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   2121篇
  免费   130篇
  2251篇
  2023年   8篇
  2021年   23篇
  2020年   36篇
  2019年   145篇
  2018年   80篇
  2017年   91篇
  2016年   151篇
  2015年   105篇
  2014年   100篇
  2013年   386篇
  2012年   113篇
  2011年   123篇
  2010年   98篇
  2009年   76篇
  2008年   89篇
  2007年   92篇
  2006年   55篇
  2005年   28篇
  2004年   54篇
  2003年   38篇
  2002年   28篇
  2001年   28篇
  2000年   32篇
  1999年   16篇
  1998年   19篇
  1997年   22篇
  1996年   16篇
  1995年   24篇
  1994年   17篇
  1993年   8篇
  1992年   6篇
  1991年   7篇
  1990年   4篇
  1987年   6篇
  1986年   4篇
  1985年   6篇
  1984年   8篇
  1983年   11篇
  1982年   10篇
  1980年   8篇
  1979年   10篇
  1978年   7篇
  1977年   9篇
  1976年   9篇
  1975年   7篇
  1974年   3篇
  1973年   3篇
  1972年   4篇
  1971年   3篇
  1968年   3篇
排序方式: 共有2251条查询结果,搜索用时 0 毫秒
991.
The former colonial port cities of Southeast Asia are complex in both their landscapes and their collective memories. Centuries of European imperial domination have left a mark on their townscapes and, more so in some cases than in others, on their contemporary political and social cultures. During the colonial period, the integration of these port cities into global trade networks also fostered inter‐ and intra‐regional migration and, thus, the development of complex cultural mixes in their demographic composition. In recent decades, and following the attainment of political independence, this region has experienced spectacular economic growth and the development of a range of nationalisms, both of which have had a considerable impact on the recent transformation of their (capital) cityscapes. Singapore and Jakarta are presented here as case studies of the ways in which economic, political and cultural forces have interacted to produce cityscapes in which elements of the past are variously eliminated, hidden, privileged, integrated and/or reinvented.  相似文献   
992.
    
Despite the growing interest in Eastern European countries since the fall of the communist regimes in the late 1980s, they still remain obscure to Western Europeans. Media information on Eastern Europe focuses mainly on politics or the attractions of holiday resorts and, consequently, the history and local customs of the countries, their cultural affairs and different cultural institutions are little known. This paper describes the way Bulgarian museums developed during the governance of the Bulgarian Communist Party (1946–1989). It is hoped that revealing information on their operations within a broad historical and social context will lead to a better understanding of the country’s cultural affairs at a time when Bulgaria has become the latest member of the European Union. The findings are a result of PhD research.  相似文献   
993.
    
The senses act as the interface between self and environment, but in a western context powerful multisensory stimulation is increasingly constructed as marginal, deviant or in need of management/commodification. This paper brings together work on the sensory with ideas around affective intensity to explore the regulation of the individual through the senses. The notion of sensory discipline is developed through an examination of everyday commuter cycling. Based on innovative, mobile audio diaries, the intensities of sensory stimulation for the cycling body are explored. The paper concludes that commuter cycling enacts a minor resistance towards efforts to reduce the intensities of everyday affective landscapes. In turn, this resistance suggests just how pervasive sensory discipline has now become.  相似文献   
994.
The management of urban stormwater and flooding is challenging, particularly within older, post‐industrial urban environments where infrastructure, housing and businesses already operate. The urban environment constrains opportunities for the development and integration of new approaches to drainage management, particularly the use of sustainable drainage systems (SuDS). These issues are investigated through a case study of Glasgow. The northeast of the city suffered significant urban flooding in July 2002 following an intense con‐vective summer storm. This event overloaded the urban drainage system, which was heavily integrated and led to the back flow of foul water into streets and homes. This study examines the response to this event and the construction of an integrated drainage management plan for the city, the Glasgow Strategic Drainage Plan (GSDP), which includes greater use of SuDS in tackling the city's capacity problems. Reflecting on the interdisciplinary nature of urban drainage management, this study adopts a social science method, undertaking semi‐structured interviews with key actors involved in producing the GSDP.  相似文献   
995.
    
Historical landscape paintings are widely used to reconstruct past environments. However, artists did not necessarily fully depict reality, many exercising license to relocate and remould features. This paper applies photogrammetric techniques to the problem of determining the accuracy of artistic depictions of landscapes. Four 19th century paintings of Hobart, Tasmania, Australia by different artists were used to test the methods. The artists varied in their accuracy, with Frankland, the surveyor, being the most accurate, and Glover, the romantic professional artist, being the least accurate. This variation suggests that the use of paintings for historical reconstructions and measurements of historic features should be preceded by an accuracy assessment.  相似文献   
996.
    
