本文指出现代高层建筑、超高层建筑兴起发展背景下,建筑内部普遍覆盖有多类电气产品,不同产品应用方向和参数存在差异,应急照明电源(Emergency Power Supply,EPS)能够有效提升建筑供配电设计中照明系统的智能性、稳定性。本文分析了建...本文指出现代高层建筑、超高层建筑兴起发展背景下,建筑内部普遍覆盖有多类电气产品,不同产品应用方向和参数存在差异,应急照明电源(Emergency Power Supply,EPS)能够有效提升建筑供配电设计中照明系统的智能性、稳定性。本文分析了建筑工程供配电设计中应急照明电源EPS的运用现状、优势特征,系统性总结阐述了建筑工程供配电系统设计中应急照明电源EPS的运用方法、容量计算方法,通过实际案例为EPS配置计算作了引用论述,并就EPS常见维护问题进行了综合论述,旨在进一步完善建筑工程供配电设计中EPS运用研究理论依据,为相关工作提供参考。展开更多
Although many studies have found that cadmium(Cd)can be toxic to microalgae,only a few reports focused on the role of extracellular polymeric substances(EPS)in Cd(Ⅱ)detoxification.The biochemical and physiological en...Although many studies have found that cadmium(Cd)can be toxic to microalgae,only a few reports focused on the role of extracellular polymeric substances(EPS)in Cd(Ⅱ)detoxification.The biochemical and physiological endpoints of Microcystis aeruginosa,including the composition and functional groups of soluble EPS(SL-EPS),loosely bound EPS(LB-EPS),and tightly bound EPS(TB-EPS),were detected to elucidate the toxicity and detoxification mechanisms of Cd(Ⅱ)for cyanobacteria.Toxicological and physiological assays on M.aeruginosa showed that the 0.25-mg/L Cd(Ⅱ)resulted in a larger inhibition on growth and F_(v)/F_(m).Nevertheless,Cd(Ⅱ)significantly induced much higher contents of superoxide dismutase(SOD),intracellular microcystin LR(MC-LR),extracellular MC-LR,and EPS.Scanning electron microscopy with energy dispersive X-ray spectroscopy confirmed that Cd(Ⅱ)was absorbed into the EPS layer.Fourier transform infrared spectrum analysis revealed that the functional groups bound with Cd(Ⅱ)of algae biomass,SL-EPS,LB-EPS,and TB-EPS were somewhat different.The C=O/C=N groups ofδ-lactam or protein were their prominent functional groups,suggesting that amide or proteins in the EPS played a key role in the adsorption in Cd(Ⅱ).The concentration of 0.25 mg/L of Cd(Ⅱ)may change the chemical structure of EPS by altering the production of protein-like substances containing tryptophan.This study indicated that M.aeruginosa could detoxify Cd(Ⅱ)stress via induction of antioxidant capacity(higher SOD activity and MC synthesis),EPS production,and modification in chemical structure of EPS.展开更多
文摘本文指出现代高层建筑、超高层建筑兴起发展背景下,建筑内部普遍覆盖有多类电气产品,不同产品应用方向和参数存在差异,应急照明电源(Emergency Power Supply,EPS)能够有效提升建筑供配电设计中照明系统的智能性、稳定性。本文分析了建筑工程供配电设计中应急照明电源EPS的运用现状、优势特征,系统性总结阐述了建筑工程供配电系统设计中应急照明电源EPS的运用方法、容量计算方法,通过实际案例为EPS配置计算作了引用论述,并就EPS常见维护问题进行了综合论述,旨在进一步完善建筑工程供配电设计中EPS运用研究理论依据,为相关工作提供参考。
基金Supported by the National Natural Science Foundation of China(Nos.31800457,32170383)。
文摘Although many studies have found that cadmium(Cd)can be toxic to microalgae,only a few reports focused on the role of extracellular polymeric substances(EPS)in Cd(Ⅱ)detoxification.The biochemical and physiological endpoints of Microcystis aeruginosa,including the composition and functional groups of soluble EPS(SL-EPS),loosely bound EPS(LB-EPS),and tightly bound EPS(TB-EPS),were detected to elucidate the toxicity and detoxification mechanisms of Cd(Ⅱ)for cyanobacteria.Toxicological and physiological assays on M.aeruginosa showed that the 0.25-mg/L Cd(Ⅱ)resulted in a larger inhibition on growth and F_(v)/F_(m).Nevertheless,Cd(Ⅱ)significantly induced much higher contents of superoxide dismutase(SOD),intracellular microcystin LR(MC-LR),extracellular MC-LR,and EPS.Scanning electron microscopy with energy dispersive X-ray spectroscopy confirmed that Cd(Ⅱ)was absorbed into the EPS layer.Fourier transform infrared spectrum analysis revealed that the functional groups bound with Cd(Ⅱ)of algae biomass,SL-EPS,LB-EPS,and TB-EPS were somewhat different.The C=O/C=N groups ofδ-lactam or protein were their prominent functional groups,suggesting that amide or proteins in the EPS played a key role in the adsorption in Cd(Ⅱ).The concentration of 0.25 mg/L of Cd(Ⅱ)may change the chemical structure of EPS by altering the production of protein-like substances containing tryptophan.This study indicated that M.aeruginosa could detoxify Cd(Ⅱ)stress via induction of antioxidant capacity(higher SOD activity and MC synthesis),EPS production,and modification in chemical structure of EPS.