弹石

On the basis of contact mechanics, the expression of restitution coefficient, which the elastic-plastic deformation of earth is considered, is presented in this paper.

利用接触力学弹塑性碰撞理论，推导了考虑了落石与地面碰撞弹塑性变形的恢复系数计算公式。

Base on the elastic-plastic contact theories, the calculation model of restitution coefficient both in normal and tangential impacting direction are studied.

本文将以弹塑性接触理论为基础，研究了滚石法向恢复系数、切向恢复系数的计算方法，运用运动学的基本方程研究了滚石在坡面上的运动特征，推导了相关的公式。

Considering the gel layer and the endolymph of otolith organs as visco-elastic solid and fluid respectively, the Grant′s elastic model was modified.

将耳石器官的胶质层和内淋巴液分别作为粘弹性固体和流体处理，修改了Grant等人所提出的模型，通过频率分析，给出了耳石器官物性参数以及粘弹特性对于系统的不同控制作用。

Trebuchet: A medieval catapult for hurling heavy stones.

中世纪的一种用于投掷重型石弹的投石机。

The Roman ballista was powered by torsion derived from two thick skeins of twisted cords through which were thrust two separate arm s joined at their ends by the cord that propelled the missile.

希腊投石机基本上为一绑在基座之巨大的弩；罗马投石机使用绞扭力发射，以两束粗大绞索将强力弹臂之两端绞至并拢，然后弹射投掷物。

The Roman ballista was powered by torsion derived from two thick skeins of twisted cords through which were thrust two separate arms joined at their ends by the cord that propelled the missile.

希腊投石机基本上为一绑在基座之巨大的弩；罗马投石机使用绞扭力发射，以两束粗大绞索将强力弹臂之两端绞至并拢，然后弹射投掷物。

The Roman ballista was powered by torsion derived from two thick skeins of twisted cords through which were thrust two separate arms joined at their ends by the cord that propel led the missile.

希腊投石机基本上为一绑在基座之巨大的弩；罗马投石机使用绞扭力发射，以两束粗大绞索将强力弹臂之两端绞至并拢，然后弹射投掷物。

The Roman ballista was powered by torsion derived from two thick skeins of twist ed cords through which were thrust two separate arms joined at their ends by the cord that propelled the missile.

希腊投石机基本上为一绑在基座之巨大的弩；罗马投石机使用绞扭力发射，以两束粗大绞索将强力弹臂之两端绞至并拢，然后弹射投掷物。

And Ozias prepared for them, that is, for the whole army, shields, and spears, and helmets, and coats of mail, and bows, and slings to cast stones.

乌齐雅给他们全队的人配备了盾牌、长枪、盔甲、弓箭和弹石。

When the men of the city saw them, they seized their weapons and ran out of the city to the crest of the ridge; and all the slingers blocked the ascent of Holofernes' servants by hurling stones upon them.

那在山顶城中的人一见他们就拿起武器，由山顶的城出来，同时所有的弹石射手，向他们抛石，挡住他们上来的路。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。