首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4164篇
  免费   183篇
各国政治   232篇
工人农民   106篇
世界政治   439篇
外交国际关系   230篇
法律   1833篇
中国政治   19篇
政治理论   1449篇
综合类   39篇
  2021年   22篇
  2020年   47篇
  2019年   57篇
  2018年   97篇
  2017年   110篇
  2016年   142篇
  2015年   88篇
  2014年   80篇
  2013年   628篇
  2012年   119篇
  2011年   97篇
  2010年   114篇
  2009年   125篇
  2008年   116篇
  2007年   132篇
  2006年   131篇
  2005年   124篇
  2004年   116篇
  2003年   114篇
  2002年   116篇
  2001年   71篇
  2000年   88篇
  1999年   72篇
  1998年   97篇
  1997年   76篇
  1996年   43篇
  1995年   74篇
  1994年   66篇
  1993年   68篇
  1992年   71篇
  1991年   55篇
  1990年   54篇
  1989年   64篇
  1988年   63篇
  1987年   74篇
  1986年   61篇
  1985年   76篇
  1984年   62篇
  1983年   50篇
  1982年   54篇
  1981年   53篇
  1980年   39篇
  1979年   43篇
  1978年   37篇
  1977年   34篇
  1976年   26篇
  1975年   22篇
  1974年   23篇
  1973年   24篇
  1969年   20篇
排序方式: 共有4347条查询结果,搜索用时 46 毫秒
191.
The interaction of welfare and child support regulations has created a situation in which child support policy's incentives that discourage unwed fatherhood tend to be stronger than its incentives that encourage unwed motherhood. This suggests that more stringent child support enforcement creates incentives that reduce the likelihood of nonmarital childbearing, particularly among women with a significant chance of needing public assistance in the event of a nonmarital birth and their male partners. We investigate this hypothesis with a sample of women from the Panel Study of Income Dynamics, to which we add information on state child support enforcement. We examine childbearing behavior between the ages of 15 and 44 before marriage and during periods of non‐marriage following divorce or widowhood. The estimates indicate that women living in states with more effective child support enforcement are less likely to bear children when unmarried, especially if they are young, never‐married, or black. The findings suggest that improved child support enforcement may be a potent intervention for reducing nonmarital childbearing. © 2006 by the Association for Public Policy Analysis and Management.  相似文献   
192.
The rapidly changing political, economic, and security policies in the Soviet Union and Eastern Europe in late 1989 and 1990 have added to the complications faced by Chinese leaders since they decided to suppress the unprecedented large-scale pro-democracy demonstrations in Chinese cities in spring 1989. These changes had an obvious “ripple effect” in China, encouraging prodemocracy forces and alarming Chinese leaders. They attracted strong positive attention from the developed countries of the West and Japan, and international financial institutions and businesses. This came at the indirect expense of China. And they accelerated changes in world politics (especially in U.S.-Soviet relations) and in the politics of government decision making in the West that promised to reduce China’s relative influence in world affairs in the 1990s. The prospect of reduced influence abroad and curbed economic contacts did not appear to be sufficient cause for Beijing leaders to markedly change existing policies. Chinese leaders in mid-1990 appeared focused on issues of internal political power at a time of leadership transition. Significant changes in policy appeared most likely to await leadership changes as Deng Xiaoping and other aged leaders die or are incapacitated.  相似文献   
193.
194.
Generous Commonwealth funding before self-government in 1989 meant that the ACT enjoyed high government expenditures and low taxation compared with the states. Self-government meant a transition to normal state funding, ultimately involving substantial reductions in Commonwealth grants. Successive governments aligned taxes with other jurisdictions, but failed to reduce expenditures, which remained well above Commonwealth Grants Commission (CGC) assessments of levels necessary to provide a standard level of services. The fiscal position — however measured — has worsened. The transition to normal funding has been unsuccessful and, without the necessary adjustments, a heavy burden will be placed on future Canberrans.  相似文献   
195.
196.
197.
The following is an edited version of the proceedings of a symposium sponsored by the Middle East Policy Council on May 26, 1994, in the Hart Senate Office Building in Washington, DC. Former Senator George McGovern, President of the Council, introduced the panel; Thomas R. Mattair, the Councis Director of Research and Policy Analysis, was the organizer and moderator; Michael Collins Dunn, Senior Analyst of The International Estimate, Inc., and editor of its biweekly newsletter, The Estimate, was the discussant.  相似文献   
198.
