The Papua New Guinea-Solomon(PN-SL)arc is one of the regions with active crustal motions and strong geological actions.Thus,its complex subduction system makes it an ideal laboratory for studying the initiation mechan...The Papua New Guinea-Solomon(PN-SL)arc is one of the regions with active crustal motions and strong geological actions.Thus,its complex subduction system makes it an ideal laboratory for studying the initiation mechanism of plate subduction.However,the PN-SL subduction system has not yet been sufficiently studied,and its density structure has yet to be revealed.In this paper,we used the free-air gravity data,Parker-Oldenburg density surface inversion method,and the genetic algorithm density inversion method to obtain the density structure of an approximately 1000-km-long northwest-southeast line crossing the PN-SL subduction system under the constraints of the CRUST1.0 global crustal model,onshore seismic data,and the LLNL-G3Dv3 global P-wave velocity model.The density structure shows that density differences between the plates on the two sides of the trench could play a significant role in plate subduction.展开更多
The elimination of transverse wavevectors during the propagation of electromagnetic waves is highly desirable because this would have a wide range of applications in probing,imaging,and communication.In this research,...The elimination of transverse wavevectors during the propagation of electromagnetic waves is highly desirable because this would have a wide range of applications in probing,imaging,and communication.In this research,we propose and experimentally demonstrate a simple method to suppress transverse wavevectors by using coherent wave combinations.Using theoretical analysis and numerical simulation,we show that transverse wavevectors can be greatly suppressed during propagation.For further verification,we perform experiments with light waves to realize coherently combined beams;our experimental results are in good agreement with the simulated results.More importantly,we generate pin-like optical beams using this method,and pin-like optical beams exhibit superior propagation behavior over conventional Gaussian beams in turbulent fluids.展开更多
基金the National Natural Science Foundation of China(Nos.91858215,42076224)。
文摘The Papua New Guinea-Solomon(PN-SL)arc is one of the regions with active crustal motions and strong geological actions.Thus,its complex subduction system makes it an ideal laboratory for studying the initiation mechanism of plate subduction.However,the PN-SL subduction system has not yet been sufficiently studied,and its density structure has yet to be revealed.In this paper,we used the free-air gravity data,Parker-Oldenburg density surface inversion method,and the genetic algorithm density inversion method to obtain the density structure of an approximately 1000-km-long northwest-southeast line crossing the PN-SL subduction system under the constraints of the CRUST1.0 global crustal model,onshore seismic data,and the LLNL-G3Dv3 global P-wave velocity model.The density structure shows that density differences between the plates on the two sides of the trench could play a significant role in plate subduction.
文摘The elimination of transverse wavevectors during the propagation of electromagnetic waves is highly desirable because this would have a wide range of applications in probing,imaging,and communication.In this research,we propose and experimentally demonstrate a simple method to suppress transverse wavevectors by using coherent wave combinations.Using theoretical analysis and numerical simulation,we show that transverse wavevectors can be greatly suppressed during propagation.For further verification,we perform experiments with light waves to realize coherently combined beams;our experimental results are in good agreement with the simulated results.More importantly,we generate pin-like optical beams using this method,and pin-like optical beams exhibit superior propagation behavior over conventional Gaussian beams in turbulent fluids.
