6,520 research outputs found
Locating influential nodes via dynamics-sensitive centrality
With great theoretical and practical significance, locating influential nodes
of complex networks is a promising issues. In this paper, we propose a
dynamics-sensitive (DS) centrality that integrates topological features and
dynamical properties. The DS centrality can be directly applied in locating
influential spreaders. According to the empirical results on four real networks
for both susceptible-infected-recovered (SIR) and susceptible-infected (SI)
spreading models, the DS centrality is much more accurate than degree,
-shell index and eigenvector centrality.Comment: 6 pages, 1 table and 2 figure
Nonlinear transport theory for hybrid normal-superconducting devices
We report a theory for analyzing nonlinear DC transport properties of
mesoscopic or nanoscopic normal-superconducting (N-S) systems. Special
attention was paid such that our theory satisfies gauge invariance. At the
linear transport regime and the sub-gap region where the familiar scattering
matrix theory has been developed, we provide confirmation that our theory and
the scattering matrix theory are equivalent. At the nonlinear regime, however,
our theory allows the investigation of a number of important problems: for N-S
hybrid systems we have derived the general nonlinear current-voltage
characteristics in terms of the scattering Green's function, the second order
nonlinear conductance at the weakly nonlinear regime, and nonequilibrium charge
pile-up in the device which defines the electrochemical capacitance
coefficients
Poly[[diaqua(1,10-phenanthroline-κ2 N,N′)(μ3-4-sulfonatobenzene-1,2-dicarboxylato-κ4 O 1:O 2 ,O 2′:O 4)dysprosium(III)] dihydrate]
The 4-sulfophthalate trianion in the polymeric title complex, {[Dy(C8H3O7S)(C12H8N2)(H2O)2]·2H2O}n, bridges three water/phenanthroline-coordinated DyIII atoms to form a three-dimensional network architecture. The metal atom is further chelated by a carboxylate group and is covalently bonded to a monodentate carboxylate group and to a monodentate sulfonate group in a distorted square-antiprismatic geometry. The coordinating and the solvent water molecules are hydrogen bonded to the network. In the crystal, one solvent water molecule is disordered over two positions [major component = 59 (3)%]
An internet reviews topic hierarchy mining method based on modified continuous renormalization procedure
Mining the hierarchical structure of Internet review topics and realizing a
fine classification of review texts can help alleviate users' information
overload. However, existing hierarchical topic classification methods primarily
rely on external corpora and human intervention. This study proposes a Modified
Continuous Renormalization (MCR) procedure that acts on the keyword
co-occurrence network with fractal characteristics to achieve the topic
hierarchy mining. First, the fractal characteristics in the keyword
co-occurrence network of Internet review text are identified using a
box-covering algorithm for the first time. Then, the MCR algorithm established
on the edge adjacency entropy and the box distance is proposed to obtain the
topic hierarchy in the keyword co-occurrence network. Verification data from
the Dangdang.com book reviews shows that the MCR constructs topic hierarchies
with greater coherence and independence than the HLDA and the Louvain
algorithms. Finally, reliable review text classification is achieved using the
MCR extended bottom level topic categories. The accuracy rate (P), recall rate
(R) and F1 value of Internet review text classification obtained from the
MCR-based topic hierarchy are significantly improved compared to four target
text classification algorithms.Comment: 43 pages, 8 figures, conference or other essential inf
trans,trans,trans-Diaquabis(nicotinamide-κN)bis(2-nitrobenzoato-κO)cadmium(II) dihydrate
The cadmium atom in the title compound, [Cd(C7H4NO4)2(C6H6N2O)2(H2O)2]·2H2O, lies on a center of inversion in an all-trans octahedral environment. In the crystal, the complex interacts with the uncoordinated water molecules through O—H⋯O and N—H⋯O hydrogen bonds, forming a layered network
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