Zur Spezifit?t des Phenolreagenses

Ohne Zusammenfassung     

Mikrochemie. Technische Anwendungen

Ohne Zusammenfassung     

Zinn und Antimon in Legierungen

Ohne Zusammenfassung     

Über dynamische Beanspruchung elastischer Systeme

Ohne Zusammenfassung Vortrag, gehalten in Wien am 24. April 1928 über Einladung des Komitees zur Veranstaltung von Gastvortr?gen ausl?ndischer Gelehrter der exakten Wissenschaften.     

A New Family of Cyclic Difference Sets with Singer Parameters in Characteristic Three

We construct a new family of cyclic difference sets with parameters ((3 ^d – 1)/2, (3 ^{d – 1} – 1)/2, (3 ^{d – 2} – 1)/2) for each odd d. The difference sets are constructed with certain maps that form Jacobi sums. These new difference sets are similar to Maschietti's hyperoval difference sets, of the Segre type, in characteristic two. We conclude by calculating the 3-ranks of the new difference sets.     

Commutators, C0-semigroups and resolvent estimates

We study the existence and the continuity properties of the boundary values on the real axis of the resolvent of a self-adjoint operator H in the framework of the conjugate operator method initiated by Mourre. We allow the conjugate operator A to be the generator of a C₀-semigroup (finer estimates require A to be maximal symmetric) and we consider situations where the first commutator [H,iA] is not comparable to H. The applications include the spectral theory of zero mass quantum field models.