We present analyses of variability in the red giant stars in the metal-poor globular cluster NGC6397, based on data obtained with the Hubble Space Telescope. We use an non-standard data reduction approach to turn a 23-day observing run originally aimed at imaging the white dwarf population, into time-series photometry of the cluster’s highly saturated red giant stars. With this technique we obt...

Spatial oscillations in soil contaminant concentration profiles are sometimes observed, but rarely commented on, or are attributed to noisy data. In this paper we consider a possible mechanism for the occurrence of oscillatory reactant profiles within contaminant plumes. The bioremediative reactions which occur are effected by bacteria, whose rôle is normally conceived of as being passive. Here...

Nested oscillations, where the phase of the underlying slow rhythm modulates the power of faster oscillations, have recently attracted considerable research attention as the increased phase-coupling of cross-frequency oscillations has been shown to relate to memory processes. Here we investigate the hypothesis that reactivations of memory patterns, induced by either external stimuli or internal...

The characterization of functional network structures among multiple neurons is essential to understanding neural information processing. Information geometry (IG), a theory developed for investigating a space of probability distributions has recently been applied to spike-train analysis and has provided robust estimations of neural interactions. Although neural firing in the equilibrium state ...

It is becoming increasingly apparent that brain oscillations in various frequency bands play important roles in perceptual and attentional processes. Understandably, most of the associated experimental evidence comes from human or animal electrophysiological studies, allowing direct access to the oscillatory activities. However, such periodicities in perception and attention should, in theory, ...

For a long time alpha oscillations have been functionally linked to the processing of visual information. Here we propose an new theory about the functional meaning of alpha. The central idea is that synchronized alpha reflects a basic processing mode that controls access to information stored in a complex long-term memory system, which we term knowledge system in order to emphasize that it com...

A common finding across many reaction time tasks is that people slow down on trials following errors, a phenomenon known as post-error slowing. In the present study, we tested a novel hypothesis about the neural mechanism underlying post-error slowing. Recent research has shown that when task-relevant stimuli occur in a rhythmic stream, neuronal oscillations entrain to the task structure, there...

In this paper we present an attempt to detect Doppler effect on Jupiter during the impact of the fragment A of the comet, Shoemaker-Levy 9. We give a short description of the technique used to observe the impact, then present the observations and finally a theoretical analysis and interpretation. The instrumentation used is an advanced and more sensitive version of the Magneto-Optical Filter (n...

Neutrinos are a type of fundamental particles, like electrons and quarks. They have no electric charge and they come in three types (flavors), namely the electron neutrino (νe), the muon neutrino (νμ) and the tau neutrino (ντ). They are produced in various places such as in the Earth’s atmosphere and in the center of the Sun. The interactions of neutrinos with matter are so weak that they easil...

The present data of gallium experiments provide indirectly the experimental limit on the fraction of ν 2 mass eigenstate for the 8 B neutrinos from the Sun. However, if to use the experimental data alone, the fraction of ν 2 and, consequently, sin 2 θ 12 still is allowed to be varied within a rather broad range. The further experimental efforts are needed to clear this point. Introduction. The ...