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   9038篇
  免费   110篇
  9148篇
  2020年   106篇
  2019年   128篇
  2018年   436篇
  2017年   381篇
  2016年   454篇
  2015年   178篇
  2014年   160篇
  2013年   1997篇
  2012年   223篇
  2011年   394篇
  2010年   391篇
  2009年   244篇
  2008年   256篇
  2007年   229篇
  2006年   154篇
  2005年   135篇
  2004年   118篇
  2003年   83篇
  2002年   88篇
  2001年   117篇
  2000年   109篇
  1999年   104篇
  1998年   78篇
  1997年   89篇
  1996年   65篇
  1995年   70篇
  1994年   69篇
  1993年   83篇
  1992年   76篇
  1991年   81篇
  1990年   63篇
  1989年   70篇
  1988年   61篇
  1987年   90篇
  1986年   61篇
  1985年   95篇
  1984年   91篇
  1983年   109篇
  1982年   82篇
  1981年   87篇
  1980年   95篇
  1979年   78篇
  1978年   82篇
  1977年   107篇
  1976年   95篇
  1975年   79篇
  1974年   70篇
  1973年   62篇
  1972年   57篇
  1971年   53篇
排序方式: 共有9148条查询结果,搜索用时 15 毫秒
81.
A meeting of the Advisory Panel on a major research project entitled “Soviet Environmental Policies and Practices: Most Critical Investment Priorities” was convened in Glasgow, Scotland on March 12 and 13, 1988. More than a dozen specialists from Britain, West Germany, and the United States participated. The meeting was hosted by the Institute of Soviet and East European Studies of Glasgow University. The results are summarized below.  相似文献   
82.
The establishment of a new ethnos, or ethnic community, is attributed to a burst of energy or an innate drive that enables members of the community to break with past traditions and behavioral patterns and to begin building a new set of values distinguishing the new ethnic group from others. The ethnos is viewed as both a social and a biological phenomenon, with the social aspect represented by the group's relations with other groups and institutions and the biological by the behavior of the ethnos as a biological population. The innate drive exhibited by ethnic groups in the early stage of ethnogenesis is viewed as a biological feature. In general this drive is fostered by the practice of endogamy, but there are situations in which an ethnically mixed community, resulting from exogamy, also generates the energy required to initiate the process of ethnogenesis. Although the existence of the ethnic drive can be demonstrated by reference to history and historical geography, an explanation of this form of energy must be left to genetics and anthropology.  相似文献   
83.
Limiting environmental conditions in the construction of industrial nodes in the new oil district of the Middle Ob' are the rigorous climate, extensive swamp cover and absence of ground transportation. These adverse factors are compensated to some extent by the shallow depth of oil deposits, favorable geology and the availability of groundwater that can be injected to maintain oil-reservoir pressures. The basic problems in the development of the oil district are the shortage of housing, services and local foodproducts and consumer goods as well as the high cost of construction of transport routes. Greater investment in services is urged to help reduce the high turnover of labor as migrants are reluctant to settle permanently in the region.  相似文献   
84.
This object-specific case study focuses on cupreous artifacts excavated from the Great Temple complex of Petra, Jordan to demonstrate how the use of compositional X-ray analyses alongside two experimental applications (ImageJ software and nanoindentation) have the potential to generate different and otherwise unobtainable information about archaeological metals. The study highlights the value of using multiple techniques as a means of resolving the ambiguities that tend to arise from interpretations of single-sited measurements on objects and from single-instrumental analyses during studies of production processes and consequent material performance. Employing different techniques on multiple localities within a sample permits the gathering of precise information about the behavior of and interrelationships between variables that affect the objects’ fabrication and use, particularly composition, structure, and hardness properties. The resulting data are interpreted in association with contextual archaeological information from Petra to consider the use-life and potential significance of these objects.  相似文献   
85.
