全文获取类型
收费全文 | 210篇 |
免费 | 12篇 |
出版年
2023年 | 7篇 |
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 4篇 |
2019年 | 19篇 |
2018年 | 15篇 |
2017年 | 15篇 |
2016年 | 17篇 |
2015年 | 9篇 |
2014年 | 6篇 |
2013年 | 49篇 |
2012年 | 9篇 |
2011年 | 6篇 |
2010年 | 13篇 |
2009年 | 10篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1997年 | 2篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有222条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
105.
Jessica Larive 《History of European Ideas》2013,39(1-6):667-671
106.
107.
Protected areas in Canada: decade of change 总被引:2,自引:0,他引:2
The last decade has witnessed more changes in protected area systems in Canada than any other. The area set aside has more than doubled, and almost 7 percent of Canada's ecosystems are now protected compared with 3 percent in 1989. Several high-profile reports have indicated a decline in ecological integrity of protected area systems. Major changes in legislation and policy have followed with a new National Parks Act, National Marine Conservation Areas Act, a Parks Canada Agency Act and a revised national park's policy. The paper describes these major changes and their implications, provides understanding of why they occurred and suggests ongoing challenges facing protected area systems in Canada in the future. 相似文献
108.
Thomas G. Garrison Stephen D. Houston Charles Golden Takeshi Inomata Zachary Nelson Jessica Munson 《Journal of archaeological science》2008,35(10):2770-2777
This article presents an extensive evaluation, in several contiguous or near-contiguous areas, of the viability of IKONOS satellite imagery in detecting sub-canopy Maya settlement in Peten, Guatemala. Initial research in and around San Bartolo, Guatemala, led to the conclusion that IKONOS imagery could be highly effective in detecting and predicting Maya settlement of the Preclassic and Classic periods, in zones of dense occupation near swampy lowlands known as bajos. The pioneering methods at San Bartolo are applied here to other regions in the Maya lowlands, but with mixed or unpromising results. Preliminary evaluation indicates that local climate, geology, hydrology, topography, pedology, and vegetation differ dramatically in these other regions, with consequences for wider application of the settlement signature discerned at San Bartolo. Possible reasons for these difficulties are offered in this paper, along with ways to strengthen the use of multispectral imagery in archaeological survey of tropical forests. 相似文献
109.
Jessica C. E. Gienow-Hecht 《外交史》2002,26(3):481-491
Book reviewed in this article:
Wilfried Loth and Jürgen Osterhammel, Internationale Geschichte: Themen – Ergebnisse – Aussichten 相似文献
Wilfried Loth and Jürgen Osterhammel, Internationale Geschichte: Themen – Ergebnisse – Aussichten 相似文献
110.