8 research outputs found
On supersymmetric quantum mechanics
This paper constitutes a review on N=2 fractional supersymmetric Quantum
Mechanics of order k. The presentation is based on the introduction of a
generalized Weyl-Heisenberg algebra W_k. It is shown how a general Hamiltonian
can be associated with the algebra W_k. This general Hamiltonian covers various
supersymmetrical versions of dynamical systems (Morse system, Poschl-Teller
system, fractional supersymmetric oscillator of order k, etc.). The case of
ordinary supersymmetric Quantum Mechanics corresponds to k=2. A connection
between fractional supersymmetric Quantum Mechanics and ordinary supersymmetric
Quantum Mechanics is briefly described. A realization of the algebra W_k, of
the N=2 supercharges and of the corresponding Hamiltonian is given in terms of
deformed-bosons and k-fermions as well as in terms of differential operators.Comment: Review paper (31 pages) to be published in: Fundamental World of
Quantum Chemistry, A Tribute to the Memory of Per-Olov Lowdin, Volume 3, E.
Brandas and E.S. Kryachko (Eds.), Springer-Verlag, Berlin, 200
Pulsed current electrodeposition of Zn-Ag2S/TiO2 nanocomposite films as potential photoelectrodes
Nanocomposite Zn-Ag2S/TiO2 and Zn-TiO2 films were prepared by pulsed current electrolysis from acidic zinc sulphate solutions on a titanium substrate. The influence of the nanoparticles' nature on the structural and morphological characteristics of the metallic electrodeposit was also investigated. The electrodeposits were characterized by X-ray diffraction and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. Using transmission electron microscopy, it was possible to conclude that the chemical treatment applied to the commercial TiO2 particles promotes the formation of Ag2S/TiO2 composite nanoparticles, with Ti, Ag, S and O in its composition. This was also was confirmed by X-ray fluorescence spectrometry. These particles absorb visible light radiation which makes them promising materials for photoelectrocatalytic processes. Moreover, the modification in nanoparticle composition plays a remarkable influence on the coating morphology and Zn crystallite size. When TiO2 is added, a change of Zn texture was observed along with a decrease in crystallite size. In contrast, the metal matrix nanocomposites prepared with Ag2S/TiO2 exhibit a spongy Zn morphology with a lower average Zn crystallite size. The nanocomposite films were tested in the photoelectrodegradation of ibuprofen and the best results were obtained for Zn-Ag2S/ TiO2 photoelectrodes
Remote Antarctic feeding ground important for east Australian humpback whales
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