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1.
连续光源原子吸收光谱仪   总被引:3,自引:0,他引:3  
赵泰 《现代仪器》2005,11(3):58-61
原子吸收使用的光源主要是空心阴极灯,即锐线光源原子吸收,每分析一个元素就要更换一个元素灯,使原子吸收分析的速度、信息量和使用的方便性等方面受到限制。商品化连续光源原子吸收多元素分析一直是分析工作者的一个长期梦想。本文详细介绍由德国耶拿分析仪器股份公司(AnalytikJenaAG)成功研制的世界第一台商品化连续光源原子吸收光谱仪(contrAA)的关键技术,主要技术指标,显著特点和发展前景  相似文献   

2.
连续光源原子吸收光谱仪--划时代的技术革命   总被引:2,自引:1,他引:1  
长期以来,原子吸收使用的光源主要是空心阴极灯,即锐线光源原子吸收,每分析一个元素就要更换一个元素灯,使原子吸收分析的速度、信息量和使用的方便性等方面受到了限制。商品化连续光源原子吸收多元素分析一直是分析工作者的一个长期梦想。详细介绍了由德国耶拿分析仪器股份公司(Analytik Jena AG)成功研制的世界第一台商品化连续光源原子吸收光谱仪(contrAA)的关键技术、主要技术指标、显著特点和发展前景。  相似文献   

3.
通过对原子吸收光谱仪的工作条件和开机的准备条件进行归纳,阐述了火焰原子吸收分析最佳条件的选择方法及石墨炉原子吸收分析最佳条件的选择方法.  相似文献   

4.
通过将原子吸收光谱仪的空心阴极灯改换成连续光源,燃烧器换成吸收池,研究铝与铬天青S的显色反应,以获得较好的实验结果。  相似文献   

5.
介绍便携式原子吸收光谱仪的研究与探索过程,说明其关键技术:钨丝电热原子化系统和光源、CCD分光检测系统的结构、性能试验研究以及仪器分析方法。通过对便携式原子吸收光谱仪与常规原子吸收分光光度计的分析性能,以及比较典型元素的测试结果,探讨便携式仪器的分析特点和发展前景。  相似文献   

6.
就原子吸收光谱仪的相关知识,结合在具体使用ZEEnit 700P原子吸收光谱仪过程的一些问题,就光源、波长校正、点火、雾化器优化及火焰自动优化等获得的相关经验进行小结,为使用该型号仪器提供一定程度的参考。  相似文献   

7.
《现代科学仪器》2004,(5):52-52
1965年由北京有色金属研究院吴廷照工程师等人组装成功中国第一台原子吸收光谱仪至2005年是40周年。我国第一台原子吸收光谱仪的诞生为中国原子吸收事业的发展奠定了良好而坚实的基础,40年来我国原子吸收光谱仪因此开始取得了极大的发展,为我国科学技术的发展做出了很大的贡献。吴廷照教授在从事化学分析、原子吸收光谱分析五十五年来始终奋斗在我国原子吸收光谱发展事业的第一线上,他工作兢兢业业、任劳任怨,从不计较个人得失,足迹遍布国内所有原子吸收光谱仪的生产厂家,先后研制成功空心阴极灯、高性能空心阴极灯(获国家专利)、金属套玻璃高效雾化器(获国家专利)、流动注射氢化物发生器等原子吸收相关产品,这些产品都在我国原子吸收行业取得全面的推广和应用,对我国和世界原子吸收的发展做出了巨大的不可磨灭的贡献。  相似文献   

8.
本文介绍了美国Varian SpectrAA-20型原子吸收光谱仪及其在铝合金和表面处理液中的应用情况,指出增大工作电流可提高该光谱仪的测量灵敏度。  相似文献   

9.
《现代科学仪器》2001,(6):65-67
德国耶拿分析仪器股份公司 (AnalytikJenaAG)近年不断推出一系列新型号的原子吸收光谱仪和诸多创新的特殊应用技术。本文重点对该公司及其最新原子吸收技术作一简要介绍。196 0年卡尔·蔡司公司 (CarlZeissJenaGmbH)开始设计和制造原子吸收光谱仪 ,在AnalytikJena全面接管其分析仪器业务后于 1998年推出全自动微机控制原子吸收光谱仪AASvario 6 ,该仪器首先实现自动固体样品分析 ,结合横向加热石墨炉技术、快速火焰 /石墨炉原子化器切换技术 ,从而开辟了原子吸收光谱技术崭新的发展方向…  相似文献   

