We have investigated the population distribution of Chinese cities from 1997 to 2006. The rank-size distributions of Chinese cities deviate from the Pareto distribution. For city size distribution of each year we can find a population threshold Pc that characterizes the boundary of the deviation. The cities with population more than Pc follow the Pareto distribution, while the smaller cities de...

This paper introduces an analytic framework that can be used to assess the relationships between individual movement differentials and place characteristics, on the one hand, and aggregate mobility levels and city-suburb population change (in size or composition), on the other. Application of this framework using census data for individual metropolitan areas allows the analyst to decompose popu...

Although Aedes fluviatilis is an anthropophilic mosquito found abundantly in urban environments, its biology, epidemiological potential and genetic characteristics are poorly understood. Climate change and urbanization processes that result in environmental modifications benefit certain anthropophilic mosquito species such as Ae. fluviatilis, greatly increasing their abundance in urban areas. T...

Evidence from the literature has shown that people with a lower socioeconomic status enjoy less good health than people with a higher socioeconomic status. The Italian deprivation index (DI) was used with the aim to evaluate the association between the DMFT index and risk factors for dental caries, including city population and DI. The study included 4,305 12-year-old children living in 38 citi...

Motivated by empirical evidence on the interplay between geography, population density and societal interaction, we propose a generative process for the evolution of social structure in cities. Our analytical and simulation results predict both super-linear scaling of social-tie density and information contagion as a function of the population. Here we demonstrate that our model provides a robu...

This paper presents the prevalence rates of schizophrenia and major affective disorders by age and race among a random sample of male jail detainees. Subjects were administered the National Institute of Mental Health Diagnostic Interview Schedule (NIMH-DIS). The jail prevalence rates were then compared with general population data from the five-city Epidemiologic Catchment Area program using di...

This study attempts to measure and characterize urban sprawl using its multiple dimensions in the Jamnagar city, India. The study utilized the multi-date satellite images acquired by CORONA, IRS 1D PAN & LISS-3, IRS P6 LISS-4 and Resourcesat-2 LISS-4 sensors. The extent of urban growth in the study area was mapped at 1:25,000 scale for the years 1965, 2000, 2005 and 2011. The growth of urban ar...

A study using 1800 "lost letters" was designed to test the hypothesis that returned responses would be greater in smaller rural communities (population M = 964) than in a city (population = 60,591) or the suburbs (population = 195,847) unless the addressee was affiliated with a pro-abortion group. Returns to control, Committee For Free Abortion, and Committee Against Free Abortion affiliates we...

T he answers to important questions in urban economics depend on the density of population, not the size of population. In particular, positive production or residential externalities, as well as negative externalities such as congestion, are typically modeled as a function of density (Chatterjee and Carlino 2001, Lucas and Rossi-Hansberg 2002). The speed with which new knowledge and production...

This paper provides a recent account of the distribution of manufacturing activity across cities in the U.S. After years of nationwide decline in manufacturing employment, and migration of manufacturing plants to suburbs and rural areas, the following pattern emerges for overall manufacturing as of 1990: i) Number of manufacturing establishments increases more than proportionally with city popu...