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   158篇
  免费   16篇
  国内免费   10篇
测绘学   15篇
大气科学   12篇
地球物理   5篇
地质学   17篇
海洋学   54篇
天文学   1篇
综合类   27篇
自然地理   53篇
  2023年   4篇
  2022年   12篇
  2021年   8篇
  2020年   6篇
  2019年   8篇
  2018年   11篇
  2017年   9篇
  2016年   3篇
  2015年   5篇
  2014年   6篇
  2013年   16篇
  2012年   12篇
  2011年   5篇
  2010年   5篇
  2009年   5篇
  2008年   6篇
  2007年   11篇
  2006年   6篇
  2005年   9篇
  2004年   6篇
  2003年   3篇
  2002年   4篇
  2001年   3篇
  2000年   5篇
  1999年   2篇
  1998年   3篇
  1995年   2篇
  1994年   1篇
  1992年   4篇
  1990年   1篇
  1988年   1篇
  1985年   1篇
  1984年   1篇
排序方式: 共有184条查询结果,搜索用时 15 毫秒
121.
This paper reviews the major themes and contributions of this Special Issue in light of a broader social science literature on how to conceptualize small-scale fisheries, the role of the state in facilitating or limiting neoliberalism, and the failure of neoliberal policies to improve conservation. It concludes with a look at ways in which neoliberalism is being undermined by emerging alternatives.  相似文献   
122.
This article explores how conceptualizing fish as food, rather than primarily as a resource or commodity supports a shift towards more systems-based approaches to engaging with fisheries (i.e. considering the relationships between ecosystems, people, management and policy). A “fish as food” lens is operationalized by drawing on the theory and practice of food sovereignty. While fishing people and communities have always been a core part of the food sovereignty movement, there have been limited efforts in the academic literature to explore these connections directly. Drawing on examples primarily from a Canadian context, it is argued that a deeper engagement between fisheries and food sovereignty is long overdue, particularly as a growing body of research on small-scale fisheries seeks to address social-ecological relationships and issues of power that are also at the core of a food sovereignty approach. This article identifies the opportunities and limitations of engaging with food sovereignty in the context of small-scale fisheries and suggests a series of key questions for future fish as food research and policy.  相似文献   
123.
《The Journal of geography》2012,111(3-4):120-131
Abstract

The political geography section of the course offers the opportunity to introduce students to one of the most important ways in which humans have divided up the surface of the Earth for purposes of management and control. By challenging students to consider what lies behind the patterns on political maps, this segment of the course can encourage the development of a critical geographical perspective while enhancing student appreciation of the link between geography and current events.  相似文献   
124.
Enclave space: a new metageography of development?   总被引:1,自引:0,他引:1  
James D Sidaway 《Area》2007,39(3):331-339
Nothwithstanding crisis and critique, development remains an enduring frame within which much social and economic transformation is interpreted and envisaged. In the context of arguments about the need for a nuanced spatial vantage point on development, this paper asks what this means in the context of new conjunctures and constellations? It focuses on intensified processes and patterns of uneven development manifest as enclaves. The paper explores these drawing on literatures about Southeast Asia, sub-Saharan Africa and the Gulf.  相似文献   
125.
中国是海洋大国,海域划界是主权之争,主权的背后是资源的问题.摸清家底,才能在国际事务中争取主动,才能为国家的经济建设服务.因此,提出“丈量海洋国土,维护国家主权;调查海洋资源,合理利用海洋;保护生态环境,防治地质灾害”的主张.只有坚持科学发展观,利用最新的科学技术,统筹规划海洋事业,合理地开发、利用和保护海洋,才能实现中国海的可持续发展和协调发展.  相似文献   
126.
如何推求基线(大地线)的平行线是基于椭球面划界技术中的一个难点问题,本文在研究了大地线平行线特点的基础上,提出了一种通过对大地线进行加密来构造大地线平行线的算法,该算法在国家间海域划界中得到了很大的应用。  相似文献   
127.
Yosseph Shilhav 《GeoJournal》2001,53(3):247-259
This paper concerns the internal political controversy that polarises the concepts of sanctity and sovereignty over Eretz Yisrael (The Land of Israel; Palestine). The controversy has deep religious roots in the history of the Jewish people's bonds with their country. The historical elements of which derive from a longing for religious perfection, which included observing Commandments associated with the Land. The destruction of the Temple, the Exile and the devastation of Jewish settlement in the Land of Israel broke the chain of such continued observance. Polarisation of the concepts of Sanctity and Sovereignty accentuates the problem of the relation between political sovereignty and national bonds with it. The association of religious affinity with the relatively recent phenomenon of Nation-State sovereignty led many to see religious connotations in political sovereignty. The traditional, religious bond with Eretz-Yisrael, which many of the more secular Israeli public also feel, has existed for generations; conversely, national sovereignty continually changes form, not always conforming to traditional, religious perceptions of dominion over the Land. This raises problems about the link between Jewish religious laws and the political world. Abandoning the knit between national sovereignty and religious bonds may lead to the loss of religious and cultural bonds. The conflict between beliefs and opinions on the one hand and new objective circumstances on the other leads to confrontations that may cause serious harm. Time becomes critical and expediting the processes of appeasement and adaptation is a matter of redoubled importance.  相似文献   
128.
明确各国北极海洋权益现状是我国未来北极活动的基础。本研究根据相关文献及图集资料,基于地图视角,对环北极国家的专属经济区划界、外大陆架申请、海洋保护区建立等方面进行定量化、空间化的分析,以此反映北冰洋海洋权益基本情况。结合《联合国海洋法公约》《公海公约》《大陆架公约》《领海及毗连区公约》等相关法律政策,预测北极海洋权益未来发展趋势并探究其对我国未来北极活动的影响,为我国未来北极策略制定提供参考。结果表明,沿岸国家对北冰洋活动的限制程度具有一定的规律性:在经向上,呈现出显著的纬度地带性,即限制程度随着纬度增高而逐渐减弱;在深度方向,对大陆架的控制范围大于对其上覆水域的控制范围。  相似文献   
129.
Urban migrant women worldwide utilize a creative combination of food insecurity coping strategies to procure food for themselves and their families. Using in-depth interviews with 72 migrant women in Medellín, Colombia, and Washington, DC, this paper argues that in low-income urban communities these everyday strategies can further their demands for autonomy in determining what foods they produce and consume. Relying on feminist geography and food sovereignty literature, this research explores how migrant women living in poverty rely on informal networks for growing and sharing food, seek out organic, fresh foods, and utilize independent survival strategies to counter exclusionary rhetoric and a food system they view as unhealthy. In doing so, they devise alternative urban imaginaries of a more democratic food system. This research contributes a more nuanced understanding of the food insecurity experiences of urban migrant women.  相似文献   
130.
Payments for ecosystem services (PES) programs have taken a variety of forms that depend on many mediating factors, such as national and local politics, land tenure, regional collective action, the capacity of intermediaries, and socio-ecological context. This diversity has produced unsurprisingly mixed experiences, with many falling short of achieving the twin goals of environmental and social benefits and some causing adverse consequences. This study examines one rare PES case that has contributed both to forest conservation and to community livelihoods. In this study, community forest owners from four indigenous communities in the Mexican cloud forest evaluate their participation in ten years of a public PES program to support watershed stewardship. We argue that attention to indigenous sovereignty and self-determination in program implementation contributed to widely appreciated socio-environmental benefits. Though many PES programs are implemented in indigenous communities, scholarly debates have rarely dealt directly with these issues.  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