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   276篇
  免费   18篇
  294篇
  2024年   1篇
  2023年   5篇
  2022年   4篇
  2020年   9篇
  2019年   25篇
  2018年   22篇
  2017年   22篇
  2016年   27篇
  2015年   9篇
  2014年   12篇
  2013年   41篇
  2012年   11篇
  2011年   12篇
  2010年   8篇
  2009年   13篇
  2008年   3篇
  2007年   7篇
  2006年   5篇
  2005年   1篇
  2004年   6篇
  2003年   5篇
  2002年   4篇
  2001年   1篇
  2000年   2篇
  1999年   5篇
  1998年   2篇
  1997年   5篇
  1996年   3篇
  1995年   1篇
  1994年   1篇
  1993年   2篇
  1992年   3篇
  1991年   4篇
  1986年   1篇
  1985年   2篇
  1983年   1篇
  1982年   2篇
  1980年   2篇
  1977年   1篇
  1969年   3篇
  1968年   1篇
排序方式: 共有294条查询结果,搜索用时 15 毫秒
1.
Compared to the geographic wasteland south of your border, geography appears to have fared well in Canada, both as a formal discipline extending our understanding by illuminating the human and physical worlds, and as a subject taught at all levels to create informed and aware citizens. I known you think much remains to be done, and perhaps things always look a bit greener on the other side of the hill, but I hope you will not mind my somewhat envious gaze. In fact, when I received the five volumes of the 'curriculum guideline' for geography, issued by the Ontario Ministry of Education for the intermediate and senior divisions of your high schools (ome 1988), my feelings were not so much envy as panic, a panic that rapidly induced something close to intellectual paralysis. Because in a moment I can only describe now as utterly weak and foolish, I started to read them, only to learn that your senior students 'analyze, interpret … explain … design and develop networks, systems and simulations that involve six or more variables' (ome 1988, A12).
In retrospect, I still think my panic was justified. After 30 years of hard post-doctoral work I have reached the point where I can think about the interactions of maybe three variables, but hardly the combinatorial possibilities of six. Such ineptness would mean that I might just squeeze into your tenth grade and from there slowly work my way over the next two years towards those Olympian heights of analytical thought where dwell Ontario's high school graduates.  相似文献   
2.
Recent lidar and pedestrian surface surveys have remapped the well-known Mesoamerican site of Izapa and the surrounding Soconusco piedmont. These data document: 1) occupation from the surrounding piedmont environment, 2) significantly larger estimates of the site's size during both the Formative and Classic periods as well as 3) new architectural features from the monumental site core. Methodological issues are outlined for combining high precision lidar mapping with ground truthing and pedestrian survey that focuses on surface collection of temporally diagnostic artifacts. Results are presented for 670 mounds documented in an area of 43.1 sq km in and around the ancient capital of Izapa.  相似文献   
3.
本文目的介绍了哥本哈根彩绘网络(CPN)各学科间的结构,成立于2004年,调查和记录哥本哈根纽约嘉士伯希腊和罗马大型和重要的彩绘雕塑收集。2004年至2008年,哥本哈根彩绘网络实施了小规模的试验计划。本文介绍了一个试点项目的研究,是关于一个阁楼古典女性的大理石头像。所采用的方法解释了一些细节,主要是关于2008至2011年哥本哈根彩绘网络之后的项目。获得的数据可以从保护科学、自然科学和古典考古学的角度解释。这篇文章接着介绍了哥本哈根彩绘网络主要项目,概述其目标、方法和组织。工作空间中描述了建立画廊可视检查方法。这个空间变得活跃,并在2009年1月的文章中提出了一个第一次初步研究报告,570B.C.E阁楼陈旧的石灰岩狮身人面像。  相似文献   
4.
5.
6.
    
Recently, the nexus of international development and emotion has received increasing attention from diverse sectors. While scholars from postcolonial, post‐structural, and feminist perspectives have long called for increased attention to emotions and the more‐than‐rational, more recent pieces such as the World Bank's World Development Report 2015 on Mind, Society, and Behavior have also taken up the refrain that “emotions matter” in development. Whether viewed as motivating factors, explanatory devices, or phenomena to be harnessed and manipulated, emotions are emerging as a key piece in development theory and practice. This paper critically analyzes the ways in which the nexus of emotion and development has been conceptualized from various perspectives. In particular, it raises questions related to geographies of power and control and highlights the implications of this emotional turn for both the theory and practice of development.  相似文献   
7.
A comprehensive remote sensing survey of AlUla County in north-west Saudi Arabia has revealed 32 examples of the ancient, stone-built animal traps known as ‘kites’. Noting that most (27) are located on the Ḥarrat ʿ Uwayriḍ, a satellite survey of parts of that lavafield outside of AlUla County was undertaken, identifying a further 175 kites. These show commonalities with ‘V-shaped’ kites previously identified in mountainous areas along the western extents of the Arabian Shield in the Sinai Peninsula, Negev Desert and south-west Saudi Arabia. A study of the form and placement of these kites in their ecological and geological contexts suggests that they are representative of a distinct complex, exhibiting sophisticated morphological adaptations to target specific games over similar terrain.  相似文献   
8.
9.
This paper extends a compartmental epidemiological model for HIV transmission and AIDS incidence to include hierarchical and expansion spatial diffusion. An implication of the resultant model is that hierarchical diffusion causes the large infection growth rates of densely populated areas at the top of the central places hierarchy to “chain” down and dominate small local growth rates during the exponential-growth phase of the epidemic. Also, hierarchical diffusion causes a high transient growth rate in the first few years of a local epidemic. The spatial compartmental model fits observed AIDS incidence spatial diffusion patterns in Ohio reasonably well.  相似文献   
10.
In more than 75% of households around the world in which water needs are fulfilled by retrieving water, women are typically tasked with this critical responsibility. This is true in Kenya, and the challenges women in rural areas of the country face are compounded by a lack of reasonable access to safe water by 56.5% of rural households. More than 25% of the population must travel at least 30?minutes to collect water, and 70% of all diseases in the country are water-borne (Kameri-Mbote and Kariuki 2015). Given their role as the primary household decision-maker about water, women have an astute understanding of water availability, access, quality and household use, and women’s perspectives would enhance decision-making in groups that address water resource management. However, women have historically been marginalized from participation in such processes for numerous reasons related to lack of empowerment, leadership, and voice, and the practicalities of the demands on her time that prevent her from having discretionary time to devote to civic processes. In this study, we interviewed 153 women living in three different watersheds in the Laikipia region of central Kenya about their views on water resource management, and interest in participation in water resource user associations (WRUAs) as members and leaders. Our results are consistent with prior research in that marginalization of women from WRUA participation is steeped in entrenched normative beliefs and behaviors about women’s roles and her domestic responsibilities, a lack of money to participate, and a lack of time given her other responsibilities.  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