本文以Suwannee River NOM(SRNOM)和Upper Mississippi River NOM(UMRNOM)两种溶解性有机物(DOM)为研究对象,利用500 W高压氙灯作为光源模拟太阳光,进行室内光解实验,考察了DOM的浓度对水相中荧蒽光降解的影响.研究结果表明,光降解是荧...本文以Suwannee River NOM(SRNOM)和Upper Mississippi River NOM(UMRNOM)两种溶解性有机物(DOM)为研究对象,利用500 W高压氙灯作为光源模拟太阳光,进行室内光解实验,考察了DOM的浓度对水相中荧蒽光降解的影响.研究结果表明,光降解是荧蒽的主要降解途径,荧蒽的光降解符合一级动力学方程.这两种DOM均促进了荧蒽的光降解,并且这两种DOM对荧蒽光降解的促进作用均随着溶解有机碳(DOC)浓度的升高而降低.在DOM存在的条件下,荧蒽的表观光降解速率常数(K)值与两种DOM的DOC(a_(280)和a_(350))均具有显著负相关性,而与E_(2)/E_(3)和荧光强度无显著性相关性.展开更多
A fault processing policy was proposed for the circumstance under which all the dual-redundant closed-loop feedback control sensors went wrong.This policy was based on dual-redundant control law and may maintain the p...A fault processing policy was proposed for the circumstance under which all the dual-redundant closed-loop feedback control sensors went wrong.This policy was based on dual-redundant control law and may maintain the performance of turbofan engines.When pair of controlling sensors went wrong and the primary control law was unable to implement,control system performs the backup control law instead of the primary one so that the fault sensors were isolated from the closed control loop.This fault processing policy may not only avoid increasing engine weight and cost with the additional sensors hardware,but also avoid the error of analytical sensor signal.It can improve the engine mission reliability and control quality.展开更多
文摘本文以Suwannee River NOM(SRNOM)和Upper Mississippi River NOM(UMRNOM)两种溶解性有机物(DOM)为研究对象,利用500 W高压氙灯作为光源模拟太阳光,进行室内光解实验,考察了DOM的浓度对水相中荧蒽光降解的影响.研究结果表明,光降解是荧蒽的主要降解途径,荧蒽的光降解符合一级动力学方程.这两种DOM均促进了荧蒽的光降解,并且这两种DOM对荧蒽光降解的促进作用均随着溶解有机碳(DOC)浓度的升高而降低.在DOM存在的条件下,荧蒽的表观光降解速率常数(K)值与两种DOM的DOC(a_(280)和a_(350))均具有显著负相关性,而与E_(2)/E_(3)和荧光强度无显著性相关性.
文摘A fault processing policy was proposed for the circumstance under which all the dual-redundant closed-loop feedback control sensors went wrong.This policy was based on dual-redundant control law and may maintain the performance of turbofan engines.When pair of controlling sensors went wrong and the primary control law was unable to implement,control system performs the backup control law instead of the primary one so that the fault sensors were isolated from the closed control loop.This fault processing policy may not only avoid increasing engine weight and cost with the additional sensors hardware,but also avoid the error of analytical sensor signal.It can improve the engine mission reliability and control quality.
