全文获取类型
| 收费全文 | 5756篇 |
| 免费 | 137篇 |
专业分类
| 各国政治 | 377篇 |
| 工人农民 | 191篇 |
| 世界政治 | 592篇 |
| 外交国际关系 | 524篇 |
| 法律 | 2447篇 |
| 中国政治 | 48篇 |
| 政治理论 | 1655篇 |
| 综合类 | 59篇 |
出版年
| 2024年 | 25篇 |
| 2023年 | 45篇 |
| 2022年 | 19篇 |
| 2021年 | 43篇 |
| 2020年 | 102篇 |
| 2019年 | 128篇 |
| 2018年 | 200篇 |
| 2017年 | 198篇 |
| 2016年 | 272篇 |
| 2015年 | 157篇 |
| 2014年 | 164篇 |
| 2013年 | 882篇 |
| 2012年 | 189篇 |
| 2011年 | 180篇 |
| 2010年 | 153篇 |
| 2009年 | 157篇 |
| 2008年 | 206篇 |
| 2007年 | 241篇 |
| 2006年 | 215篇 |
| 2005年 | 194篇 |
| 2004年 | 198篇 |
| 2003年 | 169篇 |
| 2002年 | 168篇 |
| 2001年 | 113篇 |
| 2000年 | 102篇 |
| 1999年 | 112篇 |
| 1998年 | 95篇 |
| 1997年 | 93篇 |
| 1996年 | 77篇 |
| 1995年 | 65篇 |
| 1994年 | 74篇 |
| 1993年 | 79篇 |
| 1992年 | 68篇 |
| 1991年 | 63篇 |
| 1990年 | 64篇 |
| 1989年 | 54篇 |
| 1988年 | 62篇 |
| 1987年 | 40篇 |
| 1986年 | 50篇 |
| 1985年 | 41篇 |
| 1984年 | 40篇 |
| 1983年 | 33篇 |
| 1982年 | 29篇 |
| 1981年 | 31篇 |
| 1980年 | 18篇 |
| 1979年 | 20篇 |
| 1978年 | 21篇 |
| 1977年 | 16篇 |
| 1976年 | 16篇 |
| 1974年 | 34篇 |
排序方式： 共有5893条查询结果，搜索用时 0 毫秒
821.
Our study contributes to the search for the elusive catalytic effect of International Monetary Fund (IMF) lending on inflows of foreign direct investment (FDI). Recent scholarship has found that the catalytic effect is conditional on political regime and program stringency. We contribute to this literature by developing and testing a theory which describes how the catalytic effect also varies by economic sector. This is a departure from existing studies, which have tended to focus on aggregate FDI flows after crises. Our findings corroborate previous research, which finds that in general IMF lending has a substantial and negative effect on FDI. However, we find that the negative effect is concentrated in sectors that are highly dependent on external capital and have low sunk costs in the host country. Our findings are robust to several alternative explanations common in IMF literature, namely the importance of IMF program design and the ability of governments to make credible commitments to reform. Substantively, our findings suggest that investors are more likely to use IMF lending as an escape hatch in countries where FDI is dependent on external capital and has low sunk costs. 相似文献
822.
823.
Michael Leigh 《European Security》2019,28(3):382-391
ABSTRACTReflecting on the results presented in articles in this special issue, European leaders should take greater account of external perceptions in crafting the European Union's strategic narrative and guiding its actions. Failure to do so has impaired external policies like the Euro-Mediterranean Partnership, the European Neighbourhood Policy and Eastern Partnership. Leaders emerging from the Arab uprisings perceived the EU as complicit with their countries’ former anciens régimes and Russian leaders see EU support for democracy and the market economy in former Soviet states as duplicitous and instrusive. Awareness of such perceptions should be filtered into EU decision-making, without validating views that European officials and diplomats consider misleading. 相似文献
824.
