The average wavelet coefficient method is applied to investigate the scaling features of heart rate variability during meditation, a state of induced mental relaxation. While periodicity dominates the behavior of the heart rate time series at short intervals, the meditation induced correlations in the signal become significantly weaker at longer time scales. Further study of these correlations ...

We discuss the stability of galactic disks in which the energy of interstellar clouds is gained in encounters with expanding supernova remnants and lost in inelastic collisions. Energy gain and loss processes introduce a phase difference between the pressure and density perturbations, making disks unstable on small scales for several recipes of star formation. This is in contrast to the standar...

The present study examined the differential predictive accuracy of seven Minnesota Multiphasic Personality Inventory alcoholism scales and two drug abuse scales across both sex and race in a sample of 171 alcoholic inpatients. Results demonstrated considerable variance among these scales in their ability to predict alcohol and other drug use, expectancies, and consequences. The predictive accur...

In web-based adaptive systems, the same rating scales are usually provided to all users for expressing their preferences with respect to various items. It emerged from a user experiment that we recently carried out that different users show different preferences with respect to the rating scales to use in the interface of adaptive systems, given the particular topic they are evaluating. Startin...

To dimension network links, such that they will not become QoS bottlenecks, the peak rate on these links should be known. To measure these peaks on sufficiently small time scales, special measurement tools are needed. Such tools can be quite expensive and complex. Therefore network operators often rely on more cheap, standard tools, like MRTG, which were designed to measure average traffic rate...

The 2-point angular correlation function of galaxies, ω(θ) , has been computed on equatorial fields observed with the CTIO 4m prime focus, within a total area of 2.31 deg. In the magnitude range 19 ≤ mR ≤ 21.5, corresponding to < z >≈ 0.35, we find an excess of power in ω(θ) at scales 2 ≤ θ ≤ 6 over what would be expected from an extrapolation of ω(θ) measured at larger θ. The significance of t...

The present investigation concerns the development of advanced scalar turbulence modeling approaches and their application to the calculation of non-isothermal wall-bounded flow phenomena. A new scalar modeling technique based on scalar turbulent scales is proposed and implemented at a second-order modeling approach. Instead of the classical analogy concept between the mechanical and the scalar...

The evolution of baryon density perturbations on very small scales is investigated. In particular, the nonlinear growth induced by the radiation drag force from the shear velocity field on larger scales during the recombination epoch, which is originally proposed by Shaviv in 1998, is studied in detail. It is found that inclusion of the diffusion term which Shaviv neglected in his analysis resu...

From a hopping rate equation for disordered materials we derive a macroscopic drift{di usion equation. For this purposes two space{time scales are simultaneously considered. The microscopic dynamics is characterized by the distribution of localized states and the hopping rate. On the macroscopic space scale both the hopping rate and the disordered material are allowed to be inhomogeneous.

It has been known for some time that proportional output feedback will stabilize certain classes of linear time-invariant systems under an adaptation mechanism that drives the feedback gain sufficiently high. More recently, it was demonstrated that discrete implementations of the high-gain adaptive controller also require adaptation of the sampling rate. In this paper, we use recent advances in...