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   5027篇
  免费   250篇
  2023年   35篇
  2020年   98篇
  2019年   112篇
  2018年   181篇
  2017年   185篇
  2016年   215篇
  2015年   138篇
  2014年   154篇
  2013年   1426篇
  2012年   158篇
  2011年   189篇
  2010年   191篇
  2009年   142篇
  2008年   123篇
  2007年   125篇
  2006年   120篇
  2005年   81篇
  2004年   62篇
  2003年   63篇
  2002年   62篇
  2001年   77篇
  2000年   65篇
  1999年   77篇
  1998年   53篇
  1997年   40篇
  1996年   33篇
  1995年   45篇
  1994年   31篇
  1993年   40篇
  1992年   27篇
  1991年   36篇
  1990年   40篇
  1989年   39篇
  1988年   28篇
  1987年   41篇
  1986年   40篇
  1985年   46篇
  1984年   52篇
  1983年   47篇
  1982年   40篇
  1981年   44篇
  1980年   42篇
  1979年   39篇
  1978年   36篇
  1977年   35篇
  1975年   27篇
  1974年   27篇
  1973年   29篇
  1972年   29篇
  1970年   27篇
排序方式: 共有5277条查询结果,搜索用时 15 毫秒
951.
Abstract

This paper addresses questions of women’s visibility in constructed histories, as well as levels of recognition concerning their participation in politics through historical narratives. In particular, historical narratives representing women in protest in the context of waterfront heritage zones associated with the shipbuilding industry are examined, based on examples of two public art projects: Strong Women of the Clydeside: Protests and Suffragettes from Govan’s Hidden Histories led by the artist t s Beall in the Govan area of Glasgow, Scotland and Shipyard is a Woman by Arteria Association and Metropolitanka in Gdansk, Poland.  相似文献   
952.
The article examines the first official, national Holocaust memorial day in Italy, the so-called Giorno della memoria (Day of memory), marked on the 56th anniversary of the liberation of Auschwitz on 27 January 2001. It looks at the ways in which the day acted as a filter for issues of national collective memory and identity, in particular state and public negotiation of the legacy of Fascism, as well as addressing broader issues of Holocaust remembrance. The article looks first at the origins of the Giorno della memoria in political and in legislative terms. Then it sketches in the events of the day itself, at national and local levels, in political, educational and cultural terms. This is followed by an analysis of media coverage and contemporary commentary, showing how various lines of interpretation addressed general issues related to the Holocaust and specifically Italian historical, ideological and contemporary questions.  相似文献   
953.
This article offers an account of a recent debate in the cultural pages of the Italian press on a polemical work of literary criticism entitled Pasolini contro Calvino, in which the two authors are shown to represent emblematically different attitudes towards literature, cultural institutions and the culture industry in post‐war Italy. The debate surrounding this claim is examined in substance, but also as an illustration of the workings of culture in 1990s Italy.  相似文献   
954.
955.
A model is proposed for the incremental force-deformation behaviour of reinforced concrete sections and members, under generalised load or deformation histories in 3D, including cyclic loading, up to ultimate deformation. At the section level the model is of the Bounding Surface type and accounts for the coupling between the two directions of bending and between them and the axial direction. For the construction of the member tangent flexibility matrix on the basis of the section tangent flexibility matrix, a piecewise-linear variation along the member is assumed for the nine terms of the tangent section flexibility matrix. Model parameters are derived on the basis of available test results for: (a) the force-deformation response under cyclic biaxial bending with normal force; (b) the hysteretic energy dissipation; (c) the secant-to-yield member stiffness, and (d) the ultimate deformation of the member under cyclic biaxial load paths.  相似文献   
956.
A sliding mode control theory is presented to control the response of building frames to predominant frequency components of the random ground motions. The control algorithm is derived based on a sliding surface which is a function of a state vector containing the structural displacements and velocities and variables that dictate the predominant frequency components of the excitation. Three control mechanisms are employed to control the response of the building frame namely, (1) active mass damper (AMD) placed at the top storey of the building, (2) an actuator placed at a storey level and, (3) an actuator placed at a storey level along with a tuned mass damper (TMD) situated at the top storey level. Responses obtained by the proposed control strategy are compared with those obtained by the linear feedback and feedforward-feedback control strategies (conventional control strategies). Also, they are compared with those obtained by the sliding mode control strategy that considers in its state vector only structural displacements and velocities. It is shown that the proposed control strategy generally performs better than other control strategies in the higher range of control forces. For the lower range of control forces, conventional control strategies are more effective.  相似文献   
957.
In this paper a method for the identification of simplified linear models for building structures is applied to the case when acceleration, rather than displacement, is measured. A frame from benchmark structural controller studies is simulated, and from the input-output data of these simulations, simplified models for the acceleration response of the frame are obtained that have far fewer degrees of freedom. One of these simplified models is used to design a controller, which is tested using an evaluation model from the benchmark controller studies and found to be effective.  相似文献   
958.
An experimental study on half-scale brick-masonry models with different strengthening and retrofitting measures has been studied under cyclic loading in a quasi-static test facility. The strengthening measures undertaken for the studies axe the horizontal bond beam at the lintel and sill level with a combination of vertical reinforcement at corners and openings. The retrofitting measures studied are grouting with epoxy-sand-mortar and cement-grout-injection with welded wire mesh in the cracked region. The tests reveal that the horizontal bond beam at lintel level with vertical reinforcement is effective in reducing the cracking above the lintel level. The insertion of an additional sill-band signi-ficantly reduces the cracking in walls. The epoxy-sand-mortar techniques for retrofitting of cracked regions prove to be effective enough to restore the initial strength, stiffness and deformation capacity. Although specimen retrofitted with cement-grout-injection with welded wire mesh is effective to regain the ultimate strength yet the brittle failure is observed as the specimen is stressed beyond the elastic limit.  相似文献   
959.
The recent drive for use of performance based methodologies in design and assessment of structures in seismic areas has significantly increased the demand for the development of reliable nonlinear inelastic static pushover analysis tools. As a result, the recent years have witnessed the introduction of the so-called adaptive pushover methods, which, unlike their conventional pushover counterparts, feature the ability to account for the effect that higher modes of vibration and progressive stiffness degradation might have on the distribution of seismic storey forces. In this paper, the accuracy of these force-based adaptive pushover methods in predicting the horizontal capacity of reinforced concrete buildings is explored, through comparison with results from a large number of nonlinear time-history dynamic analyses. It is concluded that, despite its apparent conceptual superiority, current force-based adaptive pushover features a relatively minor advantage over its traditional non-adaptive equivalent, particularly in what concerns the estimation of deformation patterns of buildings, which are poorly predicted by both types of analysis.  相似文献   
960.
This article presents a design methodology for seismic upgrading of existing reinforced concrete (RC) buildings. The methodology is based on the modification of the deflected shape of the structure so as to achieve a near-uniform distribution of interstorey drift along the building height, thereby eliminating damage localization. Yield Point Spectra are utilized for the definition of demand and a direct displacement-based design approach is implemented. The fundamental steps of the method are described in detail, including a systematic evaluation of assumptions and limitations. A full-scale tested structure is used as a case study for assessment and verification of the proposed methodology. Alternative retrofit scenarios are set according to target response and performance levels. The role of the target deflected response shape and its influence on the outcome of the retrofit strategy is investigated. The viability of the alternative retrofit scenarios is studied for different ground motions including near-fault earthquake records.  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