Zur chemischen Untersuchung des Pfeffers

Ohne Zusammenfassung     

The hydroxyl group protonation rates of α, β and γ-cyclodextrins in dimethyl sulphoxide

The mobility $\text{k}$ of the hydroxylic protons of α, β and γ-cyclodextrins are in the order k_OH(6)>k_OH(2)>k_OH(3)′), thus revealing an instramolecular HO(2)…HO(3′) hydrogen-bond in which the OH(2) hydroxyl group is the donor.     

Line-addressable digital-deflection programmable micromirror array

We report a novel digital-deflection programmable micromirror array driven by micromechanical digital-to-analog converters that eliminates the need for electrical digital-to-analog converters for analog displacement control, thus simplifying the driving circuitry and reducing the overall system cost. Furthermore, owing to the bistable and hysteretic characteristics of parallel-plate electrostatic actuators, an array of micromirrors can be controlled by means of row- and column-addressing lines, which drastically reduce the number of routing wires and allow array sizes to increase while they maintain high array quality.     

Analytic torsion and holomorphic determinant bundles

In this paper, we prove that in the case of holomorphic locally Kähler fibrations, the analytic and algebraic geometry constructions of determinant bundles for direct images coincide. We calculate the curvature of the holomorphic Hermitian connection for the Quillen metric on the determinant bundle. We study the behavior of the Quillen metric under change of metrics in the fibers, and also on the twisting vector bundles. We thus generalize the conformal anomaly formula to Kähler manifolds of arbitrary dimension. We also study the Quillen metrics on determinants associated with exact sequences of vector bundles. We prove that the Quillen metric is smooth on the Grothendieck-Knudsen-Mumford determinant for arbitrary holomorphic fibrations.     

Étude par spectrométrie auger et par spectrométrie de masse de la chimisorption de l'oxyde de carbone sur le molybdène polycristallin

A combination of Auger spectrometry and mass spectrometry was employed to study CO chemisorption on polycrystalline Mo surfaces at room temperature. We observed five adsorption states and calculated the binding parameters (E,n₀,τ₀) for the three important states. The results obtained by the two methods are in accord but we pointed out the occurence of electronic desorption in Auger experiments. Contamination effects by C atoms in such studies were investigated by repeated cycles of adsorption-desorption and a characteristic evolution of flash desorption peaks was observed. The results are discussed in this point of view enhancing the importance of a control of the adsorption surface cleanness by a method of great sensibility like Auger spectrometry.     

La mutarotation du β-D-fructose en milieu acide dans le dimethylsulfoxyde

The proton and solvent catalyzed rate constants of furanose formation are 2 to 3-fold greater than those of pyranose formation. The activation and thermodynamic parameters are calculated.     

Rheed study of Pd particle growth on insulator substrates

Deposition of three dimensional particles on flat single crystalline surface results in appearance of transmission diffraction features. Analysis of diffraction patterns gives a possibility to characterize in situ the particle structure and orientation as well as to determine the variation of lattice parameter during particle growth. We have used the RHEED-system equipped with a data acquisition tool permitting both image processing and real time analysis. Different mode of epitaxy and lattice parameter variations were observed. The RHEED results were correlated with ex situ observations of particle size by means of Transmission Electron Microscopy (TEM).