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由中国牵头制定的国际标准ISO 4306-4《起重机——术语——第4部分:臂架起重机》于2019年11月8日至2020年1月31日,进行了国际标准征询意见草案(DIS)投票,投票期间收到ISO中央秘书处、法国、瑞典和美国反馈的评价意见共59条,为尽快将各国评价意见的处理结果反馈至ISO/TC 96/SC8起重机技术委员会臂架起重机分技术委员会秘书处,2020年2月12日19:00至21:15,北京起重运输机械设计研究院有限公司组织召开了ISO 4306-4《起重机——术语——第4部分:臂架起重机》国内专家工作组会议,会议采用腾讯会议软件。参加会议的有来自北京起重运输机械设计研究院有限公司、交通运输部水运科学研究院、上海振华重工(集团)股份有限公司、大连博瑞重工有限公司、大连理工大学的专家,共5个单位5名代表。 相似文献
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2013年6月17-20日,IEC/TC44/MT 60204-1工作组第17次会议在英国伦敦英国标准学会(BSI)召开.北京机床研研究所全国工业机械电气系统标准化技术委员会(SAC/TC231)组织了IEC60204-34国际标准项目中国专家参加了此次会议. 相似文献
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2022年1月14日,全国起重机械标准化技术委员会流动式起重机分技术委员会(以下简称"流动式起重机分会")在湖南省长沙市组织召开了JB/T 12576—2015《轮胎起重机》(英文版)专家审查会,会议以线上和线下相结合的方式召开,参加专家审查会的有流动式起重机分会委员、标准主要起草人、行业专家及外语专业人员、标准主要负... 相似文献
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《仪器仪表标准化与计量》2012,(1):10
1会议背景和意义IEC/TC65(工业过程测量、控制和自动化)的顾问组(AG)会议于2012年2月7日~8日在法国尼斯召开,共有来自德国、法国、日本、美国等国的21名专家参加了此次会议。作为IEC/TC65的国内对口单位,全国工业过程测量和控制标准化技术委员会(SAC/TC124)多年来积极参与IEC国际标准化活动,在工业通信网络、工业无线等多个领域做了大量研究并取得了多项国际标准突破。 相似文献
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《仪器仪表标准化与计量》2013,(6):12-12
<正>2013年12月2日~4日,第五届全国工业过程测量控制和自动化标准化技术委员会(SAC/TC124)第一次全体会议,第二届全国测量、控制和实验室电器设备安全标准化技术委员会(SAC/TC338)第一次全体会议,第一届全国实验室仪器及设备标准化技术委员会(SAC/TC526)第三次全体会议,同时在上海召开,约400名委员和专家参加了本次会议。 相似文献
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介绍了二重自主设计制造的1 580 mm F1E立辊轧机的主要技术参数、工作原理、设备组成和技术特点。该设备应用于热轧带钢生产线,运行稳定。 相似文献
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Flute grinding is a critical process in end-mill manufacturing. The wheel geometry and position during the grinding process govern the flute profile and determine the flute parameters (i.e. rake angle, core radius, and flute width). Accuracy of these parameters should be ensured to obtain optimal cutting performance. For a given wheel geometry, the current technologies can only determine the wheel position for the desired rake angle and core radius without consideration of the flute width. This disadvantage seriously restricts the improvement of machining quality and the flexibility of flute grinding. To cope with this problem, this paper presents a novel method of five-axis flute grinding using standard 1V1/1A1 wheels to ensure the accuracy of the three flute parameters. Based on the theories of analytic geometry and envelope, equations for calculating the flute parameters are first derived. Afterwards, a system of nonlinear equations is created to calculate the wheel position for flute grinding. The validity of the proposed method is verified by 3D simulations and machining experiments. Lastly, the sensitivity of the valid flute width with respect to the wheel geometric parameters is further investigated in this work. 相似文献
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Frictional coefficients were measured at atom-flat NaCl (1 0 0), (1 1 0) and (1 1 1) surfaces with frictional force microscopy. At the electrically neutral (1 0 0) and (1 1 0) surfaces in 15% relative humidity, lower friction was detected along 1 1 0 direction where the same kind of ions are aligned, than along 1 0 0 direction where different ions alternate. Low and isotropic friction was observed at the polar (1 1 1) surface. The results were explained by the gradients of electrostatic interaction potentials between a dipole at the tip and the ions at the surface. Toward higher relative humidity up to 60%, frictions at the (1 0 0) surface decreased indicating lubrication effect by water. The changes observed for the (1 1 0) surface suggested presence of adsorbed water in stripe pattern along the 1 1 0 direction. In the higher humidity range, frictional force increased at all the surfaces, probably due to larger normal force caused by the meniscus force. 相似文献
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Photofield emission (PFE) measurements are employed to examine modifications of the surface electronic structure of the tungsten (1 1 1) facet upon deposition of thin films (1-3 monolayers) of titanium. With the help of DFT simulations, the observed PFE features are interpreted as adsorbate-induced resonance states with energies just below the Fermi level, localized predominantly at the exposed surface atoms. Comparison between the computed surface DOS distributions and the measured PFE spectra is also used to verify various possible arrangements of the Ti adatoms, supporting the DFT-favored model of Ti growth in registry with the W(1 1 1) substrate until a full physical overlayer of the adsorbate is completed. 相似文献