全文获取类型
收费全文 | 3706篇 |
免费 | 90篇 |
出版年
2020年 | 39篇 |
2019年 | 51篇 |
2018年 | 46篇 |
2017年 | 72篇 |
2016年 | 68篇 |
2015年 | 53篇 |
2014年 | 59篇 |
2013年 | 1256篇 |
2012年 | 60篇 |
2011年 | 80篇 |
2010年 | 66篇 |
2009年 | 61篇 |
2008年 | 59篇 |
2007年 | 57篇 |
2006年 | 47篇 |
2005年 | 41篇 |
2004年 | 45篇 |
2003年 | 44篇 |
2002年 | 34篇 |
2001年 | 44篇 |
2000年 | 52篇 |
1999年 | 84篇 |
1998年 | 56篇 |
1997年 | 41篇 |
1996年 | 41篇 |
1995年 | 31篇 |
1994年 | 38篇 |
1993年 | 36篇 |
1992年 | 31篇 |
1990年 | 37篇 |
1989年 | 36篇 |
1988年 | 29篇 |
1987年 | 43篇 |
1986年 | 34篇 |
1985年 | 43篇 |
1984年 | 48篇 |
1983年 | 57篇 |
1982年 | 49篇 |
1981年 | 35篇 |
1980年 | 61篇 |
1979年 | 44篇 |
1978年 | 45篇 |
1977年 | 52篇 |
1976年 | 41篇 |
1975年 | 49篇 |
1974年 | 39篇 |
1973年 | 26篇 |
1970年 | 35篇 |
1969年 | 27篇 |
1967年 | 27篇 |
排序方式: 共有3796条查询结果,搜索用时 0 毫秒
951.
This paper presents a pilot study designed to test the use of oxygen isotopes for investigating aspects of early herding practices in the Neolithic of western Asia, using the site of Çatalhöyük in central Anatolia as a case study. Time‐sequenced δ18O values in dental enamel of archaeological sheep are assessed for post‐depositional diagenetic effects and compared with seasonal δ18O meteoric water values in the region today. The evidence is used to indicate the environmental conditions in which individual sheep spent their first year, enabling management of breeding and birthing seasons, and movement to seasonal pastures, to be investigated. 相似文献
952.
953.
954.
The provenance of Early Bronze Age and early Middle Bronze Age pottery produced between 2100 and 1970 B.C. and excavated from Kaman-Kalehöyük, Turkey was studied using mineralogical methods, including heavy mineral analysis and geochemical study of individual hornblende grains. The relative abundances of heavy minerals in the fabrics of 20 Early Bronze Age (EBA) and early Middle Bronze Age (MBA) pottery sherds, together with 27 local sediments collected within a radius of 25 km of the site were studied. The heavy mineral distributions in the Kaman region were statistically analyzed for consistencies in their occurrence. Amphibole was found to be the most abundant heavy mineral in most of the analyzed samples, followed by titanite and epidote. The amounts of other minerals such as garnet, clinopyroxene, and zircon are subordinate. Different proportions of heavy minerals in the fabrics allow categorization of the EBA and early MBA potteries into 5 groups. Comparative study of heavy mineral assemblages of local sediments and pottery suggests that half of the EBA and most of the MBA potteries were produced from sediment near the excavation site, whereas the other half of the EBA potteries were produced from sediment occurring at 25 km east or more east of the site. The geochemistry of individual amphibole grains was studied by electron-microprobe analysis. Most of the studied amphibole grains are calcic and aluminous, corresponding to hornblende. They can be further characterized into four types based on their chemical composition. The combination of heavy mineral identity and hornblende geochemistry provides diagnostic evidence for the origins of Kaman-Kalehöyük pottery. These and analogous heavy mineral techniques are effective archaeometric tools for determining pottery provenance. 相似文献
955.
956.
The development of agriculture is closely associated with the domestication of wheat, one of the earliest crop species. During domestication key genes underlying traits important to Neolithic agriculture were targeted by selection. One gene believed to be such a domestication gene is NAM-B1, affecting both nutritional quality and yield but with opposite effects. A null mutation, first arisen in emmer wheat, decreases the nutritional quality but delays maturity and increases grain size; previously the ancestral allele was believed lost during the domestication of durum and bread wheat by indirect selection for larger grain. By genotyping 63 historical seed samples originating from the 1862 International Exhibition in London, we found that the ancestral allele was present in two spelt wheat and two bread wheat cultivars widely cultivated at the time. This suggests that fixation of the mutated allele of NAM-B1 in bread wheat, if at all, occurred during modern crop improvement rather than during domestication. We also discuss the value of using archaeological and historical plant material to further the understanding of the development of agriculture. 相似文献
957.
