全文获取类型
收费全文 | 23270篇 |
免费 | 531篇 |
专业分类
各国政治 | 967篇 |
工人农民 | 1527篇 |
世界政治 | 1440篇 |
外交国际关系 | 953篇 |
法律 | 13145篇 |
中国政治 | 112篇 |
政治理论 | 5510篇 |
综合类 | 147篇 |
出版年
2021年 | 87篇 |
2020年 | 180篇 |
2019年 | 264篇 |
2018年 | 1558篇 |
2017年 | 1514篇 |
2016年 | 1386篇 |
2015年 | 346篇 |
2014年 | 347篇 |
2013年 | 1814篇 |
2012年 | 548篇 |
2011年 | 1263篇 |
2010年 | 1291篇 |
2009年 | 933篇 |
2008年 | 1133篇 |
2007年 | 1138篇 |
2006年 | 461篇 |
2005年 | 473篇 |
2004年 | 570篇 |
2003年 | 528篇 |
2002年 | 414篇 |
2001年 | 523篇 |
2000年 | 465篇 |
1999年 | 393篇 |
1998年 | 246篇 |
1997年 | 220篇 |
1996年 | 221篇 |
1995年 | 220篇 |
1994年 | 221篇 |
1993年 | 210篇 |
1992年 | 294篇 |
1991年 | 308篇 |
1990年 | 298篇 |
1989年 | 293篇 |
1988年 | 287篇 |
1987年 | 258篇 |
1986年 | 308篇 |
1985年 | 291篇 |
1984年 | 271篇 |
1983年 | 248篇 |
1982年 | 182篇 |
1981年 | 156篇 |
1980年 | 129篇 |
1979年 | 173篇 |
1978年 | 112篇 |
1977年 | 131篇 |
1976年 | 109篇 |
1975年 | 86篇 |
1974年 | 115篇 |
1973年 | 91篇 |
1972年 | 85篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
151.
The impact of high temperatures (24 to 39 degrees C) and low to moderately high humidities (20 to 70%) on the applicability of TLC systems for drug identification was studied during a 6 month climatologic cycle in Burkina Faso (West Africa). In general, the Rf values as observed on the plates were found to be substantially affected as compared with values obtained at temperate climates. Some TLC systems were more affected than others and the largest deviations of up to 30 Rf units were at low humidities. Tropical conditions also had a negative effect on the reproducibility of Rf values. However, when an Rf-correction procedure was applied, using reference mixtures of known drugs on each plate, accuracy as well as reproducibility of the resulting Rfc values were drastically improved and data thus corrected were found to be compatible with existing TLC data bases developed under moderate climatological conditions. The impact of high to extremely high humidities (70 to 100%) remains to be investigated. 相似文献
152.
Veto Players and Civil War Duration 总被引:1,自引:0,他引:1
David E. Cunningham 《American journal of political science》2006,50(4):875-892
Civil wars show a remarkable variation in how long they last. Some end within days; others continue for decades. What explains the extreme intractability of some wars while others are resolved quickly? This article argues that conflicts with multiple actors who must approve a settlement (veto players) are longer because there are fewer acceptable agreements, information asymmetries are more acute, and shifting alliances and incentives to hold out make negotiation more difficult. This veto player approach to explaining variation in civil war duration is tested using a new dataset containing monthly data on all parties to each civil war begun since World War II. The statistical analysis shows a strong correlation between the number of veto players and the duration of civil war. 相似文献
153.
K. Michael Reynolds Pamala L. Griset Ernest Scott 《American Journal of Criminal Justice》2006,31(1):1-17
Many attempts have been made over the last several decades to improve communication among law enforcement agencies. This article
is a case study of a “low-level” data sharing project in Florida that could serve as a national model. The Florida Law Enforcement
Data Sharing Consortium is a partnership between the University of Central Florida and more than one hundred law enforcement
agencies. It offers an inexpensive, yet technically advanced alternative to the proprietary data sharing model. Its distributed
architecture was endorsed by the Markle Foundation, the 9/11 Commission, and the 2004 National Security Act. Civil liberties
concerns raised by this and other types of data sharing projects are discussed. 相似文献
154.
