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   263篇
  免费   13篇
  2023年   2篇
  2020年   7篇
  2019年   5篇
  2018年   9篇
  2017年   12篇
  2016年   8篇
  2015年   9篇
  2014年   6篇
  2013年   72篇
  2012年   8篇
  2011年   8篇
  2010年   6篇
  2009年   5篇
  2008年   8篇
  2007年   6篇
  2006年   5篇
  2005年   3篇
  2004年   7篇
  2003年   6篇
  2002年   4篇
  2001年   3篇
  2000年   5篇
  1999年   8篇
  1998年   3篇
  1997年   7篇
  1996年   4篇
  1995年   6篇
  1993年   1篇
  1992年   1篇
  1991年   1篇
  1990年   1篇
  1989年   2篇
  1988年   1篇
  1987年   3篇
  1986年   1篇
  1985年   2篇
  1984年   3篇
  1983年   3篇
  1982年   5篇
  1981年   1篇
  1980年   1篇
  1979年   4篇
  1977年   1篇
  1976年   5篇
  1975年   2篇
  1974年   1篇
  1972年   1篇
  1971年   1篇
  1969年   1篇
  1965年   1篇
排序方式: 共有276条查询结果,搜索用时 31 毫秒
91.
Infrared spectroscopy can be a valuable tool for conservators and archaeologists to help identify archaeological artefacts. We present a case‐study on the identification of an artefact recovered by North Carolina Department of Cultural Resources (NCDCR) Underwater Archaeology Branch from an early‐18th‐century shipwreck (31CR314). The wreck is assumed to be the remains of Queen Anne's Revenge, which sank off the North Carolina coast in 1718. A sample of the artefact was analysed by infrared spectroscopy to identify it. Prior to spectroscopic analysis it was speculated that the sample could be animal horn or leather. © 2011 The Authors  相似文献   
92.
Over the last two centuries, the coast has played a major role in the economy of Yucatán, and has served as a key venue in its growing engagement in the global economy. A prominent chapter in this history took place during the Gilded Age (1860–1915), which saw the emergence of a powerful plantation class whose wealth was based on meeting international demand for the fiber of the agave, or henequen plant, which was used to manufacture rope, cordage, and twine. The cultivation of this plant gave rise to hundreds of plantations, and an accompanying infrastructure of haciendas, fiber processing plants, and an extensive regional network of railways for transporting henequen to the port of Progreso, from whence it was exported to North America and Europe. As part of this infrastructure, several plantation owners laid rail lines from their haciendas to the coast and built small ports for shipping their henequen to Progreso. These ports, which are documented in these pages, represented a substantial capital outlay, and were built under the shadow of the gathering clouds of the Mexican Revolution. Viewed in retrospect, they offer an insightful perspective on the economic outlook of the Yucatecan elites in the dawn of the modern age.  相似文献   
93.
94.
Provisions in government funding agreements with non-governmental organisations (NGOs) may constrain the ability of these organisations to contribute to political debate. NGOs perceive risks to their funding if they criticise government policy. Such organisations play a significant role in the democratic process, and this article examines the applicability of the constitutional freedom of political communication to ‘gag clauses’. Australian courts have not considered the constitutional freedom in this context, but the Supreme Court of the United States has considered the question in relation to the First Amendment. The article shows what can be learned from American jurisprudence and Australian case law in order to challenge such provisions.

政府与非政府组织的资助协议中的条款约束了这些组织进行政治辩论的能力。非政府组织如果批评政府的政策就会感到资助受到威胁。非政府组织在民主过程中扮演了重要的角色,本文政治探讨了交流的宪政自由能否适用于“钳口条款”。澳大利亚法庭没有处理过此类宪政自由的案子,不过美国高等法庭倒是处理过和第一修正案相关的问题。本文分析了可以从美国的司法以及澳大利亚的案例法中学到什么,以挑战这类条款。  相似文献   

