Hyperspectral image change detection (HSI-CD) is one of the main research topics in remote sensing. Theoretically, ground objects can be considered to have changed when their spectral features behave differently. However, practical scenarios, this presupposition does not hold as collected are affected by many factors, such illumination conditions, atmospheric effects, and topographic changes. Inspired intrinsic decomposition, we propose a novel unsupervised deep learning framework based on...

We experimentally report that angle-control dynamics in the nonlinear propagation of images probe, generated four-wave mixing (FWM) and fluorescence signals beams FWM process a cascade three-level, as well two-level atomic systems. It is shown that, by changing angles between pumping fields dressing fields, respectively, characteristics measured including spectra intensity spatial can be controlled to display many effects, electromagnetically induced transparency absorption (EIT EIA,...

MgO and silver-containing (AgMgO, 3.3, 9.1 at% Ag) films were sol-gel coated on titanium to improve its antibacterial property. Thermal analyses of MgAc 2 ·4H O powder revealed that was crystallized at 400 °C. X-ray diffraction analysis showed converted Mg(OH) or Mg 5 (CO 3 ) 4 (OH) during the ageing in air. Silver nanoparticles surface AgMgO identified by scanning electron microscopy x-ray photoelectron spectroscopy. The film about 1.5 um thick. potentiodynamic polarization test Ca-free...

Deep-learning methods rely on massive labeled data, which has become one of the main impediments in hyperspectral image change detection (HSI-CD). To resolve this problem, pseudo-labels generated by traditional are widely used to drive model learning. In paper, we propose a mutual teaching approach with momentum correction for unsupervised HSI-CD cope noise pseudo-labels, is harmful training. First, adopt two structurally identical models simultaneously, allowing them select high-confidence...

In a near-field four-photon correlation measurement, ghost imaging with classical incoherent light is investigated. By applying the Klyshko advanced-wave picture, we consider properties of spatial and find that fourth-order function can be decomposed into multiple lower-order functions. On basis properties, proof-of-principle proposed, effect each part in on also analyzed. addition, similarities differences among by fourth-, second-, third-order correlations are discussed. It shown contrast...

We investigate the spatial images of probe, generated four wave mixing (FWM) signal and accompanying fluorescence spectrum simultaneously in FWM process a cascade three-level atomic system for first time. experimentally observe theoretically three signals versus probe field as well dressing frequency detunings. Utilizing experimental results signals, cross phase modulation relative position between weak strong beams, we analyze characteristics indicated transmission FWM, such focusing or...

With electromagnetically induced transparency-assisted configuration, a four-wave mixing (FWM) process generated from the upper branch of cascade-type three-level atomic system is studied both theoretically and experimentally. Through advantage neglecting absorption FWM signal due to much smaller transition probability two-photon process, we easily observe Autler-Townes effect altering energy levels in such processes. Meanwhile, multiplied line shapes spectrum are investigated by varying...

For the first time, we report a novel two-photon dressed rule in five-level <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">85</sup> Rb atomic system. In comparison with traditional where signals move probe field frequency detuning changing, one indicates that do not coupling changing. The finding is verified by experimentally detected transmitted probe, multi-wave mixing, and fluorescence signals. We also find show Autler-Townes splitting,...

We investigate the fourth-order spatial correlation properties of pseudo-thermal light in photon counting regime, and apply Klyshko advanced-wave picture to describe process four-photon coincidence measurement. deduce theory a proof-of-principle configuration, find that if four randomly radiated photons come from same radiation area are indistinguishable principle, them is 24 times larger than when different areas. In addition, we also show higher-order function can be decomposed into...

Chang'E-3 successfully landed at the north part of Mare Imbrium on 14 December 2013 and Chang'E-4 South Pole's Aitken Basin 3 January 2019. During powered descent phase, information position velocity landers relative to Lunar surface is provided by microwave range sensor, a radar system developed specifically for Chang'E missions. Values backscattering coefficient are an important basis designing sensor system. In this paper, we firstly have estimated according real measured data in mission....

We investigate the interplay between two components of four-wave mixing (FWM) beams in a ladder-type three-level atomic system. The interplay, including shift and splitting FWM their intensity modulation, depends on frequency detuning angles as well powers pump fields. x-directional due to cross-phase modulation y-directional because electromagnetically induced gratings are investigated. Both theoretical experimental results exhibit that spatial separation number signals can be controlled by...

We report our observations on probe transmission, four-wave mixing (FWM), and fluorescence signals with dressing effect in two V-type three-level as well two-level atomic systems. According to the phenomena observed such systems, we find that at same energy level can be affected by hyperfine structure different levels transition dipole moment. also both x- y-directional spatial splittings of beam FWM are greatly effect, which control shift focusing signal. Studies controllable splitting very...

High resolution spaceborne SAR has unique advantages in target recognition and earthquake rescue due to its refined description of characteristics. The is developing from the meter level decimeter level, which brings a huge increase signal bandwidth. traditional analog demodulation or serial digital down-conversion processing methods are no longer suitable for needs. In addition, limited scale onboard chip makes it impossible simply copy into multichannel parallel mode. this paper, novel...