Evaluating effects of atmospheric CO2 on stability of global climate: a cell-to-cell mapping approach

Atmospheric carbon dioxide concentration [CO2], incoming solar radiation and sea ice coverage are among the most important factors that control the global climate. By applying the simple cell-to-cell mapping technique to a simplified atmosphere-ocean-sea ice feedback climate model, effects of these factors on the stability of the climatic system are studied. The current climatic system is found to be stable but highly nonlinear. The resiliency of stability increases with [CO2] to a summit when [CO2] reaches 290 μL/L which is comparable to the pre-industrial level, suggesting carbon dioxide is essential to the stability of the global climate. With [CO2] rising further, the global climate stability decreases, the mean ocean temperature goes up and the sea ice coverage shrinks in the polar region. When the incoming solar radiation is intensified, the ice coverage gradually diminishes, but the mean ocean temperature remains relatively constant. Overall, our analysis suggests that at the current levels of three external factors the stability of global climate is highly resilient. However, there exists a possibility of extreme states of climate, such as a snow-ball earth and an ice-free earth.     

基于检索相关性转移的本体论检索系统

本文在讨论了当前情报检索系统的相关性判断基础上，指出在相关性判断的多维度多层次的复杂概念中用户关心的是语用相关，但多数检索系统仅能提供形式相关，运用本体论的基本原理，建立了本体论的情报检索系统，该系统在一定程度上实现了检索的语言相关判断。     

论体操教学中动作技能的反馈调节

反馈调节应用于体操动作技能的教学,有助于加强教学过程调控的精确性、方向性和目的性,减少教学中不必要的重复和失误,以取得教学调控的经济性、实效性,论述了体操教学中动作技能反馈调节的模式,反馈调节的一般原则与方法等.     

浅谈素质教育

素质教育作为学校的一项重要的长期任务要求我们具有一支素质较高，能够激发学生学习动机的教师队伍。笔者就如何激发学生学习动机做出如下思考：①要加强对学生进行学习目的的教育；②及时反馈与恰当评价；③科学使用奖赏和处罚。     

一种基于力反馈的技能虚拟训练系统构建研究

为了解决当前市面上虚拟仿真训练系统在触/力觉方面显示能力不足的问题,以一站式、全方位、多维度优化为设计目标,设计并实现了融合力（触觉）反馈的技能仿真训练系统。该方案结合力反馈方法、眩晕缓解措施、效果评价体系,最大程度上实现了用户和产品之间的交互性。通过与相关企业和院校合作,设计并实现了一款篮球投篮仿真训练系统,该系统对投篮发力进行数字化反馈式训练,表明效果较佳,具有一定推广价值。     

Peripheral vision and simple catching: The screen paradigm revisted

The importance of effector visual feedback has previously been indicated using an opaque screen to prevent sight of the catching hand for the final 150–200 ms of a flight path of 850 ms in total. Attention was drawn to the finding that the ability to position the arm correctly in the line of flight of the ball deteriorated as a consequence of the number of trials without visual feedback. However, the use of only 20 test trials allows a possibility that the proprioceptive system may be able to re‐establish predominant control under conditions of prolonged visual decrement. In order to verify this notion, the number of experimental trials was quadrupled for 24 subjects of mixed sex in a replication of the initial paradigm.

The results provided preliminary support for the view that the positioning of the catching arm is more seriously affected by visual occlusion than the timing of the grasp phase. However, increments in accuracy of limb orientation were evidenced in all screen conditions, as the number of trials increased. The grasp component of one‐handed catching appeared to remain unaffected by the increase in experimental trials. The relative influence of skill level on catching errors was next addressed by comparing the performance of the six best and worst catchers in the group.

The results did not support previous research which found a relation between skill level and error type. The number of position, but not grasp, errors decreased as a function of task practice for both subgroups. Future investigations should, perhaps, focus on the developmental nature of movement control in one‐handed catching to obtain a clearer picture of this relation.     

关联理论视角下的广告翻译

关联理论使得广告在翻译时借助于不同文化的某种共性,迎合了不同受众人群的口味,同时也起到了良好的宣传效果。文章首先对关联理论和广告翻译分别进行了阐述和分析,进而将关联理论应用于广告中所体现出的具体作用进行了介绍,最后结合具体的实例来表现关联理论的实际表达效果。     

Respectability and Relevance: Reflections on Richard Peters and analytic philosophy of education

Abstract

I argue that, after Dewey, Peters was the first modern philosopher of education to write material (in English) that was both philosophically respectable and relevant to the day-to-day concerns of teachers. Since then, some philosophers of education have remained (more or less) relevant but not really respectable while others have ‘taken off into the skies’ learning acclaim from the philosophical community but ceasing to produce anything which would be of any relevance to teachers in their work. I suggest that Peters might again point the way towards a form of academic philosophy of education that is both relevant and reasonably respectable.     

试论负反馈控制理论在排球教学中的作用

排球教学手段和方法是多种多样的，目的是培养学生的基本技战术能力。本文运用负反馈控制的基本理论，探讨其在教学训练中的基本应用方法和对教师教学的要求，对不同水平的教学有一定参考价值。     

基于TextRank的产品评论关键词抽取方法研究

关键词抽取技术能从海量产品评论文本中挖掘出用户关注的焦点,方便后续为用户推荐合适的产品。经典关键词抽取算法TextRank在迭代计算词汇节点的重要性得分时,忽略了邻近词汇节点的影响力差异。为此,提出一种融合TFIDF与TextRank算法（简称TFTR）抽取评论中的关键词。首先,通过引入用户浏览评论后给出的评论有用性反馈,提高有效评论中出现的重要词语权重,对TFIDF算法进行改进。然后将改进后的词频逆文档频率作为词节点特征权重引入到TextRank算法中,以改进词汇节点的重要性得分分配过程。实验结果表明,相比传统的TextRank算法,TFTR算法提取出的产品评论关键词准确性在P@10标准下提高了15.7%,证明了该算法的有效性。