ON THE CALCULATION OF MESOPORE SIZE DISTRIBUTION BY THE GAS ADSORPTION METHOD

Seeing that some commercial gas adsorption instrument still uses a too rough method for cal-culation of mesopore size distribution, we reviewed some practical methods of calculation so farproposed in the literature. We have found that most of these methods and many books have someincorrectness in the geometric factor Q_i used for the calculation of pore volume △V_i from corevolume △V_i~k. It has been proved that the correct expression for Q_i should be[_i/(_i~k+1/2△t_i)]~2for cylindrical pores, _i,/(_i~k+1/2△t_i)for slit-shaped pores. On the basis of this correct Q_i,these methods were applied to the desorption isotherms. The results were compared and analyzed.     

浅谈太原市呼延水厂二期工程电气设计

从供电电源选择、变配电系统设计、变配电站设置、照明设计、防雷设计、电缆敷设设计等方面介绍了太原市呼延水厂二期工程电气设计的主要内容。     

Ⅰ型极值分布样本异常值的Irwin型检验

考虑Ⅱ型极值分布总体,给出了判断样本异常值的Irwin型检验统计量的分位点以及模拟试验的功效。其中部分结果已被国家标准GB6380—86所采用。     

乌斯特3型纱线毛羽测试的应用研究

从毛羽测试目的着手,介绍乌斯特3型毛羽测试原理及特点,对某些术语做了解释,如毛羽H、毛羽不匀率CV_h、毛羽最大最小值等。图示说明了毛羽的变化图、波谱图、变异-长度曲线,频率分布图及其对纱线表面结构进行分析的价值。     

Parametric adaptive time-frequency representation based on time-sheared Gabor atoms

A localized parametric time-sheared Gabor atom is derived by convolving a linear frequency modulated factor, modulating in frequency and translating in time to a dilated Gaussian function, which is the generalization of Gabor atom and is more delicate for matching most of the signals encountered in practice, especially for those having frequency dispersion characteristics. The time-frequency distribution of this atom concentrates in its time center and frequency center along energy curve, with the curve being oblique to a certain extent along the time axis. A novel parametric adaptive time-frequency distribution based on a set of the derived atoms is then proposed using a adaptive signal subspace decomposition method in frequency domain, which is non-negative time-frequency energy distribution and free of cross-term interference for multicomponent signals. The results of numerical simulation manifest the effectiveness of the approach in time-frequency representation and signal de-noising processing.     

多绳摩擦提升机绳槽磨损的一般规律

本文建立了绳槽磨损的一般微分方程.并通过具体数值计算研究了不同条件下的磨损规律.     

关于维纳过程增量的讨论

关于Winener过程增量有多大的研究前人已经得出了一些重要的结论,本文利用正态分布尾概率不等式和Borel-Cantelli引理等工具,对Wiener过程在区间[0,T]以及长度为aT的子区间上的一个线性组合的增量问题进行了探讨,得出了关于线性组合在区间[0,T]以及长度为aT的子区间上的增量有多大的一些重要结论,本结论是对Csórgó.M和Révész.P两人关于Winener过程增量有多大重要结果的推广。     

关于各生产要素按贡献参与分配制度的几点思考

阐述了健全劳动、资本、技术、管理等生产要素按贡献参与分配制度的必要性和重要性,分析了具体操作中应注意的几个问题。     

盲巷瓦斯规律及排放方法

以盲巷瓦斯为主要研究对象,阐述了盲巷瓦斯的分布规律,探讨了排放瓦斯的方法和注意事项。     

供配电自动化系统GIS模块功能的研制

分析GIS用于配电网管理中的部分技术方法 ,以及在GeoStar平台下开发供配电网地理信息模块的基本功能