作用区

Based on the elastic theory of large deflection and by taking into account the variation of the axial force and its effects on bending deformation of the drillstring in vertical section ,the vibration of the drillstring induced by fluctuating weight on bit is described by a parametrically excited system.

基于弹性大变形理论，考虑到轴力沿钻柱轴线的变化及其对钻柱弯曲变形的影响等因素，将受自重作用的铅垂井段钻柱在波动钻压激励下的振动转化为一个参数激励系统，用 Galerkin方法首次得到了描述此系统的 Mathieu方程，并通过将方程的解展成富里叶级数的方法，得到了该振动系统的动力分岔值曲线及其所包围的动力不稳定区。

The morphologies of structural changes in the two inorganic silicon materials have been investigated by means of charge coupled device camera and scanning electron microscopy.

对这两种无机硅材料在飞秒脉冲作用后的微区结构改变进行了扫描电子显微镜测试，研究了其形貌特征。

Problems such as unimplemented construction plans, lowquality construction and poor sanitary conditions in rural roads are found in the course of investigation and research in 26 villages of 20 towns and townships of Baota District, Yanan City. These are because of the weak economic basis on the one hand and the poor administration work in construction planning on the other.

近十多年来，延安市宝塔区的村镇建设，特别是农民住宅、公共建筑和生产建筑的建设基本上适应了农村改革、开放的需要，这对调整农村产业结构、发展商品经济、改善农民的居住条件起到了重要的促进作用，并取得了一定的成绩，积累了丰富的经验。

Under the action of expansion of linear structure of the north fringe of Huiquanzhan dome shaped bulge of archaeozoic era in high metamorphic area,the rift greenstone belt was produced.

在高级变质区太古宙会全栈穹形隆起北缘的线性构造扩张作用下，产生裂谷型绿岩带。

Different from cold cathode glow discharge, the avalanche process is not only determined by electron collision induced ionization, the deionization process also plays a decisive role due to the high electron and ion density under high gas pressure and large discharge current.

与常规辉光放电不同的是，阴极区中的巨浪增益不仅仅是由电子碰撞电离过程决定的，而且由于高压强、大电流条件下电子和离子的浓度高，电子空间复合过程也起着决定性作用。

Mantle metasomatism as a precursory event is manifested more obviously for -Cenozoic diwa regions in North China, East African Rift, Rhine Graben, Central Massif of France and East Australia.

地幔交代作用作为地台活化的先驱事件在中国华北、东非裂谷、莱茵地堑、法国中央地块、澳大利亚东部等-新生代地洼区显示得更为清楚。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。