全文获取类型
收费全文 | 1263篇 |
免费 | 32篇 |
专业分类
1295篇 |
出版年
2024年 | 21篇 |
2023年 | 14篇 |
2022年 | 34篇 |
2021年 | 31篇 |
2020年 | 72篇 |
2019年 | 82篇 |
2018年 | 64篇 |
2017年 | 67篇 |
2016年 | 82篇 |
2015年 | 49篇 |
2014年 | 49篇 |
2013年 | 125篇 |
2012年 | 58篇 |
2011年 | 51篇 |
2010年 | 54篇 |
2009年 | 50篇 |
2008年 | 57篇 |
2007年 | 57篇 |
2006年 | 34篇 |
2005年 | 44篇 |
2004年 | 36篇 |
2003年 | 26篇 |
2002年 | 34篇 |
2001年 | 22篇 |
2000年 | 24篇 |
1999年 | 13篇 |
1998年 | 10篇 |
1997年 | 9篇 |
1996年 | 9篇 |
1995年 | 4篇 |
1993年 | 1篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
排序方式: 共有1295条查询结果,搜索用时 15 毫秒
71.
《Interdisciplinary science reviews : ISR》2013,38(1):47-58
AbstractThus far, certainly in English, most engineering history has been based on the lives of engineers or the chronologies of particular enterprises, with the two often woven together. Much of this work, as conventional biography or narrative history, has been well done, in many cases is a good read, and frequently is valuable as a basis for further study. But its preoccupation with who, when and where too often leaves unaddressed questions of how and why. Attempting to understand the intellectual and creative components of engineering's history, especially its early history for which written records are rare or nonexistent, is exceptionally difficult. In this short survey the possibilities of retrospective analysis are discussed, and some of the potential pitfalls are identified by considering the particular case of cathedral building. Over the last twenty or thirty years cathedral studies have generated more publications in the field of retrospective analysis, in this case structural analysis, than possibly any other. Whether or not very much has been learned about the history of the engineering of cathedrals, however, is a good question, and is part of what follows. 相似文献
72.
This paper describes the hitherto unreported occurrence of mid‐Holocene mangrove deposits in the Richmond River estuary, southeastern Australia, thereby providing evidence for changes in the distribution and composition of mangrove communities within a subtropical estuarine system during the Holocene. Stratigraphic, radiocarbon and palynological evidence indicates that widespread development of mangrove communities took place in the upstream reaches of the Richmond River estuary during the period 7000 to 6000 years BP. These communities maintained their habitat through substrate aggradation under the conditions of a moderate sea‐level rise, in contrast to other estuaries within the region, which generally experienced the submergence of intertidal substrates. Mangrove species belonging to the family Rhizophoraceae, most likely Bruguiera gymnorrhiza and Rhizophora stylosa, dominated these communities, in strong contrast to contemporary communities, which are dominated by Avicennia marina. Moreover, these mid‐Holocene communities were located a considerable distance upstream of the contemporary occurrences of Rhizophoraceae species within the estuary. The changes in the spatial distribution and composition of mangrove communities parallel the large‐scale evolution of the estuary driven by sea‐level variation. Shallow, buried Pleistocene terraces probably contributed to the regionally unique aggradational response of the mangrove communities and their substrates to a sea‐level rise during mid‐Holocene times. 相似文献
73.
ERIC KOOMEN TOM KUHLMAN JAN GROEN ARNO BOUWMAN 《Tijdschrift voor economische en sociale geografie = Journal of economic and social geography = Revue de géographie économique et humaine = Zeitschrift für ?konomische und soziale Geographie = Revista de geografía económica y social》2005,96(2):218-224
The agricultural sector in the Netherlands has lost much of its importance over the last 50 years in terms of the number of people involved and its relative contribution to the economy – even though production is still increasing. Yet, the area under agricultural use has changed relatively little: farmland still dominates the country. The question for the future is how expected further changes in agriculture will affect agricultural land use: how much land will be taken out of production and to what use it will be put. This is especially relevant now that the Dutch Government has decided to loosen its grip on spatial planning. Two opposing socio‐economic scenarios are therefore drafted that offer a coherent view on agricultural change, external pressures and government intervention. Implementing these in a land use simulation model provides an initial answer to the possible future of agricultural land in the country. 相似文献
74.
YEHUA DENNIS WEI DANLIN YU XIAOJING CHEN 《Tijdschrift voor economische en sociale geografie = Journal of economic and social geography = Revue de géographie économique et humaine = Zeitschrift für ?konomische und soziale Geographie = Revista de geografía económica y social》2011,102(4):406-425
This study analyses regional development in provincial China through a case study of Jiangsu following the multi‐scale and multi‐mechanism framework. We have revealed a trend of increasing regional inequality and find it is mainly a result of the rapid development of Sunan (Southern Jiangsu), which also results in rising rural inter‐county inequality. Subei (northern Jiangsu) faces more challenges due to the strong effects of self‐reinforcing agglomeration and the constraints of geographical barriers. The spatial Markov chain analysis reveals that the development status of neighbouring counties has a strong influence on a county's development dynamics; a poor county neighbouring relatively richer counties has a higher possibility to move upwards, and vice versa. The geographically weighted regression analysis reveals that development mechanisms have strong local characteristics and the same mechanism affects regional development differently. Finally, our study confirms that the multi‐scale and multi‐mechanism framework helps the understanding of regional development in Jiangsu. 相似文献
75.
