A dehazing method for flight view images based on transformer and physical priori

Aiming at the problems of local dehazing distortion and incomplete global dehazing of existing algorithms in real airborne cockpit environments, a two-stage dehazing method PhysiFormer combining physical a priori with a Transformer oriented flight perspective was proposed. The first stage used synthetic pairwise data to pre-train the dehazing model. First, a pyramid pooling module (PPM) was introduced in the Transformer for multiscale feature extraction to solve the problem of poor recovery of local details, then a global context fusion mechanism was used to enable the model to better perceive global information. Finally, considering that combining the physical a priori needs to rely on the estimation of the atmosphere light, an encoding-decoding structure based on the residual blocks was used to estimate the atmosphere light, which was then used for dehazing through the atmospheric scattering model for dehazing. The second stage used real images combined with physical priori to optimize the model to better fit the real airborne environment. The experimental results show that the proposed method has better naturalness image quality evaluator (NIQE) and blind/referenceless image spatial quality evaluator (BRISQUE) indexes and exhibits the best dehazing visual effect in the tests of dense haze, non-uniform haze and real haze images, which effectively improves the problems of color distortion and haze residue

catena-Poly[[pyridinecopper(II)]-μ-N-[(2-oxido-1-naphth­yl)methyl­ene]glycinato]

In the title compound, [Cu(C13H9NO3)(C5H5N)], the CuII atom is coordinated in a distorted square-pyramidal geometry, with two N and two O atoms in the basal positions and one O atom in the apical position. The apical Cu—O bond [2.3520 (16) Å] is much longer than the basal Cu—O and Cu—N bonds [1.9139 (14)–2.0136 (17) Å]. The carboxyl­ate group bridges CuII atoms, forming a zigzag chain along the a axis

Polarized electron-beam acceleration driven by vortex laser pulses

We propose a new approach based on an all-optical set-up for generating relativistic polarized electron beams via vortex Laguerre-Gaussian (LG) laser-driven wakefield acceleration. Using a pre-polarized gas target, we find that the topology of the vortex wakefield resolves the depolarization issue of the injected electrons. In full three-dimensional particle-in-cell simulations, incorporating the spin dynamics via the Thomas-Bargmann Michel Telegdi equation, the LG laser preserves the electron spin polarization by more than 80% at high beam charge and flux. The method releases the limit on beam flux for polarized electron acceleration and promises more than an order of magnitude boost in peak flux, as compared to Gaussian beams. These results suggest a promising table-top method to produce energetic polarized electron beams.Comment: We replace some results and revise some description

Effect of cooling pad installation on indoor airflow distribution in a tunnel-ventilated laying-hen house

Extra cooling pads on the sidewalls are needed for larger poultry houses using tunnel ventilation system. Preliminary study showed that the airflow velocity going through different aisles varies greatly when the extra pads are installed at the end of sidewalls, making a “[”-shape air inlet. Combined with field tests, the CFD (computational fluid dynamics) technology was used to study the uniformity of airflow distribution in a tunnel-ventilated laying-hen house. The air distribution was first monitored in a layer house to find the main reason resulting in the variations of airflows in different aisles. Then CFD simulations were carried out with different distances (D=2 m, 3 m or 4 m) between the pads on end-wall and the extra pads on side walls. The field test showed that airflow streams from the different groups of cooling pads collided vertically at the house corners, mixed with each other, then flew towards the center of the house. This was the main reason that the wind speed in the middle aisle was much higher than in other aisles, leaving large zones of lower ventilation in the aisles adjacent to the sidewalls. The results of CFD simulations indicated that air distributions could be significantly improved when the extra pieces of pads were moved away for an appropriate distance from the end cooling pads. As far as conventional poultry house with a span of 12 m, the air speeds in different aisles were more uniform when this distance was about 3 m

Aqua­{N-[1-(2-oxidophen­yl)ethyl­idene]-l-serinato}copper(II) monohydrate

In the title compound, [Cu(C11H11NO4)(H2O)]·H2O, each CuII ion is four-coordinated by one N and two O atoms from the tridentate Schiff base ligand, and by one O atom from the coordinated water mol­ecule in a distorted square-planar geometry. Inter­molecular O—H⋯O hydrogen bonds link complex mol­ecules and solvent water mol­ecules into flattened columns propagated in [100]

{N,N-Dimethyl-N′-[1-(2-pyrid­yl)ethyl­idene]propane-1,3-diamine}bis(thio­cyanato-κN)­copper(II)

In the title complex, [Cu(NCS)2(C12H19N3)], the CuII atom is five-coordinated in a square-pyramidal geometry defined by one pyridine N, one imine N, and one amine N atom of the tridentate Schiff base ligand and two N-bonded thio­cyanate ions (one of the latter occupying the apical site). The three bridging C atoms and the two terminal C atoms of the Schiff base are disordered over two sets of sites, with occupancies of 0.465 (2) and 0.535 (2)

Bis{2-[3-(dimethyl­ammonio)­propyl­imino­methyl-κN]-6-meth­oxy­phenolato-κO 1}bis­(thio­cyanato-κN)nickel(II)

The asymmetric unit of the title complex, [Ni(NCS)2(C13H20N2O2)2], consists of two half-mol­ecules, both of which are completed by crystallographic inversion symmetry (Ni2+ site symmetry = in both cases). Both metal ions are six-coordinated in distorted trans-NiO2N4 geometries arising from two N,O-bidentate Schiff base ligands and two N-bonded thio­cyanate ions. The mol­ecular conformations are reinforced by two intra­molecular N—H⋯O hydrogen bonds

catena-Poly[[[(3,5-dimethyl-1H-pyrazole)­copper(II)]-μ-{N-[1-(2-oxidophen­yl)ethyl­idene]-l-valinato}] methanol monosolvate]

The asymmetric unit of the title compound, {[Cu(C13H15NO3)(C5H8N2)]·CH3OH}n, contains two complex mol­ecules and two solvent mol­ecules. Each CuII ion is in a distorted square-pyramidal coordination with one N and two O atoms from the Schiff base ligand and one N atom from the heterocycle in the basal positions and one carboxyl­ate O atom from a neighbouring ligand in the apical position. The apical Cu—O bonds are much longer than the basal Cu—O and Cu—N bonds. The carboxyl­ate groups of the Schiff base ligands bridge the CuII ions, forming helical chains along [100]. The crystal packing is stabilized by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds

{3-Methyl-2-[(1-oxido-2-naphth­yl)methyl­idene­amino-κ2 O,N]butano­ato-κO}(1H-pyrazole-κN 2)nickel(II)

In either of the two independent mol­ecules within the asymmetric unit of the title compound, [Ni(C16H15NO3)(C3H4N2)], the NiII atom is coordinated by the two N atoms and two O atoms in a distorted square-planar geometry. The crystal packing is stabilized by strong and weak inter­molecular C—H⋯O hydrogen bonds, as well as weak centroid–centroid π-stacking inter­actions [centroid–centroid separation = 3.526 (3) Å]