数字心电图机测量值的不确定度评定

依据JJG 1041-2008《数字心电图机检定规程》和JJF 1059.1-2012《测量不确定度评定与表示》提供的方法,主要通过幅度和时间参数测量两个方面对数字心电图机测量结果的不确定度进行评定。     

耐压测试仪示值误差测量值的不确定度评定

本文按JJG1059.1-2012《测量不确定度评定与表示》和CNAS-CL07:2011《测量不确定度的要求》对耐压测试仪示值误差测量结果的不确定度进行了评定。     

钠离子计电计示值误差和仪器示值总误差的测量不确定度评定

根据JJG1059-1999《测量不确定度评定与表示》、JJG822-1993《钠离子计的检定规程》和DL／T677-1999《火力发电厂在线工业化学仪表检验规程》，在检定钠离子计仪表时，对钠离子计电计示值误差和仪器示值总误差的不确定度进行分析和评定。     

瞳距仪示值误差测量结果的不确定度评定

本文按JJG1059-1999《测量不确定度评定与表示》和CNAS-CL07:2011《测量不确定度的要求》对瞳距仪示值误差测量结果的不确定度进行了评定.     

数字心电图机内定标电压与走纸速度的不确定度分析

一、内定标电压的不确定度分析1.概述(1)测量依据JJG1041-2008《数字心电图机检定规程》;JJF1059.1-2012《测量不确定度评定与表示》。(2)计量标准数字心电图机检定装置(幅度:0.1mV^5V;MPE:±0.5%)。(3)被检对象ECG-1350P型数字心电图机的内定标电压。(4)测量方法根据JJG1041-2008所规定的方法进行测量。     

1级材料试验机示值误差的测量结果不确定度

本文介绍了依据JJG139-1999《拉力、压力和万能材料试验机检定规程》或JJG157-1995《非金属拉力、压力和万能试验机检定规程》,采用直接测量法,按JJF1059-1999《测量不确定度评定与表示》对1级材料试验机示值误差的测量结果不确定度的分析方法.     

单相电子式电能表误差测量值的不确定度评定

本文依据JJG596-2012《电子式交流电能表》检定规程和JJG597-2005《交流电能表检定装置》检定规程对用户电能表进行检定并出示检定证书,按用户的特殊要求再依据JJF1059. 1-2012《测量不确定度评定与表示》对测得值的示值误差给出不确定度报告。     

普通水准标尺分米分划误差测得值不确定度评定

普通水准标尺主要应用于水准测量。本文依据JJG 8-1991《水准标尺检定规程》和JJF 1059. 1-2012《测量不确定度评定与表示》,建立相应的测量模型,分析了普通水准标尺分米分划误差测量不确定度的来源,对其测量不确定度进行评定。     

总磷在线自动监测仪示值误差不确定度评定

对JJG(苏)117-2010《总磷在线自动监测仪》中示值误差的测量不确定度进行评定[1]。分析了测量不确定度的来源,建立了数学模型,并对测量不确定度的各个分量进行计算,最后合成求出仪器示值误差的不确定度和扩展不确定度。     

出租汽车计价器使用误差的测量值的不确定度评定

本文依据JJG517-2009《出租汽车计价器》,对出租汽车计价器使用误差测量值的不确定度给出了评定,并写出不确定度报告。     

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.     

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.     

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。