共查询到20条相似文献,搜索用时 31 毫秒
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本文选择了硝酸、王水、逆王水,进行碳钢、低合金钢溶样条件试验,以谱线强度为指标,溶解酸种类、溶解酸浓度、溶解酸用量、定容酸用量等四因素为变化条件,各因素中有三水平,即按正交实验表L_9(3~4)进行试验,编制计算程序,快速、科学地优选出最佳溶样条件—30ml NHO_3(1+5v/v)和3ml HCl,ICP-AES法同时测定铝、砷、铬、钴、铜、磷、锰、钼、镍、硅、锡、钛和钒13种元素。为确定测试方法的重复性(r)和再现性(R)而进行精密度试验。精密度数据是由10个实验室对7个样品作试验确定的。方法的回收率为94%-105%。精密度在8%以内。 相似文献
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采用ICP-AES法测定GH3128合金中硅、锰、钨、钼、铬、钛、铝、铁、锆等多种合金元素。系统研究了各元素4条分析谱线的光谱干扰情况,根据光谱干扰研究结果和分析谱线的灵敏度、信背比以及等效离子浓度等进行了分析线的选择。采用柠檬酸络合钨,基体匹配法消除共存元素干扰,效果良好。 相似文献
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Mott scattering factors are needed for the quantitative interpretation of elastic scattering phenomena in electron spectroscopy and microscopy. The inelastic mean free path of electrons has been deduced from the elastic peak intensity. The theoretical approach is based on the effective elastic cross section derived from the differential elastic cross sections. In the present work they are calculated using the partial wave expansion method, supplying as well the Mott scattering factors. Tabulated data are presented for a number of elements and 500–3000 eV electrons in steps of 2° or 5° of the scattering angle θ. The effective and total elastic scattering cross sections are also presented. 相似文献
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石油焦中Fe、Ni、V、Na、Si、Ti的ICP-AES测定 总被引:1,自引:0,他引:1
本文提出用ICP-AES法直接测定石油焦中Fe、Ni、V、Na、Si、Ti含量,该测试方法能满足我厂石油焦中金属元素的检测,测定结果的准确度和精密度均满足分析要求。 相似文献
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《仪器科学与技术》2013,41(4):439-440
ABSTRACT This paper presents some results of experimental research addressing the influence of different thermal insulation fillings on dynamic properties of industrial resistance temperature probes, based on a thin-film platinum resistance temperature detector. The experiments were carried out with four jacket thin-film resistance temperature probes, all having identical protection tube geometry, yet differing in the thermal insulation filling materials. Further, a comparison between transient response characteristics in water established experimentally and those based on simulations with electric–thermal analogy, is given. The results of these analyses can be applied to enhance the dynamic response of temperature measurement made by temperature probes in water. 相似文献
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Isaac GH Thompson J Williams S Fisher J 《Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine》2006,220(2):119-133
When first introduced, total hip replacements offered pain relief and improved mobility in elderly patients. The success of this procedure in terms of long-term durability and restoration of function has led to its use in younger, more active patients. This has resulted in a commensurate increase in patient expectation regarding longevity and the degree to which function and lifestyle is restored. The bearing surface is a key feature of the performance of replacement joints. It is generally accepted that excessive amounts of wear debris preclude their long-term survivorship and hence there is an ongoing requirement for bearing surfaces which minimize debris generation. The purpose of this paper is to review the factors which affect the performance of so-called metal-on-metal bearings, to compare their performance with that of the other commonly used contemporary alternatives, metal and ceramic articulating against highly cross-linked polyethylene, and ceramic-on-ceramic, and finally to consider the potential solutions offered by new developments such as ceramic-on-metal and coatings applied to metal-on-metal bearings. 相似文献
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在德国和捷克共和国建有工厂的AZ Formen及Maschinenbau GmbH公司,作为模具和模具闭合系统的制造商40年多年来一直服务于38个国家的轮胎工业。 相似文献
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本文采用电感耦合等离子体发射光谱对硅单晶材料中6种金属杂质的分析进行了研究。研究了基体硅对分析元素的干扰影响及校正。采用压力溶样器制各样品,并在低温进行杂质富集,采用ICP-AEC对杂质进行了分析,回收率在90%~105%之间。 相似文献
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建立电感耦合等离子体质谱法(ICP-MS)一次进样同时测定大米中重金属As、Pb、Cu、Zn、Cr、Cd、Ni元素含量的方法。实验表明,本方法的线性范围宽,线性相关系数在0.9994~0.9999范围内;元素检出限低,7种重金属元素检出限范围为1.52~51.3μg/kg;精密度良好,测定7种重金属元素含量的相对标准偏差均〈5%;采用国家标准物质大米(GBW10010)和玉米(GBW10012)测定对照,评价了方法的准确性,各元素的回收率在91.2%~110%范围内。结果表明,该方法简便、快速、灵敏、准确,适用于大米、玉米中7种重金属元素含量的同时测定。 相似文献
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本文推导了传递函数MTF对结构参数r、d、n的微分计算公式,给出了MTF对偏心差δ和局部光圈△N的微分表达式,这些对于以MTF为性能指标,优化求解公差和光学自动设计,都是很有用处的。 相似文献
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密闭消解电感耦合等离子体质谱法测定铝土矿中锂、锶、镓、铌、钽、锆和铪 总被引:1,自引:0,他引:1
采用电感耦合等离子体质谱,硝酸-氢氟酸增压密闭消解样品,实现了铝土矿中锂、锶、镓、铌、钽、锆和铪的同时测定。实验中探讨了最佳的消解程序,选择适当的同位素,并用铑、铼做内标元素,有效地抑制了分析信号的漂移。各元素的检出限在0.02~1.00μg.g-1,相对标准偏差在0.63%~1.63%,Nb,Ta,Hf的回收率在99.2%~99.6%;该方法经国家标准物质(GBW07177,GBW07182,GBW07180)验证,各元素测试结果与真值很接近。 相似文献