共查询到20条相似文献,搜索用时 62 毫秒
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介绍了石油产品闪点测定的原理及主要方法,探讨了测定石油产品闪点的影响因素及测定石油产品的闪点在生产和应用中的重要意义。 相似文献
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《现代测量与实验室管理》2016,(2)
依据标准方法闪点的测定宾斯基-马丁闭口杯法对车用柴油闭口闪点进行测定。本文建立了闭门闪点测量不确定度的数学模型,分析了不确定的来源,计算了相对标准不确定度分量、合成标准不确定度和扩展不确定度。 相似文献
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李明罡 《中国新技术新产品》2022,(6):146-148
该文对可燃液体危险品提高闪点进行了试验研究。分析了水、正丙醇、乙二醇甲醚、二苯醚不同体积分数对乙醇溶液闪点的影响。试验结果表明以上4种添加剂加入乙醇溶液中都可以提高乙醇溶液的闪点,且添加剂的体积分数越大,二元混合溶液的闪点越高。闪点值越低,危险性就越大;闪点值越高,危险性就越小。所以向可燃液体中添加高闪点的溶液,可以提高可燃液体的闪点,从而降低可燃液体的危险性。 相似文献
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介绍了可燃液体闭口杯闪点的不同测试方法,比较分析了各测试方法测定的可燃液体闭口杯闪点值的差异。结果表明:测定表面不成膜样品的闭口杯闪点时,液体样品按照ASTM D6450-2016进行测试比较合适;黏稠液体样品建议按照ASTM D7094-2017a进行测试;膏体样品按照ASTM D56-2016或GB/T 21929-2008进行测试。对表面成膜的样品则建议使用在检测过程中带有搅拌功能的测试方法,一般液体或黏稠液体按照ASTM D7094-2017a进行测试;膏体样品按照ASTM D93-2016或GB/T 261-2008进行测试。 相似文献
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闪点是一个反映石油产品安全性的一个重要指标,其作用在于对石油产品容易导致火灾的危险性进行鉴定,本文阐述了闪点的测定的意义、原理,并对影响石油产品闪点测定准确性的因素进行了分析。 相似文献
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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
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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
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
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
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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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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