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   166篇
  免费   8篇
  2024年   1篇
  2023年   3篇
  2022年   5篇
  2021年   3篇
  2020年   6篇
  2019年   7篇
  2018年   11篇
  2017年   11篇
  2016年   6篇
  2015年   9篇
  2014年   8篇
  2013年   35篇
  2012年   12篇
  2011年   8篇
  2010年   11篇
  2009年   6篇
  2008年   4篇
  2007年   8篇
  2006年   7篇
  2005年   2篇
  2004年   1篇
  2003年   2篇
  2002年   1篇
  2001年   1篇
  2000年   1篇
  1999年   1篇
  1998年   1篇
  1993年   1篇
  1992年   1篇
  1984年   1篇
排序方式: 共有174条查询结果,搜索用时 112 毫秒
21.
22.
An analysis of energy use by Neanderthals in Northern Europe during the mild Eem interglacial period is carried out with consideration of the metabolic energy production required for compensating energy losses during sleep, at daily settlement activities and during hunting expeditions, including transport of food from slain animals back to the settlement. Additional energy sources for heat, security and cooking are derived from fireplaces in the open or within shelters such as caves or huts. The analysis leads to insights not available from archaeological findings that are mostly limited to durable items such as those made of stone: Even during the benign Eem period, Neanderthals faced a considerable heat-loss problem. Wearing tailored clothes or some similar measure was necessary for survival. An animal skin across the shoulder would not have sufficed to survive even average cold winter temperatures and body cooling by convection caused by wind. Clothes and particularly footwear had to be sewn together tightly in order to prevent intrusion of water or snow. The analysis of hunting activity evolvement in real time further shows that during summer warmth, transport of meat back to the base settlement would not be possible without some technique to avoid that the meat rots. The only likely technique is meat drying at the killing site, which indicates further skills in Neanderthal societies that have not been identified by other routes of investigation.  相似文献   
23.
The influence of relief, as well as other environmental features such as soils or the hydrological regime, on prehistoric settlement patterns is commonly accepted. Settlement patterns and preferences changed over time in different areas, so it is difficult to formulate general rules of human behaviour throughout history. In lowland areas of the temperate zone, which lack radical relief changes and have widespread access to water resources, specific settlement preferences and significant changes in these preferences are difficult to interpret.New methods developed to address the problem of the settlement transformations as a result of prehistoric settlement and economic processes using multivariate statistics have been adapted for the middle part of the Great Poland Lowland. In this region, data from the Polish Archaeological Record Project database have been used.Models of the dependence between geomorphological features and settlement intensity form the basis for estimating changes in prehistoric settlements. The degree of preference (or avoidance) is a nonparametric function of the number of archaeological sites observed in the area relative to the number of sites expected from a completely random pattern. The most crucial factors for settlement are distance to plateau edges, distance to water bodies, and the wetness index. The results show that the entire investigated area is more or less suitable for settlement, but the most occupied terrains are the areas near plateau edges.  相似文献   
24.
The need for effective knowledge transfer has been well documented; however, few narratives reflect on postgraduates as brokers of knowledge when participating in collaborative studentships. This paper reports on the authors' experiences of undertaking Economic and Social Research Council (ESRC) and Scottish Government (SG) collaborative PhD studentships in geography, a new studentship which trains doctoral students to be employable in both academe and government. Particular focus is given to the experiences related to an annual month-long SG placement, which increases opportunities for knowledge transfer by engendering a deeper awareness of the needs of all partners. It concludes by considering what the experiences offer to the PhD process, authors' future prospects, and the issue of knowledge transfer more broadly.  相似文献   
25.
Abstract: What ethical obligations do researchers have to research informants in marginalised communities in serious distress? Our “dissemination as intervention” exercise reported research findings back to a South African rural community—using a dialogical approach which sought to strengthen participants’ confidence and ability to respond more effectively to HIV/AIDS. Nine workshops were conducted with 121 people. Workshops provided opportunities for participants to start developing critical understandings of the possibilities and limitations of their responses to HIV/AIDS, understandings which constitute a necessary (though obviously not sufficient) condition for further action. Workshops alerted participants to the valuable role played by local HIV/AIDS volunteers, facilitating reflection on how local people might better support the volunteers. These discussions served as the impetus for the establishment of a three‐year community‐led intervention to further these goals.  相似文献   
26.
