Atmospheric solar absorption measurements in the 9-11 micron region using a diode laser heterodyne spectrometer

A tunable diode laser heterodyne radiometer was developed for ground based measurements of atmospheric solar absorption spectra in the 9 to 12 micron spectral range. The performance and operating characteristics of this tunable infrared heterodyne radiometer (TIHR) is discussed along with recently measured heterodyne solar absorption spectra in the 10 to 11 micron spectral region

Atmospheric solar absorption measurements in the 9 to 11 mu m region using a diode laser heterodyne spectrometer

A tunable diode laser heterodyne radiometer was developed for ground-based measurements of atmospheric solar absorption spectra in the 8 to 12 microns spectral range. The performance and operating characteristics of this Tunable Infrared Heterodyne Radiometer (TIHR) are discussed along with atmospheric solar absorption spectra of HNO3, O3, CO2, and H2O in the 9 to 11 microns spectral region

Ambient ammonia measurements using laser photo-acoustic spectroscopy

Ammonia concentrations reached minimal levels (approximately 0.1 ppb) in early winter, followed by a sudden later winter increase. A direct relationship between ambient ammonia levels and air temperature was inferred from the data (linear correlation coefficient r=0.53). Ammonia concentrations were determined to be directly related to the absolute humidity of the air (r=0.72); a weaker relationship between ammonia concentrations and relative humidity was discovered (r=0.37). The data also indicated that ammonia levels were generally higher within continental air masses than those of maritime origin. Soil parameters such as pH and moisture content were found to have a major bearing on the release of gaseous ammonia from soils in the region

Inconsistent VAP definitions raise questions of usefulness

Ventilator Associated Pneumonia (VAP) is recognised as one of the most frequent nosocomial infections in Intensive Care Unit (ICU), with infection rates varying from 10 to 30% of mechanically ventilated patients. VAP is undoubtedly a burden on the health care system and has been associated with adverse patient outcomes; increases in ICU Length of stay (LOS), hospital LOS and crudely associated with increased mortality. Furthermore, it has been widely reported to impact on health care resources resulting in significant inflation of health care costs

Mineralogy and trace-element composition of ash and pumice soils in the Pacific Northwest of the United States

Published May 1969. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Effect of dispersion techniques on mechanical analysis of Oregon soils

Published October 1967. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo