全文获取类型
收费全文 | 452篇 |
免费 | 23篇 |
专业分类
各国政治 | 24篇 |
工人农民 | 16篇 |
世界政治 | 35篇 |
外交国际关系 | 30篇 |
法律 | 222篇 |
中国共产党 | 1篇 |
中国政治 | 2篇 |
政治理论 | 141篇 |
综合类 | 4篇 |
出版年
2023年 | 6篇 |
2021年 | 6篇 |
2020年 | 13篇 |
2019年 | 9篇 |
2018年 | 10篇 |
2017年 | 13篇 |
2016年 | 14篇 |
2015年 | 7篇 |
2014年 | 7篇 |
2013年 | 54篇 |
2012年 | 5篇 |
2011年 | 9篇 |
2010年 | 13篇 |
2009年 | 11篇 |
2008年 | 11篇 |
2007年 | 20篇 |
2006年 | 13篇 |
2005年 | 12篇 |
2004年 | 14篇 |
2003年 | 11篇 |
2002年 | 14篇 |
2001年 | 19篇 |
2000年 | 11篇 |
1999年 | 8篇 |
1998年 | 11篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1993年 | 8篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 10篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 7篇 |
1985年 | 10篇 |
1984年 | 6篇 |
1983年 | 6篇 |
1982年 | 4篇 |
1981年 | 6篇 |
1980年 | 9篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1967年 | 2篇 |
排序方式: 共有475条查询结果,搜索用时 31 毫秒
441.
442.
443.
444.
445.
446.
447.
448.
449.
The Monetary Value of Saving a High-Risk Youth 总被引:8,自引:0,他引:8
Mark A. Cohen 《Journal of Quantitative Criminology》1998,14(1):5-33
Programs targeted at high-risk youth are designed to prevent high-school dropout, crime, drug abuse, and other forms of delinquency. Even if shown to be successful in reducing one or more social ill, a key policy question is whether the cost to society from that intervention program exceeds its benefits. Although the costs of intervention programs are often available, the benefits are more illusive. This paper provides estimates of the potential benefits from “saving” a high-risk youth, by estimating the lifetime costs associated with the typical career criminal, drug abuser, and high-school dropout. In the absence of controlled experimental data on the number of career criminals averted, one can ask the reverse question—How many career criminals must be prevented before the program “pays for itself?” Based on a 2% discount rate, the typical career criminal causes $1.3–$1.5 million in external costs; a heavy drug user, $370,000 to $970,000; and a high-school dropout, $243,000 to $388,000. Eliminating duplication between crimes committed by individuals who are both heavy drug users and career criminals results in an overall estimate of the “monetary value of saving a high-risk youth” of $1.7 to $2.3 million. 相似文献
450.
Irwin Feller 《Journal of policy analysis and management》1987,6(3):307-327
The Cooperative Extension Service, although widely cited as an exemplary technology transfer system for its documented contributions to increases in agricultural productivity, is confronting a number of challenges. Recent presidential budgets propose a narrowing of federal responsibilities for Extension to programs related to the transfer of agricultural technology. At the same time, the relevance of its traditional organizational structure to the technical needs of contemporary agriculture has been questioned. Extension's ability simultaneously to correct what it perceives to be a narrow view of its mission as well as to improve its performance as a technology transfer system is constrained by several things. One of these is its need to provide the diverse set of services demanded by the broad constituency that comprises its political base of support. Another is the gradual change in its own internal norms towards an educational information dissemination orientation away from an emphasis on adaptive research and technical problem-solving. 相似文献