甘糖酯对大鼠尿激酶型纤溶酶原激活物活性的诱导作用

为了研究甘糖酯对大鼠体内尿激酶型纤溶酶原激活物 (urokinase PlasminogenActivator,u PA)活性的影响 ,采用溶解圈中和抑制法和发色底物法检测了大鼠口服甘糖酯后体内u PA活性的变化情况。结果表明 :甘糖酯可提高大鼠体内血液的纤溶活性 ,主要表现为 u PA活性升高。以不同剂量的甘糖酯连续喂药 10 d后 ,发现喂药组大鼠 u PA活性明显高于对照组 ,喂药组大鼠血浆 u PA活性升高同喂药剂量正相关 ,在 0～ 10 0 mg/ kg的剂量范围内 ,随喂药剂量增加而升高。提示在一定的剂量范围内甘糖酯可提高大鼠体内 u PA活性 ,激活纤溶系统 ,提高血液纤溶活性 ,表现出良好的抗栓作用     

军事地理信息系统在数字化战场中的应用

介绍了军事地理信息系统的概念并对其应用领域进行了分类,分析了军事地理信息系统在国外军事领域的应用,展望了我军发展军事地理信息系统和建设数字化战场的前景.     

Climate change in Mt. Qomolangma region since 1971

Using monthly average, maximum, minimum air temperature and monthly precipitation data from 5 weather stations in Mt. Qomolangma region in China from 1971 to 2004, climatic linear trend, moving average, low-pass filter and accumulated variance analysis methods, the spatial and temporal patterns of the climatic change in this region were analyzed. The main findings can be summarized as follows: (1) There is obvious ascending tendency for the interannual change of air temperature in Mt. Qomolangma region and the ascending tendency of Tingri, the highest station, is the most significant. The rate of increasing air temperature is 0.234 oC/decade in Mt. Qomolangma region, 0.302 oC/decade in Tingri. The air temperature increases more strongly in non-growing season. (2) Compared with China and the global average, the warming of Mt. Qomolangma region occurred early. The linear rates of temperature increase in Mt. Qomolangma region exceed those for China and the global average in the same period. This is attributed to the sensitivity of mountainous regions to climate change. (3) The southern and northern parts of Mt. Qomolangma region are quite different in precipitation changes. Stations in the northern part show increasing trends but are not statistically significant. Nyalam in the southern part shows a decreasing trend and the sudden decreasing of precipitation occurred in the early 1990s. (4) Compared with the previous studies, we find that the warming of Mt. Qomolangma high-elevation region is most significant in China in the same period. The highest automatic meteorological comprehensive observation station in the world set up at the base camp of Mt. Qomolangma with a height of 5032 m a.s.l will play an important role in monitoring the global climate change.     

ANALYSIS OF COMPOSITE DIAGNOSIS OF OCEANIC EXPLOSIVE CYCLONES*

Using the data of ECMWF (European Center for Medium-range Weather Forecasts) to undertake composite diagnoses of 16 explosive cyclones occurring at the Atlantic and the Pacific Oceans,it is found that there are a lot of obvious discrepancies on the basic fields between these strong and weak explosive cyclones.The major reasons why the explosive cyclones over the Atlantic are stronger than those over the Pacific Ocean are that the non-zonal upper jet and the low-level warm moist flow over the Atlantic are stronger.The non-zonal upper jet offers stronger divergence,baroclinicity and baroclinic instability fields for explosive cyclones.Anticyclonic curvature at the high level of strong explosive cyclones is easy to make the inertia-gravitational wave developing at the moment of northward transfer of energy and stimulate the cyclones deepening quickly.Warm advection and diabatic heating can cause the upper isobaric surface lifting,as a result,the anticyclone curvature of cyclones enlarges,and wave energy develops easily as well.The most powerful period of the development of explosive cyclones is just the time when the positive vorticity advection center is located over the low vortex.At the upper level,when the distribution of potential vorticity contours changes suddenly from rareness to denseness,and the large values of the potential vorticity both in the west and north sides of cyclones extend downwards together,then cyclones are easy to explosively develop.The formation of strong explosive cyclones is closely related with the non-zonality of upper jet and the anticyclonic curvature.     

新媒体时代基于政务微博新平台建设服务型政府浅议

作为社会化媒体的重要类型,微博已经成为继新闻网站、论坛、博客之后,网络舆论生成的主要载体,＂微博问政＂成为热点和趋势,政务微博也成为政府信息公开、发布权威信息、提供公共服务、加强政民互动、引导网络舆论的重要平台。随着政务微博的快速发展,一系列新问题、新挑战也逐步显现。本文结合国土资源部政务微博的现状,就如何使用政务微博为民服务,提高政务微博应用水平,促进政务微博的健康发展,提升政府公信力,提出了对策建议。     

永久散射体干涉测量技术在首都机场的应用

采用永久散射体干涉测量技术,结合2003—2009年间28幅Enviast卫星的ASAR影像,分两次监测首都机场地面沉降情况。试验结果表明,首都机场及其附近区域存在着地表形变。在监测的时间区间内,T1、T2航站楼有下降趋势,年均形变量约为10 mm;T3航站楼有上升趋势,且呈现出不均匀状态。     

Kinetic Characteristics of CH4 Adsorption on Coals under Variable Temperature–Pressure Coupling Interaction

Natural Resources Research - The accurate determination of coalbed methane (CBM) content is of great significance for its development and utilization as well as for the prevention and control of...     

城市公共交通GIS查询系统设计与开发

针对城市道路建设和交通基础设施建设以及传统公交查询技术对公交数据管理存在数据冗余的问题,该文提出了基于动态分段技术和采用空间数据库引擎来组织和管理公交数据的方法。以兰州市城市公共交通为研究对象,并结合ArcGIS Engine组件库,设计并开发符合大众使用习惯的城市公共交通GIS查询系统。实验结果表明:该系统不仅可以规划合理的可视化出行路线来满足乘客需要,而且有效减少了公交数据的冗余度。     

非传统稳定同位素分析技术要点

高精度高质量的同位素分析技术是开展非传统稳定同位素地球化学工作的前提。同位素分析是不断提取样品真实信息的过程,包括样品制备、化学分离、质谱测定和数据处理4个基本步骤。在同位素分析过程中,每一环节都有可能引入空白或者污染,或造成同位素分馏,引发信息“失真”。为了准确获得样品的真实同位素组成,必须有效避免污染并精准校正在分析过程中可能的干扰。以Ca同位素为例,在总结前人工作的基础上,探讨了各个步骤所涉及的分析要点,为建立其他同位素体系的分析方法提供参考,为后续储库探讨、机理解析及应用研究提供技术支撑。