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   455篇
  免费   33篇
  2023年   7篇
  2022年   3篇
  2021年   8篇
  2020年   17篇
  2019年   36篇
  2018年   30篇
  2017年   41篇
  2016年   38篇
  2015年   20篇
  2014年   19篇
  2013年   98篇
  2012年   22篇
  2011年   20篇
  2010年   20篇
  2009年   16篇
  2008年   8篇
  2007年   12篇
  2006年   9篇
  2005年   11篇
  2004年   6篇
  2003年   8篇
  2002年   6篇
  2001年   6篇
  2000年   5篇
  1999年   5篇
  1998年   3篇
  1997年   3篇
  1996年   1篇
  1995年   1篇
  1994年   1篇
  1993年   1篇
  1990年   1篇
  1985年   1篇
  1984年   1篇
  1981年   2篇
  1978年   1篇
  1975年   1篇
排序方式: 共有488条查询结果,搜索用时 15 毫秒
81.
82.
Community conservation initiatives have long struggled to forge productive relationships with the people living in and around protected areas. Currently, there is enthusiasm among conservation researchers and practitioners regarding local cultural taboos, which often appear to conserve species and landscapes of ecological importance. However, in incorporating local taboos into conservation programmes, there is the risk that these culturally sophisticated institutions are used in a highly reductionist manner. Drawing from ethnographic work in Madagascar, this article highlights how the simplification of cultural taboos can exasperate already fraught relationships between communities and conservation organizations, and undermine the very environmental outcomes that groups seek to promote. This reductionist approach can also lead to the harmful appropriation of local meanings and resources. Overall, while working with local taboos may potentially offer an alternative to neoliberal models of conservation, scholars and practitioners should recognize the dynamic and interconnected processes connected with taboos, instead of regarding them as static and interchangeable products.  相似文献   
83.
84.
Poropat, S.F., Martin, S.K., Tosolini, A.-M.P., Wagstaff, B.E, Bean, L.B., Kear, B.P., Vickers-Rich, P. &; Rich, T.H., May 2018. Early Cretaceous polar biotas of Victoria, southeastern Australia—an overview of research to date. Alcheringa 42, 158–230. ISSN 0311-5518.

Although Cretaceous fossils (coal excluded) from Victoria, Australia, were first reported in the 1850s, it was not until the 1950s that detailed studies of these fossils were undertaken. Numerous fossil localities have been identified in Victoria since the 1960s, including the Koonwarra Fossil Bed (Strzelecki Group) near Leongatha, the Dinosaur Cove and Eric the Red West sites (Otway Group) at Cape Otway, and the Flat Rocks site (Strzelecki Group) near Cape Paterson. Systematic exploration over the past five decades has resulted in the collection of thousands of fossils representing various plants, invertebrates and vertebrates. Some of the best-preserved and most diverse Hauterivian–Barremian floral assemblages in Australia derive from outcrops of the lower Strzelecki Group in the Gippsland Basin. The slightly younger Koonwarra Fossil Bed (Aptian) is a Konservat-Lagerstätte that also preserves abundant plants, including one of the oldest known flowers. In addition, insects, crustaceans (including the only syncaridans known from Australia between the Triassic and the present), arachnids (including Australia’s only known opilione), the stratigraphically youngest xiphosurans from Australia, bryozoans, unionoid molluscs and a rich assemblage of actinopterygian fish are known from the Koonwarra Fossil Bed. The oldest known—and only Mesozoic—fossil feathers from the Australian continent constitute the only evidence for tetrapods at Koonwarra. By contrast, the Barremian–Aptian-aged deposits at the Flat Rocks site, and the Aptian–Albian-aged strata at the Dinosaur Cove and Eric the Red West sites, are all dominated by tetrapod fossils, with actinopterygians and dipnoans relatively rare. Small ornithopod (=basal neornithischian) dinosaurs are numerically common, known from four partial skeletons and a multitude of isolated bones. Aquatic meiolaniform turtles constitute another prominent faunal element, represented by numerous isolated bones and articulated carapaces and plastrons. More than 50 specimens—mostly lower jaws—evince a high diversity of mammals, including monotremes, a multituberculate and several enigmatic ausktribosphenids. Relatively minor components of these fossil assemblages are diverse theropods (including birds), rare ankylosaurs and ceratopsians, pterosaurs, non-marine plesiosaurs and a lepidosaur. In the older strata of the upper Strzelecki Group, temnospondyl amphibians—the youngest known worldwide—are a conspicuous component of the fauna, whereas crocodylomorphs appear to be present only in up-sequence deposits of the Otway Group. Invertebrates are uncommon, although decapod crustaceans and unionoid bivalves have been described. Collectively, the Early Cretaceous biota of Victoria provides insights into a unique Mesozoic high-latitude palaeoenvironment and elucidates both palaeoclimatic and palaeobiogeographic changes throughout more than 25 million years of geological time.

