Brody's growth curve, a three-parameter function, and Richards' function, a four-parameter function, were fit to data from 233 inbred and linecross cows to study the genetic and environmental aspects of the growth curve parameters and to compare the two functions. Fitting Brody's curve was faster and less costly to compute than Richards' function, but Richards' function had smaller sums of squa...

ON EFFICIENT ESTIMATION FOR THE LOG-NORMAL MODEL MEAN Winston A. Richards, Department of Mathematics and Statistics The Pennsylvania State University, Harrisburg, USA *Ashok Sahai, Robin Antoine, Letetia Addison, Department of Mathematics & Computer Science; Faculty of Science & Agriculture St. Augustine Campus; The University of The West Indies. Trinidad & Tobago; West Indies. And M. Raghunadh...

Pseudoparabolic equations in periodic media are homogenized to obtain upscaled limits by asymptotic expansions and two-scale convergence. The limit is characterized and convergence is established in various linear cases for both the classical binary medium model and the highly heterogeneous case. The limit of vanishing time-delay parameter in either medium is included. The double-porosity limit...

Growth rate coefficients for dark- and light-phase western grebes (Aechmophorus occidentalis) are compared with the Richards' growth model. The statistical assumptions necessary to estimate and test parameters are carefully scrutinized. Autocorrelations of the residuals are removed with an autoregressive model, and heterogeneity of variance of the residuals is corrected with weighted least squa...

We present a network formulation for traffic flow model with nonlocal velocity in the flux function. The modeling framework includes suitable coupling conditions at intersections to either ensure maximum or distribution parameters. Based on an upwind type numerical scheme, we prove principle and existence of weak solutions networks. also investigate limiting behavior proposed models when influe...

This study introduces a model based on Richards’ equation to describe variably-saturated beach groundwater flow. The surface wave propagation is computed by the phase-resolving non-hydrostatic SWASH code. data are used make suitable dynamic boundary condition at face force equation. latter solved weighted discontinuous Galerkin method together with adaptive mesh refinement. validated comparison...