Recent years have seen various rumor diffusion models being assumed in detection of source research the online social network. Diffusion model is arguably considered as a very important and challenging factor for networks, but it less studied. This paper provides an overview three representative schemes modeling pattern propagation well major estimator Independent Cascade-based model, Epidemic-...

A mathematical model is presented for the production of a growth inhibitory factor (GIF) within a multicell spheroid. The model is based on the assumption that the GIF diffuses within the spheroid in a nonlinear spatially dependent manner. This is in contrast with previous models, in which the nonlinearity was assumed in the production term. The results of the new model are compared with those ...

The diffusivities of thrombin and antithrombin III in a heparin-polyvinyl alcohol hydrogel were estimated and used to demonstrate that diffusion limits the effectiveness of the immobilized heparin in the interior of such hydrogels. Diffusivities were calculated from permeabilities and partition coefficients measured with films in a diffusion chamber apparatus. The diffusion coefficients were es...

Diffusion of neutrally buoyant spherical particles in concentrated monodisperse suspensions under simple shear flow is investigated. We consider the case of nonBrownian particles in Stokes flow, which corresponds to the limits of infinite Péclet number and zero Reynolds number. Using an approach based upon ideas of dynamic light scattering we compute selfand gradient diffusion coefficients in t...

The recent deregulation of electricity markets has led to the creation of energy exchanges, where the electricity is freely traded. In this paper, we study the most salient statistical features of electricity prices with a particular attention to the European energy exchanges. These features can be adequately reproduced by the sum-OU model: a model representing the price as a sum of Lévy-driven...

BACKGROUND AND PURPOSE Granulocyte-colony stimulating factor (G-CSF) is used clinically to attenuate neutropenia after chemotherapy. G-CSF acts as a growth factor in the central nervous system, counteracts apoptosis, and is neuroprotective in rodent transient ischemia models. METHODS We assessed the effect of G-CSF on ischemic lesion evolution in a rat permanent-suture occlusion model with di...

High-precision stepped-heating experiments were performed to better characterize helium diffusion from apatite using Durango fluorapatite as a model system. At temperatures below 265øC, helium diffusion from this apatite is a simple, thermally activated process that is independent of the cumulative fraction of helium released and also of the heating schedule used. Across a factor of -4 in grain...

Hinton (in press) recently proposed a learning algorithm called contrastive divergence learning for a class of probabilistic models called product of experts (PoE). Whereas in standard mixture models the “beliefs” of individual experts are averaged, in PoEs the “beliefs” are multiplied together and then renormalized. One advantage of this approach is that the combined beliefs can be much sharpe...

Hinton (in press) recently proposed a learning algorithm called contrastive divergence learning for a class of probabilistic models called product of experts (PoE). Whereas in standard mixture models the “beliefs” of individual experts are averaged, in PoEs the “beliefs” are multiplied together and then renormalized. One advantage of this approach is that the combined beliefs can be much sharpe...