全文获取类型
收费全文 | 12586篇 |
免费 | 346篇 |
专业分类
各国政治 | 486篇 |
工人农民 | 464篇 |
世界政治 | 931篇 |
外交国际关系 | 426篇 |
法律 | 8174篇 |
中国政治 | 94篇 |
政治理论 | 2305篇 |
综合类 | 52篇 |
出版年
2020年 | 152篇 |
2019年 | 212篇 |
2018年 | 259篇 |
2017年 | 283篇 |
2016年 | 277篇 |
2015年 | 172篇 |
2014年 | 271篇 |
2013年 | 1237篇 |
2012年 | 306篇 |
2011年 | 330篇 |
2010年 | 282篇 |
2009年 | 311篇 |
2008年 | 362篇 |
2007年 | 392篇 |
2006年 | 351篇 |
2005年 | 298篇 |
2004年 | 333篇 |
2003年 | 317篇 |
2002年 | 258篇 |
2001年 | 579篇 |
2000年 | 534篇 |
1999年 | 389篇 |
1998年 | 162篇 |
1997年 | 147篇 |
1996年 | 129篇 |
1995年 | 123篇 |
1994年 | 123篇 |
1993年 | 99篇 |
1992年 | 251篇 |
1991年 | 276篇 |
1990年 | 259篇 |
1989年 | 275篇 |
1988年 | 240篇 |
1987年 | 257篇 |
1986年 | 227篇 |
1985年 | 239篇 |
1984年 | 209篇 |
1983年 | 202篇 |
1982年 | 135篇 |
1981年 | 149篇 |
1980年 | 99篇 |
1979年 | 165篇 |
1978年 | 117篇 |
1977年 | 92篇 |
1976年 | 81篇 |
1975年 | 85篇 |
1974年 | 103篇 |
1973年 | 110篇 |
1972年 | 79篇 |
1971年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
K Lalu P J Karhunen P Rautiainen 《The American journal of forensic medicine and pathology》1992,13(3):196-198
A 6-month-old girl died suddenly without any previous symptoms of heart failure. Autopsy examination showed cardiomegaly (97 g) with a severely fibrotized myocardium. The left coronary artery was originating from the pulmonary artery. Histologically, the myocardium showed myocardial infarcts of different ages, as well as grossly thickened arterial branches due to increased flow in left-right shunt. We suggest that rare anomalies of the coronary arteries should be considered in the autopsies of suspected sudden infant death syndrome cases. 相似文献
112.
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
113.
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
114.
David P. Farrington 《Journal of Experimental Criminology》2006,2(2):121-141
Following the tradition of Joan McCord's work, this paper reviews longitudinal-experimental studies in criminology with community samples of at least 100 persons, follow-up periods of at least 5 years, personal interviews, and measures of offending. The main advantages of such studies are in investigating both the natural history of development (including the effects of risk/protective factors and life events) and the impact of interventions on offending. This paper also reviews advantages and problems of prospective longitudinal surveys, randomized experiments, and longitudinal-experimental studies in criminology. Four key longitudinal-experimental studies were conducted by Joan McCord, Richard Tremblay, Lawrence Schweinhart and David Olds. Other studies have been conducted, or are currently under way, but no criminological study has yet been published with several years of personal data on participants both before and after an intervention.Joan McCord Award Lecture given at the American Society of Criminology, Toronto, Canada. 相似文献
115.
116.
The link between resource deprivation and urban violence has long been explored in criminological research. Studies, however, have largely ignored the potential for resource deprivation in particular communities to affect rates of violence in others. The relative inattention is notable because of the strong theoretical grounds to anticipate influences that extend both to geographically contiguous areas and to those that, though not contiguous, share similar social characteristics. We argue that such influences—what we term spatial and social proximity effects, respectively—constitute a central feature of community dynamics. To support this argument, we develop and test theoretically derived hypotheses about spatial and social proximity effects of resource deprivation on aggregated and disaggregated homicide counts. Our analyses indicate that local area resource deprivation contributes to violence in socially proximate communities, an effect that, in the case of instrumental homicides, is stronger when such communities are spatially proximate. We conclude by discussing the implications of our findings for theories focused on community‐level social processes and violence, and for policies aimed at reducing crime in disadvantaged areas. 相似文献
117.
U.S. Supreme Court Justice Thurgood Marshall offered his opinion regarding the utility of public opinion polls as a tool for assessing the “evolving standards of decency” regarding capital punishment. His arguments became known as the Marshall hypotheses and spawned a considerable body of empirical testing. The three Marshall hypotheses are: (1) support for capital punishment is inversely associated with knowledge about it, (2) exposure to information about capital punishment produces sentiments in opposition to capital punishment, but (3) exposure to information about capital punishment will have no impact on those who support it for retributive reasons. The results of previous tests of these hypotheses were somewhat mixed but supportive. None of these studies, however, examined the effects of change in knowledge levels with changes, if any, in death penalty attitudes and beliefs as needed for a more complete test of the Marshall hypotheses. The present study addressed this shortcoming. The results provided mixed support for these three hypotheses. That is, death penalty supporters were somewhat less informed than death penalty opponents; exposure to death penalty information and knowledge gains tended to be associated with attitudinal change in a directions suggested by these hypotheses; but, retributivists' attitudes toward and beliefs about capital punishment were not any more resistant to change than were the attitudes and beliefs of non-retributivists. 相似文献
118.
119.
Netherlands International Law Review - 相似文献
120.