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At least 127 records · Page 7Linked to original sources
PubMed1994

[Regional differences and problems of population development in Croatia, 1948-1991].

The authors analyze changes in population size and density in Croatia from 1948 to 1991. "Since the end of World War II the population growth rate has been in a permanent decline in Croatia due to occasional intense emigration, but also due to decrease in the number of newborn and increased number of deaths (ageing of the population in spite of higher living standards). This has been happening all over Croatia, which displays great differences in population density.... Polarization is significant also in migration of the population in urban and rural settlement...." (SUMMARY IN ENG)

Birth Rate↗
PubMed1983

Population redistribution within the rural-urban fringe: a typology of small towns and rural municipalities in the state of New Jersey.

Population redistribution within the rural-urban fringe of the United States is examined using the state of New Jersey over the period 1970-1980 as an example. "This article provides additional evidence for the redistribution of population to the rural-urban fringe and identifies those types of municipalities that experienced the greatest growth during the 1970s. Furthermore, it finds that the factors that account for population growth at the rural-urban fringe are not only those associated with suburbanization, but also those associated with nonmetropolitan growth. It also demonstrates that population growth at the rural-urban fringe varies not only by municipal type but also by race."

Americas↗
PubMedDate not supplied

Abortion services in the United States, 1987 and 1988.

A 1989 survey by The Alan Guttmacher Institute shows that 1.6 million abortions were performed in the United States in 1988, a number that has remained relatively unchanged since 1980. More than 98 percent of abortions in 1987-1988 were performed in metropolitan areas. Although 51 percent of metropolitan counties have no provider of abortion services, 93 percent of nonmetropolitan counties are without a provider. The lack of abortion services in nonmetropolitan areas has been intensified by a 13 percent reduction since 1985 in the number of hospitals that offer abortion services. The number of nonhospital facilities providing abortion services increased by four percent, however, and specialized clinics provided 64 percent of all abortions performed in 1988.

Abortion, Legal↗
PubMed2005

Spatial variations in selected metal contents and particle size distribution in an urban and rural atmosphere of Islamabad, Pakistan.

Spatial variations in total suspended particulate matter (TSP) were investigated for distribution of metals and particle size fractions in the urban and rural atmosphere of Islamabad, Pakistan. The metals Na, K, Fe, Mn, Pb, Cd, Cr, Zn, Ni and Co, and the particle fractions <2.5, 2.5-10, 10-100 and >100 microm were included in the study. TSP samples were trapped on glass fibre filters using high volume samplers and quantification of metals was done using Atomic Absorption Spectrometry employing HNO(3) based wet digestion. At the urban site, Na was dominant at 2.384 microg/m(3) followed by K, Fe and Zn with 0.778, 0.667 and 0.567 microg/m(3) as mean concentrations, respectively. The metal levels for the rural site ranged from 0.002 microg/m(3) for Cd to 1.077 microg/m(3) for Na. However, compared with the urban site, mean Pb concentration showed an almost two-fold enhancement, i.e., 0.163 Vs. 0.327 microg/m(3). Metals and particle size source identification was done using Principal Component Analysis and Cluster Analysis. Five sources were traced out for the urban site: industrial, soil, automobile emissions, metallurgical industries and excavation activities. For the rural site, four sources were recorded: agricultural, automotive emissions, excavation activities and metallurgical units. Collectively, for both the sites, PM(10-100) emerged as a major contributor to TSP, followed by PM(2.5-10), PM(<2.5) and PM(>100) in that order. The metals showed in general positive relationship with fine particulate fractions (PM(2.5-10), PM(<2.5)), and negative correlation with coarse fractions (PM(10-100), PM(>100)). Comparison with the corresponding data from various Asian sites revealed that the levels of Na, K, Fe, Mn, Co and Ni for the present study were lower than those reported for grossly polluted cities of the world.

Agriculture↗
PubMed1997

A spatial equilibrium model for region size, urbanization ratio, and rural structure.

"Earlier economic models of city size have either focused on urban agglomeration effects while ignoring the spatial structure of the rural hinterland, or made unrealistic assumptions (for example, uniform rural population distribution) so as to simplify the problem. Following the classic von Thunen framework, we present a two-sector spatial equilibrium model of a city located at the center of an agricultural hinterland. The city produces industrial goods, and the rural area produces agricultural goods. Both goods are consumed both by urban and by rural residents. Market equilibrium for these goods determines: (1) the spatial size of the region, (2) the urbanization ratio (urban to total population) and the population size of the city, and (3) the rural spatial structure (wage, population distribution, land rent, and agricultural yield). Given various sets of exogenous parameters pertaining to the industrial, agricultural, and transportation production functions and to population preferences, the model is solved numerically, and response functions are estimated and analyzed."

Agriculture↗
PubMed2006

Different spatial distribution of Aedes aegypti and Aedes albopictus along an urban-rural gradient and the relating environmental factors examined in three villages in northern Thailand.

A larval survey of dengue vectors was conducted from July to November 1966 and from May to November 1997 in Chiangmai Province, Thailand. Three villages in urban, transition, and rural areas were selected for the survey to clarify the spatial distribution of Ae. aegypti and Ae. albopictus along an urban-rural ecological gradient. The average number of Ae. aegypti larvae in larvitraps was higher in the urban area than in the rural area, as we expected, whereas the opposite was found for Ae. albopictus, rural area > urban area. A house survey of larvae-inhabiting containers showed significant differences in the number and composition of these containers among the study areas. Significant differences were also found in the average distance between houses, average tree height, and average percentage of vegetation cover for each house. The seasonal pattern of rainfall recorded in each study area did not show great differences among the study areas. The response of Ae. aegypti and Ae. albopictus to the urban-rural gradient is discussed in relation to the possibility of applying geographic information system techniques to plan the control strategy and surveillance of dengue vectors.

Aedes↗