scholarly journals Two centuries of settlement and urban development in the United States

2020 ◽  
Vol 6 (23) ◽  
pp. eaba2937 ◽  
Author(s):  
Stefan Leyk ◽  
Johannes H. Uhl ◽  
Dylan S. Connor ◽  
Anna E. Braswell ◽  
Nathan Mietkiewicz ◽  
...  
Keyword(s):  
United States ◽  
Land Use ◽  
Urban Development ◽  
Population Change ◽  
The United States ◽  
Data Availability ◽  
Development Patterns ◽  
The Past ◽  
Resolution Analysis

Over the past 200 years, the population of the United States grew more than 40-fold. The resulting development of the built environment has had a profound impact on the regional economic, demographic, and environmental structure of North America. Unfortunately, constraints on data availability limit opportunities to study long-term development patterns and how population growth relates to land-use change. Using hundreds of millions of property records, we undertake the finest-resolution analysis to date, in space and time, of urbanization patterns from 1810 to 2015. Temporally consistent metrics reveal distinct long-term urban development patterns characterizing processes such as settlement expansion and densification at fine granularity. Furthermore, we demonstrate that these settlement measures are robust proxies for population throughout the record and thus potential surrogates for estimating population changes at fine scales. These new insights and data vastly expand opportunities to study land use, population change, and urbanization over the past two centuries.

DIPHTHERIA IN THE UNITED STATES, 1959-1960

PEDIATRICS ◽  
1962 ◽  
Vol 30 (2) ◽  
pp. 194-205
Author(s):  
Theodore C. Doege ◽  
Clark W. Heath ◽  
Ida L. Sherman
Keyword(s):  
United States ◽  
Communicable Disease ◽  
Case Fatality ◽  
The United States ◽  
Surveillance Data ◽  
Term Trend ◽  
The Past ◽  
Primary Series ◽  
Long Term Trend

Diphtheria attack rates and cases, and to a much lesser extent case-fatality rates, have fallen steadily within the United States during the past 25 years. However, during 1959 and 1960 there was a halt in this long-term trend. Epidemiologic data on 868 clinical cases of diphtheria occurring in 1959 and 873 cases in 1960 were submitted to the Communicable Disease Center by 45 states. The cases and several major outbreaks tended to concentrate in the southern and southwestern states. Attack rates and deaths were highest for children under 10 years, and attack rates were more than five times greater for nonwhite children. Analysis of 1960 immunization data shows that 72% of the patients had received no immunizations. Fifty-five per cent of carriers, but only 18% of persons with bacteriologically confirmed cases, had received a primary series. Only 1 person of 58 fatal cases occurring in 1960 had received a primary series. Certain problems for future investigation, disclosed by the surveillance data, are discussed.

scholarly journals Characterizing Long-Term Land Use/Cover Change in the United States from 1850 to 2000 Using a Nonlinear Bi-analytical Model

AMBIO ◽  
2012 ◽  
Vol 42 (3) ◽  
pp. 285-297 ◽  
Author(s):  
Sanjiv Kumar ◽  
Venkatesh Merwade ◽  
P. Suresh C. Rao ◽  
Bryan C. Pijanowski
Keyword(s):  
United States ◽  
Land Use ◽  
Analytical Model ◽  
The United States

Can Therapy of Hepatitis C Affect the Development of Hepatocellular Carcinoma?

2006 ◽  
Vol 4 (8) ◽  
pp. 751-757 ◽  
Author(s):  
Laura M. Kulik
Keyword(s):  
United States ◽  
Hepatocellular Carcinoma ◽  
Hepatitis C ◽  
Hepatitis B ◽  
Viral Infections ◽  
The United States ◽  
Primary Treatment ◽  
Term Survival ◽  
The Past

Chronic inflammation induced by viral infections and their role in carcinogenesis is well recognized. Two hepatotropic viruses, hepatitis B and hepatitis C (HCV), have been linked worldwide to the development of hepatocellular carcinoma (HCC). Although orthotopic liver transplant offers the best chance for cure and long-term survival, the demand for organs far outweighs the supply. The incidence of HCC in the United States has increased over the past 3 decades. HCV-induced cirrhosis is believed to play a significant role in the rising rate of HCC. Therefore, primary measures to prevent HCC in HCV-infected patients are urgently needed. Numerous studies of the HCV HCC patient have considered primary treatment with interferon-based therapy. However, secondary prevention currently seems to carry more promise. This article evaluates and assesses various treatments for primary and secondary chemoprevention in the setting of HCV.

