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   1118篇
  免费   56篇
各国政治   61篇
工人农民   70篇
世界政治   89篇
外交国际关系   93篇
法律   589篇
中国共产党   1篇
中国政治   18篇
政治理论   252篇
综合类   1篇
  2023年   11篇
  2022年   14篇
  2021年   40篇
  2020年   43篇
  2019年   51篇
  2018年   55篇
  2017年   54篇
  2016年   56篇
  2015年   39篇
  2014年   51篇
  2013年   192篇
  2012年   53篇
  2011年   47篇
  2010年   26篇
  2009年   39篇
  2008年   35篇
  2007年   51篇
  2006年   33篇
  2005年   17篇
  2004年   28篇
  2003年   22篇
  2002年   24篇
  2001年   18篇
  2000年   20篇
  1999年   10篇
  1998年   9篇
  1997年   10篇
  1996年   14篇
  1995年   12篇
  1994年   8篇
  1993年   9篇
  1992年   12篇
  1991年   8篇
  1990年   8篇
  1989年   6篇
  1988年   7篇
  1987年   3篇
  1985年   2篇
  1984年   8篇
  1982年   3篇
  1981年   2篇
  1980年   2篇
  1979年   2篇
  1978年   4篇
  1977年   5篇
  1971年   1篇
  1970年   1篇
  1969年   3篇
  1967年   1篇
  1966年   1篇
排序方式: 共有1174条查询结果,搜索用时 31 毫秒
51.
This paper formulates a medium-term macroeconomic model of disposable income, unemployment, inflation and state spending, proposes a theory of qualitative choice to explain electoral popularity in terms of these variables and develops three approaches to the formulation of political-economic policy. The first approach is static, sets the tax rate to reconcile the interests of various pressure groups and yields a political trade-off between the private and public sector. The second approach relies on maximizing the probability of winning the next election and gives rise to a political business cycle unless the electorate votes strategically. The implications of crowding out of private investment under alternative monetary rules, autonomous behaviour of the state bureaucracy and tax-indexation for the political business cycle are also examined. The third approach analyzes the objective of maximizing the uninterrupted length in office. It yields a short-run political cycle superimposed on a longer cycle.  相似文献   
52.
53.
54.
In a double-blind placebo controlled study on psychomotor skills important for car driving (Study 1), a 75 mg dose of +/- 3,4-methylenedioxymethamphetamine (MDMA) was administered orally to 12 healthy volunteers who were known to be recreational MDMA-users. Toxicokinetic data were gathered by analysis of blood, urine, oral fluid and sweat wipes collected during the first 5h after administration. Resultant plasma concentrations varied from 21 to 295 ng/ml, with an average peak concentration of 178 ng/ml observed between 2 and 4h after administration. MDA concentrations never exceeded 20 ng/ml. Corresponding MDMA concentrations in oral fluid, as measured with a specific LC-MS/MS method (which required only 50 microl of oral fluid), generally exceeded those in plasma and peaked at an average concentration of 1215 ng/ml. A substantial intra- and inter-subject variability was observed with this matrix, and values ranged from 50 to 6982 ng/ml MDMA. Somewhat surprisingly, even 4-5h after ingestion, the MDMA levels in sweat only averaged 25 ng/wipe. In addition to this controlled study, data were collected from 19 MDMA-users who participated in a driving simulator study (Study 2), comparing sober non-drug conditions with MDMA-only and multiple drug use conditions. In this particular study, urine samples were used for general drug screening and oral fluid was collected as an alternative to blood sampling. Analysis of oral fluid samples by LC-MS/MS revealed an average MDMA/MDEA concentration of 1121 ng/ml in the MDMA-only condition, with large inter-subject variability. This was also the case in the multiple drug condition, where generally, significantly higher concentrations of MDMA, MDEA and/or amphetamine were detected in the oral fluid samples. Urine screening revealed the presence of combinations such as MDMA, MDEA, amph, cannabis, cocaine, LSD and psilocine in the multiple-drug condition.  相似文献   
55.
Self-report questionnaires are frequently used in youth research, but doubt remains whether total anonymity affects the results. This study compared the responses of 704 mainly 16–17-year-old adolescents to self-report measures of various health indicators in 2 groups: anonymous and confidential collection. For most health indicators no significant differences were found. Perceived health, use of alcohol, and aggressive behavior (for boys) were reported significantly less frequently in the confidential group (small effect size). It appeared that pupils with high scores on social desirability do not respond differently at most health indicators in the 2 conditions. For most health characteristics, epidemiologically useful outcomes may be derived from confidential self-report measures, which are also valuable for detecting individual at-risk children. Similar studies in lower grades and other types of education should confirm the results.Youth Department, Municipal Health Service Rotterdam area. Main research interests are emotional and behavioral problems of adolescents, youth health care, monitoring.Youth Department, Municipal Health Service Rotterdam area. Main research interests are emotional and behavioral problems of adolescents, youth health care, monitoring.Research Department, Municipal Health Service Rotterdam area. Major research interests include emotional and behavioral problems of adolescents, suicidal behavior, youth health care, monitoring.  相似文献   
56.
I gratefully acknowledge the comments of Jan Potters and Joep Sonnemans on an earlier version of this paper.  相似文献   
57.
Using a behavioral model of political decisionmaking, it is argued that an increasing population size and/or an increasing efficiency of production in a private enterprise economy relative to a centrally planned economy may create the conditions for a self-interested nomenklatura in a Soviet-type economy to consider a transition to a market economy. This transition may be thwarted, however, by the threat for prospective private enterpreneurs of exploitation after the change of regime. Some form of political pluralism guaranteeing sufficient political influence to private entrepreneurs appears to be required for a successful transition. The analysis shows that such a combined political and economic reform can be in the interest of the nomenklatura, thereby providing an endogenous behavioral explanation for a change of regime.  相似文献   
58.
59.

Volume Contents

Contents of Volume 19 (2000)  相似文献   
60.
The public choice literature contains little formal analysis of the bureaucratic choice of production modes — public or private — of publicly funded services. An important question to be addressed is why some governmental bodies choose to provide a publicly funded service with publicly owned and operated production units whereas other governmental bodies contract with private firms to provide the same publicly funded service. This paper is the first formal attempt to remedy this gap in the literature. We develop a theoretical explanation of the government decision maker's choice between public and private production modes based on utility maximizing behavior. We then examine empirically this choice employing logit analysis. The empirical results, which include several tests for robustness, confirm our theoretical explanation. The results are significant and suggest that non-monetary constraints are an important factor affecting this choice of production modes and that monetary constraints are less influential.  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