全文获取类型
| 收费全文 | 2168篇 |
| 免费 | 108篇 |
专业分类
| 2276篇 |
出版年
| 2021年 | 43篇 |
| 2020年 | 42篇 |
| 2019年 | 227篇 |
| 2018年 | 160篇 |
| 2017年 | 145篇 |
| 2016年 | 150篇 |
| 2015年 | 141篇 |
| 2014年 | 142篇 |
| 2013年 | 273篇 |
| 2012年 | 155篇 |
| 2011年 | 143篇 |
| 2010年 | 119篇 |
| 2009年 | 70篇 |
| 2008年 | 95篇 |
| 2007年 | 76篇 |
| 2006年 | 51篇 |
| 2005年 | 48篇 |
| 2004年 | 39篇 |
| 2003年 | 38篇 |
| 2002年 | 30篇 |
| 2001年 | 38篇 |
| 2000年 | 36篇 |
| 1999年 | 4篇 |
| 1998年 | 4篇 |
| 1996年 | 1篇 |
| 1991年 | 1篇 |
| 1990年 | 1篇 |
| 1985年 | 1篇 |
| 1983年 | 1篇 |
| 1978年 | 2篇 |
排序方式： 共有2276条查询结果，搜索用时 15 毫秒
991.
Normal fusion of the acromion process in humans begins at about age 15 and should complete ossification by age 22–25. Os acromiale occurs when fusion of the acromial epiphysis does not follow its normal ossification pattern, resulting in the retention of a separate epiphyseal end to the acromial process. Depending on how the metaphyseal junctures fuse, differential size and shape of the unattached acromial segment is produced. As a result of shoulder anatomy and the mobile epiphysis, os acromiale is associated with shoulder impingement and rotator cuff problems. The purpose of this study is to document the frequency of os acromiale in the Robert J. Terry Collection and gain a perspective on the occurrence of os acromiale in this specific US population. The overall frequency of os acromiale in the sample of 1594 skeletons was 8.34%. This study also evaluates the prevalence of os acromiale between sexes and ancestral groups in the Terry Collection. Significant frequency differences in the expression of os acromiale were found between both ancestry and sex; the black male sample has the highest frequency (12.47%), with a lower occurrence in the black female sample (9.22%). The white sample exhibited observably lower frequencies, with the white males at 6.8%, and white females at 3.2%. Size and shape and side expression (laterality) showed no significant differences between the sexes. However, significant differences in laterality by ancestry were observed; black males exhibited 48.3% bilateral expression, while white males exhibited bilateral expression only 29% of the time and 54.8% had a right lateral expression. Based on the results presented in this study, it is suggested that there is a genetic causation for os acromiale, which may or may not be exacerbated by physical activity. The use of this anomaly as an additional non‐metric feature in inferring familial relationships and personal identification is discussed. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
992.
K. J. Reinhard J. R. Ambler C. R. Szuter 《International Journal of Osteoarchaeology》2007,17(4):416-428
Faunal remains are commonly found in coprolites and provide direct evidence of animal consumption. An evaluation of hunter‐gatherer coprolites from the Southwest US shows that animal bone in coprolites can be used to assess patterns of hunting, food preparation, and general importance of small animals in diet. This is demonstrated by a comparison of faunal assemblages between two hunter‐gatherer sites with respect to small animal hunting strategies. The sites are Dust Devil Cave on the Colorado Plateau, an Archaic winter habitation, and Hinds Cave, a warm season Archaic habitation in the lower Pecos of Texas. The results indicate that small animal hunting varied regionally and seasonally. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
993.
It has long been recognised that cattle horn‐cores are sexually dimorphic, and many methods have been developed using archaeological material for differentiating between specimens belonging to cows, bulls and oxen. Whilst these techniques have been adopted widely by zooarchaeologists, in particular those studying medieval and post‐medieval tannery and horn‐working assemblages, they are highly subjective and their reliability has never been tested using material from cattle of known sex. This paper seeks to redress the balance. It presents the results of a study of 19th and 20th century cattle horn‐cores, from animals of known age, sex and breed, which were examined and measured in order to test the validity of traditional horn‐core sexing techniques. Previously claimed traits of sexual variation are here refuted, and a new metrical threshold for separating the males and females of ‘medium‐horned’ and ‘long‐horned’ types are presented. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
994.
T. P. O'Connor 《International Journal of Osteoarchaeology》2007,17(6):581-595
Investigation of modern biometric data indicates that it may be possible to distinguish wildcats from house cats in many instances. Applying the log‐ratio (log‐difference) technique to archaeological samples from medieval northern Europe, and to mixed samples of wildcats and house cats, shows that the differentiation may not always be clear, and the possibility that some samples include hybrids is discussed. The technique is applied to samples from the Orkney Islands to demonstrate that single wildcat specimens can be identified in small samples. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
995.
Lake Nuga Nuga is a levee‐dammed lake in the dry sub‐humid tropics of the Fitzroy Basin in Central Queensland, Australia, that has expanded significantly since it was first mapped in 1866. 210Pb dating of a sediment core from the lake indicates that the rate of sedimentation has been constant for the past 67 years at 3 mm yr?1 despite widespread clearing and land use intensification in the catchment during that time. Pollen analysis confirms this and shows that there was little change in vegetation during the early settlement period (1863–1962), but the intensification of land use that started in the early 1960s brought about a dramatic change in the vegetation communities. This study demonstrates that while sediment production may be significantly impacted by land‐use activities, sediment delivery is primarily controlled by topography. 相似文献
996.
