全文获取类型
收费全文 | 1601篇 |
免费 | 239篇 |
国内免费 | 207篇 |
专业分类
电工技术 | 53篇 |
综合类 | 149篇 |
化学工业 | 35篇 |
金属工艺 | 23篇 |
机械仪表 | 143篇 |
建筑科学 | 120篇 |
矿业工程 | 14篇 |
能源动力 | 1篇 |
轻工业 | 25篇 |
水利工程 | 11篇 |
石油天然气 | 22篇 |
武器工业 | 11篇 |
无线电 | 172篇 |
一般工业技术 | 108篇 |
冶金工业 | 56篇 |
原子能技术 | 2篇 |
自动化技术 | 1102篇 |
出版年
2024年 | 4篇 |
2023年 | 15篇 |
2022年 | 33篇 |
2021年 | 40篇 |
2020年 | 53篇 |
2019年 | 52篇 |
2018年 | 31篇 |
2017年 | 50篇 |
2016年 | 67篇 |
2015年 | 71篇 |
2014年 | 106篇 |
2013年 | 107篇 |
2012年 | 134篇 |
2011年 | 134篇 |
2010年 | 106篇 |
2009年 | 104篇 |
2008年 | 120篇 |
2007年 | 143篇 |
2006年 | 138篇 |
2005年 | 112篇 |
2004年 | 92篇 |
2003年 | 75篇 |
2002年 | 60篇 |
2001年 | 33篇 |
2000年 | 39篇 |
1999年 | 27篇 |
1998年 | 20篇 |
1997年 | 14篇 |
1996年 | 10篇 |
1995年 | 11篇 |
1994年 | 8篇 |
1993年 | 14篇 |
1992年 | 3篇 |
1991年 | 6篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有2047条查询结果,搜索用时 15 毫秒
1.
Dirk Bühler 《Mauerwerk》2020,24(1):26-36
The Rank construction company and the introduction of brick vaults in Munich after 1945 The construction of vaults without scaffolding with thin bricks has a centuries‐old tradition, particularly in Spain and Italy. Since the beginning of the 19th century, it has been successfully spread mainly on the American double continent. The Rank Brothers construction company in Munich is known to date as one of those construction companies that began building with concrete in its home city very early on. New investigations, which were made possible above all by the provision of archive material by Paul Basiner, now point to an additional focus of this company's work. The architects and engineers of the company had been also able to familiarise themselves with this traditional Spanish brick‐vaulted construction method via the branch office in Spain, which was established from 1911 on. This knowledge was particularly in demand in the years following World War II, when the destroyed vaults had to be rebuilt with simple means and low material consumption. Together with Carl Sattler, who had become acquainted with similar construction methods in Italy, brick vaults were initially used to complete the construction of the Landeszentralbank in Munich. In the following years, Rank was able to provide many buildings in and around Munich with brick vaults. It was not until the 1960s that this construction technique went out of fashion and was thus somewhat forgotten. 相似文献
2.
3.
Interlock failure of combined sheet pile walls In addition to multiple combinations of king piles and intermediate sheet piles the installation method of combined sheet pile walls can differ as well. The installation has to adapt to the boundary conditions of the construction work considering soil conditions, profile and interlock system, interlock protection, driving equipment, driving assistance etc. Despite the established construction of combined sheet pile walls interlock failure occurs. In this paper, the installation aspects of combined sheet pile walls in northern Europe are compiled and analyzed for the occurrence of interlock failure. 相似文献
4.
Expansion of the branch channel to Salzgitter from SKS‐km 3,550 to 14,918 The branch channel to Salzgitter will be extended to the waterway category Vb in the next years. This will enable inland waterway vessels with a width of 11,45 m and a loaded draft of 2,80 m to run it without limitations. The reaches Wedtlenstedt and Üfingen will be extended in most areas to a trapezoidal cross section with a width at water level of 36,90 m and a water depth of 4,00 m. The exit basins of the locks will be extended on one side. Overall about 1 000 000 m2 of soil will be moved. About 300 000 m2 of clay sealing and 460 000 m2 of rip‐rap will be installed. Three culverts have to be replaced by new constructions to adapt to the new cross section of the channel. In addition two bridges will be modified to allow for a clearance of 5,25 m. At present the plan approval procedure is carried out. It is expected to achieve the plan approval order in 2017. The construction is planned to start in 2018. Completion is scheduled for 2024. 相似文献
5.
6.
工程量清单计价的合同贯穿在建设工程的实施过程中,如何在计价方式、风险约定、合同备案、合同的履行等方面进行管理,有利于《建设工程工程量清单计价规范》的推广和执行。 相似文献
7.
8.
就会计信息失真的屡查不止的恶劣现象,从主观和客观两方面分析了其原因,指出要彻底消除这一现象,既要不断提高会计人员的职业道德水平和业务素质,又要不断强化企业内部的制约和监督体系,加大执法力度。 相似文献
9.
电力工程建设概算定额是一套专业性定额,是全国各省市水厂电厂的工程项目建设(如水厂的铁皮沉淀池工程和电厂的循环水取排水系统工程等)在招投标领域中使用较为广泛的一套定额,笔者针对上述系列工程项目在实际执行该定额过程中的实质性问题,用实例来阐述在执行沉井工程定额过程中遇到的一些问题,并针对这些问题提出相对应的对策,以借鉴同行。 相似文献
10.
为解决故障装备检测过程存在的突出问题,提高检测任务的执行效率,降低任务执行过程中的复杂程度,在掌握一般检测任务执行过程的基础上,总结了现有故障装备检测过程中常见任务的不同类型;以检测过程中相互间具有约束关系的任务分解为研究对象,借鉴任务关联矩阵(TAM)等相关概念,提出了基于检测任务分解的评估方法和过程模型,从检测周期和资源占用2个角度实现了对检测任务分解程度的定性分析,对任务内聚性、耦合性以及均衡性的定量计算,最后通过实例验证了该方法和模型的可行性,为评估不同检测任务分解方案提供了参考。 相似文献