通过强度调制光电流谱(IMPS)和强度调制光电压谱(IMVS)技术研究在光电分解水制氢体系中碳点光阳极与KOH电解液界面的动力学行为。结果表明,光强在30–90 m W·cm^(-2)范围内,界面的电子传输时间(τ_d)、电子寿命(τ_n)、电子扩散系...通过强度调制光电流谱(IMPS)和强度调制光电压谱(IMVS)技术研究在光电分解水制氢体系中碳点光阳极与KOH电解液界面的动力学行为。结果表明,光强在30–90 m W·cm^(-2)范围内,界面的电子传输时间(τ_d)、电子寿命(τ_n)、电子扩散系数(D_n)、电子扩散长度(L_n)均没有变化;当光强增加到110和130 m W·cm^(-2)时,τ_d和τ_n延长,而D_n减小。实验表明,不同于Ti O_2/电解液等界面,碳点光电极/电解液界面中碳点电极存在的缺陷少,因此电子主要以无陷阱限制扩散方式传输为主。且在30–130 m W·cm^(-2)的光强范围内,与τ_d和τ_n相关的载流子收集效率(η_(cc))相近。展开更多
2003年，美国全年完成的PET检查数量估计超过了70万次，这是一家名为IMV Medical Information Division公司最新的市场调查报告中披露的数字。共有1500家医院和PET或PET／CT流动检查站，包括带符合检测的核医学照相设备(NM-CD)在2003年...2003年，美国全年完成的PET检查数量估计超过了70万次，这是一家名为IMV Medical Information Division公司最新的市场调查报告中披露的数字。共有1500家医院和PET或PET／CT流动检查站，包括带符合检测的核医学照相设备(NM-CD)在2003年里的检查数量。其中，针对肿瘤进行的PET检查占总数的93％，展开更多
The mpox(formerly known as monkeypox)outbreak was declared a Public Health Emergency of International Concern(PHEIC)by the World Health Organization(WHO)on two separate occasions,with the PHEIC status remaining in eff...The mpox(formerly known as monkeypox)outbreak was declared a Public Health Emergency of International Concern(PHEIC)by the World Health Organization(WHO)on two separate occasions,with the PHEIC status remaining in effect following the second declaration on August 14,2024[1,2].The causative agent,mpox virus(MPXV),is a double-stranded DNA virus belonging to the genus Orthopoxvirus within the family Poxviridae[3].MPXV produce two antigenically distinct infectious virion forms:intracellular mature virions(IMVs)and extracellular enveloped virions(EEVs).Currently,the prevention and control of mpox have several challenges,including sustained human-to-human transmission,the increasing frequency and geographic spread of outbreaks,and ongoing viral adaptive evolution[4].These challenges are likely driven by the discontinuation of smallpox vaccination and the waning immunity in current population cohorts.展开更多
文摘通过强度调制光电流谱(IMPS)和强度调制光电压谱(IMVS)技术研究在光电分解水制氢体系中碳点光阳极与KOH电解液界面的动力学行为。结果表明,光强在30–90 m W·cm^(-2)范围内,界面的电子传输时间(τ_d)、电子寿命(τ_n)、电子扩散系数(D_n)、电子扩散长度(L_n)均没有变化;当光强增加到110和130 m W·cm^(-2)时,τ_d和τ_n延长,而D_n减小。实验表明,不同于Ti O_2/电解液等界面,碳点光电极/电解液界面中碳点电极存在的缺陷少,因此电子主要以无陷阱限制扩散方式传输为主。且在30–130 m W·cm^(-2)的光强范围内,与τ_d和τ_n相关的载流子收集效率(η_(cc))相近。
文摘2003年，美国全年完成的PET检查数量估计超过了70万次，这是一家名为IMV Medical Information Division公司最新的市场调查报告中披露的数字。共有1500家医院和PET或PET／CT流动检查站，包括带符合检测的核医学照相设备(NM-CD)在2003年里的检查数量。其中，针对肿瘤进行的PET检查占总数的93％，
基金supported by the National Key Research and Development Program of China(grant number 2025YFC2311800 to H.W.)the National Natural Science Foundation of China(grant number 32270157 to H.W.)the Beijing Nova Program(to H.W.).
文摘The mpox(formerly known as monkeypox)outbreak was declared a Public Health Emergency of International Concern(PHEIC)by the World Health Organization(WHO)on two separate occasions,with the PHEIC status remaining in effect following the second declaration on August 14,2024[1,2].The causative agent,mpox virus(MPXV),is a double-stranded DNA virus belonging to the genus Orthopoxvirus within the family Poxviridae[3].MPXV produce two antigenically distinct infectious virion forms:intracellular mature virions(IMVs)and extracellular enveloped virions(EEVs).Currently,the prevention and control of mpox have several challenges,including sustained human-to-human transmission,the increasing frequency and geographic spread of outbreaks,and ongoing viral adaptive evolution[4].These challenges are likely driven by the discontinuation of smallpox vaccination and the waning immunity in current population cohorts.