Stephen F. Poropat*? [; ], Faculty of Science, Engineering and Technology, Swinburne University of Technology, John St, Hawthorn, Victoria 3122, Australia; Sarah K. Martin*? [; ] Geological Survey of Western Australia, 100 Plain St, East Perth, Western Australia 6004, Australia; Anne-Marie P. Tosolini [] and Barbara E. Wagstaff [] School of Earth Sciences, The University of Melbourne, Melbourne, Victoria 3010, Australia; Lynne B. Bean [] Research School of Earth Sciences, Australian National University, Acton, Canberra, Australian Capital Territory 2001, Australia; Benjamin P. Kear [] Museum of Evolution, Uppsala University, Norbyvägen 16, Uppsala SE-752 36, Sweden; Patricia Vickers-Rich§ [; ] Faculty of Science, Engineering and Technology, Swinburne University of Technology, John St, Hawthorn, Victoria 3122, Australia; Thomas H. Rich [] Museum Victoria, PO Box 666, Melbourne, Victoria 3001, Australia. *These authors contributed equally to this work. ?Also affiliated with: Australian Age of Dinosaurs Museum of Natural History, Lot 1 Dinosaur Drive, PO Box 408, Winton, Queensland 4735, Australia. ?Also affiliated with: Earth and Planetary Sciences, Western Australian Museum, Welshpool, Western Australia 6101, Australia. §Also affiliated with: School of Earth, Atmosphere and Environment, Monash University, Melbourne, Victoria 3800, Australia.  相似文献   
85.
86.
A batch of green‐ and amber‐coloured glass chunks and unguentaria dating from the first century CE was found in 2007 at Dibba al Hisn, a site on the Arabian Sea coast of the United Arab Emirates (UAE). Its elemental and isotopic composition revealed the glass to be of a previously unknown plant ash glass type, different from known contemporary Roman, Mesopotamian, and Indian glass. The Sr isotopic composition of the glass corresponds to locally available plants, pointing to the possible existence of a first‐century CE local glass production centre. To explore this possibility, sands from around the UAE were analysed to establish their suitability for glass making and correspondence with the Dibba finds. This paper presents the results of the elemental analysis of fourteen sands. The analysis, performed using inductively coupled plasma optical emission spectroscopy (ICP‐OES), revealed all sands to be rich in lime and alumina. X‐ray diffraction revealed the presence of calcite and other carbonate minerals, as well as antigorite and quartz. Comparison of the sand compositions to average first‐century CE non‐Roman glass found at Dibba showed them to be unsuitable as raw material for producing the glass of Dibba. The evidence thus identifies this glass batch as imported, contrary to what was suggested before. This paper also reviews the occurrence of thick‐walled unguentaria in the region.  相似文献   
87.
This collection of essays extends cross-disciplinary conversations between co-authors that began as part of a podcast series by the Relational Poverty Network, “New Poverty Politics for Changing Times”. The authors engage impoverishment as a relation, as an outcome of intersecting political projects of racialised oppression, political-economic injustice and socio-legal control. Across various sites, the collection’s essays trace poverty politics, providing conjunctural and multi-scalar analyses that illuminate the operations of power in producing impoverishment. They direct our attention beyond topics typically associated with poverty studies, showing how processes such as bordering, migrant illegality, racial capitalism and caring community politics intersect in poverty politics today. Our introductory essay argues for a relational poverty analysis that addresses the entanglements of cultural politics, those that produce classificatory schemes, together with political-economic processes that produce various forms of poverty politics in the current conjuncture. We chart thinkable and unthinkable poverty politics across the collection’s essays in order to analyse current hegemonic formations of poverty governance as well as alternative imaginations and actions that are resisting and reworking relations of impoverishment. Ultimately, this collection expands vocabularies and analytical repertoires for understanding the ongoing ways in which impoverishment is produced and resisted, positing relationality as key to re-politicising poverty towards a more just future.  相似文献   
88.
89.
The scholarly literature on the history of archaeology and archaeological organisations in late nineteenth/early twentieth century Palestine focuses almost exclusively on the Western excavators and scholars who headed this work. But Arab workers did the bulk of the actual digging, and on a daily basis they were often overseen by fellow Arabs as foremen and gang leaders. This paper applies lessons from relational history as it has been used in Levantine intellectual and labour contexts to understand the roles of two particular men, Yusif ‘abu Selim' Khazin and Yusif Khattar Kanaan, who worked for the Palestine Exploration Fund between 1890 and World War One, acting as foremen, researchers, site directors and many other roles for Frederick Bliss, R.A.S Macalister, and Duncan Mackenzie. Despite their often slim and ghostly presence in the records, in which both men are often referred to only by their shared first name, the writings of Bliss and Macalister reveal them to have been indispensable on-site and as offering insights and knowledge which influenced how both archaeological finds and indigenous life in Palestine was understood.  相似文献   
90.
In the nineteenth century, a vast area of eastern Africa stretching the length of the coast and into the reaches of the Congo River was connected by long-distance trade mostly channelled through the Omani commercial empire based in Zanzibar. As studies have recently shown, a critical factor driving trade in this zone was local demand for foreign cloth; from the 1830s the majority of it was industrially made coarse cotton sheeting from Europe and America, which largely displaced the handwoven Indian originals. Employing archival, object, image and field research, this article demonstrates that until 1885 luxury textiles were as important to economic and social life in central eastern Africa, textiles known to the Swahili as ‘cloths with names’. It identifies the thirty or so varieties which élites — and, increasingly, the general population — selected for status dress and gifts, instrumental in building the commercial and socio-political networks that linked the great region. Finally, it shows that the production and procurement of most varieties remained in the hands of Asian textile artisans and merchants; most prestigious and costly were striped cotton and silk textiles handcrafted in western India, and in the southern Arabian nation of Oman. European industrial attempts to imitate them were hampered by several factors, including their inability to recreate the physical features that defined luxury fabrics in this region — costly materials, rich colours, complex designs and handwoven structures.  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