共查询到20条相似文献,搜索用时 62 毫秒
1.
液相色谱仪最小检测浓度的测量不确定度的影响因素主要有液相色谱仪最小检测浓度测量过程中的基线噪声以及重复性测量误差、检测使用标准溶液的浓度等。本文主要通过对基线噪声和最小检测浓度的描述分析,讨论基线噪声对液相色谱仪最小检测浓度的测量值的不确定度的影响。 相似文献
2.
3.
4.
本文结合实际检测工作,根据JJG1059—1999《测量不确定度评定与表示》规范,要求对液相色谱仪紫外-可见光检测器最小检测浓度的测量结果进行了不确定度分析并得出结果。 相似文献
5.
6.
7.
正一、概述1.测量依据JJG705-2002《液相色谱仪检定规程》。2.环境条件温度为15℃~30℃,相对湿度为20%~85%。3.测量标准1×10-7g/mL的萘/甲醇溶液,不确定度为4%。4.被测对象液相色谱仪,定性RSD6不超过1.5%,定量RSD6不超过3.0%。5.测量方法用标准物质、微量进样器检测液相色谱仪最小检测质量浓度。二、测量模型1.概述选用C18反相色谱柱,以100%甲醇为流动相,流 相似文献
8.
9.
详细论述了用低浓度标准Cl离子溶液检测离子色谱仪最小检测浓度时的最小检测浓度测量不确定度评定方法. 相似文献
10.
11.
A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
12.
An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
13.
14.
15.
水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献
16.
17.
18.
19.
Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
20.
本文根据多年的实践检定经验 ,参照JJF1 0 59- 1 999《测量不确定度评定与表示》以及《测量不确定度表达 1 0讲》 ,对卧式金属罐容量的测量结果不确定度进行了评定。 相似文献