Various patterns of standing waves are found beyond the onset of the short-wave instability in a model reactiondiffusion system. These include plain and modulated stripes, squares, and rhombi in systems with square and rectangular geometry and patterns with rotational symmetry in systems with circular geometry. We also find standing waves consisting of periodic time sequences of stripes and rho...

OS Circular is a framework for Internet Disk Image Distribution of software for virtual machines, those which offer a ‘‘virtualized’’ common PC environment on any PC. OS images are obtained via the stackable virtual disk ‘‘Trusted HTTP-FUSE CLOOP’’. The system is designed to utilize Mirror servers and Proxies for highly-scalable worldwide deployment. OS Circular easily and efficiently handles b...

Context. A selection of ultracool dwarfs are known to be radio active, with both gyrosynchrotron emission and the electron cyclotron maser instability being given as likely emission mechanisms. Aims. We explore whether ultracool dwarfs previously undetected at 8.5 GHz may be detectable at a lower frequency. Methods. We select a sample of fast rotating ultracool dwarfs with no detectable radio a...

where g is a rational function of two variables, which we write as a quotient of polynomials without common factor. Given starting values z0 = x and z1 = y, equation (0.1) gives rise to an infinite sequence (zn)n≥0, as long as the denominator in (0.1) does not vanish. One of the basic questions here is to find the periodic sequences generated by (0.1), i.e., sequences for which zj+p = zj for al...

Periodic elements play important roles in genomic structures and functions, yet some complex periodic elements in genomes are difficult to detect by conventional methods such as digital signal processing and statistical analysis. We propose a periodic power spectrum (PPS) method for analyzing periodicities of DNA sequences. The PPS method employs periodic nucleotide distributions of DNA sequenc...

The temporal context of an acoustic signal can greatly influence its perception. The present study investigated the neural correlates underlying perceptual facilitation by regular temporal contexts in humans. Participants listened to temporally regular (periodic) or temporally irregular (nonperiodic) sequences of tones while performing an intensity discrimination task. Participants performed si...

basically saying we care not about the rest of x[n], since it is zero. Pretend that it is periodic for analysis purpose since for the DFT it makes no difference. Defined only for 0≤ n,k ≤ N−1. The rest is zero. This means the inherent periodicity is not represented. Notation x[n] DFT ←→ X [k] Lots of properties (similar to DFS) circular convolution is important. Given x1[n] and x2[n], form x̃1[n...

2D photonic crystal which comprises a periodic array of parallel lated dielectric constants and in [16, 20] for a periodic array rods of air of a square cross section embedded in a background of parallel dielectric rods of circular cross section whose lossless medium of higher dielectric constant. The numerical analyintersections with perpendicular planes form a triangular sis of dependence of ...

In this paper we employ the periodic unfolding method for simulating the electromagnetic field in a composite material exhibiting heterogeneous microstructures which are described by spatially periodic parameters. We consider cell problems to calculate the effective parameters for a Debye dielectric medium in the cases of circular and square microstructures in two dimensions. We assume that the...