Based on field data from 10 USA cities and national urban tree cover data, it is estimated that urban trees in the coterminous USA currently store 700 million tonnes of carbon ($14,300 million value) with a gross carbon sequestration rate of 22.8 million tC/yr ($460 million/year). Carbon storage within cities ranges from 1.2 million tC in New York, NY, to 19,300 tC in Jersey City, NJ. Regions w...

This paper proposes a theory of city size distribution via a hierarchy approach rather than the popular random growth process. It does so by formalizing central place theory using an equilibrium entry model and specifying the conditions under which city size distribution follows a power law. Central place theory describes the way in which a hierarchical city system with different layers of citi...

there are continuous connections between a city and its periphery and the form of these relations varies. collection of these relations makes an influential area forming the various relations between the city and periphery. these relations are not the same and do not have unique concentration and density rather, they hey depend on population, geographic conditions and the role of the city in th...

Central city infrastructure development in the nineteenth and twentieth centuries, in areas such as sewerage, water works, street lighting, and street pavement, was an important cause of suburban municipal autonomy by the time of the Great Depression. Suburban autonomy was in turn an important factor in the racial and economic transformations that were visible in central cities by the 1950s. Th...

urban design has been used in the cities throughout the world to achieve certain goals and purposes. it has been common in developing countries, including iran, to use urban regeneration plans in the older sections of large cities to eliminate urban blight and decay, and eventually achieve modernization and in some cases to also overcome socio-economic and cultural problems. approaches have bee...

We present results of a forecast initiated Week 49 (beginning December 9, 2012) of the 2012-2013 influenza season for municipalities in the United States. The forecast was made on December 14, 2012. Results from forecasts initiated the two previous weeks (Weeks 47 and 48) are also presented. Also results from the forecast generated with the SIRS model without absolute humidity forcing (no AH) a...

The new regionalism tends to emphasize the commonalities of central cities and their suburbs. Los Angeles County has surprisingly minor differences between central city and suburb—leading one to wonder why municipal alliances across jurisdictional lines have not been more prominent. The author tackles this anomaly by breaking L.A. County into 58 different areas and tracking demographic and econ...

The recent earthquake that shook Central Italy confirmed once again the country’s vulnerability. These events have serious consequences on the lives of cancer patients and on the organization of health care assistance. After the earthquake in Central Italy, as well as after the ones in L’Aquila and Emilia Romagna, nearby hospitals were declared unfit. Thus, patients were deprived of their refer...

Hexagonal population distributions of several sizes are shown to be selforganized from a uniformly inhabited state, which is modeled by a system of places (cities) on a hexagonal lattice. Microeconomic interactions among the places are expressed by a core–periphery model in new economic geography. Lösch’s ten smallest hexagonal distributions in central place theory are guaranteed to be existent...