河北省能源消耗强度变动及因素分解

根据2005-2010年能源消费数据及相关经济数据,分析了河北省能源消耗强度的时空变化特征;运用Laspeyres指数及其分解模型将河北省能源消耗强度的影响因素分解为结构因素和效率因素。结果表明:研究期内河北省能源消耗强度稳步下降,但空间差异较大;研究期能源消耗强度降低主要贡献因素是第二产业能源利用效率的提高;相对于效率份额,结构份额对能源消耗强度的影响很小,研究期内产业结构变动对能源消耗强度降低的总体影响是负面的。     

Structural decomposition analysis on energy intensity changes at regional level

As China’s energy intensity fluctuated in recent years, it is necessary to examine whether this fluctuation happened at a regional level. This paper establishes a decomposition model by using the structural decomposition analysis (SDA) method at a regional level. Then this model is employed to empirically analyze the changes of Beijing’s energy intensity. The conclusions are as follows: during 2002-2010, except petroleum, the energy intensity decreased and the changes were mostly attributed to the technology changes, while the final use variation actually increased the energy intensity; comparing different periods of 2002-2010, the decline rates of energy intensity for coal and hydropower were decreasing, resulting from the production technology being more energy-intensive than before; the energy intensity changes of petroleum firstly increased substantially and then decreased moderately.     

中国石化行业二氧化碳排放的影响因素分解——基于广义迪氏指数分解法

采用广义迪氏指数分解法对我国石化行业2000—2016年的二氧化碳排放演变进行分解,进行阶段性及累计效应分析,考察投资、产出、能源消费以及相应的碳强度、能源强度和投资效率的变化对二氧化碳排放变化的贡献情况。结果表明,投资、产出及能源消费规模是促进二氧化碳排放增长的主要因素;投资碳强度和产出碳强度是主要的促降因素;能源碳强度、投资效率和能源强度作用较弱,具有很大的改善空间,是未来石化行业减碳政策制定的主要着手点。     

How far the apple falls from the tree: Intergenerational transmission of educational attainment in Indonesia

We use five waves of the Indonesian Family Life Survey (IFLS) to create unique father-son matched data of the male population (aged 25–53). Using this data, we investigate the evolution of intergenerational transmission of educational attainment in Indonesia over time, by ethnicities (six major ethnic groups), and by regions (twelve provinces). To estimate the persistence in education (measured as schooling years of the father as a predictor of schooling years of the son), we use coefficient of correlation and regression coefficient methods. Our results from the regression coefficient suggest that persistence in Indonesia is declined over time. Whereas, the results from the coefficient of correlation reveals no secular trend in education persistence over time. Thus, to understand the reason behind the secular trend in the correlation coefficient we decompose the correlation following Checchi and García-Peñalosa (2008). The decomposed intergenerational correlation shows that although the persistence is declined at the lower-end of fathers’ education distribution, it is increased at the top-end of the distribution. Therefore, we argue that the coefficient of correlation should be used with caution while analyzing the education policy particularly the persistence in education. Thereafter, we document the stationary distribution and find the conclusive evidence of non-convergence in educational attainment over time among both, ethnicities and regions.     

过碳酸钠热分解动力学研究(Ⅱ)-最佳实验点的确定

采用置信域容积最小为目标的实验设计方法，对过碳酸钠分解动力学实验进行了统计设计，确定了最佳实验点的位置，研究结果表明，在过碳酸钠分解率0．1及0．85两个位置做实验，能够对过碳酸钠分解动力学模型中的两参数k和t0精确估值。     

对数幂平均

在这编文章中,我们定义了两相异正数的对数幂平均,并从它的分解式得到对数平均分隔幂平均的不等式.     

关于《初等变换的关系及可逆矩阵的分解》的注记

提出了与张新法的《初等变换的关系及可逆矩阵的分解》一文(文[1])的关于“初等变换的独立性”、“可逆矩阵的初等矩阵的分解”等问题不同的看法;指出谢国瑞所编著的教材《线性代数及应用》中的相关例子所用的方法是正确的,其结论也是正确的。     

网格方程组预处理方法研究

对网格方程组作区域分裂并行计算,应用谱等价胜质讨论了变换在预条件迭代中的作用．将近似LU分解与局部正交化方法相结合构造预处理矩阵,并通过算例证明了这种方法的有效性．     

基于DCT-SVD的盲数字水印鲁棒提取算法

提出了一种新的基于DCT-SVD的数字水印算法．该算法将图像分块后,先进行离散余弦变换,再进行奇异值分解,根据数字图像进行奇异值分解后得到的奇异值序列是递减的序列这一特性来嵌入水印．提取水印时不需要原始图像,所以本水印方案是盲的．实验结果表明,该算法不仅对几何失真具有很强的抵抗能力,而且对添加噪声、滤波及JPEG压缩也具有良好的鲁棒性．     

基本初等矩阵与矩阵的分解

给出基本初等矩阵的定义,得出任何方阵都可分解为有限个基本初等矩阵的乘积的结论.