全文获取类型
收费全文 | 456篇 |
免费 | 26篇 |
出版年
2023年 | 6篇 |
2020年 | 20篇 |
2019年 | 17篇 |
2018年 | 18篇 |
2017年 | 24篇 |
2016年 | 25篇 |
2015年 | 17篇 |
2014年 | 18篇 |
2013年 | 123篇 |
2012年 | 13篇 |
2011年 | 16篇 |
2010年 | 15篇 |
2009年 | 9篇 |
2008年 | 8篇 |
2007年 | 13篇 |
2006年 | 8篇 |
2005年 | 10篇 |
2004年 | 7篇 |
2002年 | 3篇 |
2001年 | 6篇 |
2000年 | 5篇 |
1999年 | 9篇 |
1998年 | 8篇 |
1997年 | 9篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1993年 | 6篇 |
1992年 | 9篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1973年 | 3篇 |
1967年 | 2篇 |
1964年 | 1篇 |
1960年 | 1篇 |
1959年 | 1篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1955年 | 2篇 |
1953年 | 1篇 |
1951年 | 2篇 |
排序方式: 共有482条查询结果,搜索用时 15 毫秒
11.
12.
13.
First Insights into the Technique Used for Heat Treatment of Chert at the Solutrean Site of Laugerie‐Haute,France 下载免费PDF全文
The earliest evidence of flint and chert heat treatment was found in the ~21.5–17 ka old European Solutrean culture. The appearance of pyrotechnology as part of the production of stone tools has important implications for our understanding of Upper Palaeolithic technological evolution and the specific adaptations during the last glacial maximum in Europe. However, the techniques and procedures used to heat‐treat rocks during the Solutrean remain poorly understood. No direct archaeological evidence has so far been found and the most promising approach is to understand these techniques by determining the parameters with which flint and chert were heated at that time. In this study, we investigate the heating temperature of 44 heat‐treated laurel‐leaf points from Laugerie‐Haute, using a non‐destructive technique based on infrared spectroscopy. Our results document that most of the artefacts were heated to a narrow interval of temperatures between 250 °C and 300 °C. This indicates a standardized technique that allowed to created similar conditions during successive heating cycles. The implications of these results for our understanding of the technical complexity during the Solutrean must be discussed in the light of different heating techniques used at different places and periods. 相似文献
14.
15.
Alexander Maxwell 《Central Europe》2018,16(1):29-50
During the nineteenth century, nationalists in Wales and Slovakia attempted to promote national goals by attempting to persuade English and Hungarian leaders to freely grant collective rights to the ‘subordinate’ nation. This strategy of ‘supplicant’ nationalism included effusive declarations of loyalty to the common state, exaggerated claims to moral superiority, and flattering comments about the ‘dominant’ nation. Supplicant nationalism closely resembles what Will Kymlicka called the struggle for ‘polyethnic rights’, but can still be seen as a form of nationalism. 相似文献
16.
Steffen Ganghof Sebastian Eppner Alexander Pörschke 《Australian journal of political science》2018,53(2):211-233
The article analyses the type of bicameralism we find in Australia as a distinct executive-legislative system – a hybrid between parliamentary and presidential government – which we call ‘semi-parliamentary government’. We argue that this hybrid presents an important and underappreciated alternative to pure parliamentary government as well as presidential forms of the power-separation, and that it can achieve a certain balance between competing models or visions of democracy. We specify theoretically how the semi-parliamentary separation of powers contributes to the balancing of democratic visions and propose a conceptual framework for comparing democratic visions. We use this framework to locate the Australian Commonwealth, all Australian states and 22 advanced democratic nation-states on a two-dimensional empirical map of democratic patterns for the period from 1995 to 2015. 相似文献
17.
18.
19.
20.