Although there has been evidence for some time of a sex difference in depression, relatively little research has examined the developmental process by which women come to be at greater risk than men for depression. In this paper, the developmental pattern of depressed affect is examined over early and middle adolescence, with a special focus on the patterns of boys as compared to girls. In addition, a developmental model for mental health in adolescence is tested for its power in explaining the emergence of gender differences in depression. Longitudinal data on 335 adolescents randomly selected from two school districts were used to test the hypotheses. Results revealed that girls are at risk for developing depressed affect by 12th grade because they experienced more challenges in early adolescence than did boys. The sex difference in depressed affect at 12th grade disappears once early adolescent challenges are considered.This research was supported in part by grants MH30252/38142 to A. Petersen. We gratefully acknowledge the contributions of study participants and staff. Portions of this material were presented in a symposium at the 1988 meeting of the Society for Research on Adolescence, and one at the 1989 meeting of the Society for Research in Child Development.Received Ph.D. from University of Chicago in 1973. Research interest in biopsychosocial development in adolescence, with a focus on sex differences in mental health.Research interests include adolescent mental health, and parent and peer relationships.Received Ph.D. in psychology from The Pennsylvania State University. Research interests include development of affective and conduct disorders, especially sex differences in these problems.  相似文献   
199.
Conclusions To what extent do the transactions costs of implementing alternative instruments for pollution control affect the choice of the optimal instrument and the efficient intensity of control under that instrument? In a comparison of Least-Cost Regulatory Standards and Revenue-Neutral Pigouvian Taxes, it is the higher transactions costs of implementing the taxes that make Pigouvian Taxes the more costly of the two instruments. However, a more practical comparison of instruments is between Politically Feasible Standards, Marketable Discharge Permits, and Revenue-Raising Pigouvian Taxes. Here, the relationship between the transactions costs of implementation and total pollution costs are in an almost linear inverse relationship. The lower the pollution costs associated with a particular instrument, and therefore the more desirable the instrument, the higher the transactions costs of implementation. Other factors such as political distortion and welfare gains prove to be more important than the transactions costs of implementation.Assuming that variable transactions costs decrease with the optimal level of pollution for regulatory standards but increase with the optimal level for market oriented instruments, an accounting of transactions costs results in less stringent control in the case of regulatory standards and more stringent control in the case of market oriented instruments. However, the percentage effect is very small. Moreover, it is smaller in both cases if marginal pollution damage rises with the level of pollution, as it is usually presumed to do, rather than remain constant as assumed in this paper for purposes of aggregation. A major conclusion of this paper is that Pigouvian Taxes are the superior instrument for pollution control when the raising of public revenues is a desired objective. However, the various conclusions of this paper should be viewed as tentative because the data on which they are based are no longer current. Moreover, the critical estimates of transactions costs are somewhat dubious. It is hoped that new data will be collected for answering the questions raised in this paper. When this is done, a more powerful approach, one that obviates the need for the artificial, one-dollar-damaging, aggregate pollutant, would be an expanded linear programming model in which the transactions costs are treated as separate coefficients of the individual pollution control methods. Separate sets of such coefficients, each corresponding to a different policy instrument such as Least-Cost Regulatory Standards, Revenue-Neutral Pigouvian Taxes, etc., would enable the investigator to directly derive solutions that specify the optimal policy instrument as well as the optimal set of pollution control method activity levels.I am grateful to William Ascher, Murray Weidenbaum, and two anonymous referees for helpful guidance on the paper.  相似文献   
200.
To date, there has been little persuasive validation of Elazar'sconcept of political subcultures as it applies to mass publics.This study represents an attempt to establish an agenda forfuture research utilizing this popular formulation of the relationshipbetween the citizen and government. A statewide sample of 805residents of Illinois was given agree-disagree statements representingElazar's individualistic, moralistic, and traditionalistic subcultures.The data are used to explore three basic research questions:Do individuals discriminate themselves along the political subculturedimensions suggested by Elazar? Can region of residence, religion,or ethnicity be used as surrogates for individual level politicalculture? And, can political culture, measured directly at theindividual level, add significant independent explanation ofpolitical behavior and opinions beyond that of socioeconomiccharacteristics?  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号