婴儿培养箱的校准方法与质量控制

正一、婴儿培养箱的计量性能应符合JJF1260-2010《婴儿培养箱校准规范》的要求,如表1所示。二、校准用标准器和其他辅助设备(见表2)三、校准方法与质量控制下面以CDBI-3000型婴儿培养箱检测采集系统为校准标准介绍校准与质量控制方法。1.报警功能及电气安全检查(1)报警功能检查将婴儿培养箱设为启动状态,人为阻塞婴儿培养箱的出风口处和进风口处后,培养箱应能发出相应的     

婴儿培养箱温度偏差测量不确定度评定及CMC表示

本文通过实例,对婴儿培养箱温度偏差测量不确定度进行评定,以及对如何进行婴儿培养箱温度偏差校准和测量能力(CMC)的表示,做了阐述。对于实验室申报校准能力时,如何评定与表示,具有指导与借鉴作用。     

用Excel表格处理婴儿培养箱温度校准中的数据

婴儿培养箱温度校准中需要处理的数据较多,工作量较大。利用Excel表格的计算功能,能准确快速的得到校准结果。文章介绍了一种利用Excel表格处理婴儿培养箱温度校准数据的方法。     

基于Wifi传输的无线婴儿培养箱自动校准装置

Wifi传输的无线婴儿培养箱自动校准装置通过采用触摸屏,温湿度、含氧量、噪声传感器,电源等硬件结合软件程序,实现对婴儿培养箱的校准。     

婴儿培养箱校准和性能的探讨

为了提高婴儿培养箱环境条件测量的准确性、可靠性和安全性,从婴儿培养箱的工作原理出发,对校准的婴儿培养箱温度、湿度等的变化及差异性进行分析。方法采用计量标准对婴儿培养箱自身温度、湿度、噪声进行实时自动监测,记录不同品牌不同型号的婴儿培养箱温度变化数据,并与婴儿培养箱自身箱体显示参数进行对比、分析。通过实际工作中对大量婴儿培养箱的校准后,能够对关键技术指标存在的问题给出合理建议,提高婴儿医疗的安全性,减少不良事件的发生。     

婴儿培养箱部分校准项目的探讨

本文介绍了婴儿培养箱的结构和运行原理,并依据JJF1260—2010《婴儿培养箱校准规范》,对部分校准项目进行深入解读和补充,给并出操作指南和注意事项。     

婴儿培养箱温湿度偏差及噪声测量值的不确定度评定

根据校准规范和日常校准工作,本文分析了婴儿培养箱温湿度偏差以及噪声测量不确定度的主要来源,评估了温湿度分辨力分别为0.1℃和1%RH的婴儿培养箱的合成不确定度和扩展不确定度。     

婴儿培养箱温度偏差与湿度偏差的不确定度评定

依据JJF1260-2010《婴儿培养箱校准规范》,分析了婴儿培养箱温度偏差与湿度偏差的标准不确定度和合成不确定度。     

婴儿培养箱校准规范部分计算公式的理解及巧用EXCEL计算其结果

本文根据JJF1260-2010《婴儿培养箱校准规范》,举例对婴儿培养箱温度偏差、温度均匀度、温度波动度项目就笔者的理解进行进行实例计算。     

婴儿培养箱校准问题及对策

对目前市场上常用的婴儿培养箱分析仪进行比较,分析了多种校准设备的优缺点,并就未来的改进方向提出看法;文章还对婴儿培养箱校准过程中,经常出现的接地电阻超差、断电无报警故障、温度均匀度超差及温度偏差超差等问题进行分析,并提出了解决方法与建议。     

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.     

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.     

空压机轴承箱蜗壳温度探头油封改造

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。     

Characteristics of mechanical properties of materials in studies of conditions of attainment of marginal states

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.     

Determination of parameters of microstructural inhomogeneity of deformation of metals by the method of modeling

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.     

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.     

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)。