1,081 research outputs found
(E)-Methyl N′-[(1H-indol-3-yl)methylidene]hydrazinecarboxylate 0.25-hydrate
The asymmetric unit of the title compound, C11H11N3O2·0.25H2O, contains two independent organic molecules and a water molecule, which lies on a twofold rotation axis. The side chains of the two molecules have slightly different orientations, the C=N—N—C torsion angle being −163.03 (15)° in one and −177.52 (14)° in the other, with each adopting a trans configuration with respect to the C=N bond. In the crystal, molecules are linked into chains extending along b by N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds and in addition, four intermolecular C—H⋯π interactions are present
(E)-2-[(2-Amino-4,5-dibromophenyl)iminomethyl]-6-methoxyphenol
The title compound, C14H12Br2N2O2, was prepared from the condensation of 4,5-dibromo-1,2-phenylenediamine and 2-hydroxy-3-methoxybenzaldehyde in methanol. The N=C double bond shows a trans conformation and the dihedral angle between the aromatic ring planes is 5.9 (4)°. In the crystal structure, there are intramolecular O—H⋯N and N—H⋯N and intermolecular N—H⋯O hydrogen bonds, the latter resulting in inversion dimers
Di-μ-chlorido-bis[chlorido(N,N-dimethylethylenediamine-κ2 N,N′)zinc(II)]
The centrosymmetric dinuclear title compound, [Zn2Cl4(C4H12N2)2], is isostructural with its previously reported CuII analogue [Phelps, Goodman & Hodgson (1976 ▶). Inorg. Chem.
15, 2266–2270]. In the title compound, each of the ZnII ions is coordinated by two N atoms from a chelating N,N-dimethylethylenediamine ligand, two bridging Cl atoms and one terminal Cl atom. The coordination environment is distorted square-pyramidal. The Zn—Cl bond distances of the two bridging Cl atoms are distinctly different: the equatorial Cl atom exbibits a Zn—Cl distance of 2.318 (1) Å and the axial Cl atom exbibits a Zn—Cl distance of 2.747 (2) Å, which is significantly longer. The molecule can thus be seen as a dimer of two nearly square-planar monomeric units which are related to each other by an inversion center located in the middle of the dimer. Within one monomeric unit, the Zn atom, the two N atoms and the two Cl atoms are almost coplanar, with a mean deviation of only 0.05 (1) Å from the associated least-squares plane. The Zn⋯Zn distance within the dimer is 3.472 (3) Å. N—H⋯Cl and C—H⋯Cl hydrogen-bond interactions connect neighboring molecules with each other
Tris(1,10-phenanthroline-κ2 N,N′)iron(II) μ-oxido-bis[trichloridoferrate(III)] ethanol hemisolvate
The title compound, [Fe(C12H8N2)3][Fe2Cl6O]·0.5CH3CH2OH, consists of one [Fe(phen)3]2+ cation (phen = 1,10-phenanthroline), one [Fe2Cl6O]2− anion and one half-molecule of ethanol. In the cation, the FeII atom is coordinated by six N atoms from three phen ligands in a distorted octahedral geometry. In the bent anion, two FeIII atoms are connected by a bridging oxide O atom [bridging angle = 160.6 (4)°], and each FeIII atom is also coordinated by three Cl atoms, completing a distorted tetrahedral geometry
Diaqua{6,6′-dimethoxy-2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato-κ2 O,N,N′,O′}manganese(III) perchlorate 18-crown-6 hemisolvate monohydrate
In the cation of the title compound, [Mn(C18H18N2O4)(H2O)2]ClO4·0.5C12H24O6·H2O, the MnIII ion is coordinated by two water O atoms, and two O atoms and two N atoms from the tetradentate 6,6′-dimethoxy-2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolate ligand, completing a distorted octahedral geometry. One O atom of the 18-crown-6-ether is disordered over two positions with occupancies of 0.70 (2) and 0.30 (2)
Compositor: Bottom-up Clustering and Compositing for Robust Part and Object Segmentation
In this work, we present a robust approach for joint part and object
segmentation. Specifically, we reformulate object and part segmentation as an
optimization problem and build a hierarchical feature representation including
pixel, part, and object-level embeddings to solve it in a bottom-up clustering
manner. Pixels are grouped into several clusters where the part-level
embeddings serve as cluster centers. Afterwards, object masks are obtained by
compositing the part proposals. This bottom-up interaction is shown to be
effective in integrating information from lower semantic levels to higher
semantic levels. Based on that, our novel approach Compositor produces part and
object segmentation masks simultaneously while improving the mask quality.
Compositor achieves state-of-the-art performance on PartImageNet and
Pascal-Part by outperforming previous methods by around 0.9% and 1.3% on
PartImageNet, 0.4% and 1.7% on Pascal-Part in terms of part and object mIoU and
demonstrates better robustness against occlusion by around 4.4% and 7.1% on
part and object respectively. Code will be available at
https://github.com/TACJu/Compositor
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