Continuous tone images must be halftoned to be displayed on binary output devices such as printers. The ordered dither algorithm is a popular approach to halftoning. This algorithm uses a threshold matrix to approximate gray scale values. The arrangement of thresholds in the matrix determines texture artifacts introduced into the halftoned image. Thus, the challenge of research in ordered dithe...

This paper proposes an approach to speed up seismic forward modeling when the Green’s function of a given model is structured in the sense that the Green’s function has a sparse representation in some known transform domain. The first step of our approach runs a forward finite-difference (FD) simulation for a duration longer than each conventional run, but with all sources activated simultaneou...

In this paper, a time-space fractional diffusion equation in two dimensions (TSFDE2D) with homogeneous Dirichlet boundary conditions is considered. The TSFDE-2D is obtained from the standard diffusion equation by replacing the first-order time derivative with the Caputo fractional derivative tD γ ∗ , γ ∈ (0, 1), and the second order space derivatives with the fractional Laplacian −(−∆)α/2, α ∈ ...

Microelectrode studies in nonhuman primates and other mammals have demonstrated that many neurons in auditory cortex are excited by pure tone stimulation only when the tone's frequency lies within a narrow range of the audible spectrum. However, the effects of auditory cortex lesions in animals and humans have been interpreted as evidence against the notion that neuronal frequency selectivity i...

In this paper we consider the matrix lattice equation Un,t(Un+1−Un−1)=g(n)I, in both its autonomous (g(n)=2) and nonautonomous (g(n)=2n−1) forms. We show that each of these two equations are integrable. addition, explore construction Miura maps which relate equations, via intermediate to analogs Volterra but dependent variables. For last systems, cases where variables belong certain special cla...

The prevalence of cardiovascular disease is lower in middle-aged and older women than men. Increased endothelin-1-mediated vasoconstriction has been linked to the etiology of a number of cardiovascular diseases, including atherosclerosis, heart failure, and hypertension. It is unknown whether a sex difference in endothelin-1-mediated vasoconstrictor tone exists in middle-aged and older adults. ...