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高分子材料湿度含量对其力学性能的影响的实验研究 被引量:7
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作者 郑高飞 亢一澜 +1 位作者 富东慧 王怀文 《实验力学》 CSCD 北大核心 2003年第1期23-28,共6页
本文从实验的角度对湿度因素影响下的高分子聚合物材料的力学性能进行了研究,选用了尼龙6材料进行了一系列的有关湿度实验.通过不同含湿率下与时间相关的材料性能实验首次从实验上证明高分子聚合物材料存在湿度-时间等效性,即对材料力... 本文从实验的角度对湿度因素影响下的高分子聚合物材料的力学性能进行了研究,选用了尼龙6材料进行了一系列的有关湿度实验.通过不同含湿率下与时间相关的材料性能实验首次从实验上证明高分子聚合物材料存在湿度-时间等效性,即对材料力学性能而言延长作用时间与增加材料含湿率是等效的,并且具体给出了尼龙6材料的湿度-时间等效关系,如该材料在不同含湿率下的广义曲线.本文工作为进一步研究湿度因素影响下的材料性能提供了实验依据. 展开更多
关键词 湿度因素 湿度-时间等效性 高分子聚合材料力学性能
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检验仪器环境性故障3例 被引量:1
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作者 苑庆举 《医疗设备信息》 2004年第6期79-79,共1页
关键词 检验仪器 环境性故障 温度因素 湿度因素 灰尘因素 检查 维修
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夏季不适合做激光视力矫正?
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《家庭医药(就医选药)》 2004年第7期1-1,共1页
关键词 夏季 激光视力矫正术 手术效果 温度因素 湿度因素 上角膜
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掌握好溶冰时间
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作者 高轩 《陕西气象》 1998年第4期31-31,共1页
关键词 溶冰 风速 地面气象观测 观测规范 平均值 湿度因素 实际应用 基本规定 凤翔县 空气湿度
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Modeling Relative Humidity Effects on Power Electronic Performance
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作者 R. Ciprian B. Lehman 《Journal of Energy and Power Engineering》 2011年第7期632-640,共9页
Variations in the behavior of power supplies caused electrical behavior dependence with environmental conditions. by environmental conditions require accurate characterization of the This paper introduces models to he... Variations in the behavior of power supplies caused electrical behavior dependence with environmental conditions. by environmental conditions require accurate characterization of the This paper introduces models to help predict relative humidity (Rtt) and other environmental factors influence on sensitive circuitry in power electronic systems. The resistivity and permittivity of an insulator have been modeled using different water contents i.e. RH, such model also included the mechanical properties of the design. An application example of a high power density, high voltage DC-DC converter is used to verify the results. 展开更多
关键词 Power electronics insulator resistivity relative humidity insulator permittivity modeling.
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Analysis of long-term variations of fog and haze in China in recent 50 years and their relations with atmospheric humidity 被引量:79
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作者 DING YiHui LIU YanJu 《Science China Earth Sciences》 SCIE EI CAS 2014年第1期36-46,共11页
Our analysis of fog and haze observations from the surface weather stations in China in recent 50 years (from 196l to 2011) shows that the number of fog days has experienced two-stage variations, with an increasing ... Our analysis of fog and haze observations from the surface weather stations in China in recent 50 years (from 196l to 2011) shows that the number of fog days has experienced two-stage variations, with an increasing trend before 1980 and a decreasing trend after 1990. Especially, an obvious decreasing trend after 1990 can be clearly seen, which is consistent with the decreas- ing trend of the surface relative humidity. However, the number of haze days has demonstrated an increasing trend. As such, the role of reduction of atmospheric relative humidity in the transition process from fog into haze has been further investigated. It is estimated that the mean relative humidity of haze days is about 69%, lower than previously estimated, which implies that it is more difficult for the haze particles to transform into fog drops. This is possibly one of the major environmental factors leading to the reduction of number of fog days. The threshold of the relative humidity for transition from fog into haze is about 82%, also lower than previously estimated. Thus, the reduction of the surface relative humidity in China mainly due to the in- crease of the surface temperature and the saturation specific humidity may exert an obvious impact on the environmental con- ditions for the formations of fog and haze. In addition, our investigation of the relationship between haze and visibility reveals that with the increase of haze days, the visibility has declined markedly. Since 1961, the mean visibility has dropped from 4-10 to 2-4 kin, about a half of the previous horizontal distance of visibility. 展开更多
关键词 fog and haze VISIBILITY relative humidity transition from fog into haze
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