Festigkeitslehre

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Schutz und Trocknung

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Buchbesprechungen

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Schrifttumsberichte

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Comparison of the axial resolution of practical Nipkow-disk confocal fluorescence microscopy with that of multifocal multiphoton microscopy: theory and experiment

We compare the axial sectioning capability of multifocal confocal and multifocal multiphoton microscopy in theory and in experiment, with particular emphasis on the background arising from the cross‐talk between adjacent imaging channels. We demonstrate that a time‐multiplexed non‐linear excitation microscope exhibits significantly less background and therefore a superior axial resolution as compared to a multifocal single‐photon confocal system. The background becomes irrelevant for thin (< 15 µm) and sparse fluorescent samples, in which case the confocal parallelized system exhibits similar or slightly better sectioning behaviour due to its shorter excitation wavelength. Theoretical and experimental axial responses of practically implemented microscopes are given.     

Boundary perturbation method applied to optimal plastic design of beams under bending with shear

The paper applies the boundary perturbation method (BPM) to optimal plastic design under bending with considerable shear effects. This method uses expansions of stress components and of the unknown boundary into power series of a small parameter. In the present paper the small parameter represents the effects of shear. General solutions of the hyperbolic equations derived are given and the shape is described by a power series resulting from boundary conditions. The convergence is improved by extrapolation and local corrections. Verification of the results by the ADINA program is provided. An optimal beam with a doubly-connected lateral profile is also determined. Its weight is considerably smaller than that of a solid beam.     

Über die Holztrocknung mit Großschaukeln

Zusammenfassung In Fortsetzung der in Stuttgart durchgeführten Versuche mit kleinen Schaukeln werden Untersuchungen beschrieben, die mit gro?en, in der Praxis verwendbaren Schaukeln vorgonommen wurden. Die Versuchsergebnisse lassen erkennen, wann und unter welchen Umst?nden Vorteile durch die Schaukeltrocknung zu erwarten sind.