尖端作用

Since porosity subject to heaving stress when saturated clay is freezing,grows brachy-axis is expanded,and yield point appears in micro-axis tip of porosity. As a result,area of porosity dramatically aggrandizes.

封闭系统中饱和冻结粘土冻胀过程中，孔隙受到冻胀力的作用使得孔隙长轴扩展、短轴膨胀，长轴尖端屈服，致使孔隙的面积增大。

When sending an even electric current down the plate vertical to the crack line, the electric current was detoured near the crack tips for the existing of cracks and Joule heats was produced. The instantaneous high temperature formed the point heat source.

在通入垂直于裂纹的均匀电流作用下，由于裂纹的存在，裂纹尖端出现绕流现象，产生焦耳热，瞬时高温形成点热源。

The stress intensity factors of surface crack with various inclined angle subjected to normal and shear contact loadings are obtained.

文中算例分析了不同倾角的表面裂纹在法向和切向接触载荷作用下，裂纹尖端的应力强度因子。

According to the rate being a fixed value of perspective line at two points on the same way,a perspective instrument has been designed. It consisted of three gear boards with pin shape at the two ends. The three boards were connected by feather joint and could turn at the action of force. They could not turn when stop at any position.

根据透视线在同一方向上两对应点间的距离之比为定值的结论而设计的透视规，是由3片两端带有针状尖端的长条板而构成，相互用铰链相连。3片长条板在一定力的作用下可绕铰链旋转，但停于任一位置后不会轻易转动。

ABSTRACT Based on the existing damage model of rock blasting and the theory of rock damage and fracture, a new damage model for rock blasting, a gas-driven fracture propagation and damage localization at the crack tip model during explosion products are proposed.

在分析研究现有岩石爆破损伤模型和岩石损伤断裂理论的基础上，建立了一个新的岩石爆破损伤模型和岩石在爆生气体作用下的裂纹扩展及裂纹尖端损伤局。。。

English Outline A one-term introductory biochemistry course that covers the biochemistry of the living state; the chemistry of amino acids, proteins, nucleic acids, carbohydrates, lipids, and steroids; energy transformations and chemical reactions in living cells; action of hormones; and self-regulation and self-replication of living organisms.

Chinese Outline 本课程属於生物技术的基础课程，授课内容强调基本生化原理，介绍细胞组成份〈包括核酸、蛋白质、醣类和脂质〉的化学、生物活性及代谢，并分别阐明代谢作用与基因表现的调节机转，辅以现今生化尖端学术研究的介绍，希望能以一学期的紧密课程，让学生了解现代生化科技领域的轮廓，作为日后深造或从事生化科技行业的奠基。

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。