Results 61 to 70 of about 20,051 (307)

The Approximation Problem for Drift-Diffusion Systems [PDF]

SIAM Review, 1995
This carefully organized review which reflects to some extent the author's work during the past decade is devoted to a systemical study of nonlinear Galerkin approximations with emphasis on the optimal rate of convergence, stability and computational complexity.
openaire   +2 more sources

Fluid Biomarkers of Disease Burden and Cognitive Dysfunction in Progressive Supranuclear Palsy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Identifying objective biomarkers for progressive supranuclear palsy (PSP) is crucial to improving diagnosis and establishing clinical trial and treatment endpoints. This study evaluated fluid biomarkers in PSP versus controls and their associations with regional 18F‐PI‐2620 tau‐PET, clinical, and cognitive outcomes.
Roxane Dilcher, Charles B. Malpas, Stuart J. McDonald, William T. O’Brien, Craig Despott, Kelly L. Bertram, Matthew P. Pase, Lukas Frontzkowski, Meng Law, Terence J. O’Brien, Lucy Vivash   +10 more
wiley   +1 more source

Diffusive approximation of fisher's equation

Computers & Mathematics with Applications, 2000
The Fisher's equation as a relaxation limit of a discrete kinetic model with two speeds, in which the collision term contains a source is considered. The analysis can be directly applied to obtain a numerical approximation to Fisher's equation in terms of the relaxing system.
openaire   +1 more source

Functional and Structural Evidence of Neurofluid Circuit Aberrations in Huntington Disease

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Disrupted neurofluid regulation may contribute to neurodegeneration in Huntington disease (HD). Because neurofluid pathways influence waste clearance, inflammation, and the distribution of central nervous system (CNS)–delivered therapeutics, understanding their dysfunction is increasingly important as targeted treatments emerge.
Kilian Hett, Abigail Dubois, Melanie Leguizamon, Alexander Song, Paula Trujillo, Colin D. McKnight, Ciaran M. Considine, Manus J. Donahue, Daniel O. Claassen   +8 more
wiley   +1 more source

Hybrid fluid-kinetic model for neutral particles in the plasma edge

Nuclear Materials and Energy, 2019
We elaborate a hybrid fluid-kinetic model for neutral particles in the plasma edge. A macro/fluid model with kinetic corrections in the closure terms of the fluid moment equations is solved in the entire domain.
N. Horsten, G. Samaey, M. Baelmans
doaj   +1 more source

Globally optimal parameter estimates for nonlinear diffusions [PDF]

, 2010
This paper studies an approximation method for the log-likelihood function of a nonlinear diffusion process using the bridge of the diffusion. The main result (Theorem 1) shows that this approximation converges uniformly to the unknown likelihood ...
Mijatović, Aleksandar, Schneider, P, Schneider, Paul, Mijatovic, A   +3 more
core   +1 more source

Structure–Function Decoupling of the Sensorimotor and Default Mode Networks in Black Americans With MS

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background and Objectives Multiple sclerosis (MS) exhibits racially disparate rates of disease progression. Black people with MS (B‐PwMS) experience a more severe disease course than non‐Hispanic White people with MS (NHW‐PwMS). Here we investigated structural and functional connectivity as well as structure–function decoupling in the ...
Emilio Cipriano, Giacomo Boffa, Maria Petracca, Marta Ponzano, Nicole Graziano, Claire Wigley, Claire Riley, Jonathan Howard, Pietro Bontempi, Sylvia Klineova, Fred Lublin, Matilde Inglese   +11 more
wiley   +1 more source

Diffusion Approximation with Henyey-Greenstein Phase Function Using UN Method

Süleyman Demirel Üniversitesi Fen-Edebiyat Fakültesi Fen Dergisi, 2015
: U1 and P1 approximations are applied to one-dimensional neutron transport equation and Henyey- Greenstein phase function is used for calculating diffusion length. Numerical results obtained from U1 and P1 approximations are compared with each other for
Ayça ŞİMŞEK YAPAR, Ahmet BÜLBÜL, Hakan ÖZTÜRK   +2 more
doaj  

Baseline Regional Cholinergic Denervation Predicts Cognitive Trajectories in Moderate Parkinson Disease

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Cognitive decline is a disabling and variable feature of Parkinson disease (PD). While cholinergic system degeneration is linked to cognitive impairments in PD, most prior research reported cross‐sectional associations. We aimed to fill this gap by investigating whether baseline regional cerebral vesicular acetylcholine transporter ...
Taylor Brown, Giulia Carli, Prabesh Kanel, Stiven Roytman, Jaimie Barr, Nicolaas I. Bohnen, Roger L. Albin   +6 more
wiley   +1 more source

Combining conformable operator with Elzaki Adomian decomposition and reduced differential transform for time-fractional diffusion equations

Boundary Value Problems
The present paper deals with the numerical solutions of time-fractional diffusion equations that play important roles in modeling anomalous diffusion processes in many physical systems.
Mohammad Alshammari, Saleh Alshammari, Humaira Yasmin, Yousef Jawarneh, Nedal M. Mohammed, Yasir A. Madani   +5 more
doaj   +1 more source