Development of remote sensing technology in New Zealand, part 1. Mapping land use and environmental studies in New Zealand, part 2. Indigenous forest assessment, part 3. Seismotectonic, structural, volcanologic and geomorphic study of New Zealand, part 4

The author has identified the following significant results. As part of the tape reformatting process, a simple coded picture output program was developed. This represents Pixel's radiance level by one of a 47 character set on a nonoverprinting line printer. It not only has aided in locating areas for the reformatting process, but has also formed the foundation for a supervised clustering package. This in turn has led to a simplistic but effective thematic mapping package

Inclusion de sens dans la représentation de documents textuels : état de l'art

Ce document donne un aperçu de l'état de l'art dans le domaine de la représentation du sens dans les documents textuels

Seismotectonic, structural, volcanologic, and geomorphic study of New Zealand; indigenous forest assessment in New Zealand; mapping, land use, and environmental studies in New Zealand, volume 1

The author has identified the following significant results. Results of the atmospheric extinction measurements show clearly the greater opacity of the atmosphere in MSS band 4 which is due to Rayleigh scattering. Atmospheric water vapor absorbs strongly in a wide region between 900 nm and 1000 nm, and this results in a consistently higher extinction coefficient than would otherwise be expected in MSS band 7. The short term fluctuations tend to be greater in band 7 than in the other bands, and this effect is probably due to variations of water vapor concentration in the instrument line of sight. These high extinction coefficients and short term fluctuations in band 7 were observed at Menindee which is in a semi-desert region in western New South Wales

Fifty years of UK research in information science

An attempt is made to discern the main research themes in British information science over the past half-century. Within these themes, emphasis is placed on research in the UK that has had some impact on the international information science community. The major factors affecting information research in the UK are also briefly considered

Special Libraries, February 1956

Volume 47, Issue 2https://scholarworks.sjsu.edu/sla_sl_1956/1001/thumbnail.jp

Nitrogen oxides in the arctic stratosphere: Implications for ozone abundances

Thesis (Ph.D.) University of Alaska Fairbanks, 1994In the high latitude winter stratosphere, NO\sb2 sequesters chlorine compounds which are extremely efficient at destroying ozone. During the nighttime, NO\sb2 reacts with ozone to form \rm N\sb2 O\sb5 which acts as a reservoir of NO\sb2. Under heavy aerosol loading, \rm N\sb2O\sb5 may react with water on aerosol surfaces to form HNO\sb3, a reservoir more resistant to photolysis. This heterogeneous reaction results in reduced NO\sb2 concentration when the sun returns at the end of the winter. A spectrograph system has been developed to measure scattered zenith skylight and thereby determine stratospheric NO\sb2 slant column abundance. Conversion of the measured slant column abundance to vertical column abundance requires dividing by the air mass. The air mass is the enhancement in the optical path for the scattered twilight as compared to a vertical path. Air mass values determined using a multiple scattering radiative transfer code have been compared to those derived using a Monte Carlo code and were found to agree to within 6% at a 90\sp\circ solar zenith angle for a stratospheric absorber. Six months of NO\sb2 vertical column abundance measured over Fairbanks during the winter 1992-93 exhibited the daylight diminished and increased as the sunlight hours lengthened. The overall seasonal behavior was similar to high-latitude measurements made in the Southern Hemisphere. The ratios of morning to evening column abundance were consistent with predictions based on gas-phase chemistry. The possible heterogeneous reaction of \rm N\sb2O\sb5 on sulfate aerosols was investigated using Fourier Transform Infrared Spectrometer measurements of \rm HNO\sb3 column abundance and lidar determinations of the aerosol profile. Using an estimated \rm N\sb2O\sb5 column abundance and aerosol profile as input to a simple model, significant \rm HNO\sb3 production was expected. No increase in \rm HNO\sb3 column abundance was measured. From this set of data, it was not possible to determine whether significant amounts of \rm N\sb2O\sb5 were converted to \rm HNO\sb3 by this heterogeneous reaction. Better estimates of the \rm N\sb2O\sb5 and aerosol profile, and a more continuous set of \rm HNO\sb3 measurements, are needed to determine if \rm HNO\sb3 was actually produced