990 research outputs found
CCPL: Contrastive Coherence Preserving Loss for Versatile Style Transfer
In this paper, we aim to devise a universally versatile style transfer method
capable of performing artistic, photo-realistic, and video style transfer
jointly, without seeing videos during training. Previous single-frame methods
assume a strong constraint on the whole image to maintain temporal consistency,
which could be violated in many cases. Instead, we make a mild and reasonable
assumption that global inconsistency is dominated by local inconsistencies and
devise a generic Contrastive Coherence Preserving Loss (CCPL) applied to local
patches. CCPL can preserve the coherence of the content source during style
transfer without degrading stylization. Moreover, it owns a neighbor-regulating
mechanism, resulting in a vast reduction of local distortions and considerable
visual quality improvement. Aside from its superior performance on versatile
style transfer, it can be easily extended to other tasks, such as
image-to-image translation. Besides, to better fuse content and style features,
we propose Simple Covariance Transformation (SCT) to effectively align
second-order statistics of the content feature with the style feature.
Experiments demonstrate the effectiveness of the resulting model for versatile
style transfer, when armed with CCPL.Comment: Accepted by ECCV2022 as an oral paper; code url:
https://github.com/JarrentWu1031/CCPL Video demo:
https://youtu.be/scZuJCXhL1
5-Phenyl-3,4,4a,5,6,12c-hexahydro-2H-benzo[f]pyrano[3,2-c]quinoline
In the title compound, C22H21N, the pyridine ring adopts a distorted boat conformation, while the adjacent pyran ring adopts a chair conformation; the heterocyclic rings make a dihedral angle of 40.1 (2)° with each other
2-[3-(2-Chlorophenyl)-5-oxo-1,5-diphenylpentylidene]malononitrile
In the title compound, C26H19ClN2O, the 2-chlorophenyl group forms dihedral angles of 59.6 (1) and 31.9 (1)° with the phenyl rings. The two phenyl rings are inclined at a dihedral angle of 32.9 (1)° with respect to each other. In the crystal, an intermolecular C—H⋯N hydrogen bond links the molecules into a polymeric chain running along the c axis
Poly[diaquabis(μ2-azido-κ2 N 1:N 1)bis(μ3-1-oxoisonicotinato-κ3 O:O′:O′′)dicadmium(II)]
In the title compound, [Cd2(C6H4NO3)2(N3)2(H2O)2]n, one CdII atom is located on an inversion center and is coordinated by four O atoms from four bridging 1-oxoisonicotinate ligands and two N atoms of two bridging azide ligands in a slightly distorted octahedral geometry. The other CdII atom, also lying on an inversion center, is coordinated by four O atoms from two bridging 1-oxoisonicotinate ligands and two water molecules and two N atoms of two bridging azide ligands in a slightly distorted octahedral geometry. The Cd atoms are connected via the 1-oxoisonicotinate and azide ligands into a two-dimensional coordination network. The crystal structure involves O—H⋯N and O—H⋯O hydrogen bonds
Kinematics of the Broad-line Region of 3C 273 from a Ten-year Reverberation Mapping Campaign
Despite many decades of study, the kinematics of the broad-line region of
3C~273 are still poorly understood. We report a new, high signal-to-noise,
reverberation mapping campaign carried out from November 2008 to March 2018
that allows the determination of time lags between emission lines and the
variable continuum with high precision. The time lag of variations in H
relative to those of the 5100 Angstrom continuum is days
in the rest frame, which agrees very well with the Paschen- region
measured by the GRAVITY at The Very Large Telescope Interferometer. The time
lag of the H emission line is found to be nearly the same as for
H. The lag of the Fe II emission is days, longer
by a factor of 2 than that of the Balmer lines. The velocity-resolved lag
measurements of the H line show a complex structure which can be
possibly explained by a rotation-dominated disk with some inflowing radial
velocity in the H-emitting region. Taking the virial factor of , we derive a BH mass of and an accretion rate of from the
H line. The decomposition of its images yields a host stellar mass
of , and a ratio of in agreement with the Magorrian relation. In the near
future, it is expected to compare the geometrically-thick BLR discovered by the
GRAVITY in 3C 273 with its spatially-resolved torus in order to understand the
potential connection between the BLR and the torus.Comment: 17 pages, 12 figures, 6 tables, accepted for publication in The
Astrophysical Journa
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