全文获取类型
收费全文 | 1289篇 |
免费 | 34篇 |
专业分类
各国政治 | 52篇 |
工人农民 | 76篇 |
世界政治 | 114篇 |
外交国际关系 | 93篇 |
法律 | 697篇 |
中国政治 | 9篇 |
政治理论 | 274篇 |
综合类 | 8篇 |
出版年
2022年 | 9篇 |
2021年 | 7篇 |
2020年 | 39篇 |
2019年 | 32篇 |
2018年 | 44篇 |
2017年 | 37篇 |
2016年 | 32篇 |
2015年 | 39篇 |
2014年 | 35篇 |
2013年 | 162篇 |
2012年 | 37篇 |
2011年 | 35篇 |
2010年 | 40篇 |
2009年 | 38篇 |
2008年 | 29篇 |
2007年 | 21篇 |
2006年 | 38篇 |
2005年 | 41篇 |
2004年 | 47篇 |
2003年 | 35篇 |
2002年 | 20篇 |
2001年 | 67篇 |
2000年 | 55篇 |
1999年 | 56篇 |
1998年 | 32篇 |
1997年 | 15篇 |
1996年 | 10篇 |
1995年 | 13篇 |
1994年 | 13篇 |
1993年 | 17篇 |
1992年 | 18篇 |
1991年 | 11篇 |
1990年 | 22篇 |
1989年 | 18篇 |
1988年 | 19篇 |
1987年 | 11篇 |
1986年 | 11篇 |
1985年 | 12篇 |
1984年 | 13篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 8篇 |
1978年 | 10篇 |
1976年 | 5篇 |
1974年 | 4篇 |
1969年 | 4篇 |
1967年 | 5篇 |
1965年 | 3篇 |
排序方式: 共有1323条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
De Letter EA Bouche MP Van Bocxlaer JF Lambert WE Piette MH 《Forensic science international》2004,141(2-3):85-90
The amphetamine derivative 3,4-methylenedioxymethamphetamine (MDMA, "Ecstasy" is a currently used or abused designer drug and fatalities are frequently encountered in forensic practice. However, the question remains open whether an MDMA blood level can be toxic or even potentially lethal. In order to provide insight in the interpretation of a detected MDMA concentration, the distribution of MDMA and its metabolite 3,4-methylenedioxyamphetamine (MDA) in various body fluids and tissues was studied and discussed in two different fatalities. Apart from peripheral blood samples (such as femoral and subclavian blood), various blood samples obtained centrally in the human body and several body fluids (such as vitreous humour) were examined. In addition, various tissues such as cardiac muscle, lungs, liver, kidneys, and brain lobes were analysed. In contrast to the peripheral blood levels, high MDMA and MDA levels were found in cardiac blood and the majority of the organs, except for the abdominal adipose tissue. The high concentrations observed in all lung lobes, the liver and stomach contents indicate that post-mortem redistribution of MDMA and MDA into cardiac blood can occur and, as a result, blood sampled centrally in the body should be avoided. Therefore, our data confirm that peripheral blood sampling remains "the golden standard". In addition, a distinct difference in peripheral blood MDMA concentrations in our two overdose cases was established (namely 0.271 and 13.508 microg/ml, respectively). Furthermore, our results suggest that, if a peripheral blood sample is not available and when putrefaction is not too pronounced, vitreous humour and iliopsoas muscle can be valuable specimens for toxicological analysis. Finally, referring to the various mechanisms of death following amphetamine intake, which can result in different survival times (e.g. cardiopulmonary complications versus hyperthermia), the anatomo-pathological findings and the toxicological results should be considered as a whole in arriving at a conclusion. 相似文献
55.
Bart Van Looy Julie Callaert Koenraad Debackere Arnold Verbeek 《The Journal of Technology Transfer》2003,28(1):53-61
This contribution aims at examining the extent to which patent related indicators are relevant for shedding light on the notion of excellence within knowledge-generating institutions. Traditionally, excellence has been looked upon as the ability to create interesting and valuable new scientific concepts, theories and data. From such a perspective, scientific excellence can be assessed through scientometric measures of publication output and impact. The recent interest in the entrepreneurial phenomenon within knowledge-generating institutes justifies efforts to examine the relevancy of broadening the set of indicators used to assess such institutions into the direction of entrepreneurial excellence. In this paper we will examine the relevancy of using patent data in order to delineate such additional, more entrepreneurial oriented, indicators. The arguments and findings presented in this respect will lead us to a plea for the use of these indicators in a contextualized manner. 相似文献
56.
57.
The Illusion of Transparency in Negotiations 总被引:1,自引:0,他引:1
The authors examined whether negotiators are prone to an illusion of transparency, or the belief that their private thoughts and feelings are more discernible to their negotiation partners than they actually are. In Study One, negotiators who were trying to conceal their preferences thought that their preferences had leaked out more than they actually did. In Study Two, experienced negotiators who were trying to convey information about some of their preferences overestimated their partners' ability to discern them. The results of Study Three rule out the possibility that the findings are simply the result of the curse of knowledge, or the projection of one's own knowledge onto others. Discussion explores how the illusion of transparency might impede negotiators' success. 相似文献
58.
59.
60.
This study was conducted in an attempt to develop a metallographic method for the investigation of pipe bombings. Three common pipe materials, ASTM A53 steel, AISI 304L stainless steel, and 6061-T6 aluminum, were shock-loaded using five high explosives and three propellants. The explosives used were ANFO, Composition C4, C6 detasheet, nitroglycerine-based dynamite, and flake TNT. The propellants used were FFFFg black powder. Red Dot smokeless powder, and Turbo Fuel A. The post-blast microstructure, hardness, and, in the case of 304L, transformed martensite content were examined for each test. The damage done to the microstructure was found to increase with increasing detonation velocity of the explosives and increase in pressure generated by the shock-metal interaction. Material hardness and, in the case of 304L, martensite content showed a sharp increase followed by a plateau as the shock pressure and detonation velocity increased. 相似文献