谈谈计量标准考核的稳定性与重复性及测量不确定度

<正>一、引言JJF1033-2008《计量标准考核规范》从2008年9月开始实施,但在执行过程中还存在部分计量标准考评员仍按JJF1033-2001的要求来执行,没有认真执行JJF1033-2008的现象。由于计量标准考评员掌握计量标准考核尺度的偏离,造成不少计量技术机构在计量标准考核时无所适从。本文就JJF1033-2008中对计量     

《计量标准考核规范》修订解读

<正>2016年11月30日,《国家质检总局关于发布〈海洋倾废记录仪检定规程〉等32个国家计量技术规范的公告》(质检总局公告[2016]第119号),发布了JJF1033-2016《计量标准考核规范》(以下简称"新规范"),代替JJF1033-2008《计量标准考核规范》(以下简称"原规范"),新规范自2017年5月30日     

基于JJF1033的分布式应用系统在计量标准管理中的研究与实现

本文深入研究了JJF 1033-2008《计量标准考核规范》在计量标准管理工作中的应用。通过对JJF1033的剖析,将具体的考核要求抽象为电子化的数据模型,并引入分布式应用系统,使计量标准管理工作成为一项全员参与的质量管理工作。分布式应用系统和计量标准管理与JJF1033考核要求相结合,是本文两大亮点。     

《计量标准考核规范》修订说明

国家计量技术规范《计量标准考核规范》JJF1033—2008于2008年1月31日经国家质量监督检验检疫总局批准发布,并于2008年9月1日起施行。JJF1033—2008是对JJF1033～2001的修订。     

计量标准器稳定性考核图表的制作

一、引言2008年1月31日发布的JJF1033-2008《计量标准考核规范》(以下简称"新规范")代替了JJF1033-2001《计量标准考核规范》(以下简称"旧规范")。新规范的     

四川省计量协会活动园地

正(1)各市州法定计星检定机构和省级授权计量检定机构的计量标准二级考评员和法定计量检定机构考评员于2014年4月15日至16日在成都接受JJF1033-2008《计量标准考核规范》,JJF1069-2012《法定计量检定机构考核规范》的培训、考核。县级计量检     

JJF1033-2008《计量标准考核规范》发布

1月31日,JJF1033-2008《计量标准考核规范》国家计量技术规范经国家质检总局批准发布,并将于2008年9月1日起施行。     

对计量标准考核要求之浅见

计量标准是准确度低于计量基准,用于检定或校准其他计量标准或工作计量标准的计量依据,它处于国家量值传递(溯源)体系的中间环节,起承上启下的作用。计量标准考核既是计量监督的一项基本内容,也是实施《中华人民共和国计量法》的重要技术基础。JJF1033-2008《计量标准考核规范》由国家质量监督检验检疫总局于2008年9月1日起开始实施,适用于新建计量标准的考核、已建计量标准的考核以及计量标准考核的监督管理。     

对计量标准考核要求的理解与执行

JJF1033-2008《计量标准考核规范》由国家质量监督检验检疫总局于2008年1月31日发布,2008年9月1日起开始实施,其目的是为了加强计量标准的管理,进一步规范计量标准的考核工作,保障国家计量单位制的统一和量值传递的一致性、准确性,为国民经济和社会发展以及计量监督管理提供准确的检定、校准数据或结果。其依据是《中华人民共和国计量法》、《计量标准考核办法》的有关规定,并参照国际法制计量组织(OIML)对计量标准的要求。适用于新建计量标准的考核、已建计量标准的考核以及计量标准考核的监督管理。     

计量标准复查考核前的准备

<正>按照JJF1033-2008《计量标准考核规范》的规定,已建计量标准每隔四年应进行一次复查考核。如何使计量标准能够满足JJF1033-2008的要求,顺利通过复查考核,笔者从工作实践中体会到做好以下几个方面的工作较为关键:一、修订计量标准技术报告计量标准技术报告是计量标     

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.     

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.     

Assessment of intakes of mixtures of radionuclides

Australia has several uranium mines and a large number of mineral sand mines, with associated processing facilities. Exposures resulting from these mining and processing operations usually involve intakes of mixtures of radionuclides. This work describes the development of a suite of first order, linear compartment models, based on the ICRP Publication 66 respiratory tract model, and an analytical solution to the decay equations, for assessing the consequences of such intakes. The computer programs based on these models directly compute excretion, organ retention and organ and whole-body doses for intakes of either single radionuclides or any mixture of radionuclides belonging to the same radioactive decay chain. The intake can be via inhalation, ingestion or injection, and can be acute, chronic or of limited duration. The starting concentration and degree of secular (dis)equilibrium can be specified for each radionuclide. No assumptions need to be made about the relative magnitudes of the radioactive half-lives of the different nuclides.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

卧式金属罐容量的测量结果不确定度

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。     

盐酸浓度不确定度的评估

通过对盐酸浓度标定的过程分析，找出影响结果的各个分量，进行不确定度的评定，按照计量技术规范给出标准的表示法。     

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.