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   1837篇
  免费   82篇
  2024年   3篇
  2023年   21篇
  2022年   21篇
  2021年   41篇
  2020年   80篇
  2019年   68篇
  2018年   78篇
  2017年   109篇
  2016年   83篇
  2015年   51篇
  2014年   61篇
  2013年   454篇
  2012年   123篇
  2011年   81篇
  2010年   54篇
  2009年   74篇
  2008年   77篇
  2007年   65篇
  2006年   57篇
  2005年   38篇
  2004年   46篇
  2003年   47篇
  2002年   25篇
  2001年   35篇
  2000年   18篇
  1999年   12篇
  1997年   6篇
  1996年   7篇
  1995年   9篇
  1994年   8篇
  1993年   5篇
  1992年   13篇
  1991年   8篇
  1990年   1篇
  1989年   5篇
  1988年   5篇
  1987年   7篇
  1986年   5篇
  1985年   5篇
  1984年   10篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
排序方式: 共有1919条查询结果,搜索用时 171 毫秒
61.
We have applied cluster analysis to mercury intrusion porosimetry data from 219 archaeological bones (121 human and 98 animal) and soil chemistry data from 219 accompanying soil samples (1 per bone sample), to investigate the influence of soil chemistry on bone preservation. The samples chosen for the study were obtained from sites ranging in time from the pre-modern to the Mesolithic and were representative of burial environments across Europe (from the Baltic to the Mediterranean). These results represent the single largest database for archaeological bone preservation in the European Holocene to date and demonstrate the potential for large-scale diagenetic studies to help develop long term preservation strategies for our European heritage. Despite the variety of sites and environments, bones could be categorised into only four main diagenetic types. Furthermore, soil chemistry appears to significantly affect only one type of preservation, the pathway characterised by loss of mineral. In neutral to basic soils, taphonomy and in particular the differences between the treatment of human and animal remains, becomes the dominating factor in determining preservation. Using these results, strategies for heritage management of archaeological sites can be suggested; grouping sites into those requiring immediate excavation and those where in situ preservation is viable.  相似文献   
62.
肯尼迪在美国面临巨额国际收支逆差的背景下入主白宫。严重的逆差导致美国的黄金大量外流,引起西方世界对美元信用的置疑。因此,调节逆差成为肯尼迪政府的重要使命。肯尼迪政府调节逆差的政策主要体现在肯尼迪提交给国会的两份特别咨文中,即1961年2月6日的“黄金和国际收支逆差特别咨文”和1963年7月18日的“国际收支特别咨文”。以两份咨文为蓝本,有关部门展开了系列的开源节流行动。美国的逆差调节行动使美国政府内部和北约盟国间的斗争起伏跌宕,充分暴露出权力政治的实质。  相似文献   
63.
"承负说"与两汉灾异论   总被引:2,自引:0,他引:2  
韩吉绍 《史学月刊》2007,1(12):29-36
作为《太平经》基础理论的"承负"说主要有两层含义:一是善恶报应,继承汉代之前中国本土的善恶报应思想;二是对汉代社会危机提出的一套解释系统,此与灾异论的盛行具有重要关联。前者为《太平经》对下层民众进行宗教教化准备了前提,后者为其政治改良方案的提出铺平了道路。尤其后者,对两汉之际不同派别的道教运动产生了革命性的影响,进而深刻影响了后汉之政治变迁。  相似文献   
64.
本文认为,晚清时期,圣母圣心会在中蒙古教区获得了持续、稳定的发展。教会的成功既在于其传教方法得当,也在于教会拥有较多的社会资源。怎样评价教会的传教活动,并不是一个容易的话题。  相似文献   
65.
基于对新中国建国方针的认识、对社会主要矛盾的判断和利用私营经济发展生产力的考虑,建国初期党和政府把“劳资两利”确定为处理私营企业劳资关系的基本政策。它包括保障私营企业工人的权益、保障资本家的正当权益、努力构建和谐的劳资关系三方面内容。这一政策体现了以毛泽东为核心的第一代中央领导集体勇于探索、开拓创新的伟大精神,极大地丰富和发展了马克思主义劳资关系理论,为构建当代中国非公有制企业和谐的劳资关系提供了有益的借鉴。  相似文献   
66.
