Dynamic plasmonics with the real-time active control capability of plasmonic resonances attracts much interest in the communities of physics,chemistry,and material science.Among versatile reconfigurable strategies for...Dynamic plasmonics with the real-time active control capability of plasmonic resonances attracts much interest in the communities of physics,chemistry,and material science.Among versatile reconfigurable strategies for dynamic plasmonics,electrochemically driven strategies have garnered most of the attention.We summarize three primary strategies to enable electrochemically dynamic plasmonics,including structural transformation,carrier-density modulation,and electrochemically active surrounding-media manipulation.The reconfigurable microstructures,optical properties,and underlying physical mechanisms are discussed in detail.We also summarize the most promising applications of dynamic plasmonics,including smart windows,structural color displays,and chemical sensors.We suggest more research efforts toward the widespread applications of dynamic plasmonics.展开更多
In this paper,to better reveal the surface effect and the screening effect as well as the nonlinear multi-field coupling characteristic of the multifunctional piezoelectric semiconductor(PS)nanodevice,and to further i...In this paper,to better reveal the surface effect and the screening effect as well as the nonlinear multi-field coupling characteristic of the multifunctional piezoelectric semiconductor(PS)nanodevice,and to further improve its working performance,a magneto-mechanical-thermo coupling theoretical model is theoretically established for the extensional analysis of a three-layered magneto-electro-semiconductor coupling laminated nanoplate with the surface effect.Next,by using the current theoretical model,some numerical analyses and discussion about the surface effect,the corresponding critical thickness of the nanoplate,and the distributions of the physical fields(including the electron concentration perturbation,the electric potential,the electric field,the average electric displacement,the effective polarization charge density,and the total charge density)under different initial state electron concentrations,as well as their active manipulation via some external magnetic field,pre-stress,and temperature stimuli,are performed.Utilizing the nonlinear multi-field coupling effect induced by inevitable external stimuli in the device operating environment,this paper not only provides theoretical support for understanding the size-dependent tuning/controlling of carrier transport as well as its screening effect,but also assists the design of a series of multiferroic PS nanodevices.展开更多
针对无源电磁调控中目标模拟逼真度不高的问题,基于有源频率选择表面(Active Frequency Selective Surface,AFSS)的周期性间歇调制,提出了一种AFSS协同调控的雷达目标模拟方法。根据雷达信号参数和AFSS周期性间歇调制信号参数确定目标...针对无源电磁调控中目标模拟逼真度不高的问题,基于有源频率选择表面(Active Frequency Selective Surface,AFSS)的周期性间歇调制,提出了一种AFSS协同调控的雷达目标模拟方法。根据雷达信号参数和AFSS周期性间歇调制信号参数确定目标的距离分布,再使AFSS调制信号的相位满足协同调控条件,即可在距离向上生成逼真度较高的模拟目标。文中给出了AFSS周期性间歇调制的基本原理,并理论推导了AFSS协同调控的实现条件。最后进行了仿真验证,仿真结果验证了该方法的可行性和有效性。展开更多
There are three ways to manage earnings, namely, accruals earnings management, real activities manipulation, and shifting of core expense. The famous methods to manage earnings are accruals earnings management and rea...There are three ways to manage earnings, namely, accruals earnings management, real activities manipulation, and shifting of core expense. The famous methods to manage earnings are accruals earnings management and real activities manipulation. Usually, real activities manipulation is conducted on the going period. The action will increase the loss for the firms at the end of the period. To avoid the loss, managers will manage earnings through accruals （discretionary accruals）. Therefore, the objective of this study is to investigate whether real activities manipulation positively influences accruals earnings management. To investigate the issue, this study collected data from Indonesia Stock Exchange （IDX）. Samples of this study are the manufacturing companies. There are 196 firms from the year 2003 to 2007. The results of this study support the research hypothesis that real activities manipulation positively influences accruals earnings management. The higher the real activities manipulation effects, the higher the accruals earnings management at the end of the period.There are three ways to manage earnings, namely, accruals earnings management, real activities manipulation, and shifting of core expense. The famous methods to manage earnings are accruals earnings management and real activities manipulation. Usually, real activities manipulation is conducted on the going period. The action will increase the loss for the firms at the end of the period. To avoid the loss, managers will manage earnings through accruals （discretionary accruals）. Therefore, the objective of this study is to investigate whether real activities manipulation positively influences accruals earnings management. To investigate the issue, this study collected data from Indonesia Stock Exchange （IDX）. Samples of this study are the manufacturing companies. There are 196 firms from the year 2003 to 2007. The results of this study support the research hypothesis that real activities manipulation positively influences accruals ear展开更多
基金jointly supported by the National Natural Science Foundation of China(Nos.12022403,61735008,51925204,and 11874211)Key Science and Technology Innovation Program of Shandong Province(No.2019JZZY020704)the Fundamental Research Funds for the Central Universities(Nos.021314380140 and 021314380150)。
文摘Dynamic plasmonics with the real-time active control capability of plasmonic resonances attracts much interest in the communities of physics,chemistry,and material science.Among versatile reconfigurable strategies for dynamic plasmonics,electrochemically driven strategies have garnered most of the attention.We summarize three primary strategies to enable electrochemically dynamic plasmonics,including structural transformation,carrier-density modulation,and electrochemically active surrounding-media manipulation.The reconfigurable microstructures,optical properties,and underlying physical mechanisms are discussed in detail.We also summarize the most promising applications of dynamic plasmonics,including smart windows,structural color displays,and chemical sensors.We suggest more research efforts toward the widespread applications of dynamic plasmonics.