When data become people: archaeological ethics, reburial, and the past as public heritage

1998 ◽  
Vol 7 (1) ◽  
pp. 69-86 ◽  
Author(s):  
LJ Zimmermann
Keyword(s):  
United States ◽  
Native Americans ◽  
The United States ◽  
American Archaeology ◽  
Archaeological Ethics ◽  
The Past ◽  
Scientific Approach ◽  
Ethics Code

In the United States, consideration of archaeological ethics has been relatively recent and concerned primarily with defining professionalism. By declaring that the past is a public heritage, claiming that archaeologists should be its stewards, and moving toward a positivist scientific approach, American archaeology has alienated its public. Prompted by pressure from Native Americans on the reburial issue, the Society for American Archaeology has attempted to address the problems by proposing an ethics code, but outsiders are likely to see the contradictions between stated principles and practice. These issues are examined from the perspective of the reburial issues, offering the possibility that an ethnocritical archaeology might provide mechanisms that will allow archaeologists to be more truly accountable and, in the long term, better stewards of the past.

scholarly journals Air pollution and COVID-19 mortality in the United States: Strengths and limitations of an ecological regression analysis

2020 ◽  
Vol 6 (45) ◽  
pp. eabd4049 ◽  
Author(s):  
X. Wu ◽  
R. C. Nethery ◽  
M. B. Sabath ◽  
D. Braun ◽  
F. Dominici
Keyword(s):  
United States ◽  
Air Pollution ◽  
Regression Analysis ◽  
The United States ◽  
Outcome Data ◽  
Data Availability ◽  
Future Research ◽  
Individual Level ◽  
Ecological Regression

Assessing whether long-term exposure to air pollution increases the severity of COVID-19 health outcomes, including death, is an important public health objective. Limitations in COVID-19 data availability and quality remain obstacles to conducting conclusive studies on this topic. At present, publicly available COVID-19 outcome data for representative populations are available only as area-level counts. Therefore, studies of long-term exposure to air pollution and COVID-19 outcomes using these data must use an ecological regression analysis, which precludes controlling for individual-level COVID-19 risk factors. We describe these challenges in the context of one of the first preliminary investigations of this question in the United States, where we found that higher historical PM2.5 exposures are positively associated with higher county-level COVID-19 mortality rates after accounting for many area-level confounders. Motivated by this study, we lay the groundwork for future research on this important topic, describe the challenges, and outline promising directions and opportunities.

scholarly journals Illusions of Autonomy: Why Europe Cannot Provide for Its Security If the United States Pulls Back

2021 ◽  
Vol 45 (4) ◽  
pp. 7-43
Author(s):  
Hugo Meijer ◽  
Stephen G. Brooks
Keyword(s):  
United States ◽  
The United States ◽  
National Defense ◽  
Policy Issues ◽  
Threat Perceptions ◽  
The Past ◽  
Future State ◽  
Strategic Autonomy ◽  
The U.S

Abstract Europe's security landscape has changed dramatically in the past decade amid Russia's resurgence, mounting doubts about the long-term reliability of the U.S. security commitment, and Europe's growing aspiration for strategic autonomy. This changed security landscape raises an important counterfactual question: Could Europeans develop an autonomous defense capacity if the United States withdrew completely from Europe? The answer to this question has major implications for a range of policy issues and for the ongoing U.S. grand strategy debate in light of the prominent argument by U.S. “restraint” scholars that Europe can easily defend itself. Addressing this question requires an examination of the historical evolution as well as the current and likely future state of European interests and defense capacity. It shows that any European effort to achieve strategic autonomy would be fundamentally hampered by two mutually reinforcing constraints: “strategic cacophony,” namely profound, continent-wide divergences across all domains of national defense policies—most notably, threat perceptions; and severe military capacity shortfalls that would be very costly and time-consuming to close. As a result, Europeans are highly unlikely to develop an autonomous defense capacity anytime soon, even if the United States were to fully withdraw from the continent.

