Unified (q;α,β,γ;ν)(q;\alpha,\beta,\gamma;\nu)-deformation of one-parametric q-deformed oscillator algebras

We define a generalized $(q;\alpha,\beta,\gamma;\nu)$-deformed oscillator algebra and study the number of its characteristics. We describe the structure function of deformation, analyze the classification of irreducible representations and discuss the asymptotic spectrum behaviour of the Hamiltonian. For a special choice of the deformation parameters we construct the deformed oscillator with discrete spectrum of its "quantized coordinate" operator. We establish its connection with the (generalized) discrete Hermite I polynomials

ICAR: endoscopic skull‐base surgery

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Study of surface acidity of oxide catalysts by photoacoustic spectroscopy

Photoacoustic spectroscopy has been employed to estimate quantitatively the acid sites on oxide catalysts. The technique involves the measurement of the ratio of intensities of absorption bands due to conjugate bases and acids of indicators adsorbed on the catalyst surface as a function of the amount of added n-butylamine. Basic sites in sodium-impregnated alumina samples have been examined by adsorbing phenolphthalein on these surfaces

Bonding of Carbon Monoxide to Metals as Revealed by Electron Energy Loss Spectroscopy

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Study of adsorbed molecules by electron energy loss spectroscopy

Electron energy loss spectroscopy (EELS) has become a very important tool in the study of the surface chemistry of solids. Besides providing information on the vibrational spectra of adsorbed molecules, EELS (with primary electrons of low energy, ≤5 eV) also throws light on metal-ligand vibrations. The vibrational spectra from EELS are useful in understanding gas-solid interactions and the nature of the molecular species such as the state of hybridization of orbitals in hydrocarbon fragments bound to the surface. By employing primary electrons of higher energies (30-300 eV), electronic excitations of adsorbed molecules as well as the adsorbents themselves can be fruitfully studied. This article describes the up-to-date status of EELS in the study of adsorbed molecules and surveys all the important literature data and correlations

Study of solids and surfaces by photoacoustic spectroscopy

Photoacoustic spectroscopy has been employed to study the electronic spectra of a variety of solids. The systems studied include powders of intensely coloured dyes, amorphous chalcogenides and oxide gels besides polycrystalline samples of several oxide materials. Surface sensitivity of the technique has been examined by study of dye adsorption on oxide surfaces and determination of surface areas of active oxides. Acidic and basic sites on catalyst surfaces have also been estimated by this technique