10.
高芸 《现代仪器》1999,(4):50-51
本文主要介绍了PE-4100型原子吸收光谱仪的主要结构和工作原理,并用非线性方法对仪器进行了校准,结果令人满意。  相似文献   

11.
The paper surveys the current state of the theory of the fundamental concepts of measurement which is based on the model theory of logic. A brief review is given of the historical development of measurement theory. The model-theoretic definition of measurement is presented, together with a discussion of representation and uniqueness conditions. Nominal, ordinal, extensive and interval measurement structures are outlined. The classification of scale types and the problem of meaningfulness are considered. A survey is given of conjoint and derived measurement. A brief review is made of the applications of measurement theory. Consideration is given to the treatment of uncertainty. The setting-up of systems of scales of measurement for a domain of science and its relation to theories for that domain are discussed. It is argued that measurement as defined is related to other forms of symbolic representation such as is involved in computer data representation and natural language.  相似文献   

12.
某型客车前后悬架均为混合空气悬架,需要对该型客车进行侧倾稳定性分析计算。首先,确定该客车前后悬架的侧倾中心和整车侧倾中心线;其次,计算出侧倾力臂、侧倾力矩;然后,推导了悬架侧倾角刚度计算公式,讨论了两种横向稳定杆垂直刚度计算方法——基于材料力学经典理论的方法和有限元分析法;最后,计算了该型客车的侧倾角刚度、整车在0.4g侧向加速度时的侧倾角,并根据相关标准对该型客车的侧倾稳定性进行了评价。这种客车侧倾稳定性分析方法适用于混合空气悬架的设计计算以及侧倾仿真模型的校核计算。  相似文献   

13.
主齿轮箱是某船重要动力设备,需要对其进行经常性监测。测量了某船1#和2#主齿轮箱的振动加速度信号,比较了两齿轮箱振动信号的时间历程曲线和频谱,发现2#齿轮箱频谱最大幅值约为1#齿轮箱的2.5倍,而且该谱值对应的频率接近于啮合频率。在啮合频率附近对所测信号进行了带通滤波,对滤波后的窄带信号进行了Hilbert变换,得到了该窄带信号的包络。两齿轮箱的包络信号差异明显,1#齿轮箱包络信号的频谱频率成分丰富,而2#齿轮箱包络信号的频谱具有突出的单一频率成分。结果表明2#齿轮箱存在轻微的故障。而油液分析的结果也表明,2#齿轮箱的磨损大于1#齿轮箱,说明了采用的振动分析方法的合理性。  相似文献   

14.
We outline the results of a computer program which calculates frequency distributions of functions of cross-sectional regions of convex planar-faced polyhedra, ‘sphero-polyhedra’, and populations of perturbed polyhedra. This is done by ‘cutting’ a computer representation of the figure by a large number of random planes. The procedure is applied to cubes, dodecahedra, truncated octahedra, and approximate β-tetrakaidecahedra. Certain aspects of the shape of the object, e.g. sharpness of corners, angularity, compactness, and degree of symmetry are related to aspects of the shape of the distribution curves, e.g. beginning and ending points of the curves, rate of rise of the peak, relative location of the peak, and height and width of the peak.  相似文献   

15.
减振器的主要功能是提供阻尼力以衰减和抑制车辆系统振动,对高速动车组动力性能有十分重要的影响。既有研究主要将减振器处理为阻尼力以研究车辆系统动力性能,极少从动力学和结构可靠性角度关注减振器自身承受的载荷。制作某型高速动车组转向架抗蛇行减振器、轴箱减振器、二系横向和垂向减振器测力元件,在大同-西安高速线路上测试并获得该型动车组运行过程中四种减振器载荷引起的应变信号。对测试数据进行处理和分析,获得高速动车组运行工况下四种减振器载荷的时间历程,分析减振器载荷的时域和频域特征。采用雨流计数法统计减振器载荷峰谷值和频次,获得不同速度等级下载荷分布。结果表明,高速动车组抗蛇行减振器载荷最大、二系横向减振器载荷最小。轴箱减振器相对速度最大、二系横向减振器相对速度最小。减振器载荷总体上呈正态分布,而且一般有列车运行速度越高减振器载荷越大。列车正线行驶时曲线半径对轴箱减振器、二系垂向减振器以及二系横向减振器载荷影响不明显,列车速度和线路小半径曲线对抗蛇行减振器载荷影响明显。  相似文献   

