The Experts below are selected from a list of 75324 Experts worldwide ranked by ideXlab platform
Andrei V Ruban - One of the best experts on this subject based on the ideXlab platform.
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Molecular design of the photosystem II light-harvesting antenna: Photosynthesis and photoprotection
Journal of Experimental Botany, 2005Co-Authors: Peter Horton, Andrei V RubanAbstract:The photosystem II (PSII) light-harvesting system carries out two essential functions, the efficient collection of light energy for photosynthesis, and the regulated dissipation of excitation energy in excess of that which can be used. This dual function requires structural and functional flexibility, in which light-harvesting proteins respond to an External Signal, the thylakoid DeltapH, to induce feedback control. This process, referred to as non-photochemical quenching (NPQ) depends upon the xanthophyll cycle and the PsbS protein. In nature, NPQ is heterogeneous in terms of kinetics and capacity, and this adapts photosynthetic systems to the specific dynamic features of the light environment. The molecular features of the thylakoid membrane which may enable this flexibility and plasticity are discussed.
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molecular design of the photosystem ii light harvesting antenna photosynthesis and photoprotection
Journal of Experimental Botany, 2004Co-Authors: Peter Horton, Andrei V RubanAbstract:The photosystem II (PSII) light-harvesting system carries out two essential functions, the efficient collection of light energy for photosynthesis, and the regulated dissipation of excitation energy in excess of that which can be used. This dual function requires structural and functional flexibility, in which light-harvesting proteins respond to an External Signal, the thylakoid DpH, to induce feedback control. This process, referred to as non-photochemical quenching (NPQ) depends upon the xanthophyll cycle and the PsbS protein. In nature, NPQ is heterogeneous in terms of kinetics and capacity, and this adapts photosynthetic systems to the specific dynamic features of the light environment. The molecular features of the thylakoid membrane which may enable this flexibility and plasticity are discussed.
Peter Horton - One of the best experts on this subject based on the ideXlab platform.
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Molecular design of the photosystem II light-harvesting antenna: Photosynthesis and photoprotection
Journal of Experimental Botany, 2005Co-Authors: Peter Horton, Andrei V RubanAbstract:The photosystem II (PSII) light-harvesting system carries out two essential functions, the efficient collection of light energy for photosynthesis, and the regulated dissipation of excitation energy in excess of that which can be used. This dual function requires structural and functional flexibility, in which light-harvesting proteins respond to an External Signal, the thylakoid DeltapH, to induce feedback control. This process, referred to as non-photochemical quenching (NPQ) depends upon the xanthophyll cycle and the PsbS protein. In nature, NPQ is heterogeneous in terms of kinetics and capacity, and this adapts photosynthetic systems to the specific dynamic features of the light environment. The molecular features of the thylakoid membrane which may enable this flexibility and plasticity are discussed.
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molecular design of the photosystem ii light harvesting antenna photosynthesis and photoprotection
Journal of Experimental Botany, 2004Co-Authors: Peter Horton, Andrei V RubanAbstract:The photosystem II (PSII) light-harvesting system carries out two essential functions, the efficient collection of light energy for photosynthesis, and the regulated dissipation of excitation energy in excess of that which can be used. This dual function requires structural and functional flexibility, in which light-harvesting proteins respond to an External Signal, the thylakoid DpH, to induce feedback control. This process, referred to as non-photochemical quenching (NPQ) depends upon the xanthophyll cycle and the PsbS protein. In nature, NPQ is heterogeneous in terms of kinetics and capacity, and this adapts photosynthetic systems to the specific dynamic features of the light environment. The molecular features of the thylakoid membrane which may enable this flexibility and plasticity are discussed.
Wei Song - One of the best experts on this subject based on the ideXlab platform.
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Phase locking of high power relativistic backward wave oscillator using priming effect
Journal of Applied Physics, 2012Co-Authors: Yan Teng, Wei Song, Jun Sun, Renzhen Xiao, Zhimin Song, Ligang Zhang, Zhiqiang Zhang, Lijun Zhang, Yuchuan ZhangAbstract:The phase-locking approach using the priming effect is developed for high power relativistic backward wave oscillators (RBWO). A plasma switch is conceived to avoid the feedback effect. In experiment, multicavity RBWO of 200 MW with the 73 MHz half power bandwidth is phase-locked under the injection power ratio 0.044 for the frequency separation of 20 MHz. We found that it takes more time to reach stable phase-locking than to achieve saturation of RBWO generation. The External Signal of higher power results in the longer time duration of phase locking. Besides phase-locking, the priming effect leads to longer microwave pulse duration.
