摘要：Utilizing single atom sites doping into metal oxides to modulate their intrinsic active sites,achieving precise selectivity control in complex organic reactions,is a highly desirable yet challenging ***,identifying the active site also represents a significant obstacle,primarily due to the intricate electronic environment of single atom site doped metal ***,a single atom Cu doped TiO_(2)catalyst(Cu_(1)-TiO_(2))is prepared via a simple“colloid-acid treatment”strategy,which switches aniline oxidation selectivity of TiO_(2)from azoxybenzene to nitrosobenzene,without using additives or changing solvent,while other metal or nonmetal doped TiO_(2)did not *** mechanistic investigations and DFT calculations unveil that Ti-O active site is responsible for triggering the aniline to form a new PhNOH intermediate,two PhNOH condense to azoxybenzene over TiO_(2)*** for Cu_(1)-TiO_(2),the charge-specific distribution between the isolated Cu and TiO_(2)generates unique Cu_(1)-O-Ti hybridization structure with nine catalytic active sites,eight of them make PhNOH take place spontaneous dissociation to produce *** work not only unveils a new mechanistic pathway featuring the PhNOH intermediate in aniline oxidation for the first time but also presents a novel approach for constructing single-atom doped metal oxides and exploring their intricate active sites.

摘要：传统方法中采用直接调制半导光纤体产生的脉冲信号进行通信信号加强,半导光纤体产生脉冲开关接近于高斯分布,带有一定量的干扰,影响通信信号质量。为此,提出半导光纤体脉冲功率自动控制系统的设计方法,通过利用半导光纤体进行通信的虚拟线路构建优化编码,实现虚拟线路代替终端硬件,使通信数据在通信中完整传输,半导光纤体脉冲功率自动控制系统控制的通信网络能够去除信号干扰。在仿真实验中检测了通信的数据传输时间、数据传输稳定性和数据传输过程中的抗干扰等性能。结果表明,半导光纤体脉冲功率自动控制系统通信数据传输完整,稳定性和抗干扰性都优于传统方法,能够解决传统方法的弊端。