全文获取类型
收费全文 | 9027篇 |
免费 | 904篇 |
国内免费 | 561篇 |
专业分类
电工技术 | 233篇 |
综合类 | 964篇 |
化学工业 | 981篇 |
金属工艺 | 241篇 |
机械仪表 | 134篇 |
建筑科学 | 4008篇 |
矿业工程 | 583篇 |
能源动力 | 83篇 |
轻工业 | 81篇 |
水利工程 | 761篇 |
石油天然气 | 60篇 |
武器工业 | 31篇 |
无线电 | 214篇 |
一般工业技术 | 642篇 |
冶金工业 | 407篇 |
原子能技术 | 7篇 |
自动化技术 | 1062篇 |
出版年
2024年 | 41篇 |
2023年 | 221篇 |
2022年 | 404篇 |
2021年 | 379篇 |
2020年 | 337篇 |
2019年 | 224篇 |
2018年 | 188篇 |
2017年 | 215篇 |
2016年 | 212篇 |
2015年 | 311篇 |
2014年 | 622篇 |
2013年 | 440篇 |
2012年 | 626篇 |
2011年 | 683篇 |
2010年 | 636篇 |
2009年 | 674篇 |
2008年 | 561篇 |
2007年 | 675篇 |
2006年 | 523篇 |
2005年 | 469篇 |
2004年 | 409篇 |
2003年 | 317篇 |
2002年 | 284篇 |
2001年 | 199篇 |
2000年 | 162篇 |
1999年 | 137篇 |
1998年 | 92篇 |
1997年 | 85篇 |
1996年 | 62篇 |
1995年 | 48篇 |
1994年 | 34篇 |
1993年 | 22篇 |
1992年 | 37篇 |
1991年 | 20篇 |
1990年 | 11篇 |
1989年 | 10篇 |
1988年 | 6篇 |
1980年 | 5篇 |
1966年 | 6篇 |
1965年 | 9篇 |
1964年 | 17篇 |
1963年 | 12篇 |
1962年 | 3篇 |
1961年 | 8篇 |
1960年 | 6篇 |
1959年 | 5篇 |
1958年 | 5篇 |
1957年 | 3篇 |
1956年 | 3篇 |
1955年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
991.
本文通过对房屋基础因地道塌陷事故的处理,提出一种结构受力合理、施工便利、经济性好的基础加固新方法,供今后实际工程事故处理时参考。 相似文献
992.
Chao M. Huang Dong Zhu Xu Yuren Waltraud M. Kriven Chao Y. Yuh 《Materials Science and Engineering: A》1996,220(1-2)
A composite of O′SiAlON (Si2-xAlxN2-xO1+x, with x 0.14) reinforced with 20 vol.% SiC monofilaments was fabricated by hot-pressing, at 1600°C, for 2 h under 34 MPa pressure. The mechanical and interfacial properties of the composites, as-fabricated as well as post-oxidized, were, investigated. The composite exhibited a significant improvement in ultimate flexure strength (640 MPa) and work of fracture (42 kJ m−2) compared with that (350 MPa and 1.8 kJ m−2, respectively) of the monolithic material. These mechanical properties were slightly increased after the composite was heat treated for 24 h in air at 1200 and 1300°C. However, the composite exhibited a significant degradation in ultimate strength, while the work of fracture (WOF) remained unchanged after exposure in air at temperatures beyond 1400°C. The as-fabricated composite revealed a low interfacial shear strength (6.2 MPa) and a frictional sliding stress (3.2 MPa). After the composite was oxidized at elevated temperatures, the interfacial bonding and sliding stresses were reduced to noticeable extents, resulting from the degradation of the carbon coating layer of the SiC monofilaments. 相似文献
993.
The anisotropic nature of fibre reinforced composites leads to large stress concentrations around pin-loaded holes through standard weave cloths. Proper understanding of how this anisotropic nature affects the load distribution around holes can be utilised to reduce these concentrations if sufficient thought is given to the internal fibre geometry near to the hole. Such local reinforcements need not be highly complex and can be readily produced without excessive effort, producing significant improvements in performance. 相似文献
994.