Richards et al. (2000) reconstructed the diet of the human remains found in Gough's and Sun Hole Cave through isotope analysis. They concluded that these people consumed an entirely terrestrial-based diet. Their reconstruction was based upon comparison of the results from human bones with those from a very small number of associated animals. The diets of the Gough's and Sun Hole Cave human were different from the other six Upper Palaeolithic humans from the British Isles for which dietary information has been obtained through isotope analysis. The work of Richards et al. (2000) suggests that they were the only ones for whom marine or freshwater resources did not play a significant role in their diets. We test this through further analyses of faunal remains from Gough's Cave, Sun Hole and other contemporary sites (Kent's Cavern, Aveline's Hole, Kendrick's Cave). Despite the limited faunal sample, the original palaeodietary reconstruction is broadly consistent with our findings. The isotope values of the main protein sources consumed by the humans from both sites are consistent with those of red deer and bovines, and, for a single individual, with that of horse and red deer. Reindeer was postulated in the original reconstruction as a potential food source, but this seems very unlikely based on our isotope reconstruction and the archaeological remains.  相似文献   
86.
Some radiocarbon dates for ancient Egypt have been significantly offset from the established historical chronology (see Bonani et al., 2001). In this paper, short-lived plant species collected in Egypt between 1700 and 1900 AD were used to investigate the possibility that the radiocarbon record had been influenced by reservoir effects. AMS radiocarbon measurements were made on 66 known-age samples, resulting in an average offset from expected values of 19 years. The implications of this minor discrepancy on the likelihood of a reservoir process are discussed, and the agreement of the data with recent models of radiocarbon seasonality is also considered.  相似文献   
87.
Umhlatuzana Rock Shelter is a long-sequence Middle and Later Stone Age site in KwaZulu-Natal, South Africa. Jonathan Kaplan excavated the site and analysed the material in the 1980s as a rescue project. For many years thereafter the collection remained untouched, partly because of doubts raised about the stratigraphic integrity of the site. Using single-grain OSL dating we show that post-depositional mixing of sediment was restricted to time-specific, small-scale events. The OSL ages obtained for the Howiesons Poort and pre-Howiesons Poort are comparable to those of other southern African sites with unambiguous Howiesons Poort and Still Bay Industries. Based on morphological and other characteristics, we reason that the Still Bay is represented at Umhlatuzana, and announce the presence of a serrated point assemblage closely associated in time with the Still Bay points.  相似文献   
88.
Historical archaeology as practiced in Scotland is divergent from the mainstream tradition of historical archaeology/post-medieval archaeology that dominates North America and the English-speaking world. Cultural and historical forces have shaped an historical archaeology with a deeper time depth, which extends back into the Middle Ages. It also focuses on different subjects reflecting the political concerns associated with Scottish national identity. Examples drawn from Glasgow’s history are used to illustrate the distinctiveness of the Scottish tradition and how it is evolving. I argue that one of its strengths of Scottish historical archaeology is that it provides a corrective contrast to the subjects and approaches which dominate historical archaeology in the English-speaking world.  相似文献   
89.
The Mornington Island Mission in the Gulf of Carpentaria, Australia, was a site of historical engagement between Aboriginal people and missionaries. In this paper, we apply the theoretical concepts of “domains” and the “intercultural” to the investigation of this engagement between 1914 and 1942, when the mission was overseen by the Reverend Robert Wilson. Through the examination of the removal of Aboriginal children, the establishment of a mission compound and Aboriginal camp and the inclusion of Aboriginal adults into the mission compound through production and economy, we show how mutually constituted domains operated. At the same time, the interaction between Aboriginal adults and children with missionaries within these domains was increasingly intercultural in nature. Thus, both “domains” and the “intercultural” are shown to have relevance to the historical case study.  相似文献   
90.
Scrutinising prey choice allows the testing of hypotheses on whether the hunting capabilities of Middle Stone Age (MSA) people were as sophisticated as those of Later Stone Age hunter–gatherers. I apply an optimal foraging perspective to investigate whether MSA prey choice was constrained by the danger associated with hunting certain species. Here, I study the relative importance of elands, buffalo and suids. Eland was the most attractive prey to hunter–gatherers because it is large and docile. Buffalo and suids are more aggressive. When additional species to eland needed to be exploited, we would expect unsophisticated hunters to prefer the smaller suids over buffalo. If hunting prowess was sufficient to deal with both buffalo and suids, buffalo should be preferred. Due to their size, exploitation of buffalo would be more profitable than exploitation of suids. I show that, taking environmental circumstances into account, buffalo were preferred to suids, suggesting that MSA people were capable, sophisticated hunters.  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