Results 1 to 10 of about 967,777 (294)

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

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.
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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

Apparent diffusion coefficient histogram analysis for predicting neoadjuvant chemoradiotherapy response in patients with rectal cancer

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, Ayşe Erden, İbrahim Ethem Geçim   +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

Rotational and translational self-diffusion in concentrated suspensions of permeable particles [PDF]

, 2011
In our recent work on concentrated suspensions of uniformly porous colloidal spheres with excluded volume interactions, a variety of short-time dynamic properties were calculated, except for the rotational self-diffusion coefficient.
Bogdan Cichocki, Brinkman H. C., Eligiusz Wajnryb, Gerhard Nägele, Gustavo C. Abade, Happel J., Kim S., Maria L. Ekiel-Jeżewska, Nägele G., Pusey P. N.   +9 more
core   +2 more sources