全文获取类型
收费全文 | 791篇 |
免费 | 34篇 |
出版年
2023年 | 12篇 |
2021年 | 3篇 |
2020年 | 8篇 |
2019年 | 17篇 |
2018年 | 27篇 |
2017年 | 44篇 |
2016年 | 38篇 |
2015年 | 26篇 |
2014年 | 22篇 |
2013年 | 234篇 |
2012年 | 25篇 |
2011年 | 20篇 |
2010年 | 16篇 |
2009年 | 24篇 |
2008年 | 19篇 |
2007年 | 30篇 |
2006年 | 13篇 |
2005年 | 12篇 |
2004年 | 14篇 |
2003年 | 12篇 |
2002年 | 24篇 |
2001年 | 16篇 |
2000年 | 9篇 |
1999年 | 14篇 |
1998年 | 16篇 |
1997年 | 9篇 |
1996年 | 9篇 |
1995年 | 8篇 |
1994年 | 6篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 3篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 7篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 8篇 |
1978年 | 2篇 |
1977年 | 7篇 |
1976年 | 3篇 |
1975年 | 5篇 |
1974年 | 4篇 |
1973年 | 5篇 |
1972年 | 3篇 |
1970年 | 2篇 |
排序方式: 共有825条查询结果,搜索用时 15 毫秒
161.
162.
Stephen F. Poropat Sarah K. Martin Anne-Marie P. Tosolini Barbara E. Wagstaff Lynne B. Bean Benjamin P. Kear 《Alcheringa: An Australasian Journal of Paleontology》2018,42(2):157-229
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*? [sporopat@swin. edu. au; stephenfporopat@gmail. com], Faculty of Science, Engineering and Technology, Swinburne University of Technology, John St, Hawthorn, Victoria 3122, Australia; Sarah K. Martin*? [sarah. martin@dmirs. wa. gov. au; martin. sarahk@gmail. com] Geological Survey of Western Australia, 100 Plain St, East Perth, Western Australia 6004, Australia; Anne-Marie P. Tosolini [a. tosolini@unimelb. edu. au] and Barbara E. Wagstaff [wagstaff@unimelb. edu. au] School of Earth Sciences, The University of Melbourne, Melbourne, Victoria 3010, Australia; Lynne B. Bean [lynne. bean@anu. edu. au] Research School of Earth Sciences, Australian National University, Acton, Canberra, Australian Capital Territory 2001, Australia; Benjamin P. Kear [benjamin. kear@em. uu. se] Museum of Evolution, Uppsala University, Norbyvägen 16, Uppsala SE-752 36, Sweden; Patricia Vickers-Rich§ [prich@swin. edu. au; pat. rich@monash. edu] Faculty of Science, Engineering and Technology, Swinburne University of Technology, John St, Hawthorn, Victoria 3122, Australia; Thomas H. Rich [trich@museum. vic. gov. au] 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
163.
164.
165.
Geographically Weighted Regression: A Method for Exploring Spatial Nonstationarity 总被引:16,自引:0,他引:16
Spatial nonstationarity is a condition in which a simple “global” model cannot explain the relationships between some sets of variables. The nature of the model must alter over space to reflect the structure within the data. In this paper, a technique is developed, termed geographically weighted regression, which attempts to capture this variation by calibrating a multiple regression model which allows different relationships to exist at different points in space. This technique is loosely based on kernel regression. The method itself is introduced and related issues such as the choice of a spatial weighting function are discussed. Following this, a series of related statistical tests are considered which can be described generally as tests for spatial nonstationarity. Using Monte Carlo methods, techniques are proposed for investigating the null hypothesis that the data may be described by a global model rather than a non-stationary one and also for testing whether individual regression coefficients are stable over geographic space. These techniques are demonstrated on a data set from the 1991 U.K. census relating car ownership rates to social class and male unemployment. The paper concludes by discussing ways in which the technique can be extended. 相似文献
166.
Martin P. Sutherland 《The Journal of religious history》1997,21(3):285-301
Recent studies of the Stuart Restoration have recovered the importance of religion as a factor in the history of the period. One provocative product of this approach is Jonathan Scott's thesis that moves to exclude the Catholic James, Duke of York, from succession to the throne reflected a wider 'Restoration Crisis', characterized by shifting ideas and allegiances, which defies 'party' analysis. Two theological controversies which erupted in 1680 reveal tensions between three divergent and ultimately irreconcilable ecclesiological themes which were a feature of Early Modern English Protestant theology. Whilst in each Christ was acknowledged as head of the church they differed as to whether this authority was mediated through the magistrate or the bishops or whether the individual had immediate conscientious access to divine leading. In the 1680 disputes variants of these three positions were adopted by leading figures within both the Church of England and Dissent. The fissures did not, however, run neatly along expected lines. The analysis provides theological parallels to the political flux identified by Scott. Under the pressure of events, a complex polarization was occurring which suggests that examples of common cause over exclusion did not reflect theological reconciliation. 相似文献
167.
168.
169.
170.