Unconventional superconductivity and other previously unknown phases of matter exist in the vicinity of a quantum critical point (QCP): a continuous phase change of matter at absolute zero. Intensive theoretical and experimental investigations on itinerant systems have shown that metallic ferromagnets tend to develop via either a first-order phase transition or through the formation of intermed...

The analytical zero-temperature phase diagram of the double exchange model for classical background spins as a function of the carrier density and Hund’s coupling in the entire range of these parameters is presented. By constructing a continuum field theory we explore the possibility of a continuous phase transition from ferromagnetic state to a gently varying textured state. We find such a tra...

We consider a modification of the contact process incorporating higher-order reaction terms. The original contact process exhibits a non-equilibrium phase transition belonging to the universality class of directed percolation. The incorporated higher-order reaction terms lead to a non-trivial phase diagram. In particular, a line of continuous phase transitions is separated by a tricritical poin...

BACKGROUND: Lovastatin is known to inhibit its own synthesis in the fungus Aspergillus terreus. Therefore, the use of a fermentation strategy that continuously removes some of the lovastatin produced from the bioreactor can enhance its productivity. This paper reports on the effects of dilution rate and the composition of the feed medium on lovastatin production by A. terreus. RESULTS: The feed...

In order to further improve bandwidth efficiency, some of the mobile radio systems use special kind of frequency modulation schemes called continuous phase modulation-CPM. The schemes are particularly attractive because they have constant envelope and excellent spectral characteristics resulting from phase changes in a continuous manner. The complex envelope of any CPM signal can be represented...

A quantum system can undergo a continuous phase transition at the absolute zero of temperature as some parameter entering its Hamiltonian is varied. These transitions are particularly interesting for, in contrast to their classical finite temperature counterparts, their dynamic and static critical behaviors are intimately intertwined. We show that considerable insight is gained by considering t...

| In this paper, the problem of signal design for continuous phase modulation is examined. Using the performance measures of e ective bandwidth and minimum distance, \optimal" signal shapes are calculated for various receiver observation intervals for full and partial response signalling. For the partial response case, the optimization could only be done for a receiver observation interval of o...

Products between phase-type distributed random variables and any independent, positive continuous variable are studied. Their asymptotic properties established, an expectation-maximization algorithm for their effective statistical inference is derived implemented using real-world datasets. In contrast to discrete scaling studied in earlier literature, the present case closed-form formulas vario...