全文获取类型
收费全文 | 427篇 |
免费 | 13篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 3篇 |
2021年 | 2篇 |
2020年 | 17篇 |
2019年 | 21篇 |
2018年 | 42篇 |
2017年 | 29篇 |
2016年 | 29篇 |
2015年 | 23篇 |
2014年 | 21篇 |
2013年 | 76篇 |
2012年 | 20篇 |
2011年 | 24篇 |
2010年 | 21篇 |
2009年 | 11篇 |
2008年 | 15篇 |
2007年 | 12篇 |
2006年 | 12篇 |
2005年 | 6篇 |
2004年 | 5篇 |
2003年 | 7篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 4篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
排序方式: 共有440条查询结果,搜索用时 0 毫秒
101.
The levels and characteristics of entrepreneurship differ widely across EU countries and regions. Taking as reference data provided by the Global Entrepreneurship Monitor on entrepreneurial activity and entrepreneurial attitude, this paper analyses the disparities in entrepreneurship indicators among EU member countries in 2007 and 2013, highlighting the most significant changes that occurred during the Great Recession. Some of the major indices of inequality are calculated (Gini, Theil and Atkinson) and the change in the Gini coefficient between these two years is additively decomposed into mobility and progressivity components. Overall, we find that cross-national inequalities tend to increase in the procyclical aspects of entrepreneurial activity and attitude, while they tend to decrease in the countercyclical aspects. For entrepreneurial activity indicators, we reveal that heterogeneity increases in indicators such as opportunity-driven entrepreneurial activity and total entrepreneurial activity, while necessity-driven entrepreneurial activity becomes more homogeneous across countries. Regarding entrepreneurial attitudes, disparities among countries decrease in all indicators, except in perceived opportunities, for which cross-national inequality grows considerably during the crisis period. 相似文献
102.
Shirlena Huang Janice Monk Joos Droogleever Fortuijn Maria Dolors Garcia-Ramon Janet Henshall Momsen 《Gender, place and culture : a journal of feminist geography》2017,24(7):919-938
In examining the development of the International Geographical Union’s (IGU) Commission on Gender and Geography over the last three decades, we first highlight the advances made to establish visibility for gender studies within the IGU and create structures for more inclusive feminist geographies across national, disciplinary and other borders. Given that many of the early and most widely-known advances were largely within Anglophone contexts, we then discuss the ongoing challenges and possibilities for advancement faced by feminist geographers who teach, research, and write on gender in other locations. While some of these challenges (such as a continued lack of recognition for gender studies, paternalistic hierarchies, and specific government regimes) are country-specific, others are related to broader issues of neoliberalism and corporatization, and inequities in academic publishing. Clearly, continued efforts are needed to strengthen the agenda for gender to promote more inclusive histories, practices and processes of gender/feminist geography in research, teaching and application in the international arena. 相似文献
103.
The Portuguese mountain city of Covilhã possesses a singular industrial tradition. Today, many of the urban interventions undertaken result in an urban space and landscape disconnected from the mountains. Alpine mountain cities emerge as emblematic, given the representativeness the Alps assume within the context of European mountains. In the Alpine region, the polycentric system of cities condenses the characteristics associated with the topographical particularities and singular types of inter-municipal and cross-border relationships, where the economic changes and regional policies can be observed with greater clarity due to their specificity. In general terms, the quality of life, based on the landscape values, the identification of the citizens with their territory, and on the territorial planning at different scales, emerges as being linked to the construction of a brand identity based on sustainable urban development. It is in this sphere that the study of Alpine cases can inspire good practices to be applied in the Portuguese territory of the Beira Interior, namely in the medium-sized cities and in the synergies between them and the natural spaces. Thus Covilhã finds itself in an advantageous position to use its situation to construct a city brand in harmony with the mountain territory. 相似文献
104.
Oriol Caselles Guillermo Martínez Jaume Clapés Pere Roca Maria de la Vega Pérez-Gracia 《International Journal of Architectural Heritage》2015,9(3):310-323
Determining the behavior of a structure estimated by means of finite elements analysis requires not only an in-depth knowledge of its geometry and dynamic properties but also an experimental validation to corroborate the adequacy of the characteristics of the structure. Most of the current structural identification techniques are based on linear methods that call for many measurement points and/or a relative simple structure. Complex structures are somewhat still an unexplored field due to the difficulties with the finite element method and the experimental corroboration of its results. This study presents the use of particle motion computation applied to each structural vibration mode to improve the identification of its dynamic properties, and its application to the Gothic Cathedral of Palma de Majorca (Spain). 相似文献
105.
