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   1438篇
  免费   3篇
  1441篇
  2023年   2篇
  2020年   3篇
  2019年   2篇
  2018年   273篇
  2017年   200篇
  2016年   233篇
  2015年   14篇
  2014年   5篇
  2013年   36篇
  2012年   31篇
  2011年   159篇
  2010年   178篇
  2009年   39篇
  2008年   72篇
  2007年   74篇
  2006年   1篇
  2005年   31篇
  2004年   12篇
  2003年   9篇
  2002年   1篇
  2001年   4篇
  1999年   2篇
  1997年   2篇
  1996年   2篇
  1994年   3篇
  1993年   3篇
  1992年   2篇
  1991年   4篇
  1990年   3篇
  1989年   1篇
  1988年   3篇
  1986年   2篇
  1985年   2篇
  1984年   1篇
  1983年   4篇
  1982年   3篇
  1981年   2篇
  1980年   2篇
  1979年   4篇
  1978年   1篇
  1977年   4篇
  1976年   3篇
  1975年   2篇
  1973年   2篇
  1970年   1篇
  1969年   2篇
  1967年   1篇
  1963年   1篇
排序方式: 共有1441条查询结果,搜索用时 15 毫秒
991.
Shipwrecks are resource rich. The recent Gulf of Mexico Deep Gulf Wrecks Project was meant to be shared and explored, not only by professional scientists but also by the public. The project website was the public link to the deepest reaches of the Gulf of Mexico during the scientific expedition. The website welcomed hundreds of visitors each day during the project. The audience composed of professionals and interested public followed the daily logs and videos. The overall scientific and educational data sets amassed from the project were, at times, overwhelmingly vast, but when segmented by topic, became manageable. After the fanfare generated by following along with the expedition ended, the primary project goals shifted to analysis and the creation of a lasting educational legacy. This legacy is presented digitally via the web. Project curriculum gives classrooms around the globe long-term access to the exciting scientific data. Along with the documentary film project the Deep Gulf Wrecks Project ensures that the legacy at the bottom of the Gulf of Mexico is indeed a lasting legacy.  相似文献   
992.
Ethics based on Confucian moral virtues and guides as core values have long formed the “old tradition” in determining the direction of China’s social development. Changes of urban residents’ values and corresponding changes in life styles in late Ming Dynasty demonstrated the emergence of a new cultural tradition that advocated for human freedom and the development of individuality, material enjoyment and pleasures in life, and questioned and critiqued Confucian moral virtues and guides. Although such a cultural tradition had not yet matured, its humanist values made deep imprints in that period. This tradition survived despite of the successions of dynasties and vicissitudes of the ages, although from time to time it became so weak as on the verge of extinction. It was this continuous and unceasing cultural progress that later laid the primitive but essential cultural foundation for the start of China’s efforts to achieve modernization after the middle of the 19th century.  相似文献   
993.
When survivors from the Ravensbrück concentration camp arrived in Sweden in spring 1945, some of the objects they brought with them from the camp were collected and preserved. These are modest in appearance, but were – as oral testimonies show – invaluable in camp. The concentration camp context of obliteration stretches the limits of interpretation of material culture to its extreme. In this article the objects are discussed as expressions of resistance, memory, and identity. These immaterial values were among the most vital coping strategies used by the prisoners against the dehumanization laid upon them by the camp administration. The material culture was central in enabling, upholding, and realizing these.  相似文献   
994.
We present the detailed analysis of a cervical vertebra from a cave bear, found at Pe?turina cave, Serbia, in a Mousterian archaeological level dated by radiocarbon at 43.5–44.6 kyr cal BP, and by ESR to between 93.5 and 102.5 kyr BP. Identified as a portion of the cranial articular facet, the fragment displays ten subparallel grooves. The microscopic study of these grooves and other surface modification present on the bone fragment, conducted with multifocus optical and confocal microscopes and complemented by a taphonomic analysis of the associated faunal assemblage, supports the hypothesis that the incisions were made by humans. Results are used to critically examine ambiguities implicit in the analysis and interpretation of early engravings, a category of material culture that has been playing a key role in the identification of early instances of symbolically mediated behavior.  相似文献   
995.
996.
The use of 3D data in the analysis of skeletal and fossil materials has conveyed numerous advantages in many fields; however, as the availability and use of 3D scanning equipment are rapidly increasing, it is important for researchers to consider whether these methods are suitable for the proposed study. The issue of suitability has been largely overlooked in previous research; for instance, casts and reconstruction methods are frequently used to increase sample sizes, without sufficient assessment of the effect, this may have on the accuracy and reliability of results. Furthermore, the reliability of geometric morphometric methods and the implications of virtual curation have not received sufficient consideration. This paper discusses the suitability of 3D research with regard to the accuracy, reliability, and accessibility of methods and materials, as well as the effects of the current learning environment. Areas where future work will progress 3D research are proposed.  相似文献   
997.
