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   433篇
  免费   10篇
  2024年   3篇
  2023年   6篇
  2022年   14篇
  2021年   13篇
  2020年   21篇
  2019年   9篇
  2018年   19篇
  2017年   11篇
  2016年   7篇
  2015年   17篇
  2014年   12篇
  2013年   35篇
  2012年   20篇
  2011年   37篇
  2010年   24篇
  2009年   44篇
  2008年   35篇
  2007年   21篇
  2006年   30篇
  2005年   19篇
  2004年   9篇
  2003年   5篇
  2002年   14篇
  2001年   6篇
  2000年   3篇
  1999年   4篇
  1998年   1篇
  1996年   1篇
  1995年   1篇
  1992年   1篇
  1991年   1篇
排序方式: 共有443条查询结果,搜索用时 15 毫秒
431.
佛教传入中国的时间,学术界多数认为是在汉明帝时,但是这种说法是不对的.<史记·秦始皇本纪>有"禁不得祠"的记载, "不得"当为佛陀之音译,佛祠者即佛寺.始皇下令禁止,足见佛教在当时社会的普及.因此,我们应把佛教传入的时间修正为秦始皇时代.考古资料也证明,秦成阳、汉长安地区与印、欧存在"先丝路"的交往,使佛教在秦始皇时代传入中国成为可能.  相似文献   
432.
本文探讨了商周时期球铃装饰的起源和流向,从发生动因、社会背景、参考原型等三个方面讨论了球铃装饰的起源,并指出在东周时期,球铃装饰衰落,球铃转而成为一种独立的装饰品,用来缝缀在服饰上。  相似文献   
433.
ABSTRACT

China’s Scenic and Historic Interest Areas are a major contributor to the State’s World Heritage lexicon. However, understanding of their values has led to confusion internationally and in China, not least with controversy over China’s latest promotion of the Natural Protected Areas System. This paper discusses values of China’s Scenic and Historic Interest Areas from the cultural landscape perspective through an in-depth case study of Lushan. A theoretical framework for recognising values of China’s Scenic and Historic Interest Areas has been set up and tested at Lushan, including exploring stakeholders’ understanding of its values as a world heritage site by using semi-structured interviews and questionnaires. The findings reveal that Lushan clearly represents cultural values inextricably associated with Scenic and Historic Interest Areas, and also need for supplementary advice on its Outstanding Universal Value (OUV). It suggests that the ideology driving management of China’s Scenic and Historic Interest Areas as national parks or natural parks focusing mainly on objective nature-related conservation without regard to the traditional Chinese philosophy of the culture-nature binary will adversely affect China’s Scenic and Historic Interest Areas as cultural landscapes and their community values.  相似文献   
434.
435.
Data from famines from the nineteenth century onward suggest that women hold a mortality advantage during times of acute malnutrition, while modern laboratory research suggests that women are more resilient to most pathogens causing epidemic diseases. There is, however, a paucity of sex-disaggregated mortality data for the period prior to the Industrial Revolution to test this view across a broader span of history. We offer a newly compiled database of adult burial information for 293 rural localities and small towns in the seventeenth-century Low Countries, explicitly comparing mortality crises against ‘normal’ years. In contrast to expected results, we find no clear female mortality advantage during mortality spikes and, more to the point, women tended to die more frequently than men when only taking into account those years with very severe raised mortality. Gender-related differences in levels of protection, but also exposure to vectors and points of contagion, meant that some of these female advantages were ‘lost’ during food crises or epidemic disease outbreaks. Responses to mortality crises such as epidemics may shine new light on gender-based inequalities perhaps hidden from view in ‘normal times’ – with relevance for recent work asserting ‘female agency’ in the early modern Low Countries context.  相似文献   
436.
基于多源数据的兰州市主城区城市职住空间关系研究   总被引:1,自引:0,他引:1  
王录仓  常飞 《人文地理》2020,35(3):65-75
随着中国经济转轨和社会转型,“职住分离”日趋严重,导致城市出现了一系列问题,急需对新的职住关系进行检视。职住关系研究的难点在于如何有效地锁定居住地、工作地,以及居民如何在居住地-工作地之间位移、居住-就业的空间匹配关系。论文以百度POI大数据和热力图为支撑,辅助问卷调查,结合兰州市土地利用现状图,综合应用职住比模型和最近距离等分析方法,多尺度刻画了兰州市主城区的职住关系。结果表明:在城区尺度上,兰州市职住关系总体处于平衡状态,职住平衡型占99.40%,居住倾向型和就业倾向型分别仅占0.12%和0.48%。从城市核心区到边缘区,职住失衡逐渐加重。职住平衡更多地体现在单位型社区上,失衡主要由商业型社区引致。在街道尺度上,职住关系差异明显,绝大多数街道处于职住平衡状态。城市核心区街道以“就业倾向型”为主;边缘区街道表现为“居住倾向型”。  相似文献   
437.
WB1复合气相缓蚀剂对清代带锈铁质钱币文物的保护研究   总被引:1,自引:0,他引:1  
气相缓蚀剂应用于带锈铁质文物保护是一种简单有效的方法。本研究通过对WB-1气相缓蚀剂处理前后带锈钱币的形貌检测,并结合XRD、XPS、SEM等手段对该缓蚀剂在带锈钱币表面的成膜方式进行了分析研究。结果表明,WB-1气相缓蚀剂能通过化学吸附作用在带锈铁质钱币表面形成一层保护膜,阻挡有害离子向铸铁文物内部的渗透,并促进带锈铁质钱币表面锈层组分向更为稳定的组成转变。WB-1气相缓蚀剂对带锈铁质钱币具有良好的保护效果,且不改变文物外观,符合文物保护要求。  相似文献   
438.
439.
China has a long history of sheep husbandry, and has several indigenous sheep breeds. However, the exact geographic origin of Chinese domestic sheep remains unclear. To provide valuable genetic information for origin of Chinese domestic sheep, we performed an ancient DNA study on 22 sheep excavated from four Bronze Age archaeological sites in Northern China. Two lineages (A and B) were observed in ancient Chinese sheep, of which lineage A was predominant reaching a frequency of 95.5%. Furthermore, phylogenetic network showed that the most frequent haplotype in ancient sheep was the founder of lineage A. These results suggest that Lineage A may hold the key to understanding the origin of Chinese domestic sheep. Sequence sharing and principal component analysis showed that the ancient Chinese sheep had a close affinity to modern Chinese sheep. However, there was no significant breed structure among three modern Chinese sheep groups, making it difficult to determine their relationship to ancient Chinese sheep. Lastly, our results imply that ancient DNA analysis could provide a new way to investigate prehistoric East-West contact.  相似文献   
440.
水分是导致壁画病害的关键因子。在封闭条件下,通过冷凝的方法对敦煌莫高窟B113窟的蒸发数量和特征进行了5年的监测。结果表明:B113洞窟水分年蒸发量为61189.9 g,日平均蒸发量为229.2 g,年蒸发量和日蒸发量都呈正弦曲线变化特征。监测表明:随着窟内温度升高,洞窟水分蒸发量增大;温度降低,洞窟水分蒸发量减小。温度决定蒸发水汽浓度,地气流出量决定蒸发水汽体量。洞窟水分蒸发从4月开始持续到12月中旬,6~8月洞窟水分蒸发最大,日水分蒸发7∶00~12∶00迅速上升,12∶00~23∶00下降,夜间也有持续的水分蒸发,是温度和地气活动量主导和控制着洞窟蒸发水分的数量。洞窟水分蒸发机制的揭示为今后洞窟微环境的调控和壁画预防性保护提供了理论基础和科学依据。  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