排序方式: 共有27条查询结果,搜索用时 31 毫秒
1.
本文分析了预应力混凝土有限长圆管的弹性压缩损失,推导出一个公式概括了等配筋率和沿管长呈线性变化的变配筋率情况位移的计算,从而得到有效预压力的实用计算法,改正了苏联巴依柯夫的有限长圆管变配筋率情况有效预压力计算法的错误。概念清晰,方法简便,易为工程技术人员所掌握。 相似文献
2.
3.
4.
5.
6.
7.
We have studied the confined phonons in GaAs/Al0 3Ga0.7As superlat-tice grown by molecular beam epitaxy on oriented and misoriented GaAs (001) substrates. Raman scattering measurements have been performed at room- and low-temperatures. The results show that the phonon features in the superlattice-grown on GaAs(001) misoriented 4° toward the [110] direction are significantly different from those in the precisely oriented sample. The difference is discussed in terms of misorientation induced atomic-steps at GaAs-Al0.3Ga0.7As interfaces. 相似文献
8.
9.
10.
对于在扫描近场光学显微镜基础上发展起来的近场光谱仪的设计原理、基本结构和具体设计作了较具体的讨论,同时,也简要介绍了近场光谱学。 相似文献