排序方式: 共有43条查询结果,搜索用时 12 毫秒
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烟气中二氧化硫及三氧化硫测定方法的研究 总被引:2,自引:0,他引:2
本文采用过氧化氢-氯化钡-钍试剂法以及80%异丙醇-氯化钡-钍试剂法分别测定了烟气中的二氧化硫及三氧化硫质量浓度,并对该方法的灵敏度、准确度以及各种影响因素进行了研究分析.本方法简单、快速、准确、便于现场监测控制. 相似文献
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本文证明了层叠滤的两个重要性质,即自包含性与压缩性。继而研究了更广一类的窗滤波,并证明了具有自包含性的窗滤波就是层叠滤波。 相似文献
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The polarization behavior of microbial fuel cells(MFCs)was evaluated under different stack operation modes,including series,parallel,series–parallel,and parallel–series.During the stack operation,voltages of individual MFCs,subunit stacks,and overall stacks were recorded as a function of the current.Meanwhile,the potentials of individual MFCs’anode and cathode were also determined via Ag/AgCl electrodes to study the change in potentials under stack operations.The results demonstrated that the MFCs with relatively low ability to generate current were easier to suffer polarity reversal in the series stack,which was confirmed in the series subunit of the series–parallel stack.MFCs with high electroactivity would be enhanced to generate larger maximum power;however,MFCs with low electroactivity outputted smaller maximum power in a parallel stack.The changes in individual MFCs’behavior under stack operation mode were determined primarily caused by the influences on the behavior of the anode.Results of the present study provide valuable information for optimization of stack operation of MFCs. 相似文献
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为了研制出便携式的具有较高性能的高能闪光X射线系统,需要发展新型紧凑型的高能闪光X射线二极管,要求其体积小,能工作在较高电压下。简要介绍了冷阴极X射线二极管的结构和工作原理;阐述了二极管绝缘结构设计原则,设计了一种新型的紧凑型轴向绝缘结构的X射线二极管;在高压端和地电极之间采用绝缘环和金属均压环交替叠加进行轴向绝缘,有利于减小二次电子发射几率,降低绝缘体表面爬电几率,缩短轴向绝缘距离。二极管工作电压为1 MV,轴向绝缘距离约260 mm,结合ANSYS数值模拟软件进行了静电场数值计算。二极管轴向绝缘区最大工作场强为95 kV/cm,各阳极三相点最大场强为26 kV/cm。计算结果表明:二极管的工作场强低于真空闪络场强;所有三相点的工作场强均满足绝缘要求。 相似文献
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200W MCFC电池组的电化学性能及热平衡计算 总被引:1,自引:0,他引:1
MCFC电池组 (6对电池 ,电极面积 2 2 6cm2 )在 0 .9MPa/cm2 反应气压下 ,输出功率为2 17.6W .热平衡计算表明 ,该电池组在 30 0mA/cm2 电流密度下放电 ,当气体利用率为 2 0 %时 ,电池组处于热平衡状态下运行 .若维持此热平衡 (电池组内最高温度为 70 0℃ ,运行温度 6 5 0℃ )状态且提高反应气体利用率 ,则电池组热平衡点的电流密度将下降 ,以空气 +CO2 为氧化剂 ,H2 +CO2 为燃料气时 ,在不同气体利用率下电池组热平衡点的电流密度均大于 10 0mA/cm2 .提高电池组的输出功率 ,热电效率将下降 ;提高反应气压 ,热电效率相应提高 相似文献
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《Analytical letters》2012,45(4):299-312
Abstract The coupling of continuous gaseous source monitors to stacks or ducts usually requires some degree of sample conditioning. A novel device has been designed and constructed to eliminate the problems of moisture condensation and particulate entrainment in sampling systems by diluting the stack gas in-situ and measuring the resulting sample stream with ambient air sensors. Dilution ratios of from 500:1 through 2400:1 have been studied and the feasibility of a prototype design has been demonstrated in the field. 相似文献