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《中国制造业信息化》2007,(18):80
润华集团股份有限公司是一家跨地区、跨行业的综合性大型股份制企业集团,山东省政府确定的全省首批51家现代企业制度试点单位之一.经营领域涉及汽车销售、汽车修理、配件供应、旧机动车交易、客运出租、汽车租赁、机动车拍卖、房地产开发、制药、进出口贸易、物业管理、广告企划等众多行业,并参股金融业,基本确立了以汽车服务业、药业、房地产业为支柱产业,投资、贸易、实业协调并进的发展格局. 相似文献
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中国机床工具工业协会 《世界制造技术与装备市场》2008,(1):28-29
1.中央和地方省市主要领导频繁视察机床行业企业,国家为数控机床产业发展创造了空前良好的发展环境 胡锦涛、吴邦国、温家宝、贾庆林、李长春等党和国家领导人以及辽宁、黑龙江、山东、江苏、云南、湖北、广东、陕西、浙江、天津、重庆等省市主要领导相继视察了机床工具厂和数控系统厂.各级领导频繁视察,为数控机床产业的发展创造了空前良好的发展环境. 相似文献
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论述了波长色散X射线荧光分析装置的发展状况。除了继续发展其在高含量、常量和微量元素分析上高精度、高稳定性的固有特点之外,在进一步提高灵敏度,使分析范围扩展到痕量分析范围;开拓微区面分布的元素成像分析;进一步对传统分析困难的轻元素和中重金属元素的探讨,开发新的高级次谱线分析方法;适应新材料特别是纳米材料的分析要求,对薄膜分析的开拓等方面,已经有了长足的发展。本文介绍在商品化的分析装置方面的发展状况。同时本文引入对无标样分析的基本参数法(FP法)目前发展状况的介绍。 相似文献
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Sanda Maria Doncea Rodica Mariana Ion Radu Claudiu Fierascui Elena Bacalum Andrei A. Bunaciu 《仪器科学与技术》2013,41(1):96-106
The research has been focusing on some connection between the chemical composition of the papers obtained by Fourier transform infrared (FTIR) spectroscopy and the nature of the fillers, determined by energy dispersion X-ray fluorescence (EDXRF) spectroscopy. The present paper corroborates the FTIR and EDXRF results obtained for some historical papers from books of the XIX-th and XX-th centuries, from private collections. These analytical results allowed a first approximation of technological paper composition and of the age determination of the samples. This analytical method can elaborate some properly methods for paper documents preservation, taking into account the aging and degradation processes of the historical paper. 相似文献
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Increasing the solid angle of X-ray collection is a major factor in improving the analytical sensitivity of X-ray energy-dispersive spectrometry (XEDS) in the analytical electron microscope (AEM). A new scanning transmission electron microscope, the VG HB 603, is equipped with two XEDS detectors with the largest collection angles (0.30 and 0.17 sr) available in commercial AEMs. However, large collection angles result in a large range of take-off angles, from ~ 4° to 36°, and the low angles can cause strong X-ray absorption. In order to investigate possible detrimental effects of the low (and of the range of) take-off angles on quantitative microanalysis of specimens exhibiting significant absorption, a stoichiometric Ni3 Al thin-film, in which the Al Kα line is significantly absorbed, was analysed. Furthermore, the effect of different values of the collection angle on X-ray intensities was theoretically evaluated by numerical calculations and spectral simulation. These theoretical approaches permitted correlation of changes in the X-ray take-off angle (and hence X-ray absorption) with changes in the collection angle. It is demonstrated that ~ 0.30 sr detectors, with minimum take-off angles as small as 4°, only result in maximum errors of 4% in the quantification of Al in Ni3 Al and, therefore, further increases in collection angle can be pursued while maintaining current levels of accuracy of quantification. 相似文献
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球铰刚度计算模型及靠冗余支链实现并联机床刚度的改善 总被引:9,自引:0,他引:9
以Stewart机构为例提出一种基于解析法和有限元法的刚度分析新方法。应用有限元软件模拟球铰内的非线性接触变形,将计算结果抽象成一个特征参数带入机构的刚度解析模型中,然后得到机构的刚度矩阵,以解决在解析模型中无法处理铰链刚性的问题,并采用有限元软件证实该方法的可靠性。如果在解析模型中忽略球铰变形,则整个机构的刚度解析结果将产生较大误差。在此基础上,应用该方法定量研究采用主动冗余支链对提高并联机床刚性的效果。结果表明,在一定工作空间范围内,主动冗余支链可以显著提高并联机床的刚性。 相似文献
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谭秉和 《分析测试仪器通讯》1995,(1)
文章介绍的SIMULTIX 10和SIMULTIX 11是拥有众多用户的SIMULTIX 3550型仪器之后开发的新机型。由于采用了最新的硬件和软件,因而进一步体现了高性能、小型化、高速度和易操作的特点,以满足多样化的分析要求。 相似文献
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This study reports k factors for an ultra-thin window (UTW) Si(Li) energy dispersive (ED) X-ray detector which extends the limit for X-ray microanalysis in the analytical electron microscope (AEM) to elements below Na in the periodic table. The oxygen k factors reported for the UTW ED detector suggest that quantitative thin specimen X-ray analysis can be extended to oxygen. 相似文献
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The contribution of French science to the field of biological X-ray microanalysis is reviewed. The main analytical microscopy centers are listed, and their methods and main results are summarized. 相似文献
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基于ANSYS的高速车门变形分析 总被引:1,自引:0,他引:1
运用有限元法,对高速车门变形进行了研究,建立了以壳单元为基本单元的车门有限元分析模型,经过计算分析,获得了车门受载后的变形分布情况,为车门结构的优化提供了理论依据。 相似文献