We present the first measurement of the faint end of the QSO luminosity function at z = 3. The QSOs, which range from M1450 = −21 to M1450 = −27, were discovered in 17 fields totaling 0.43 deg using multicolor selection criteria (the Lyman break technique) and spectroscopic followup. We find that the faintend slope of the luminosity function is βl = 1.24± 0.07 (Φ ∝ L l), flatter than the value ...

Hilary Downes, David W Mittlefehldt, Pierre Hudon, Christopher S. Romanek and Ian Franchi Lunar and Planetary Institute, Houston, Texas, USA ([email protected]); School of Earth Sciences, Birkbeck, University of London, London, UK; NASA/Johnson Space Centre, Houston, Texas, USA; Dept. of Earth and Planetary Sciences, McGill University, Montreal, Quebec, Canada; 5 Savannah River Ecology Labora...

A new, comprehensive study by an international team of scientists, including scientists at Boston University in the US and the Universities of Viçosa and Campinas in Brazil, has been published in the current issue of Science (August 26, 2011) refuting earlier alarmist claims that drought has induced a decline in global plant productivity during the past decade and posed a threat to global food ...

The accuracy of the prognostic, physically-based aerosol activation parameterization of Nenes and Seinfeld [2003] (NS) with modifications introduced by Fountoukis and Nenes [2004] (modified NS) is evaluated against extensive microphysical data sets collected on board the CIRPAS Twin Otter aircraft for cumuliform and stratiform clouds of marine and continental origin. The cumuliform cloud data w...

The Quasi-biennial Oscillation and annual variations in tropical ozone from SHADOZ and HALOE J. C. Witte, M. R. Schoeberl, A. R. Douglass, and A. M. Thompson Science Systems and Applications Inc., Lanham, Maryland, USA NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Pennsylvania State University, University Park, Pennsylvania, USA Received: 22 January 2008 – Accepted: 26 February 200...

FRamework Assessing Notorious Contributing Influences for Error (FRANCIE) is a framework and methodology for the systematic analysis, characterization, and prediction of human error. It was developed in a NASA Advanced Concepts Project by Idaho National Engineering and Environmental Laboratory, NASA Ames Research Center, Boeing, and America West Airlines, with input from United Airlines and Ida...

Funding: Wolf Creek Foundation; National Science Foundation. Grant Numbers: CCF-1522054, CNS-1059284, DBI-1939187, ICER-1927646; Aeronautics and Space Administration. Number: NNH12ZDA001N-ECOF; Leon Levy

The purpose of this study was to determine the effects of the integration of automatic speech recognition (ASR) controls and spatial audio displays on soldier workload in noisy, cognitively demanding environments such as armored vehicles. To achieve this end, measures of mental workload were obtained in tasks in which subjects were instructed to give ASR voice commands in response to simulated ...

Analysis of a jet stream induced gravity wave associated with an observed ice cloud over Greenland S. Buss, A. Hertzog, C. Hostettler, T. P. Bui, D. Lüthi, and H. Wernli Institute for Atmospheric and Climate Science, Zürich, Switzerland Laboratoire de Météorologie Dynamique, Palaiseau, France NASA, Langley Research Center, Hampton VA, USA NASA Ames Research Center, Moffett Field CA, USA Receive...