scholarly journals The long-term trend and production sensitivity change in the US ozone pollution from observations and model simulations

2020 ◽  
Vol 20 (5) ◽  
pp. 3191-3208 ◽  
Author(s):  
Hao He ◽  
Xin-Zhong Liang ◽  
Chao Sun ◽  
Zhining Tao ◽  
Daniel Q. Tong
Keyword(s):  
United States ◽  
Air Quality ◽  
Surface Ozone ◽  
The United States ◽  
Early Morning ◽  
Ozone Pollution ◽  
Late Afternoon ◽  
The Past ◽  
The Us

Abstract. We investigated the ozone pollution trend and its sensitivity to key precursors from 1990 to 2015 in the United States using long-term EPA Air Quality System (AQS) observations and mesoscale simulations. The modeling system, a coupled regional climate–air quality model (CWRF-CMAQ; Climate-Weather Research Forecast and the Community Multiscale Air Quality), captured well the summer surface ozone pollution during the past decades, having a mean slope of linear regression with AQS observations of ∼0.75. While the AQS network has limited spatial coverage and measures only a few key chemical species, CWRF-CMAQ provides comprehensive simulations to enable a more rigorous study of the change in ozone pollution and chemical sensitivity. Analysis of seasonal variations and diurnal cycle of ozone observations showed that peak ozone concentrations in the summer afternoon decreased ubiquitously across the United States, up to 0.5 ppbv yr−1 in major non-attainment areas such as Los Angeles, while concentrations at certain hours such as the early morning and late afternoon increased slightly. Consistent with the AQS observations, CMAQ simulated a similar decreasing trend of peak ozone concentrations in the afternoon, up to 0.4 ppbv yr−1, and increasing ozone trends in the early morning and late afternoon. A monotonically decreasing trend (up to 0.5 ppbv yr−1) in the odd oxygen (Ox=O3+NO2) concentrations are simulated by CMAQ at all daytime hours. This result suggests that the increased ozone in the early morning and late afternoon was likely caused by reduced NO–O3 titration, driven by continuous anthropogenic NOx emission reductions in the past decades. Furthermore, the CMAQ simulations revealed a shift in chemical regimes of ozone photochemical production. From 1990 to 2015, surface ozone production in some metropolitan areas, such as Baltimore, has transited from a VOC-sensitive environment (>50 % probability) to a NOx-sensitive regime. Our results demonstrated that the long-term CWRF-CMAQ simulations can provide detailed information of the ozone chemistry evolution under a changing climate and may partially explain the US ozone pollution responses to regional and national regulations.

Exchange rates, Canadian lumber imports, and United States prices: a time-series analysis

1988 ◽  
Vol 18 (12) ◽  
pp. 1587-1594 ◽  
Author(s):  
Joseph Buongiorno ◽  
Jean-Paul Chavas ◽  
Jussi Uusivuori
Keyword(s):  
United States ◽  
Time Series ◽  
Exchange Rate ◽  
Time Series Analysis ◽  
The United States ◽  
Monthly Data ◽  
Softwood Lumber ◽  
The Past ◽  
Series Analysis

Softwood lumber imports by the United States from Canada more than doubled during the past 10 years. The objective of this paper was to investigate two possible reasons for this change: (i) the increase in value of the U.S. dollar relative to the Canadian dollar, and (ii) the rise in the price of softwood lumber in the United States. The method used was time-series analysis, leading to measures of feedback and long-term multipliers between imports, exchange rate, and U.S. price. The results, based on monthly data from January 1974 to January 1986, suggested that 68% of the rise in Canadian imports during this period was due to the rise in the price of softwood lumber in the United States. The exchange rate, however, was not found to have a significant effect on imports. The findings also indicate that the increase in imports has not led to a decline in the price received by U.S. producers.

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