834 research outputs found
Research on a Pulmonary Nodule Segmentation Method Combining Fast Self-Adaptive FCM and Classification
The key problem of computer-aided diagnosis (CAD) of lung cancer is to segment pathologically changed tissues fast and accurately. As pulmonary nodules are potential manifestation of lung cancer, we propose a fast and self-adaptive pulmonary nodules segmentation method based on a combination of FCM clustering and classification learning. The enhanced spatial function considers contributions to fuzzy membership from both the grayscale similarity between central pixels and single neighboring pixels and the spatial similarity between central pixels and neighborhood and improves effectively the convergence rate and self-adaptivity of the algorithm. Experimental results show that the proposed method can achieve more accurate segmentation of vascular adhesion, pleural adhesion, and ground glass opacity (GGO) pulmonary nodules than other typical algorithms
N-(2-Hydroxy-5-nitrophenyl)methanesulfonamide ethanol monosolvate
In the title compound, C7H8N2O5S·C2H6O, the dihedral angle between the aromatic ring and the nitro group is 8.78 (9)° and the S atom is displaced by 0.226 (3) Å from the plane of the aromatic ring. In the crystal, the ethanol molecule is involved in hydrogen bonding to two separate sulfonamide molecules, as a donor in an O—H⋯O interaction and as an acceptor in an N—H⋯O interaction. Weak C—H⋯O hydrogen bonding is also present
Strength-dependent Transition of Graphite Under Shock Condition Resolved by First Principles
The shock strength dependent formation of diamond represents one of the most
intriguing questions in graphite research. Using ab initio DFT-trained carbon
GNN model, we observe a strength-dependent graphite transition under shock. The
poor sliding caused by scarce sliding time under high-strength shock forms
hexagonal diamond with an orientation of (001)G//(100)HD+[010]G//[010]HD; under
low-strength shock, cubic diamond forms after enough sliding time, unveiling
the strength-dependent graphite transition. We provide computational evidence
of the strength-dependent graphite transition from first principles, clarifying
the long-term shock-induced hexagonal formation and structural
strength-dependent trend source
N′-(4-Methoxybenzylidene)-4-nitrobenzohydrazide methanol solvate
The title compound, C15H13N3O4·CH4O, was synthesized from the reaction of 4-methoxybenzaldehyde with 4-nitrobenzohydrazide in methanol. The benzene rings of the Schiff base molecule are nearly coplanar, making a dihedral angle of 7.0 (3)°. The methanol solvent molecules are linked to the Schiff base molecules by N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds, forming chains running parallel to the b axis
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