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   1883篇
  免费   73篇
  2020年   28篇
  2019年   42篇
  2018年   58篇
  2017年   71篇
  2016年   79篇
  2015年   42篇
  2014年   48篇
  2013年   514篇
  2012年   48篇
  2011年   58篇
  2010年   51篇
  2009年   56篇
  2008年   54篇
  2007年   30篇
  2006年   42篇
  2005年   42篇
  2004年   40篇
  2003年   35篇
  2002年   35篇
  2001年   34篇
  2000年   32篇
  1999年   18篇
  1998年   31篇
  1997年   27篇
  1996年   19篇
  1995年   17篇
  1994年   24篇
  1993年   18篇
  1992年   13篇
  1991年   13篇
  1990年   15篇
  1988年   14篇
  1987年   16篇
  1986年   19篇
  1985年   17篇
  1984年   28篇
  1983年   21篇
  1982年   23篇
  1981年   11篇
  1980年   20篇
  1979年   18篇
  1978年   9篇
  1977年   20篇
  1976年   15篇
  1975年   12篇
  1974年   12篇
  1973年   7篇
  1972年   9篇
  1970年   7篇
  1968年   7篇
排序方式: 共有1956条查询结果,搜索用时 15 毫秒
91.
Abstract

The loss of agricultural land and its implications have been of great concern in the last decade. By undertaking a spatial analysis of the appropriation of agricultural land for urban use with an overlay of population and urban data, a focus on the consequences of certain regulations on the dynamics of land-use change is explored. This is achieved by integration of data inventories of agricultural land use for Portugal, and linking this information with CORINE Land Cover data as to assess change in the Algarve. An integrated assessment of agricultural land loss follows, undermined by the consequences of urban sprawl. In this sense, this paper expands on the currently existing decrees which provide support to sustainable development in the region while providing a qualitative assessment of future roles based on ethical values and economic efficiency and offering a feasible framework for policy-makers regarding the trends of urban/agricultural dichotomy in a planning and decision-making context.  相似文献   
92.
93.
94.
95.
The reemergence of cognitive studies in comparative psychology and ethology, coupled with ongoing archaeological discoveries and recent advances in genomics, have contributed to the current explosion of scientific interest in dogs (Canis lupus familiaris). The long and complex evolution of a human-dog relationship is explored from the differing perspectives of ethology, cognitive sciences, evolutionary anthropology, archaeology, and paleoanthropology. Our understanding of dogs is again shedding light on human cognitive evolution and the complex, and at times controversial, process of domestication.  相似文献   
96.
The widespread notion that the city is secular and that therefore society’s future is secular is in need of serious reconsideration. This paper argues that religion does not melt away but rather morphs into modern forms of aspiration, speculation, and contention. Religion is therefore crucial to social inquiry into the nature of the urban. The paper argues that in Asia the Christian modern is close to the secular modern with fragments of rational planning and calculation in constant interplay with fragments of the magic of speculative modernity. Both communism and market capitalism are ideological cousins of Christian millenarianism. In a comparison of India, China, and Singapore it argues that the Christian form of modernity has been much better able to penetrate and coalesce with Sinic civilizational traditions than with Indic civilizational traditions.  相似文献   
97.
98.
Indigenous women continue to experience a disproportionately higher burden of cervical cancer than non‐Indigenous women in Australia. The National Indigenous Cervical Screening Project used probabilistic record linkage to combine population‐based administrative databases and identify Indigenous women on Pap Smear Registers. This study aimed to quantify the spatial variation by local government areas (LGAs) for Indigenous and non‐Indigenous women in Queensland in cervical screening participation rates and related outcomes. Empirical Bayes local geostatistical smoothing was performed to reduce the likelihood of spurious variation between small areas. The cohort included 1,091,260 women (2 per cent Indigenous) aged 20 to 69 with 2,393,708 Pap smears between 2006 and 2011. Indigenous women had smoothed LGA‐specific 5‐year participation rates (interquartile range (IQR) 38.9–53.3 per 100 eligible women) consistently lower than non‐Indigenous women (IQR 80.7–85.3). The non‐overlapping confidence intervals of these rates suggest that the Indigenous differential was significant. Compared with Indigenous women, non‐Indigenous women had consistently lower and more stable prevalence rates of histologically confirmed high grade abnormalities (IQR 8.0–10.1 versus 15.0–21.3 per 1,000 screened women). Although the LGA‐specific rates also suggest that a higher proportion of non‐Indigenous women were followed‐up within two months of an abnormal screening result, the wide confidence intervals for these estimates limit our ability to draw definitive conclusions about spatial patterns for this outcome. These findings highlight the importance of continued monitoring and ongoing efforts to identify drivers of these patterns and develop effective strategies to improve participation and potentially reduce the cervical cancer burden among Indigenous women.  相似文献   
99.
Kicking in soccer has been the subject of scientific research for more than 40 years yet review articles summarizing the biomechanical fundamentals of kick optimization as a guide to coaching are scarcely to be found. The current review article aims to bridge the gap between scientific research into the maximal instep kick (including studies employing 3D motion capture and full-body biomechanical modelling) and the application of such research in coaching. It does so by supplying a scientifically founded, coaching-friendly article explaining identifiable characteristics and motor control sequencing that define this skill. Relevant biomechanical factors are identified in a way that should help coaches better develop training programmes and, at the same time, foster better understanding of the skill among athletes. Such information will contribute to both accelerated skill acquisition and, by concomitant gains in skill efficiency, the development of programmes that minimize risk of injury to athletes during training.  相似文献   
100.
One of the most important dilemmas facing the British authorities when they occupied their zone of Germany at the end of the Second World War was what to do with German science. The contributions made by scientists and engineers to the Nazi war machine, in fields such as rocketry and submarines, meant that German science was both revered and feared, and was therefore closely linked to concerns about a post-war military resurgence in Germany. This article aims to chart the changing approaches which the British occupation officials adopted towards German science in this period. While the initial intention was to prevent Germany from ever waging war again, through demilitarisation, denazification and dismantling, the focus changed as British enmity shifted from a former adversary, Germany, to a former ally, the Soviet Union. Policy reflected this shift as technology transfer and the reconstruction of domestic German science won greater favour. This article aims to show that, in the face of growing hostility from the USSR and in the deeply suspicious climate of the early Cold War, Britain was forced to abandon its moral mission towards German science and adopt a far more pragmatic strategy instead.  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