全文获取类型
收费全文 | 645篇 |
免费 | 27篇 |
专业分类
各国政治 | 40篇 |
工人农民 | 56篇 |
世界政治 | 141篇 |
外交国际关系 | 51篇 |
法律 | 249篇 |
中国政治 | 9篇 |
政治理论 | 125篇 |
综合类 | 1篇 |
出版年
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 2篇 |
2020年 | 16篇 |
2019年 | 17篇 |
2018年 | 34篇 |
2017年 | 31篇 |
2016年 | 19篇 |
2015年 | 16篇 |
2014年 | 25篇 |
2013年 | 82篇 |
2012年 | 27篇 |
2011年 | 22篇 |
2010年 | 22篇 |
2009年 | 17篇 |
2008年 | 30篇 |
2007年 | 33篇 |
2006年 | 14篇 |
2005年 | 30篇 |
2004年 | 28篇 |
2003年 | 25篇 |
2002年 | 23篇 |
2001年 | 16篇 |
2000年 | 16篇 |
1999年 | 11篇 |
1998年 | 8篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 7篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 8篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1987年 | 7篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1975年 | 3篇 |
1967年 | 2篇 |
1966年 | 2篇 |
1964年 | 1篇 |
排序方式: 共有672条查询结果,搜索用时 15 毫秒
621.
622.
623.
624.
625.
Ray DA Walker JA Hall A Llewellyn B Ballantyne J Christian AT Turteltaub K Batzer MA 《Forensic science international》2005,153(2-3):117-124
The inference of an individual's geographic ancestry or origin can be critical in narrowing the field of potential suspects in a criminal investigation. Most current technologies rely on single nucleotide polymorphism (SNP) genotypes to accomplish this task. However, SNPs can introduce homoplasy into an analysis since they can be identical-by-state. We introduce the use of insertion polymorphisms based on short interspersed elements (SINEs) as a potential alternative to SNPs. SINE polymorphisms are identical-by-descent, essentially homoplasy-free, and inexpensive to genotype using a variety of approaches. Herein, we present results of a blind study using 100 Alu insertion polymorphisms to infer the geographic ancestry of 18 unknown individuals from a variety of geographic locations. Using a Structure analysis of the Alu insertion polymorphism-based genotypes, we were able to correctly infer the geographic affiliation of all 18 unknown human individuals with high levels of confidence. This technique to infer the geographic affiliation of unknown human DNA samples will be a useful tool in forensic genomics. 相似文献
626.
627.
628.
629.
A simple method of detection was developed for gamma-hydroxybutyrate (GHB). The method involves the derivatization of GHB using a hexyl-chloroformate procedure in aqueous media (such as water or urine), extraction of the derivatization product directly from the sample using solid-phase microextraction, and subsequent separation and detection with gas chromatography quadrupole ion trap mass spectrometry. The deuterated form of GHB (GHB-D6) is used as an internal standard for quantitation. The method was linear for GHB-spiked pure water samples from 2 to 150 microg/mL GHB with a detection limit of 0.2 microg/mL. Spiked urine samples showed linearity from 5 to 500 microg/mL GHB with a detection limit of 2 microg/mL. The SPME-GC/MS method is applied to actual case samples, and the results are compared to those values obtained using a conventional GC/MS method. Sensitivity and linearity are comparable to those seen using traditional methods of separation, yet the SPME method is superior due to the simplicity, speed of analysis, reduction in solvent waste, and ability to differentiate between GHB and gamma-butyrolactone (GBL). 相似文献
630.
Alice Yun Chai 《Women's studies international forum》1985,8(1):59-66
In this paper I propose a Women's Studies method for an Asian American Studies curriculum by incorporating a women-centred feminist historical approach and a holistic feminist anthropological approach with American women of color's feminist politics with an emphasis on the interconnectedness of sexism, racism, classism and homophobia in the American social systems and cultural ideologies.My work is based on the belief that an Asian American Women's Studies method must be founded on a feminist politics which is specifically derived from their own definition of themselves and feminism which are based on multiple consciousness raising and multiple identities of gender, race, ethnicity, class and sexuality. 相似文献