Results 101 to 110 of about 19,658 (300)

Observations and nonstandard FRW models

The Astrophysical Journal, 1987
The observational predictions of various nonstandard cosmological models which have an FRW metric as their space-time geometry are investigated. The general numerical predictions of the models are found to be in accord with actual observations; in particular, they predict a current relative velocity of the Galaxy with respect to the CMB consistent with
openaire   +1 more source

A highly accurate numerical method for solving boundary value problem of generalized Bagley‐Torvik equation

Mathematical Methods in the Applied Sciences, EarlyView.
A highly accurate numerical method is given for the solution of boundary value problem of generalized Bagley‐Torvik (BgT) equation with Caputo derivative of order 0<β<2$$ 0<\beta <2 $$ by using the collocation‐shooting method (C‐SM). The collocation solution is constructed in the space Sm+1(1)$$ {S}_{m+1}^{(1)} $$ as piecewise polynomials of degree at ...
Suzan Cival Buranay, Mtema James Chin, Nazim I. Mahmudov   +2 more
wiley   +1 more source

Computational Tools for Cohomology of Toric Varieties

Advances in High Energy Physics, 2011
Novel nonstandard techniques for the computation of cohomology classes on toric varieties are summarized. After an introduction of the basic definitions and properties of toric geometry, we discuss a specific computational algorithm for the determination
Ralph Blumenhagen, Benjamin Jurke, Thorsten Rahn   +2 more
doaj   +1 more source

Testing for zero-modification in count regression models [PDF]

, 2006
Count data often exhibit overdispersion and/or require an adjustment for zero outcomes with respect to a Poisson model. Zero-modified Poisson (ZMP) and zero-modified generalized Poisson (ZMGP) regression models are useful classes of models for such ...
Min, Aleksey, Czado, Claudia
core   +1 more source

Numerical Investigation of a Diffusive SIR Model: Focus on Positivity Preservation

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT In this paper, we consider a system of semilinear partial differential equations (PDEs) representing a spatially extended SIR epidemic model. A brief analytical investigation of the well‐posedness and positivity of the solutions is provided in the appendix, while the main focus is on the numerical treatment of the model.
Rahele Mosleh, Claudia Panico, Messoud Efendiyev   +2 more
wiley   +1 more source

Nonstandard working schedules and health: the systematic search for a comprehensive model [PDF]

, 2015
Background: Theoretical models on shift work fall short of describing relevant health-related pathways associated with the broader concept of nonstandard working schedules.
Allard J. van der Beek, Huysmans, M.A., Suzanne L. Merkus, Maaike A. Huysmans, van Mechelen, W., van der Beek, A.J., Kari Anne Holte, Holte, K.A., Merkus, S.L., Willem van Mechelen   +9 more
core   +1 more source

SelExNet: A Self‐Supervised Physics‐Informed Framework for Multi‐Channel Joint RF and Gradient Waveform Optimization in 2D Spatially Selective Excitation

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To introduce SelExNet: a self‐supervised framework for two‐dimensional spatially selective excitation that jointly optimizes radiofrequency (RF) pulses and gradient waveforms, and extends to multi‐channel transmission MRI. Methods Building on prior RF‐only and joint RF‐gradient optimization approaches, SelExNet couples neural RF and ...
Yuliang Xiao, Jason Rock, Zhe Wu, Jamie Near, Mark Chiew, Simon J. Graham   +5 more
wiley   +1 more source

Nonstandard Work Schedules and Father Involvement Among Resident and Nonresident Fathers

, 2019
OBJECTIVE: We examined associations between resident and nonresident fathers’ nonstandard work schedules, work hours, and their level of involvement with their young children in the United States.
Alejandra Ros Pilarz, Drazen, Yonah, Laura Cuesta, Pilarz, Alejandra Ros, Yonah Drazen, Cuesta, Laura   +5 more
core   +1 more source

Cochlear Implant Complications and Outcomes: National Trends of the MAUDE Database From 2016 to 2024

Otolaryngology–Head and Neck Surgery, EarlyView.
Abstract Objective As cochlear implant (CI) use expands, complications have become a growing concern. While prior studies analyzed CI failures, few have comprehensively assessed national complication temporal patterns and clinical outcomes. This study evaluates patient and device complication patterns and outcomes from 2016 to 2024.
Daniel R. S. Habib, Anthony E. Bishay, Michael W. S. Habib, Ankita Patro, Alexander J. Langerman, Aaron C. Moberly, David S. Haynes, Kareem O. Tawfik   +7 more
wiley   +1 more source

A Positivity-Preserving Numerical Scheme for Nonlinear Option Pricing Models

Journal of Applied Mathematics, 2012
A positivity-preserving numerical method for nonlinear Black-Scholes models is developed in this paper. The numerical method is based on a nonstandard approximation of the second partial derivative.
Shengwu Zhou, Wei Li, Yu Wei, Cui Wen
doaj   +1 more source