Martensen interpolation has been investigated in Dahmen et?al. (Numer Math 52:564–639, 1988), Delvos (2003), Martensen (Numer Math 21:70–80, 1973), Siewer (BIT Numer Math 46:127–140, 2006). In this paper we investigate bivariate constructions using Boolean methods (Delvos and Schempp, Boolean methods in interpolation and approximations. Pitman research notes in mathematical series. Wiley, New York, 1989). 相似文献
The kinetics of the hydroformylation of 3,3-dimethyl-1-butene with a rhodium monophosphite catalyst has been studied in detail. Time-dependent concentration profiles covering the entire olefin conversion range were derived from in situ high-pressure FTIR spectroscopic data for both, pure organic components and catalytic intermediates. These profiles fit to Michaelis-Menten-type kinetics with competitive and uncompetitive side reactions involved. The characteristics found for the influence of the hydrogen concentration verify that the pre-equilibrium towards the catalyst substrate complex is not established. It has been proven experimentally that the hydrogenolysis of the intermediate acyl complex remains rate limiting even at high conversions when the rhodium hydride is the predominant resting state and the reaction is nearly of first order with respect to the olefin. Results from in situ FTIR and high-pressure (HP) NMR spectroscopy and from DFT calculations support the coordination of only one phosphite ligand in the dominating intermediates and a preferred axial position of the phosphite in the electronically saturated, trigonal bipyramidal (tbp)-structured acyl rhodium complex. 相似文献
To investigate the temperature profiles on laser heated polymer films, we track the thermal radiation with 1 μs time and 1
μm spatial resolution. The resulting two-dimensional temperature graphs are compared to finite element simulations in order
to understand the heat conversion and flow. The temperature measurement setup consists of a NIR laser and an optical detection
system, which includes high performance optics and a microsecond gated camera, equipped with several interference filters.
In this way the thermal radiation is detected in the visible range with spectral resolution. Fitting the spectrum with Planck’s
law, two-dimensional micrographs of the temperature distribution are obtained. For polystyrene surfaces we were able to analyze
the heating and the ablation behavior. Good agreement was found between experimental results and finite element simulations,
when ablation is limited to a few tens of nanometers of the film thickness. Ablation of polystyrene starts at 150°C, 50 K
above the glass transition temperature. We suggest a photomechanical ablation mechanism at that threshold fluence. For ablation
at higher fluence and peak temperature, experiments indicate a thermal decomposition reaction. The temperature range of spinodal
decomposition is not reached and can in our case be ruled out as ablation mechanism. 相似文献
Microchimica Acta - Epitaxial (epi) stacking faults on silicon wafers with <100>- and <111>-orientation were induced by intentional contamination with substances... 相似文献
Diffusion of single molecules of a substituted terrylene diimide dye in functionalized mesoporous silica films was monitored by single‐molecule fluorescence microscopy. By varying the chemical nature and density of the functional groups, the diffusion dynamics of the dye molecules can be controlled precisely. The picture shows a sketch of a dye molecule in a pore, diffusion data for different phenyl functionalization densities, and the trajectory of one molecule in a cyanopropyl‐functionalized film.
New transitions : Low‐energy electronic transitions have been detected spectroscopically in the FeII–FeIII mixed‐valent biferrocenyl radical cation, but are absent in the spectra of the neutral analogue. They have been assigned by time‐dependent DFT calculations (squares in figure). Analogous investigations were performed for the bisfulvalenide FeII–FeIII radical cation.