全文获取类型
收费全文 | 1477篇 |
免费 | 404篇 |
出版年
2023年 | 8篇 |
2022年 | 5篇 |
2021年 | 37篇 |
2020年 | 28篇 |
2019年 | 153篇 |
2018年 | 121篇 |
2017年 | 109篇 |
2016年 | 129篇 |
2015年 | 123篇 |
2014年 | 121篇 |
2013年 | 253篇 |
2012年 | 137篇 |
2011年 | 127篇 |
2010年 | 91篇 |
2009年 | 49篇 |
2008年 | 77篇 |
2007年 | 67篇 |
2006年 | 43篇 |
2005年 | 41篇 |
2004年 | 33篇 |
2003年 | 37篇 |
2002年 | 26篇 |
2001年 | 31篇 |
2000年 | 28篇 |
1999年 | 5篇 |
1997年 | 1篇 |
1996年 | 1篇 |
排序方式: 共有1881条查询结果,搜索用时 15 毫秒
991.
Krishan Kumar 《Nations & Nationalism》2015,21(4):589-608
Nationalism and revolution have generally been held to go together. Many nation‐states have had their origins in revolution, from the Americans in the 18th century to a host of Third World nation‐states in the 20th century. Generally, both modern revolutions and modern nationalism have the same origins, in 18th century Enlightenment thought. But this paper argues that, despite this common origin, the principles of revolution and nationalism are divergent, and can set one against the other. Revolutions emphasise freedom and equality; nationalism emphasises integration and unification. These principles can clash, though not inevitably and not always. The paper examines the 1789 French Revolution, the 1848 revolutions and the 1917 Russian revolution. It shows that in the first two cases, revolutionary aspirations came up against and were eventually displaced by nationalist aims. In the case of 1917, revolution paradoxically, and unintentionally, institutionalised nationalism. These examples show that, though linked at some high level of modern thought, revolution and nationalism express different and at times divergent strands of modernity. 相似文献
992.
993.
994.
995.
996.
997.
998.
Mineralogical and Chemical Characterization of Roman Slag from the Archaeological Site of Castra (Ajdovščina,Slovenia)
下载免费PDF全文
![点击此处可从《Archaeometry》网站下载免费的PDF全文](/ch/ext_images/free.gif)
S. Kramar V. Tratnik I. M. Hrovatin A. Mladenović H. Pristacz N. Rogan Šmuc 《Archaeometry》2015,57(4):704-719
This study deals with the mineralogical and chemical characterization of archaeometallurgical material from the Roman archaeological site of Castra (Ajdov??ina, western Slovenia). Samples were initially analysed via optical microscopy and X‐ray powder diffraction, with the composition of individual phases then determined using scanning electron microscopy coupled with electron‐dispersive spectroscopy, and Raman microspectroscopy. Chemical investigation was carried out by using inductively coupled plasma atomic emission spectroscopy to measure the major element content. The results showed that the slag originated from iron smithing operations, with calcium‐rich olivines, as well as wuestite and leucite, the most abundant phases. The investigated slags were also found to be characterized by significantly high lime levels, which probably promoted the formation of the calcium‐rich olivines. 相似文献
999.
Turquoise Mine and Artefact Correlation for Some Bronze Age Archaeological Sites in Hubei Province,China
下载免费PDF全文
![点击此处可从《Archaeometry》网站下载免费的PDF全文](/ch/ext_images/free.gif)
In China, there are places that are rich in gem‐quality turquoise resources, including north‐west Hubei Province and the nearby Baihe County in Shaanxi Province, and many ancient mining sites, although the mining history remains a mystery. Based on the compositional data from reference samples of known deposits, a comparison of the major and trace element contents of archaeological turquoise may help with determination of artefact provenance. This paper discusses new evidence of provenance‐tracking of turquoise in this area, obtained from geochemical analyses using REE and other trace elements of 22 turquoises and their surrounding rock samples from six ancient mines and three archaeological sites. The results indicate that the three archaeological turquoises from the tomb of the Middle Spring and Autumn Period (580–560 bc ) and the Warring States Period (476–221 bc ) in Hubei Province were made of raw material from north‐west Hubei Province and the nearby Baihe County in Shaanxi Province. [Correction added on 29 October 2014, after first online publication: In the preceding sentence, the correct dates for the Middle Spring and Autumn Period, and the Warring States Period have been added] 相似文献
1000.
Investigation of Organic Materials From the ‘Royal’ Burials of Xiongnu (Noin‐Ula,Mongolia) by Srxrf and XAFS Methods
下载免费PDF全文
![点击此处可从《Archaeometry》网站下载免费的PDF全文](/ch/ext_images/free.gif)
V. Trunova V. Zvereva N. Polosmak D. Kochubey V. Kriventsov K. Kuper 《Archaeometry》2015,57(6):1060-1077
The burials of famous Xiongnu people are a unique source of information about Xiongnu culture, due to the variety of organic findings. SRXRF analysis of hair, clay, bones, teeth and woollen cloth was carried out. An anomalously high copper content was observed in all hair samples, whereas the levels of copper in bone and clay were low. To define the hair morphology and the elemental distribution in the hair cross‐section, high‐resolution X‐ray computed tomography (HRXCT) and energy‐dispersive spectroscopy (EDS) with scanning electron microscopy (SEM) were used. The X‐ray absorption fine‐structure method (XAFS) was applied to determine the local copper environment. The majority of the copper species in the hair and enamel samples are present as Cu2+ cations in a distorted octahedral (4 + 2) coordination, surrounded by light ligands (oxygen/nitrogen). A similar distorted octahedral coordination is typical for both inorganic mixed oxide/hydroxide Cu nanosystems and metal–organic Cu complexes (with oxygen/nitrogen). 相似文献