全文获取类型
收费全文 | 8711篇 |
免费 | 303篇 |
出版年
2020年 | 113篇 |
2019年 | 137篇 |
2018年 | 195篇 |
2017年 | 197篇 |
2016年 | 255篇 |
2015年 | 171篇 |
2014年 | 160篇 |
2013年 | 2590篇 |
2012年 | 228篇 |
2011年 | 258篇 |
2010年 | 232篇 |
2009年 | 206篇 |
2008年 | 206篇 |
2007年 | 151篇 |
2006年 | 148篇 |
2005年 | 123篇 |
2004年 | 101篇 |
2003年 | 77篇 |
2002年 | 110篇 |
2001年 | 142篇 |
2000年 | 98篇 |
1999年 | 119篇 |
1998年 | 77篇 |
1997年 | 96篇 |
1996年 | 88篇 |
1995年 | 75篇 |
1994年 | 93篇 |
1993年 | 93篇 |
1992年 | 99篇 |
1991年 | 74篇 |
1990年 | 68篇 |
1989年 | 77篇 |
1988年 | 74篇 |
1987年 | 95篇 |
1986年 | 76篇 |
1985年 | 103篇 |
1984年 | 105篇 |
1983年 | 133篇 |
1982年 | 115篇 |
1981年 | 108篇 |
1980年 | 112篇 |
1979年 | 97篇 |
1978年 | 94篇 |
1977年 | 95篇 |
1976年 | 85篇 |
1975年 | 86篇 |
1973年 | 68篇 |
1972年 | 66篇 |
1971年 | 65篇 |
1967年 | 58篇 |
排序方式: 共有9014条查询结果,搜索用时 62 毫秒
11.
12.
Jessie P.H. Poon 《Geografiska annaler. Series B, Human geography》1997,79(1):41-55
This paper examines the regional structure and extraregional trends of Europe and the Asia-Pacific. The formation of the European Community and the latter's potential enlargement to Eastern Europe contrasts with the Asia-Pacific which has resisted economic and political integration and pursued economic linkages with countries outside of the region. The difference in regionalization tendencies have resulted in more geographically defined subregions in Europe, and greater territorial fragmentation in the Asia-Pacific. Even though European countries exhibit tighter interlinkages with one another, the evidence indicates that their extra-regional links compare favorably with the Asia-Pacific for much of the period from 1965 to 1994. 相似文献
13.
Trigger levels for fine suspended sediment (FSS) load in streams are required to identify rainfall-runoff events that have significantly elevated FSS loads, compared with expected background loads, as a result of catchment disturbance. Stream FSS load data collected in the mine-impacted Magela Creek catchment in the wet-dry tropics were used to derive water quality management trigger levels for two approaches – a Before-After-Control-Impact Paired difference design (BACIP) and a regression relationship between observed FSS load and corresponding event discharge characteristics. The results indicate that both the BACIP and regression relationship approaches behave similarly, with similar FSS load events elevated above trigger levels. Notwithstanding this, it is recommended that in order to reliably assess the location and magnitude of a catchment disturbance on FSS load, a combination of BACIP and regression relationship approaches must be adopted. In this study, an event with a FSS load above trigger levels associated with both BACIP and the regression relationship fitted for the downstream site is considered to be significantly elevated as a result of a disturbance within the mine-impacted region. While this technique cannot conclusively determine whether the cause of the disturbance is mine-related or natural (such as fire or bank erosion), it is an efficient statistical method of identifying events that warrant further investigation and management action, if required. 相似文献
14.
Y. H. Dennis Wei 《Geografiska annaler. Series B, Human geography》2011,93(3):237-251
This article attempts to advance the research on industrial districts and regional development through a study of the restructuring of the clothing industry in Wenzhou Municipality, a regional driver of the Chinese economy. Wenzhou is known for the Wenzhou model of development traditionally centred on family‐owned small businesses embedded in local institutions. The clothing industry is one of the leading industries in Wenzhou, and a cluster with national significance has emerged, where most of the production components can be purchased locally. However, the industry has been scaled up nationally and internationally, with the expansion of sales networks and production facilities across China, and to a lesser extent, abroad. This restructuring has changed the endogenous nature of industrial clusters/districts. The restructuring challenges the orthodox notion of the Wenzhou model and the New Regionalism literature, particularly the orthodox notion of Marshallian industrial districts that overly emphasizes small firms and local assets, and the global production network perspective that highlights coupling with global lead firms in regional development. 相似文献
15.
16.
17.
Alexander Thomas T. Smith 《Anthropology today》2010,26(4):4-7
The pro‐life movement regularly employs tactics of political harassment in its campaign against abortion. As the murder of the controversial abortion doctor George Tiller in Wichita, Kansas, demonstrated last year, such tactics often betray a potential for violence. This paper explores how the militant tactics of the pro‐life movement in the 1990s have contributed to the formation of a ‘new’ political identity in Kansas politics: that of the moderate Republican. But for those that seek to counter‐mobilize against the Christian right, the political stakes remain high. 相似文献
18.
19.
Jennifer G. Kahn John Sinton Peter R. Mills Steven P. Lundblad 《Journal of archaeological science》2013,40(2):1194-1202
We apply X-ray fluorescence (XRF) geochemical analysis to a collection of 'Opunohu Valley lithic artifacts from Mo'orea island to investigate the local scale of raw material procurement, adze production, use, and exchange within the Society Island archipelago. We use these data to document the distribution of non-local versus local volcanic artifacts in 'Opunohu Valley house sites, ritual sites, and specialized sites, as a means for establishing intra-site production and consumption patterns, and access to exotic, possibly superior, stone resources, and how these two themes correlate with site function or household wealth and status. Overall, 30% of the artifacts analyzed via WDXRF derive from non-local sources, notably two other islands in the archipelago outside of the political boundaries of Moorean chiefdoms. Our case study thus provides the first direct material evidence of intra-archipelago trade and exchange in the Society Islands. Intra-archipelago trade in adzes was certainly in place by as early as A.D. 1350, if not earlier, and continued up until the time of European contact. In addition, our analyses have identified a local adze production locale in the Afareaitu district of Mo'orea island. The patterns of local versus non-local adze production and exchange strongly suggest that dual interaction spheres were involved. The correlation between adzes and adze-related debris produced from off-island sources and sites with specialized use, which were often reserved for the social, ritual, and political elites in Ma'ohi society suggests that some of the exotic adzes derived from gift exchange between Mo'orea and ruling elites in Tahiti and the Leeward Islands. These adzes from afar would have solidified socio-political and ideological alliances between elites in the Windward and Leeward sectors of the archipelago. 相似文献
20.