Properties of quasi two-dimensional condensates in highly anisotropic traps

We theoretically investigate some of the observable properties of quasi two-dimensional condensates. Using a variational model based on a Gaussian-parabolic trial wavefunction we calculate chemical potential, condensate size in time-of-flight, release energy and collective excitation spectrum for varying trap geometries and atom numbers and find good agreement with recent published experimental results.Comment: 7 pages, 4 figure

Experimental observation of the 'Tilting Mode' of an array of vortices in a dilute Bose-Einstein Condensate

We have measured the precession frequency of a vortex lattice in a Bose-Einstein condensate of 87Rb atoms. The observed mode corresponds to a collective motion in which all the vortices in the array are tilted by a small angle with respect to the z-axis (the symmetry axis of the trapping potential) and synchronously rotate about this axis. This motion corresponds to excitation of a Kelvin wave along the core of each vortex and we have verified that it has the handedness expected for such helical waves, i.e. precession in the opposite sense to the rotational flow around the vortices. The experimental method used to excite this collective mode closely resembles that used to study the scissors mode and excitation of the scissors mode for a condensate containing a vortex array was used to determine the angular momentum of the system. Indeed, the collective tilting of the array that we have observed has previously been referred to as an `anomalous' scissors mode.Comment: 5 pages, 7 figures to be published in PR

Alfalfa Varieties for South Dakota

Alfalfa varieties for South Dakota discusses varietal selection, persistence, winter hardiness, drought tolerance, disease and insect resistance, and use of alfalfa. Also included are definitions of terminology related to alfalfa crops

Alfalfa Varieties for South Dakota

Alfalfa varieties for South Dakota discusses varietal selection, persistence, winter hardiness, drought tolerance, disease and insect resistance, and use of alfalfa. Also included are definitions of terminology related to alfalfa crops

Alfalfa Management on Dryland

Alfalfa management on dryland discusses alfalfa-grass mixtures, stand establishment, harvesting and grazing management, fertilization, insect, weed, and disease control, and using alfalfa as a soil-building crop

Alfalfa Varieties for South Dakota

Alfalfa varieties for South Dakota discusses varietal selection, persistence, winter hardiness, drought tolerance, disease and insect resistance, and use of alfalfa. Also included are definitions of terminology related to alfalfa crops

Alfalfa Management

Guide to alfalfa management discusses alfalfa-grass mixtures, stand establishment, harvesting and grazing management, fertilization, insect, weed, and disease control, and using alfalfa as a soil-building crop