95.
Abstract

Leo Strauss, often considered a critic of modernity, is famous for his claim that Machiavelli, in turning away from the classical tradition, is its originator. Yet his “Restatement on Xenophon's Hiero” presents a concise indictment of that tradition and a remarkably sympathetic account of the political and philosophic motives that led to the rupture. In light of this tension, Strauss's interest in Xenophon appears as a useful counterweight to both.  相似文献   
96.
The Belgammel Ram was found off the coast of Libya in 1964, and examined during 2008–9. The following techniques were used: surface non‐contact digitizing using a laser scanner, reflectance transformation imaging using polynomial texture mapping and hemi‐spherical harmonics, digital photogrammetry with dense surface modelling, structured light optical scanning, and X‐ray fluorescence analysis. For internal structure the ram was examined by X‐radiography and 3‐D X‐ray tomography. Metallurgical composition was studied by micro‐drilling and subjecting the samples to scanning electron microscope X‐ray micro‐analysis, micro X‐ray fluorescence and X‐ray backscatter. The lead isotope composition was analysed. The alloy has average percentage composition Cu = 86.9, Sn = 6.3, Pb = 6.6, and Zn = < 0.10. The Belgammel Ram is probably a Hellenistic‐Roman proembolion from a small military vessel or tesseraria. The archived data are at the Faculty of Engineering and Environment, Engineering Sciences, Material Data Centre, University of Southampton ( muvis@soton.ac.uk ).  相似文献   
97.
Kaulfuss, U., Harris, A.C., Conran J.G. & Lee, D.E., 2014. An early Miocene ant (subfam. Amblyoponinae) from Foulden Maar: the first fossil Hymenoptera from New Zealand. Alcheringa 38, 568–574. ISSN 0311-5518.

The ant subfamily Amblyoponinae is presently represented in New Zealand by one endemic species in the cosmopolitan genus Stigmatomma and an introduced Australian species of Amblyopone. The fossil record of the group is restricted to two species of Stigmatomma from late Eocene Baltic Amber. Here, we describe the third fossil record, an Amblyopone-like specimen from the early Miocene of Otago, southern New Zealand, based on a winged male that resembles the extant A. australis Erichson in size, general habitus and characters of wing venation, but also shares features with the African amblyoponine genus Zymmer. This represents the first fossil record of Amblyoponinae from the Southern Hemisphere and the first example of Hymenoptera among the few pre-Quaternary insect fossils known from New Zealand. It suggests a long history of Amblyoponinae in New Zealand and Australia.

Uwe Kaulfuss [] and Daphne E. Lee [], Department of Geology, University of Otago, PO Box 56, Dunedin 9016, New Zealand; Anthony C. Harris [], Otago Museum, PO Box 6202, Dunedin 9059, New Zealand; John G. Conran [], ACEBB & SGC, School of Earth and Environmental Sciences, The University of Adelaide, Benham Bldg, DX 650 312, Adelaide SA 5005, Australia. Received 18.3.2014; revised 15.5.2014; accepted 23.5.2014.  相似文献   
98.
This article analyses Algeria's ongoing 'civil war' through the lens of contemporary Algerian theatre. Specifically, it examines the relationship between Algeria's unsuccessful transition to democratic, religious pluralism and Alek Baylee Toumi's 1996 play, Madah-Sartre . Among the prominent themes covered are the issues of gender equality as represented in the efforts of Khalida Messaoudi (Toumi's sister) to resist the 1984 Algerian Family Code; the rise of Islamic radicalism; the legacy of the philosophy of Jean-Paul Sartre and Simone de Beauvoir within contemporary Algerian intellectual and political communities; the problem of Islamic and state-sponsored terrorism; and the effects of the Islamic radicals' policies of assassinating Algerian intellectuals on the Algerian community in the diaspora.  相似文献   
99.
100.
Abstract

This paper examines how CCTV-assisted bird-watching mediates people's relationship with a particular representation of an animal world. By focusing on people's interpretations and responses to CCTV camera technology at three bird-watching sites around Scotland, it is argued that the use of CCTV technology represents a qualitatively different mode of engaging with birds which has bearing on how this mediated animal world appears in and to people's everyday lives. It is asserted that the spatial relations invoked in the act of looking at birds through a CCTV lens inscribe a conceptual hyper-separation between see-er and seen that serve to normalise a vision of humanity inherently separate from and dominant over the wildlife on screen. As a technologically mediated way of seeing, the paper explores the use of CCTV cameras as inscribing particular ‘ways of being’ that serve to define and limit people's conduct towards the birds on view. By drawing attention to the conservation discourses that support, and are supported by the use of CCTV-assisted bird-watching, it is argued that the notion of ‘keeping an eye on nature’ is embedded in a cultural agenda that assists with the construction of nature as tele-visual commodity.  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