Chirality hold broad applications in life sciences,quantum devices,and various other areas.Traditionally,molecular chirality can be characterized by using steady-state circular dichroism spectroscopy.However,the techn...Chirality hold broad applications in life sciences,quantum devices,and various other areas.Traditionally,molecular chirality can be characterized by using steady-state circular dichroism spectroscopy.However,the techniques that can characterize excited state chirality are progressively capturing the public interest as it can provide the dynamic information for chirality generation and transfer.In this review,we focus on the theoretical background and the developmental history of femtosecond time-resolved circular dichroism spectroscopy(TRCD)techniques around the world.Additionally,we provide examples to showcase the utility of these techniques in the analysis of the dynamical molecular chemical structures,the investigation of molecular chirality generation,and the detection of electron spin dynamics in semiconductor quantum dots.展开更多
The wavelength dependence of photoelectron angular distributions （PADs） of two-photon detachment of Cu^- has been directly studied by using the photoelectron map imaging. Results show that for the laser field intens...The wavelength dependence of photoelectron angular distributions （PADs） of two-photon detachment of Cu^- has been directly studied by using the photoelectron map imaging. Results show that for the laser field intensity of 6.0×10^10W/cm^2, PADs exhibit dramatic change with the external field wavelength. Comparison between the experimental observation and the lowest-order perturbation theory prediction indicates that the pattern of PADs can be explained by the interference of the s and d partial waves in the final state. Relative contri- butions of s and d partial waves in the two-photon detachment at different laser wavelengths are obtained.展开更多
He＇s clinical suited acupuncture manipulation is summarized by the famous tradi onal Chinese medical master Prof. HE Pu-ren in his clinical prac ces for almost 70 years,and it is highly favored as ＂flying needle man...He＇s clinical suited acupuncture manipulation is summarized by the famous tradi onal Chinese medical master Prof. HE Pu-ren in his clinical prac ces for almost 70 years,and it is highly favored as ＂flying needle manipula on＂. This manipula on has high requirements on finger strength; it is characterized from techniques for holding needles to needling inser on,and it is painless during needle insertion and the needling responses are rapid; the operations are simple,with high prac cability in clinic,and it can improve working effi ciency and clinical effi cacy.展开更多
Objective To compare differences in therapeutic effects between acupuncture accelerating qi-flow along meridians （AQF） and conventional acupuncture （CA） in treating periarthritis of shoulder to find better acupunc...Objective To compare differences in therapeutic effects between acupuncture accelerating qi-flow along meridians （AQF） and conventional acupuncture （CA） in treating periarthritis of shoulder to find better acupuncture methods. Methods Sixty-four patients were randomly divided into two groups： group AQF, and group CA with 32 cases in each group. Jiānyú （肩髃 LI 15）, Jiānliáo （肩髎 TE 14）, Jiānzhēn （肩贞 SI 9）, Bìnào （臂臑 LI 14）, Qūchí （曲池 LI 11） and Wàiguān （外关 TE 5） on the affected side were used in both groups, and the two acupuncture methods were respectively used in the two groups for consecutive 2 courses. Pain and moving functions of shoulder and ability in daily life （ADL） were used as indices for evaluating therapeutic effects. Results The total effective rate was 96.9% （31/32） and 81.3% （26/32） in group AQF and group CA, respectively, showing superiority of AQF to CA （P〈0.05）. Scores reflecting pain and moving functions of shoulder and ADL were all improved after treatment in both groups （all P〈0.05）, and the improvement in group AQF was more obvious than those in group CA （all P〈0.05）. Conclusion In treating periarthritis of shoulder, the acupuncture accelerating qi-flow along meridians was better than conventional acupuncture in alleviating pain of the shoulder, improving its moving function and elevating abilities in daily life.展开更多
Teleoperation rendezvous and docking can be used as a backup for autonomous rendezvous and docking (RVD) for an unmanned spacecraft or for guiding the chaser docking with an uncooperative target.The inherent teleopera...Teleoperation rendezvous and docking can be used as a backup for autonomous rendezvous and docking (RVD) for an unmanned spacecraft or for guiding the chaser docking with an uncooperative target.The inherent teleoperation time delay is a rigorous problem,especially when the chaser is teleoperated on the ground.To eliminate the effect of time delay,a new approach for teleoperation RVD is studied.The characteristics of teleoperation RVD are analyzed by comparisons with the teleoperation robot and with manually controlled RVD;the relative motion of the chaser is predicted based on the C-W equation;and the processed measure information with time delay through the Kalman filter is utilized to correct the current prediction.Experimental results verify that the approach produces an 18% enhanced success rate of teleoperation RVD compared with direct visual feedback,and consumes less time and fuel.The developed approach also solves the time delay problem effectively.Teleoperation RVD using this method can be applied as a useful backup for autonomous RVD.展开更多
基金funded by the National Natural Science FoundationofChina(No.92156024and No.92356307 to Jinquan Chen)Menghui Jia thanks the Materials Characterization Center and the Office of Laboratory and Equipment of East China Normal University for funding support(ECNUETR2023-13).
