全文获取类型
收费全文 | 8795篇 |
免费 | 287篇 |
专业分类
各国政治 | 484篇 |
工人农民 | 306篇 |
世界政治 | 768篇 |
外交国际关系 | 358篇 |
法律 | 4922篇 |
中国政治 | 47篇 |
政治理论 | 2115篇 |
综合类 | 82篇 |
出版年
2020年 | 108篇 |
2019年 | 142篇 |
2018年 | 203篇 |
2017年 | 200篇 |
2016年 | 213篇 |
2015年 | 164篇 |
2014年 | 158篇 |
2013年 | 1124篇 |
2012年 | 202篇 |
2011年 | 220篇 |
2010年 | 225篇 |
2009年 | 206篇 |
2008年 | 235篇 |
2007年 | 247篇 |
2006年 | 248篇 |
2005年 | 228篇 |
2004年 | 216篇 |
2003年 | 214篇 |
2002年 | 193篇 |
2001年 | 248篇 |
2000年 | 224篇 |
1999年 | 190篇 |
1998年 | 128篇 |
1997年 | 124篇 |
1996年 | 93篇 |
1995年 | 100篇 |
1994年 | 99篇 |
1993年 | 101篇 |
1992年 | 137篇 |
1991年 | 168篇 |
1990年 | 156篇 |
1989年 | 158篇 |
1988年 | 147篇 |
1987年 | 173篇 |
1986年 | 158篇 |
1985年 | 168篇 |
1984年 | 143篇 |
1983年 | 147篇 |
1982年 | 127篇 |
1981年 | 111篇 |
1980年 | 93篇 |
1979年 | 107篇 |
1978年 | 88篇 |
1977年 | 65篇 |
1976年 | 75篇 |
1975年 | 70篇 |
1974年 | 75篇 |
1973年 | 73篇 |
1972年 | 61篇 |
1969年 | 66篇 |
排序方式: 共有9082条查询结果,搜索用时 0 毫秒
51.
A report of an international collaborative experiment to demonstrate the uniformity obtainable using DNA profiling techniques. 总被引:2,自引:0,他引:2
P Gill S Woodroffe W B?r B Brinkmann A Carracedo B Eriksen S Jones A D Kloosterman B Ludes B Mevag 《Forensic science international》1992,53(1):29-43
This paper describes a collaborative exercise intended to demonstrate whether uniformity of DNA profile results could be achieved between different European laboratories. It was shown that this goal can be obtained provided that a common protocol is followed (specifically the use of a common electrophoretic buffer as being the most important parameter). Generally, lower molecular weight loci (with lower molecular weight fragments) such as YNH24 perform better than higher molecular weight loci such as MS43a. The results of the exercise are discussed in relation to the objectives of the European DNA profiling group (EDNAP). 相似文献
52.
N C Martin A A Pirie L V Ford C L Callaghan K McTurk D Lucy D G Scrimger 《Science & justice》2006,46(3):179-184
In the forensic science laboratory, the recovery of spermatozoa from vaginal swabs, or vaginal cells from penile swabs, can help determine if sexual intercourse may have taken place. There are several methods used to recover spermatozoa and cells from the swabs before visualisation on a microscope slide and most of these methods use water. Phosphate buffered saline (PBS) is a non-toxic solution used in many biological laboratories. Unlike water, PBS prevents cells rupturing or shrivelling up due to osmosis. This study demonstrates that PBS can be used for the extraction of spermatozoa and cells from swabs and that PBS does not affect subsequent DNA profiling. 相似文献
53.
The impact of high temperatures (24 to 39 degrees C) and low to moderately high humidities (20 to 70%) on the applicability of TLC systems for drug identification was studied during a 6 month climatologic cycle in Burkina Faso (West Africa). In general, the Rf values as observed on the plates were found to be substantially affected as compared with values obtained at temperate climates. Some TLC systems were more affected than others and the largest deviations of up to 30 Rf units were at low humidities. Tropical conditions also had a negative effect on the reproducibility of Rf values. However, when an Rf-correction procedure was applied, using reference mixtures of known drugs on each plate, accuracy as well as reproducibility of the resulting Rfc values were drastically improved and data thus corrected were found to be compatible with existing TLC data bases developed under moderate climatological conditions. The impact of high to extremely high humidities (70 to 100%) remains to be investigated. 相似文献
54.
55.
The role of the state is changing under the impact of, for example, globalization. The changes have been variously understood as the new public management (NPM), the hollowing–out of the state and the new governance. This special issue of Public Administration explores the changing role of the state in advanced industrial democracies. It focuses on the puzzle of why states respond differently to common trends.
This introductory article has three aims. First, we provide a brief review of the existing literature on public sector reform to show that our approach is distinctive. We argue that the existing literature does not explore the ways in which governmental traditions shape reform. Second, we outline an interpretive approach to the analysis of public sector reform built on the notions of beliefs, traditions, dilemmas and narratives. We provide brief illustrations of these ideas drawn from the individual country articles. Finally, we outline the ground covered by all the chapters but we do not summarize and compare their experiences of reform. That task is reserved for the concluding article. 相似文献
This introductory article has three aims. First, we provide a brief review of the existing literature on public sector reform to show that our approach is distinctive. We argue that the existing literature does not explore the ways in which governmental traditions shape reform. Second, we outline an interpretive approach to the analysis of public sector reform built on the notions of beliefs, traditions, dilemmas and narratives. We provide brief illustrations of these ideas drawn from the individual country articles. Finally, we outline the ground covered by all the chapters but we do not summarize and compare their experiences of reform. That task is reserved for the concluding article. 相似文献
56.
We consider the problem of drawing inferences within a legal framework when a person is a suspect for two separate offences. Although we are primarily concerned with scientific evidence the issue inevitably arises as to how that evidence interacts with other, non-scientific evidence. We show that, in this particular context, the evidence can be conveniently classified into three categories that concern, respectively: the first crime only; the second crime only; and evidence that relates to similarities between the two crimes. Two case examples are considered and we consider DNA, fibres and eyewitness evidence. These are viewed from the perspective of a prosecutor who has to decide whether or not to charge a suspect with one or both crimes. Graphical sensivity analyses are presented which have features that are not intuitively obvious. 相似文献
57.
Germ-line Gene Therapy: A New Stage of Debate 总被引:1,自引:0,他引:1
58.
59.
Policy Sciences - Why are some natural resource-based political conflicts so controversial, acrimonious and intractable? What factors drive these conflicts? And what turns the common political... 相似文献
60.
Eight homicidal youths were assessed for language disorders and psychiatric diagnoses using a battery of standardized language tests and the Diagnostic Interview for Children and Adolescents. Both language disorders and Diagnostic and Statistical Manual III-R psychiatric diagnoses were present in all subjects. 相似文献