位移无静差ITAE最优传递函数的研究

位移无静差ITAE最优传递函数具有较好的平稳性和快速性,是一组适用于工程控制系统的最优参数。首先介绍了ITAE最优传递函数,然后研究了ITAE最优传递函数的极点分布、时域响应和频域响应,最后研究了ITAE最优传递函数的分母多项式系数与加权矩阵的关系。研究结果将大大促进ITAE最优传递函数的广泛应用,为进一步研究ITAE最优控制问题打下基础。     

Flash Method for the Remote Sensing of the Thermal Diffusivity and the Absorption Coefficient at the Excitation Wavelength of Thin Film Materials

A novel front-face flash-monitoring algorithm for remote sensing of the thermal diffusivity and the absorption coefficient at the excitation wavelength of thin film materials is presented. The method relies on the surface transient temperature vs. time curve initiated by a short-duration heating pulse that is followed by time intervals during which the temperature response depends sensitively on the absorption coefficient and thermal diffusivity. An analytical solution of the problem has been derived to solve the inverse heat-transfer problem and, by comparison with a numerical experiment, to check the accuracy of the proposed algorithm for obtaining the absorption coefficient at the excitation wavelength and thermal diffusivity. The uncertainty of the proposed method is better than 0.1%. Paper presented at the 17th European Conference on Thermophysical Properties, September 5–8, 2005, Bratislava, Slovak Republic.     

归纳概率解释的研究述评

随着概率论的日趋完善，概率演算已经为人们所熟知，尽管科尔莫哥洛夫（Kolmogorov）公理的经济性可以使我们对概率做出多种解释，但对它的解释却漏洞百出。正因如此，人们主要围绕着概率解释的标准、如何对概率进行合理解释以及概率解释未来的发展的方向3个方面，对这个问题进行了广泛的研究。于是主要从这3个方面分别对这些研究成果进行了述评，借此厘清概率解释理论研究发展的总脉络。     

基于Neyman-Pearson信号消噪方法的改进

本文介绍了运用小波变换进行信号消噪的原理，阐述了基于阈值的正交小波变换消噪法，对运用Neyman-Pearson准则进行阈值选定的方法作了改进，使其适合多尺度分解的小波变换，并将电子测量中的38准则用于对噪声强度的估计运算中，实验证明该种方法取得了较好的实用性。     

基于GPS的低成本车载导航设备的研究实现

首先分析车载导航设备的核心功能,说明低成本实现方案的可行性.在此基础上,给出低成本车载导航设备的硬件框架,并对关键部件进行功能阐述.而后从导航原理、嵌入式GIS、图形开发、编码规范、程序运行、内存使用几个方面论述设备的软件系统.接着,通过实验证明该低成本车载导航设备较好地实现了车载导航设备的核心功能.最后,通过与高档车载导航设备的成本对比,体现了该设备的成本低.     

深井开采冲击地压与防治

用矿岩能量指标和岩爆倾向度等多因素评价作为岩爆发生条件的判据，对红透山铜矿的岩爆现象作了这性研究与监测，并介绍了防止岩爆发生的几项措施。     

《城市消防远程监控系统技术规范》正式颁布

本文主要阐述了城市消防远程监控系统建设产生的背景、主要内容、组成部分及建设的意义等内容。     

Is the association between temperature and mortality modified by age, gender and socio-economic status?

Background

A number of studies have examined the relationship between high ambient temperature and mortality. Recently, concern has arisen about whether this relationship is modified by socio-demographic factors. However, data for this type of study is relatively scarce in subtropical/tropical regions where people are well accustomed to warm temperatures.

Objective

To investigate whether the relationship between daily mean temperature and daily all-cause mortality is modified by age, gender and socio-economic status (SES) in Brisbane, Australia.

Methods

We obtained daily mean temperature and all-cause mortality data for Brisbane, Australia during 1996-2004. A generalised additive model was fitted to assess the percentage increase in all deaths with every one degree increment above the threshold temperature. Different age, gender and SES groups were included in the model as categorical variables and their modification effects were estimated separately.

Results

A total of 53,316 non-external deaths were included during the study period. There was a clear increasing trend in the harmful effect of high temperature on mortality with age. The effect estimate among women was more than 20 times that among men. We did not find an SES effect on the percent increase associated with temperature.

Conclusions

The effects of high temperature on all deaths were modified by age and gender but not by SES in Brisbane, Australia.     

中欧规范无腹筋梁抗剪承载力比较

介绍了钢筋混凝土无腹筋梁斜截面抗剪的影响因素,对中欧规范抗剪承载力的计算公式以及抗剪最小配筋率的有关规定进行了对比分析。从而得出中国规范和欧洲规范在混凝土低强度的条件下计算结果相差不大,但在高强度的条件下,中国规范的可靠度指标低于欧洲规范。     

IMC系统的优化滤波器研究

推荐两种滤波器作为ＩＭＣ系统的滤波器。一种是ＩＴＡＥ滤波器，它符合时间乘绝对误差积分值最小的优化原则，即Ｊ＝│ｅ│ｔｄｔ→ｍｉｎ。另一种是Ｂｕｔｔｅｒｗｏｒｔｈ滤波器，它具有很好的理想低通滤波器特性。由于这两种滤波器的全部结构极点均处于Ｓ复平面的高稳定性区域，又是按最优原理确定其参数，因此，采用这两种滤波器可以抑制模型失配导致的不良影响，使得ＩＭＣ系统的鲁棒性更加有保证。本文列举一个工业过程控制例