Foreign-Born Emigration From The United States: 1960 To 1970

This paper presents estimates of emigration of foreign-born persons by age and sex for 1960 to 1970, based on 1960 and 1970 census counts of the foreign-born population, adjusted life table survival rates, and annual statistics on alien immigration published by the Immigration and Naturalization Service. The effects of nativity bias are discussed. It is estimated that approximately 1,140,000 foreign-born persons emigrated between 1960 and 1970, of which 663,000, or 58 percent, were women and 477,000 were men. Almost one-quarter of the foreign-born emigrants were women 25–44 years of age in 1970. About 175,000 foreign-born persons 65 years and over in 1970 emigrated during the decade. The most significant finding, that more than one million foreign-born persons left the United States between 1960 and 1970, has important implications for U.S. immigration policy and for net immigration data used to estimate the population of the United States.     

《苏联经济学评论》导言

以<苏联经济学评论>为题汇集起来的毛泽东的这些文章,主要形成于大跃进运动期间和其后的一段时间.从以下几个密切联系的方面去读<苏联经济学评论>是很有益处的:第一,它是毛泽东对苏联模式的内容及其对中国的意义所做的一个关键性的初步总结.第二,它是从不断革命的角度对大跃进运动所作的强有力的辩护.第三,它是对苏联政治经济学原理和俄国革命经验的几个要点,特别是斯大林统治时期,所做的开拓性的检视.     

Managing Uncertainty: The Tropospheric Ozone Challenge

Although it has been over two decades since Congress passed the Clean Air Act of 1968, ozone in the lower atmosphere remains a serious environmental concern in the United States. Significant scientific progress has been made over the past three decades, yet many important uncertainties remain unresolved. How to manage in a situation characterized by these uncertainties is a major challenge that must be overcome to develop an effective ozone abatement strategy. In this paper, we describe a decision framework for evaluation of alternative ozone abatement strategies. The framework, which embodies two major components-a simulation module and a decision module–incorporates uncertainty in a dynamic decision-making process and enables evaluation of NOx and VOC controls on a systematic basis. We demonstrate the application of the framework through an illustrative analysis to provide insight into the value of flexible ozone abatement strategies in reducing the total cost of achieving air-quality goals and the tradeoffs between the timing and the accuracy of additional information.