79,833 research outputs found
Parameter plane analysis of forced nonlinear oscillations
Parameter plane analysis of forced oscillations and jump resonance phenomena in nonlinear system
Classical Sphaleron Rate on Fine Lattices
We measure the sphaleron rate for hot, classical Yang-Mills theory on the
lattice, in order to study its dependence on lattice spacing. By using a
topological definition of Chern-Simons number and going to extremely fine
lattices (up to beta=32, or lattice spacing a = 1 / (8 g^2 T)) we demonstrate
nontrivial scaling. The topological susceptibility, converted to physical
units, falls with lattice spacing on fine lattices in a way which is consistent
with linear dependence on (the Arnold-Son-Yaffe scaling relation) and
strongly disfavors a nonzero continuum limit. We also explain some unusual
behavior of the rate in small volumes, reported by Ambjorn and Krasnitz.Comment: 14 pages, includes 5 figure
Ring counter may be advanced or retarded by command signal
A power logic circuit, with bidirectional capability, is used to drive small loads in planned sequence. This is designed in the form of a shift register, with a reversible ring counter
Reversible ring counter employing cascaded single SCR stages Patent
Reversible ring counter using cascaded single silicon controlled rectifier stage
Waveform simulator Patent
Sign wave generation simulator for variable amplitude, frequency, damping, and phase pulses for oscilloscope displa
Standoff tool speeds placement of friction-fit electrical terminals
Hand operated tool inserts terminals through compartment walls in electronic equipment. The tool is in the configuration of a modified pair of pliers with jaws consisting of a split chuck and anvil
Defect Formation with Bulk Fields
It has recently been realized that brane-antibrane annihilation (a possible
explanation for ending inflation) may result in defect formation, due to the
dynamics of the tachyon field. Studies of this possibility have generally
ignored the interaction of the brane fields with fields in the bulk; recently
it has been argued [1] that interactions with bulk fields suppress or even
eliminate defect formation.
To investigate the impact of bulk fields on brane defect formation, we
construct a toy model that captures the essential features of the tachyon
condensation with bulk fields. We study the structure of defects in this toy
model, and simulate their formation and evolution on the lattice. We find that,
while the energetics and interactions of defects are influenced by the size of
the extra dimension and the bulk-brane coupling, the bulk-brane coupling does
not prevent the formation of a defect network.Comment: 23 pages, 5 figures, revtex4, 2 appendices adde
Performance of two 10-lb/sec centrifugal compressors with different blade and shroud thicknesses operating over a range of Reynolds numbers
Centrifugal compressors often cannot be directly scaled to very small flow sizes because of structural and manufacturing limitations. The inability to directly scale all design parameters leads to a performance loss other than that which can be associated with the lower Reynolds number. A 10-lb/sec centrifugal compressor was scaled down to 2-lb/sec where adjustments to blade and shroud thickness and fillet radii were required. The modified 2-lb/sec compressor was then directly scaled back up to 10 lb/sec so that the effect of the modifications could be determined. The performance of the two 10-lb/sec compressors is compared over a range of speed and mass flow. The effect of variations in Reynolds number, impeller tip clearance, and shroud thickness on compressor performance is also presented
Low-threshold analysis of CDMS shallow-site data
Data taken during the final shallow-site run of the first tower of the Cryogenic Dark Matter Search (CDMS II) detectors have been reanalyzed with improved sensitivity to small energy depositions. Four ~224 g germanium and two ~105 g silicon detectors were operated at the Stanford Underground Facility (SUF) between December 2001 and June 2002, yielding 118 live days of raw exposure. Three of the
germanium and both silicon detectors were analyzed with a new low-threshold technique, making it possible to lower the germanium and silicon analysis thresholds down to the actual trigger thresholds of ~1 and ~2 keV, respectively. Limits on the spin-independent cross section for weakly interacting massive particles (WIMPs) to elastically scatter from nuclei based on these data exclude interesting parameter space for WIMPs with masses below 9 GeV/c^2. Under standard halo assumptions, these data partially exclude parameter space favored by interpretations of the DAMA/LIBRA and CoGeNT experiments’ data as WIMP signals, and exclude new parameter space for WIMP masses between 3 and 4 GeV/c^2
HCMM energy budget data as a model input for assessing regions of high potential groundwater pollution
The author has identified the following significant results. Significant relationships were found between surface soil temperatures estimated from HCMM radiometric temperatures and depth to ground water and near surface soil moisture
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