“一氧化碳”的电化学式气体传感器的应用和探讨

有毒及易燃易爆气体报警器的周期性检定作为石油、化工等生产性企业安全防护的重要方面,报警器核心部件传感器的线性度、可靠性、检测结果的准确性就显得尤为重要。以一氧化碳有毒电化学式气体传感器为例,对传感器的工作原理及整体工作过程进行了详细分析;对每部分结构的作用进行了简要描述;性能参数指标分情况进行探论。最终对一氧化碳有毒电化学式传感器的线性度、相关性、响应时间、温湿度依赖性进行了有效评估。

Relative humidity and temperature dependence of mechanical degradation of natural fiber composites^(?)

In this paper,the mechanical degradation of natural fiber composites is studied with the consideration of the relative humidity and the temperature.A nonlinear constitutive model is established,which employs an internal variable to describe the mechanical degradation related to the energy dissipation during moisture absorption.The existing experimental researches demonstrated that the mechanical degradation is an irreversible thermodynamic process induced by the degradation of fibers and the damages of interfaces between fiber and matrix,both of which depend on the variation of the relative humidity or the temperature.The evolution of the mechanical degradation is obtained through the determination of dissipation rates as a function of the relative humidity and the temperature.The theoretically predicted mechanical degradations are compared with experimental results of sisal fiber reinforced composites subject to different relative humidity and temperatures,and a good agreement is found.