Long-term experiments as a platform for monitoring bread wheat quality

Both winter wheat and spring wheat have the potential for producing grain of bread wheat quality under North European conditions. The two crops may due to their different growth length respond differently to previous use of green manure and to the soil organic matter content. To compare winter wheat and spring wheat for their ability to produce quality grain for bread production, both crops are included in a long-term experiment (LTE) at Askov Experimental Station. The LTE provides a unique platform for such comparison, as the two crops can be grown under identical conditions regarding previous management, soil and climate. The bread wheat experiment is part of the project AGronomical and TEChnological methods to improve ORGanic wheat quality (AGTEC-Org) funded by CORE Organic

The C*-algebra of an affine map on the 3-torus

We study the C*-algebra of an affine map on a compact abelian group and give necessary and sufficient conditions for strong transitivity when the group is a torus. The structure of the C*-algebra is completely determined for all strongly transitive affine maps on a torus of dimension one, two or three

Reducing the linewidth of an atom laser by feedback

A continuous atom laser will almost certainly have a linewidth dominated by the effect of the atomic interaction energy, which turns fluctuations in the condensate atom number into fluctuations in the condensate frequency. These correlated fluctuations mean that information about the atom number could be used to reduce the frequency fluctuations, by controlling a spatially uniform potential. We show that feedback based on a physically reasonable quantum non-demolition measurement of the atom number of the condensate in situ can reduce the linewidth enormously.Comment: 5 pages, 1 figur