The finding of a male red deer (Cervus elaphus L.) skeleton at Brandýs nad Labem (Central Bohemia, Czech Republic) dated to the Únětice culture (Early Bronze Age), radiocarbon dated to 1881–1679 cal BC (P 93 %), unique in the region, was analysed archaeozoologically. The depositing of a whole, unbutchered and entirely undamaged, but curled up body of a stag in a relatively small pit dug into the bottom of a large storage pit undoubtedly had some kind of special meaning or significance. It is interpreted as the burial of a ritually sacrificed beast. The deer male aged 2.5–3 years, with a withers height ca 129 cm, was in good health and had well-developed antlers. The stag most probably died between January and April, probably more towards the spring, but exactly how it died is unclear. The ritual appears to have been quite complex since it included a fire at the bottom of the storage pit. Deposition in a place designed for storage could suggest a ceremony relating to a sacrifice for prosperity and a good harvest. Despite a lack of evidence for the use of deer in rituals and the symbolic sphere during the Bronze Age, deer burials and the symbolic significance of the stag are known from other archaeological cultures and ethnicities. Interestingly, the entire foreleg of a younger red deer (aged 4–7 months), an isolated humerus of another young fawn (0.5–2 months) and the remains of two dog puppies (3.5–4.5 months) were present in upper horizons of the storage pit, which could also have a special meaning.  相似文献   
998.
Building on the important work of Lyn Wadley at Sibudu, archeologists from the University of Tübingen have excavated the upper stratigraphic units of the Middle Stone Age (MSA) sequence down to the Howiesons Poort (HP). Here, we present the main results from lithic analyses of the lowest part of the Sibudan sequence to assess its overall variability and taxonomic status. Based on the new findings, we also discuss the implications for archeological systematics and the cultural evolution of modern humans in MIS 3 from a more general perspective. The Sibudan deposits encompass over 20 archeological horizons that span a 1.2-m-thick, well-stratified sequence whose base and top have been dated to ~58 ka (MIS 3). In contrast to the upper stratigraphic units, the lower Sibudan assemblages that we analyzed here show much higher use of local sandstone, quartz, and quartzite. These older units are characterized by frequent use of expedient core reduction methods, bipolar reduction of locally available quartz and quartzite, less retouch of blanks, and lower find densities. Tongati and Ndwedwe tools, which feature abundantly in the upper part of the Sibudan sequence, are entirely absent, as are unifacial points. Instead, notched and denticulated tools are common. Surprisingly, knappers manufactured small bifacial points, mainly made from quartz, by means of alternating shaping in the course of the oldest occupations. The results highlight the great diversity of human technological behavior over even short periods during the MSA, raising important questions about the mechanisms of behavioral change, cultural taxonomy, appropriate scales of lithic analyses, and the relationship between the HP and the Sibudan. Our findings further erode the old idea that bifacial technology in southern Africa is limited to the Still Bay. Research is increasingly showing that bifacial points come and go in different forms and contexts of African Late Pleistocene technology, impeding their use as chrono-cultural markers.  相似文献   
999.
Myanmar has been notably underrepresented in recent studies of archaeometallurgy in Southeast Asia, despite its richness in both mineral and cultural resources and its potentially central role in long-distance exchange networks linking India, China and peninsular neighbours. Here, we present original analytical data on copper-base artefacts from several Bronze Age and Iron Age sites in Myanmar. Observed microstructures range from as-cast, worked, to fully annealed; compositions include leaded copper, low-tin to high-tin bronzes, and arsenical copper/bronze. Lead isotope analyses indicate that the metal originates from different geological sources, including several that match the lead isotope signatures of known prehistoric copper mines in Thailand and Laos. These archaeometallurgical data, including evidence for secondary copper-base production, more than double those currently available for Myanmar and document the presence of multiple local alloying and working traditions, perhaps chronologically differentiated, as well as identifying possible links to primary mineral sources across the region. Overall, this adds significant new information to the emerging picture of Southeast Asian prehistoric metallurgy at the crossroads of several major ancient cultures.  相似文献   
1000.
Lavishly decorated wagons excavated from royal Xiongnu burials are generally regarded as tribute items from China offered to Xiongnu elites, symbolizing important political and economic interactions between the Xiongnu state (209 BC–155 AD) and the Han dynasty (206 BC–220 AD). This theory views such vehicles as having no relation to indigenous Xiongnu craftsmanship. Furthermore, specialized products delivered to the northern nomadic peoples from the Han state are often cited in support of the notion of Xiongnu dependency on foreign states for technological and political development. Expecting to find evidence of China’s traditional iron and bronze technology, we examined a number of key metallic components of these wagons excavated from the royal Xiongnu burial at Golmod 2 in central Mongolia, radiocarbon dated to 109 BC–AD 75. Surprisingly, the iron metallurgy in question was based primarily on the bloomery process while low tin bronze and arsenical copper alloys dominated the pertinent bronze production. These respective technological traditions are typical of Xiongnu manufacture but significantly different from traditional Han metallurgy. We interpret this evidence as suggesting the need for a more balanced evaluation of foreign influence on the rise and development of the Xiongnu state.  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