In the quantum metrology,applications of quantum techniques based on entanglement bring in some better performances than conventional approaches.We experimentally investigate an application of entanglement in accurate...In the quantum metrology,applications of quantum techniques based on entanglement bring in some better performances than conventional approaches.We experimentally investigate an application of entanglement in accurate ranging based on the second-order coherence in the time domain.By a fitting algorithm in the data processing,the optimization results show a precision of±200μm at a distance of 1043.3 m.In addition,the influence of jamming noise on the ranging scheme is studied.With some different fitting parameters,the result shows that the proposed scheme has a powerful anti-jamming capability for white noise.展开更多
A novel approach is proposed towards the design of fiber Bragg gratings with multi-channel right-angled triangular spectrum.Firstly,a single-channel grating is synthesized utilizing an adaptive quantum particle swarm ...A novel approach is proposed towards the design of fiber Bragg gratings with multi-channel right-angled triangular spectrum.Firstly,a single-channel grating is synthesized utilizing an adaptive quantum particle swarm optimization with the piecewise constant mutated factor.Meanwhile,the reflectivity spectrum with good linear edge for a short grating is obtained.Then,for its merits of easy fabrication,the superposition method is adopted to design multi-channel gratings with initial spectral distortion.Finally,this distortion is optimized by the method in the first step.It is shown that the design outcomes still retain the features of easy fabrication and short length.Such gratings would be useful as wavelength-interrogation devices with multiple physical parameters in optical sensor systems.展开更多
Four prenylated flavonoids compounds 1-4,named sinopodophyllines A-D,and a flavonoid glycoside(compound 13),sinopodophylliside A,together with 19 known compounds(compounds 5-12 and 14-24) were isolated from the fruits...Four prenylated flavonoids compounds 1-4,named sinopodophyllines A-D,and a flavonoid glycoside(compound 13),sinopodophylliside A,together with 19 known compounds(compounds 5-12 and 14-24) were isolated from the fruits of Sinopodophyllum hexandrum.The structures of new compounds were elucidated by extensive spectroscopic analysis,including HRESIMS,1D and 2D NMR.Compounds 1-6,9-11,and 14-17 were tested for their cytotoxicity against human breast-cancer T47 D,MCF-7 and MDA-MB-231 cells in vitro,and compounds 2,5,6,10 and 11 showed significant cytotoxicity(IC50 values < 10 μmol·L^(-1))against T47 D cells.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 61170228.
文摘In the quantum metrology,applications of quantum techniques based on entanglement bring in some better performances than conventional approaches.We experimentally investigate an application of entanglement in accurate ranging based on the second-order coherence in the time domain.By a fitting algorithm in the data processing,the optimization results show a precision of±200μm at a distance of 1043.3 m.In addition,the influence of jamming noise on the ranging scheme is studied.With some different fitting parameters,the result shows that the proposed scheme has a powerful anti-jamming capability for white noise.
基金Supported by National Science Foundation of China under Grant Nos 60977034,61107036,11004043,11274083in part by China Postdoctoral Science Foundation under Grant Nos 20110491092,2012T50354.
文摘A novel approach is proposed towards the design of fiber Bragg gratings with multi-channel right-angled triangular spectrum.Firstly,a single-channel grating is synthesized utilizing an adaptive quantum particle swarm optimization with the piecewise constant mutated factor.Meanwhile,the reflectivity spectrum with good linear edge for a short grating is obtained.Then,for its merits of easy fabrication,the superposition method is adopted to design multi-channel gratings with initial spectral distortion.Finally,this distortion is optimized by the method in the first step.It is shown that the design outcomes still retain the features of easy fabrication and short length.Such gratings would be useful as wavelength-interrogation devices with multiple physical parameters in optical sensor systems.
基金supported by Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine(No.2010JZ-W-01)Ministry of Education,PRC,and National Key Technology R&D Program“New Drug Innovation”of China(Nos.2009ZX09308-004,2013ZX09103002-006)
文摘Four prenylated flavonoids compounds 1-4,named sinopodophyllines A-D,and a flavonoid glycoside(compound 13),sinopodophylliside A,together with 19 known compounds(compounds 5-12 and 14-24) were isolated from the fruits of Sinopodophyllum hexandrum.The structures of new compounds were elucidated by extensive spectroscopic analysis,including HRESIMS,1D and 2D NMR.Compounds 1-6,9-11,and 14-17 were tested for their cytotoxicity against human breast-cancer T47 D,MCF-7 and MDA-MB-231 cells in vitro,and compounds 2,5,6,10 and 11 showed significant cytotoxicity(IC50 values < 10 μmol·L^(-1))against T47 D cells.
