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   414篇
  免费   6篇
  2023年   3篇
  2022年   9篇
  2021年   7篇
  2020年   11篇
  2019年   14篇
  2018年   11篇
  2017年   10篇
  2016年   19篇
  2015年   15篇
  2014年   11篇
  2013年   39篇
  2012年   19篇
  2011年   24篇
  2010年   16篇
  2009年   26篇
  2008年   27篇
  2007年   33篇
  2006年   21篇
  2005年   15篇
  2004年   18篇
  2003年   7篇
  2002年   15篇
  2001年   13篇
  2000年   11篇
  1999年   7篇
  1998年   4篇
  1997年   2篇
  1996年   3篇
  1995年   3篇
  1992年   3篇
  1991年   1篇
  1990年   1篇
  1985年   1篇
  1983年   1篇
排序方式: 共有420条查询结果,搜索用时 31 毫秒
1.
The fossil record suggests that modern human morphology evolved in Africa between 150,000 and 50,000 years ago, when the sole inhabitants of Eurasia were the Neanderthals and other equally nonmodern people. However, the earliest modern or near-modern Africans were behaviorally (archaeologically) indistinguishable from their nonmodern, Eurasian contemporaries, and it was only around 50,000-40,000 years ago that a major behavioral difference developed. Archaeological indications of this difference include the oldest indisputable ornaments (or art broadly understood); the oldest evidence for routine use of bone, ivory, and shell to produce formal (standardized) artifacts; greatly accelerated variation in stone artifact assemblages through time and space; and hunting-gathering innovations that promoted significantly larger populations. As a complex, the novel traits imply fully modern cognitive and communicative abilities, or more succinctly, the fully modern capacity for Culture. The competitive advantage of this capacity is obvious, and preliminary dates suggest that it appeared in Africa about 50,000 years ago and then successively in western Asia, eastern Europe, and western Europe, in keeping with an African origin. Arguably, the development of modern behavior depended on a neural change broadly like those that accompanied yet earlier archaeologically detectable behavioral advances. This explanation is problematic, however, because the putative change was in brain organization, not size, and fossil skulls provide little or no secure evidence for brain structure. Other potential objections to a neural advance in Africa 50,000-40,000 years ago or to the wider Out-of-Africa hypothesis, include archaeological evidence (1) that some Neanderthals were actually capable of fully modern behavior and (2) that some Africans were behaviorally modern more than 90,000 years ago.  相似文献   
2.
I summarize recent archaeological work in Oaxaca, Mexico, with a focus on questions central to world prehistory: the origin and collapse of complex societies. Monte Albán was the capital of an emerging civilization in the southern highlands of Mexico during the second half of the first millennium B.C. Soon after the foundation of the ancient city, there is evidence for state formation and a political expansion into regions outside the Valley of Oaxaca. Centuries later, Monte Albán went into decline, giving way to the competing small polities found throughout Oaxaca at the time of the Spanish conquest. Since the late 1960s, our knowledge of these changes has been transformed by study of Oaxaca's pre–Monte Albán past, regional settlement surveys, and processual model building. Evolutionary and historical perspectives allow for significant refinement of current debates surrounding the rise and fall of complex societies in Oaxaca.  相似文献   
3.
In the context of global warming, changes in extreme weather and climate events are expected, particularly those associated with changes in temperature and precipitation regimes and those that will affect coastal areas. The main objectives of this study were to establish the number of extreme events that have occurred in northeastern New Brunswick, Canada in recent history, and to determine whether their occurrence has increased. By using archived regional newspapers and data from three meteorological stations in a national network, the frequency of extreme events in the study area was established for the time period 1950–2012. Of the 282 extreme weather events recorded in the newspaper archives, 70% were also identified in the meteorological time series analysis. The discrepancy might be explained by the synergistic effect of co‐occurring non‐extreme events, and increased vulnerability over time, resulting from more people and infrastructure being located in coastal hazard zones. The Mann Kendall and Pettitt statistical tests were used to identify trends and the presence of break points in the weather data time series. Results indicate a statistically significant increase in average temperatures and in the number of extreme events, such as extreme hot days, as well as an increase in total annual and extreme precipitation. A significant decrease in the number of frost‐free days and extreme cold days was also found, in addition to a decline in the number of dry days.  相似文献   
4.
