全文获取类型
收费全文 | 2284篇 |
免费 | 67篇 |
出版年
2021年 | 9篇 |
2020年 | 15篇 |
2019年 | 27篇 |
2018年 | 147篇 |
2017年 | 125篇 |
2016年 | 136篇 |
2015年 | 35篇 |
2014年 | 32篇 |
2013年 | 524篇 |
2012年 | 77篇 |
2011年 | 138篇 |
2010年 | 117篇 |
2009年 | 71篇 |
2008年 | 67篇 |
2007年 | 126篇 |
2006年 | 51篇 |
2005年 | 34篇 |
2004年 | 19篇 |
2003年 | 15篇 |
2002年 | 17篇 |
2001年 | 18篇 |
2000年 | 15篇 |
1999年 | 26篇 |
1998年 | 11篇 |
1997年 | 14篇 |
1996年 | 17篇 |
1995年 | 15篇 |
1994年 | 11篇 |
1993年 | 19篇 |
1992年 | 15篇 |
1991年 | 21篇 |
1989年 | 9篇 |
1988年 | 14篇 |
1987年 | 18篇 |
1986年 | 23篇 |
1985年 | 17篇 |
1984年 | 16篇 |
1983年 | 19篇 |
1982年 | 23篇 |
1981年 | 19篇 |
1980年 | 14篇 |
1979年 | 15篇 |
1978年 | 14篇 |
1977年 | 13篇 |
1976年 | 15篇 |
1975年 | 15篇 |
1973年 | 11篇 |
1970年 | 9篇 |
1969年 | 11篇 |
1967年 | 15篇 |
排序方式: 共有2351条查询结果,搜索用时 15 毫秒
91.
J. Petřík D. Sosna L. Prokeš D. Štefanisko P. Galeta 《Archaeological and Anthropological Sciences》2018,10(4):893-904
Despite the large-scale expansion of Bell Beaker phenomenon, there is a tension between the normative Bell Beaker material culture categories and their local objectification in the form of real artefacts. Stone projectile points provide an opportunity to evaluate how much was the general category of such a point influenced by regional and local factors. The aim of this paper is to explore shape and size variation of Central European Bell Beaker projectile points from Moravia (Czech Republic) to elucidate factors responsible for this variation. The sample consists of 194 projectile points from 54 Central European Bell Beaker sites (2500–2300/2200 BC) distributed in Morava River catchment. The size and shape of projectile points were studied by landmark-based geometric morphometrics and expressed as shape groups, which have been assessed in terms of their spatial distribution, raw material, and reutilization. Although several shape categories of points were identified, there is a strong degree of uniformity in the research sample. The dominant shape category (75.4 % of points) was pervasive across geographic space and was not significantly affected either by raw material or reutilization. A lower degree of reutilization of points is interpreted as a consequence of a non-utilitarian role of projectile points, which represented a critical component of Bell Beaker mortuary practices. 相似文献
92.
Mark A. Hill Mark F. Seeman Kevin C. Nolan Laure Dussubieux 《Archaeological and Anthropological Sciences》2018,10(5):1193-1205
In prehistoric North America, artifacts of copper occupy a position of prominence in the Hopewell societies of Ohio’s Scioto Valley. These artifacts also represent the social contacts and long-distance interactions that brought copper to the Scioto Valley. Yet, our understanding of Hopewell copper acquisition, and the movement of copper artifacts within the social networks of the Scioto Valley and beyond, has been limited due to the limited availability of geochemical data concerning provenance and variability. We begin to develop the foundation for understanding these important social issues by analyzing the elemental variability of Hopewell copper through the use of laser ablation inductively coupled plasma mass spectrometry. We analyze 24 samples from four known copper source regions and 52 samples from 6 prominent sites in the Scioto Valley. Results suggest that a majority of the artifacts are consistent with sources in the Great Lakes, with a plurality classified as Isle Royale. However, 21% of Scioto Hopewell copper artifacts were most consistent with southern Appalachian sources. High elemental variability argues against simple models of copper acquisition and suggests that different social groups had access to a variety of copper sources through varying social networks. Native copper regardless of source seems to have been channeled along similar social and symbolic pathways. Our results suggest that instead of being derived from the struggle to access a specific source, value is derived from the social relationships represented by the copper and the connotation of exotic connection embodied in both style and material. 相似文献
93.
