This paper proposes gridless sparse direction-of-arrival (DOA) refinement using gradient-based optimization.The objective function minimizes the fit between the sample covariance matrix (SCM) and a reconstructed covariance matrix.The latter is constrained to contain only a few atoms, but otherwise maximally matches the SCM.This reconstruction enabl
ABSTRACT Methanotrophs, which help regulate atmospheric levels of methane, are active in diverse natural and man-made environments.This range of habitats and the feast-famine cycles seen by many environmental methanotrophs suggest that methanotrophs dynamically mediate rates of methane oxidation.Global methane budgets require ways to account for th
Wind-blown fugitive dust is a widespread problem in the arid west resulting from land disturbance or abandonment and increasingly limited water supplies.Soil-derived particles obstruct visibility, cause property damage and contribute to violations of health-based air quality standards for fine particles (PM-10).These dry lands are often difficult t