3－1 凸轮机构的应用和类型 3－2 从动件的常用运动规律 3－3 凸轮机构的压力角 3－4 图解法设计凸轮的轮廓 3－5 解析法设计凸轮的轮廓

定义1设a1,a2,…,am,β是一组n维 向量,若存在m个实数k1,k2,…km使得 β=ka1+k2a2++kmam,则称β可以 由a1,a2,…,an线性表示( linear representation).或称a1,a2,…,an线性 表示(linear generate) 例如:a1=(1,2,0)T,a2=(1,0,3)T,a3= (3,4,3)T,则a3=2a1+a2,即存在实数k =2,k2=1使得a3=ka1+k2a2,故a3可以 由a1,a2线性表示。(大家想一想,这里的常 数k1=2,k2=1是怎么求出来的?)

对CSP生产的700 MPa级高强钢板卷上表面氧化层进行了研究.发现钢卷沿卷长方向头部、中部氧化层主要由Fe+Fe3O4共析组织构成,而尾部则主要由Fe2O3层和Fe3O4层双层组织构成.沿板宽方向,边部的氧化层较厚,离边部越远,氧化层越薄.从边部到板宽中心,Fe2O3层和Fe3O4层的比例逐渐减少,Fe+Fe3O4共析组织逐渐增加,到距边部300 mm时氧化层几乎全部由Fe+Fe3O4共析组织构成.相较于CSP生产的SPHC钢,前者氧化层厚度对板卷厚度变化不太敏感

3-1机构运动分析的目的与方法 3-2速度瞬心及其在机构速度分析中的应用 3-3用矢量方程图解法作机构速度和加速度分析 3-4综合运用瞬心法和矢量方程图解法对复杂机构进行速度分析 3-5用解析法作机构的运动分析

The difference betWeen the systems of CaO-SiO2-H2O and CaO-SiO2-Al(OH)3-H2O, was studied,especially the effect of Al3+ on the crystallinity of tobermorite was focussed. As a result, in the system of CaO-SiO2-H2O, tobermorite formed early, howevey, with reaction time forward, tobermorite was replaced by xonotlite. So far as CaO-SiO2-Al(OH)3-H2O was concemed, hydrothermal reaction was carried out under the same condition as CaO-SiO2-H2O to study the morphological changes of tobermorite crystals. It was found that Al3+ accelerated the crystal growth of tobermorite to some extent and was in favor of platy crystals. Moreover, with the Al3+ content increasing in the starting material, the morphology of tobermorite did not change magnificently, but platy crystals became more and more eminent. As soon as the Al2O3