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The concentrations of CO2 were measured by the supercontinuum laser at normal temperature and variable temperature accurately in this paper. The absorption spectra of CO2 at different concentrations(1.2%—9.0%) were measured in the wavelength range of 1 425—1 445 nm under the optical path of 26.4 m at 293 K and 1 atm. The experimental results showed that the positions of the primary and secondary absorption peaks(1 432 nm, 1 437 nm) were consistent with the HITRAN database. A linear model of concentration and signal intensity at 1 432 nm was established. The maximum relative error of the concentration measurement was 3.3%. The line intensities of 99.9% CO2 in the 1 425—1 445 nm at different temperatures(298—373 K, interval of 15 K) were measured. The influence of temperature changes on the concentration measurement result was corrected and the relative error of the concentration measurement was reduced to 1.4%. Finally, the source of the uncertainty of the entire spectrum measurement system was analyzed and evaluated. This paper demonstrate that the supercontinuum laser can achieve the long-distance measurement of the CO2 under normal temperature or variable temperature environment accurately, which provide an important reference for the long-distance gas detection on site and simultaneous detection of multi-component gases. 相似文献
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为改善过滤材料的使用性能,满足焦化厂除尘工况的使用要求,选用聚四氟乙烯乳液对玄武岩针刺滤料(X)、氟美斯针刺滤料(F)、玄武岩与氟美斯复合针刺滤料(XF)进行表面改性,并根据相关标准对滤料改性前后的热学性能、耐氧化性能、抗静电性能进行了测试。结果表明:3种滤料表面改性前后均为放热反应,表面改性前后热分解外推起始温度均在350℃左右,焦炉烟气平均温度在230℃,均高于使用温度,符合使用要求;经氧化剂处理,3种滤料表面改性后断裂强力损失率均值较小,说明抗氧化性能改善;表面改性前X滤料的感应静电等级为A级、F滤料的感应静电等级为A级、XF滤料的感应静电等级为C级,表面改性后X滤料、F滤料、XF滤料的感应静电等级均为B级。 相似文献
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目的 探讨生理性起搏器在缓慢型心律失常中的临床疗效与安全性.方法 共85例患者,起搏器包括双腔起搏器DDD[心房+心室(起搏心腔);心房+心室(感知心腔);双重(1抑制十T触发)(感知后反应方式)]60例,双腔起搏器VDD[心室(起搏心腔);心房+心室(感知心腔);双重(1抑制十T触发)(感知后反应方式)]3例,双腔起搏器WIR[心房+心室(起搏心腔);心房+心室(感知心腔)十(1抑制)(感知后反应方式);R频率调整(程控功能)]22例.结果 85例患者均手术成功,术中测得心室起搏阈值为(0.42±0.13)v/0.5 ms,阻抗(560+130)Ω,R波振幅(9.8±2.2)mV;右心房起搏阈值为(0.89±0.27)V/0.5 ms,阻抗(670±180)Ω,P波振幅(2.8±1.2)mV,P波感知灵敏度(0.48±0.3)mV.A-V间期程控在140～160 ms,频率适应参数程控为反应时间和恢复时间取中档值,增益取低档值,下限频率程控为60～70次/min,上限频率程控于110～130次/min,感知阈值取中档,频率适应档次取4～5.随访4～50个月,所有患者的生活质量明显提高,无起搏器并发症发生.结论 生理性起搏可产生较好的血液动力学效应,改善心功能,提高运动耐量,对有适应证的起搏器患者应首先推荐使用各类生理性起搏器. 相似文献
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随着科学技术的不断发展,许多新型先进的技术随之诞生,非真实感绘制是计算机图形学当中一个研究的重点问题,其是一项计算机技术和绘画艺术相结合的技术,其主要的是能够通过计算机来生成不具有照片真实感而具有手绘图形的技术。以下就主要的对于面向对象非真实感风格化图像处理技术进行探讨分析,提升其在使用中的效果。 相似文献
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