OBJECTIVE This study aimed to explore methods of assessing interactions between neuronal sources using MEG beamformers. However, beamformer methodology is based on the assumption of no linear long-term source interdependencies [VanVeen BD, vanDrongelen W, Yuchtman M, Suzuki A. Localization of brain electrical activity via linearly constrained minimum variance spatial filtering. IEEE Trans Biome...

Time-course gene expression profiles associated with periodic biological processes should appear periodic. However, because of inherit problems with the experimental protocols measured gene expression data are actually pseudo-periodic, not exactly periodic. Therefore, identifying pseudo-periodically expressed gene from their time-course data could help understand the molecular mechanism of peri...

Abstract In an effort to aid in the understanding of the nonlinear dynamics of the trajectories followed by an Atomic Force Microscope (AFM), I have written an interactive java applet simulator using a simple inelastic billiard model developed by Cvitanović and Paškauskas. We study the trajectories followed by the tip of the AFM as a function of its physical parameters and initial conditions. T...

We report three RXTEyPCA observations of the low-mass X-ray binary 4U 0614109. They show strong (130% rms) band-limited noise with a cutoff frequency varying between 0.7 and 15 Hz in correlation with the X-ray flux, fX. We observe two nonsimultaneous 11%–15% (rms) kHz peaks near 728 and 629 Hz in the power spectra of two of our observations when fX 1 10 ergs cm s (2–10 keV) but find no quasi-pe...

A theoretical study of the multi-coupling flexural and longitudinal waves that propagate in a periodic dual-beam-type waveguide with structural connection branches is conducted. The analytical equations of the transfer matrix method are derived for the wave transmission with consideration given to the fully flexural and longitudinal motions that are tri-coupled at each connection. Based on this...

In this paper, we investigate the long-term behaviour of solutions of the periodic Sigmoid Beverton-Holt equation [Formula: see text] where the a ( n ) and δ( n ) are p-periodic positive sequences. Under certain conditions, there are shown to exist an asymptotically stable p-periodic state and a p-periodic Allee state with the property that populations smaller than the Allee state are drive...

Non-homogenous Poisson processes with periodic claim intensity rate are proposed as the claim counting process of risk theory. We introduce a doubly periodic Poisson model with short and long term trends, illustrated by a double-beta intensity function. Here periodicity does not repeat the exact same short term pattern every year, but lets its peak intensity vary over a longer period. This mode...

During long-term observations of the Galactic Centre region in hard X-rays (10-300 keV) in space experiments made on board Prognoz-9 satellite and ”Mir” orbital station (GRIF experiment) some periodic sources were revealed. They include periodicities of hour and day range of period: 152 h, 98 h, 82 h (4U170037), 69 h, 62 h, 13.3 h, 9.36 h, 8.03h, 8.15 h (Cen X-4), 4.38 h, 4.35 h (4U1755-33) and...

In this paper we examine the influence of periodic islands within a time periodic chaotic flow on the evolution of a scalar tracer. The passive scalar tracer is injected into the flow field by means of a steady source term. We examine the distribution of the tracer once a periodic state is reached, in which the rate of injected scalar balances advection and the molecular diffusion κ. We study t...