4.1 Ga old detrital zircon in western Tibet of China

4.1 Ga old detrital zircon was found by SHRIMP U-Pb dating for quartz schist from Buring County in western Tibet, Southwest China. This is the oldest zircon U-Pb age found in China so far. The detrital zircon is a zircon of magmatic origin because its Th/ U ratios are 0.76 to 0.86. Two dates older than 4.0 Ga were measured only in one grain. U-Pb ages of 35 measured spots in 24 zircons can be subdivided into 6 groups, corresponding to at least 6 episodes of magmatic activity in the target area. The present results provide an important geochronological constraint on the geological evolution of Qinghai-Tibet Plateau.     

西藏古建筑中装饰织物的燃烧特性研究

利用不同火源对20种西藏古建筑中典型装饰织物和4种纯涤、纯棉和涤棉织物进行了燃烧试验,研究了其燃烧行为;利用极限氧指数(limiting oxygen index,LOI)和垂直燃烧(vertical burning,VB)方法对这20种织物的燃烧性能进行了测试,判定了燃烧级别,分析了材质的影响,并对4种纯涤、纯棉和涤棉织物分别在拉萨和合肥同期进行了LOI和VB对比测试,探讨西藏高原环境对装饰织物燃烧性能的影响;利用锥形量热标准化测试研究了部分代表性织物的对火反应特性,分析了材质、厚度等织物属性的影响.结果表明,西藏古建筑内大部分装饰织物为易燃可燃物(LOI≤20),材质以丝质天然纤维和纤维素纤维为主,遇火后即发生复杂明火燃烧现象;西藏低氧低压条件已能充分支持织物的实尺度燃烧,虽织物燃烧速率降低,燃烧时间加长,但局部燃烧加剧,火焰体积加大,具有较大的火灾危险性;纤维素织物热释放速率普遍高于以动物毛绒或丝质材料为主体成分的织物,且织物厚度越大、组织越致密、结构越复杂,热释放速率往往越大.     

西藏高校心理健康教育现状的若干思考

大力发展高校心理健康教育是中国高校共同的目标,西藏高校心理健康教育方面几乎是空白,要在一穷二白的状况下发展西藏高校心理健康教育,就要全面考虑西藏与内地(西藏地区生活的人们对西藏以外地区的通俗称谓,下同)的差异、西藏心理健康教育的特殊性、如何构建合理的西藏高校心理健康教育体系和制定合理的可行的发展规划。     

西藏冰川在急速融化

据德国《DIE WELT》2006年12月2日报道,世界上三分之一的人口,依赖发源于喜马拉雅山高原地区的饮用水。然而,西藏冰川却在迅速融化。     

凝练科研方向,提高西藏大学科研竞争力

文章就凝练我校科研方向方面作了探讨,认为西藏大学的科研方向应以西藏的经济、社会发展需要为突破口,应与西藏未来科技发展战略及支柱产业的发展紧密结合;凝炼科研方向的关键是选拔和培养科研带头人.     

Diversity of Plant Species of Alpine Grassland in Nakchu of Tibet, China

0Introduction Biologicaldiversityconcernedwiththesumofvariouslivingbeingsandtheirprocesses,aswellasthebasisofharmonious coexistencebetweenmanandnatureplaysanimportantroleinecology,economy,esthetics,ethics,etc.Duetodeteriorationofglobal environment,acceler…     

Isotopic composition of atmospheric water vapor before and after the monsoon’s end in the Nagqu River Basin

Atmospheric water vapor samples were collected in the Nagqu River Basin in the middle of Tibetan Plateau between August and October in 2004. Results show that there exist some fluctuations of the δ^18O of atmospheric water vapor, especially before and after the monsoon＇s end.Moreover, the variety trend of the δ^18O of atmospheric water vapor inverse correlates with that of dew point. Precipitation events make an important effect upon the variation of δ^18O of atmospheric water vapor. During the whole sampling period, the δ^18O values of atmospheric water vapor are low while precipitation events occurred. The moisture origins w also contribute to the variation of δ^18O of atmospheric water vapor. The oceanic moisture transported by the southwest monsoon results in lower δ^18O of atmospheric water vapor in the Nagqu River Basin. Compared with the influence of the oceanic moisture, the δ^18O values, however, appear high resuiting from the effect of the continental air mass in this region.     

Ecological Carrying Capacity of Tibet China——Variety of Ecological Footprints from 1978 to 2002

Ecological footprint‘ s theory and method are used to calculate and analysis the ecological carrying capacity in Tibet. The results indicate: Tibet ecological footprint (2.1 hm^2) keeps higher than countrywide average level( 1.5hm^2 ), and lower than global average level (2.4hm^2 ) the result show that Tibet pasture ecological footprint is the most different with other area, and woodland is the second; Tibet ecological footprint grows from 1. 25 hm2 in 1978 to 2.09 hm^2 in 2002, which states that life level is improvingcontinuously; GDP (per RMB 104 Yuan) ecological footprint reduces from 61.9 hm2 in 1978 to 4.54 hm^2 in 2002, which states resources utilized ratio is increasing continuously.     

发展生态产业实现西藏牧区经济的可持续发展

经济发展缓慢、草原生态环境的急剧退化，是当前我国西部少数民族牧区普遍存在的两大问题。对此深入研究，具有重大理论意义和实践意义。章试图结合西藏牧区的实际，探讨保护草原生态环境与加快牧区经济发展有机结合的草原牧区可持续发展的道路。     

雍正朝治藏政策探析

雍正朝基本上继承了康熙末年的治藏政策，在推行政教分离制扶持西藏地方世俗贵族掌政方面保持了延续性。雍正帝借平定罗卜藏丹津叛乱之机，取得了对西藏外围地区的直接控制权，为加强对西藏地区的直接统治奠定了坚实的基础。随后，为了应对不断变化的西藏局势，雍正一朝又在很大程度上对原有政策进行了调整，从而把清朝的治藏事业不断地推向了前进。在以往的有关清朝治藏政策的研究中，对雍正时期的治藏政策多有涉及，但缺乏对雍正朝治藏政策的深入探讨和整体把握。