To investigate how the physicochemical properties and NH3‐selective catalytic reduction(NH3‐SCR)performance of supported ceria‐based catalysts are influenced as a function of support type,a series of CeO2/SiO2,CeO2...To investigate how the physicochemical properties and NH3‐selective catalytic reduction(NH3‐SCR)performance of supported ceria‐based catalysts are influenced as a function of support type,a series of CeO2/SiO2,CeO2/γ‐Al2O3,CeO2/ZrO2,and CeO2/TiO2catalysts were prepared.The physicochemical properties were probed by means of X‐ray diffraction,Raman spectroscopy,Brunauer‐Emmett‐Teller surface area measurements,X‐ray photoelectron spectroscopy,H2‐temperature programmed reduction,and NH3‐temperature programmed desorption.Furthermore,the supported ceria‐based catalysts'catalytic performance and H2O+SO2tolerance were evaluated by the NH3‐SCR model reaction.The results indicate that out of the supported ceria‐based catalysts studied,the CeO2/γ‐Al2O3catalyst exhibits the highest catalytic activity as a result of having a high relative Ce3+/Ce4+ratio,optimum reduction behavior,and the largest total acid site concentration.Finally,the CeO2/γ‐Al2O3catalyst also presents excellent H2O+SO2tolerance during the NH3‐SCR process.展开更多
We propose and analyze a submicron stub-assisted ultrafast all-optical plasmonic switch based on nonlinear MIM waveguide. It is constructed by two silicon stub filters sandwiched by silver cladding. The signal wavelen...We propose and analyze a submicron stub-assisted ultrafast all-optical plasmonic switch based on nonlinear MIM waveguide. It is constructed by two silicon stub filters sandwiched by silver cladding. The signal wavelength is assumed to be 1550 nm. The simulation results show a ?14.66 dB extinction ratio. Downscaling the silicon waveguide in MIM structure leads to enhancement of the effective Kerr nonlinearity due to tight mode confinement. Also, using O+ ions implanted into silicon, the switching time less than 10 ps and a delay time less than 8 fs are achieved. The overall length of the switch is 550 nm.展开更多
目的 探讨预防性加温输液在急诊严重创伤患者中的应用效果。方法 选取2022年1月至12月上海市第六人民医院收治的急诊严重创伤患者84例,采用随机数字表法分为对照组(42例)和观察组(42例)。对照组采用常规干预和常规保温措施,观察组在对...目的 探讨预防性加温输液在急诊严重创伤患者中的应用效果。方法 选取2022年1月至12月上海市第六人民医院收治的急诊严重创伤患者84例,采用随机数字表法分为对照组(42例)和观察组(42例)。对照组采用常规干预和常规保温措施,观察组在对照组的基础上进行预防性加温输液。比较两组体温值、凝血指标和酸碱指标变化,28 d存活率,寒战、低体温发生率。结果 两组体温组间、时间点及交互作用比较,差异有统计学意义(P<0.05)。进一步两两比较,组内比较:两组组内各时间点体温值比较,差异无统计学意义(P>0.05);组间比较:观察组入院后4、8、12、24 h体温值高于对照组,差异有统计学意义(P<0.05)。两组TT水平组间、时间点及交互作用比较,差异有统计学意义(P<0.05)。其中,两组入院后24 h TT水平高于入院时,观察组入院6、12、24 h TT水平低于对照组,差异有统计学意义(P<0.05)。两组不同时间FIB水平比较,差异有统计学意义(P<0.05)。其中两组入院后24 h FIB水平低于入院时,差异有统计学意义(P<0.05)。两组不同时间点血乳酸水平比较,差异有统计学意义(P<0.05)。其中两组入院后6、12、24 h血乳酸水平高于入院时,差异有统计学意义(P<0.05)。两组p H值水平组间、时间点比较,差异有统计学意义(P<0.05)。其中两组入院后6、12、24 h p H值水平低于入院时,差异有统计学意义(P<0.05)。观察组寒战、低体温发生率低于对照组,差异有统计学意义(P<0.05)。两组28 d存活率比较,差异无统计学意义(P>0.05)。结论 预防性加温输液可减少寒战和低体温的发生,并改善患者凝血功能。展开更多
