全文获取类型
| 收费全文 | 202篇 |
| 免费 | 2篇 |
专业分类
| 204篇 |
出版年
| 2021年 | 3篇 |
| 2020年 | 5篇 |
| 2019年 | 5篇 |
| 2018年 | 5篇 |
| 2017年 | 7篇 |
| 2016年 | 5篇 |
| 2015年 | 5篇 |
| 2014年 | 6篇 |
| 2013年 | 28篇 |
| 2012年 | 9篇 |
| 2011年 | 14篇 |
| 2010年 | 13篇 |
| 2009年 | 15篇 |
| 2008年 | 12篇 |
| 2007年 | 6篇 |
| 2006年 | 11篇 |
| 2005年 | 7篇 |
| 2004年 | 4篇 |
| 2003年 | 5篇 |
| 2002年 | 5篇 |
| 2001年 | 6篇 |
| 2000年 | 8篇 |
| 1999年 | 1篇 |
| 1998年 | 1篇 |
| 1997年 | 3篇 |
| 1996年 | 2篇 |
| 1995年 | 4篇 |
| 1994年 | 1篇 |
| 1993年 | 1篇 |
| 1992年 | 1篇 |
| 1990年 | 1篇 |
| 1983年 | 1篇 |
| 1982年 | 1篇 |
| 1979年 | 1篇 |
| 1970年 | 2篇 |
排序方式： 共有204条查询结果，搜索用时 0 毫秒
81.
82.
Shuenn-Yih Chang 《Journal of Earthquake Engineering》2013,17(7):955-969
The feasibility of using pseudodynamic techniques to yield shock responses from impulses is studied herein. A direct integration method is often used to solve the force equation of motion in performing a conventional pseudodynamic test. However, this technique might not be applicable to obtain an accurate shock response from an impulse as a load discontinuity occurs at the end of the impulse. This is because this discontinuity will lead to an extra amplitude distortion and the amount of this amplitude distortion is increased with the increase of time step. Hence, a small time step is needed to reduce the extra amplitude distortion and thus the displacement increment for each time step might be smaller than or as small as the resolution of the displacement transducer. As a result, the displacement increment cannot be accurately imposed upon the specimen and the responses will be contaminated by the noise. In addition, the test duration is drastically increased. Alternatively, this difficulty might be overcome if the momentum equation of motion instead of the force equation of motion is solved pseudodynamically. Hence, an external momentum is used in the solution of the momentum equation of motion. Since the external momentum is a resultant of the time integration of the external force the discontinuity problem will automatically disappear. Consequently, reliable shock responses can be obtained from pseudodynamic tests. 相似文献
83.
Jong‐Woon Lee 《Development and change》2011,42(5):1241-1268
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
84.
由钟敬文担任顾问、周星、邱立担纲主编的《中华民俗丛书》首批四种,已于近日由中央民族大学出版社出版发行,它们是《闹洞房》(尚会鹏著)、《抢婚》(叶涛、吴存浩著)、《姓名》(纳日碧力戈著)、《谐音民俗》(张廷兴著). 相似文献
85.
常书鸿先生40年代只身前往敦煌 ,在极其艰难困苦的条件下 ,对敦煌莫高窟进行了卓有成效的保护 ,并开展了临摹研究等一系列工作 ,终于迎来了敦煌的解放和中华人民共和国的成立。为了事业 ,他吞下了妻离子散的苦果 ,心血沥沥 ,饱尝艰辛。他以牺牲个人幸福为代价 ,保护了祖国优秀文化遗产。全国解放初期 ,中央即决定在北京举办“敦煌艺术展览” ,周总理亲临参观指导并对他进行了亲切表彰勉励 ,中央人民政府政务院文教委员会为敦煌文物研究所颁发了时任政务院副总理的郭沫若先生亲笔书写的奖状。 相似文献
86.
87.
88.
89.
90.