16,268 research outputs found
Parametric microwave noise generator Patent
Radio frequency noise generator having microwave slow-wave structure in gas discharge plasm
Point process modeling of wildfire hazard in Los Angeles County, California
The Burning Index (BI) produced daily by the United States government's
National Fire Danger Rating System is commonly used in forecasting the hazard
of wildfire activity in the United States. However, recent evaluations have
shown the BI to be less effective at predicting wildfires in Los Angeles
County, compared to simple point process models incorporating similar
meteorological information. Here, we explore the forecasting power of a suite
of more complex point process models that use seasonal wildfire trends, daily
and lagged weather variables, and historical spatial burn patterns as
covariates, and that interpolate the records from different weather stations.
Results are compared with models using only the BI. The performance of each
model is compared by Akaike Information Criterion (AIC), as well as by the
power in predicting wildfires in the historical data set and residual analysis.
We find that multiplicative models that directly use weather variables offer
substantial improvement in fit compared to models using only the BI, and, in
particular, models where a distinct spatial bandwidth parameter is estimated
for each weather station appear to offer substantially improved fit.Comment: Published in at http://dx.doi.org/10.1214/10-AOAS401 the Annals of
Applied Statistics (http://www.imstat.org/aoas/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Superconducting six-axis accelerometer
A new superconducting accelerometer, capable of measuring both linear and angular accelerations, is under development at the University of Maryland. A single superconducting proof mass is magnetically levitated against gravity or any other proof force. Its relative positions and orientations with respect to the platform are monitored by six superconducting inductance bridges sharing a single amplifier, called the Superconducting Quantum Interference Device (SQUID). The six degrees of freedom, the three linear acceleration components and the three angular acceleration components, of the platform are measured simultaneously. In order to improve the linearity and the dynamic range of the instrument, the demodulated outputs of the SQUID are fed back to appropriate levitation coils so that the proof mass remains at the null position for all six inductance bridges. The expected intrinsic noise of the instrument is 4 x 10(exp -12)m s(exp -2) Hz(exp -1/2) for linear acceleration and 3 x 10(exp -11) rad s(exp -2) Hz(exp -1/2) for angular acceleration in 1-g environment. In 0-g, the linear acceleration sensitivity of the superconducting accelerometer could be improved by two orders of magnitude. The design and the operating principle of a laboratory prototype of the new instrument is discussed
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