基于混合策略博弈的我国优秀运动员流动影响因素分析

建立以优秀运动员、运动员现所属组织和流动目的组织为博弈主体的混合策略博弈模型,并对其策略选择进行分析。依据纳什均衡解得出注册优先权是影响运动员流动的核心要素,运动员现所属组织使用注册优先权与否,很大程度上决定了运动员流动或者流动的流畅性;转会费、制度成本和契约成本也是影响运动员流动的因素;运动员流动的概率与注册优先权成负相关的关系;组织间利益的负关联妨碍了我国优秀运动员流动各利益方合作共赢的意愿和行为。提出逐步限制注册优先权、完善转会费制度、增加训练补偿金等建议。     

Home advantage in speed skating: Evidence from individual data

Home advantage is a well-documented phenomenon in many sports. Home advantage has been shown to exist for team sports (soccer, hockey, football, baseball, basketball) and for countries organizing sports tournaments like the Olympics and World Cup Soccer. There is also some evidence for home advantage in some individual sports, but there is a much more limited literature. This paper addresses the issue of home advantage in speed skating. From a methodological point of view, it is difficult to identify home advantage, because skaters vary in their abilities and the conditions of tournaments vary. There is a small but significant home advantage using a generalized linear mixed model, with random effects for skaters and fixed effects for skating rinks and seasons. Even though the home advantage effect exists, it is very small when compared to variation in skating times due to differences of rinks and individual abilities.     

贝特格子上纵场作用下的混合自旋模型性质研究

利用迭代方法,在铁磁情况下,研究了外场作用下二重Cayley树上自旋为1／2和3,2的混合Ising系统的热力学性质。通过数值求解,得出了亚晶格磁化强度MA,MB和总磁化强度M随温度变化的曲线。研究发现,亚晶格磁化强度MA、MB以及总的磁化强度在相同的外场条件下的变化趋势是一致的,只是饱和磁化强度数值有所不同,通过外场取值的不同,发现存在外场时与外场取零时磁化强度随温度变化趋势有所区别。结果还发现,铁磁情况下不管是否存在外场该系统都不存在三临界行为。     

我国海洋经济运作效率的测量——基于混合型网络DEA模型

我国海洋经济正处于转型升级的关键阶段。测量我国蓝色经济区的海洋经济运行效率,挖掘其运行非效率环节,有利于海洋产业结构的整合优化。采用混合DEA结构模型对蓝色经济区内11个省(区、市)的海洋经济效率进行测量,得出海洋经济效率最优的区域,并对非效率产业和区域的弱势环节进行挖掘,证实了混合结构更加符合现实中海洋生产结构。改进后的DEA模型比传统DEA模型更能准确、客观地刻画最优生产前沿面。     

林改后闽浙赣家庭林业全要素生产率变动比较

为了找出集体林权制度改革后家庭林业全要素生产率(TFP)的变动规律,论文以闽浙赣2004-2009年237个林农的跟踪调查数据为基础,以农户家庭林业经营为决策单元,以林地面积、劳动力、资金为投入变量,以林业总产出为产出变量,运用DEA-Malmquist模型测算TFP,运用Tobit回归找出关键影响因素,并进行对比分析。结果表明:技术进步是家庭林业TFP增长的主动力。闽浙赣家庭林业技术进步年均增长率依次为-4.3%、13.4%、8.9%,使得其TFP年均增长率差异很大,依次为-4.4%、9.1%、5.8%。规模效率变动及生产要素配置水平变动的个体差异较大,直接导致三省家庭林业TFP变动的个体差异均较大,且浙江、江西远大于福建,均需要扩大林改成果的社会惠及面。虽然对各省家庭林业TFP产生显著影响的因素有所不同,但户主受教育年限、林业经营条件、资金来源渠道和林业管制政策执行属于影响两个省的共同因素。强化林业科技推广、加快林地流转、加强新型林农培育、加大林业基础设施建设、健全林业多渠道融资机制和规范政策执行等措施有利于家庭林业生产力水平持续增长,规范林地流转、发展林农专业合作组织和促进林农相互交流等措施有利于扩大林改成果的社会惠及面。     

Effect of Mixed Solvents and Additives on the Habit Modification of 6-APA Crystals

6-aminopenicillanic acid (6-APA) crystals obtained under different physical and chemical conditions of the solutions may present different habits. The habits of diamond-shaped plates are desirable compared with other habits of 6-APA crystals. To obtain ideal 6-APA crystals, the effects of the mixed solvents and additives on 6-APA crystal habits were investigated. Ethanol or acetone was used as the organic solvent, and impurities existing in the ,6-APA purification process were used as the additives. 6-APA growth habits were changed when the concentrations of ethanol, acetone or phenyl acetic acid were increased to exceed their critical concentration. The observed results show that the dominant face on 6-APA crystals was identified to be , {020}, but the overall habit was controlled by the relative growth rates of the : 101 and {002} faces. Crystal growth rates and habits can be appreciably changed by specific adsorption of additives on crystal faces. In some cases solvent molecules can act in a similar way and may be regarded as bulk additives. The effects of additives and organic solvents on 6-APA crystal habits were the results of adsorption effect,which fitted the experimental results quite well.     

安康汉滨方言的句末助词“在”

安康汉滨方言属于中原官话关中片,但其方言中却活跃着一个中原官话区没有而广泛存在于西南官话、江淮官话等方言区的句尾助词"在"。本文描写了安康汉滨方言句末助词"在"的句类、句式分布情况及其语法意义,并将其与西安方言、成都方言、英山方言的同义表达句式相比较,指出安康汉滨方言因为受周边西南官话和江淮官话的影响,具有明显的混合特征。     

如何鉴别史书韵语中所包含的方言

史书中所透露出的方言痕迹是非常宝贵的,如果把这些线索整理出来,就能为某一个时期的语音研究提供很有价值的参考。但是史书语料的方言成分往往和共同语交织在一起,其韵语的性质较为复杂,因此如何把方言从共同语中搜寻出来,是我们在研究史书韵语时需要考察的一个重要问题。笔者认为,可以通过选取典型作家的作品以及合韵这两种方法来鉴别史书中的方言。     

无线传输森林防火报警系统

＂无线传输森林防火报警系统＂以分散安装在森林里的火源探测器为基本构成单元,探测器以太阳能电池为电源,由红外火源探测装置和ZigBee构成的无线收发装置等部分组成,以无线方式进行通讯,并通过互联网将火警传送到森林防火指挥中心。为防止信号淹没,保证实现系统功能,给出了通信协议,并实现了通信仿真。     

海南岛东部滨海砂矿废弃地植被恢复效应的比较研究

海南岛东部海岸钛锆砂矿废弃地采用木麻黄进行植被恢复,通过对有残余西瓜藤蔓和稀土肥料处理的木麻黄林地（处理林地）与没有任何处理的木麻黄林地（对照林地）进行比较研究.结果显示：1）处理林地林木的树高、基径、胸径均显著大于对照林地;2）处理林地植物-土壤系统中各分室的养分元素N、P、K含量均大于对照林地对应值;3）两个林地中养分元素的分布格局均为：叶〉粗枝〉根〉土;4）两个林地植物-土壤系统各分室的养分元素有着相似的季节变化.处理林地的植被恢复优于对照林地.