This paper presents the results of a simulation exercise designed to explore and understand the implications of trying to survive in a marginal and poverty-stricken African community. The aim of the simulation was to create an approximation of a community involved in an income-generating project, akin to a Public Works Programme. This project sought to enable every person to earn a dollar a day on which to live. In addition, the exercise helped the participants to question and assess whether the Millennium Development Goals (MDGs) have a chance of reaching their proposed targets. The nearly one hundred participants were undergraduate geography students, reading Development Studies and Demography at Rhodes University in Grahamstown, South Africa. The outcome of the simulation was that the students developed a clearer understanding of poverty, particularly the ‘Deprivation Trap’, and how complex the development process is in practice.  相似文献   
27.
企业直接投资区位选择是经济地理学的经典议题。目前直接将区位条件与关系网络衔接起来分析企业直接投资区位选择过程的研究较为少见。本文基于关系视角和中国情境,构建了关系连通、区位耦合、博弈谈判三位一体的模型,提出了一种对企业直接投资区位选择过程化的理解方法。文章以案例研究方法,对企业家赴甘肃省和浙江省开发区投资考察过程进行了参与式观察与访谈。研究发现,企业直接投资区位选择遵循关系连通—区位耦合—博弈谈判的过程。第一,企业与投资地关系连通是企业到当地投资的前提,而结构洞有利于企业与投资地关系形成。第二,企业与投资地区位耦合是企业投资区位选择的必经过程。第三,企业与投资地政府博弈谈判是企业投资的重要过程,且必须达成两厢情愿企业才可能在当地投资。在中国情境中,本文的理论模型具有现实代表性。本文的创新之处是结合中国情境,运用关系视角,对企业投资区位选择过程进行了理论重构。  相似文献   
28.
鉴于目前我国在构建价值转移模型中存在的限制因素,本文采用基于Meta分析的价值转移方法并尝试利用国外游憩活动价值评价的实证研究结果,构建基于Meta分析的国际间价值函数转移模型,估算了我国10种游憩活动的日平均消费者剩余.通过将价值转移模型估算的游憩活动价值“转移值”与国内97个游憩价值评价的“真实值”做比较,对价值转移模型的有效性和可靠性进行统计检验,平均转移误差为18.74%.最后,总结了提高我国Meta回归价值转移模型的具体、可操作性方法及途径.  相似文献   
29.
ABSTRACT

This article looks at the imaginaries of progress through technology and new activities by tracing the emergence of Baltic Moorkultur in Estonia and Livonia from the 1850s to the early 1910s. Baltic Moorkultur, a set of modern drainage and peat extraction techniques, has been viewed as part of a modernisation process and evolving visions of future, which touched the identity of Baltic German landowners, scientists and entrepreneurs. General reasons for an impetus for the large-scale reclamation of peatlands were the growth of population, economic liberalisation, growing demand for fuels and the fact that the basis of manorial economy gradually crumbled and led to increasing urge to modernise its source of livelihood. Baltic Moorkultur can be thought as a high-tech response of that time to the exploitation of peatlands. This article explains why it became adopted and how it altered the appraisal of environments that had been perceived as suboptimal.  相似文献   
30.
As stress on water resources increases from growing human demands and a changing climate, recognition of the need to develop effective strategies for water governance is expanding. Consequently, it is timely to consider the legacy of effective instances of water policy innovation that have been highly influential in water resource management in Canada. We present two historical examples of policy transfer – that is, when policy employed in one jurisdiction is adapted for use in another. The first is the late nineteenth-century adoption of water allocation law in the North-West Territories that was a noteworthy departure from how water had been allocated in eastern Canada. The second is the twentieth-century introduction of conservation authorities in Ontario as regional watershed-based management entities. These examples illustrate how, in an era of expert-driven natural resources management, notions of governance were adapted from Australia and the United States. They also reveal how the biophysically-based policy context of water influences which policy transfer mechanisms are appropriate for lesson-learning. We conclude that the potential for policy transfer and lesson-learning to shorten the policy innovation timeline must be viewed as a critical response to urgent and evolving demands on water.  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