Atomic-scale mechanism of the θ’’→θ’ phase transformation in Al-Cu alloys

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.     

’92～’93日本摄影产品销售概况

’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。...     

与助动词‘たぃ’相对应的‘か’和的‘を’使用规律

学生下企业实训后回到学校，在一次感想交流会上有一位同学讲了这样一个问题：有一次问某个日方人员晚上去哪里吗？有何打算？他说：     

’97栏目展望

’９７栏目展望’９６年改版大１６开已经十个月了。十个月的友情并不短暂，’９７本刊将尽努力把栏目办得更丰富多彩，──将老栏目办出新水平、出新栏目适应读者新追求──奉献给新朋老友。专家论坛──旨在对照相机械工业的现状和发展趋势有一个权威的阐述和评论。聘请...     

Editor’s Note

Editorial

Editor’s Note     

Editor’s Note

Editorial

Editor’s Note     

’94 PMA新产品

’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、...     

On Hirsch’s h,Egghe’s g and Kosmulski’s h(2)

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.     

Yesterday’s dreams and today’s reality in telecommunications

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.     

’97 PMA 印象

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…     

’96栏目扫描

’９６栏目扫描随着９６年改版大１６开，增加彩页，在这些形式变革的同时，本刊试行栏目编辑责任制已有三期，这三期办得怎么样’！和９５年相比较，有那些提高，有那些不足，本刊真诚地欢迎读者激扬文字，品头论足。９６年本刊已经或陆续推出下列栏目，不知您是否喜欢’...