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抗静电纺织品的测试标准浅析与探讨 总被引:1,自引:0,他引:1
杨金纯 《中国个体防护装备》2010,(5):38-41,10
本文阐述了目前抗静电纺织品的发展现状和主流开发技术路线,结合常用的纺织品抗静电性能测试方法和技术,浅析了目前我国的抗静电纺织品检测标准和方法,探讨了一些技术细节和常见问题。 相似文献
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Patrick Louchouarn Li-Jung Kuo Terry L. Wade Michele Schantz 《Atmospheric environment (Oxford, England : 1994)》2009,43(35):5630-5636
The present study tested the extraction efficiency and quantification reproducibility of anhydrosugars in a series of NIST SRMs using two extraction protocols and isotopically-labeled (d7-levoglucosan) vs. chemically analogous (sedoheptulosan) surrogates. In both instances, levoglucosan concentrations in the different versions of the Washington, D.C. urban dust standard (SRM 1649, 1649a, 1649b, and RM 8785) were similar. The present test also showed that levoglucosan concentrations were not affected by long-term shelf storage of dry material. Variability of analyses were similar for both surrogates and averaged <5%. Surrogate recoveries were shown to average 103 ± 7% and 97 ± 7% for d7-levoglucosan and sedoheptulosan, respectively. The choice of solvent was shown to affect recoveries the most (but not variability). Levoglucosan concentrations were either seriously underestimated or overestimated with ethyl acetate extraction when d7-levoglucosan or sedoheptulosan was used as surrogate, respectively. These results point to the need to use some fraction of polar solvent (i.e. methanol) in the solvent mixture. Anhydrosugar concentrations in the urban dust from the Czech Republic (candidate SRMs 2786 and 2787) were characterized by 3- to 7-fold higher anhydrosugar concentrations than those observed in the Washington, D.C. urban dust. The internal anhydrosugar signatures (i.e. levoglucosan/mannosan ratio: L/M) confirm the predominance of biomass combustion sources in both SRM series with mixed inputs from hardwood and softwood combustion in the Washington, D.C. urban dust and a predominantly softwood source in the Prague urban dust. The uniform distribution of anhydrosugars, across the particle size distribution of both SRM series, confirms earlier studies that low temperature charred materials contribute significant inputs to atmospheric ultrafine particles with long atmospheric residence time and transport ranges. 相似文献
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文章先是介绍了实验室检测的相关规定,即〈检验和校准实验能力认可准则在化学检测领域的应用说明〉,在此基础上,对可疑结果进行了定义,以及简单分析了如何判断出可疑结果,最后对处理可疑结果以及防御可疑结果的产生进行了分析探索,希望可以文章能有参考的价值. 相似文献
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通过实验证明使用低浓度的硫代硫酸的钠标液时,可用已配制标定好的硫代硫酸钠标准贮备液直接稀释使用,不需重新标定。此法切实可行,完全能满足样品分析的要求,既省时省力,又节约试剂,值得推广。 相似文献
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According to the current international standards, to perform the correct evaluation of the explosion and flammability parameters, a uniform distribution of the dust particles should be achieved inside the 20 L and/or 1 m3 standard vessels.CFD simulations have shown that in both standard test vessels (20 L and 1 m3), the dust particles are not uniformly dispersed, being mostly concentrated at the edge of the macro-vortices generated by the injection of the fluid and particle through the nozzle. In addition, only a partial fed of the particles is obtained, and dust particles sedimentation phenomena can occur.As a result, the dust participating to the reactive process may be much lower than the expected nominal concentration in the vessel due to sedimentation and incomplete feeding. Consequently, misleading values of the flammability/explosion parameters could be measured.Particle sedimentation and incomplete feeding depends both on the Stokes number and on the Reynolds number, whereas the concentration distribution depends on the turbulence level, the fluid flow maps, and the number of particles which enter into the vessel through the nozzle.The aim of this work is to evaluate the key parameters (particle size, particle density, and fluid velocity) affecting sedimentation and incomplete feeding in 20 L vessel. To this end, CFD simulations of dust dispersion are performed at varying the particle density and size. Operating maps, in terms of the key parameters and/or their dimensionless combinations, are developed and a correlation for correction of the data is proposed. 相似文献
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