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   1568篇
  免费   88篇
各国政治   98篇
工人农民   49篇
世界政治   133篇
外交国际关系   123篇
法律   648篇
中国政治   5篇
政治理论   584篇
综合类   16篇
  2023年   12篇
  2022年   10篇
  2021年   16篇
  2020年   42篇
  2019年   51篇
  2018年   73篇
  2017年   87篇
  2016年   85篇
  2015年   43篇
  2014年   62篇
  2013年   236篇
  2012年   51篇
  2011年   53篇
  2010年   59篇
  2009年   61篇
  2008年   52篇
  2007年   49篇
  2006年   39篇
  2005年   48篇
  2004年   41篇
  2003年   40篇
  2002年   47篇
  2001年   31篇
  2000年   28篇
  1999年   28篇
  1998年   21篇
  1997年   28篇
  1996年   13篇
  1995年   16篇
  1994年   9篇
  1993年   18篇
  1992年   12篇
  1991年   11篇
  1989年   9篇
  1988年   10篇
  1987年   14篇
  1986年   10篇
  1985年   6篇
  1984年   12篇
  1983年   12篇
  1982年   10篇
  1979年   6篇
  1978年   8篇
  1975年   5篇
  1974年   6篇
  1973年   8篇
  1971年   8篇
  1970年   7篇
  1968年   6篇
  1967年   9篇
排序方式: 共有1656条查询结果,搜索用时 31 毫秒
841.
842.
843.
844.
Repeated cross‐sectional (RCS) designs are distinguishable from true panels and pooled cross‐sectional time series (PCSTS) since cross‐sectional units (e.g., individual survey respondents) appear but once in the data. This poses two serious challenges. First, as with PCSTS, autocorrelation threatens inferences. However, common solutions like differencing and using a lagged dependent variable are not possible with RCS since lags for i cannot be used. Second, although RCS designs contain information that allows both aggregate‐ and individual‐level analyses, available methods—from pooled ordinary least squares to PCSTS to time series—force researchers to choose one level of analysis. The PCSTS tool kit does not provide an appropriate solution, and we offer one here: double filtering with ARFIMA methods to account for autocorrelation in longer RCS followed by the use of multilevel modeling to estimate both aggregate‐ and individual‐level parameters simultaneously. We use Monte Carlo experiments and three applied examples to explore the advantages of our framework.  相似文献   
845.
Effects of benzodiazepines on postmortem opioid parent and parent/metabolite blood concentration ratios were determined for fentanyl‐, hydrocodone‐, methadone‐, or oxycodone‐related accidental deaths. These opioids are partially metabolized by the CYP3A4 enzyme system, which is also affected by diazepam and alprazolam. Opioid/metabolite combinations examined were as follows: fentanyl/norfentanyl, hydrocodone/dihydrocodeine, methadone/EDDP, and oxycodone/oxymorphone. Parent opioid concentrations were analyzed for 877 deaths. Parent/metabolite concentration ratios were analyzed for 349 deaths, excluding cases with co‐intoxicants present known to interfere with opioid elimination. Alprazolam in combination with diazepam significantly decreased median hydrocodone concentrations by 48% (p = 0.01) compared to hydrocodone alone. The methadone parent/metabolite concentration ratio was reduced by 35% in the presence of diazepam compared to methadone alone (p = 0.03). Benzodiazepines did not statistically significantly affect fentanyl or oxycodone concentrations. Possible factors affecting opioid concentrations and possible toxicity development, including any differential effects on specific opioids, should continue to be explored.  相似文献   
846.
Fair trade requires that developed country consumers engage in market-based transactions with developing country producers. Yet this is not market trade in any straightforward sense, because the purchase of fairly traded products brings consumers into two market relationships at the same time. One is the market relationship through which consumers buy the product itself, which enables them to act altruistically by consciously paying the price premium that the producer receives. The other is the market relationship through which consumers buy the socially reputable knowledge of having helped a distant stranger, which enables them to harness their ostensibly ethical consumption to a knowingly self-interested action. This latter relationship adds a new dimension to orthodox commodity fetishism. A Polanyian perspective is developed to investigate the way in which fair trade reworks the commodity fetish. This serves as a prelude to an extended discussion of the moral status of the behavioural motivations that underpin fair trade consumption.  相似文献   
847.
848.
Contemporary research on criminal sentencing has analyzed sentencing under numerous sentencing policies, yet the effect of sentencing policy on outcomes and disparity is not known. A variety of sentencing guidelines systems, one of the more common sentencing policies, exists throughout the country. In addition, recent Supreme Court decisions regarding sentencing guidelines are likely to produce alterations to several state sentencing policies over the next few years. Using data from the state of Florida, the current study examines the effects of policy transformation on sentencing disparity within the focal concerns of sentencing perspective. The authors view sentencing guidelines as a practical constraint on sentencing decisions that influence other key variables. The results indicate that sentencing policy transformation has an important effect on both sentencing decisions and on the factors that shape those decisions. The findings suggest that future sentencing research and theoretical development would benefit from incorporating measures of policy differences in its analyses.  相似文献   
849.
850.
This article is an examination of the issue of whether the age of electoral majority should be lowered to sixteen. We consider and reject several arguments raised by both sides of the voting age debate. The key issue, we claim, is the political maturity of young people. Drawing on empirical data collected in nationally representative surveys, we argue that the weight of such evidence suggests that young people are, to a significant degree, politically less mature than older people, and that the voting age should not be lowered to sixteen.  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