A bread-and-butter model was proposed to evaluate the weighing uncertainty of gas standard materials by combining the preparation principles of gas standard materials by using weighing method with the differential alg...A bread-and-butter model was proposed to evaluate the weighing uncertainty of gas standard materials by combining the preparation principles of gas standard materials by using weighing method with the differential algorithms of multivariate function.The model was applied to calculate the content of CO in 10 μmol/mol CO standard materials prepared by weighing method and to evaluate its weighing uncertainty.The evaluation processes are simple and the result is reasonable.This modle is suitable for the evaluation of the uncertainty of gas standard materials in industrial processes.展开更多
利用被测砝码和参考砝码在2种不同密度的空气介质中比较称量时,砝码间的质量差与空气密度差成线性变化这一特性,通过最小二乘法拟合质量差随空气密度差变化的曲线,提出了空气中双称量法砝码体积测量方法。基于空气中双称量法砝码体积测...利用被测砝码和参考砝码在2种不同密度的空气介质中比较称量时,砝码间的质量差与空气密度差成线性变化这一特性,通过最小二乘法拟合质量差随空气密度差变化的曲线,提出了空气中双称量法砝码体积测量方法。基于空气中双称量法砝码体积测量数学模型和测量装置工作原理,分析影响测量结果的3个主要因素:2次测量的大气压变化范围,砝码表面解吸作用和质量比较仪计量特性。以10 g^1 kg OIML不锈钢砝码为例,将该方法测得的体积与液体静力比较法的测量结果比对,E n值评定结果小于1。展开更多
Water content/Water dew point is an important index in controlling the quality of merchandise natural gas.This paper describes the method of using absorptiometry to measure the water content in natural gas,reviews its...Water content/Water dew point is an important index in controlling the quality of merchandise natural gas.This paper describes the method of using absorptiometry to measure the water content in natural gas,reviews its accuracy and repeatability,and tests the method by analyzing a real sample,which shows that the measuring spectrum of the water content by this method could be over 100mg/m3,by which the relative measurement error is +5% or 5mg/m3.展开更多
文摘A bread-and-butter model was proposed to evaluate the weighing uncertainty of gas standard materials by combining the preparation principles of gas standard materials by using weighing method with the differential algorithms of multivariate function.The model was applied to calculate the content of CO in 10 μmol/mol CO standard materials prepared by weighing method and to evaluate its weighing uncertainty.The evaluation processes are simple and the result is reasonable.This modle is suitable for the evaluation of the uncertainty of gas standard materials in industrial processes.
文摘利用被测砝码和参考砝码在2种不同密度的空气介质中比较称量时,砝码间的质量差与空气密度差成线性变化这一特性,通过最小二乘法拟合质量差随空气密度差变化的曲线,提出了空气中双称量法砝码体积测量方法。基于空气中双称量法砝码体积测量数学模型和测量装置工作原理,分析影响测量结果的3个主要因素:2次测量的大气压变化范围,砝码表面解吸作用和质量比较仪计量特性。以10 g^1 kg OIML不锈钢砝码为例,将该方法测得的体积与液体静力比较法的测量结果比对,E n值评定结果小于1。
文摘Water content/Water dew point is an important index in controlling the quality of merchandise natural gas.This paper describes the method of using absorptiometry to measure the water content in natural gas,reviews its accuracy and repeatability,and tests the method by analyzing a real sample,which shows that the measuring spectrum of the water content by this method could be over 100mg/m3,by which the relative measurement error is +5% or 5mg/m3.