This article explores the construction of extremism in media discourse, the factors driving specific constructions and the implications of these constructions for counterterrorism policy. We contend that extremism has predominantly and increasingly been framed as a security issue. This article explores the implications of this practice through the framework of securitisation. We measure the average intensity of security framing in 38,616 articles found in three major US newspapers, New York Times, Wall Street Journal and Los Angeles Times, between 20 January 1993 and 19 January 2017 comprising the Clinton, Bush and Obama presidencies, and look at factors influencing the shift in intensity over time. Through our analysis, we show that it is possible to return to a pre-9/11 discourse but that the confluence of real-world events and the strategic choices of political actors have so far prevented this from fully occurring. We then explore the effect of securitisation on public perceptions of the threat from terrorism, finding that increases in the intensity of security framing artificially increases the public’s worry about becoming a victim of terrorism. We conclude by discussing implications for the communication of counterterrorism policy and the requirements for an after, after 9/11 approach 相似文献
825.
826.
Pregabalin is a Schedule V controlled substance which is defined as the (S) enantiomer of 3‐(aminomethyl)‐5‐methylhexanoic acid. It is used legitimately to treat neuropathy in patients with diabetes as well as for epilepsy and fibromyalgia. Pregabalin is an amino acid and an amphoteric compound, which makes it difficult to analyze using the conventional GC‐MS instrumentation found in most forensic drug analysis laboratories. Problems associated with the traditional GC‐MS analysis of pregabalin include selective solubility, ring closure to the corresponding lactam in the GC injection port and/or the MS transfer line and difficulty with chiral derivatization due to the presence of a carboxylic acid moiety. Here, we show that these challenges can be overcome by methylating (capping) the carboxylic acid portion of the pregabalin molecule and converting to the corresponding methyl ester. Once the methyl ester is synthesized, chiral derivatization at the amine can be achieved to identify the controlled (S) enantiomer of pregabalin via GC‐MS. 相似文献
827.
Cocaine is an illicit drug frequently encountered by forensic practitioners in driving under the influence of drugs (DUID) casework. Whole blood collected from a suspected drugged driver was found to contain 3.000 mg/L cocaine, 1.600 mg/L benzoylecgonine, and 0.260 mg/L methamphetamine. The high concentration of cocaine, while common in overdose death investigations, is unusual for an impaired driving case. Information from the officer revealed that the motorist swallowed cocaine during the traffic stop. Although a cocaine DUID charge could not be pursued, the blood methamphetamine concentration exceeded the State of Nevada “per se” limit for operating a motor vehicle. The motorist was successfully prosecuted for DUID based on his admission of using methamphetamine prior to driving and the blood methamphetamine result. This case highlights the importance of considering case history when interpreting laboratory results and the application of jurisdictional statutes as an approach to prosecuting suspected drug‐impaired drivers. 相似文献
828.
Shane Darke Ph.D. Johan Duflou M.Med.Path. F.R.C.P.A. Sharlene Kaye Ph.D. Michael Farrell F.R.C.P. F.R.C.Psych. 《Journal of forensic sciences》2019,64(5):1421-1426
Psychostimulant use is associated with increased stroke risk. To determine the proportion of psychostimulant users among fatal strokes in young adults (15–44 years), all cases were retrieved from the National Coronial Information System (1/1/2009–31/12/2016). A total of 279 cases were identified: hemorrhagic (259), ischemic (8), thrombotic (8), and mycotic (4). Fifty (17.9%) were identified as psychostimulant users. Psychostimulants in blood were detected in 37/45 where toxicology was available, predominantly methamphetamine (32/45). Hemorrhagic strokes in the psychostimulant group were more likely to be intraparenchymal (OR 2.33). Psychostimulant users were less likely to be obese (OR 0.31), but more likely to have a history of tobacco use (OR 2.64). No psychostimulant user had a previous stroke history, was gravid/postpartum, or diagnosed with cerebral vasculitis or endocarditis. The work illustrates the substantial role of psychostimulant use in fatal strokes among young adults. In cases of hemorrhagic stroke among young adults, psychostimulant use should be considered. 相似文献
829.
830.