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行业整合背景下的中国有色金属企业技术效率评价

来源:《中国有色金属学报(英文版)2013年第9期》
作者危 平 唐慧泉 陈 瑶 陈晓红
概略Trans. Nonferrous Met. Soc. China 23(2013) 2797-2806 Measuring technical efficiency of Chinese nonferrous metals enterprises on a background of industry consolidation Ping WEI1,2, Hui-quan TANG1, Yao... 2013; accepted 19 August 2013 Abstract: Since 2009, Chinese nonferrous metals industry has been carried out industry consolidation with strong support by the central government. This work examined......

Near ground wind characteristics during typhoon Meari:Turbulence intensities, gust factors, and peak factors

来源:《中南大学学报(英文版)2017年第10期》
作者黄鹏 王旭 YU Xian-feng(余先锋) 黄超
概略 of Technology,Guangzhou 510640, China Central South University Press and Springer-Verlag GmbH Germany 2017 Abstract: Wind data were collected during the 2011 typhoon Meari at heights of 10, 20, 30... Experimental setup 2.1 Description of typhoon Meari The 2011 Typhoon Meari is characterized by a wide range of influence, fast forward motion, and small intensity variations. The minimum distance between......

时效对无铅易切削Al-Cu合金的微观组织结构与性能的影响

来源:《中南大学学报(自然科学版)2007年第4期》
作者黄志其 尹志民 马海龙
概略法研究合金的腐蚀性能.研究结果表明:合金最适宜的时效热处理工艺为160 ℃/6 h,在此工艺条件下,合金的抗拉强度,屈服强度和伸长率分别为473 MPa,391 MPa和11.2%.合金的物相组成为Al基固溶体,Al7Cu2Fe,CuAl2以及低熔点物质Bi,SnBi和Sn;合金的晶间腐蚀深度为0.4 mm,其综合性能与含铅2011合金的相当. 关键词:无铅;切削;Al-Cu合金;显微组织;性能... is equivalent to lead-containing 2011 alloy. Key words: lead-free; cutting; Al-Cu alloy; microstructure; properties; intercrystalline corrosion           ......

三频载波多普勒组合的北斗星载钟短稳评估方法

来源:《中南大学学报(自然科学版)2014年第1期》
作者龚航 张鑫 黄新明 朱祥维 王飞雪
概略 2012) were estimated by the proposed method, with the results of 6×10-12(τ=1 s), 1×10-12(τ=10 s), 4×10-13(τ=100 s), 2×10-13(τ= 1 000 s). The estimation results of this method agrees well with those...以较简单的方法实现与复杂算法相当的精度,说明本文方法的有效性. 4  北斗星载钟短稳评估结果 利用本文方法对2012年12月为止北斗在轨运行的所有14颗卫星星载钟(均为铷钟)的短期稳定度进行评估,基于监测站01的B1,B2和B3三频载波多普勒观测数据,观测时间段与图2相同,结果如图4所示(为反映星载铷钟的频漂特性,图中结果没有扣除频漂影响): 由图4可见:14颗卫星的星载钟短期稳定度特性......

Application of response surface method for optimal transfer conditions ofmulti-layer ceramic capacitor alignment system

来源:《中南大学学报(英文版)2011年第3期》
作者PARK Su-seong KIM Jae-min CHUNG Won-jee SHIN O-chul
概略J. Cent. South Univ. Technol. (2011) 18: 726-730 DOI: 10.1007/s11771-011-0754-y Application of response surface method for optimal transfer conditions of multi-layer ceramic capacitor alignment... Heidelberg 2011 Abstract: The multi-layer ceramic capacitor (MLCC) alignment system aims at the inter-process automation between the first and the second plastic processes. As a result of testing......

中国铜资源安全演化轨迹模拟与评价

来源:《中国有色金属学报(英文版)2013年第8期》
作者王 昶 左绿水 胡平杰 姚海琳 朱 灏
概略Trans. Nonferrous Met. Soc. China 23(2013) 2465-2474 Evaluation and simulation analysis of China’s copper security evolution trajectory Chang WANG, Lü-shui ZUO, Ping-jie HU, Hai-lin YAO, Hao ZHU Institute of Metal Resource Strategy, Central South University, Changsha 410083, China Received 10 May 2013; accepted 10 August 2013 Abstract: Copper metal is one important raw material of national......

KOH亚熔盐体系中用CuO催化氧化浸出铬铁矿

来源:《中国有色金属学报(英文版)2017年第4期》
作者刘龙杰 杜浩 张洋 郑诗礼 张懿
概略 and the activation energy was calculated to be 15.79 kJ/mol when the temperature was above 230 °C. In contrast, without CuO, the rate-determining step was external diffusion {Chen, 2013 #2}and the apparent... of chromium dissolution from Philippine chromite ore at high oxygen pressure in KOH sub-molten salt solution [J]. Hydrometallurgy, 2013, 139: 46-53. [2] ZHANG Yang, ZHENG Shi-li, DU Hao, XU Hong-bin, ZHANG Yi......

Space luminous environment adaptability of missile-borne star sensor

来源:《中南大学学报(英文版)2012年第12期》
作者ZHAO Shu-fang(赵述芳) WANG Hong-tao(王洪涛) WANG Yu(王渝) JI Cai-yan(纪彩彦)
概略, the adaptability of missile-borne star sensor to space luminous environment was studied. As an example, a certain type of star sensor was considered when imaging to the starry sky on June 22, 2011 (the Summer Solstice) and September 20, 2011 (August 23 of the lunar year, last quarter moon) in Beijing. The space luminous environment and the adaptability to it were simulated and analyzed at the star......

低温环境暖风对改善人体舒适性的实验研究

来源:《中南大学学报(自然科学版)2012年第10期》
作者杨宇 李百战 刘红 李丹蕊
概略低温环境暖风对改善人体舒适性的实验研究杨宇,李百战,刘红,李丹蕊(重庆大学 城市建设与环境工程学院,三峡库区生态环境教育部重点实验室,重庆,400045)摘 要:为探索一种在低温环境中改善人体舒适性的局部供暖方式,于2011年1月在自然通风环境的实验室进行实验,共有62名受试者.设有3个实验工况,分别对受试者的颈部,腹部和小腿进行局部供暖风,实验持续30 min,受试者按照其主观感受填写调查问卷... environment, the experiment was carried out in a natural ventilation environment in January 2011 with 62 subjects. The experiment has 3 setting conditions, i.e. locally applying the warm airflow......

Forecasting model of residential load based on general regression neural network and PSO-Bayes least squares support vector machine

来源:《中南大学学报(英文版)2011年第4期》
作者何永秀 何海英 王跃锦 罗涛
概略J. Cent. South Univ. Technol. (2011) 18: 1184-1192 DOI: 10.1007/s11771-011-0821-4 Forecasting model of residential load based on general regression neural network and PSO-Bayes least squares... University Press and Springer-Verlag Berlin Heidelberg 2011 Abstract: Firstly, general regression neural network (GRNN) was used for variable selection of key influencing factors of residential load......
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