Courtly love appeared in twelfth‐century Europe as a dissent from the emotional regime established by the Gregorian Reform, by setting the lady, instead of God, as the object of worship. From a game‐theory perspective, courtly love and hedonism correspond to Nash equilibria, in contrast to Christian marriage, whose stability is threatened by sex‐as‐appetite on one side and devotion to God on the other, and whose maintenance depends on moral control. The Church developed fear and shame, which are counter‐emotions to desire‐as‐appetite. Courtly love restored the thrill of forbidden adventure. It also shared traits common to innovations in the natural world: it added complexity (by increasing costs, emphasizing courtship, self‐restraint, and extremes of suffering); it was made possible by the plasticity of mating relationships; it introduced a small disorder in the ordered regime of Christian marriage; it demanded an adaptive effort, requiring the man to face ever more perilous trials and the woman to appear ever more attractive. Though obtained as a small deviation from the existing emotional regime, it had thoroughgoing and long‐lasting consequences for social control and for the political power of the Church. It also deeply modified the dynamic of longing in ego's representation. By taking the temporal form of a capture, it contrasts with twelfth‐century Bengal, where love was characterized by maintenance in an indefinitely repeating worship, by the absence of a here‐now versus target‐later dualism. It also contrasts with eleventh‐century Heian Japan, where love was intermingled with the melancholy of an impossible return, which is the antithesis of the concept of capture.  相似文献   
5.
The reemergence of cognitive studies in comparative psychology and ethology, coupled with ongoing archaeological discoveries and recent advances in genomics, have contributed to the current explosion of scientific interest in dogs (Canis lupus familiaris). The long and complex evolution of a human-dog relationship is explored from the differing perspectives of ethology, cognitive sciences, evolutionary anthropology, archaeology, and paleoanthropology. Our understanding of dogs is again shedding light on human cognitive evolution and the complex, and at times controversial, process of domestication.  相似文献   
6.
杨勃  王茂军  王成 《人文地理》2019,34(5):26-35
借助可视化软件,从梳理研究热点及识别研究主题两方面,厘清世界城市网络的研究脉络与核心,探索未来研究动向。研究发现:①世界城市网络研究国际合作广泛,研究热点响应迅速,经历“世界城市”与“世界体系”分化阶段,网络结构聚焦阶段,城市网络的空间、地位、经济等多元阶段变迁;②研究由城市网络链接结构、全球中心城市、城市网络节点地位及城市网络经济学四大主题构成;③以往研究缺乏对网络结构绩效的研究,对非世界城市的关注不够,城市地位与经济之间的关系仍处于描述阶段;④对世界城市网络结构的内涵、非世界城市研究、整体网络与个体网络关系、经济学方向进行展望,使世界城市网络的未来研究更加全面丰富。  相似文献   
7.
魏晋南北朝玉佩研究   总被引:1,自引:0,他引:1  
魏晋南北朝玉佩自发现以来,学术界对其性质和组构样式的判断皆不甚明了。近年南京仙鹤观东晋玉佩的完整发现,为研究其结构与性质提供了详实的研究资料。本文以此为基础,结合国内各地玉佩的发现情况及历史文献资料,分析魏晋南北朝时期玉佩发展、演变的历史原因,并试对玉佩构件进行了初步的复原研究。  相似文献   
8.
峡江地区汉晋南朝花纹砖上的车轮纹饰   总被引:1,自引:0,他引:1  
郑君雷 《江汉考古》2006,1998(3):60-68,94
文章对峡江地区汉晋南朝花纹砖上的车轮纹饰进行全面检讨。首先将车轮纹饰分为若干种类,其后以发掘报告为依据讨论各类车轮花纹砖的年代,最终归纳出峡江地区车轮纹饰的演变线索。文章以为,峡江地区的车轮花纹砖大约出现在新莽至东汉初期,东汉中晚期至东晋最为流行,南朝仍有发现。文章同时分析了各阶段车轮纹饰的时代特征,并且简要讨论了与车轮花纹砖相关的若干问题。  相似文献   
9.
论中国古代治边思想的特点、演变和影响   总被引:2,自引:1,他引:1  
古代治边思想大体形成于秦汉,发展和延续至清代,其内涵是动态变化的,经历了从肤浅到成熟的过程,各个时期的治边思想又有其特色。古代治达思想总体上有两个基本的特点:统治对开疆拓土多持相对保守的态度,认为理想的边疆治理是“守在四夷”;从“华夷有别”的治边观出发,在边疆地区施行相对宽松的羁縻统治,同时重视在边疆传播封建化的教化作用。章还以封建统治对边疆民族的治策和对边疆的经济开发为例,阐述了古代治达思想对边疆治策的广泛影响。  相似文献   
10.
Summary : The article explores deployment of the Darwinian narrative of the “natural history of humanity” in Russian physical anthropology in the late nineteenth to the early twentieth century. It traces two narratives developed by the leading Russian school of physical anthropology: one narrative advanced a universalist vision of collective scholarly enterprise working toward clarifying the missing links in the a priori accepted developmental evolutionary model. The other constructed a new language that undermined the idea of species/subspecies/races/nations/ as stable, externally bounded, and internally homogeneous units and attempted to rationalize imperial hybridity. The article's main focus is on the latter classificatory narrative, its relational methodology, and the protostructuralist units of comparison that it produced.  相似文献   
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