全文获取类型
收费全文 | 619篇 |
免费 | 20篇 |
专业分类
各国政治 | 41篇 |
工人农民 | 24篇 |
世界政治 | 38篇 |
外交国际关系 | 30篇 |
法律 | 338篇 |
中国政治 | 2篇 |
政治理论 | 163篇 |
综合类 | 3篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 9篇 |
2019年 | 12篇 |
2018年 | 16篇 |
2017年 | 20篇 |
2016年 | 21篇 |
2015年 | 17篇 |
2014年 | 29篇 |
2013年 | 85篇 |
2012年 | 19篇 |
2011年 | 22篇 |
2010年 | 22篇 |
2009年 | 19篇 |
2008年 | 26篇 |
2007年 | 29篇 |
2006年 | 18篇 |
2005年 | 23篇 |
2004年 | 16篇 |
2003年 | 28篇 |
2002年 | 18篇 |
2001年 | 13篇 |
2000年 | 23篇 |
1999年 | 8篇 |
1998年 | 10篇 |
1997年 | 9篇 |
1996年 | 9篇 |
1994年 | 7篇 |
1993年 | 7篇 |
1992年 | 3篇 |
1991年 | 7篇 |
1990年 | 10篇 |
1989年 | 9篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1974年 | 3篇 |
1973年 | 3篇 |
1970年 | 2篇 |
1963年 | 3篇 |
排序方式: 共有639条查询结果,搜索用时 31 毫秒
61.
62.
63.
64.
65.
66.
67.
68.
The long-term administration of clozapine could be verified by fine segmentation and analysis of single hairs of one person to examine the history of a multiple poisoning case. Segments of 1-2.5mm length were extracted by ultrasonification in 30 microl of the mobile phase (mixture of methanol+water, 50+50). By application of isocratic liquid chromatography and using narrow bore columns (Synergy Polar-RP, Phenomenex), an acceleration and miniaturization of the HPLC-MS-MS assay could be achieved. Total amounts of clozapine down to 30 fg (on column) and its desmethyl metabolite could be analysed in multiple reaction monitoring mode. According to typical sample amounts of approximately 16 microg, relevant hair concentrations higher than 1 pg/mg were detected. Significant and reproducible concentration profiles along the hair fibres revealed characteristic administration cycles. The administration time course - in particular the time of its termination - could be verified with a precision of a few days. The accuracy and reproducibility of the concentration profile was proven based on multiple investigations of single hairs. An individual hair growth rate of 0.55 mm/day was determined with a relative standard deviation of 8% by comparison of concentration profiles in hairs collected after a time span of 165 days. 相似文献
69.
Mandatory data breach notification laws have been a significant legislative reform in response to unauthorized disclosures of personal information by public and private sector organizations. These laws originated in the state-based legislatures of the United States during the last decade and have subsequently garnered worldwide legislative interest. We contend that there are conceptual and practical concerns regarding mandatory data breach notification laws which limit the scope of their applicability, particularly in relation to existing information privacy law regimes. We outline these concerns here, in the light of recent European Union and Australian legal developments in this area. 相似文献
70.