Results 1 to 10 of about 4,529,073 (321)

Low b-values in apparent diffusion coefficient calculations overestimate diffusion in rectal cancer [PDF]

Acta Oncologica
Background and purpose: The apparent diffusion coefficient (ADC), derived from diffusion-weighted MRI (DWI), is commonly calculated using a monoexponential model.
Johanna A. Hundvin, Marius Bornstein, Anne Negård, Stein H. Holmedal, Sebastian Meltzer, Anne H. Ree, Sara Pilskog, Kathrine R. Redalen   +7 more
doaj   +2 more sources

Role of Apparent Diffusion Coefficient Value and Apparent Diffusion Coefficient Ratio as Prognostic Factors for Prostate Cancer Aggressiveness [PDF]

Diagnostics
Background: Prostate cancer is one of the most prevalent cancers in the male population. To determine the aggressiveness of suspected lesions precisely, predictive models are increasingly being developed using quantitative MRI measurements, and ...
Arvids Buss, Maija Radzina, Mara Liepa, Edgars Birkenfelds, Laura Saule, Karlis Miculis, Madara Mikelsone, Egils Vjaters   +7 more
doaj   +2 more sources

Diffusion Coefficient [PDF]

Catalysis from A to Z, 2020
H. Lehmann, X. Fuentes-Arderiu, L. F. Bertello   +2 more
openaire   +2 more sources

Lattice QCD constraints on the heavy quark diffusion coefficient [PDF]

, 2020
We report progress towards computing the heavy quark momentum diffusion coefficient from the correlator of two chromo-electric fields attached to a Polyakov loop in pure SU(3) gauge theory.
N. Brambilla, V. Leino, P. Petreczky, A. Vairo   +3 more
semanticscholar   +1 more source

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, Moitier, Zoïs, Verfürth, Barbara   +2 more
doaj   +1 more source

Diffusion Coefficient [PDF]

, 2014
Citation: 'diffusion coefficient' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.D01719 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
  +6 more sources

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

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, Le Zhou, Shuang Luo, Yanguang Zhou, Jinglei Yang, Zhigang Li   +5 more
doaj   +1 more source

Direct determination of the diffusion coefficient variation of coal based on Fick's law and model establishment

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, Fenghua AN, Weiwei SU, Hongfu JIA, Xiangjun CHEN   +4 more
doaj   +1 more source

GITT Analysis of Lithium Insertion Cathodes for Determining the Lithium Diffusion Coefficient at Low Temperature: Challenges and Pitfalls

, 2020
Understanding thermodynamic and kinetic properties of electrode materials for Li-ion batteries is of great importance for their optimization and development of novel materials and cell designs. The galvanostatic intermittent titration technique (GITT) is
A. Nickol, T. Schied, C. Heubner, M. Schneider, A. Michaelis, M. Bobeth, G. Cuniberti   +6 more
semanticscholar   +1 more source