全文获取类型
收费全文 | 246篇 |
免费 | 28篇 |
国内免费 | 8篇 |
专业分类
测绘学 | 33篇 |
大气科学 | 19篇 |
地球物理 | 61篇 |
地质学 | 37篇 |
海洋学 | 15篇 |
天文学 | 5篇 |
综合类 | 15篇 |
自然地理 | 97篇 |
出版年
2023年 | 2篇 |
2022年 | 6篇 |
2021年 | 4篇 |
2020年 | 7篇 |
2019年 | 10篇 |
2018年 | 4篇 |
2017年 | 6篇 |
2016年 | 6篇 |
2015年 | 9篇 |
2014年 | 9篇 |
2013年 | 14篇 |
2012年 | 13篇 |
2011年 | 8篇 |
2010年 | 10篇 |
2009年 | 16篇 |
2008年 | 14篇 |
2007年 | 16篇 |
2006年 | 13篇 |
2005年 | 13篇 |
2004年 | 12篇 |
2003年 | 13篇 |
2002年 | 12篇 |
2001年 | 8篇 |
2000年 | 9篇 |
1999年 | 8篇 |
1998年 | 7篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1987年 | 3篇 |
1983年 | 1篇 |
1979年 | 1篇 |
1977年 | 2篇 |
排序方式: 共有282条查询结果,搜索用时 15 毫秒
61.
International trade and industrial dynamics: Geographical and structural dimensions of Chinese and Sino-EU merchandise trade 总被引:1,自引:0,他引:1
This paper draws on trade data to examine the degree of upgrading of China’s trade structure with the world as a whole and in particular with the European Union (EU). More specifically it examines the evolution of the industrial structure of China’s trade with the world and with the EU between 1996 and 2008 and of the underlying dynamic indicators of revealed comparative advantage. This method of analysing China’s industrial structure provides clear evidence of upgrading into more advanced industries without at present losing significant competitive advantage in industries employing unskilled workers. The examination of revealed comparative advantage indices for world and Sino-EU trade also indicates an increasingly high degree of interdependence between the EU and China between 1996 and 2008. The EU (especially Germany, the UK, and France) is China’s most important export market, though it is also much more important as a market for China’s exports than the EU is as a supplier for China. China’s consequent trade surplus with the EU has gradually shifted from textiles and clothing to machinery and furniture. Further investigation reveals that the complementary Sino-EU bilateral trade is moving towards intra-industry trade at the 4-digit level of HS (Harmonization System) commodity classification. Although China is still a ‘global sweatshop’ with a strong specialization in labour-intensive commodities produced for economically developed countries (by importing machinery, raw materials and exporting processed goods), there are signs of technological upgrading in number of selected sectors in China, noticeably electronics, computers and telecommunications equipment. China’s reliance of imports of minerals indicates however that energy and resource security could be an important constraint on China’s long-term economic development. 相似文献
62.
This article discusses how the Chinese seafood industry will affect the rest of the world's fishing industries. The analysis is based on theories of economic comparative advantage, the international division of labour and the internationalization process related to trade activities. Given the increasing domestic demand for fish in China, the limited availability of domestic fish stocks and less success for farmed marine fish in China are considered some of the most important factors in restricting the growth in Chinese seafood production. The necessity of raw fish imports into China may increase pressure on global fish stocks and international fish prices, resulting in tighter supplies worldwide and higher seafood prices for the Chinese. Sustainable fish harvests and trade require stronger fishery management, in particular in the relations between seafood companies and governments along the entire international value chain supplying China. Such structural changes may allow new value-added possibilities for fish farming and the upgrading of certain fish species for human consumption that were previously utilized purely for fish feed. 相似文献
63.
The metallogenic theory of polygenetic compound ore deposit is the Important basis for location prediction of hidden ore deposits in diwa regions.It can play an important role in each step of prediction research,targeting procedure,acquiring information and integrating information.In this paper,the authors discusses how to construct geological concept by using of the metallogenic theory of polygenetic ore deposits for predicting targeting area,to arrange investigation and detection for getting enough useful information,and to analyze and integrate information for reaching a trustful prediction conclusion.According to these strategies,we conduct a successful prediction of location of hidden ore bodies in the outer of the Fenghuangshan copper mine,a principal producing mine in Tongling Cu-Au district. 相似文献
64.