基金supported by the National Natural Science Foundation of China(Nos.12072253,11972176,and 12062011)the Doctoral Science Fund of Lanzhou University of Technology of China(No.062002)the Opening Project from the State Key Laboratory for Strength and Vibration of Mechanical Structures of China(No.SV2021-KF-19)。
文摘In this paper,to better reveal the surface effect and the screening effect as well as the nonlinear multi-field coupling characteristic of the multifunctional piezoelectric semiconductor(PS)nanodevice,and to further improve its working performance,a magneto-mechanical-thermo coupling theoretical model is theoretically established for the extensional analysis of a three-layered magneto-electro-semiconductor coupling laminated nanoplate with the surface effect.Next,by using the current theoretical model,some numerical analyses and discussion about the surface effect,the corresponding critical thickness of the nanoplate,and the distributions of the physical fields(including the electron concentration perturbation,the electric potential,the electric field,the average electric displacement,the effective polarization charge density,and the total charge density)under different initial state electron concentrations,as well as their active manipulation via some external magnetic field,pre-stress,and temperature stimuli,are performed.Utilizing the nonlinear multi-field coupling effect induced by inevitable external stimuli in the device operating environment,this paper not only provides theoretical support for understanding the size-dependent tuning/controlling of carrier transport as well as its screening effect,but also assists the design of a series of multiferroic PS nanodevices.
文摘针对无源电磁调控中目标模拟逼真度不高的问题,基于有源频率选择表面(Active Frequency Selective Surface,AFSS)的周期性间歇调制,提出了一种AFSS协同调控的雷达目标模拟方法。根据雷达信号参数和AFSS周期性间歇调制信号参数确定目标的距离分布,再使AFSS调制信号的相位满足协同调控条件,即可在距离向上生成逼真度较高的模拟目标。文中给出了AFSS周期性间歇调制的基本原理,并理论推导了AFSS协同调控的实现条件。最后进行了仿真验证,仿真结果验证了该方法的可行性和有效性。
文摘There are three ways to manage earnings, namely, accruals earnings management, real activities manipulation, and shifting of core expense. The famous methods to manage earnings are accruals earnings management and real activities manipulation. Usually, real activities manipulation is conducted on the going period. The action will increase the loss for the firms at the end of the period. To avoid the loss, managers will manage earnings through accruals （discretionary accruals）. Therefore, the objective of this study is to investigate whether real activities manipulation positively influences accruals earnings management. To investigate the issue, this study collected data from Indonesia Stock Exchange （IDX）. Samples of this study are the manufacturing companies. There are 196 firms from the year 2003 to 2007. The results of this study support the research hypothesis that real activities manipulation positively influences accruals earnings management. The higher the real activities manipulation effects, the higher the accruals earnings management at the end of the period.There are three ways to manage earnings, namely, accruals earnings management, real activities manipulation, and shifting of core expense. The famous methods to manage earnings are accruals earnings management and real activities manipulation. Usually, real activities manipulation is conducted on the going period. The action will increase the loss for the firms at the end of the period. To avoid the loss, managers will manage earnings through accruals （discretionary accruals）. Therefore, the objective of this study is to investigate whether real activities manipulation positively influences accruals earnings management. To investigate the issue, this study collected data from Indonesia Stock Exchange （IDX）. Samples of this study are the manufacturing companies. There are 196 firms from the year 2003 to 2007. The results of this study support the research hypothesis that real activities manipulation positively influences accruals ear
