Multicomponent diffusion coefficient determination in metallurgy by a reduced adjoint system

Freeform determination of a nonlinear diffusion coefficient by a reduced adjoint system

In this article we deal with the determination of a diffusion coefficient function in a quasi-linear parabolic system. The motivation comes from a metallurgy setting. The solution method is based on the output least-squares approach (ols) with minimization applying the adjoint equation. As the diffusion coefficient has an a-priori unknown form, we apply freeform determination in which the coeff...

Reduced apparent diffusion coefficient in neuromyelitis optica-associated optic neuropathy.

I n their excellent review of neuromyelitis optica (NMO), Morrow and Wingerchuk (1) discuss the criteria that distinguish this condition from multiple sclerosis. Here, we describe diffusion-weighted magnetic resonance imaging (DWI) of the optic nerve in a patient with NMO-associated optic neuropathy. A 21-year-old man developed vision loss in the right eye that was diagnosed as optic neuritis. ...

Determination of the diffusion coefficient of hydrogen ion in hydrogels.

The role of diffusion in chemical pattern formation has been widely studied due to the great diversity of patterns emerging in reaction-diffusion systems, particularly in H+-autocatalytic reactions where hydrogels are applied to avoid convection. A custom-made conductometric cell is designed to measure the effective diffusion coefficient of a pair of strong electrolytes containing sodium ions o...

Determination of 222Rn Diffusion Coefficient in Japanese Soils

Department of Nuclear Engineering, Graduate School of Enginering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan ABSTRACT Radon (Rn) diffusion coefficient as one of some important parameters of Rn transport in the soil has been measured using soil radon diffusion monitor (SRDM). The system of SRDM consists of two scintillation detectors, sample container located between these detectors,...

Determination of the Lithium Ion Diffusion Coefficient in Graphite