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   488篇
  免费   11篇
  2024年   1篇
  2023年   1篇
  2022年   3篇
  2021年   3篇
  2020年   12篇
  2019年   8篇
  2018年   12篇
  2017年   9篇
  2016年   7篇
  2015年   6篇
  2014年   13篇
  2013年   17篇
  2012年   22篇
  2011年   49篇
  2010年   38篇
  2009年   56篇
  2008年   44篇
  2007年   36篇
  2006年   33篇
  2005年   28篇
  2004年   23篇
  2003年   16篇
  2002年   7篇
  2001年   16篇
  2000年   12篇
  1999年   4篇
  1998年   7篇
  1996年   3篇
  1995年   3篇
  1994年   2篇
  1993年   2篇
  1992年   1篇
  1991年   2篇
  1990年   1篇
  1984年   1篇
  1974年   1篇
排序方式: 共有499条查询结果,搜索用时 15 毫秒
1.
Traditional understandings of the development of the medieval English longbow and its role in the fourteenth-century ‘infantry revolution’ have recently been challenged by historians. This article responds to the revisionists, arguing based on archaeological, iconographic and textual evidence that the proper longbow was a weapon of extraordinary power, and was qualitatively different from – and more effective than – the shorter self-bows that were the norm in England (and western Europe generally) before the fourteenth century. It is further argued that acknowledging the importance of the weapon as a necessary element of any credible explanation of English military successes in the era of the Hundred Years War does not constitute ‘technological determinism’.  相似文献   
2.
This paper examines the comparatively patchy evidence for the pastoral provision and personal faith of late medieval Scottish combatants below the rank of knight. By examining such sources as papal supplications, royal financial accounts, parliamentary rolls, chronicles, poetry and the cartularies of Scottish monastic houses and burgh collegiate churches, it is possible to identify elite and parish provision of churchmen serving the needs of Scottish troops as they mustered, trained and prepared for battle. In addition, this evidence also highlights a number of cults and relics popular with the social ranks of the ordinary Scottish soldiery, including those of SS Ninian, Leonard, Thomas Becket, Columba, the Blessed Virgin Mary and — often cast as the nemesis of Scottish troops — Cuthbert. However, this survey also points to some tensions between the spiritual interests of Scottish servicemen and their ruling elites.  相似文献   
3.
郑廷辉 《丝绸之路》2009,(20):98-101
学校辅导工作,尤其是中、小学的辅导工作应对青少年身心发展方面的压力多予以关注。近年来,青少年在心理健康方面出现的诸多问题表明,许多心理行为问题的发生和危机事件的出现,都与青少年面临的生活压力有着密切关系。学校心理辅导工作应明确青少年心理行为问题发生的基本原因,在辅导过程中积极引导青少年健康成长,在心理健康教育课程中,有针对性地讲授有关生活压力缓解的知识和方法,以有效的策略帮助青少年顺利度过青春期难关。  相似文献   
4.
史前漆膜的分析鉴定技术研究   总被引:5,自引:0,他引:5  
研究了漆膜分析的三种主要方法:裂解质谱,红外光谱,裂解色谱。通过大量实验比较了各种方法的适应性和可靠性,建立了以裂解色谱/富里叶红外光谱联用技术来鉴定漆膜,并对影响裂解反应的因素及色借条件进行了深入的研究,获得了可以重复,具有特征性的漆膜高分辨裂解色谱图,同时对裂解色谱图中主要组分作了定性鉴定,提高了裂解色谱法分析漆膜的可靠性。该方法具有灵敏度高,样品用量小,共存杂质影响小,操作简便等优点。应用核分析技术对河姆渡,良诸庙前遗址出土的二件红色涂料样品进行了鉴定。分析结果证实了河姆渡出土的红色涂料木碗上的涂料是我国至今发现的最早的生漆漆膜。  相似文献   
5.
甘肃酒泉、嘉峪关壁画墓霉菌分离鉴定与防治研究   总被引:1,自引:1,他引:0  
通过对墓葬壁画霉菌分离鉴定,筛选出合适的防霉材料,对壁画进行防霉处理是解决未搬迁尚很潮湿壁画墓科学保存问题的一个重要方面。  相似文献   
6.
Jarzembowski, Edmund A., Wang, B. &; Zheng, D., October 2017. A slender new archaic beetle in Burmese amber (Coleoptera: Archostemata). Alcheringa 42, 110–114. ISSN 0311-5518.

A new archostematan beetle, Clessidromma palmeri gen. et sp. nov. (Insecta: Coleoptera) is described from mid-Cretaceous Burmese amber from northern Myanmar. It has a uniquely specialized body form for which a new stem tribe, Clessidromatini trib. nov., is proposed in the subfamily Ommatinae of the family Cupedidae sensu lato.

Edmund Jarzembowski* [] Bo Wang? [] and Daran Zheng? [] State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Rd, Nanjing 210008, PR China. *Also affiliated with: Department of Earth Sciences, The Natural History Museum, London SW7 5BD, UK. ?Also affiliated with: Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Science, Beijing 100101, PR China. ?Also affiliated with: Daran Zheng, Department of Earth Sciences, The University of Hong Kong, Hong Kong Special Administrative Region, PR China.  相似文献   
7.
<正>Four of us went to a suburb in Lhasa for an autumn outing one day in the middle of October.We drove out of the downtown area heading east and reached our destination,Caigongtang Temple.Interestingly enough,it was a result of random selection based on Google maps that led us here since we neither knew  相似文献   
8.
包山简中的七条大事纪年早先被定在楚怀王时期,其中的"鲁阳公以楚师后城郑之岁"后来又被李学勤先生等考订为追记。清华简《系年》中有关于鲁阳公率楚军与三晋、郑国交战的记载,在楚声王至悼王年间,应与"鲁阳公以楚师后城郑之岁"一事相关。包山简中的另一纪年"齐客陈异致福于王之岁",可能是葛陵简中的"齐客陈豫贺王之岁"。同一批简牍中发现的楚简大事纪年未必是逐年相次的。  相似文献   
9.
Research on complex systems has identified various aggregate relationships in phenomena that describe these systems. Travel length has been characterized by negative power distributions. Controversy, however, exists over whether mobility patterns can be modeled in terms of a simple power law (Lévy flight model) or that more complicated power laws (exponential power law, truncated Pareto) are required. This study concentrates on two issues: testing the validity of exponential power laws and truncated Pareto distributions in urban systems to describe aggregate mobility patterns, and examining differences in mobility patterns for different travel purposes. The article describes the results of an analysis of Global Positioning System (GPS) taxi trajectory data, collected in Guangzhou, China, to identify mobility patterns in the city. The least squares statistic is used to estimate the parameters of the distribution functions. Results suggest that a fusion of functions, based on an exponential power law and a truncated Pareto distribution, represents the travel time distribution best. Moreover, the findings of this study indicate different mobility patterns to exist for different travel purposes.  相似文献   
10.
Northeastern China is one of the centers of early development of agriculture and sedentary life, as well as of the subsequent development of social complexity and distinct cultural attributes. While the outlines of this trajectory are clear, its important details are still elusive. Like all other regions of northern China, there is little data on the all-important transition from nomad hunter-gatherers to sedentary agriculturalists. The Fuxin Regional Survey was designed as the first step in accumulating new data and addressing the geographic and ecological contexts of these socioeconomic processes. Among the most remarkable results of this survey is the identification of early ceramics, which possibly predate the transition to agriculture. The systematic collection and analysis of stone tools was done in a way never before done in this region. Analysis of our findings, using GIS and other methods, sheds new light on the local trajectory of human adaptation in this area.  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