液相色谱-原子荧光联用仪最小检测量不确定度评定

本文根据JJG 1151-2018《液相色谱-原子荧光联用仪检定规程》和JJF 1059. 1-2012《测量不确定度的评定与表示》,分析了各不确定度分量,建立了评定最小检测量不确定度的测量模型,评定了液相色谱-原子荧光联用仪最小检测量的不确定度。     

鱼粉中甲基汞的测定

通过两种色谱柱的选择,采用原子荧光-液相色谱联用仪对鱼粉中甲基汞进行测定,寻找最佳的色谱柱与流动相相匹配、改进前处理方法,获得正确的实验结果。     

液相色谱-质谱联用仪校准方法探讨

液相色谱-质谱联用仪是将液相色谱仪与质谱仪通过一定接口耦合到一起的分析仪器,它既能用于定性分析又能用于定量检测,在有机化学、生物化学、石油化工、环境保护、食品安全、农业科学、生命科学、医药卫生等领域都得到了广泛的应用。为了保证液相色谱-质谱联用仪测量结果的准确统一,需要对液相色谱-质谱联用仪进行定期校准。目前,我国没有液相色     

食品检验中测定质控样糙米粉无机砷含量的不确定度评定

通过液相色谱-原子荧光光谱联用仪对质控样糙米粉中的无机砷进行测定,并对其测量不确定性进行评定。结果显示糙米粉中无机砷的含量为0.15 mg/kg,其扩展不确定度为0.014 mg/kg;证书提供的标准值区间为0.12～0.18 mg/kg,测定结果在标准值区间内。     

液相色谱-质谱联用仪信噪比测量结果的不确定度评定

本文依据JJF1317-2011《液相色谱-质谱联用仪》校准规范,介绍了液相色谱-质谱联用仪信噪比测量结果的不确定度评定,并给出其扩展不确定度,以便使用者可以正确的利用测量结果。     

气相色谱三重四极杆质谱联用仪校准实例

本文通过参考JJF 1164—2006台式气相色谱-质谱联用仪校准规范,制定了配置电子轰击(EI)源的气相色谱-串联质谱仪校准方法,详述了按照此方法对美国热电公司生产的TSQ8000三重四极杆气相色谱质谱联用仪进行校准的过程,供广大计量检定人员参考。     

液相色谱-原子荧光联用仪(LC-AFS)测试方法探讨

液相色谱-原子荧光联用仪(LC-AFS)主要用于砷、汞等有毒有害元素及其化合物的形态分析检测,目前尚没有LC-AFS测试的标准方法,本文对LC-AFS联用技术进行了简要概述,探讨了该仪器检出限、重复性和测量线性的测量方法,并进行了实验验证,为该类仪器的测试提供了方法,保证了仪器量值的准确性。     

液相色谱-质谱联用仪校准中主要技术问题的探讨

液相色谱-质谱联用仪测量原理复杂，技术先进，要保证该类仪器校准结果的准确性和溯源性，同时判断仪器是否符合校准规范要求，计量校准人员需具备一定的技术水平。本文根据液相色谱-质谱联用仪的测量原理，阐述校准前的准备工作，探讨校准中出现的主要问题及解决方法。     

采用新液相色谱仪检定规程检定荧光检测器

本文详细描述了Agilent 1100型号荧光检测器按照新液相色谱检定规程JJG705-2014要求进行仪器检定的过程,以供广大检定员参考。     

液相色谱-质谱联用仪质量准确性测量结果不确定度的评定

JJF 1317—2011液相色谱-质谱联用仪校准规范仅给出了信噪比的不确定度评定示例,而现有文献关于液相色谱-质谱联用仪校准时,质量准确性不确定度的评定及相关研究较少。其中一个难点在于理论值引入的不确定度,文章介绍了一种理论值引入的不确定度评定方法,通过举例说明该方法的适用性。     

