排序方式: 共有32条查询结果,搜索用时 437 毫秒
1.
柔性制造系统FMS是六十年代开始开发的一种先进制造系统,近十多年来得到迅速发展。它以电子技术和计算机技术为基础,具有高效率、高柔性、高精度的优点,适用于中,小批量、多品种生产。该文概述了FMS的基本内容、特点及其发展历史与动向。 相似文献
2.
3.
4.
5.
6.
7.
Tittmar HG 《Acta Astronautica》1990,21(4):267-269
It is argued that space sickness is not so much a physiological problem, but a psychological one, having its roots in the perception of the environment, and its associated cognitive processing. This cognitive processing is argued to be that of field dependence and field independence, for which exist psychobiological and cognitive assessment tests. Since there is an obvious economic advantage in the use of cognite testing, it is recommended that this could be used as an initial screening when selecting for astronauts. 相似文献
8.
9.
Paul AL Levine HG McLamb W Norwood KL Reed D Stutte GW Wells HW Ferl RJ 《Acta Astronautica》2005,56(6):623-628
Spaceflight experiments involving biological specimens face unique challenges with regard to the on orbit harvest and preservation of material for later ground-based analyses. Preserving plant material for gene expression analyses requires that the tissue be prepared and stored in a manner that maintains the integrity of RNA. The liquid preservative RNAlater (Ambion) provides an effective alternative to conventional freezing strategies, which are limited or unavailable in current spaceflight experiment scenarios. The spaceflight use of RNAlater is enabled by the Kennedy space center fixation tube (KFT), hardware designed to provide the necessary containment of fixatives during the harvest and stowage of biological samples in space. Pairing RNAlater with the KFT system provides a safe and effective strategy for preserving plant material for subsequent molecular analyses, a strategy that has proven effective in several spaceflight experiments. Possible spaceflight scenarios for the use of RNAlater and KFTs are explored and discussed. 相似文献
10.
振兴经济,发展生产,必须依靠科学进步,用新的科学技术不断改造企业,可以说工业发展的过程,就是对企业进行技术改造的过程。据估计,西方国家提高劳动生产率诸因素中,技术改造所占的比重,在全产业中为60%,在纺织工业中为40%,在钢铁工业中为88%,在机械工业中为70%。因此企业的技术改造,其重要性是显而易见的。战后日本,西德工业迅速恢复、发展、美苏在工业上保持领先地位,一个重要原因就是重视企业的技术改造。 相似文献