Luís Mateus Maria do Rosário Veiga 《International Journal of Architectural Heritage》2015,9(4):430-442
The Algarve region in southern Portugal has one of the most significant rammed earth construction legacies in the country. This construction method is characterized by its high susceptibility to water damage and external renderings are essential to the longevity of these constructions. This study collects and organizes data that provides the basis for the conservation and repair of renderings. Five earth buildings from western Algarve were selected to represent this heritage and its diversity of composition and susceptibility to water damage. Some of their commonest anomalies result from the interaction between the earth substrate and the traditional external renderings, given their distinct characteristics and behavior. The selected sample is described and the mechanical strength of the rammed earth walls and their renderings are evaluated through in situ tests. Samples of the external renderings and earth substrate of the five buildings comprising the sample were also collected and characterized in the laboratory. The characteristics of these two materials and their behavior as an assembly were analyzed. The results of the in situ and laboratory tests are compared and the viability of using a method based on in situ tests for the wider characterization of the type of construction under analysis evaluated. 相似文献
106.
Italian district small and medium enterprises (SMEs) developed aggressive strategies to extend their sales networks and supply chains abroad. Literature on districts offered alternative explanations about the impacts of internationalization on local manufacturing systems. The authors consider the evolution of Italian districts in the framework of global value chain approach, focusing on the role of leading firms. Based on a survey of 650 Italian SMEs and financial indicators, the paper describes the rise of a new district firm model, the open network, which becomes a key node of global value chains. The paper also analyses the relationships among internationalization, innovation strategies and performance of SMEs. 相似文献
107.
Verônica Wesolowski Sheila Maria Ferraz Mendonça de Souza Karl J. Reinhard Gregório Ceccantini 《Journal of archaeological science》2010
To date, limited numbers of dental calculus samples have been analyzed by researchers in diverse parts of the world. The combined analyses of these have provided some general guidelines for the analysis of calculus that is non-destructive to archaeological teeth. There is still a need for a quantitative study of large numbers of calculus samples to establish protocols, assess the level of contamination, evaluate the quantity of microfossils in dental calculus, and to compare analysis results with the literature concerning the biology of calculus formation. We analyzed dental calculus from 53 teeth from four Brazilian sambaquis. Sambaquis are the shell-mounds that were established prehistorically along the Brazilian coast. The analysis of sambaqui dental calculi shows that there are relatively high concentrations of microfossils (phytoliths and starch), mineral fragments, and charcoal in dental calculus. Mineral fragments and charcoal are possibly contaminants. The largest dental calculi have the lowest concentrations of microfossils. Biologically, this is explained by individual variation in calculus formation between people. Importantly, starch is ubiquitous in dental calculus. The starch and phytoliths show that certainly Dioscorea (yam) and Araucaria angustifolia (Paraná pine) were eaten by sambaqui people. Araceae (arum family), Ipomoea batatas (sweet potato) and Zea mays (maize) were probably in their diet. 相似文献
108.
Maria Anna Pabst Ilse Letofsky-Papst Maximilian Moser Konrad Spindler Elisabeth Bock Peter Wilhelm M.D. Leopold Dorfer Jochen B. Geigl Martina Auer Michael R. Speicher Ferdinand Hofer 《Journal of archaeological science》2010
From a 1000-year-old mummy, found unwrapped in the sand of the desert at Chiribaya Alta in Southern Peru, two different kinds of tattoos were investigated: decorative tattoos displaying different animals and symbolic ciphers were present on the extremities and tattooed circles on the neck region. 相似文献
109.
This project intends to document graffiti identified on the walls of the defence system of San Juan, Puerto Rico, in a collaborative effort between the author and the National Park Service. The initial proposal envisaged a maximum of 8 or 9 ship drawings previously identified by the Park's personnel. Fieldwork has hugely expanded that number—so far over 400. Preliminary evaluation of the ship-types identified suggests the presence of a visual representation of ship-type evolution, at least from the 18th to the first half of the 20th centuries.
© 2006 The Author 相似文献
© 2006 The Author 相似文献
110.
Mireia Baylina Ferré Anna Ortiz Guitart Maria Prats Ferret 《Children's Geographies》2006,4(2):173-183
This paper presents the first results of a case study on the ways in which playgrounds are constructed and experienced in children's daily lives in two medium sized Mediterranean Catalan cities. The research is based on qualitative methodology through participant observation and interviews with institutional actors. Our research suggests that playgrounds are organised around age as the central category; nevertheless, gender is important in the use and activities developed as children get older. Specific aspects from Mediterranean and medium-sized cities are raised such as a positive perception and an intense use of public space by both adults and children. Specific childhood policies in city planning and a stronger gender awareness among institutional actors would improve the social role of playgrounds as participatory, socialising and inclusive spaces. 相似文献