variable adj. 1.易变的,变化无常的,无定的 (opp. constant, steady)。 2.可变的,能变的;变换的。 3.【数学】变量的;【天文学】变光的;【生物学】变异的。 Prices are variable according to the exchanges. 物价跟着汇率变动。 a man of variable character 反复无常的人。 a rod of variable length (伸缩)如意棒。 a word of variable construction 可以作种种解释的词。 variable capital 可变资本。 a variable budget 临时预算。 n. 1.易变的东西。 2.【数学】变量,变数,变项,变元 (opp. constant);【天文学】变星 (=variable star);【航海】(方向不定的)变风,不定风 (opp. trade wind); 〔pl.〕 (贸易风带中的)变风带。 adv. -ably ,-ness n.
We conclude this section with two examples of motion under the action of a variable force . 下面我们举两个关于物体在变力作用下运动的例子来结束这一节。
Parametric active contour model to deal with automatic segmentation of weak edge medical image . based upon analyzing balloon force model , a minimum variation snake model is proposed and successfully applied to segmentation of weak edge medical image . in the model , variable force incorporating the information of foreground and background regions replaces constant force in the balloon snake model 高斯力和气球力等传统的参数活动轮廓模型难以处理弱边界医学图像自动分割问题,在气球力snake模型基础上,提出最小方差snake模型,该模型将气球力snake模型中的恒定气球力修改为包含区域信息的变力,以目标和背景两区域具有最小方差为准则,引导轮廓曲线运动。
The model has taken in account the following factors : hydrodynamic forces and moments acting on the hull , propeller and rudder of the vessel , and the hydrodynamic interaction among them ; the characteristics of the maneuverability in shallow water and in low speed ; the variable forces and moments acting on the tugboat 分别考虑了船体、桨和舵上的力及力矩,以及三者相互之间的干涉;充分考虑了港内操纵浅水和低速两个特点;考虑了拖轮桨推力、受到的流体动力以及大船与拖轮之间的相互作用力三者之间的关系。