国际机制的创设与国家利益的博弈——一种国际政治经济学的视角

追求国家利益是国家对外行为的根本动因,国际机制的创设与国家利益之间是一个极为复杂的动态博弈。不论是霸权国家还是非霸权国家,作为理性的经济人,都在不同程度上存在机会主义倾向,导致了国际合作的不确定性。根据博弈论等经济学理论,霸权国家主导创设国际机制有其内在动机。国家机会主义行为的产生也有其内在根源,因此在国际机制创设过程中如何减少机会主义的发生,维持稳定的国际合作显得尤为重要。     

Student Mobility in Multilevel Growth Modeling: A Multiple Membership Piecewise Growth Model

This study proposes a new model, termed the multiple membership piecewise growth model (MM-PGM), to handle individual mobility across clusters frequently encountered in longitudinal studies, especially in educational research wherein some students could attend multiple schools during the course of the study. A real data set containing some students who switched elementary schools was used to demonstrate and explain the MM-PGM. Parameter and model fit differences were compared between the MM-PGM and two other techniques for handling student mobility: the first school-PGM, which only used school membership at the first measurement occasion, and the delete-PGM, which removed mobile students from the analysis. Results indicated that the three approaches of handling mobile students led to different conclusions about the impact of school-level predictors of growth parameters and the school-level variability in the growth rates. Furthermore, deleting mobile students altered the impact of student-level predictors compared to the other two approaches.     

双作用叶片泵定子内表面曲线的分析与改进

本文针对目前使用的双作用叶片泵定子内表面存在的缺点进行分析,提出新的解决办法,即用新型的改进型梯形过渡曲线代替传统的等加速等减速过渡曲线.     

Automated Latent Growth Curve Model Fitting: A Segmentation and Knot Selection Approach

Latent growth curve models are widely used in the social and behavioral sciences to study complex developmental patterns of change over time. The trajectories of these developmental patterns frequently exhibit distinct segments in the studied variables. Latent growth models with piecewise functions for repeated measurements of variables have become increasingly popular for modeling such developmental trajectories. A major problem with using piecewise models is determining the precise location of the point where the change in the process has occurred and uncovering the related number of segments. The purpose of this paper is to introduce an optimization procedure that can be used to determine both the segments and location of the knots in piecewise linear latent growth models. The procedure is illustrated using empirical data in order to detect the number of segments and change points. The results demonstrate the capabilities of the procedure for fitting latent growth curve models.     

曲线拟合问题的空间理论基础

曲线拟合问题至今尚未确立精确度概念．本文利用泛函分析理论，确立了曲线拟合问题的空间理论基础，给出了曲线拟合间题的精度概念和构造满足指定精度要求的拟合曲线的方法．     

浅析封闭曲线上的曲线积分

本文介绍曲线积分的一种新解法,主要利用求条件极值的方法确定积分区间;利用封闭曲线的特征确定被积函数的形式;利用二次型化简曲面方程。并给出了解决此问题的一般方法。     

风窗曲面导线的包络过渡

本文通过对客车弧形风窗玻璃曲面导线的包络线过渡的分析，以得到两侧显得丰满圆滑并有较大的随意性的光滑过渡风窗，并以实例加以说明。     

转动惯量的计算方法

应用微元法给出了在三维欧氏空间中质量曲线和质量立体对任意一条直线的转动惯量的计算公式,并给出了对坐标轴的转动惯量的简化计算公式。     

计及SVC影响的10kV配电线路的理论线损计算

将目前的10kV理论线损分析方法扩展到包含静止无功补偿器(SVC)的计算中。在线性控制方式的基础上，建立SVC补偿容量的表达式，并配合迭代算法进行求解。从而能够计算整个10kV配电线路的理论线损．并在实际线路上进行了试算。方法简单实用，为进一步优化分析提供了根据。     

利用三次B样条函数作等值线分析

为了解决传统地图等高线、天气图等值线手工分析的缺点,而以计算机自动分析作替代。通过考察插值、拟合几种数学方法,提出如何应用三次B样条函数,处理格点数据,寻找等值控制点,进行曲线拟合,这一方法具有客观化程度高、分析速度快且线条光滑等特点。