Agglomeration and intra-firm linkage in R and D location in the United States
Research and development (R and D) activities in the United States, as in other advanced economies, are geographically concentrated relative to other economic activities. When examined at the scale of the metropolitan area and standardized
by population, only a small number of urban regions are significant complexes of R and D. Only ten urban regions are concentrations of both private R and D and overall R and D employment in the United States, but these are distributed in all regions
Topoedaphic unit analysis: a site classification system for reclaimed mined lands
Discriminant analysis ; Environment ; North Dakota ; Principal components analysis ; Soil ; Soil conservation ; Soil properties ; Statistics ; Topography ; United States ; Vegetation
The aim of this paper is to outline a land classification system for reclaimed mined lands based on the use of topoedaphic units. The AA. describe the statistical methods used to delineate topoedaphic units and the discriminant model developed
for topoedaphic unit classification. They use data from the Glenharold Mine, North Dakota, USA.
Entreprise ; Géographie de l'Océanie ; Nouvelle-Zélande ; Source documentaire ; Unité de production
The directory contains information on individual operating units of multi-plant enterprises. Information collected includes fine detail on spatial location and the births, deaths, ownership and mergers of different units.
Soil variability in geomorphologically defined survey units in the Albudeite area of Murcia province, Spain in Soils and geomorphology.
Albudeite ; Espagne ; Géographie de l'Europe ; Géomorphogenèse ; Murcia ; Pédologie ; Ressource naturelle ; Taxonomie ; Unité de paysage ; Unité pédologique ; Utilisation du sol
Les classes de terrain définies sur la base de caractéristiques géomorphologiques donnent des unités au sol plus uniformes en termes de propriétés du sol que le paysage globalement.
Variation of the Köppen C/D climate boundary in the central United States during the 20th century
Climate ; Climatic trend ; Climatic variation ; Climatic warming ; Iowa ; Kansas ; Missouri ; Nebraska ; Snow ; Snow cover ; Temperature ; Twentieth Century ; United States of America ; Winter
The spatial and temporal variation of the C/D Köppen climate boundary in the central United States is examined for the period 1900 to 1999. The C/D climate boundary is determined by differences in winter conditions. It represents the equatorward
warming and a northerly migration of the C/D climate boundary within the central United States.
edge of a persistent snow cover during winter. The most anomalous feature for the decadal maps is the distinct southerly location of the C/D boundary for the recent decade of the 1970s. This study does not provide evidence of a trend toward wintertime
Variability in high temperature extremes in the southeastern United States
Climatology ; Drought ; Forecast ; Seasonal variation ; Southern United States ; Spatial variation ; Statistics ; Temperature ; United States
Forty-one years of data from 13 first-order National Weather Service stations in the southeastern United States were analyzed to determine the spatial variability in the frequency and duration of hours and days when temperatures were ≥32°C (high
Synoptic-scale variability in the probability of precipitation from thunderstorms in the United States
A synoptic-scale climatology of precipitation amounts from thunderstorms is developed by analysis of amounts from individual storms for 220 stations in the conterminous United States for the period 1948-1977. The probability of having a thunderstorm
Geographic research ; Landscape analysis ; Landscape unit ; Regional geography ; Regionalization ; Slovenia
This article establishes whether Slovenia’s landscape diversity and its position at the intersection of four major European geographical units (the Alps, the Mediterranean, the Pannonian Basin, and the Dinaric Alps) is also reflected in non
Riftward younging of volcanic units in the Addis Ababa region, Ethiopian rift valley
A general riftward younging of surficial volcanic units is a feature of the Addis Ababa sector of the Ethiopian rift valley. The narrowing of the volcanic zone with time in due to crustal necking and topographical control.