Seyedeh M. Kazzazi Elena F. Kranioti 《Archaeological and Anthropological Sciences》2018,10(2):439-448
Sex estimation of skeletal remains is one of the major components of forensic identification of unknown individuals. Teeth are a potential source of information on sex and are often recovered in archaeological or forensic contexts due to their post-mortem longevity. Currently, there is limited data on dental sexual dimorphism of archaeological populations from Iran. This paper represents the first study to provide a dental sex estimation method for Iron Age populations. The current study was conducted on the skeletal remains of 143 adults from two Iron Age populations in close temporal and geographic proximity in the Solduz Valley (West Azerbaijan Province of Iran). Mesiodistal and buccolingual cervical measurements of 1334 maxillary and mandibular teeth were used to investigate the degree of sexual dimorphism in permanent dentition and to assess their applicability in sex estimation. Data was analysed using discriminant function analysis (SPSS 23), and posterior probabilities were calculated for all produced formulae. The results showed that incisors and canines were the most sexually dimorphic teeth, providing percentages of correct sex classification between 86.4 and 100 % depending on the measurement used. The combination of canines and other teeth improved significantly the level of correct sex classification. The highest percentages of sex classification were obtained by the combination of canines and incisors (100 %) and canines and molars (92.3 %). The present study provided the first reference standards for sex estimation using odontometric data in an Iranian archaeological population. Cervical measurements were found to be of value for sex assessment, and the method presented here can be a useful tool for establishing accurate demographic data from skeletal remains of the Iron Age from Iran. 相似文献
94.
95.
N. Noe-Nygaard 《Journal of archaeological science》1983,10(4):317-325
A vertebra of a Brown Bear (Ursus arctos) is described from the Mesolithic settlement Star Carr. This is the first record of the species from the site. The presence of Brown Bear in a Preboreal/Boreal deposit is an important addition to the early Mesolithic fauna of Britain. A comparison with contemporary Danish material shows that the bone from Star Carr falls within the wide size range of the Danish subfossil Brown Bear. In Denmark the species decreases in number from Boreal to Atlantic time, and finds are extremely scarce in Britain during the same time interval. This is probably due to the major eustatic sea level rise, which isolated Britain and Sjælland, preventing new immigration, and to vegetational changes restricting the preferred habitats of the Brown Bear. 相似文献
96.
97.
Assessing Socio‐Economic Vulnerability to Climate Change Impacts and Environmental Hazards in New South Wales and Queensland,Australia
下载免费PDF全文
![点击此处可从《Geographical Research》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This article systematically reviews and synthesises academic, peer‐reviewed literature to assess the state of knowledge concerning socio‐economic vulnerability to climate change impacts and environmental hazards in New South Wales and Queensland, Australia. It focuses upon empirical research that identifies socio‐economic factors associated with vulnerable subpopulations. Using systematic review methods, 35 articles met the inclusion criteria. These articles are analysed according to their general characteristics, the methods used, and the factors reported to be associated with socio‐economic vulnerability. This body of evidence reveals that (1) the majority of the knowledge about socio‐economic vulnerability in New South Wales and Queensland has only recently emerged; (2) more knowledge has been published about Queensland; and (3) extreme temperature is the most researched environmental hazard. Despite increased research activity over time, the number of factors repeatedly demonstrated to influence socio‐economic vulnerability is small. Age, gender, place of residence, and pre‐existing illness were the most commonly reported factors, although the influence of these factors upon socio‐economic vulnerability is complex. There is scope to extend the empirical research base across a broader range of climate‐related hazards and to better link findings from the domains of climate change vulnerability and population health. 相似文献
98.
99.
A Box Containing Carpenter's Accessories from The Akko 1 Shipwreck,Israel: Archaeometallurgical Analysis of Surviving Ironwork
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)
The Akko 1 shipwreck was an Egyptian armed vessel, built at the beginning of the 19th century. A wooden saw handle and a box containing iron nails and two split pins were discovered towards the stern. Given their function, location and context, these were part of the ship's carpenter's tools and accessories. A methodology was developed for conducting systematic metallurgical analysis in order to understand the manufacturing process of the surviving ironwork items, as well as to enlarge our knowledge regarding ironworking technologies during the early 19th century. Such methodology may assist in the future understanding of the technological evolution of similar wrought‐iron objects. The results demonstrated that the artefacts have a wrought‐iron heterogeneous microstructure and were manufactured by hot‐working prior to surface hardening by pack carburization. 相似文献
100.
Mapungubwe (AD 1220–1290) is generally regarded as the first urban centre in southern Africa, functioning as the seat of power for an extensive but short-lived polity. More than 80 years of excavations here, and at its nearby predecessor K2 (c. AD 1000–1220), resulted in a substantial assemblage of material remains from elite and commoner contexts. This assemblage includes a large collection of worked bone objects, such as needles, awls, tubes and objects of personal adornment. Of particular interest are the bone arrowheads and link-shafts, of which a significant number of specimens were found complete and intact. Such quantities of well-preserved worked bone objects are unique in the archaeological record of the region. The worked bone assemblages from these two sites provide a rare opportunity to study multiple components of the production process as well as the use context of bone objects. In this paper, we characterise the K2 and Mapungubwe worked bone industries through various morphological, technological, use-trace and contextual approaches and discuss the significance of these aspects in terms of raw material selection and manufacture and archaeological use context. In particular, this study shows the complexity of these worked bone industries over time. 相似文献