TEMPERATURE PROFILES WITHIN A MOVING PLATE IN A COOLING FLUID USING A HEAT FLUX CLAMP ASSOCIATED TO AN INVERSE ALGORITHM

An original apparatus including two heat flux sensors installed in a clamp is developed to analyze heat transfer during the cooling of a moving plate in a water tank. Heat flux recordings are processed following an inverse methodology to determine non-symmetrical spatial temperature profile in the plate thickness. This method is non-intrusive and specially suitable for low conductivity materials like polymers.     

A Stereoselective Cathodic Coupling of Aryl Styryl Sulfones

Abstract

The cathodic coupling of unsaturated sulfones (title compounds) performed in aprotic media in the presence of lithium salts as electrolyte affords d,l dimers almost exclusively.     

Observations par microscopie électronique de traces d'ions lourds dans le triacétate de cellulose

Tracks of heavy charged particles have been observed in cellulose acetate by conventional electron microscopy (100 kV) and by high voltage microscopy (1, 2 MV). The tracks are formed of successive islets following each other at distances of 70-150 Å. With the evolution of the diameter of these zones is shown the existence of a highly perturbed cylindrical volume (diameter 400 Å for the case of krypton) corresponding to regions in which free radicals have been created. The different techniques used do not allow observation of the latent track because of the complications of energetic phenomena: the electron beam current density being limited, the contrast is small and hence the resolution is restricted.     

Vollständige Lösung der unbestimmten GleichungX 3q+Y3=1 in ganzèn Zahlen

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Über die Darstellung der Zahlen durch die binären kubischen Formen von negativer Diskriminante

Ohne Zusammenfassung     

Improved and isotropic resolution in tomographic diffractive microscopy combining sample and illumination rotation

Tomographic Diffractive Microscopy is a technique, which permits to image transparent living specimens in three dimensions without staining. It is commonly implemented in two configurations, by either rotating the sample illumination keeping the specimen fixed, or by rotating the sample using a fixed illumination. Under the first-order Born approximation, the volume of the frequency domain that can be mapped with the rotating illumination method has the shape of a “doughnut”, which exhibits a so-called “missing cone” of non-captured frequencies, responsible for the strong resolution anisotropy characteristic of transmission microscopes. When rotating the sample, the resolution is almost isotropic, but the set of captured frequencies still exhibits a missing part, the shape of which resembles that of an apple core. Furthermore, its maximal extension is reduced compared to tomography with rotating illumination. We propose various configurations for tomographic diffractive microscopy, which combine both approaches, and aim at obtaining a high and isotropic resolution. We illustrate with simulations the expected imaging performances of these configurations.