Consciously Constructing Exclusivity in the Suburbs? Unpacking a Master Planned Estate Development in Western Sydney 总被引：2，自引：0，他引：2
THERESE E. KENNA 《Geographical Research》2007,45(3):300-313
In Australia, master planned estates are emerging as a favoured form of residential development, finding support from urban planners and government. The proliferation of master planned estates has led urban researchers to comment on the socially exclusive nature of many of these new developments and their potential contribution to socio-spatial polarisation in the urban landscape. Do master planned estates purposefully inculcate an image of exclusivity, and do these constructions result in socio-spatial polarisation? A case study of the contribution of master planned estates to polarisation in the urban landscape is examined here. This research analysed the intentions, imagery and outcomes of a specific master planned estate in suburban Sydney – Glenmore Park. The established, socially constructed, and in some ways negative image of western Sydney has been used as a mirror against which an alternative – albeit exclusive and distinct – identity for Glenmore Park has been advanced. The intended image was for an exclusive and prestigious estate for white nuclear families. The developers and place marketers played a key role in the construction of this exclusivity, which ultimately superseded some of the more socially inclusive planning objectives for the area. The overriding conclusion from this research is that, in this case, there is an explicit connection between intentions and imagery, which encourages socio-spatial polarisation. 相似文献
997.
MICHAEL BEDWARD CHRISTOPHER C. SIMPSON MURRAY V. ELLIS LISA M. METCALFE 《Geographical Research》2007,45(4):348-357
We consider the history of woodland clearing in central western New South Wales, Australia, which has led to the present highly cleared and fragmented landscape. A combined approach is used examining available historical land‐use data and using regression analysis to relate the pattern of cleared and wooded areas in the recent landscape to environmental variables, taking into account the contagious nature of clearing. We also ask whether it would be possible to apply a simple simulation modelling approach to reconstruct a credible historical sequence of clearing in the study area. The historical data indicate that annual clearing rates have varied substantially in the study area and selective tree removal (ringbarking and thinning) has been common. These findings make it unlikely that a simple simulation approach would replicate the spatial and temporal sequence of woodland loss. Our regression results show that clearing patterns can be related to environmental variables, particularly annual rainfall and estimated pre‐European vegetation type, but that patterns are dominated by contagion. 相似文献
998.
J.B. KIRKPATRICK 《Geographical Research》2007,45(3):211-216
The disciplinary space that geographers conceive to be theirs has all been previously possessed, or latterly colonised, by other disciplines. Geographers defend their existence on the basis of their oft‐asserted, but never tested, cross‐disciplinarity. The journals in which refereed papers were published by members of the Institute of Australian Geographers (IAG) and the papers in Australian Geographical Studies were analysed for the period 1998–2002 to test the hypothesis of cross‐disciplinarity in both subject and method. IAG members do strongly tend to publish in more than one disciplinary area, and a large proportion of papers in Australian Geographical Studies are integrative across subdisciplines in geography, with many using more than one methodological approach. However, transgression of the physical geography/human geography divide was sufficiently uncommon to create a statistical break between sets of subdisciplines. Based on the data used in the present paper, Australian geographers can make a case for being members of a vital, integrative discipline, likely to make substantial advances in the hybrid spaces. 相似文献
999.
SARAH JAMES 《Geographical Research》2007,45(4):398-407
Uluru‐Kata Tjuta National Park in Australia's Northern Territory continues to be a contested site, as half of its 400 000 visitors continue to climb Uluru each year against the wishes of the Traditional Aboriginal Owners, the Anangu. Since being opened to tourism in the 1950s, Uluru has come to symbolise the ‘heart’ of the Australian nation. The influx of tourists also marked the beginning of contestations over control and access to this site between settler Australians, who wished to photograph and climb it, and the Anangu, to whom it is sacred. That visitors still climb Uluru could be seen as evidence that this site continues to symbolise a split between settler and Aboriginal Australian concepts of place and appropriate actions in relation to Uluru. To explore whether the continued climbing of Uluru was indeed evidence of an irreconcilable ‘clash’ of cultures, a survey of visitors to Uluru and interviews with both tourist operators and National Park staff were undertaken regarding visitor decision‐making processes. This research found that rather than entrenched, fixed perspectives on the issue of the Climb, both non‐Aboriginal visitors and tour operators showed an openness to the Anangu view of Uluru and their wish that it not be climbed. It also indicated, however, the importance of tourism and other media in conveying the Anangu view to visitors before they arrived at the site of the Climb itself, a point considered to be ‘too late’ by many visitors. These findings suggest the potential for change in the actions of many visitors in regard to the Climb through a more proactive representation of the wishes of the Anangu to visitors before they reach Uluru. 相似文献
1000.
LAJOS L. BRONS 《Tijdschrift voor economische en sociale geografie = Journal of economic and social geography = Revue de géographie économique et humaine = Zeitschrift für ?konomische und soziale Geographie = Revista de geografía económica y social》2006,97(5):547-566
Culture is a key concept in contemporary cultural and economic geography, but geographical research on culture is thus far mainly limited to case studies. To supplement this qualitative approach with a quantitative analysis of cultural causes and effects of geographic phenomena a data set is needed that somehow measures culture. This paper presents an attempt at such a measurement at the spatial scale of Dutch municipalities. Culture as a ‘map for behaviour’ is measured here indirectly, by means of factor analysis. Five dimensions of Dutch regional culture were found in this way: (1) post‐materialism; (2) Protestant conservatism; (3) classical individualism; (4) egalitarian anti‐conservatism; and (5) dissatisfaction. Although the regional differences in these dimensions are to a considerable extent related to differences in urbanisation, income and education rather than to some historical cultural geography, the measurement is shown to be empirically relevant and can be used in further research on culture in geography. 相似文献