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   210篇
  免费   13篇
  2023年   3篇
  2022年   1篇
  2021年   4篇
  2020年   6篇
  2019年   11篇
  2018年   8篇
  2017年   15篇
  2016年   16篇
  2015年   4篇
  2014年   8篇
  2013年   49篇
  2012年   7篇
  2011年   7篇
  2010年   3篇
  2009年   14篇
  2008年   11篇
  2007年   6篇
  2006年   4篇
  2005年   4篇
  2004年   4篇
  2003年   1篇
  2002年   4篇
  2001年   4篇
  2000年   4篇
  1999年   3篇
  1997年   1篇
  1996年   1篇
  1995年   1篇
  1993年   2篇
  1991年   1篇
  1990年   2篇
  1988年   2篇
  1983年   1篇
  1981年   1篇
  1980年   1篇
  1978年   1篇
  1977年   2篇
  1972年   1篇
  1967年   1篇
  1965年   1篇
  1959年   2篇
  1953年   1篇
排序方式: 共有223条查询结果,搜索用时 15 毫秒
101.
This article presents the results of a coring operation which brought to light new evidence for the evolution of the coastal plain of Aulis (Boeotia, Central Greece) in the Holocene. Thanks to Homer, Aulis is best known as the gathering point of the Achaean fleet before it sailed to Troy and a sanctuary of the goddess Artemis. Ancient sources and archaeological evidence suggest the presence of an ancient marine bay, potentially used as a harbor. In the course of investigation, we drilled two cores, to a maximum depth of 4.20 m in the marshy lowlands and performed mollusc and micro-paleontological identifications, laser grain size analyses, and magnetic susceptibility measurements in order to reveal the facies evolution of the area. We obtained a chronostratigraphy sequence through a series of seven AMS 14C radiocarbon dates. Our study shows that the area was affected by a shallow marine incursion from the first half of the 6th millennium BC and gradually turned into a succession of shallow marine/lagoon environments from ca. 5000 cal. BC to the 2nd Century AD, and into a confined lagoon environment during the Roman and Byzantine periods.  相似文献   
102.
Formation processes and chronology are central to many archaeological endeavours, and accuracy in the latter is dependent on control of the former. Here we consider how to integrate geoarchaeological and chronometric evidence to better understand the formational history, along with the timing and duration of cultural activities, at a regionally significant site in the southern Cook Islands (Polynesia) which dates from ∼12th century AD. Initially we model natural and cultural processes of deposition using geoarchaeological evidence. The results are integrated with 21 radiocarbon dates, including nine new AMS results on identified medium and short-lived materials. Sample outliers are identified manually and statistically and a Bayesian analysis helps to refine age estimates for the site's 12 stratigraphic zones. The timing and rate of sediment accumulation is further considered through an age–depth model. Finally, the chronology developed from these combined approaches is used to address three key processes: 1) initial site use, potentially relevant to human colonisation of this Polynesian island and archipelago; 2) on-site activities and patterns of resource use; and 3) major marine deposition events which disrupted cultural activities and may have palaeoclimatological significance. The approach developed here potentially has utility elsewhere, particularly where human activities are recurrent and of limited duration.  相似文献   
103.
This article engages with recent work on the nature of the press in the late 17th and early 18th centuries that has emphasized that print, and more specifically printed news, came to dominate religious and political affairs. Recent scholarship has suggested that political elites embraced the new opportunities that the lapse of licensing (1695) offered by reading and buying newspapers and periodicals in ever greater numbers. Inherent in this portrayal of news culture is a sense that censorship had little effect on news‐writers. Journalists, so it is claimed, were left alone to pursue their trade free from any consistent interference. This article, by contrast, argues that scribal news – handwritten newspapers – continued to be important in the 18th century. The reason for the survival of scribal news‐writers such as John Dyer can be found, I argue, in understanding the complex relationship between press and parliament. Far from embracing the press, most members of parliament were, in fact, reluctant to allow unhindered publication of their discussions. While recognizing the importance of news to political debate, this article insists that the continued production of scribal news is indispensable for understanding both the nature of censorship and the power of the press in post‐licensing England.  相似文献   
104.
105.
106.
Alex 《世界》2009,(6):38-38
丰富的地质地理条件使得这个喜马拉雅山脉南麓的山地之国拥有着无敌的自然风光和户外运动资源——地球上拥有同样地质条件的另一个国家是瑞士。  相似文献   
107.
Alex 《世界》2009,(8):46-46
这个国家位于北欧,其国土面积近六分之一都位于极寒的北极圈以内,但与我们的想像不同,因为大西洋暖流的影响,这个国家的气候居然属于不太寒冷的温带气候。  相似文献   
108.
Is it ever justifiable to target non‐combatants deliberately? This article assesses Michael Walzer's claim that the deliberate targeting of non‐combatants may be justifiable during ‘supreme emergencies’, a view that has received some support but that has elicited little debate. It argues that the supreme emergencies exception to the prohibition on targeting non‐combatants is problematic for at least four reasons. First, its utilitarianism contradicts Walzer's wider ethics of war based on a conception of human rights. Second, the exception may undermine the principle of non‐combatant immunity. Third, it is based on a historical fallacy. Finally, it is predicated on a strategic fallacy–the idea that killing noncombatants can win wars. The case for rejecting the exception, however, has been opposed by those who persuasively argue that it is wrong to tie leaders' hands when they confront supreme emergencies. The final part of the article addresses this question and suggests that the principle of proportionality may give political leaders room for manoeuvre in supreme emergencies without permitting them deliberately to target non‐combatants.  相似文献   
109.
110.
The relationship between environmental variation and subsistence practices is a central point of discussion in much Oceanic archaeology. While human predation can significantly reduce prey populations, environmental variation also contributes to reductions in prey abundance, possibly leading to increased human competition and resource scarcity. At the Natia Beach site, Nacula Island, Fiji, geoarchaeological evidence suggests that coastal progradation began soon after initial occupation of the coastal plain. Additionally, at approximately 650 BP a marked increase in clay and silt deposition occurred. Changes in coastal geomorphology may be explained by landscape response to regional Mid-Holocene sea level fall combined with human induced soil erosion due to upland settlement. Smaller scale environmental changes associated with climate variability may have also played a role. Additionally, landscape change appears to have had a measurable impact on local nearshore mollusks that are sensitive to high levels of water turbidity. Minor evidence of human exploitation is observable in this shellfish assemblage, although changes in predation pressure may have allowed shellfish populations to recover. Increased ceramic diversity and fortified settlements also appear at approximately 650 BP on Nacula and other parts of Fiji. The suite of changes at Natia may be explained by processes of regional and local environmental changes, and human adaptation in terms of subsistence, spatial organization, and competition.  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