Carolyn C. Szmidt Christian Normand George S. Burr Greg W.L. Hodgins Sarah LaMotta 《Journal of archaeological science》2010
This paper presents new AMS radiocarbon dating results of six ungulate bones from the current excavation of Isturitz Cave, France, layer C 4c4. The assemblage from this layer exhibits a suite of traits closely aligned with the Early Aurignacian, but with some aspects that bear strong similarities with the Protoaurignacian, with possible in situ technological transformation. Accurate and precise dating of the late Middle Palaeolithic and the early Upper Palaeolithic periods is critical to our understanding of the possible relationship between final Neanderthals and early modern humans in Europe. As such, a rigorous set of sample selection and evaluation protocols was developed and used in this research. Among these, only cutmarked bones were selected and a total of 31 targets were made, giving a weighted average of 37,180 ± 420 BP for this assemblage and providing a terminus ante quem for the ornaments, decorated artefact and amber pendants beneath it. The implications and importance of these results to debates concerning the chronological relationship between the Châtelperronian, Protoaurignacian and Early Aurignacian and associated debates regarding hominin dispersal, interaction and the timing of technical and cultural innovations are discussed. 相似文献
958.
Policy-makers from many regions where old industrial structures in the field of manufacturing have collapsed are trying to stimulate entrepreneurial activities of businesses in the cultural industry. The question is whether this strategy could be successful. This article examines the strategy of supporting the sector of media industry (“MI”) by policy-makers in the region of Halle in East Germany, where a strong de-industrialization has taken place after the German reunification. Stimulated by the policy-makers' support measures, there actually was a remarkable development of MI. However, the number of MI firms and their employees did not further increase in recent years, after having reached a certain level. This illustrates the limits of political measures for turning a city's path of industrial development voluntarily. 相似文献
959.
Barney G. Bartelle René L. Vellanoweth Elizabeth S. Netherton Nicholas W. Poister William E. Kendig Amira F. Ainis Ryan J. Glenn Johanna V. Marty Lisa Thomas-Barnett Steven J. Schwartz 《Journal of archaeological science》2010
To date more intact dog remains have been found on San Nicolas than on any of the other seven California Channel Islands. However, little is known about them. During the 2007 summer field season we excavated a medium sized young male dog in a flexed burial position from a pit at CA-SNI-25, a large Native American village site. The dog exhibits hypodontia, noticeable tooth attrition, severe scapular trauma, and vertebral, rib, and phalanx pathologies. Most of the injuries appear to have resulted from a severe blunt force trauma of unknown origin and it is likely the dog would not have survived without human care. The results of our analysis contribute to the, somewhat limited, published data on archaeological dogs in California. In this paper we describe the biological characteristics of the dog especially his anomalies and pathologies and compare them with published reports of other North American archaeological dogs with similar conditions. 相似文献
960.
Indices of taxonomic abundance are commonly used by zooarchaeologists to examine resource intensification, overexploitation and gender-divisions in foraging labor. The original formulation of abundance indices developed a clear interpretive framework by linking the measure with foraging models from behavioral ecology. However, using the same basic tenets of behavioral ecology, archaeologists disagree about how to interpret variability in abundance index values: some suggest that high proportions of large prey remains represent higher overall foraging efficiency, while others argue the opposite. To help solve this problem, we use quantitative observational data with Martu hunters in Australia’s Western Desert to examine how foraging decisions and outcomes best predict variation in the abundance index values that result. We show that variation in the proportional remains of large to small game is best predicted by hunting bout success with larger prey and the time spent foraging for smaller prey. A declining abundance index results from decreasing hunting success with larger prey, increasing time invested in hunting smaller prey, or both; any of which result in a lower overall return rate than if large prey were acquired reliably. We also demonstrate that where large prey acquisition is stochastic, high index values are correlated positively with men’s proportional caloric contribution of large unreliable game, while low index values are correlated with women’s proportional foraging time for small reliable game. We discuss these results with reference to evidence of resource intensification and gender-specific foraging. 相似文献