全文获取类型
收费全文 | 630篇 |
免费 | 42篇 |
专业分类
672篇 |
出版年
2023年 | 11篇 |
2022年 | 2篇 |
2021年 | 4篇 |
2020年 | 19篇 |
2019年 | 34篇 |
2018年 | 38篇 |
2017年 | 51篇 |
2016年 | 43篇 |
2015年 | 26篇 |
2014年 | 20篇 |
2013年 | 147篇 |
2012年 | 29篇 |
2011年 | 40篇 |
2010年 | 33篇 |
2009年 | 27篇 |
2008年 | 16篇 |
2007年 | 11篇 |
2006年 | 17篇 |
2005年 | 9篇 |
2004年 | 10篇 |
2003年 | 7篇 |
2002年 | 15篇 |
2001年 | 9篇 |
2000年 | 7篇 |
1999年 | 10篇 |
1998年 | 4篇 |
1997年 | 7篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1975年 | 1篇 |
1972年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有672条查询结果,搜索用时 15 毫秒
101.
Gary A. King M. Thomas P. Gilbert Eske Willerslev Matthew J. Collins Harry Kenward 《Journal of archaeological science》2009
We report the recovery of short fragments of PCR amplifiable ancient DNA from exoskeletal fragments of the grain weevil Sitophilus granarius (L.) extracted from Roman and medieval deposits in Northern England. If DNA preservation in archaeological insect remains is widespread then many applications in the spheres of evolutionary studies and archaeology can be conceived, some of which are outlined. 相似文献
102.
This paper considers Frobisher Bay and Inuvik, two Canadian Arctic towns, as examples of the high-modernist planning that swept the globe during the middle decades of the twentieth century, but also Cold War projects reflecting a sudden interest in the Arctic as a region of military significance. Building on the framework provided by James Scott in Seeing like a State (1998), the paper details the connections between modernization theory and Cold War militarism before turning to the strikingly parallel case studies. In each instance, federal officials proposed ambitious urban models designed to simultaneously overcome the hostility of a northern environment and catapult native northerners into conditions of modern living. While the limits and failings of such schemes varied by location, both sites were also laboratories for social scientists employed by the federal government to document and analyze the modernization of the Arctic. The work of these scholars represents a particularly rich and complex record of governmental interventions, tied variously to Cold War imperatives, in northern lives and landscapes at a time of great faith in the transformative power of modern engineering. 相似文献
103.
Clare Tochilin William R. Dickinson Matthew W. Felgate Mark Pecha Peter Sheppard Frederick H. Damon Simon Bickler George E. Gehrels 《Journal of archaeological science》2012
Through use of methodology common in sedimentary geology, we apply U–Pb ages of detrital zircons to source nonlocal temper sand in an ancient ceramic assemblage recovered from Roviana Lagoon of the New Georgia Group in the Solomon Islands. Most potsherds from the Roviana Lagoon contain local volcanic sand as temper, but a small number of sherds contain anomalous granitic temper sand that does not appear to be local. To determine the origin of the anomalous temper, ages of zircons from the anomalous Roviana sherds are compared with ages of zircons in materials from Lizard Island off the Queensland coast and in sand from Muyuw Island in the Solomon Sea where generically similar granitic sands occur. U–Pb analyses of grains from the Roviana sherds yield Middle Miocene ages, while analyses of grains from Lizard Island granitic bedrock, sand, and local potsherds yield much older Permian-Triassic ages, disproving any possibility that the Roviana sherds were derived from Lizard Island, but suggesting local production of the Lizard Island sherds. Ages of grains in a sand sample from Muyuw Island are nearly identical to the ages of grains in the Roviana sherds. All grains in the Muyuw sand are Middle Miocene in age, overlapping closely with the Roviana age population. This strong similarity in detrital zircon signals indicates that the Roviana temper was likely derived from Muyuw Island sands. Our test case for the use of U–Pb ages of detrital zircons in sourcing temper sands is of only regional significance, and not of intrinsic global interest. The methodology, however, should find wide applicability for sourcing temper sands in many parts of the world, for it provides more specific data for the origins of tempers than either petrographic or chemical analysis. 相似文献
104.
Matthew McMurray 《European Legacy》2012,17(1):33-59
This study surveys the career and political philosophy of Alexander Raven Thomson, one of Sir Oswald Mosley's lieutenants in the British Union of Fascists (BUF), the largest party on the extreme right in Britain in the interwar era. It explores key issues relating to the BUF, such as: What type of society did Thomson and the Blackshirts wish to establish in Britain? Who were some of the major domestic and international intellectual influences on him and the BUF? Was the BUF essentially a homegrown movement or was it, as critics argued, an imitation of Italian and German fascism? What does Thomson's career reveal about the inner politics of the movement? The aim of this article is to provide a better understanding of Thomson, one of the lesser-studied BUF officials, and of the movement to which he devoted his life. 相似文献
105.
Matthew Melvin-Koushki 《Iranian studies》2011,44(2):193-214
Medieval Persian imperial correspondence (tarassul) remains relatively untapped as a source of historiographical information, due in no small part to its stylized and ornate character. This ornateness, far from being merely an obstructive husk to the useful pith of data within, constitutes a rich source of information in its own right; indeed, the formal aspects of a given letter may significantly alter the ostensible sense of the text. This study examines as a representative case a fathnama sent by Uzun Hasan to Qaytbay on the occasion of the former's victory over Sultan-Abu Sa‘id in 1469, here contextualized, translated and subjected to formal analysis with reference to contemporary insha’ manuals. For all its submissive rhetoric, the letter's aggressive intent is shown to be activated by its formal structure, which strategically deploys Uzun Hasanid messianic symbolism to challenge the ascendancy of the Mamluk state. 相似文献
106.
107.
108.
Matthew J. Sagers 《Eurasian Geography and Economics》2013,54(5):274-290
This paper examines the oil and gas industry of Sakhalin Oblast and its offshore areas, as well as the status of major investment projects. Sakhalin is the site of two of Russia's largest oil development projects with Western companies, both envisaged as major multibillion-dollar ventures. Both projects are described in detail, and remain contingent upon enactment in Russia's parliament of key pieces of oil legislation, most importantly a law on production sharing. The paper argues that even if such changes in Russia's legal and fiscal environment are forthcoming, the profitability of these projects remains uncertain, with actual development far from assured. 1 map, 2 tables, 11 references. 相似文献
109.
Matthew J. Sagers 《Eurasian Geography and Economics》2013,54(8):487-515
The value of output, employment, and capital stock for each industrial sector for each oblast-level spatial unit in the former USSR, as well as differences in regional industrial structures are presented on the basis of a unique set of unpublished Goskomstat data. Particular emphasis is placed on asessing the regions' relative raw materials endowments, especially with respect to energy resources, and on the degree of diversification, or lack of same, within their industrial structures. The extremely uneven distribution of industrial capacity is examined in light of its role in determining the near- and longer-term economic prospects for the various republics and regions. 相似文献
110.