全文获取类型
收费全文 | 403篇 |
免费 | 27篇 |
出版年
2023年 | 8篇 |
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 9篇 |
2019年 | 20篇 |
2018年 | 23篇 |
2017年 | 32篇 |
2016年 | 21篇 |
2015年 | 17篇 |
2014年 | 25篇 |
2013年 | 94篇 |
2012年 | 18篇 |
2011年 | 22篇 |
2010年 | 10篇 |
2009年 | 11篇 |
2008年 | 7篇 |
2007年 | 2篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 8篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 8篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1990年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1966年 | 1篇 |
1964年 | 2篇 |
1960年 | 3篇 |
1959年 | 1篇 |
1950年 | 1篇 |
排序方式: 共有430条查询结果,搜索用时 234 毫秒
411.
412.
Problems of sampling carbonized plant material are discussed. Firstly, the problem of actually selecting a sample in the laboratory is considered, and some experiments which investigate various procedures are described. Secondly, the statistical aspects of determining optimal sample sizes are considered. Formulae are given for calculating optimal sample sizes and confidence intervals. Upper bounds, which are independent of the total population size, are provided for the sample size required to achieve any desired accuracy. 相似文献
413.
414.
Lorraine van Blerk 《Children's Geographies》2019,17(1):32-35
ABSTRACTThis viewpoints paper reflects upon the journey youth geographies have travelled over the last 20 years and highlights some thoughts on where directions for new research might be best placed in the coming decades. In particular, the paper draws attention to the growing numbers of youth in the Global South and especially in the African continent where youth populations are set to continue to rise. The paper identifies some of the potential challenges faced by the majority of youth in coming years in particular the need to decolonise thinking around youth geographies while also considering the importance of economic, social and political contexts in shaping debates. The paper charts some potential new directions while also suggesting that youth’s own perspectives need to receive greater prominence in theory and outcomes. 相似文献
415.
416.
417.
ABSTRACT This paper studies the complexities of film financing in Europe, and the role of territorial licences and public support schemes therein. It sets out a typology of support mechanisms and provides information on Member States’ and EU models of film financing. 相似文献
418.
419.
Drawing on ethnographic work in Ghana and Bangladesh, and on a British dystopian novel, we sketch the social, emotional, and existential consequences of childlessness for women who desperately want a child, as is still common in the two countries where the authors carried out research. For these women, childlessness leads to loneliness and a sense of uselessness. Underlying these emotions is the notion that children constitute and personify continuity; childlessness thus stands for the discontinuation of life. 相似文献
420.
Annemieke van den Dool 《政策研究杂志》2023,51(2):327-349
In response to calls to apply the multiple streams framework to nondemocracies, this article adapts the framework to an authoritarian context and applies it to a case study of live poultry sales in food markets in China, a key issue in epidemic prevention. Using a dataset consisting of Chinese policy documents, Chinese news articles, World Health Organization data, and secondary literature, the study shows that despite the public health threat posed by live poultry sales and despite high-level political support, a national-level permanent ban has not been adopted because it is technically infeasible, financially inviable, and inconsistent with existing norms and values. The study suggests that—despite the country's top-down governance style and lack of political pluralism—policy preferences expressed by members of the policy-making elite are not necessarily adopted in authoritarian China. Future research should test the proposed hypotheses in other policy areas and other authoritarian contexts. 相似文献