本文综述了机械合金化Al-Al_3Ti材料的发展现状,论述了增强体Al_3Ti的性质和机械合金化制备的Al-Al_3Ti的组织与性能。采用机械合金化制备的Al-Al_3Ti具有理想的组织。相当高的强度与塑性,良好的热强性。目前对机械合金化制备的Al-Al_3Ti的研究不够深入,还需进行大量的工作。 相似文献
995.
柳襄怀 《有色金属材料与工程》1994,15(2):65-72
作者在多年实验工作的基础上,论述了离子束增强沉积薄膜合成及其在材料表面优化中的应用、所用设备、膜的合成、表面优化技术与机理,并展望了前景。 相似文献
996.
Typical finite element formulations and models for unidirectional composite materials are reviewed. The application of micromechanical finite element analysis to the modelling of unidirectional fibre-reinforced metal-matrix composites is demonstrated by presenting some studies from recent publications. It is shown that while analytical models offer a simple tool for obtaining the overall response of composites, finite element analysis provides more accurate and detailed characterisation of composite properties for complicated geometries and constituent property variations. Various effects that influence the stress/strain response and fibre/matrix deformation of composites are studied through modelling. These effects include the fibre coating and reaction layer, fibre shape and distribution, metallurgical and environmental factors, stress distributions and damage. It is demonstrated that the properties and constituent phase interaction of metal-matrix composites are best modelled by finite element analysis. It is emphasized that in order to obtain good predictions, the models must be coupled with first-hand characterisations of the constituent phases and their interactions, including the thermal history of the specimens. 相似文献
997.
深层搅拌水泥桩复合地基在工程中的应用 总被引:1,自引:0,他引:1
简要介绍了深层搅拌水泥桩的加固机理和适用条件。详细阐述了深层搅拌水泥桩的加固设计,其内容包括布桩形式,单桩竖向承载力及复合地基承载力的确定以及下卧层与沉降变形的验算。指出了施工中应注意的事项和应通过的质量检验项目,并通过工程实例进行了验证。 相似文献
998.
On the basis of generalization of the results of investigation of the operation of rodlike elements of composite materials, we make a conclusion that the influence of various factors on the deformability of these elements is studied incompletely. The comparison of the stress-strain states for different models of concrete and reinforced-concrete elements makes it possible to describe the effect of longitudinal reinforcement (coefficient of reinforcement, strength and deformation characteristics) on the critical level of strains in the cross section. According to the results of our investigations, we give recommendations concerning the evaluation of the critical value of the coefficient of reinforcement above which one may observe the effect of reinforcement on the deformability of the analyzed sections. It is shown that the compression strength of the brittle base of the composite with inhomogeneous structure decreases as a result of the fracture processes. It is also demonstrated that the existing procedure used for the evaluation of the indicated decrease in strength requires significant improvement. The problem of evaluation of the ultimate value of the coefficient of reinforcement is also analyzed. 相似文献
999.
粉喷桩处理软弱地基在祁临高速公路的应用 总被引:1,自引:1,他引:0
结合工程实例,介绍了粉喷桩的所属类型,粉喷桩对软弱地基加固的原因,所适应土质及加固特点,阐述了祁临十八合同段的粉喷桩施工过程及施工中应注意的若干问题,得出粉喷桩处理不良地基效果良好。 相似文献
1000.
物理层安全是无线通信实现安全通信的一种有效手段, 无人机基站在存在地面窃听者的情况下向地面合法用户传输机密信息时, 已有研究一般采用离线方法对无人机基站的飞行轨迹进行优化, 得到的轨迹是固定的, 保密传输缺乏应对通信环境变化的能力。针对该问题, 本文研究无人机飞行轨迹的在线优化策略, 使机密信息被安全传输的同时实现通信平均保密率最大化。文中采用了更符合实际的视距/非视距混合信道模型对空地通信链路进行建模, 提出一种基于Q-learning算法的保障无人机通信系统安全的飞行轨迹在线优化方法。仿真结果表明, 与两种基准算法相比, 本文提出的算法能够有效提高无人机通信的平均保密率。 相似文献