نتایج جستجو برای: submillimetre wave spectrum
تعداد نتایج: 432776 فیلتر نتایج به سال:
Bose-Einstein condensates with their superfluidity property provide an interesting parallel to classical fluids. Due the Kolmogorov spectrum of homogeneous turbulence statistics incompressible velocity field is great interest, but in superfluids obtaining quantities such as from macroscopic wavefunction turns out be a complicated task; therefore, most work up now has been numerical nature. We m...
To simulate VFEL operation the superradiance from a short electron pulse moving in a volume diffraction grating is studied. It is supposed that Bragg condition for emitted photons is fulfilled and dynamical diffraction takes place. Spectral-angular distributions for transmitted and diffracted waves are derived. It is shown that the optimal geometry for superradiance exists and it is determined ...
We investigate the spectrum of the linear operator coming from the sine-Gordon equation linearized about a travelling kink-wave solution. Using various geometric techniques as well as some elementary methods from ODE theory, we find that the point spectrum of such an operator is purely imaginary provided the wave speed c of the travelling wave is not ±1. We then compute the essential spectrum o...
This is the first of a series of papers presenting results from the SCUBA Local Universe Galaxy Survey (SLUGS), the first statistical survey of the submillimetre properties of the local universe. As the initial part of this survey, we have used the SCUBA camera on the James Clerk Maxwell Telescope to observe 104 galaxies from the IRAS Bright Galaxy Sample. We present here the 850μm flux measure...
A new wind-input and wind-breaking dissipation for phase-averaged spectral models of wind-generated surface waves is presented. Both are based on recent field observations in Lake George, New South Wales, Australia, at moderate-to-strong wind-wave conditions. The respective parameterizations are built on quantitative measurements and incorporate new observed physical features, which until very ...
R. Nartallo, W. K. Gear, A. G. Murray, E. I Robson and J. H. Hough 1 University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, U.K. 2 Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, U.K. 3 Department of Physics, Queen Mary and Westfield College, Mile End Road, London E1 4NS, U.K. 4 Joint Astronomy Centre, 660 North A’ohōkū Place, University Park, Hilo, Hawaii 96720, USA 5 Division of Ph...
A kinetic theory for radiation interacting with sound waves in an ultrarelativistic electron–positron plasma is developed. It is shown that the effect of a spatial spectral broadening of the electromagnetic pulse is to introduce a reduction of the growth rates for the decay and modulational instabilities. Such spectral broadening could be due to a finite pulse coherence length, or through the u...
Current submillimetre surveys are hindered in their ability to reveal detailed information on the epoch of galaxy formation and the evolutionary history of a high-redshift starburst galaxy population. The difficulties are due to the small primary apertures (D < 15-m) of existing submil-limetre telescopes and the limited sensitivities of their first generation of bolometer cameras. This situatio...
We report on the identification of the highest redshift submillimetre-selected source currently known: LESSJ033229.4−275619.This source was detected in the Large Apex BOlometer CAmera (LABOCA) Extended Chandra Deep Field South (ECDFS) Submillimetre Survey (LESS), a sensitive 870-μm survey (σ870μm ∼ 1.2mJy) of the full 30 × 30 ECDFS with the LABOCA camera on the Atacama Pathfinder EXperiment (AP...
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