电子停车计时收费表停车计时误差测量不确定度评定

根据国家检定规程和测量不确定度评定规范,对电子停车计时收费表停车计时误差进行测量不确定度的评定和分析。     

停车场电子计时收费装置计时误差检定及不确定度评定

本文介绍了停车场电子计时收费装置主要参数计时误差的检定方法,并对其测量不确定度进行评定。     

电话计时计费装置测量结果不确定度评定

采用比较测量法检定电话计时计费装置计时误差,可以减小计时计费装置分辨力误差引入不确定度,大大减小测量结果不确定度。当电话计时计费装置计时到整数时间时,触发电话计时计费检定仪,停止电话计时计费装置计时,读取电话计时计费检定仪标准值和电话计时计费装置的测量值,得出被检电话计时计费装置计时测量误差,评定测量结果不确定度,为电话计时计费装置的计时基本误差的检定提供依据。     

停车场计时计费装置测量值的不确定度评定、

本文结合实际检定工作,提出了对停车场计时计费装置测量结果的不确定度评定方法,为检定工作提供科学保障。     

程控交换机计时计费装置测量结果的不确定度评定

通过对程控交换机计时计费装置在不同的条件下进行检定．对不同的检定条件对程控交换机计时计费装置测量结果的不确定度进行评定。找出影响程控交换机计时计费装置测量结果的原因．目的为提高程控交换机计时计费装置测量结果的准确率。     

集中管理集中计费型电话计时计费装置测量结果的不确定度评定

本文结合实际检定工作,提出了对集中管理集中计费型电话计时计费装置测量结果的不确定度评定方法,为检定工作提供科学保障.     

电能表日计时误差测量结果的不确定度评定

随着社会用电量的不断增大,为提高用电效率,改善用电量不均衡的现象,国内各省市的电力部门大量使用了具有分时计量功能的复费率(多功能)电能表。复费率(多功能)电能表时钟的准确性问题,成为了分时计量关注的焦点。计量检定机构采用检定电能表的日计时误差,来作为判定复费率(多功能)电能表时钟是否符合要求的依据。因此,有必要对电能表日计时误差测量结果的质量进行评定,也就是对日计时误差的测量结果做出不确定度评定。     

电子停车计时收费表检定/校准测量不确定度

本文对电子停车计时收费表检定/校准测量值的不确定度进行了分析技术,给出测量值的扩展不确定度。     

IC卡公用电话计时计费装置不确定度的评定

本文介绍了IC卡公用电话计时计费装置的不确定度评定.     

出租汽车计价器本机计时测量结果不确定度分析

本文对出租车计价器本机计时误差的测量结果的不确定度进行了分析,计算出了合成标准不确定度及扩展不确定度,为出租汽车计价器的检定提供了可靠的依据。     

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.