Accurate mapping of land use/cover conditions provides essential information for managing natural resources and is critical for further examination of land use/cover change and its subsequent impacts on the environment. Remote sensing offers a means of acquiring land use/cover data in a timely manner, with optical remote sensing images commonly being used in land use/cover related studies. The persistent cloud cover during the rainy season in Southeast Asia, however, presents a challenge for using optical images in land use/cover mapping. Integrating multi‐sensor images of different spectral domains is thus desirable because more information can be extracted to improve the mapping accuracy. The purpose of this study is to assess the potential of using multi‐sensor data sets for land use/cover mapping in a tropical mountainous area in northern Thailand. Optical data from Landsat Thematic Mapper, radar images from Advanced Land Observing Satellite/Phased Array type L‐band Synthetic Aperture Radar (PALSAR), and topographical data were used, providing complementary information on land use/cover. Classification and accuracy assessment were conducted for 12 different combinations of the data sets. The results suggested that short crop mapping using multi‐temporal Phased Array type L‐band Synthetic Aperture Radar images offered insights into the distributions of crop and paddy fields. Because of the mountainous environment of the study area, combining topographic data of elevation and slope into the classification greatly reduced the confusion between different land use/cover types. Improvement of classification accuracy was evident especially in separating evergreen and deciduous forests from other vegetation types and discriminating urban village and the fallow field classes.  相似文献   
997.
    
Urban water was supplied to the Roman city of Forum Julii (Fréjus, southeastern France) for at least 200 years by a 39.4 km long aqueduct, operating in ad 50. Two perennial springs were successively collected, the Foux and the Siagnole, located at the outlet of Triassic and Jurassic karstic reservoirs, respectively. In this study, we performed high‐resolution PIXE (Particle‐Induced X‐ray Emission) measurements of Ca, Si, Fe and Sr concentrations on selected cross‐sections of laminated carbonate sampled along the sidewalls, before and after the connection of the two collection channels. Seasonal variations of water composition, suspended sediment load and discharge are recorded by alternating clear and dark layers, and can be traced by their Sr and Fe contents. On the basis of an annual bimodal high‐discharge regime for the two karstic reservoirs, the concentration measurements allow the derivation of a chronological record (117.5 years) of water supply and maintenance activities for a part of the operational period of the aqueduct. The water level in the channel was mainly controlled by the extent of carbonate deposition and by dredging, repair and maintenance operations rather than by the past hydrological regime of the two springs.  相似文献   
998.
    
The aim of the present work is to characterize plasters from Ptolemaic baths recently discovered in front of the Karnak temple complex, by the excavations of an Egyptian–French team. The characterization was carried out by means of optical microscopy (OM), scanning electron microscopy (SEM) equipped with an energy‐dispersive X‐ray detector (EDS), X‐ray diffraction analysis (XRD) and Fourier transform infrared spectroscopy (FT–IR). The results allowed the identification of the chemical composition and structure of these plasters. In addition, samples of red, yellow, black and white pigments were examined and identified. The results helped in providing an image concerning some materials used during the Ptolemaic era in ancient Egypt.  相似文献   
999.
    
Ancient DNA (aDNA) analysis was employed to determine the sex of slave sacrifice victims from Qin State tombs during the Spring and Autumn Period of China. It is difficult to obtain sex information from fragmentary skeleton samples with the aid of skeletal morphology methods. aDNA was extracted from the dentine in selected tooth samples of sacrificial slaves using a modified traditional method, which combines together phenol/chloroform extraction, silicon dioxide adsorption and ultrafiltration concentration. Based on the sequence differences between the amelogenin homologous gene in the X and that in the Y chromosome, a pair of specific primers was designed to identify the sex of the selected samples. In the selected eight typical samples, the aDNA analytical results revealed that three were males and two were females. These findings indicate that molecular sex identification might provide more valuable information for archaeological research on the institution of slave sacrifice in the Spring and Autumn Period of China.  相似文献   
1000.
    
Based on a case study of the South Korean automobile industry, this article explores the qualitative shift in employment practices implied by the expansion of contract labour from peripheral services to the main production activities of firms. This new phenomenon involves the greater integration of labour contracting into the production process, together with changes in employment practices and the rights of workers, which poses a challenge to our conventional understanding of labour contracting. The findings of the present study address the importance of investigating the issue of employment relationships and analysing the roles played by workplace actors in order to better understand the process of change in labour contracting and the consequences of increased numbers of non‐standard workers in the workplace. By revealing both the cooperation and the conflicting interests between workplace actors, the study highlights the sources of tension and contradiction associated with changes in labour contracting arrangements and the subsequent restructuring of the workplace.  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