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略论紫外可见分光光度计的光度准确度 总被引:1,自引:0,他引:1
本文从设计者、生产者和使用者的角度,讨论了紫外可见分光光度计(UV-VISS)的光度准确度(PA,Photometry Accuracy)的重要性;指出了影响UV-VISS的PA的主要因素;提出了如何保证或提高UV-VISS的PA的主要途径,本文可供设计、生产、使用和有关的领导者们参考。 相似文献
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本文从仪器学的角度,研究了高压液相色谱(HPLC)紫外检测器的主要技术指标。根据作者的实践,提出了这些主要技术指标的具体、简易、可行的测试方法,同时讨论了其他有关问题。 相似文献
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发表此文章的目的是向读者介绍一台国际先进水平的光谱仪器-美国BECKMAN(贝克曼)公司生产的DU-730紫外/可见分光光度计,它性能优良、应用广泛、操作简便,是生物医学实验室中非常实用的计量仪器。本文首先阐述了DU-750紫外/可见分光光度计的结构和原理,特别是这台仪器具有的先进的“微聚焦光束技术”。然后,介绍了仪器的各种主要技术参数,重点讨论了仪器的功能和所涉及的应用领域,包括:全波长扫描、固定波长测定、单一组分分析和蛋白质核酸的生物学测定等。最后作者为加强仪器的管理阐述了仪器的正确使用方法与维护,为正在应用这台仪器的读者提供一些有用的经验。 相似文献
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WIA(WirelessNetworksforIndustrialAutomation)是具有自主知识产权的工业自动化无线网络,它具有高可靠性、实时性、安全性等特点。本文对符合WIA—PA标准的工业无线芯片的关键技术进行研究,关注WIA—PA工业无线芯片系统架构、通信基带电路、WIA—PA协议引擎优化、安全加密、低功耗设计等方面。旨在提供符合WIA—PA标准的工业无线芯片的设计参考,为降低系统开发难度、保护相关知识产权、提高技术性能奠定坚实的基础。 相似文献
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诌议弹簧钢的切变模量取值 总被引:2,自引:0,他引:2
诌议弹簧钢的切变模量取值沈学忠(无锡市建材仪器机械厂214073)金属弹簧材料种类繁多,现在大量使用的是弹簧钢。在选用弹簧钢进行弹簧设计计算时,要用到材料的切变模量或弹性模量。目前,国内外几乎所有的设计资料和有关教科书[1]以及GB/T1239... 相似文献
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241Mc旋光分光光度计是Perkin-Elmer公司的产品,它在光学、电子学和仪器功能等的设计思想方面有一些特点。本文将这些特点归纳为五条,并对它们作了初步探讨;同时,根据作者的实践。对该仪器的使用、维修等有关的七个问题进行了讨论。 相似文献
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ICP—AES方法测定彩色显像管材料中的可溶性钇 总被引:1,自引:0,他引:1
本文介绍了用ICP-AES方法测定彩色显像管涂料中可溶性钇(Y)的测定方法、工作参数的选择及测定结果的精密度和准确度。作者用该方法为佛山彩色显管公司测定了47个样品,及时、准确地提供了可溶量数据。并对使用仪器结构特点做简要介绍。 相似文献
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[目的] 提出一种离线精确测定金属铝薄膜光学常数的方法,与传统的原位测量方法相比,不需要连接到真空室的复杂测量设备,方便快捷。[方法] 该方法以测量的椭偏光谱曲线和分光光谱曲线为目标,考虑金属铝薄膜在空气中表面氧化的影响,在混合优化算法的基础上,经过基于色散关系的多波长法拟合确定金属铝薄膜从紫外到可见区(200-800nm)的光学常数;[结果] 优化算法采用多种群并行遗传算法和最小二乘法相结合的方式,提高了拟合质量和速度,得到了理想的结果,光谱曲线拟合误差为0.5%。[结论] 在确定了铝光学常数的基础上,镀制了单腔紫外诱导透射滤光片,测量的透过率光谱与设计结果基本吻合 相似文献
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介绍了高温合金中钛含量测定的两种方法一二安替比啉甲烷吸光光度法和电感耦合等离子发射光谱法。本文通过对这两种方法进行了大量的对比试验,描述了两种方法的分析步骤,并且给出了电感耦合等离子发射光谱法测定高温合金中钛含量的最佳测试条件。两种分析方法都具有准确、相对标准偏差小的优点,对比吸光光度法,电感耦合等离子发射光谱法更加快速、方便。 相似文献
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Keiji Nakayama 《Tribology Letters》2010,37(2):215-228
In this work, the characteristics of triboplasma have been investigated from the point of view of how the kinds of the stationary partner influence the photon energy and the plasma distribution. The energy spectrum and two-dimensional images of the emitted photons were measured during the sliding of a diamond pin with a tip radius of 1.5 and 3 mm on the three kinds of disk made of Al2O3, MgO, and SiO2 in dry sliding in air. The results showed that all the three kinds of solid tested had narrow bands of air-discharge plasma in the ultraviolet region, demonstrating that the triboplasma generation does not depend on the kinds of insulating solids. Triboplasma was distributed having a ring with one or two tails in all the three kinds of solid Al2O3, MgO, and SiO2. The mechanisms of UV, visible, and IR photon emissions are discussed. The UV photons are emitted from the ionized plasma gas produced by discharging of air, while the visible photons are emitted from the defect and impurity centers excited by the triboplasma-photons, triboplasma-electrons, and frictional temperature rise together with the photons from the plasma itself. A 696-nm narrow band appeared only with Al2O3, and it was attributed to the Cr3+ ions excited by the UV photons and electrons from the triboplasma. The IR photons should be emitted from the sliding contact by the thermal emissions consisting of thermoluminescence and blackbody radiation, as well as from the triboplasma. The visible photon emission was strongest at the pair points facing across the frictional track in Al2O3 and MgO. To explain the photon emission at the pair points, a new model has been proposed, in which the visible photons are emitted from the surface defect and/or impurity centers excited by the back electrons accelerated with the inverse electric field caused by the negatively charged patches produced by the electron bombardment to the diamond surface. The negative charges on the frictional track repelled the back electrons, so that the back-electrons attack just outside the frictional track. 相似文献
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Optical modifications to a confocal scanning laser microscope are described which allow simultaneous fluorescence imaging of living specimens excited by ultraviolet (UV)- and visible-wavelength light. Modifications to a Bio-Rad MRC 600 Lasersharp confocal microscope include the introduction of UV-path-specific lenses and a specially designed UV transmitting eyepiece and tube lens. Upon UV excitation these modifications provide similar resolution and field flatness when compared with visible confocal microscopy. The UV-path-specific optics could be adjusted to correct for varying amounts of longitudinal chromatic aberration in commercially available objectives. Eyepiece and tube lenses were chromatically corrected for UV through visible wavelengths to minimize lateral chromatic error. With these modifications, UV-wavelength light may be used to excite ratioing dyes to quantify intracellular ion concentrations, or as an energy source to release caged compounds in a spatially restricted volume, while simultaneously imaging with dyes excited by visible-wavelength light. 相似文献
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本法用乙醇为溶剂,不需提取便可直接进行紫外分光光度法测定。测定浓度在20~80μg/ml时,浓度与吸光度的线性关系良好。平均回收率为99.98%。本法与药典法的测定结果基本一致。本法具有操作简便、准确、灵敏、快速的特点,可用于该类制剂的质量控制。 相似文献