In this study, a new method was developed for the impurity profiling of illicit MDMA tablets. The extraction efficiency, linearity, repeatability and reproducibility of the method were evaluated. Eighty two MDMA tablets coming from presumed unrelated large seizures in 2004 (n >500 tablets) were analyzed by gas chromatography mass spectrometry (GC-MS) in order to assess the discrimination power of the method. The latter was found to be practical, robust, relatively easy to perform, highly discriminative and yielding good chromatography. In addition, some new impurities were detected and identified. Their chemical structures and mass spectra are reported. 相似文献
155.
The role of the state is changing under the impact of, for example, globalization. The changes have been variously understood as the new public management (NPM), the hollowing–out of the state and the new governance. This special issue of Public Administration explores the changing role of the state in advanced industrial democracies. It focuses on the puzzle of why states respond differently to common trends.
This introductory article has three aims. First, we provide a brief review of the existing literature on public sector reform to show that our approach is distinctive. We argue that the existing literature does not explore the ways in which governmental traditions shape reform. Second, we outline an interpretive approach to the analysis of public sector reform built on the notions of beliefs, traditions, dilemmas and narratives. We provide brief illustrations of these ideas drawn from the individual country articles. Finally, we outline the ground covered by all the chapters but we do not summarize and compare their experiences of reform. That task is reserved for the concluding article. 相似文献
This introductory article has three aims. First, we provide a brief review of the existing literature on public sector reform to show that our approach is distinctive. We argue that the existing literature does not explore the ways in which governmental traditions shape reform. Second, we outline an interpretive approach to the analysis of public sector reform built on the notions of beliefs, traditions, dilemmas and narratives. We provide brief illustrations of these ideas drawn from the individual country articles. Finally, we outline the ground covered by all the chapters but we do not summarize and compare their experiences of reform. That task is reserved for the concluding article. 相似文献
156.
Out of Harm's Way?: Illicit Drug Use, Medicalization and the Law 总被引:1,自引:0,他引:1
157.
This synoptic article focuses on the origin and functioning of the Office of the Family Advocate as the protector of the interests of minor children in divorce cases. Attention is paid to the general contemporary trend to specialise in judicial decision-making that developed out of an increasing need for expertise in the administration of justice. A number of arguments for and against judicial specialisation are addressed. The origin of the Office of the Family Advocate within the South African judicial system is discussed and a brief exposition of the history of divorce legislation in South Africa is given. This is followed by attention to the functioning of the Office of the Family Advocate with reference to the process followed in investigations of this office and points of criticism against the system are highlighted. The article closes with an indication of the need for research in this regard and possible focus points for future research are identified. 相似文献
158.
C. Haedrich C. Ortmann O.R. Hofmann J. Seilwinder A. Klein 《Forensic Science International Supplement Series》2006,160(2-3):173-177
In a case of suicidal application of electricity differences between the rectal temperature of the body and the suspected time of death were observed.In order to answer the question whether an electric current from hand to hand over >30 min led to a rise in body temperature FEM-based computer simulations and animal experiments were carried out. Both resulted in a warming of the soft parts in the arm without warming the body core. Thus a temperature-based estimation of the time since death can also be used in cases with electricity as the cause of death. Besides, in the animal experiment we found a spontaneous rise in the body core temperature even without application of electricity which may be a reason for the typical temperature plateau after death. 相似文献
159.
Stephen Kershnar 《Law and Philosophy》2007,26(5):437-463
In two recent cases, Grutter v. Bollinger, 539 U.S. 306. (2003) and Gratz v. Bollinger, 539 U.S. 244. (2003), the Supreme
Court held that the Equal Protection Clause permitted state schools to use race-sensitive admissions in order to obtain the
educational benefits that flow from a diverse student body. The diversity-based argument for race-sensitive admissions, scholarships,
awards, and other opportunities at universities should have been rejected because it does not consider the full range of costs
and benefits and because the more narrow educational effects probably weigh against such programs. However, this does not
suggest that applicants’ race, ethnicity, and gender should be ignored. Rather the same consideration that led to the defeat
of the diversity argument, i.e., reasoning capacity, supports the consideration of demographic factors. However, attention
to such factors further undermines the consequentialist case for affirmative action. 相似文献
160.