We study the phase diagram of the one dimensional (1D) U − V model at quarter filling in the most general case where the on-site and first-neighbour interactions U and V can be both attractive and repulsive. The results have been obtained using exact diagonalization of small clusters and variational techniques, as well as exact results in various limits. We have analyzed four properties of the ...

Two dominant negative mutants of Rab3D, N135I and T36N were recently reported to inhibit the early phase of regulated amylase secretion from mouse pancreatic acini (Chen, X., Edwards, J. A., Logsdon, C. D., Ernst, S. A., and Williams, J. A. (2002) J. Biol. Chem. 277, 18002-18009). Immunocytochemical studies showed that while the wild-type Rab3D localized to zymogen granules, the two dominant ne...

The aim of this study was to increase understanding of the mechanism and dominant drivers influencing phase separation during ram extrusion of calcium phosphate (CaP) paste for orthopaedic applications. The liquid content of extrudate was determined, and the flow of liquid and powder phases within the syringe barrel during extrusion were observed, subject to various extrusion parameters. Increa...

We report the first experimental demonstration of a slippagedominant superradiant free-electron laser (FEL) using an ultrafast seed-laser pulse. We measured the evolution of the longitudinal phase space in the slippage-dominant superradiant regime. With a roughly 1% variation in the electron beam energy, we observed a seed-like fully longitudinal coherence, and a 2% wavelength shift from the se...

Stationary phase relationships of human scalp EEGs in the frequency range of the alpha rhythm were examined by the method of cross-spectral analysis. EEGs were recorded from midsaggital points equally spaced on the scalp in normal and blind adults. Cross-spectral analysis was applied to one- or three-minute records and to successive q0-second records. The generalized component, which usually fo...

We report the first numerical demonstration of the generation of multiple superradiance pulses in a slippage-dominant freeelectron laser amplifier. In this simulation, the 1 and 2 multiple radiation-pulses are created from the deformation of the longitudinal phase space. Our simulation confirmed controllability over the temporal profile of these pulses, and paves the way for applying this techn...

In a steady-state lattice of interacting enzyme molecules that have a multicycle kinetic diagram, a cooperative or phase transition may involve not only the conventional sudden change in the relative importance of the different states of a molecule but also a sudden change in the dominant cycles of the diagram. The latter effect implies a sudden switch in the dominant biochemistry (e.g., a sudd...

Metals are ubiquitous within the earth crust. However, the exceptional high-level concentration of heavy metals in the soil due to natural or anthropogenic activities and the chemical forms in which they exist determine the level of risk they portend to the environment. This work was aimed at determining the background level of the presence of seven priority toxic metals (Cr, Ni, Pb, As, Cd, Cu...