扭矩扳子检定装置测量不确定度评定

结合扭矩扳子检定装置的建标工作,依据JJG707-2003《扭矩扳子检定规程》、GJB2749A-2009《军事计量测量标准建立与保持通用要求》、GJB3756-99《测量不确定度表示及评定》,对扭矩扳子检定装置的测量标准不确定度以及利用该装置检定4级扭矩扳子的测量结果不确定度进行了评定。     

扭矩扳子示值误差的测量结果不确定度评定

通过使用扭矩扳子检定装置对准确度等级为1级的数显式扭矩扳子进行检定校准,提出了扭矩扳子示值误差的测量,结果不确定度的影响量,并给出了测量结果不确定度的评定和计算方法。     

扭矩扳手示值误差测量不确定度评定

依据JJG707-2014《扭矩扳子》检定规程和JJF1059.1-2012《测量不确定度评定与表示》,结合实际校准工作,对扭矩扳子测量值的不确定评定具有参考意义。     

扭矩扳子检定装置的建立及不确定度评定

本文依据JJG707-2003扭矩扳子检定规程,建立了扭矩扳子检定装置,根据不确定度评定方法,对此计量标准的测量结果进行了不确定度评定并进行了验证。     

扭矩扳子检定装置测量不确定度评定

本文介绍了用扭矩扳子检定装置对扭矩扳子示值误差进行检定的测量不确定度的评定过程。     

扭矩扳子示值误差的测量结果不确定度

本文就本所的扭矩扳子检定仪,结合JJG707-2003《扭矩扳子检定规程》的要求,对扭矩扳子示值误差测量结果的不确定度进行评定。     

扭矩扳子校准结果的测量不确定度评定

本文介绍了运用不确定度传播法(即GUM法)来评定扭矩扳子示值误差测量不确定度的方法,评定的过程考虑了转接头引入的不确定度分量。     

数字式扭矩扳手测量结果的不确定度评定

本文阐述了数字式扭矩扳子检定仪测量结果的不确定度评定方法和步骤。     

扭矩板子测量结果的不确定度评定

本文结合检定工作实际经验,提出了对扭矩扳子测量结果的不确定度评定方法。     

预置式扭矩扳子示值误差测量结果的不确定度评定

文章介绍了机械预置式扭矩扳子示值误差测量结果不确定度的分析和评定方法。     

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。