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介绍了自然环境试验的概念及开展自然环境试验的目的和意义,给出了在热带条件下战术电台的自然环境试验总体方案,列举了自然环境试验与实验室试验的区别和联系,最后对进行自然环境试验应注意的问题进行了阐述。 相似文献
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测量审核和实验室间比对是能力验证计划的有效补充形式,是实验室或者检查机构用于实验室质量控制及申请CNAS认可的重要手段。本文随机抽取2010年~2012年低温试验测量审核与高温试验实验室间比对结果为不满意的报告各8份作为样本,进行原因分析,并给出技术建议,旨在让参加实验室在以后的相关试验中能规避常见问题,提高测试能力。 相似文献
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简要介绍了在水中矿物油的测定过程中,无水硫酸钠铺垫厚度对石油醚萃取液脱水过滤速度及水样测定结果的影响,得出了水样污染越重,石油醚萃取液中含的水份越多,无水硫酸钠铺垫厚度应适当加厚,但测定结果仍满足环境监测要求的结论。 相似文献
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罗国兵 《中国环境管理干部学院学报》2013,(3):9-12,51
在水质检测工作中,质量控制方法是确保检测数据准确的一种重要手段。当前水质检测实验室中常用的质控手段有盲样考核、平行测定、加标回收、比对试验、期间核查、相关性分析与质量监督六类,通过分析比较这些质控手段在分析检测中的差异及其对检测结果的影响,为提升水质检测工作质量,出具科学、公正的检测报告提供保障。 相似文献
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Michael L. Shrader Richard H. McCuen Walter J. Rawls 《Journal of the American Water Resources Association》1980,16(1):49-55
ABSTRACT: With the increased use of models in hydrologic design, there is an immediate need for a comprehensive comparison of hydrologic models, especially those intended for use at ungaged locations (i.e., where measured data are either not available or inadequate for model calibration). But some past comparisons of hydrologic models have used the same data base for both calibration and testing of the different models or implied that the results of model calibration are indicative of the accuracy at ungaged locations. This practice was examined using both the regression equation approach to peak discharge estimation and a unit hydrograph model that was intended for use in urban areas. The results suggested that the lack of data independence in the calibration and testing of regression equations may lead to both biased results and misleading statements about prediction accuracy. Additionally, although split-sample testing is recognized as desirable, the split-samples should be selected using a systematic-random sampling scheme, rather than random sampling, because random sampling with small samples may lead to a testing sample that is not representative of the population. A systematic-random sampling technique should lead to more valid conclusions about model reliability. For models like a unit hydrograph model, which are more complex and for which calibration is a more involved process, data independence is not as critical because the data fitting error variation is not as dominant as the error variation due to the calibration process and the inability of the model structure to conform with data variability. 相似文献
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目前,筛选试验中振动应力量值选取大多采用GJB推荐值,而不同产品有其不同动力学特性,从而很难保证各类产品都达到强筛选效果.针对这种不足,本文提出一种根据产品实测响应而确定振动量级的新方法,并以电子组件为例,给出具体的实施方法及操作过程中诸多问题的解决办法.实践证明本方法具有推广价值. 相似文献
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选取某飞机铝合金/高强度钢连接件开展西沙暴露试验,掌握连接件腐蚀变化趋势。结果表明,连接件保护涂层耐老化性能良好,采用湿装配有效避免了电偶腐蚀和缝隙腐蚀,连接件背面螺栓、螺母和铆钉(30CrMnSiA,表面镀镉)为其腐蚀薄弱环节,需加强防护。 相似文献