基于高阶空间精度格式和嵌套网格对旋翼尾迹捕捉的改进

发展了一种基于高阶迎风格式和嵌套网格捕捉直升机悬停旋翼涡尾迹的方法.无粘通量采用Roe Reimann求解器,使用改进的5阶加权基本无振荡(WENO)格式对交界面左右状态进行高阶插值,并与MUSCL插值进行比较.为便于捕捉尾迹和实施周期性边界条件,计算采用结构嵌套网格,其中高质量的旋翼网格完全嵌套于背景网格中.当解达到近似收敛后在桨尖涡分布区域对背景网格进行加密,如此经过3次得到优化的背景网格.考虑到WENO格式插值的特点,提出了搜索3层洞边界和人工外边界的方法以便插值的直接进行.用该方法对一跨音速和一亚音速悬停旋翼粘性流场进行了数值计算.数值结果表明:所发展方法对涡尾迹具有很高的捕捉能力;与MUSCL格式相比,WENO格式具有较低的数值耗散.     

Term Limits,Campaign Contributions,and the Distribution of Power in State Legislatures

Using campaign contributions to legislators as an indicator of member influence, we explore the impact of term limits on the distribution of power within state legislatures. Specifically, we perform a cross‐state comparison of the relative influence of party caucus leaders, committee chairs, and rank‐and‐file legislators before and after term limits. The results indicate that term limits diffuse power in state legislatures, both by decreasing average contributions to incumbents and by reducing the power of party caucus leaders relative to other members. The change in contribution levels across legislators in different chambers implies a shift in power to the upper chamber in states with term limits. Thus, the impact of term limits may be attenuated in a bicameral system.     

中国共产党与中国特色社会主义事业总体布局

摘要：中国特色社会主义事业总体布局大体经历了四个发展阶段：前期探索阶段、初步形成阶段、完善与充实阶段和重大推进阶段。这是中国共产党在领导人民建设中国特色社会主义的探索实践中不断深化认识的结果,反映出我们党是一个实事求是、与时俱进、开拓创新的马克思主义政党,这必将坚定我们在其领导下实现中华民族伟大复兴的信心。     

与时俱进 推动党校教学事业发展

党校工作历来是党的工作的重要组成部分，也是党的建设的一项重要内容。从党校教学事业发展过程，可以清晰地看到党的建设演进轨迹。     

SELF-CONCEPT, NEGATIVE FAMILY AFFECT, AND DELINQUENCY: A Comparison Across Mexican Social Classes

Using a semistructured measure to minimize cross-cultural biases, we examined the relationship between negative self and family-other affect and delinquency among 135 Mexican families of varying social class. The results indicated that: (a) both processed and released delinquent youths and their parents evaluated themselves more negatively than nondelinquent youths and their parents; (b) appraisals in the families of processed and released delinquents did not differ appreciably; (c) migrant families tended to manifest the most negativity and lower-class families the least, with middle-class families in between; and (d) socioeconomic status did not predict the relationship between family hostility and delinquency. The results are seen as providing more support for the family control theory of delinquency than for processing-labeling theory.