Evaporative depolarization and spin transport in a unitary trapped Fermi gas

We consider a partially spin-polarized atomic Fermi gas in a high-aspect-ratio trap, with a flux of predominantly spin-up atoms exiting the center of the trap. We argue that such a scenario can be produced by evaporative cooling, and we find that it can result in a substantially non-equilibrium polarization pattern for typical experimental parameters. We offer this as a possible explanation for the quantitative discrepancies in recent experiments on spin-imbalanced unitary Fermi gases.Comment: 6 pages, 3 figures; published versio

Trimers, molecules and polarons in imbalanced atomic Fermi gases

We consider the ground state of a single "spin-down" impurity atom interacting attractively with a "spin-up" atomic Fermi gas. By constructing variational wave functions for polarons, molecules and trimers, we perform a detailed study of the transitions between each of these dressed bound states as a function of mass ratio $r=m_\uparrow/m_\downarrow$ and interaction strength. We find that the presence of a Fermi sea enhances the stability of the $p$-wave trimer, which can be viewed as a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) molecule that has bound an additional majority atom. For sufficiently large $r$, we find that the transitions lie outside the region of phase separation in imbalanced Fermi gases and should thus be observable in experiment, unlike the well-studied equal-mass case.Comment: 5 pages, 2 figure

Wheat quality in W.A

Three separate quality classes or categories of wheat are now received by C.B.H. These are a soft biscuit wheat, a hard bread wheat and a mixed grain suitable as a filler wheat in bread-making and for making noodles. In this article the basis of quality differences between these classes of wheat is described and some of the terms and concepts used in distinguishing between cultivars (varieties) and classes of wheat are discussed

Hints on sampling premium wheat crops

EACH year much of the premium wheat received by millers is inferior in quality to the samples on which the premium bids are based. This often leads to reduction in the premium paid. Cereal Products Adviser J. Parish, B.Sc. (Agric), describes how samples can overestimate the quality of a crop and suggests methods of taking samples which will give a true estimate of crop quality

Wheat quality surveys in Western Australia. 2. Variation between seasons and localities in the production of high and low protein wheat

Although the protein content of West Australian f.a.q. wheat averages only 9.4 per cent., often substantial amounts of comparatively high protein wheat are contained in this mixture. However the quantity varies widely from year to year and is obtained from widely scattered areas of the wheatbelt

Schools + Politics + Money = Turmoil, Change, Uncertainty

A book review of The Changing Politics of School Finance, edited by Nelda Cambron-McCabe and Allan Odden

A Genetic Algorithm Approach to Automating Satellite Range Scheduling

Satellite range scheduling involves scheduling satellite supports in which a satellite and a specific remote tracking station communicate with each other within a specified time window. As the number of satellite supports continue to increase, more pressure is placed on the current manual system to generate schedules efficiently. Previous research efforts focused on heuristic and mixed-integer programming approaches which may not produce the best results. The objective of this research was to determine if a genetic algorithm approach to automating the generation of 24 hour schedules was competitive with other methods. The goal was to schedule as many supports as possible without conflict. The genetic algorithm approach attempted to find the best priority ordering of support requests, and then used a schedule builder program to build schedules based on simple rules. A schedule was produced for seven days of representative satellite range data with slightly better results compared to earlier results using a mixed-integer programming formulation. Based on the reported results, the genetic algorithm approach presented in this research appears to be a competitive approach for generating 24-hour satellite range schedules

Wheat quality surveys in Western Australia. Part 1. The distribution of areas producing high and low protein wheat

THIS article reports results from survey work carried out by the author, in collaboration with Co-operative Bulk Handling Ltd., on wheat drawn from all receival points in Western Australia during the period 1956-63

Growing barley for grain in Western Australia : barley quality

Plumpness and absence of pinched grain are desirable for both malting and feed barley. This is a brief discussion of various Quality standards in barley and how they may not be met