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1.
文章分析了碳排放在线检测中二氧化碳示值误差测得值的不确定度,充分考虑了重复测量的标准偏差、测量仪器的分辨力的量化误差、标准气体的额定值不确定度以及二氧化碳气源的流量波动等对二氧化碳示值误差测得值的影响,分析出二氧化碳示值误差测得值的相对扩展不确定度为0. 8%。  相似文献   

2.
本文对环境试验设备温度、湿度参数校准规范变更之后,温度均匀度、湿度均匀度测得值的不确定度评定方法进行了探讨,评定过程中考虑了通道之间的相关性影响.以PR205AF温湿度巡检仪测量美墨尔特HPP750恒温恒湿箱为例,温度均匀度测得值的扩展不确定度为0.3℃,湿度均匀度测得值的扩展不确定度为1.6%RH.  相似文献   

3.
温度是超低温冰箱最重要的参数,箱内温度是否有效直接影响到保存对象的质量。特别是医用超低温对冰箱内部温度的分布要求极其严格。本文给出了医用超低温冰箱温度分布特性分析方法,并针对医用超低温冰箱使用过程中空载和满载情况下箱内的温度分布特性进行了测试分析。结果证实了方法的有效性。同时,对开门后和开门恢复阶段箱体内部温度变化趋势进行了记录分析,并对断电保温效果进行了试验。为用户在操作过程中保证内部存储物的质量提供了有效支撑。  相似文献   

4.
本文分析了医用热力灭菌设备温度计温度示值误差的不确定度主要来源,介绍了医用热力灭菌设备温度计温度示值误差不确定度的评定步骤和方法,给出了评定结果。  相似文献   

5.
本文分析了医用注射泵流量基本误差测量值不确定度的主要来源,介绍了医用注射泵流量基本误差测量值不确定度的评定步骤和方法,给出了评定结果。  相似文献   

6.
为保证电磁流量计在测量过程中受液体温度、压力、流量等参数影响下测得值的准确、可靠,因此测得值的不确定度评定十分重要.本文依据国家检定规程JJG1033-2007《电磁流量计》,选取静态容积法水流量标准装置为测量装置,以DN100的电磁流量计为例,进行测得值的不确定度分析与评定.  相似文献   

7.
目的:为确认医用织物清洗消毒器消毒参数的有效性,保证良好的消毒效果.方法:按WS/T 508-2016《医院医用织物洗涤消毒技术规范》要求,设置医用织物清洗消毒器的消毒参数为80℃、10min,使用温度检测仪对其内部的温度、维持时间、A0值进行检测;根据检测结果调整设置程序参数,再进行验证试验.结果:医用织物清洗消毒器消毒参数调整前,其温度、维持时间达标率仅为66.7%、16.7%;消毒参数调整后,温度、维持时间的达标率均为100%.结论:宜定期使用温度检测仪对医用织物清洗消毒器消毒参数进行检测,确保实际运行参数准确可靠,保障医用织物的洗涤消毒质量.  相似文献   

8.
该文按照国家规范,详细展示了0. 5级数字压力计的示值误差测得值的不确定度评定方法,对于其他级别的数字压力计示值误差测得值的不确定度评定具有指导意义。  相似文献   

9.
外弹道参数天幕立靶测量误差分析   总被引:1,自引:0,他引:1  
为了分析外弹道参数天幕立靶的测量误差,评价测量参数的精确性,结合天幕立靶的测试原理和天幕结构,研究了误差产生的因素和误差传递关系,根据试验中测得的弹道参数时天幕立靶的测量误差进行了分析,从理论上计算了五个测量参数的误差范围.通过实弹试验,对天幕立靶测得的弹丸倾角、偏角以及着靶坐标与纸靶测得的参数进行了对比,对测得的速度参数进行了对比,数据基本吻合,天幕立靶测得的数据误差均在所分析的误差范围内.试验证明,天幕立靶是一种精度高,稳定可靠的测试仪器.  相似文献   

10.
电动汽车充电桩是用于贸易结算的计量器具,已列入市场监督总局发布的《实施强制管理的计量器具目录》中.目前充电桩正处于高速发展的时期,特别是需求旺盛的非车载充电机,其计量检定工作将逐步开展起来.本文分析了电动汽车非车载充电机示值误差测得值的测量不确定度,其主要来源于四个因素:测得值的重复性,检定装置的误差、数据修约和充电电缆电能损耗.  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
14.
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.  相似文献   

15.
由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。  相似文献   

16.
It is shown that conditions of attainment of marginal states in the material of structural components are formulated on the basis of analysis of force and deformation criteria of formation and development of destruction. The parameters of these criteria are data on types of structural materials, standard and special characteristics of their mechanical properties, structural forms of considered elements of the equipment, and their operating stress loading. In this case, the construction of a system of state equations for describing interrelation of current damage, external actions, and responses to them is based on the concept of calculating variations in properties of materials at all stages of the design life cycle.  相似文献   

17.
The article suggests a method of evaluating the microstructural inhomogeneity of deformation of metals by modeling. The method includes the measurement of deformations of metal according to meshes of a dividing grid with small base and the calculation of the distribution parameters of microdeformations in model representation. It is shown that the modeling method makes it possible objectively to evaluate the microinhomogeneity of deformation of metals independently of the chosen mesh size of the dividing grid. New structural characteristics are introduced: the base and wave of variation expressing the degree of crumbling or amalgamation of metal grains by inhomogeneity of deformation.Translated from Problemy Prochnosti, No. 7, pp. 40–44, July, 1991.  相似文献   

18.
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.  相似文献   

19.
20.
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)。  相似文献   

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