共查询到20条相似文献,搜索用时 0 毫秒
1.
《材料科学技术学报》2017,(10)
The phase transformation of θ’’→θ’ in an Al-5.7 Cu alloy was investigated by aberration-corrected scanning transmission electron microscopy, and the tranformation mode of θ’’→θ’ during aging treatment was clarified. In the presence of the θ’ phases, θ’ was found to be formed by in-situ transformation fromθ’’ with the same plate shape, size and broad faces. The transformation starts from multiple sites within the θ’ precipitate and the whole θ’ phase finally forms as the preferential θ’ sections grow and connect with each other. Antiphase domain boundaries are also found in some θ’ precipitates when the disregistry exists between different θ’ sections. 相似文献
2.
’92~’93日本摄影产品销售概况1993年,日本摄影产品继续面临泡沫经济衰退的困境,国民消费减少,照相机及摄影器材销路不畅。1992年,日本国民生产总值仅增长1.5%,国内生产总值增长1.3%,消费增长仅达1.7%。业余摄影市场的消费增长甚至更低。... 相似文献
3.
The visibility of an article depends to a large extent on its authors. We study the question how each co-author’s relative contribution to the visibility of the article can be determined and quantified using an indicator, referring to such an indicator as a CAV-indicator. A two-step procedure is elaborated, whereby one first chooses an indicator (e.g. total number of citations, h-index …) and subsequently one of two possible approaches. The case where the indicator is an h-type index is elaborated in a Lotkaian framework. Different examples illustrate the procedure and the choices involved in determining a CAV-indicator. 相似文献
4.
6.
7.
8.
McIntyre R. Louthan 《Journal of Failure Analysis and Prevention》2011,11(3):177-177
Editorial
Editor’s Note 相似文献9.
10.
11.
Quentin L. Burrell 《Scientometrics》2009,79(1):79-91
In recent issues of the ISSI Newsletter, Egghe [2006a] proposed the g-index and Kosmulski [2006] the h(2)-index, both claimed to be improvements on the original h-index proposed by Hirsch [2005]. The aim of this paper is to investigate the inter-relationships between these measures and also their time dependence
using the stochastic publication/citation model proposed by Burrell [1992, 2007a]. We also make some tentative suggestions regarding the relative merits of these three proposed measures. 相似文献
12.
《Technology in Society》2004,26(2-3):223-233
Twenty-five years ago the telecommunications industry had its vision of the future. There were three dreams that, given the right technology, they could achieve: (1) the Dick Tracy wristwatch phone; (2) the Picturephone; and (3) the set-top box for the home television which could access an information store maintained by the telephone company. None of these dreams turned out as planned, but it is interesting to compare the original concepts with what has actually transpired in the last quarter-century. Today, having achieved some form of each of these three dreams, it seems as if, looking ahead to tomorrow’s technology, the industry has no similar vision. 相似文献
13.
应PMA(PhotoMarketingAssociationInternational)邀请,机械部组团前往,我有幸参加中国代表团亲赴美国新奥尔良(NewOrleans)参加’97PMA展。’97PMA是美国照相机市场专业协会每年一次年会暨照相器材展示,类似德国的科隆博览会,我国的杭博会,是美国每年一次最大的照相器材展示会,她的影响不仅仅限于美国,还辐射影响加拿大、拉丁美洲和南美洲。’97PMA,中国是第一次组团参加,核心单位是机械部生产司,杭州照相机械研究所、中国文办照相机械专业协会、上海科隆摄影器材流通中心、上海海鸥照相机厂、江西光学仪器总厂。我国… 相似文献
14.
’94PMA新产品1.胶卷类Agf。DIVISIOnOfMileS公司又添专业胶卷新品种Agfa、ColorOPtima400。其特点是颗粒细腻、色彩还原准确,有35mm和120两种规格。中国胶片装备公司展出了其Prisme35mm彩色胶卷,有12、... 相似文献
15.
17.
18.
19.