首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8843篇
  免费   362篇
  2020年   129篇
  2019年   149篇
  2018年   213篇
  2017年   221篇
  2016年   256篇
  2015年   182篇
  2014年   155篇
  2013年   2451篇
  2012年   204篇
  2011年   227篇
  2010年   238篇
  2009年   230篇
  2008年   235篇
  2007年   197篇
  2006年   174篇
  2005年   137篇
  2004年   107篇
  2003年   129篇
  2002年   111篇
  2001年   129篇
  2000年   121篇
  1999年   138篇
  1998年   117篇
  1997年   88篇
  1996年   99篇
  1995年   100篇
  1994年   96篇
  1993年   94篇
  1992年   92篇
  1991年   62篇
  1990年   67篇
  1989年   82篇
  1988年   81篇
  1987年   101篇
  1986年   82篇
  1985年   119篇
  1984年   143篇
  1983年   129篇
  1982年   115篇
  1981年   115篇
  1980年   113篇
  1979年   100篇
  1978年   104篇
  1977年   94篇
  1976年   105篇
  1975年   96篇
  1974年   82篇
  1973年   60篇
  1972年   52篇
  1970年   51篇
排序方式: 共有9205条查询结果,搜索用时 501 毫秒
11.
12.
News wire services were established in the United States in the mid-nineteenth century to gather and distribute news for local newspapers, using the new technology of the telegraph. With that early beginning in the era of electronic communication, the expansion of news wire services spans the change from a society of local communities to a more nationally integrated society. This paper assesses the importanceof changes in the medium's spatial organization which promoted national culture. The first wire services were local, ad hoc groups, organized to achieve greater efficiency in news-gathering. Formal services were first organized on a local basis, but in 1848 they began to sell news to the major urbanized portions of the United States. As the nation grew, the desire for greater efficiency conflicted with the desire for greater autonomy. Regional wire services persisted from the 1860s to the 1880s but after the 1880s, a tenuous national organization was achieved, cementing itself into a national system after the turn of the century. Efficiency in news collection was the primary reason for the increasing scale of news collecting groups. Each step toward larger spatial coverage, fed the growth of a complex interdependent urban system.  相似文献   
13.
14.
15.
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   
16.
17.
18.
19.
20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号