can move with the friction only, and the friction transition from normal rolling to pre- rolling stage was detected. The asperities＇ deformations were utilized to explain it. Hysteresis loops and internal loops were measured. The results indicate the non-local memory of the LRG, and the historical trajectory have an important impact on the friction behaviors of LRGs in the pre-rolling stage.     

数字稳定单元通用测试系统研制

本文从数字稳定单元的工作原理出发,研制了一套ＤＳＵ的通用测试系统,对雷达测试具有重要意义。     

基于可交换随机元的U—统计量的渐近性态

把随机变量列的De Finetti 定理推广到取值于一般可测空间的随机元列。由此又获得基于可交换随机元样本的U-统计量的渐近性态。     

万物静观皆自得 四时佳兴与人同

杜甫著名的《绝句》(两个黄鹂鸣翠柳)是传诵千古的诗篇。历来有不少读者从不同的角度对于这首诗给予多种多样的鉴赏和感受。笔者从诗歌描写的4幅画图中看出了这首诗的4句话实际是写了一年四季的蜀地风景,从而表达了作者杜甫对大自然和现实生活由衷的热爱和喜悦之情。     

减少基4FFT算法运算量的措施

推导出计算正序输入ＤＩＦ基４Ｓａｎｄｅ—ＴｕｋｅｅＦＦＴ算法旋转因子指数公因子ｐ的一种简单方法．给出大幅度减少该算法处理程序运算量的几项有效措施．     

氧化铜公度与非公度反铁磁相变的比热研究

利用微机控制的扫描比热量热系统对氧化铜样品从液氮温度到室温作了精细的比热测量,实验在２２７Ｋ和２２１Ｋ附近检测到两个明显的比热反常,其起始转变分别发生在ＴＮ１＝２３１Ｋ和ＴＮ２＝２１３Ｋ,这两个温度值和中子磁散射室验的结果非常吻合。结合人们对ＣｕＯ单晶的中子散射实验,本文指出这两个比热异常分别对应于氧化铜非公度和公度和反铁磁,从非公度到公度的反铁磁转变为一级相变,而顺磁态到非公度反铁磁相的转变为二级相交,Ｔ＝２３０Ｋ处比热跃变量为２．３Ｊ／（ｍｏｌ·Ｋ）。