Considering the large-scale communication delays mainly caused by the large detection arm length with several million kilometers in the heliocentric gravitational-wave detection mission,the attitude-orbit coordinated ...Considering the large-scale communication delays mainly caused by the large detection arm length with several million kilometers in the heliocentric gravitational-wave detection mission,the attitude-orbit coordinated control issue is addressed in this work.Firstly,to describe the formation detection motion in the Sun–Earth system,an attitude-orbit coupled relative motion model of the formation spacecraft is established with the assistance of a virtual structure.Then,a comprehensive model of communication delays caused by the large detection arm length and hardware resource constraints is constructed.Next,to realize the fast convergence of the formation attitude-orbit errors,a reliable and robust integration design of attitude-orbit coordinated control protocol is elaborated by delay-dependent Lyapunov function,in which the unknown lumped disturbances and the aftereffects of large-scale communication delays are suppressed with the adaptive control item and the delay-effect compensation one,respectively.Finally,numerical simulations are constructed with the typical heliocentric gravitational-wave detection mission scenario,verifying the validity and superiority of the proposed method with the existing findings as a comparison.展开更多
In this work,in situ luminescence analysis was applied for the first time for monitoring the phase transitions of calcium phosphate(CaP)and confirmed by synchrotron in situ X-ray diffraction in addition to in situ inf...In this work,in situ luminescence analysis was applied for the first time for monitoring the phase transitions of calcium phosphate(CaP)and confirmed by synchrotron in situ X-ray diffraction in addition to in situ infrared spectroscopy,with simultaneous measurements of pH and ion conductivity.Applying doped Ce^(3+)and Eu^(3+)as local coordination sensors,the high sensitivity of their emission spectra upon the changes in the coordination sphere of the doped cation sites enabled to detect the formation of amorphous calcium phosphate(ACP)and Ca_(5)(PO_(4))_(3)OH,besides their subsequent transitions to CaHPO_(4)·2H_(2)O and Ca_(8)H_(2)(PO_(4))_(6)·5H_(2)O under real reaction conditions.Calcium phosphates are widely present in mammals and understanding their phase transitions is important to comprehend the conversion between healthy and diseased tissues.In situ luminescence measurements are advantageous for allowing monitoring these phase transitions in a fast and sensitive fashion also in conventional laboratories,independent of synchrotron radiation.展开更多
基金supported by the National Key R&D Program of China(2022YFC2204800)Hunan Provincial Natural Science Foundation(2024JJ6482)the Graduate Student Independent Exploration and Innovation Program of Central South University(2025ZZTS0116).
文摘Considering the large-scale communication delays mainly caused by the large detection arm length with several million kilometers in the heliocentric gravitational-wave detection mission,the attitude-orbit coordinated control issue is addressed in this work.Firstly,to describe the formation detection motion in the Sun–Earth system,an attitude-orbit coupled relative motion model of the formation spacecraft is established with the assistance of a virtual structure.Then,a comprehensive model of communication delays caused by the large detection arm length and hardware resource constraints is constructed.Next,to realize the fast convergence of the formation attitude-orbit errors,a reliable and robust integration design of attitude-orbit coordinated control protocol is elaborated by delay-dependent Lyapunov function,in which the unknown lumped disturbances and the aftereffects of large-scale communication delays are suppressed with the adaptive control item and the delay-effect compensation one,respectively.Finally,numerical simulations are constructed with the typical heliocentric gravitational-wave detection mission scenario,verifying the validity and superiority of the proposed method with the existing findings as a comparison.
基金the development of the in situ analysis software as well as the DFG(Priority Program 1415,project BE 1653/29-1,project TE 1147/1-1),Daimler and Benz Foundation and MATsynCELL for the financial support.
文摘In this work,in situ luminescence analysis was applied for the first time for monitoring the phase transitions of calcium phosphate(CaP)and confirmed by synchrotron in situ X-ray diffraction in addition to in situ infrared spectroscopy,with simultaneous measurements of pH and ion conductivity.Applying doped Ce^(3+)and Eu^(3+)as local coordination sensors,the high sensitivity of their emission spectra upon the changes in the coordination sphere of the doped cation sites enabled to detect the formation of amorphous calcium phosphate(ACP)and Ca_(5)(PO_(4))_(3)OH,besides their subsequent transitions to CaHPO_(4)·2H_(2)O and Ca_(8)H_(2)(PO_(4))_(6)·5H_(2)O under real reaction conditions.Calcium phosphates are widely present in mammals and understanding their phase transitions is important to comprehend the conversion between healthy and diseased tissues.In situ luminescence measurements are advantageous for allowing monitoring these phase transitions in a fast and sensitive fashion also in conventional laboratories,independent of synchrotron radiation.
