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A THRESHOLD-FREE FILTERING ALGORITHM FOR AIRBORNE LIDAR POINT CLOUDS BASED ON EXPECTATION-MAXIMIZATION
Airborne LiDAR Point clouds Filtering Ground points Expectation-maximization Intensity
2018/5/14
Filtering is a key step for most applications of airborne LiDAR point clouds. Although lots of filtering algorithms have been put forward in recent years, most of them suffer from parameters setting o...
Ultrasolitons: multistability and subcritical power threshold from higher-order Kerr terms
Ultrasolitons multistability and subcritical power threshold higher-order Kerr terms Pattern Formation and Solitons
2012/4/27
We show that an optical system involving competing higher-order Kerr nonlinearities can support the existence of ultrasolitons, namely extremely localized modes that only appear above a certain thresh...
Perturbation Theory for PT-Symmetric Sinusoidal Optical Lattices at the Symmetry-Breaking Threshold
PT-Symmetric Sinusoidal Optical the Symmetry-Breaking Threshold
2011/8/31
The PT symmetric potential V0[cos(2x/a)+i sin(2x/a)] has a completely real spectrum for ≤ 1, and begins to develop complex eigenvalues for > 1. At the
symmetry-breaking threshold = 1 some of...
Low-threshold directional plasmon lasing assisted by spatially coherent surface plasmon polaritons
Low-threshold plasmon
2011/9/2
We theoretically propose directional, low-threshold plasmon lasing in both the near-infrared and visible wavelengths by utilizing spatially coherent surface plasmon polaritons on a meta-surface.The ga...
Measurement of $e^+e^-\to D_s^{(*)+} D_s^{(*)-}$ cross sections near threshold using initial-state radiation
$e^+e^-\to D_s^{(*)+} D_s^{(*)-}$ cross sections threshold initial-state radiation
2011/1/4
We report a measurement of exclusive e+e− ! D()+s D()− s cross sections as a function of center-of-mass energy near D()+ s D()− s threshold with initial-state radiation. The anal...
Strong-field above-threshold photoemission from sharp metal tips
Strong-field above-threshold photoemission sharp metal tips
2010/10/20
We present energy-resolved measurements of electron emission from sharp metal tips driven with
low energy pulses from a few-cycle laser oscillator. We observe above-threshold photoemission with a pho...