全文获取类型
收费全文 | 869篇 |
免费 | 68篇 |
专业分类
各国政治 | 14篇 |
工人农民 | 5篇 |
世界政治 | 15篇 |
外交国际关系 | 68篇 |
法律 | 638篇 |
中国共产党 | 7篇 |
中国政治 | 9篇 |
政治理论 | 99篇 |
综合类 | 82篇 |
出版年
2024年 | 4篇 |
2023年 | 11篇 |
2022年 | 9篇 |
2021年 | 18篇 |
2020年 | 44篇 |
2019年 | 37篇 |
2018年 | 34篇 |
2017年 | 23篇 |
2016年 | 22篇 |
2015年 | 24篇 |
2014年 | 46篇 |
2013年 | 33篇 |
2012年 | 32篇 |
2011年 | 34篇 |
2010年 | 38篇 |
2009年 | 77篇 |
2008年 | 113篇 |
2007年 | 130篇 |
2006年 | 63篇 |
2005年 | 15篇 |
2004年 | 21篇 |
2003年 | 13篇 |
2002年 | 15篇 |
2001年 | 15篇 |
2000年 | 15篇 |
1999年 | 8篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 7篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有937条查询结果,搜索用时 31 毫秒
221.
揭示人类自然群体中D8S384基因座的基因型频率,评估D8S384基因座在法医物证中的应用价值,以及建立D8S384基因座的分型方法。用不同基因型PCR产物混合的方法,制备了D8S384等位基因分型标准物,并按照国际法医血液遗传学会DNA委员会推荐的原则命名了等位基因。采用PCR扩增、电泳分析、银染显色的方法,调查了世界3大人种11个群体1103名个体的D8S384基因型。D8S384基因座共有8个等位基因,群体内基因型分布符合Hardy-Weinberg平衡,群体间基因型构成有显著性差异。利用群体数据估计了D8S384基因座的法医学理论应用价值,计算得出D8S384基因座的期望杂合度为0.704±0.014,个人识别机率为0.864。D8S384基因座是一个较好的法医学STR遗传标记。 相似文献
222.
223.
人类D19S40基因座在不同人种中的遗传多态性研究 总被引:1,自引:0,他引:1
采用PCR技术分析中国汉族、德国人、斯洛伐克人和美国黑人群体D19S400基因座的遗传多态性及世界三大人种之间的差异。四个群体共调查了620人,发现了11个等位基因,观察到47种基因型。各群体观察杂合度为:0.78~0.88,个人识别机率为:0.93850~0.9664。四个群体基因型频率分布符合Hardy-Weinberg平衡(P>0.05),三大人种(蒙古人种、高加索人种、美国黑人)之间D19S400基因座等位基因频率分布存在极显著差异(P<0.01)。结果显示D19S400基因座在群体遗传学研究和法医学个人识别中有较高应用价值 相似文献
224.
225.
应用超薄层聚丙烯酰胺凝胶等电聚焦技术对辽宁地区200例正常人精子黄递酶Ⅲ型(DIA)的分布进行了研究。其基因频率分别为DIA_3~1=0.6850,DIA_3~2=0.2875,DIA_5~3=0.0275。由阴道液、唾液、乳汁及无精子症精液不能判定DIA_3型。室温保存精斑可检出时限为9个月。 相似文献
226.
Ricardo Jorge Dinis-Oliveira 《法庭科学研究(英文)》2021,6(3):250
This work presents an odd historical record obtained through more than 14 years of research regarding one of the first major European forensic cases. The presumed homicide of Mário Guilherme Augusto de Sampaio in 1890 was allegedly perpetrated by his uncle, the prestigious doctor Vicente Urbino de Freitas. This famous poisoning had international repercussions for decades, with the participation of several forensic experts that made the history of forensic sciences, namely forensic toxicology and pathology. This third work aims to collect, restore, and analyse all the forensic evidence, particularly from the autopsy, toxicological, and psychiatric forensic reports. Facts regarding the life of Vicente Urbino de Freitas during his exile in Brazil were also recovered, along with a vast and outstanding assortment of forensic medicine photographs from the 19th century. 相似文献
227.
We here present a study that arms the reader with various discussion points on the research and development (R&D) foreign direct investment (FDI) strategies of Chinese multinational corporations (MNCs) in Europe. Through archival research and interviews, we adopted a multi‐case study approach to investigate how significant are these investments and how relevant do they become for the local innovation systems. Our analysis shows that the establishment of R&D centers, and more importantly the evolution of these centers, does not coincide with what international business theories would have predicted. The Chinese MNCs considered entered Europe in a variety of forms, guided by various learning goals. However, we found evidence of the growing tendency of these companies to insulate themselves from local partners and to engage in less explorative and more exploitative R&D activity, adapting technologies developed elsewhere for the European market, gaining access to good indigenous labor and technologies rather than to local partnerships. 相似文献
228.
229.
Public markets, private orderings and corporate governance 总被引:1,自引:0,他引:1
In the New Property Rights approach the degree of incompleteness of markets is taken independently of the cost of the public ordering and of their efficiency relatively to private orderings. In this approach “public markets,” similarly to a Swiss cheese, are either assumed to be nonexistent empty holes (because of infinite third party verification costs) or assumed to be smooth and efficient (because of zero third party verification costs). When we allow for positive but not infinite third party verification costs we are necessarily pushed back to the insights of Commons, Coase, Fuller and Williamson. The degree of (in)completeness of public markets becomes an endogenous economic problem and managers can be seen as agents that make “second order” specific investments to run specific relations that cannot be efficiently handled by public markets. Managers and the public authorities build respectively private and public “legal equilibria” that set the working rules within which transactions can take place. Private and public legal equilibria are not only substitutes but also complements. This complementarity is an important source of the path dependency that characterizes the development of different legal systems. The framework is applied to GM’s acquisition of Fisher Body. We suggest that, contrary to the claims of the New property Rights approach, the advantages of the acquisition were not due to the superior incentives of the new private owners but should be rather related to the replacement of public markets by the new private ordering set up by Alfred Sloan. 相似文献
230.
中国成都汉族及泰国群体D7S2846基因座的遗传多态性 总被引:2,自引:0,他引:2
研究STR基因座D7S2 846的遗传多态性 ,为法科学应用提供基础数据。应用PCR及PAG电泳技术 ,对376名中国成都汉族无关个体及 131名泰国无关个体进行了调查。两群体分别检出 8个和 7个等位基因 ,首次获得该基因座基因在两群体中的频率分布。两群体基因型频率分布均符合Hardy Weinberg平衡。家系调查证实了等位基因的传递遵循孟德尔遗传规律。该基因座在两群体中的个人识别能力 (Dp)分别为 0 85 70、 0 86 0 2 ,杂合度 (H )分别为0 6 915、 0 6 870 ,多态性信息含量 (PIC)分别为 0 6 445、 0 6 5 5 3 ,非父排除率 (PE )分别为 0 415 2、 0 40 85。D7S2 846基因座在法医学个人识别及亲子鉴定中具有较高的实用价值。 相似文献