Matt Bradshaw 《The Australian geographer》2001,32(2):241-257
The focus in this paper is on the shifting optimum location for a newsprint mill in Australia, factors influencing this shift, and the implications for a particular manufacturing site that is becoming increasingly outdated and out-of-place. Shipping times and schedules for high-volume, high-density tonnages of commodities such as newsprint have altered insufficiently over the last 60 years to affect competitive relations among various newsprint manufacturers around the world. With sea transport held roughly constant, changes in other aspects of the international newsprint industry can be investigated as part of unpacking the concept of globalisation. Globalisation for the former Australian Newsprint Mills Ltd meant becoming more open to new and closer competition, as well as becoming more exposed to acquisition by increasingly transnational enterprises. In the global newsprint industry at least, the world is less a smaller place than a more open one, with tonnes of newsprint moving at similar speeds to 60 years ago but among different and changing locations in terms of geography, ownership and market preference. 相似文献
65.
适用于旅游地理学的一种概念模型 总被引:13,自引:1,他引:13
米切尔以反映旅游业特征的需求、供给、联系为列,目的、结构、区位三大层面为行,建立起概念矩阵模型。本文阐释这一模型,并将其具体化为旅游地理学研究体系。最后给出应用实例,指出这个模型对一些命题单一、针对性强、又很具体的旅游业可以提供一种有益的系统思维方式。 相似文献
66.
Sheila Hones 《Geoforum》2004,35(5):549-552
This paper is a personal reflection on my participation in the panel “The Spaces of Critical Geography” at the ICGC in 2002, where my position as an European Americanist working in Asia was helpful in disrupting any tendency towards conflation of location, nationality, identity, and academic practice. These reflections focus on three topics: my interactions with various hegemonies and hierarchies; my relationship with the English language; and the contribution I believe critical geography can make to contemporary academic practice across the disciplines. 相似文献
67.
Walter Leimgruber 《GeoJournal》2005,64(3):239-248
Boundaries can be seen as barriers or as places of contact. It has been suggested that we are “prisoners of borders”, of all
kinds of borders (political, religious, social, cultural, linguistic etc.). While this statement appears to be somewhat exaggerated,
it holds some truth. Boundaries are elements in spatial organization, and they influence daily life in many ways (not only
for people living right along them). The paper addresses the question if we must call ourselves “prisoners” or if we simply
have to live with all kinds of borders. Departing from theoretical observations, the paper discusses the various aspects boundaries
assume in the European context before looking at a few concrete Swiss examples. They reveal that even regions at a certain
distance of the state border will feel its effects (the case of Zurich airport), but the most important benefit can been drawn
by people living in the border area itself (through price differences between the two countries, as exemplified by the Swiss-Italian
border). There may be asymmetry on state borders, but this asymmetry can also swing around: the advantages often lie on both
sides. The paper concludes by pointing to the persistence of the boundary concept. They are a necessity for the organization
of space and society, but they are not absolute. There are always holes in these prison walls, and the examples where boundaries
were impermeable are probably rare. 相似文献
68.
美、日、韩动漫产业发展经验及对我国的启示 总被引:4,自引:0,他引:4
目前,动漫产业已发展成庞大产业集群和消费市场,全球形成了美、日、韩三足鼎立的动漫市场格局。我国动漫产业方兴未艾,有关省市积极发展这一新兴产业,但产业规模小,产业链结构不合理,市场化运作不规范,专业人才短缺,明显落后于美、日、韩等国。本文基于我国比较优势,提出旨在发展和提升动漫产业竞争力的若干见解。首先是弘扬传统文化,塑造深入人心的动漫形象;其次,重视动漫产业链中上游产品的设计和原创,着力开发动漫产业链中相关的衍生产品,进一步优化产业链;第三,寻求适合本国动漫发展产业模式和创建和谐、良性的产业竞争内外部环境。 相似文献
69.
探讨星像的定位问题,提出一种用于实测资料分析与处理的最大相关估计方法。通过理论分析和模拟计算均表明,采用此方法后,定位精度和可处理的极限星等较之传统定位估计都大为提高。对上千颗星观测资料的处理结果也显示,最大相关处理所获得的单星精度要比中数法提高0.045”,同时本方法还大大提高了对极低信噪比观测资料的处理能力。 相似文献
70.
中国西部地区矿产资源概况 总被引:4,自引:0,他引:4
我国西部载我矿产资源丰富。特别是能源矿产,化工矿产分布相对集中,该区内的鄂尔多斯能源富集带,陕甘川有色金属矿产富集区,柴达木化工矿产富集区,塔里木油气富集区及阿尔泰有色金属富集区等已成为吸引投资颇有前景的地区。但目前西部地区矿产资源开发与利用中尚存在一些亟待解决的问题,有效地解决这些问题,将资源优势转化为经济优势,同时使资源开发与环境保护协调发展,是西部矿产资源开发与利用的正确道路。 相似文献