Application of the theory of generalized rays to diffractions of transient waves by a cylinder

The theory of generalized rays was developed to analyze transient waves in layered media where incident circular or spherical waves are reflected and refracted by plane boundaries. The theory has been recently extended to analyze the diffraction of transient waves by a spherical or a cylindrical boundary. In this paper, the generalized ray integrals, which represent the fourier transformed diffracted waves, are formulated for the diffraction of an incident spherical pulse by a circular cylinder. The ray integral involves a double integration with respect to two variables of wave slowness. Through a simultaneous transformation of variables, the inverse Fourier transform of these double integrals are completed by applying the Cagniard method.     

Neue Reagentien zum papierchromatographischen Nachweis von Aminosäuren, 5. Mitt.: Reaktionen des 1,2,3-Trioxo-2,3-dihydrophenalens mit primären Aminoverbindungen

Zusammenfassung Es ist gelungen, mit dem, dem Ninhydrin analog gebauten 1,2,3-Trioxo-2,3-dihydrophenalen (1), den Mechanismus der Ninhydrinreaktion aufzuklären.

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New reagents for the detection of amino acids by paper chromatography, V.: Reaction of 1.2.3-trioxo-2.3-dihydrophenalene with primary amines

The mechanism of the ninhydrin reaction has been established using 1.2.3-trioxo-2.3-dihydro-phenalen (1) as a model compound.