能源社会核算矩阵模型的构建与应用

本文扩展建立了2005年中国能源SAM,通过设定能源效率不变和提高两种情景,构建了能源SAM模型并使用该模型定量测算了不同情景下四万亿元投资对各部门总产出、GDP、能源需求量和单位GDP能耗的影响。测算结果说明在能源效率不变的情景下这一投资将带来GDP增长59702亿元,能源需求增长52739万吨标准煤,通过优化产业结构降低单位GDP能耗4.932%;在能源利用效率提高5%的情景下则可以带来GDP增长59795亿元,能源需求增长51212万吨标准煤,通过技术进步和产业结构优化的综合效应降低单位GDP能耗5.419%。     

Graphical Tests for the Assumption of Gamma and Inverse Gaussian Frailty Distributions

The common choices of frailty distribution in lifetime data models include the Gamma and Inverse Gaussian distributions. We present diagnostic plots for these distributions when frailty operates in a proportional hazards framework. Firstly, we present plots based on the form of the unconditional survival function when the baseline hazard is assumed to be Weibull. Secondly, we base a plot on a closure property that applies for any baseline hazard, namely, that the frailty distribution among survivors at time t has the same form as the original distribution, with the same shape parameter but different scale parameter. We estimate the shape parameter at different values of t and examine whether it is constant, that is, whether plotted values form a straight line parallel to the time axis. We provide simulation results assuming Weibull baseline hazard and an example to illustrate the methods.     

逆算符方法求解非线性方程简介

本文首先简单介绍了逆算符理论，然后用该方法求解了强非线性ＲＬＣ电路方程，从而表明逆算符方法与计算机结合在非线性物理中有广泛的应用前景。     

关于分块矩阵的谱包含性质

本文讨论了一类分块矩阵的谱分布定理,指出了文[1]中谱包含域的错误,给出了修正的正确结果。     

Antipodally symmetric distributions for orientation statistics

The conventional antipodally symmetric Bingham matrix distribution on the Stiefel manifold is generalized. Large sample maximum likelihood estimation and uniformity tests are discussed, and a parametric model for axial orientations (X-shapes) is suggested. A generalization of the Khatri-Mardia matrix distribution is developed to provide a model suitable for hybrids (T-shapes).