文摘Chirality hold broad applications in life sciences,quantum devices,and various other areas.Traditionally,molecular chirality can be characterized by using steady-state circular dichroism spectroscopy.However,the techniques that can characterize excited state chirality are progressively capturing the public interest as it can provide the dynamic information for chirality generation and transfer.In this review,we focus on the theoretical background and the developmental history of femtosecond time-resolved circular dichroism spectroscopy(TRCD)techniques around the world.Additionally,we provide examples to showcase the utility of these techniques in the analysis of the dynamical molecular chemical structures,the investigation of molecular chirality generation,and the detection of electron spin dynamics in semiconductor quantum dots.
基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.21073188）.
文摘The wavelength dependence of photoelectron angular distributions （PADs） of two-photon detachment of Cu^- has been directly studied by using the photoelectron map imaging. Results show that for the laser field intensity of 6.0×10^10W/cm^2, PADs exhibit dramatic change with the external field wavelength. Comparison between the experimental observation and the lowest-order perturbation theory prediction indicates that the pattern of PADs can be explained by the interference of the s and d partial waves in the final state. Relative contri- butions of s and d partial waves in the two-photon detachment at different laser wavelengths are obtained.
文摘He＇s clinical suited acupuncture manipulation is summarized by the famous tradi onal Chinese medical master Prof. HE Pu-ren in his clinical prac ces for almost 70 years,and it is highly favored as ＂flying needle manipula on＂. This manipula on has high requirements on finger strength; it is characterized from techniques for holding needles to needling inser on,and it is painless during needle insertion and the needling responses are rapid; the operations are simple,with high prac cability in clinic,and it can improve working effi ciency and clinical effi cacy.
文摘Objective To compare differences in therapeutic effects between acupuncture accelerating qi-flow along meridians （AQF） and conventional acupuncture （CA） in treating periarthritis of shoulder to find better acupuncture methods. Methods Sixty-four patients were randomly divided into two groups： group AQF, and group CA with 32 cases in each group. Jiānyú （肩髃 LI 15）, Jiānliáo （肩髎 TE 14）, Jiānzhēn （肩贞 SI 9）, Bìnào （臂臑 LI 14）, Qūchí （曲池 LI 11） and Wàiguān （外关 TE 5） on the affected side were used in both groups, and the two acupuncture methods were respectively used in the two groups for consecutive 2 courses. Pain and moving functions of shoulder and ability in daily life （ADL） were used as indices for evaluating therapeutic effects. Results The total effective rate was 96.9% （31/32） and 81.3% （26/32） in group AQF and group CA, respectively, showing superiority of AQF to CA （P〈0.05）. Scores reflecting pain and moving functions of shoulder and ADL were all improved after treatment in both groups （all P〈0.05）, and the improvement in group AQF was more obvious than those in group CA （all P〈0.05）. Conclusion In treating periarthritis of shoulder, the acupuncture accelerating qi-flow along meridians was better than conventional acupuncture in alleviating pain of the shoulder, improving its moving function and elevating abilities in daily life.
文摘Teleoperation rendezvous and docking can be used as a backup for autonomous rendezvous and docking (RVD) for an unmanned spacecraft or for guiding the chaser docking with an uncooperative target.The inherent teleoperation time delay is a rigorous problem,especially when the chaser is teleoperated on the ground.To eliminate the effect of time delay,a new approach for teleoperation RVD is studied.The characteristics of teleoperation RVD are analyzed by comparisons with the teleoperation robot and with manually controlled RVD;the relative motion of the chaser is predicted based on the C-W equation;and the processed measure information with time delay through the Kalman filter is utilized to correct the current prediction.Experimental results verify that the approach produces an 18% enhanced success rate of teleoperation RVD compared with direct visual feedback,and consumes less time and fuel.The developed approach also solves the time delay problem effectively.Teleoperation RVD using this method can be applied as a useful backup for autonomous RVD.
