Comparison of advanced gravitational-wave detectors

We compare two advanced designs for gravitational-wave antennas in terms of their ability to detect two possible gravitational wave sources. Spherical, resonant mass antennas and interferometers incorporating resonant sideband extraction (RSE) were modeled using experimentally measurable parameters. The signal-to-noise ratio of each detector for a binary neutron star system and a rapidly rotating stellar core were calculated. For a range of plausible parameters we found that the advanced LIGO interferometer incorporating RSE gave higher signal-to-noise ratios than a spherical detector resonant at the same frequency for both sources. Spheres were found to be sensitive to these sources at distances beyond our galaxy. Interferometers were sensitive to these sources at far enough distances that several events per year would be expected

TURBULENT COUNTERFLOW : VORTEX LINE DENSITY

Une technique de "pulse 2e son" a été développée comme preuve locale de la "vorticité" générée dans un "counterflow" thermique dans l'hélium II. Les mesures de densité des vortex obtenues en utilisant cette technique sont présentées.A second sound burst technique has been developed as a local probe of vorticity generated in thermal counterflow in He II. Measurements of the steady-state vortex line density obtained using this technique are presented

The influence of the chemical composition of drinking water on cuprosolvency by biofilm bacteria

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