排序方式: 共有17条查询结果,搜索用时 15 毫秒
1.
A new method of moving asymptotes for large-scale minimization subject to linear equality constraints is discussed.In this method,linear equality constraints are deleted with null space technique and the descending direction is obtained by solving a convex separable subproblem of moving asymptotes in each iteration. New rules for controlling the asymptotes parameters are designed and the global convergence of the method under some reasonable conditions is established and proved.The numerical results show that the new method may be capable of processing some large scale problems. 相似文献
2.
3.
5.
Gengdong Cheng 《Acta Mechanica Sinica》2010,26(1):1-2
Xuesen Qian (Hsue-Shen Tsien), the father of China's rocketry and space technology, was born in Shanghai on 11 December 1911. He graduated from the Shanghai Jiaotong University in 1934 and received a degree in mechanical engineering there. He then spent an internship at Nanchang Air Force Base. Qian left China for the United States in 1935 to study mechanical engineering and earned Master's Degree of Science from MIT 1 year later. 相似文献
6.
7.
1新技术革命中的信息技术
20世纪的新技术革命指的是电子技术、核能技术、信息技术、激光技术、空间技术、新材料技术、基因技术、纳米技术等高新技术群落的崛起.其中信息技术在新技术革命中占据特殊地位. 相似文献
8.
9.
空间技术用固体润滑的发展现状与展望 总被引:2,自引:0,他引:2
本文对固体润滑在宇宙飞行器、人造卫星、空间站及空间运载系统小的应用进行了概述,并就其在降低空间机械部件的摩擦磨损、延长使用寿命、提高材料的耐高低温性和对宇宙气体或真空及储存环境的适应性等方面的研究工作发展现状作了评述,还对其未来的发展前景作了展望,指出其研究工作很有可能朝着润滑剂专业化的方向发展,预科固体润滑剂的复合效应将在解决许多新的空间机械润滑问题上发挥有效作用。作者认为,近几十年来在空间技术用固体润滑方面取得了长足的进步,但也还有大量的问题需要研究。 相似文献
10.
We consider the n-dimensional modified quasi-geostrophic(SQG) equations δ_tθ + u·▽θ+kΛαθ=0, u = Λα-1R⊥θ with κ 0, α∈(0, 1] and θ0∈ W1,∞(Rn). In this paper, we establish a different proof for the global regularity of this system. The original proof was given by Constantin, Iyer, and Wu[5], who employed the approach of Besov space techniques to study the global existence and regularity of strong solutions to modified critical SQG equations for two dimensional case.The proof provided in this paper is based on the nonlinear maximum principle as well as the approach in Constantin and Vicol [2]. 相似文献