全文获取类型
收费全文 | 1222篇 |
免费 | 62篇 |
国内免费 | 127篇 |
专业分类
电工技术 | 301篇 |
综合类 | 61篇 |
化学工业 | 40篇 |
金属工艺 | 40篇 |
机械仪表 | 101篇 |
建筑科学 | 36篇 |
矿业工程 | 41篇 |
能源动力 | 62篇 |
轻工业 | 19篇 |
水利工程 | 4篇 |
石油天然气 | 8篇 |
武器工业 | 9篇 |
无线电 | 112篇 |
一般工业技术 | 31篇 |
冶金工业 | 18篇 |
原子能技术 | 312篇 |
自动化技术 | 216篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 23篇 |
2021年 | 26篇 |
2020年 | 22篇 |
2019年 | 18篇 |
2018年 | 15篇 |
2017年 | 37篇 |
2016年 | 59篇 |
2015年 | 45篇 |
2014年 | 120篇 |
2013年 | 100篇 |
2012年 | 102篇 |
2011年 | 141篇 |
2010年 | 124篇 |
2009年 | 123篇 |
2008年 | 78篇 |
2007年 | 80篇 |
2006年 | 92篇 |
2005年 | 61篇 |
2004年 | 39篇 |
2003年 | 32篇 |
2002年 | 26篇 |
2001年 | 14篇 |
2000年 | 14篇 |
1999年 | 6篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
排序方式: 共有1411条查询结果,搜索用时 0 毫秒
111.
介绍了SJA1000独立的CAN控制器的引脚、主要功能和通讯控制,为正确应用SJA1000与MCU组成CAN-BUS系统,增加可靠性提供了应用技巧。 相似文献
112.
《Journal of Nuclear Science and Technology》2013,50(12):1056-1062
Mesocarbon microbeads (MCMBs) heat-treated at 1,273 and 3,073 K were irradiated with an electron beam current density ~1.34μA/cm2 of 0.5–1.5 MeV for 0–600 s, and the irradiated MCMBs were examined as anode materials for secondary lithium-ion batteries. Charge capacity of both materials irradiated for short time within 100 s became larger than that before irradiation. Improvement of discharge capacity of MCMB annealed at 3,073 K was achieved by irradiation with 0.5 and 1.5 MeV electrons for 600 s. Good performance of cyclical discharge of MCMB annealed at 3,073 K was also attained by the irradiation with 0.5–1.5 MeV electrons for 600 s. 相似文献
113.
114.
针对井下人员定位系统中身份码发射器的实际情况,选择通信射频芯片cc1000及主控制器ATmega88V作为硬件设计的主体,并提出了一种基于RFID技术的身份码发射器的硬件设计方案.为井下人员定位系统的整体设计提供了一种设计参考. 相似文献
115.
116.
根据国家电网公司提供的交流特高压示范工程二次系统研究用关键参数与边界条件,采用输电线路分布参数法,理论计算晋东南—南阳—荆门交流示范工程充电合闸、不同位置故障的电流谐波分布,了解特高压1000kV交流输电短路的过渡过程可能出现的现象及对继电保护的影响,对1 000 kV交流示范工程的继电保护研究具有一定的指导意义。 相似文献
117.
Zidi Wang Kazuya Shibata Seiichi Koshizuka 《Journal of Nuclear Science and Technology》2018,55(5):461-477
The Fukushima nuclear accident raised the importance of flooding study in nuclear reactor buildings. It is known that the external flooding can be attributed to natural causes, while the internal flooding is caused by the piping ruptures, tank failure or the actuation of fire suppression systems. The building flooding process can damage the safety-related components and systems, which needs to study carefully. In order to simulate this phenomenon which is accompanied by complex flow with free surface, a particle method based on Lagrangian approach named explicit moving particle simulation (EMPS) method, is employed in this analysis. Verification and validation analyses are carried out. The verification problems are a hydrostatic analysis and a water spreading to investigate the differences of the particle wall and polygon wall boundary models, while the validation studies of two experiments of dam-break induced flooding show good agreements. Afterwards, the internal flooding process in AP1000 is simulated by assuming a break of the in-containment refueling water storage tank as an example. The results achieved so far indicate that the EMPS method is capable to simulate the internal flooding process in the nuclear reactor buildings. 相似文献
118.
119.
C. Liu 《Journal of Nuclear Materials》2004,335(1):77-82
About 380 μm thick specimens of low-activation martensitic stainless steel EUROFER97 were homogeneously implanted with protons below about 70 °C to concentrations up to about 1200 appm. Tensile tests were performed at 25 and 200 °C. The tests at 25 °C showed an increase of yield stress and ultimate tensile strength and a decrease of uniform elongation and elongation to fracture, while effects at 200 °C were strongly reduced. Scanning electron microscopy showed virtually no change of the ductile, transgranular fracture mode by the implanted H. A slight decrease of necking was observed only at the highest concentrations. The results are compared to previous measurements on F82H-mod and to literature results on tensile tests after He implantation and neutron irradiation. F82H-mod specimens were also implanted under applied tensile stress to concentrations up to 1900 appm. Straining was ascribed to accumulation of atomic defects, but no fracturing occurred. Thermal desorption measurements are included on H-implanted and tensile tested F82H-mod specimens. The results show significant data scatter, even within one specimen, with the highest measured values being in accordance with the implanted amount. In general, the H content is decreased after testing at higher temperatures, but even after testing at 350 °C, some specimens contain significant amounts. 相似文献
120.
全球首批三代核电AP1000核岛采用模块化施工技术,可产生巨大的经济效益,大件吊装技术是其关键技术之一。针对AP1000核岛的吊装施工过程存在的吊装方案制订、吊装过程动态模拟、吊装过程吊件等结构分析、以及吊装运输碰撞检测等多重问题,指出运用建筑信息模型(BIM)技术实现大件吊装仿真的必要性。在简要介绍BIM技术的基础上,提出基于BIM技术的吊装施工动画仿真模拟平台;给出了吊车的BIM模型的定义方法;并介绍了利用BIM模型来进行基于3DS Max软件的三维动画模拟和基于ANSYS有限元软件对吊件等进行结构分析的方法。 相似文献