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   4755篇
  免费   166篇
各国政治   232篇
工人农民   188篇
世界政治   339篇
外交国际关系   126篇
法律   2990篇
中国共产党   1篇
中国政治   28篇
政治理论   986篇
综合类   31篇
  2020年   60篇
  2019年   68篇
  2018年   85篇
  2017年   105篇
  2016年   104篇
  2015年   94篇
  2014年   87篇
  2013年   490篇
  2012年   130篇
  2011年   121篇
  2010年   106篇
  2009年   104篇
  2008年   133篇
  2007年   129篇
  2006年   126篇
  2005年   122篇
  2004年   126篇
  2003年   121篇
  2002年   112篇
  2001年   181篇
  2000年   169篇
  1999年   129篇
  1998年   68篇
  1997年   52篇
  1996年   43篇
  1995年   56篇
  1994年   51篇
  1993年   47篇
  1992年   91篇
  1991年   89篇
  1990年   106篇
  1989年   87篇
  1988年   83篇
  1987年   83篇
  1986年   104篇
  1985年   110篇
  1984年   76篇
  1983年   78篇
  1982年   50篇
  1981年   47篇
  1980年   45篇
  1979年   49篇
  1978年   55篇
  1976年   35篇
  1975年   46篇
  1974年   61篇
  1973年   55篇
  1972年   42篇
  1970年   34篇
  1969年   41篇
排序方式: 共有4921条查询结果,搜索用时 15 毫秒
941.
942.
Book reviews     

COMPANY LAW by Mary C. Oliver, (1967), published by MacDonald & Evans Ltd,, at 12s. 6d.

A CASEBOOK ON TORT by Tony Weir, published by Sweet and Maxwell Ltd. (1967). Bound: £3.17.6d. Paperback: £2. 2. Od.

PRINCIPLES OF PUBLIC INTERNATIONAL LAW by Ian Brownlie, (1966), published by Oxford University Press, at 63/‐.

THE LAW OF CONTRACT by G. H. Treitel, Second Edition (1966) published by Stevens & Sons Ltd. Bound £3. 17. 6. Paperback £1. 18. 6,

CASEBOOK ON MERCANTILE LAW by E.R. Hardy Ivamy (1967) published by Butterworths: at 25s.

“COMMERCIAL LAW OF SCOTLAND”, by Campbell B. Burns, published by William Hodge & Company Limited, (1966), at 42/‐

BRITAIN AND EUROPE: AN INDUSTRIAL APPRAISAL, vol. 1. by the Confederation of British Industry (1966), published by C.B.I, at 10s.  相似文献   
943.
944.

Objectives

Researchers have used repeated cross sectional observations of homicide rates and sanctions to examine the deterrent effect of the adoption and implementation of death penalty statutes. The empirical literature, however, has failed to achieve consensus. A fundamental problem is that the outcomes of counterfactual policies are not observable. Hence, the data alone cannot identify the deterrent effect of capital punishment. This paper asks how research should proceed. We seek to make transparent how assumptions shape inference.

Methods

We study the identifying power of relatively weak assumptions restricting variation in treatment response across places and time. We perform empirical analysis using state-level data in the United States in 1975 and 1977.

Results

The results are findings of partial identification that bound the deterrent effect of capital punishment. Under the weakest restrictions, there is substantial ambiguity: we cannot rule out the possibility that having a death penalty statute substantially increases or decreases homicide. This ambiguity is reduced when we impose stronger assumptions, but inferences are sensitive to the maintained restrictions.

Conclusions

Imposing certain assumptions implies that adoption of a death penalty statute increases homicide, but other assumptions imply that the death penalty deters it. Thus, society at large can draw strong conclusions only if there is a consensus favoring particular assumptions. Without such a consensus, data on sanctions and murder rates cannot settle the debate about deterrence. However, data combined with weak assumptions can bound and focus the debate.  相似文献   
945.
This paper analyzed the existing literature on risk and protective factors for intimate partner violence among Hispanics using the four-level social-ecological model of prevention. Three popular search engines, PsycINFO, PubMed, and Google Scholar, were reviewed for original research articles published since the year 2000 that specifically examined factors associated with intimate partner violence (IPV) among Hispanics. Factors related to perpetration and victimization for both males and females were reviewed. Conflicting findings related to IPV risk and protective factors were noted; however, there were some key factors consistently shown to be related to violence in intimate relationships that can be targeted through prevention efforts. Future implications for ecologically-informed research, practice, and policy are discussed.  相似文献   
946.
We describe sibling proactive and reactive aggression in middle and late adolescence. Participants were 8th (n?=?303, M age?=?13.74 years, SD?=?.59) and 12th (n?=?300, M age?=?17.73 years, SD?=?.56) grade adolescents who completed an in-school survey. Findings revealed that these adolescents were significantly more likely to engage in reactive than proactive aggression with their closest-aged sibling. However, 8th grade adolescents reported greater aggression toward their closest-aged sibling than did 12th grade adolescents. In addition, sex composition of the sibling dyad moderated the association between sibling relationship quality (i.e., warmth and rivalry) and both proactive and reactive aggression indicating unique links for brother-brother and older sister-younger brother pairs.  相似文献   
947.
948.
Explanations for the incumbency advantage in American elections have typically pointed to the institutional advantages that incumbents enjoy over challengers but overlook the role of individual traits that reinforce this bias. The institutional advantages enjoyed by incumbents give voters more certainty about who incumbents are and what they might do when (and if) they assume office. We argue that these institutional advantages make incumbents particularly attractive to risk-averse individuals, who shy away from uncertainty and embrace choices that provide more certainty. Using data from 2008 and 2010 Cooperative Congressional Election Study, we show that citizens who are more risk averse are more likely to support incumbent candidates, while citizens who are more risk accepting are more likely to vote for challengers. The foundations of the incumbency advantage, we find, lie not only in the institutional perks of office but also in the individual minds of voters.  相似文献   
949.
This study examines the community‐wide effects of two statewide early childhood policy initiatives in North Carolina. One initiative provides funding to improve the quality of child care services at the county level for all children between the ages of 0 to 5, and the other provides funding for preschool slots for disadvantaged four‐year‐olds. Differences across counties in the timing of the rollout and in the magnitude of the state financial investments per child provide the variation in programs needed to estimate their effects on schooling outcomes in third grade. We find robust positive effects of each program on third‐grade test scores in both reading and math. These effects can best be explained by a combination of direct benefits for participants and spillover benefits for others. Our preferred models suggest that the combined average effects on test scores of investments in both programs at 2009 funding levels are equivalent to two to four months of instruction in grade 3.  相似文献   
950.
In order to connect the appearance of macrophages and giant cells in pulmonary tissue with the time of asphyxia the authors analyzed 50 asphyxiated human lungs paying their attention on the number of alveolar and interstitial macrophages and giant cells. They compared histological specimens of 25 asphixiated humans lungs following a slow asphyxia (30 min or more) with 25 histological specimens of asphyxiated human lungs following a rapid asphyxia (10-15 min). Alveolar and interstitial macrophages and giant cells per section, were considered and numbered. Controls were done on histological examination of traumatized lungs. In the pulmonary alveoli following on acute asphyxia there were 27.7+/-4.4 macrophages per section. Subjects dead after a slow asphyxiation showed 68.2+/-7.1 alveolar macrophages per section (p<0.001). Interstitial macrophages were also frequently present. No differences are detectable in the number of polynuclear giant cells between rapidly and slowly asphyxiated human lungs. The number of alveolar and interstitial macrophages per section can be considered as a further histological evidence of a slow asphyxia and can differentiate a slow asphyxia from an acute one.  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