We consider a charged quantum particle in a random magnetic field with Gaussian, delta-correlated statistics. We show that although the single particle properties are peculiar, two particle quantities such as the diffusion constant can be calculated in perturbation theory. We map the problem onto a non-linear sigma-model for Q-matrices of unitary symmetry with renormal-ized diffusion coefficien...

It is commonly assumed that coffee particles swell during filtration, but it has not been clarified how different degrees of swelling affect the extraction. In this article, we propose a grain model to investigate influences on both intra-grain and inter-grain transport. The modeled through diffusion process excess water into grains. geometric expansion grains connected local concentration spec...

objective(s) theophylline, a xanthenes derivative, is still widely used as an effective bronchodilator in the management of asthmatic patients. it is used both as a prophylactic drug and to prevent acute exacerbations of asthma. the aim of study was to formulate and evaluate effect of the microencapsulation of theophylline loaded nanoparticles on the reduction of burst release. materials and me...

Abstract The present study revealed for the first time removal of hexavalent chromium Cr(VI) with a high efficiency using an eco-friendly composite beads alginate green alga Ulva fasciata compared to calcium beads. This conclusion was reached in this from comparison by well-known biosorbent material, (CA) studied alginate/ (CA/UF) biocomposite characterization prepared achieved several techniqu...

Sorption kinetics The model assumes that three chemical phases of PCBs are in equilibrium. As EPA points out, this is a common modeling assumption, but I believe it is only reasonable within a stationary sediment bed, and not within the water column during sediment resuspension. Following Wu and Gschwend (1986), and focusing only on sorption and desorption among two phases (sorbed PCB with conc...

This study analyzes the dynamics of intra-organizational innovation implementation processes based on conversion within and migration between groups. We employ a diffusion model that extends often-used epidemic models in three ways: (1) repeated acceptance and rejection decisions of adopters and non-adopters, (2) diffusion within and across groups organized in different network structures and (...

Objective(s) Theophylline, a xanthenes derivative, is still widely used as an effective bronchodilator in the management of asthmatic patients. It is used both as a prophylactic drug and to prevent acute exacerbations of asthma. The aim of study was to formulate and evaluate effect of the microencapsulation of theophylline loaded nanoparticles on the reduction of burst release. Materials and Me...

Fractional anisotropy (FA) and mean diffusivity (MD) are the most frequently used metrics to investigate white matter impairments in mental disorders. However, these two metrics are derived from intra-voxel analyses and only reflect the diffusion properties solely within the voxel unit. Local diffusion homogeneity (LDH) is a newly developed inter-voxel metric which quantifies the local coherenc...

In diffusion tensor imaging (DTI) the anisotropic movement of water is exploited to characterize microstructure. One confounding issue of DTI is the presence of intra- and extracellular components contributing to the measured diffusivity. This causes an ambiguity in determining the underlying cause of diffusion properties, particularly the fractional anisotropy (FA). In this study an intracellu...

We want to investigate the stochastic parameters, drift and diffusion, in Fényes’ and Nelson’s approach of stochastic mechanics. In contrast to the postulate of a constant diffusion parameter, we consider coordinate dependent alternatives. Therefore, we assume that the trajectory of a particle can be described by a continuous stochastic process with spaceand/or time-dependent diffusion. For an ...