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W H Walters

Publications and source records attributed to W H Walters.

5 recordsLinked to original sources
PubMed1997

A digital map of Public-Use Microdata Areas in the 1990 U.S. census.

"Public-Use Microdata Areas (PUMAs) are the smallest geographic units for which many U.S. Census variables are reported. In particular, 1990 microdata records for households and individuals can be aggregated only by PUMA, metropolitan area, state, and region. The Census Bureau distributes maps of these PUMAs only on paper, however, and only for individual states. This note describes the construction of a national, digital base map of the PUMAs used in the 1990 U.S. Census microdata files (5% sample)."

Americas↗
PubMed1996

Reconstruction of radioactive contamination in the Columbia River.

As part of the Hanford Environmental Dose Reconstruction Project, an unsteady flow hydraulic model, modified to include radionuclide decay, was used to simulate the transport of radionuclides released to the Columbia River from Hanford. The model was applied to the river from Priest Rapids Dam to the vicinity of Portland, Oregon, for the period from January 1950 through January 1971. Model output consisted of monthly-average water concentrations for 24Na, 32P, 65Zn, 76As, and 239Np. Model validation was accomplished by comparing computed water depths and 51Cr concentrations to measured field data. This paper discusses the modeling approach and compares the results to historical river monitoring data collected during the peak years of operation.

Arsenic↗
PubMed1994

Climate and U.S. elderly migration rates.

"This study investigates the impact of climate on [U.S.] metropolitan elderly migration rates. Factor analysis is used to identify six factors within a set of forty climatic variables. These six factors, along with eleven nonclimatic variables, are used to predict elderly in- and outmigration rates. Metropolitan areas with mild winters and low average incomes are attractive to elderly inmigrants, while those with high rents and clear, dry summers are likely to lose older residents through outmigration. These findings are consistent with the life course model of mobility, and with the distinction between conservative and innovating migrants."

Adult↗