全文获取类型
收费全文 | 4039篇 |
免费 | 134篇 |
专业分类
各国政治 | 140篇 |
工人农民 | 144篇 |
世界政治 | 266篇 |
外交国际关系 | 126篇 |
法律 | 2776篇 |
中国政治 | 38篇 |
政治理论 | 668篇 |
综合类 | 15篇 |
出版年
2021年 | 29篇 |
2020年 | 54篇 |
2019年 | 57篇 |
2018年 | 81篇 |
2017年 | 95篇 |
2016年 | 87篇 |
2015年 | 72篇 |
2014年 | 80篇 |
2013年 | 312篇 |
2012年 | 92篇 |
2011年 | 117篇 |
2010年 | 85篇 |
2009年 | 97篇 |
2008年 | 115篇 |
2007年 | 91篇 |
2006年 | 114篇 |
2005年 | 93篇 |
2004年 | 102篇 |
2003年 | 103篇 |
2002年 | 100篇 |
2001年 | 193篇 |
2000年 | 139篇 |
1999年 | 110篇 |
1998年 | 40篇 |
1997年 | 52篇 |
1996年 | 42篇 |
1995年 | 52篇 |
1994年 | 45篇 |
1993年 | 57篇 |
1992年 | 83篇 |
1991年 | 89篇 |
1990年 | 82篇 |
1989年 | 66篇 |
1988年 | 90篇 |
1987年 | 84篇 |
1986年 | 98篇 |
1985年 | 112篇 |
1984年 | 89篇 |
1983年 | 85篇 |
1982年 | 45篇 |
1981年 | 40篇 |
1979年 | 38篇 |
1978年 | 36篇 |
1977年 | 27篇 |
1975年 | 35篇 |
1974年 | 50篇 |
1972年 | 27篇 |
1971年 | 31篇 |
1970年 | 31篇 |
1968年 | 32篇 |
排序方式: 共有4173条查询结果,搜索用时 15 毫秒
961.
J.J. Builes N. Alzate C. Espinal L. Gusmão 《Forensic Science International: Genetics Supplement Series》2008,1(1):184-186
We studied and established a database and some parameters of forensic importance were calculated of 16 Y-STR (DYS19, DYS385, DYS389I/II, DYS390, DYS391, DYS392, DYS393, DYS437, DYS438, DYS439, DYS460, DYS461, GATA-A10, GATA-H4 and DYS635) in a population of 298 unrelated males of African descent of Chocó (Colombia) and a total of 257 haplotypes were identified using the present set of Y-STR markers, of which 224 were represented only once in the database. Twenty-six haplotypes were presents two times, six haplotypes were presents in three individuals and one haplotype in four men. The haplotype diversity was 0.9987 ± 0.0004. By combining the allelic states of the 16 Y-chromosomal STRs we could construct highly informative haplotypes that allowed the discrimination of 86.2% of the samples tested. With this work we established a database of Y-STR and some parameters of forensic importance. This approach represents a very powerful tool for individual identification and paternity testing in forensic genetic. 相似文献
962.
963.
一、引言
在过去的十年里,“军事事务变革”的观念引起了军事思想家们的注意,“不对称”已成为当前的流行用语。但是,不对称很难表示一种本质上新的行动模式,因为在战争的某些特性方面, 相似文献
964.
965.
966.
967.
968.
K.N. Ballantyne R.A. van Oorschot 《Forensic Science International: Genetics Supplement Series》2008,1(1):7-8
Development and validation of new methods and technologies frequently require long periods of time and high costs to determine the optimal system. A commonly used approach to optimisation is the factorial method, where each variable is tested at every level of the other variables. An alternative approach is to modify the experimental design using a multifactorial approach. The Taguchi design method utilises orthogonal arrays, which distribute the variables in a balanced manner, thus greatly reducing the number of experiments required. We applied the Taguchi experimental design method to PCR optimisation, and significantly reduced the number of reactions required to create highly successful reactions. We found the Taguchi design method a valuable tool for the optimisation of multifactor experiments. 相似文献
969.
Previous research has shown that many forms of strain are positively related to delinquency. Evidence also suggests that religiosity buffers the effects of strain on offending, but this issue requires further research. Using data from a national sample of adolescents, this study examined whether or not religiosity conditioned the relationship between strain and delinquency. This study also looked at the ability of social support, self-esteem, and depression to moderate the influence of strain on delinquent behavior. The findings here lend support to general strain theory in that strain had a direct positive effect on delinquency, yet there was little evidence that the relationship was moderated by religiosity or other conditioning variables. The roles of moderating variables on strain across genders were also considered. 相似文献
970.
OLG Nürnberg 《Natur und Recht》2008,30(9):670-672
Ohne Zusammenfassung 相似文献