足球运动员专项体能生理机能评定与应用分析

对于足球运动员体能训练的负荷强度和运动量的掌握一直以来都在困扰着广大教练员,如何准确掌握足球运动中身体机能变化的特点,合理、有效地组织和安排专项体能训练活动,提高科学性,减少盲目性,达到理论指导实践,快速有效的提高足球运动员的专项体能水平已成为极为迫切的需要.因此科学、有效、针对性强的机能评定方式和指标的准确测定以及正确分析,对于评价足球运动员的竞技状态和机能水平,科学的调整训练强度,合理安排运动训练负荷,有积极的作用.     

社会力量参与公共图书馆建设探讨

指出公共图书馆要满足社会公众日益增长的精神文化需求,使图书馆服务效益最大化,需要社会各界积极参与,以弥补政府投入图书馆事业的人力、财力之不足。总结社会力量参与图书馆建设的已有模式,探讨社会力量参与图书馆建设的作用,并结合大量实例说明其具体途径,以为相关研究和实践提供借鉴。     

Altered trends in carbon uptake in China's terrestrial ecosystems under the enhanced summer monsoon and warming hiatus

The carbon budgets in terrestrial ecosystems in China are strongly coupled with climate changes. Over the past decade, China has experienced dramatic climate changes characterized by enhanced summer monsoon and decelerated warming. However, the changes in the trends of terrestrial net ecosystem production (NEP) in China under climate changes are not well documented. Here, we used three ecosystem models to simulate the spatiotemporal variations in China''s NEP during 1982–2010 and quantify the contribution of the strengthened summer monsoon and warming hiatus to the NEP variations in four distinct climatic regions of the country. Our results revealed a decadal-scale shift in NEP from a downtrend of –5.95 Tg C/yr² (reduced sink) during 1982–2000 to an uptrend of 14.22 Tg C/yr² (enhanced sink) during 2000–10. This shift was essentially induced by the strengthened summer monsoon, which stimulated carbon uptake, and the warming hiatus, which lessened the decrease in the NEP trend. Compared to the contribution of 56.3% by the climate effect, atmospheric CO₂ concentration and nitrogen deposition had relatively small contributions (8.6 and 11.3%, respectively) to the shift. In conclusion, within the context of the global-warming hiatus, the strengthening of the summer monsoon is a critical climate factor that enhances carbon uptake in China due to the asymmetric response of photosynthesis and respiration. Our study not only revealed the shift in ecosystem carbon sequestration in China in recent decades, but also provides some insight for understanding ecosystem carbon dynamics in other monsoonal areas.     

Rock-salt and helix structures of silver iodides under ambient conditions

Many different phase structures have been discovered for silver iodides. The β and γ phases were found to be the most common ones at ambient conditions, while the rock-salt phase was found to be stable under pressures between 400 MPa and 11.3 GPa. Recently, the α phase was demonstrated to be stable under ambient conditions when the particle sizes were reduced to below 10 nm. However, no other phase has been reported to be stable for silver iodides under ambient conditions. Rock-salt and helix structures have been found to be stable under ambient conditions in this study. The structures have been characterized by elemental mapping, Raman scattering, and high-resolution transmission electron microscopy. The stabilities of these structures were also confirmed by molecular dynamics and density functional theory.     

面向业务流程的信息安全风险评估方法研究

通过对支撑组织业务运转的信息资产所处的位置和流动属性的分析,将传统的GB/T20984-2007中定义的五种主要资产,即数据﹑软件﹑硬件﹑人员和服务划分为位置固定资产与位置变动资产;引入业务流程风险模型以有效识别信息资产所在业务节点面对的风险;应用AHP方法对资产建立风险等级层次模型确定风险的大小,为后续的风险管理活动提供一个科学的风险等级划分依据并通过实例验证本方法的可用性。      

太极拳练习对少儿体质健康影响的研究

以太极拳练习史在1年以上的115名少儿为实验对象,并随机抽取120名没有太极拳练习史的少儿为对照组,观察太极拳练习对少儿体质健康的影响。结果显示,在某些身体素质和身体机能方面差异显著。结果表明,太极拳练习对少儿的体质健康有促进作用。     

"拟剧理论"之于旅游管理应用型人才培养的启示

旅游管理专业毕业生的实际应用能力达不到市场预期的主要原因在于学习过程中学生积极性不够,实践教学效果不佳;从而出现了旅游管理专业毕业生普遍存在眼高手低的现象.拟剧理论将舞台表演的思想引入到社会活动,师生课堂拟剧对于旅游管理应用型人才培养可以起到积极的指导意义.     

广东省旅游区位实证研究——兼析旅游区位重构

基于王瑛、王铮(2000)提出的旅游区位模型,针对广东省国家级高级别A级旅游景区的实际分布,进行实证研究,重新确认广东省的旅游区住带:都市风貌带、特色资源带、旅游滞后带、特色文化与自然风光带,并揭示了经济发达地区迥异于经济欠发达地区的旅游区位特点与原因.文章围绕重构广东省旅游区位,提出两条建议:引进特色主题开发模式,实现旅游资源的组织整合;突破行政区域的界线,打造近距离核心客源市场.     

醛类物质的羰基加成和消去反应

【问题的由来】 苯甲醛是一个基本的有机化工原料,通过它和乙醛在稀碱溶液中的缩合,可以制得肉桂醛系列化合物作为有机反应的重要中间体。它在制取定香剂、驱虫药、光敏高分子材料等方面有广泛的用途。笔者试图通过与苯甲醛有关的内容考查学生的一些能力,如推断同一原料在不同条件下形成的不同结构、完成化学方程式、辨别反应类型等。