基金supported by the National Natural Science Foundation of China (21507130)the Chongqing Science and Technology Commission (cstc2016jcyjA 0070,cstc2014pt-gc20002,cstc2014yykfC 20003,cstckjcxljrc13)the Open Project Program of Chongqing Key Laboratory of Ca-talysis and Functional Organic Molecules from Chongqing Technology and Business University (1456029)~~
文摘To investigate how the physicochemical properties and NH3‐selective catalytic reduction(NH3‐SCR)performance of supported ceria‐based catalysts are influenced as a function of support type,a series of CeO2/SiO2,CeO2/γ‐Al2O3,CeO2/ZrO2,and CeO2/TiO2catalysts were prepared.The physicochemical properties were probed by means of X‐ray diffraction,Raman spectroscopy,Brunauer‐Emmett‐Teller surface area measurements,X‐ray photoelectron spectroscopy,H2‐temperature programmed reduction,and NH3‐temperature programmed desorption.Furthermore,the supported ceria‐based catalysts'catalytic performance and H2O+SO2tolerance were evaluated by the NH3‐SCR model reaction.The results indicate that out of the supported ceria‐based catalysts studied,the CeO2/γ‐Al2O3catalyst exhibits the highest catalytic activity as a result of having a high relative Ce3+/Ce4+ratio,optimum reduction behavior,and the largest total acid site concentration.Finally,the CeO2/γ‐Al2O3catalyst also presents excellent H2O+SO2tolerance during the NH3‐SCR process.
文摘We propose and analyze a submicron stub-assisted ultrafast all-optical plasmonic switch based on nonlinear MIM waveguide. It is constructed by two silicon stub filters sandwiched by silver cladding. The signal wavelength is assumed to be 1550 nm. The simulation results show a ?14.66 dB extinction ratio. Downscaling the silicon waveguide in MIM structure leads to enhancement of the effective Kerr nonlinearity due to tight mode confinement. Also, using O+ ions implanted into silicon, the switching time less than 10 ps and a delay time less than 8 fs are achieved. The overall length of the switch is 550 nm.
文摘目的 探讨预防性加温输液在急诊严重创伤患者中的应用效果。方法 选取2022年1月至12月上海市第六人民医院收治的急诊严重创伤患者84例,采用随机数字表法分为对照组(42例)和观察组(42例)。对照组采用常规干预和常规保温措施,观察组在对照组的基础上进行预防性加温输液。比较两组体温值、凝血指标和酸碱指标变化,28 d存活率,寒战、低体温发生率。结果 两组体温组间、时间点及交互作用比较,差异有统计学意义(P<0.05)。进一步两两比较,组内比较:两组组内各时间点体温值比较,差异无统计学意义(P>0.05);组间比较:观察组入院后4、8、12、24 h体温值高于对照组,差异有统计学意义(P<0.05)。两组TT水平组间、时间点及交互作用比较,差异有统计学意义(P<0.05)。其中,两组入院后24 h TT水平高于入院时,观察组入院6、12、24 h TT水平低于对照组,差异有统计学意义(P<0.05)。两组不同时间FIB水平比较,差异有统计学意义(P<0.05)。其中两组入院后24 h FIB水平低于入院时,差异有统计学意义(P<0.05)。两组不同时间点血乳酸水平比较,差异有统计学意义(P<0.05)。其中两组入院后6、12、24 h血乳酸水平高于入院时,差异有统计学意义(P<0.05)。两组p H值水平组间、时间点比较,差异有统计学意义(P<0.05)。其中两组入院后6、12、24 h p H值水平低于入院时,差异有统计学意义(P<0.05)。观察组寒战、低体温发生率低于对照组,差异有统计学意义(P<0.05)。两组28 d存活率比较,差异无统计学意义(P>0.05)。结论 预防性加温输液可减少寒战和低体温的发生,并改善患者凝血功能。
