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Longmen Mountain Which Lies between Yangtze terrain and Song- pan-Ganzi fold zone is a typical foreland fold-thrust belt, It was formed by the collision of Tethys in Indosinian movement. The belt can be devided into three zones due to the difference in stratig- raphy, deformation and metamorphism, i. e. Similar fold-ductile shea- ring zone, Concentric fold-imbricate thrust zone and gentle fold zone. The structural styles in this area is typical and can be com- pared with the structures in other typical fold-thrusts... Longmen Mountain Which Lies between Yangtze terrain and Song- pan-Ganzi fold zone is a typical foreland fold-thrust belt, It was formed by the collision of Tethys in Indosinian movement. The belt can be devided into three zones due to the difference in stratig- raphy, deformation and metamorphism, i. e. Similar fold-ductile shea- ring zone, Concentric fold-imbricate thrust zone and gentle fold zone. The structural styles in this area is typical and can be com- pared with the structures in other typical fold-thrusts belt in the world. using the technique of balanced cross section, we calculate that the shortening of the belt is about 60%~70%, it has been proved to be correct by the seismic exploration, 褶皱—冲断带的研究对于揭示地球演化历史及指导油气勘探具有重要的理论意义和实际意义。本文以龙门山构造带为例,从几何分析入手,对该构造带的区域地质背景、构造变形特征及形成机制进行了探讨。研究表明,龙门山构造带是特提斯构造演化的产物,属于典型的前陆褶皱—冲断带,其变形特征可与世界典型的造山带进行对比。 Based on the retrospects and existing problems of balanced fertilization in Jiangxi province, a few countermeasures on the application of balanced fertilization were put forward in this paper. First, the demand for chemical fertilizer and the proper proportions of nitrogen, phosphorus, and potassium by the end of this century were expected. Second, attention should be paid to the role of middle- and micro-nutrients in balanced fertilization. Third, organic resources should be made full use... Based on the retrospects and existing problems of balanced fertilization in Jiangxi province, a few countermeasures on the application of balanced fertilization were put forward in this paper. First, the demand for chemical fertilizer and the proper proportions of nitrogen, phosphorus, and potassium by the end of this century were expected. Second, attention should be paid to the role of middle- and micro-nutrients in balanced fertilization. Third, organic resources should be made full use of. Fourth, the development and application of bulk blend fertilizer, which is a materialized technique of balanced fertilization, should be sped up. Finally, legislation and administration on the production and marketing of chemical fertilizer should be strenghened. 本文从江西省平衡施肥发展过程的回顾以及当前实行平衡施肥存在的问题出发,提出今后平衡施肥的对策:1.到本世纪末氮、磷、钾化肥需求量及其适宜比例;2.微量和中量营养元素在平衡施肥中值得重视;3.充分利用有机肥源;4.大力发展和应用配方施肥的物化技术作物专用BB肥;5.加快化肥立法,加强化肥市场管理 A generated technique of balanced light intensity and high efficiency multiple ban splitting beams element using synthetical phase gratings. In this paper, a generated method of 2-D binary phase grating by chemistry etching is presented. 采用组合位相光栅技术,制作光强分布均匀、衍射效率较高的多光束分光元件。本文介绍用化学蚀刻的方法制作二维二元位相光栅.
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