منابع مشابه
A century of sprawl in the United States.
The urban street network is one of the most permanent features of cities. Once laid down, the pattern of streets determines urban form and the level of sprawl for decades to come. We present a high-resolution time series of urban sprawl, as measured through street network connectivity, in the United States from 1920 to 2012. Sprawl started well before private car ownership was dominant and grew...
متن کاملHealth System Reform in the United States
In 2010, the United States adopted its first-ever comprehensive set of health system reforms in the Affordable Care Act (ACA). Implementation of the law, though politically contentious and controversial, has now reached a stage where reversal of most elements of the law is no longer feasible. The controversial portions of the law that expand affordable health insurance coverage to most U.S. cit...
متن کاملSprawl in the Western United States: Do State Growth Management Programs Reduce Sprawl?
Sprawl is faulted for contributing to excessive commuting and transportation costs, raising the cost of providing infrastructure and other public services (Carruthers, 2002). With the advent of the environmental movement in the 1960s, concern for the impact urban growth was having on the environment caused a surge of growth management legislation that eventually led to several states implementi...
متن کاملSurgical Procedures of the Elbow: A Nationwide Cross-Sectional Observational Study in the United States
Background: Elbow surgery is shared by several subspecialties. We were curious about the most common elbow surgeries and their corresponding diagnoses in the United States. Methods: We used the National Hospital Discharge Survey (NHDS) and the National Survey of Ambulatory Surgery (NSAS) data gathered in 2006-databases that together provide an estimate of all inpatient and ambulatory surgic...
متن کاملcentury drought in the conterminous United States
Droughts can be characterized by their severity, frequency and duration, and areal extent. Depth-area-duration analysis, widely used to characterize precipitation extremes, provides a basis for evaluation of drought severity when storm depth is replaced by an appropriate measure of drought severity. We used gridded precipitation and temperature data to force a physically-based macroscale hydrol...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2015
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1504033112