Klauder's coherent states for the radial Coulomb problem in a uniformly curved space and their flat-space limits

First a set of coherent states a la Klauder is formally constructed for the Coulomb problem in a curved space of constant curvature. Then the flat-space limit is taken to reduce the set for the radial Coulomb problem to a set of hydrogen atom coherent states corresponding to both the discrete and the continuous portions of the spectrum for a fixed \ell sector.Comment: 10 pages, no figure

Delocalization and the semiclassical description of molecular rotation

We discuss phase-space delocalization for the rigid rotator within a semiclassical context by recourse to the Husimi distributions of both the linear and the $3D-$anisotropic instances. Our treatment is based upon the concomitant Fisher information measures. The pertinent Wehrl entropy is also investigated in the linear case.Comment: 6 pages, 3 figure

Coherent states for polynomial su(1,1) algebra and a conditionally solvable system

In a previous paper [{\it J. Phys. A: Math. Theor.} {\bf 40} (2007) 11105], we constructed a class of coherent states for a polynomially deformed $su(2)$ algebra. In this paper, we first prepare the discrete representations of the nonlinearly deformed $su(1,1)$ algebra. Then we extend the previous procedure to construct a discrete class of coherent states for a polynomial su(1,1) algebra which contains the Barut-Girardello set and the Perelomov set of the SU(1,1) coherent states as special cases. We also construct coherent states for the cubic algebra related to the conditionally solvable radial oscillator problem.Comment: 2 figure

P1 receptors and cytokine secretion

Evidence has accumulated in the last three decades to suggest tissue protection and regeneration by adenosine in multiple different cell types. Adenosine produced in hypoxic or inflamed environments reduces tissue injury and promotes repair by receptor-mediated mechanisms. Among other actions, regulation of cytokine production and secretion by immune cells, astrocytes and microglia (the brain immunocytes) has emerged as a main mechanism at the basis of adenosine effects in diseases characterized by a marked inflammatory component. Many recent studies have highlighted that signalling through A1 and A2A adenosine receptors can powerfully prevent the release of pro-inflammatory cytokines, thus inhibiting inflammation and reperfusion injury. However, the activation of adenosine receptors is not invariably protective of tissues, as signalling through the A2B adenosine receptor has been linked to pro-inflammatory actions which are, at least in part, mediated by increased release of pro-inflammatory cytokines from epithelial cells, astrocytes and fibroblasts. Here, we discuss the multiple actions of P1 receptors on cytokine secretion, by analyzing, in particular, the role of the various adenosine receptor subtypes, the complex reciprocal interplay between the adenosine and the cytokine systems, their pathophysiological significance and the potential of adenosine receptor ligands as new anti-inflammatory agents

Hybrid Wiener spectrogram filtering of noisy speech with postprocessing

94 p.Digital noise reduction processing is used in many telecommunication applications to enhance the quality of speech. This thesis focuses on the problem of single microphone frequency domain speech enhancement in noisy environments. The main characteristics of available frequency domain noise reduction algorithms are firstly presented. In this thesis, among the available single microphone speech enhancement techniques the hybrid Wiener filter and generalized spectral subtraction methods are presented. A new method, hybrid Wiener spectrogram filtering, which effectively reduces the additive background noise level, is proposed. Objective measures and examination of spectrogram plots showed that the proposed method outperformed the generalized spectral subtraction technique resulting in better speech quality and reduced levels of musical noise. Further enhancements in speech quality were achieved by applying time frequency filtering that was designed to minimize residual noise.Master of Science (Signal Processing

Les relations anglo-birmanes de 1753 à 1762

During the second half of the 18th century, Burma, in spite of the quality of her teckwood and her sealing wax, was considered by the English East Indies Company only as a market of minor importance. If in 1753 the English authorities determined to settle down in the Negrais Island, it is chiefly to prevent the French from occupying the place. Burmese and Mon chiefs received English merchants suspiciously and wished principally to obtain weapons. The officers of the Company helped both sides as opportunities arose. Such an attitude led to the slaughter of people living in the Negrais godown and stopped political relations between the Company and the Burmese kingdom.Dans la seconde moitié du XVIIIe siècle, la Birmanie, malgré la qualité de son bois de teck et de sa cire, ne représente pour la Compagnie anglaise des Indes qu'un marché secondaire. Si, en 1753, les Anglais décident de s'installer dans l'île de Negrais, c'est surtout pour empêcher les Français de l'occuper. Birmans et Môns, qui se font la guerre, les accueillent avec méfiance et cherchent surtout à acquérir des armes. Les agents de la Compagnie n'ont pas de politique commune et aident les deux camps selon les occasions. Ce qui conduit au massacre des occupants du comptoir de Negrais et à la mise en sommeil des relations politiques entre la Compagnie et le royaume.Thaik Maung Maung. Les relations anglo-birmanes de 1753 à 1762. In: Revue française d'histoire d'outre-mer, tome 72, n°267, 2e trimestre 1985. La péninsule indochinoise et les Européens de la seconde moitié du XVIIIe siècle à 1954 (1re Partie) pp. 137-154