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A Spectroscopic and Photometric Study of Short-Timescale Variability in NGC 5548
(2001)
Results of a ground-based optical monitoring campaign on NGC 5548 in June 1998 are presented. The broad-band fluxes (U, B, V), and the spectrophotometric optical continuum flux F wavelength (5100 Å) monotonically decreased ...
Observation of Quantum Shock Waves Created With Ultra-Compressed Slow Light Pulses in a Bose-Einstein Condensate
(American Association for the Advancement of Science, 2001)
We have used an extension of our slow light technique to provide a method for inducing small density defects in a Bose-Einstein condensate. These sub- resolution, micrometer-sized defects evolve into large-amplitude sound ...
Split Attractor Flows and the Spectrum of BPS D-branes on the Quintic
(Institute of Physics, 2001)
We investigate the spectrum of type IIA BPS D-branes on the quintic from a four dimensional supergravity perspective and the associated split attractor flow picture. We obtain some very concrete properties of the (quantum ...
Ion-beam Sculpting at Nanometre Length Scales
(Nature Publishing Group, 2001)
Manipulating matter at the nanometre scale is important for many electronic, chemical and biological advances, but present solid-state fabrication methods do not reproducibly achieve dimensional control at the nanometre ...
Observation of Coherent Optical Information Storage in an Atomic Medium Using Halted Light Pulses
(Nature Publishing Group, 2001)
Electromagnetically induced transparency(1-3) is a quantum interference effect that permits the propagation of light through an otherwise opaque atomic medium; a 'coupling' laser is used to create the interference necessary ...
Envelope Structure of Synechococcus sp. WH8113, A Nonflagellated Swimming Cyanobacterium
(BioMed Central, 2001)
Background: Many bacteria swim by rotating helical flagellar filaments [1]. Waterbury et al. [15] discovered an exception, strains of the cyanobacterium Synechococcus that swim without flagella or visible changes in shape. ...
Bilayer Coherent and Quantum Hall Phases: Duality and Quantum Disorder
(American Physical Society (APS), 2001)
We consider a fully spin-polarized quantum Hall system with no interlayer tunneling at total filling factor n 3 1 k (where k is an odd integer) using the Chern-Simons-Ginzburg-Landau theory. Exploit- ing particle-vortex ...
Bilayer paired quantum Hall states and Coulomb drag
(American Physical Society (APS), 2001)
We consider a number of strongly correlated quantum Hall states that are likely to be realized in bilayer quantum Hall systems at total Landau level filling fraction T 1. One state, the (3,3, 1) state, can occur as an ...
Resonant versus nonresonant nuclear excitation of 115 In by positron annihilation
(American Physical Society (APS), 2001)
We have measured the resonant cross section σn for nuclear excitation of 115In via the radiationless annihilation of a positron with a K-shell electron using a monoenergetic positron beam and a thin In target. We find an ...
(De)Constructing Dimensions
(American Physical Society (APS), 2001)
We construct renormalizable, asymptotically free, four dimensional gauge theories that dynamically generate a fifth dimension.