16.
混合驱动机构研究进展与发展趋势   总被引:1,自引:0,他引:1  
混合驱动机构是可控机构的一种,其适度柔性以及降低驱动与控制成本的特性与优势使其成为现代机构学的重要研究分支之一。随着对混合驱动机构研究的深入,混合驱动机构理论和应用也不断地发展和创新。对现有的研究成果加以分析和总结将有利于促进混合驱动机构理论和应用的进一步发展。分析混合驱动机构的内涵,分别论述双自由度和多自由度混合驱动机构的研究进展,主要包括:混合驱动机构的构型设计与可动性、混合驱动机构的轨迹特征、混合驱动机构的运动学、混合驱动机构的动力学及混合驱动机构的应用等方面的研究进展。提出混合驱动机构研究的关键问题,总结了混合驱动机构的未来发展趋势。研究成果对拓展混合驱动机构的设计空间、开辟混合驱动机构新的应用领域具有重要意义。  相似文献   

17.
The general development of the tongue in birds was described by Lillie ( 1908 ) in chicken. Bryk et al. ( 1992 ) also studied the tongue development in chicken and they observed development of the conical papillae of the body. Our study aims to describe the timing of the development of the tongue morphological features in the domestic goose by using SEM methods. The tongue of the domestic goose is characterized by the widest variety of shape of the particular part of the tongue and mechanical papillae. Results indicated that the formation of the apex, body, lingual prominence, and the root of the tongue take place between the 10th and 19th day of incubation. The tongue elongates rapidly between the 16th and 18th day of incubation. Simultaneously, the median groove appears on the body and the lingual prominence and elongates towards the rostral part of the tongue. The conical papillae of the tongue develop gradually. On the body, the conical papillae develop from the caudal part of the body to the rostral part and on the lingual prominence from the median part of the prominence to the lateral part. Hair‐like papillae at the caudal surface of the body of the tongue remain primordial to the end of the incubation. Our studies on the morphogenesis of the tongue in the domestic goose revealed changes in shape of the particular part of the tongue and rapid pace of the formation of mechanical papillae. The tongue is completely develop before hatching and ready to collect food. © Microsc. Res. Tech., 2012. © 2012 Wiley Periodicals, Inc.  相似文献   

18.
Some key directions of study of the friction and wear of solids under conditions of boundary lubrication by an adsorption layer are analyzed. The ideas and methods of the studies are considered in sequence starting from works of the founder of the boundary lubrication concept W. Hardy and proceeding to the results of the outstanding scientists of the following generations—F.P. Bowden, D. Tabor, B.V. Deryagin, A.S. Akhmatov, G.I. Fuks, R.M. Matveevskii, and others—and then to those of contemporary researchers. Tribochemical aspects of lubrication by an adsorption layer are discussed. Special attention is paid to attempts to develop physical and mathematical models of the boundary lubrication process.  相似文献   

19.
This paper shows that in the task of the maintenance of constant orientation of the body of a walking robot the determination of the actual position of the body, i.e. absolute altitudes of its points and remoteness from the supporting surface, is the most complicated problem. Two possible systems of measurement and stabilization of the position by the height of the body of the walking mechanism are compared, i.e. a system of adaptation automatically adjusting the length of the supporting leg to the roughness of the terrain, and the system of the maintenance of constant remoteness of the body from the terrain. The inefficiency of a solitary application of any described system is revealed and the possibility of an accumulation of errors of the position of the body by the walking on the soft terrain is shown. Possible approaches for raising the quality of stabilization of the body by the walking are evaluated.  相似文献   

20.
A problem of identification of a shear-type solid flow is considered. Characteristics of the shear flow are determined on the basis of the initial displacement vector field. An algorithm of formation of a finite-size model displacement field of the shear type is given. A functional is proposed to search for the amplitude and direction of the shear flow for each local area of the vector field. The influence of the size of this area and of the degree of its overlapping with the shear flow on the error of shear angle measurement is shown. The choice of the local area size is analyzed. Functional operation is demonstrated by an example of the displacement field obtained in the case of compressive loading of the Hadfield steel single crystal.  相似文献   

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