接触面

The conventional onesided travelling-wave ultrasonic motor needs bearing to support and oil to lubricate, does provide sufficiently high torque and power due to limited contact area between the stator and the rotor, consequently its application is limited.

针对传统的行波超声电机定转子接触面小、输出力矩小，需要轴承定位，存在润滑问题，设计了一种新型双锥面齿驱动的自支撑轴系行波超声电机。

In the cylindrical coordinates, the related basic formula and solve method of the equivalent boundary element method were established and derived, and a new contact element was introduced to model the hybrid of structure and soil.

同时建立并推导了在柱体坐标系下插入式大圆柱壳墩式结构的等效边界元数值分析的相关基本方程和求解方法，并提出了一种新的接触面单元以模拟结构和土体间不同材料的耦合关系。

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。