方波幅度的测量不确定度

介绍了用众数法评价方波幅度时的不确定度分析和评价过程;讨论了主要的不确定度来源,包括众数判别区间的影响、波形测量系统幅度测量误差的影响等等;给出了减小不确定度的主要措施,并结合一个实例,给出了方波幅度的不确定度评价结果。     

Assurance of the Uniformity of Measurements of the Power of Laser Radiation

On the basis of an analysis of the principle underlying the construction of standards and systems designed for reproduction of the unit of mean power and energy of laser radiation, it is shown that these standards consist of unified subsystems that carry the principal metrological load. By means of such a division, it is possible to realize a systems-engineering synthesis of standards with preassigned error. __________ Translated from Izmeritel'naya Tekhnika, No. 11, pp. 20–23, November, 2005.     

Dependence of topology of surface of model of a complex system on the state of its individual elements

A method of determining the stresses that arise in individual elements of a complex system and that lead to deformation of these elements is proposed. Using the proposed method, the relationship between the topology of a surface of an object, the deforming load, and the interference pattern is established. __________ Translated from Izmeritel’naya Tekhnika, No. 3, pp. 35–38, March, 2007.     

Analysis of the specific features of loading of the elements of landing gears of aircrafts aimed at the evaluation of the load-bearing capacity of the structure

We propose a computational scheme of the aircraft nose landing gear and perform the analysis of weak sections in the landing-gear lever by the finite-element method. We determine the loading modes in which the landing-gear lever is subjected to disproportional cyclic loads, which should be taken into account in the evaluation of the service life and determination of the properties of applied materials. __________ Translated from Problemy Prochnosti, No. 4, pp. 87–93, July–August, 2008.     

Assurance of the Uniformity of Measurements of Energy of Short-Pulse Coherent Radiation

Ways of creating unified automatized reference (calibration) and standard measurement equipment for the purpose of developing a subsystem for the assurance of the uniformity of measurements of the energy of short-pulse laser radiation are considered. __________ Translated from Izmeritel'naya Tekhnika, No. 11, pp. 24–28, November, 2005.     

一起空分设备主换热器过冷故障的分析

在KDON-6000/3500型空分设备调试过程中,由于经验不足、操作不当,造成主换热器发生过冷故障。停运一台膨胀机,采用液氧返充操作使空分设备恢复正常工况。介绍故障发生经过和原因分析过程,以及防止同类故障再次发生的预防措施。     

一起珠光砂堵塞过冷器的故障处理

在KDON-4500/4500-3型空分设备精馏塔大加温过程中发生管道断裂故障,珠光砂进入纯氮通道堵塞过冷器并造成空分设备停车。介绍为排除故障而对过冷器进行正、反向吹扫的管线流程。阐述了为避免同类故障再次发生,对冷箱内管道、支架所作的改进措施以及精馏塔加温吹扫的优化操作。     

某型直升机旋翼轴载荷测试方法研究

某型直升机旋翼轴是驱动旋翼旋转的关键疲劳部件,本文主要介绍了对该型直升机主旋翼轴载荷的测试方法:应变片的选择及测点布置,测试原理,测试结果及分析.     

Assessment of the cause of cracking of hydraulic hose clamps

The aim of this study was to determine the cause of failure of the shells of hydraulic hose crimped fittings. For the purpose of examination the damaged crimped shells, undamaged crimped shells and shells prior to crimping were used. Fractographic and metallographic analysis, including chemical microanalysis of inclusions, were performed to determine the cause of failure. For this investigation, optical and scanning electron microscopes and hardness measurement were used. Damaged crimped shells contained higher amount of inclusions compared to undamaged crimped shells and substantially differed in microstructure and hardness. Furthermore, different geometry of the cross section at outer edge containing more effective stress concentrators was observed on failed crimped shells. Based on microstructural observation in cross section, hardness measurements and analysis of inclusions, the conclusion is that cracking of the shells occurred mainly due to deviations in the manufacturing process, combined with lower quality of shell material. Modifications to the technology were suggested to prevent this kind of failure.