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inducing phase locking of multiple oscillators beyond the adler s condition
Journal of Applied Physics, 2012Co-Authors: Wei Song, Jun Sun, Renzhen Xiao, Hao Shao, Changhua Chen, Guozhi LiuAbstract:To achieve phase locking of high power microwave oscillators on a relatively weak coupling strength, an inducing phase locking method is investigated. With an External Signal injected from the end of relativistic backward wave oscillator, the frequency and phase of the output microwave is pulling in the starting oscillation process and remaining stable in the later stationary oscillation process. The simulation results indicate that injecting of inducing Signal prior to the onset of natural oscillations is necessary, while the duration of injection, power of injection and locking bandwidth are not limited by classic Adler’s law.
Jun Sun - One of the best experts on this subject based on the ideXlab platform.
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Phase locking of high power relativistic backward wave oscillator using priming effect
Journal of Applied Physics, 2012Co-Authors: Yan Teng, Wei Song, Jun Sun, Renzhen Xiao, Zhimin Song, Ligang Zhang, Zhiqiang Zhang, Lijun Zhang, Yuchuan ZhangAbstract:The phase-locking approach using the priming effect is developed for high power relativistic backward wave oscillators (RBWO). A plasma switch is conceived to avoid the feedback effect. In experiment, multicavity RBWO of 200 MW with the 73 MHz half power bandwidth is phase-locked under the injection power ratio 0.044 for the frequency separation of 20 MHz. We found that it takes more time to reach stable phase-locking than to achieve saturation of RBWO generation. The External Signal of higher power results in the longer time duration of phase locking. Besides phase-locking, the priming effect leads to longer microwave pulse duration.
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inducing phase locking of multiple oscillators beyond the adler s condition
Journal of Applied Physics, 2012Co-Authors: Wei Song, Jun Sun, Renzhen Xiao, Hao Shao, Changhua Chen, Guozhi LiuAbstract:To achieve phase locking of high power microwave oscillators on a relatively weak coupling strength, an inducing phase locking method is investigated. With an External Signal injected from the end of relativistic backward wave oscillator, the frequency and phase of the output microwave is pulling in the starting oscillation process and remaining stable in the later stationary oscillation process. The simulation results indicate that injecting of inducing Signal prior to the onset of natural oscillations is necessary, while the duration of injection, power of injection and locking bandwidth are not limited by classic Adler’s law.
Renzhen Xiao - One of the best experts on this subject based on the ideXlab platform.
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Phase locking of high power relativistic backward wave oscillator using priming effect
Journal of Applied Physics, 2012Co-Authors: Yan Teng, Wei Song, Jun Sun, Renzhen Xiao, Zhimin Song, Ligang Zhang, Zhiqiang Zhang, Lijun Zhang, Yuchuan ZhangAbstract:The phase-locking approach using the priming effect is developed for high power relativistic backward wave oscillators (RBWO). A plasma switch is conceived to avoid the feedback effect. In experiment, multicavity RBWO of 200 MW with the 73 MHz half power bandwidth is phase-locked under the injection power ratio 0.044 for the frequency separation of 20 MHz. We found that it takes more time to reach stable phase-locking than to achieve saturation of RBWO generation. The External Signal of higher power results in the longer time duration of phase locking. Besides phase-locking, the priming effect leads to longer microwave pulse duration.
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inducing phase locking of multiple oscillators beyond the adler s condition
Journal of Applied Physics, 2012Co-Authors: Wei Song, Jun Sun, Renzhen Xiao, Hao Shao, Changhua Chen, Guozhi LiuAbstract:To achieve phase locking of high power microwave oscillators on a relatively weak coupling strength, an inducing phase locking method is investigated. With an External Signal injected from the end of relativistic backward wave oscillator, the frequency and phase of the output microwave is pulling in the starting oscillation process and remaining stable in the later stationary oscillation process. The simulation results indicate that injecting of inducing Signal prior to the onset of natural oscillations is necessary, while the duration of injection, power of injection and locking bandwidth are not limited by classic Adler’s law.
