2,044 research outputs found
On the momentum-dependence of -nuclear potentials
The momentum dependent -nucleus optical potentials are obtained based
on the relativistic mean-field theory. By considering the quarks coordinates of
meson, we introduced a momentum-dependent "form factor" to modify the
coupling vertexes. The parameters in the form factors are determined by fitting
the experimental -nucleus scattering data. It is found that the real
part of the optical potentials decrease with increasing momenta, however
the imaginary potentials increase at first with increasing momenta up to
MeV and then decrease. By comparing the calculated mean
free paths with those from / scattering data, we suggested that the
real potential depth is MeV, and the imaginary potential parameter
is MeV.Comment: 9 pages, 4 figure
STAND: A Spatio-Temporal Algorithm for Network Diffusion Simulation
Information, ideas, and diseases, or more generally, contagions, spread over
space and time through individual transmissions via social networks, as well as
through external sources. A detailed picture of any diffusion process can be
achieved only when both a good network structure and individual diffusion
pathways are obtained. The advent of rich social, media and locational data
allows us to study and model this diffusion process in more detail than
previously possible. Nevertheless, how information, ideas or diseases are
propagated through the network as an overall process is difficult to trace.
This propagation is continuous over space and time, where individual
transmissions occur at different rates via complex, latent connections.
To tackle this challenge, a probabilistic spatiotemporal algorithm for
network diffusion (STAND) is developed based on the survival model in this
research. Both time and spatial distance are used as explanatory variables to
simulate the diffusion process over two different network structures. The aim
is to provide a more detailed measure of how different contagions are
transmitted through various networks where nodes are geographic places at a
large scale
Optimization of scale-free network for random failures
It has been found that the networks with scale-free distribution are very
resilient to random failures. The purpose of this work is to determine the
network design guideline which maximize the network robustness to random
failures with the average number of links per node of the network is constant.
The optimal value of the distribution exponent and the minimum connectivity to
different network size are given in this paper. Finally, the optimization
strategy how to improve the evolving network robustness is given.Comment: 6 pages, 1 figur
Optimization of robustness of scale-free network to random and targeted attacks
The scale-fee networks, having connectivity distribution (where is the site connectivity), is very resilient to random
failures but fragile to intentional attack. The purpose of this paper is to
find the network design guideline which can make the robustness of the network
to both random failures and intentional attack maximum while keeping the
average connectivity per node constant. We find that when $=3$ the
robustness of the scale-free networks reach its maximum value if the minimal
connectivity $m=1$, but when is larger than four, the networks will
become more robust to random failures and targeted attacks as the minimal
connectivity gets larger
2-Methoxy-N′-(2-methoxybenzylidene)benzohydrazide
The title Schiff base compound, C16H16N2O3, was derived from the condensation of 2-methoxybenzaldehyde with 2-methoxybenzohydrazide in an ethanol solution. The dihedral angle between the two aromatic rings is 87.5 (3)°. In the crystal structure, the molecules are linked into chains running parallel to the a axis by intermolecular N—H⋯O hydrogen bonds
Multiplex Limited Penetrable Horizontal Visibility Graph from EEG Signals for Driver Fatigue Detection
This work was supported by National Natural Science Foundation of China under Grant Nos. 61473203, 61873181 and the Natural Science Foundation of Tianjin, China under Grant No. 16JCYBJC18200.Peer reviewedPostprin
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