Untersuchung von Hopfen

Ohne Zusammenfassung     

Concerning the general equations of the seventh and eighth degrees

Mathematische Annalen -     

Comparison of nuclear Bragg scattering with Mössbauer spectroscopy for the measurement of hyperfine interactions

Fourier analysis of the time evolution of the nuclear Bragg scattering from the (7, 7, 7) reflection in α-hematite (⁵⁷Fe) excited by synchrotron radiation was used to extract values of Zeeman splitting of the ground and 14.413-keV states of⁵⁷Fe in the crystal magnetic field. The results so obtained apparently do not agree with the corresponding values obtained from Mössbauer spectroscopy on α-hematite. Possible reasons for the discrepancy are discussed.     

Neutron scattering study of NH4+ Motion in NH4+ β-alumina

Incoherent inelastic neutron scattering has been used to study the motion of NH₄⁺ ions in NH₄⁺ β-alumina. The results establish that jump reorientation of NH₄⁺ ions is rapid compared to translational diffusion: The data are consistent with thermally activated jumps between equivalent NH₄⁺ orientations with a proton jump frequency of $\text{~1.0 × 10}{}^{12}\text{sec}$ at room temperature.The data are inconsistent with either free rotation or unrestricted rotational diffusion. The residence time between translational diffusion jumps is >6 × 10^?11 sec at temperatures less than 473°K.     

Periodic Plane Waves for the Oregonator

The Oregonator is a set of differential equations proposed by R. J. Field and R. M. Noyes as a model for the oscillating chemical reaction first studied by B. P. Belousov and A. M. Zhabotinskii. In this paper it is shown that the associated diffusion equations have periodic plane waves for parameter values not covered in earlier work. This amounts to studying a singularly perturbed system when nothing is known about the stability of periodic solutions for the reduced system.     

On Resource Allocation in Project Networks

The problem of scheduling activities so as to minimize project duration in the presence of resource constraints is considered. A branch and bound algorithm is described and some limited computational experience is reported.