数字指示秤检定不确定度的计算

文章通过对涉及非自动秤检定装置中的数字指示秤检定的不确定度评定问题的分析、讨论，对测量不确定度的评定提出了自己的见解，具体地利用实例阐明了数字指示秤检定不确定度评定的方法，并对不确定度评定的步骤进行了详细的说明。     

电子汽车衡示值误差测量结果的不确定度分析

文章依据JJF1059-1999《测量不确定度评定与表示》对非自动秤检定装置中的电子汽车衡示值误差测量结果不确定度进行分析、讨论,利用实例提出了对电子汽车衡测量结果不确定度评定的方法,并对不确定度评定的步骤进行了详细的说明。     

数字指示秤示值误差测量值的不确定度评定

本文结合JJG539-97《数字指示秤》检定规程要求,分析了不确定度的来源因素,对数字指示秤示值误差测量结果的不确定度评定。     

工业二次仪表自动检定系统不确定度分析

测量不确定度是对测量结果的一种定量评定,正确理解、评定和表述测量不确定度是十分重要的。文章介绍了新型热电偶二次仪表自动检定系统的特点及测量不确定度的分析、评定方法及结果。     

电子秤化整前修正误差的测量不确定度评定

依据JJG539-1997《数字指示秤检定规程》检定电子秤(以下简称秤)；依据JJF1059-1999《测量不确定度评定与表示》评定被检秤化整前修正误差的不确定度。     

数字指示秤示值误差测量值的不确定度评定

本文根据数字指示秤检定规程要求,论述了数字指示秤的检定方法,对数字指示秤进行示值误差测量值的不确定度进行分析评定。     

30t非自行指示秤测量值的不确定度评定

本文介绍了依据JJG14-1997《非自行指示秤检定规程》对30t非自行指示秤进行检测时,其测量结果的不确定度评定方法,并给出了测量结果不确定度的报告与表示。     

浅谈数字指示秤不确定度评定中分辨力因素

数字指示秤不确定度评定中分辨力的评定。     

电子配料秤不确定度评定方法

在工程项目施工的过程中,配料秤能否正常工作,其计量是否准确和工程的质量有着直接的关系,因此说,在实际操作的过程中一定要采取有效的措施提升电子配料秤的精准度,并采取科学的措施对其不确定度进行有效的评定。下面本文就以电子配料秤不确定度评定问题为中心,结合工作实际,对具体的评定方法进行分析论述。     

测量不确定度应用中的若干问题

对于检定规程所附的不确定度评定，应是其检定项目中检定方法的不确定度评定，而不应是检定对象的测量不确定度评定。文章还就扩展不确定度与被测项目技术要求间的关系作了进一步论述，以此加深对不确定度的认识、理解和应用。     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

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.     

Analysis of the rate of propagation of the wave of change of boiling modes

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.     

可燃气体检测报警器测量结果的不确定度评定

本文详细介绍了可燃气体检测报警器示值误差测量结果的不确定度评定方法。     

水三相点复现的不确定度评定

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)。     

心电图机电压测量示值误差测量值的不确定度评定

本文介绍了心电图机电压测量示值误差测量值的不确定度评定与表示方法。     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

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.