太原市发展屋顶绿化应注意的若干问题

屋顶绿化是我国城市建设的一个崭新亮点，它既有增加城市绿地面积、发挥生态林业的作用，又有美化城市、为居民提供活动场所的功能。简要介绍了国内外屋顶绿化的发展状况，分析了太原市发展屋顶绿化的技术难点，提出了地毯式、花槽连网架式、花园式3种屋顶绿化模式，并建议就不同模式进行试点。     

浅析太原市森林火灾发生规律及防治对策

通过对近年来太原市森林火灾统计资料和森林防火工作基本形势的分析，提出影响林火的5大气象要素，揭示森林火灾发生的客观规律，进一步明确指出森林防火工作必须加大宣传教育力度、加强火源管理、创新激励机制、强化行政领导负责制、加大防火科技含量，以确保森林资源安全。     

Google浏览器如何经营中国市场——百度、UC、360、QQ浏览器为什么让人感觉比Chrome好

Google浏览器技术具有创新性,不仅满足了Google的企业的发展需求,也符合广大用户的信息要求,但是如何进入中国市场,是个值得深思的问题。     

South-polar features on Venus similar to those near the north pole

Venus has no seasons, slow rotation and a very massive atmosphere, which is mainly carbon dioxide with clouds primarily of sulphuric acid droplets. Infrared observations by previous missions to Venus revealed a bright 'dipole' feature surrounded by a cold 'collar' at its north pole. The polar dipole is a 'double-eye' feature at the centre of a vast vortex that rotates around the pole, and is possibly associated with rapid downwelling. The polar cold collar is a wide, shallow river of cold air that circulates around the polar vortex. One outstanding question has been whether the global circulation was symmetric, such that a dipole feature existed at the south pole. Here we report observations of Venus' south-polar region, where we have seen clouds with morphology much like those around the north pole, but rotating somewhat faster than the northern dipole. The vortex may extend down to the lower cloud layers that lie at about 50 km height and perhaps deeper. The spectroscopic properties of the clouds around the south pole are compatible with a sulphuric acid composition.     

Importance of rain evaporation and continental convection in the tropical water cycle

Atmospheric moisture cycling is an important aspect of the Earth's climate system, yet the processes determining atmospheric humidity are poorly understood. For example, direct evaporation of rain contributes significantly to the heat and moisture budgets of clouds, but few observations of these processes are available. Similarly, the relative contributions to atmospheric moisture over land from local evaporation and humidity from oceanic sources are uncertain. Lighter isotopes of water vapour preferentially evaporate whereas heavier isotopes preferentially condense and the isotopic composition of ocean water is known. Here we use this information combined with global measurements of the isotopic composition of tropospheric water vapour from the Tropospheric Emission Spectrometer (TES) aboard the Aura spacecraft, to investigate aspects of the atmospheric hydrological cycle that are not well constrained by observations of precipitation or atmospheric vapour content. Our measurements of the isotopic composition of water vapour near tropical clouds suggest that rainfall evaporation contributes significantly to lower troposphere humidity, with typically 20% and up to 50% of rainfall evaporating near convective clouds. Over the tropical continents the isotopic signature of tropospheric water vapour differs significantly from that of precipitation, suggesting that convection of vapour from both oceanic sources and evapotranspiration are the dominant moisture sources. Our measurements allow an assessment of the intensity of the present hydrological cycle and will help identify any future changes as they occur.     

ITER中国液态锂铅实验回路中的氚技术

多方合作的国际热核实验堆(ITER)计划是全球能源问题关注的一个重要进展标志,中国参与提出的双功能液态锂铅包层模块(DFLL-TBM)是一重要组成部分,采用液态锂铅合金作为氚增殖剂和冷却剂,氢-氦混合气鼓泡方式提取氚.因此,氚技术成为关系液态金属包层成败的关键问题之一.结合中国液态锂铅实验包层技术的发展战略,从理论分析与计算、实验研究和工程设计3方面,阐述了自2004年以来ITER中国液态锂铅回路中的氚技术研究进展.系统介绍了液态锂铅鼓泡器的模拟-设计与研制、锂铅回路中氚的衡算-分析与防氚渗透涂层的进展、锂铅材料辐照-释氚行为的计算与实验、包层氚提取系统的设计等情况.这些工作结果表明,彻底克服锂铅中氚溶解度极低、长期连续操作、磁流体效应(MHD)累积、材料腐蚀等困难,解决氚的滞留、渗透与回收技术难题,降低环境污染是完全可行的.     

对少年长跑运动员高原训练期间生理生化指标规律探究

随着竞技体育的发展,每个竞技项目的科技含量越来越高,势必要求业余体育训练也要进行科学训练。采用实验法、文献资料法和逻辑分析法,针对青少年长跑运动员的特点,运用科学监控手段与科学训练方法有机结合,进行深入的实践和研究,达到提高运动成绩的效果。     

川南古宋煤矿区阳新统深岩溶水系的电网络模拟研究

本文以古宋矿区26个钻孔的水位资料、泉点及河流漏失量调查资料为依据,通过电网络模拟作出研究区地下水模拟等水位线图。并根据模拟中的调试情况,对地下水流动的水动力条件作了分析。结合地质解释,阐述了本区特殊的越流型深部岩溶管道水系的形成和它所经历的三个阶段。     

目前我国农民思想状况的分析

我国农民经过近２０年的改革开放，对文化价值的评价与现实的矛盾，对农村发展的信心与个人能力之间的矛盾、对村领导人评价的心态矛盾等正在经过分化和消融，从而使现代化思想观念日益增强。我国农村基层民主制度建设的过程实质上是一个思想解放的过程     

西安市专业人才队伍的现状及发展思路

近年来,西安市专业人才队伍有了一定的发展,但人才观念滞后、人才结构失调、人才体制不成熟、人才环境欠佳、人才队伍不稳,制约了队伍的建设.为加快专业人才队伍建设,促进西安社会经济发展,我们应进一步营造重科学、重人才的社会氛围,加强对人才队伍建设的领导管理,建立完善各种激励机制与政策,加大对人才的培养、选拔和使用,改善工作生活环境,搞好人才立法,吸引更多的专业人才投入经济建设主战场.