全文获取类型
| 收费全文 | 2542篇 |
| 免费 | 17篇 |
专业分类
| 2559篇 |
出版年
| 2025年 | 1篇 |
| 2024年 | 9篇 |
| 2023年 | 23篇 |
| 2022年 | 33篇 |
| 2021年 | 48篇 |
| 2020年 | 98篇 |
| 2019年 | 32篇 |
| 2018年 | 49篇 |
| 2017年 | 37篇 |
| 2016年 | 32篇 |
| 2015年 | 73篇 |
| 2014年 | 61篇 |
| 2013年 | 137篇 |
| 2012年 | 136篇 |
| 2011年 | 203篇 |
| 2010年 | 185篇 |
| 2009年 | 240篇 |
| 2008年 | 184篇 |
| 2007年 | 187篇 |
| 2006年 | 185篇 |
| 2005年 | 182篇 |
| 2004年 | 40篇 |
| 2003年 | 85篇 |
| 2002年 | 76篇 |
| 2001年 | 51篇 |
| 2000年 | 46篇 |
| 1999年 | 35篇 |
| 1998年 | 17篇 |
| 1997年 | 11篇 |
| 1996年 | 16篇 |
| 1995年 | 14篇 |
| 1994年 | 6篇 |
| 1993年 | 12篇 |
| 1992年 | 4篇 |
| 1991年 | 5篇 |
| 1990年 | 3篇 |
| 1989年 | 1篇 |
| 1980年 | 1篇 |
| 1979年 | 1篇 |
排序方式： 共有2559条查询结果，搜索用时 0 毫秒
151.
152.
In the last fifty years Chinese spatial inequalities have expanded in phases of industrial expansion and contracted in phases favourable to agriculture. Since 1985 real per capita disposable income and real per capita expenditure have increased rapidly in all parts of China. The increases were however much greater (i) in areas on the east coast than in the centre, northeast and west creating widening macro-territorial inequalities, (ii) in some provinces rather than others increasing inter-provincial inequalities and (iii) in urban areas rather than rural areas. These imbalances have seen the adoption of a succession of policies designed initially to promote a more equilibrated model of co-ordinated national development and more recently a more sustainable and more equitable development path consistent with the more recent emphasis on the goal of harmonious development. This paper examines the evolution and impact of these trends in inequality and policy initiatives paying attention to a variety of geographical scales. 相似文献
153.
Based on Morison hydrodynamic force theory, a simplified calculation method for hydrodynamic force to slender structures is proposed. A typical cylindrical deep water pile was chosen for study and the simplified method was used to analyze the influence of hydrodynamic pressure on the pile. Then the finite element method was used to study the dynamic characteristics of the model, and the results from both methods were compared. A comparison was also made between the shaking table test on the south tower of the Nanjing Yangtze 3rd River Bridge and the results from the simplified method. 相似文献
154.
For the requirement of pounding analysis of highway bridges, how to properly choose the impact stiffness has become a primary issue for an achieving accurate result. This article presents an evaluation test of the impact stiffness of four types of contact-element models based on the shaking table test results of a steel highway bridge model. The analytical results indicate that the theoretical impact parameters are significantly larger than the identified values because the assumptions for deriving those models cannot match the actual impact conditions. The possible reasons causing those differences are discussed at the end of this study. 相似文献
155.
The application of superelastic Shape Memory Alloy (SMA) reinforcement in plastic hinge regions of bridge piers has been proven to reduce the residual displacement after a strong shaking owing to its unique shape recovery characteristics; however, the maximum deformation of the piers could increase due to the relatively lower modulus of elasticity of SMA bars and lower hysteretic energy dissipation capacity. In this context, this article applies a recently formulated probabilistic performance-based seismic assessment methodology that considers both the maximum and the residual deformation simultaneously to evaluate the performance of SMA reinforced bridge piers. 相似文献
156.
台湾学者邢义田对古代罗马史素有研究,编译过资料选集,写作过专题论文和有关书评,翻译过重要文献,发表过考古调查报告,现场拍摄过文物照片。这些成果中有的内容为大陆史学界少见,因此颇具参考价值。 相似文献
157.
冷战结束后,论者多认为雅尔塔体系已经\"崩溃\"。但是从国际体系的视角来看,这种提法并不正确。它混淆了国际体系、国际格局和国际秩序这三个概念,与当代国际关系发展的实践也不相符合①。国际体系、国际格局和国际秩序并不是一回事,国际格局的崩溃,并不就等于国际体系的崩溃;冷战的结束,只是美苏两极格局的寿终正寝,而不是雅尔塔体系的崩溃。雅尔塔体系是在吸取了人类数百年来建立国际体系的经验教训、特别是吸收了凡尔赛——华盛顿体系的经验教训基础上,建立的一个机制较为完善、国际秩序相对稳定的国际体系。冷战结束后,这个体系不仅没有崩溃,而且还有发展,有力地维护着第二次世界大战后世界的均势与和平②。 相似文献
158.
《真定十方临济慧照玄公大宗师道行碑铭》浅谈 总被引：1，自引：1，他引：0
《真定十方临济慧照玄公大宗师道行碑铭》是与正定临济寺有关的现有碑文资料中时代最早者,也是唯一一通专门为临济宗创始人义玄大宗师所立之碑。原碑早年已佚,日本佛教临济宗访华团于20世纪80年代赠送给正定有关部门的相关碑文资料对佛教临济宗及正定临济寺的研究具有重要的史料价值。 相似文献
159.
Gang Li 《Alcheringa: An Australasian Journal of Paleontology》2013,37(3):305-316
Two spinicaudatan species, Triglypta eedemtensis Li sp. nov. and Dundgobiestheria mandalgobiensis Li gen. et sp. nov., are described on the basis of scanning electron microscopy (SEM) imaging of newly collected specimens from paper-thin laminated black shale of the Eedemt Formation exposed at the Eedemt locality in the Khootiin Khotgor coal mine region of Dundgobi Province in southeast Mongolia. Triglypta eedemtensis is ornamented mainly with puncta and a punctate fine reticulum; radial lirae occur only on two or three growth bands near the venter. The small spinicaudatan Triglypta is a common component of the Middle Jurassic Euestheria ziliujingensis fauna and Sinokontikia fauna, and is a typical taxon in the Middle Jurassic lacustrine sequences of northern Hebei and the Junggar and Turpan basins of the Xinjiang Autonomous District of China; however, it does not occur in stratigraphically higher units elsewhere. Therefore, the age of the Eedemt Formation should be considered Middle Jurassic rather than Early Cretaceous. The Eedemt Formation is much older than the Early Cretaceous Shinekhudag Formation in the Shine Khudag area of southeast Mongolia. 相似文献
160.
Li‐jung Wang 《International Journal of Cultural Policy》2013,19(2):171-185
This article will explore the multicultural challenges resulting from increasing numbers of migrant workers and foreign (non‐Chinese) brides in Taiwan, and discuss how such outside cultural influences create new forms of cultural expression, identity and citizenship. It will further describe experiences and present theories specific to Taiwan’s experience. Research on “transnational communities” is fairly advanced in Taiwan. “Transnational communities” in Taiwan are expected to “assimilate” quickly into mainstream Taiwanese society, and personal cultural needs and influences are largely ignored. These communities continue to remain isolated from mainstream Taiwanese society, thus making them “invisible” to society as a whole. Therefore, this research hopes to encourage research into “transnational communities” within the field of cultural policy studies and provide a basic picture of the cultural influence and development of these communities in Taiwan. 相似文献