نتایج جستجو برای: diffusion volume
تعداد نتایج: 469130 فیلتر نتایج به سال:
We explore some fundamental aspects of diffusion in a binary (chemical species A and B) system. The ultimate objective is to better understand the relationship among the various treatments of a one-dimensional diffusion couple when there is volume change on mixing. We begin by examining the relationships among diffusion fluxes that are true irrespective of the nature of constitutive equations. ...
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...
Introduction In this paper we consider cell centered nite di erence approximations for second order convection di usion equations of divergence type Our goal is to construct nite di erence methods of second order of approximation that satisfy the discrete maximum principle The error estimates are in the discrete Sobolev spaces associated with the considered boundary value problem Approximation ...
Submitted for the DPP13 Meeting of The American Physical Society Finite Volume Scheme for Anisotropic Diffusion1 BRAM VAN ES, CWI, Amsterdam, The Netherlands; FOM Institute DIFFER, Nieuwegein, The Netherlands, BARRY KOREN, CWI, Amsterdam, The Netherlands; Eindhoven University of Technology, Eindhoven, The Netherlands, HUGO DE BLANK, FOM Institute DIFFER, Nieuwegein, The Netherlands — In fusion ...
There is still limited knowledge about the relationship between different structural brain parameters, despite huge progress in analysis of neuroimaging data. The aim of the present study was to test the relationship between fractional anisotropy (FA) from diffusion tensor imaging (DTI) and regional white matter (WM) volume. As WM volume has been shown to develop until middle age, the focus was...
Brain morphometry using diffusion-weighted magnetic resonance imaging: application to schizophrenia.
Loss of cortical gray matter is accompanied by a commensurate increase in the sulcal and intraventricular cerebrospinal fluid volume. On diffusion-weighted magnetic resonance imaging, this would be reflected as a higher apparent diffusion coefficient in affected brain regions. On the basis of the above premise, we suggest that the apparent diffusion coefficient may be used as a surrogate marker...
Diffusion anisotropy was investigated in the developing rat brain [postnatal day (P)6-29] with the use of ion-selective microelectrodes to measure the three-dimensional distribution of tetramethylammonium (TMA+) iontophoresed into the extracellular space (ECS). The diffusion parameters, ECS volume fraction alpha (alpha = ECS volume/total tissue volume), tortuosity lambda (lambda2 = apparent dif...
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