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Results for “Urban Spatial Distribution”

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PubMed1979

Mexican urbanization since 1821: a macro-historical approach.

The development of the urban system in Mexico since 1821 is analyzed. The "analysis attempts to treat the temporal and spatial diversity of the urban process by first presenting a chronological overview of urbanization for the country as a whole and then considering four important cases of urban development. The particular experiences of Mexico City, Oaxaca City, Merida, and Monterrey will serve to show the regional dimensions of urbanization since 1821 within the broader national and international context."

Americas↗
PubMed1980

The role of long distance migration in the rural renaissance, in gentrification, and in growth of the Sunbelt.

The author "has examined trends in interstate migration during the 1970s for the four regions of the United States and, in particular, explored the relationship of this migration with nonmetropolitan expansion and the return to the city movement. The data show that the former trend is a very real one which has persisted throughout the decade and that population growth through interstate migration in nonmetropolitan America is, on balance, the result of nonblacks moving to the South from elsewhere in the nation. Except in the West, central cities continue to experience substantial losses of population through interstate migration. Interstate migration continues to be directed toward suburbs, and is especially vigorous in the West." Data are from the March 1975 and March 1979 Current Population Surveys.

Americas↗
PubMed1985

Integration and ethnic spatial concentration: the changing distribution of the Anglo-Jewish community.

"This paper identifies the changing locational patterns of the Jewish community in Britain during the past century. Two major trends are identified. At the national level there has been movement out of many small provincial communities to the large urban centres, particularly Greater London and Manchester. Within the city, there has been movement out of the traditional inner city ghettos to the suburbs, thus reflecting the upward socio-economic mobility and integration of what was an immigrant group. Both these trends closely mirror the general patterns of population movement in Britain during the twentieth century." The lack of reliable data for the Jewish population is noted, and a methodology is suggested for identifying the changing locational patterns and intensity of Jewish community life. The method is applied to the case of Greater London.

Acculturation↗
PubMed2003

Spatial distribution of heavy metals in urban soils of Naples city (Italy).

Concentrations of surface and sub-surface soil Cu, Cr, Pb and Zn in the Naples city urban area were measured in 1999. Contourmaps were constructed to describe the metals spatial distribution. In the most contaminated soil samples, metals were speciated by means of the European Commission sequential extraction procedure. At twelve sites, Cu, Pb and Zn levels in soil were compared with those from a 1974 sampling. Many surface soils from the urban area as well as from the eastern industrial district contained levels of Cu, Pb and Zn that largely exceeded the limits (120, 100 and 150 mg kg(-l) for Cu, Pb and Zn, respectively) set for soils of public, residential and private areas by the Italian Ministry of Environment. Chromium values were never above regulatory limits(120 mg kg(-1)). Copper apparently accumulates in soils contiguous to railway lines and tramway. Cu and Cr existed in soil mainly inorganic forms (-68%), whereas Pb occurs essentially as residual mineral phases (77%). The considerable presence of Zn in the soluble, exchangeable and carbonate bound fraction (23%) suggests this element has high potential bioavailability and leachability through the soil. Concentrations of Cu, Pb and Zn have greatly increased since the 1974 sampling, with higher accumulation in soils from roadside fields.

Chemical Fractionation↗