Khonkho Wankane is a ceremonial center located in the southern Lake Titicaca Basin, Bolivia. During the Late Formative period (AD 1–500), its residents practiced agropastoral lifeways and participated in the rise of the state at Tiwanaku. Like at many Andean sites, bones from the family Camelidae are the most abundant large mammal in domestic contexts. Identifying camelid morphotypes represented by these bones carries far‐reaching implications for understanding past hunting, herding, and caravanning practices, and their roles in larger social and economic webs. Identifications were based on a locally focused reference collection, including llamas (Lama glama) from the immediate vicinity of the site, as well as Andean guanacos (Lama guanicoe), a much smaller morphotype than the Patagonian guanacos used in many osteometric studies. Multivariate statistical analyses and incisor morphology identified all four camelid. Different analyses suggest that the crux of osteometry lies in the reference collection, not the statistical test. An additional, very large morphotype likely corresponds to a castrated llama, the preferred cargo animal among modern drovers. The presence of these animals is interpreted as evidence that groups hunted vicuña (Vicugna vicugna) and guanaco, which are not currently present around the site, herded llamas and alpacas (Vicugna pacos), and perhaps organized caravans with castrated llamas. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   
67.
汉代郡治之县,在同郡属县中秩级最高。由张家山汉简《二年律令·秩律》载录的各郡辖县秩级,可探知西汉初年某些郡的治所: 陇西郡治所为上邽县;上郡治所为高奴县;北地郡治所为彭阳县。此外,西汉初年汉中、河东、河内三郡治所也可以凭借《秩律》得到进一步限定。《秩律》在西汉初年郡治研究上的价值需要得到重视。  相似文献   
68.
Past approaches to the Weight Method (use of the weight of excavated bone assemblages to evaluate the relative potential meat yield of the animals from which they came) are critically reviewed. They do not account for both inter-taxon and intra-taxon variability in the relationship between bone weight and total body or soft tissue weight. Critics of the Weight Method have assumed that these problems are insurmountable. It is argued here that they can be overcome practically. Solutions lie in the integration of classic Weight Method approaches, which assume a consistent ratio of bone weight to body weight between different taxonomic and size groups, with the understanding of animal scaling provided by studies of skeletal mass allometry. Allometric equations derived from original data (regarding cod, Gadus morhua) and available from published sources (regarding mammals and birds) are used to illustrate this argument. Three practical approaches to the Weight Method are suggested and briefly explored, using bone weight data from Earls' Bu, a Norse site in Orkney, Scotland, as a case study.  相似文献   
69.
Current methods of sexing archaeological cattle bones, in particular the metapodials, are based upon past research into contemporary breeds and this work embraces a limited sample size, spread across a vast geographical area. Although the separation of cows and bulls is not in question, there appears a great deal of subjectivity in the literature concerning the identification of castrated beasts. Living bone is in a dynamic state of equilibrium with the rest of the body and responds to increased loading, that is, an increase in weight of the beast or stress/strain through strenuous movement, by remodelling. If cows and oxen are performing the same work, as for example in ploughing, then loading on the bones will be similar. These bones will thus respond by remodelling in corresponding fashion, and hence any morphological and metrical distinctions will be clouded. Horn-cores are less subject to these constraints, although in some cultures there may be loading on these bones, for example through attaching the harness to the horns for ploughing. The Chelmsford cattle horn-cores constitute waste from some industrial activity and it is argued in the text that horn-working is the most likely candidate, together with possibly tanning. Sexing of the bones strongly indicated male animals, with few females being present. A procedure for detecting castrated cattle (oxen) is presented, the results of which suggest an equivalent ratio of oxen to bulls.  相似文献   
70.
佛头洲原位于香港维多利亚港东面入口的一个小岛。文献记述该岛尚存古代税关遗址,1964年和1979年的调查发现"德怀交趾国遥通贡赋"石碑和建筑构件,但其具体年代难作定论。2004年的田野调查发现多座建筑遗迹,遗物则有瓦当和篆刻石柱等,可以确定该遗址保存清末时期的佛头洲税厂遗存,对于研究香港开埠初期猖獗的鸦片贸易、清末九龙关的沿革和新界拓展等问题提供重要的实物资料。  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