This study uses data of about 9,000 apartment sales in Stockholm, Sweden, to assess the impact of crime on property prices. The study employs hedonic pricing modelling to estimate the impact of crime controlling for other factors (property and neighbourhood characteristics). Geographic Information System (GIS) is used to combine apartment sales by coordinates with offences, land use characteristics and demographic data of the population. The novelty of this research is threefold. First, it explores a set of land use attributes created by spatial techniques in GIS in combination with detailed geographical data in hedonic pricing modelling. Second, the effect of crime in neighbouring zones at one place can be measured by incorporating spatial lagged variables of offence rates into the model. Third, the study provides evidence of the impact of crime on housing prices in a capital city of a traditional welfare state, information otherwise lacking in the international literature. Our results indicate that apartment prices in a specific area are strongly affected by crime in its neighbouring zones, regardless of crime type. When offences were broken down by types, residential burglary, theft, vandalism, assault and robbery individually had a significant negative effect on property values. However, for residential burglary such an effect is not homogenous across space, and apartment prices in central areas are often less discounted by being exposed to crime than those in the city's outskirts. 相似文献
76.
C. Michael Hall 《Geographical Research》2005,43(2):125-139
Tourism is one of the world's largest legal industries. At the same time that tourism has grown so has its study, to the extent that there is debate as to whether it may constitute a discipline in its own right. Geographers have long contributed to the study of tourism. However, there is substantial concern over the development of the sub‐discipline and how tourism is conceptualised. A framework for understanding tourism in relation to contemporary human mobility over space and time is provided. This framework bears strong relationships to research on time geography as well as to work on diaspora and transnationalism. Some of the implications of incorporating tourism within the framework of mobility are outlined with respect to mobility as a form of capital, the relationships between different forms of mobility, and an improved understanding of tourism's impacts at all stages of the travel process rather than just at the destination. 相似文献
77.
Joni Vainikka 《Social & Cultural Geography》2013,14(6):587-605
Regions have been regarded as processes, artefacts and discourses, and recently as ‘brands’ that various stakeholders use in marketing. Discourses on institutional regions are typically promoted by media, governmental bodies and planning organizations that draw on reputed collective regional identities—the expressions of past and current social discourses and cultural practices. However, such institutional regional discourses are often incongruous to spatial imaginaries of everyday life. This article scrutinizes the meanings of spatial attachment to citizens and explores to what extent regional identities are meaningful in everyday life. To avoid biased assumptions, focus-group interviews were carried out within four Finnish provinces among the members of four social movements. The results show that provincial spaces are not actively thought-and-practiced. Spatial identities are rather structured around personal experiences that typically accumulate in several locales, since personal histories are increasingly characterized by mobility. This article also recognizes that the everyday meanings of a socially constructed region are often generationally read and combine different historical narratives. 相似文献
78.
MARCO HELBICH 《Tijdschrift voor economische en sociale geografie = Journal of economic and social geography = Revue de géographie économique et humaine = Zeitschrift für ?konomische und soziale Geographie = Revista de geografía económica y social》2012,103(1):39-52
The surroundings of European cities are becoming ever more complex and sophisticated landscapes. In recent years there has been an ongoing debate about urban fringes that are developing over and beyond the influence of postsuburban processes into decentralised and non‐centred urban landscapes. This paper addresses the urgent need to consider polycentric functional service clustering in the urban fringes based on empirical evidence gathered in Vienna, Austria, which served as a case study. A spatial scan statistic is applied to detect local spatial clusters of services and the bivariate K(d)‐function is used to investigate the spatial interaction between each nucleus. Due to some significant functional clusters, it has been concluded that agglomeration economies are still of prime interest. Furthermore, some significant attraction between the studied clusters is investigated. Overall, the results do not contradict the concept of postsuburbia yet, which is why a paradigm shift must be ruled out. 相似文献
79.
Katharina Manderscheid 《对极》2012,44(1):197-216
Abstract: Subsequent to the Brundtland Report (World Commission on Environment and Development 1987, Our Common Future), sustainability has been set up in many countries as a mission statement of cross‐sectoral policies. Sustainable development carries the normative notions of equity, empowerment and environmentally sensitive economic development. Thus, it seems to suggest a fundamentally different vision to neoliberal dogma, which is at the same time described as dominating all socio‐political processes. This paper intends to explore the relation between these two discursive framings of contemporary policies through the example of German spatial planning guidelines. More precisely, it addresses social justice as one pillar of sustainability and how it is operationalised in spatial planning policies in Germany. This may exemplify how the seemingly opposing discourses interact in policy practices. The empirical analysis suggests that the ways in which the German spatial planning report focused on social space in territorial terms promotes an economistic and truncated view of social justice, one which fosters the neoliberal idea of regional competition for global capital and reduces socio‐spatial justice to territorially equally distributed economic inclusion. 相似文献
80.
Book reviews: Graeme Evans, Cultural Planning: An Urban Renaissance Helen Jarvis, Andy C. Pratt & Peter Cheng‐Chong Wu, The Secret Life of Cities: The Social Reproduction of Everyday Life John Hargreaves, Freedom for Catalonia? Catalan Nationalism, Spanish Identity and the Barcelona Olympic Games Luis Moreno, The Federalization of Spain 相似文献