延长我国运动员运动寿命的研究

运动员的运动寿命降低,势必会给国家人力、物力、财力造成重大浪费.因此,如何延长运动员的运动寿命一直是体育工作者潜心研究的一个问题,本文就影响我国优秀运动员运动寿命的因素进行综合分析,提出了延长运动员运动寿命的对策和建议.     

Crying for Food: The Mexican Myths of ‘La Llorona’ and ‘The Hungry Woman’ in Cherríe L. Moraga

The Mexican legend of ‘La Llorona’ (‘The Weeping Woman’), who drowned her children out of revenge for being abandoned by her lover, and the Aztec creation myth of ‘The Hungry Woman’ — crying constantly for food, with mouths all around her body — have inspired Chicana writers in the symbolic representation of their own yearning, be it sexual, identity-building, or anti-patriarchal. This essay seeks to lay the mythical groundwork within this topic, as well as to illustrate with some particular examples the different reappropriations of these myths in Cherríe L. Moraga, mainly in her play The Hungry Woman: A Mexican Medea (2001). With a view to opening up a past ‘that can provide a kind of road map to our future’ (: ix), these examples of transgressive women will be deprived of the feminine colonial passivity imbued by the dominant male discourse, and analysed as a complex, active, polyvalent mythological female corpus that integrates both life and death, womb and grave. This hybrid approach is inherent to the Aztec mythology on which Moraga relies in order to transcend Manichaeistic resolutions and probe the social, political, and gender reasons leading a hungry mother to commit infanticide.     

Seasonal forcing on the dynamics ofClethrionomys rufocanus: Modeling geographic gradients in population dynamics

We interpret gradients in population dynamics of the gray-sided vole from the southwestern part of the island of Hokkaido to its northeastern part within the framework of a phenomenological model involving the relative length of summer and winter. In Hokkaido, as in other northern regions, both spring and fall is considered as short transition periods between the two main seasons — summer (the primary breeding season) and winter (the non-reproductive or secondary breeding season). We show that the geographic transition in dynamics may be understood as the combined consequence of different patterns of density-dependence during summer and winter, and geographically varying season lengths. Differences are shown to exist between summer and winter with respect to strength of density-dependence. Direct density-dependence, in particular, is stronger during winter than during summer. A model is presented to show how relative lengths of seasons can induce both stable and periodically fluctuating population dynamics. The results are compared and contrasted with what is otherwise known about the gradient in rodent dynamics in Fennoscandia.     

影响川南浅丘区田坎玉米产量的气候条件分析

利用积分回归方法分析气候因子对川南浅丘区田坎玉米产量的影响。结果表明 ,日照、温度及降雨日数是影响田坎玉米产量的主要因子。苗期的高温 ,生育中期光照不足及灌浆成熟期的雨日偏多均不利于提高田坎玉米产量     

EM浸种处理对玉米叶色值的影响

以玉米品种农大108为试验材料,用SPAD-502仪分别测定了不同浓度EM稀释液浸种处理后的叶色值。试验结果表明:利用不同浓度EM(有效微生物群)稀释液浸种及在玉米拔节期叶面喷施并灌根,可显著提高玉米叶片的叶绿素含量。并遴选出玉米施用EM的最佳浓度为500倍稀释液。     

氮磷钾在夏谷不同器官中的分配与转移

利用盆栽试验研究了夏谷单株在不同生育期的氮、磷、钾矿质营养元素在不同器官中的分配与转移规律。结果表明,苗期根中氮、磷、钾的分配比率均在65%～75%,拔节后逐渐下降,至成熟期仅为3%～5%。抽穗开花后,穗中养分含量急剧增加,其中96%的氮增量、48.2%的磷增量和全部的钾增量可通过营养器官的养分运转来获得。叶片与叶鞘的氮磷素运转率与运转量均最高。叶片中的钾从开花期开始明显减少,根与叶鞘中的钾前期最多,以后逐渐减少,部分被排出体外。收获时分配于穗部的氮、磷、钾分别占全株总量的68.39%、67.95%和24.91%,茎秆中的钾占总量的36.33%。     

冬冷夏热地区住宅建筑室外空间节能设计

从建筑朝向、间距、建筑群组团布局等方面探讨了冬冷夏热地区住宅建筑节能问题。     

Why does onlyAthalia Japonica enter summer diapause among three sympatricAthalia sawflies feeding on crucifers?

Summary This report assesses the primary factor for the evolution of summer diapause of the three species of sawfly,Athalia japonica, A. rosae andA. infumata that feed on cruciferous plants and coexist in the same area.A. japonica has two discrete spring and autumn generations, butA. rosae andA. infumata 5–6 generations. OnlyA. japonica enters summer diapause in response to the long daylengths in spring. Although these three sawflies usually feed on the same cultivated crucifers, they differ markedly in the utilization of wild crucifers. They oviposit only on young leaves.A. japonica mainly usesCardamine plants which sprout in spring and autumn.A. rosae andA. infumata primarily use hosts with new leaves all the year round, i.e. cultivated crucifers andRorippa indica, respectively. The thermal threshold for development is lower inA. japonica than in the other two species. The low heat tolerance ofA. japonica is adapted only to cool shady habitats whereCardamine grows. Presumably, summer diapause ofA. japonica is adaptation to the deterioration of the primary host plants rather than unfavorable climatic conditions. This interpretation is supported by the movement patterns of the threeAthalia sawflies, alternative means to escape from deteriorated habitat conditions.     

吉林省玉米深加工产品营销环境分析

以玉米为主的深加工业已成为吉林省经济发展支柱产业,在发展中还存在着加工转化率低、加工产品品种少等主要问题。本文独辟蹊径从营销战略角度探寻解决问题思路,首先从政策法规、技术人才、玉米供需、深加工产品需求、企业竞争及企业营销等方面对吉林省玉米深加工业营销环境进行深入分析,然后根据营销中的优势、劣势,结合吉林省深加工行业特点、企业现状,最后从细分市场、目标市场选择、品牌方面提出营销战略。     

大学生暑期社会实践创新模式探析———以成都理工大学为例

当前大学生暑期社会实践活动还存在着实践活动与所学专业结合不够紧密,实践活动流于形式,走过场现象较为严重。实践活动在形式和内容上针对性、实效性较差,实践活动重"精英",轻普及,实践活动"运动模式"的缺陷等问题,直接影响到社会实践活动自我教育和服务社会目的的实现。成都理工大学通过多年的积极探索和丰富的实践经验积累,摸索总结出了一套较为有效的大学生暑期社会实践创新模式,即坚持"专业依托"、"广泛参与"、"长效机制"三项原则,运用"基层调研"、"志愿服务"、"素质拓展"三种形式和采取"结合课题"、"双向宣讲"、"项目化管理"三种方法的"三个三"运作模式。