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   497篇
  免费   25篇
  2023年   3篇
  2021年   6篇
  2020年   9篇
  2019年   18篇
  2018年   27篇
  2017年   27篇
  2016年   27篇
  2015年   16篇
  2014年   18篇
  2013年   138篇
  2012年   15篇
  2011年   16篇
  2010年   11篇
  2009年   13篇
  2008年   7篇
  2007年   8篇
  2006年   11篇
  2005年   7篇
  2004年   5篇
  2003年   4篇
  2002年   11篇
  2001年   11篇
  2000年   4篇
  1999年   11篇
  1997年   6篇
  1995年   4篇
  1994年   4篇
  1993年   3篇
  1992年   5篇
  1989年   2篇
  1988年   5篇
  1987年   3篇
  1984年   3篇
  1983年   4篇
  1982年   2篇
  1981年   3篇
  1980年   2篇
  1979年   2篇
  1978年   3篇
  1977年   2篇
  1976年   4篇
  1975年   2篇
  1974年   2篇
  1973年   6篇
  1972年   3篇
  1971年   2篇
  1970年   3篇
  1969年   3篇
  1968年   4篇
  1967年   3篇
排序方式: 共有522条查询结果,搜索用时 328 毫秒
91.
Abstract

The Middle East has long been a conflict zone; the Palestinian-Israeli conflict has been a persistent factor for decades, and there have been wars over natural resources, ideological causes, and national or religious cleavages as well. How does a historian begin to compile a documentary record of such a struggle? At the beginning of my research stay in the Middle East in 2007, I decided to keep a diary about my experiences and assessments in the field. In this article, I recount and reflect about those experiences in order to propose potential solutions to the problem of on-site research in unstable areas. While field research generally requires a particular kind of preparation, and always faces obstacles and challenges, the success of fieldwork under difficult and hostile research settings is dependent on the skills of the researcher, and his or her ability and preparedness for the problems the nature of the research inevitably will bring forward.  相似文献   
92.
93.
Almost all archaeological ceramics undergo slow, progressive rehydroxylation by chemical combination with environmental water. The reaction is accompanied by an expansion, and also by the small but measurable mass gain that provides the basis of the RHX dating method. The rate of the RHX reaction increases with increasing temperature. Here we describe comprehensively the effects of temperature on the RHX process in relation to the dating methodology. We deal in turn with the kinetic model of the RHX reaction, the temperature dependence of the RHX rate, and the influence of varying environmental temperature on the RHX mass gain. We define an effective lifetime temperature and show how this is calculated from an estimated lifetime temperature history. Historical meteorological temperature data are used to estimate the lifetime temperature history, and this can be adjusted for long-term climate variation. We show also how to allow for the effects of burial in archaeological sites on the temperature history. Finally we describe how the uncertainties in estimates of RHX age depend on the estimates of temperature history and effective lifetime temperature.  相似文献   
94.
95.
The Australian Labor Party, following its election to government in 2007, has implemented an ambitious social policy agenda with spending on hospitals, pensions and community workers, as well as programs for parental leave and disability. It has also reformed taxes, in part to finance these reforms, implementing the mining and carbon taxes in 2012. Labor, however, has difficulty avoiding deficits because tax revenues are too low to finance expanded welfare. This article explores the political constraints and opportunities involved in financing welfare by examining voter responses to the ANU Poll of September 2011. Spending on welfare is supported by low-income earners, while taxing big industries finds greater support among university-educated voters. The article advances an explanation for this mismatch and for why tax resistance has hindered Labor's efforts to finance welfare expansion.

澳大利亚工党在2007年选举上台后实施了雄心勃勃的社会政策计划,涉及医院、养老金、社区工作人员、带薪育婴假、残疾人等项开支。它还在2012年改革了税收,推行采矿及碳排放税为上述改革筹集资金。不过,工党苦于避免赤字,因为税收太少,资助不了扩大的福利。本文分析了选民对2011年9月ANU民调的回应,探讨了资助福利之举的限制与机遇。低收入者支持福利开支,受过高等教育者则多支持向大企业征税。本文解释了这种矛盾,以及为什反税收阻碍了工党资助福利扩张的努力。  相似文献   

96.
That the 1990s began and ended with wars in the Balkans, often evoking reference to ‘ancient hatreds’, might suggest little has been learned since the fall of the Wall on how to address the recrudescence of violent ethno‐nationalist conflict – and indeed some fatalism as to whether this can be done at all. Yet the rethinking of notions of national sovereignty, the increasing minority‐rights jurisprudence and the development of anti‐essentialist concepts of identity in recent times have begun to indicate new policy instruments which might better allow such conflicts to be managed in the twenty‐first century. As ever, however, policy lags behind intellectual innovations, and the predominant approach of the international community remains for the moment significantly more conservative in character.  相似文献   
97.
98.
99.
100.
A copper‐alloy thimble was found in 2010 at Punta Secca, Sicily, in a sealed context datable by coins to the first quarter of the seventh century AD. It has generally been thought that thimbles did not reach the Mediterranean area until the ninth century AD, but at least nine metal examples are in fact attested at various places from contexts datable between the late sixth century and the early ninth. It is suggested that the increasing use of silk in clothing in the Byzantine Empire during the seventh century, probably accompanied by the use for the first time of steel needles which made the use of a finger protector imperative, explains the apparent introduction of thimbles at this time. No securely dated metal thimbles are known from sites of Roman date, except for one at Ephesus of c.AD 100. It is very tentatively suggested that this last example might represent an import from China, where thimbles (and steel needles) are attested from at least the third century BC onwards.  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