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针对一起GIS气室中SF6气体纯度不合格的检测案例,分析造成气体纯度不合格的可能原因,并提出防范措施. 相似文献
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在有机溶剂体系中,利用微波催化苯甲醛、吡咯合成四苯基卟啉。最佳反应条件为:二甲苯溶剂100ml,对硝基苯甲酸催化剂1.8g,苯甲醛0.02mol、吡咯0.02mol,微波功率210W,辐射时间15min,产率达到52 9%,经重结晶,双组分紫外光谱法测定四苯基卟啉纯度达96%。 相似文献
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本文用现象学的研究方法探讨原型理论在如下几个方面的缺陷:(1)在语义研究中,原型成员不能涵盖全部语义,原型效应有时在反义词中得不到体现;(2)在某些范畴内,中心成员难以确定;(3)家族相似性有程度大小的差异,其界定天然地受到模糊性的限制,同时还受主现因素的影响;(4)原型理论尚未明确指出范畴化中原型效应的形成机制,本文分析指出其可能是复现率、发生率以及长时记忆等多种因素共同作用所致. 相似文献
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论述了SF6气体纯度检测的必要性及目的,通过实例检测,说明应用现有变压器油色谱分析仪检测出SF6气体中的N2和O2组分含量,从而估算SF6气体纯度方法的可行性,对基层开展SF6气体纯度的检测不失为一种有益的补充,具有很高的实际应用价值. 相似文献
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中国石化润滑油北京有限责任公司(以下简称润滑油北京有限公司)主要从事润滑油的生产,是中国石化专业化润滑油公司,生产内燃机油、齿轮油、液压油、汽轮机油、变压器油、压缩机油等500余个品种、各种规格型号的"长城"牌润滑油产品. 相似文献
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A 1.3 μm two-section multi-quantum well reflective semiconductor optical amplifier is designed and fabricated.The impacts of injection current density ratio and the reflectivity of the reflective facet on gain,saturation and noise characteristics are studied theoretically and experimentally.The results indicate that the gain and saturation power can be easily manipulated by changing the current density ratio;and better gain and noise characteristics can be obtained when the reflectivity is appropriately selected. 相似文献
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A simple and cost-effective remodulation scheme using a two-section reflective semiconductor optical amplifier (RSOA) is proposed for a colorless optical network unit (ONU). Under proper injection currents, the front section functions as a modulator to upload the upstream signal while the rear section serves as a data eraser for efficient suppression of the downstream data. The dependences of the upstream transmission performance on the lengths and driven currents of the RSOA, the injection optical power and extinction ratio of the downstream are investigated. By optimizing these parameters, the downstream data can be more completely suppressed and the upstream transmission performance can be greatly improved. 相似文献
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