Nachweis von p-Phenylendiamin in Haarf?rbemitteln

Ohne Zusammenfassung     

Bestimmung des Magnesiumchlorids im Wasser

Ohne Zusammenfassung     

Naturkonstanten

Ohne Zusammenfassung     

Den Gebrauch ganzzahliger Atomgewichte

Ohne Zusammenfassung     

Direct study of the lifetime and acceleration of a coloured nucleon

We propose a method of studying directly the confinement part of the force due to the coloured field, and the time that a coloured hadron remains coloured. Applying the method topp→pX data we find that the mean time for colour neutralization of a coloured nucleon is 1.2±0.1 fm/c or (3.9±0.3)×10^?24 s.     

Verification of a model to predict the influence of particle inertia and gravity on a decaying turbulent particle-laden flow

In an earlier publication some of the authors presented a theoretical model for the calculation of the influence of particle inertia and gravity on the turbulence in a stationary particle-laden flow. In the present publication the model is extended for application to a decaying suspension. Also a comparison is given between predictions made with the model and experimental data (own data and data reported in the literature) on a decaying turbulent flow with particles in a water tunnel or in a wind tunnel. For most of the experiments a prediction with reasonable accuracy and an interpretation is possible by means of the model.     

Frequency tripling for resonance ionization spectroscopy (RIS) of Cd

1 =228.8 nm). Laser light with an average power of 2 mW was obtained after frequency tripling and was successfully used for RIS test measurements on cadmium with a time-of-flight mass spectrometer. The eight stable Cd isotopes could be identified unambiguously. Received: 6 October 1997     

Modular Lie powers and the Solomon descent algebra

Let V be an r-dimensional vector space over an infinite field F of prime characteristic p, and let L_n(V) denote the nth homogeneous component of the free Lie algebra on V. We study the structure of L_n(V) as a module for the general linear group GL_r(F) when n=pk and k is not divisible by p and where r≥n. Our main result is an explicit 1-1 correspondence, multiplicity-preserving, between the indecomposable direct summands of L_k(V) and the indecomposable direct summands of L_n(V) which are not isomorphic to direct summands of V^⊗n. Our approach uses idempotents of the Solomon descent algebras, and in addition a correspondence theorem for permutation modules of symmetric groups. Second author supported by Deutsche Forschungsgemeinschaft (DFG-Scho 799).