对均匀传输线分布参数电路的讨论

利用数学物理方程,分析并讨论了高频传输线中分布参数电路的特性及过渡过程.     

我国全民健身路径工程发展历程、存在问题及对策

采用文献资料、数理统计等方法对我国全民健身路径工程的发展历程及发展现状进行综述和分析,提出全民健身路径目前存在的问题如：对健身路径缺乏理性的认识,体育健身路径建设部门与管理部门脱节,参与健身路径的人群中青少年比例偏低,健身路径对残疾人缺乏“人文关怀”,健身路径器械布局和选址缺乏科学论证等,针对这些问题进行分析和研究,为我国全民健身路径的发展提供相应的对策和建议。     

Gender,Rhetoric, and International Political Systems: Angela Merkel's Rhetorical Negotiation of Proportional Representation and Party Politics

This article assesses the ways in which electoral systems present unique rhetorical challenges for women running for elective office, using German Chancellor Angela Merkel as a case study. In proportional systems, much of the rhetorical work occurs at the level of the party, requiring the political woman to capitalize on the rhetorical resources of the party structure in which she finds herself, advancing to party leadership, and eventually localizing the national election via the party structure. However, Merkel's performance demonstrates that the presence of women and of feminine norms of communication can sometimes mask the hegemonic masculinity that continues to govern democratic electoral systems. The authors conclude by considering the utility of the theory of “feminine style.”     

我国创业投资阶段分布不均衡性的形成机理及其影响

通过对1994年以来我国创业投资阶段分布不均衡性的实证分析,引入期望吻合度函数来解释该现象的形成机理,指出创业投资阶段分布不均衡性将容易弱化创业投资孵化高技术产业的产业培育功能、加剧与传统投资方式的不公平竞争、催生或助长经济泡沫和泡沫经济的形成。     

Cheating Partners,Conditional Probability and Contingency Tables

Developing statistical literacy for older school students includes recognizing and interpreting conditional statements in the media. Data on couples' success in predicting whether their partners have cheated provides a motivating context for teachers to lead their students through this process.     

宋代畲族史的几个关键问题——刘克庄《漳州谕畲》新解

本文对于宋代畲族史提出了如下新观点:一、唐末五代出现的"畲山儿"一词,是畲族酝酿时期的称呼;南宋中叶<舆地纪胜>使用的"山客輋",则是正式作为后世畲族族称的最早史例;南宋末期,赣、闽、粤之交的漳、汀、潮、梅、赣五州毗邻区域已成为畲族的基本住地.二、畲族族源主要包含百越后裔、南迁武陵蛮和入畲而被畲化了的汉人三大部分.三、畲族的汉化进程,是与畲族的形成发展史相伴相随的,南宋中后期湘、赣、闽、粤的大规模畲民抗争运动,可说是畲族汉化的正式启动时期.     

Adaptive rotor current control for wind-turbine driven DFIG using resonant controllers in a rotor rotating reference frame

This paper proposes an adaptive rotor current controller for doubly-fed induction generator （DFIG）, which consists of a proportional （P） controller and two harmonic resonant （R） controllers implemented in the rotor rotating reference frame. The two resonant controllers are tuned at slip frequencies ωslip＋ and ωslip-, respectively. As a result, the positive- and negative-sequence components of the rotor current are fully regulated by the PR controller without involving the positive- and negative-sequence decomposition, which in effect improves the fault ride-through （FRT） capability of the DFIG-based wind power generation system during the period of large transient grid voltage unbalance. Correctness of the theoretical analysis and feasibility of the proposed unbalanced control scheme are validated by simulation on a 1.5-MW DFIG wind power generation system.     

基于用户公平性的中继选择算法

本文提出多用户多中继环境下基于用户公平性的最优中继选择算法及低复杂度次优中继选择算法。算法利用跨层信息,最大化系统信息速率并保证各用户信息速率的比例公平性。次优算法在保证系统性能的前提下,降低算法复杂度。仿真结果表明,相较于盲选择算法,该文所提出的算法有效提高系统性能及用户公平性。     

一种基于模糊的技术成熟度可视化方法

为更加直观有效的显示技术的成熟度状态,提出了一种基于模糊的技术成熟度可视化方法。该方法以现有的基于技术完备度等级的技术成熟度评价方法为基础,利用模糊理论的方法对其进行改进,将＂是-否＂满足技术成熟度评价细则特征的评价结果,模糊化为满足评价细则特征的技术状态值。根据所获取的技术在各项评价细则特征上的状态分布值,建立技术成熟度状态分布图。实验结果表明,技术成熟度状态分布图可以清晰的展现技术在发展过程中所处的具体状态。     

一种基于特征聚类的文本分类模型研究

借助特征聚类进行特征抽取是信息检索领域进行文本特征降维的重要手段之一.本文通过χ2统计和特征聚类相结合的模式,在尽量减少信息缺失的前提下两次对特征项维数进行压缩,通过分析特征的类别分布信息,实现了基于统计的特征降维;进而在基于类别概率分布的模式下实现了文本的矩阵表示,借助矩阵范数进行文本分类.实验结果表明,该方法的分类效率较高.