Results 11 to 20 of about 248,487 (165)
Low b-values in apparent diffusion coefficient calculations overestimate diffusion in rectal cancer [PDF]
Acta OncologicaBackground and purpose: The apparent diffusion coefficient (ADC), derived from diffusion-weighted MRI (DWI), is commonly calculated using a monoexponential model.
Johanna A. Hundvin +7 more
doaj +2 more sources
Nonlinear Helmholtz equations with sign-changing diffusion coefficient
Comptes Rendus. Mathématique, 2022 In this paper, we study nonlinear Helmholtz equations with sign-changing diffusion coefficients on bounded domains. The existence of an orthonormal basis of eigenfunctions is established making use of weak $\mathtt{T}$-coercivity theory.
Mandel, Rainer +2 more
doaj +1 more source
Diffusion Coefficient of Oxyhæmoglobin [PDF]
Nature, 1962 IN work described elsewhere1 we showed how to understand the steady-state transport of oxygen through haemoglobin solution by the application of Fick's law of mass transport. The oxygen flux was shown to depend not only on the pressure difference across the diffusion cell but also on the absolute partial pressures of oxygen at the cell boundaries. This
I, FATT, R G, LA FORCE
openaire +2 more sources
Diffusion coefficient of ions through graphene nanopores
AIP Advances, 2022 In this work, we investigate the transport of ions through graphene nanopores driven by concentration gradients through molecular dynamics simulations. The diffusion coefficients, D, of K+ and Cl− are computed for various pore sizes and porosities. It is
Biyuan Liu +5 more
doaj +1 more source
Mathematical Model for Effective Gas Diffusion Coefficient in Multi-scale Fractal Porous Media [PDF]
E3S Web of Conferences, 2021 Based on the capillary hypothesis and fractal theory, a mathematical model for calculating the effective gas diffusion coefficient in porous media is established. By using fractal geometry theory, pore area fractal dimension, tortuosity fractal dimension
Zhehua Du
doaj +1 more source
Meitan kexue jishu, 2023 Gas diffusion ability directly affects gas exploitation, outburst risk, emission and content determination. In order to study the influence of stress, gas pressure and temperature on gas diffusion coefficient in coal, the gas diffusion coefficient in ...
Yujin QIN +4 more
doaj +1 more source
Diagnostic and Interventional Radiology, 2022 PURPOSEThis study aimed to retrospectively evaluate the apparent diffusion coefficient (ADC) histograms in predicting chemoradiotherapy (CRT) response in patients with locally advanced rectal cancer (LARC).METHODSA total of 51 patients who underwent ...
Andelib Babatürk +2 more
doaj +1 more source
Diffusion curves with diffusion coefficients
Computational Visual Media, 2018 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Hongwei Lin, Jingning Zhang, Chenkai Xu
openaire +2 more sources
Neutrons diffusion variable coefficient advection in nuclear reactors
International Journal of Advanced Nuclear Reactor Design and Technology, 2021 The analysis of nuclear reactors in dissimilar geometries is an important topic in sciences and engineering. Two approaches are used in literature for homogeneous systems: computational and analytical methods.
Rami Ahmad El-Nabulsi
doaj +1 more source
From the diffusion coefficient to the diffusion tensor [PDF]
NMR in Biomedicine, 2002 AbstractWith diffusion tensor MRI one has access to the organization in space of tissue microstructural components. This outstanding potential adds, however, another layer of complexity to the diffusion MRI data acquisition and analysis processes. Over the last few years many articles have been published dealing with those matters.
Le Bihan, Denis, van Zijl, Peter
openaire +3 more sources