Results 71 to 80 of about 2,423,805 (191)

Numerical Solution of the Advection-Diffusion Equation Using the Radial Basis Function

JTAM (Jurnal Teori dan Aplikasi Matematika), 2023
The advection-diffusion equation is a form of partial differential equation. This equation is also known as the transport equation. The purpose of this research is to approximatio the solution of advection-diffusion equation  by numerical approach using ...
La Ode Sabran, Mohamad Syafi'i
doaj   +1 more source

Evaluation of the diffusion MRI white matter tract integrity model using myelin histology and Monte-Carlo simulations

NeuroImage, 2020
Quantitative evaluation of brain myelination has drawn considerable attention. Conventional diffusion-based magnetic resonance imaging models, including diffusion tensor imaging and diffusion kurtosis imaging (DKI),11 AD: Axial diffusivity; AK: Axial ...
Zihan Zhou, Qiqi Tong, Lei Zhang, Qiuping Ding, Hui Lu, Laura E. Jonkman, Junye Yao, Hongjian He, Keqing Zhu, Jianhui Zhong   +9 more
doaj   +1 more source

The gradient of diffuse gamma-ray emission in the Galaxy

, 2002
We show that the well-known discrepancy between the radial dependence of the Galactic cosmic ray (CR) nucleon distribution, as inferred most recently from EGRET observations of diffuse gamma-rays above 100 MeV, and of the most likely CR source ...
Breitschwerdt, D., Dogiel, V. A., Voelk, H. J.   +2 more
core   +1 more source

Weighted fast diffusion equations (Part I): Sharp asymptotic rates without symmetry and symmetry breaking in Caffarelli-Kohn-Nirenberg inequalities

, 2016
In this paper we consider a family of Caffarelli-Kohn-Nirenberg interpolation inequalities (CKN), with two radial power law weights and exponents in a subcritical range.
Bonforte, Matteo, Dolbeault, Jean, Muratori, Matteo, Nazaret, Bruno   +3 more
core   +2 more sources

Statistical Study of Electric Pc5 Pulsations in the Inner Magnetosphere Observed by Cluster

Geophysical Research Letters
Ultra‐low frequency (ULF) waves in the Pc5 band are essential for the transport of electrons in the radiation belt and the transport of energy from the solar wind into the magnetosphere.
Li Yan, Wenlong Liu, Dianjun Zhang, Theodore E. Sarris, Xinlin Li, Xin Tong   +5 more
doaj   +1 more source

Rectangular-bore, high-gain laser plasma tube [PDF]

, 1969
Rectangular-bore tube improves population inversion obtained from upper and terminal laser states, resulting in a significant increase in unsaturated gain factor. Radial field produces efficient pumping of upper laser state.
Mollo, R. A.
core   +1 more source

Analytic expressions for ULF wave radiation belt radial diffusion coefficients

Journal of Geophysical Research - Space Physics, 2014
We present analytic expressions for ULF wave‐derived radiation belt radial diffusion coefficients, as a function of L and Kp, which can easily be incorporated into global radiation belt transport models.
L. Ozeke, I. Mann, K. Murphy, I. Jonathan Rae, D. Milling   +4 more
semanticscholar   +1 more source

The Influence of Radial Undersampling Schemes on Compressed Sensing in Cardiac DTI

Sensors, 2018
Diffusion tensor imaging (DTI) is known to suffer from long acquisition time, which greatly limits its practical and clinical use. Undersampling of k-space data provides an effective way to reduce the amount of data to acquire while maintaining image ...
Jianping Huang, Wenlong Song, Lihui Wang, Yuemin Zhu   +3 more
doaj   +1 more source

Investigating the maturation of microstructure and radial orientation in the preterm human cortex with diffusion MRI

NeuroImage, 2017
&NA; Preterm birth disrupts and alters the complex developmental processes in the cerebral cortex. This disruption may be a contributing factor to widespread delay and cognitive difficulties in the preterm population.
Z. Eaton-Rosen, B. Scherrer, A. Melbourne, S. Ourselin, J. Neil, S. Warfield   +5 more
semanticscholar   +1 more source

Nonlinear anomalous diffusion equation and fractal dimension: Exact generalized gaussian solution

, 2002
In this work we incorporate, in a unified way, two anomalous behaviors, the power law and stretched exponential ones, by considering the radial dependence of the $N$-dimensional nonlinear diffusion equation $\partial\rho /\partial{t}={\bf \nabla} \cdot ...
A. C. Scott, A. Compte, A. Compte, A. K. Myers-Beaghton, A. R. Plastino, B. O’Shaughnessy, B. O’Shaughnessy, C. Tsallis, D. A. Stariolo, D. A. Stariolo, E. K. Lenzi, G. Drazer, G. E. Uhlenbeck, H. G. E. Hentschel, H. G. E. Hentschel, H. Spohn, I. T. Pedron, J. Buckmaster, J. G. Berryman, J. Klafer, J. M. Carlson, J. Stephenson, K. Takagoshi, L. Borland, L. Borland, L. C. Malacarne, L. C. Malacarne, L. F. Richardson, M. F. Shlesinger, M. F. Shlesinger, R. Metzler, R. Metzler, R. S. Mendes, S. Martinez   +33 more
core   +1 more source