全文获取类型
收费全文 | 51篇 |
免费 | 10篇 |
专业分类
综合类 | 1篇 |
化学工业 | 13篇 |
金属工艺 | 4篇 |
机械仪表 | 2篇 |
建筑科学 | 5篇 |
矿业工程 | 2篇 |
轻工业 | 1篇 |
水利工程 | 6篇 |
无线电 | 11篇 |
一般工业技术 | 13篇 |
冶金工业 | 1篇 |
原子能技术 | 1篇 |
自动化技术 | 1篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 2篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 1篇 |
2014年 | 6篇 |
2012年 | 5篇 |
2011年 | 17篇 |
2010年 | 2篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2003年 | 1篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
排序方式: 共有61条查询结果,搜索用时 69 毫秒
1.
介绍消失模工艺生产Dg75闸阀阀体铸件的铸造工艺,生产过程中铸件重要装配尺寸精度的保证,铸件表面粗糙度、铸件表面碳夹杂缺陷及表面皱皮现象控制等试验情况。通过模具结构设计、成型工艺及参数的调整、浇注工艺的调整、陶瓷成型浇道的应用等措施,使铸件表面质量及尺寸精度符合客户验收标准。同时使铸件表面因轻微缺陷的返修率由试验初期的90%下降到10%以内,产品合格率达到99%。 相似文献
2.
3.
4.
Linrui Hou Changzhou Yuan Diankai Li Laifa Shen Xiaogang Zhang 《Materials Letters》2011,65(17-18):2632-2634
Co-functionalized titanate nanotubes (Co-Ti-NTs) were successfully synthesized by means of an ion-exchange reaction. In contrast to the pristine titanate nanotubes (Ti-NTs), Co-Ti-NTs retained rich porous channels and owned even larger specific surface area and better electronic conductivity, which rendered electrons and OH? ions easily contact the Co species uniformly distributed on their surfaces for energy storage at high rates. The Co-Ti-NTs delivered a specific capacitance (SC) of 124 F g?1 at 0.4 A g?1, and a SC degradation of ca. 7% after 1500 continuous cycling at 3 A g?1, indicating that the Co-Ti-NTs were good candidates and/or even good supports for other electroactive materials for supercapacitors application. 相似文献
5.
6.
Magneto-opticCurrentSensorBasedonTotalReflectionsinaQuadrangularBulkGlass¥CHENXikun;QIUJinghe;ZHUQibiao;DAILaifa(ShanghaiUniv... 相似文献
7.
Peapod‐like Li3VO4/N‐Doped Carbon Nanowires with Pseudocapacitive Properties as Advanced Materials for High‐Energy Lithium‐Ion Capacitors 下载免费PDF全文
Laifa Shen Haifeng Lv Shuangqiang Chen Peter Kopold Peter A. van Aken Xiaojun Wu Joachim Maier Yan Yu 《Advanced materials (Deerfield Beach, Fla.)》2017,29(27)
Lithium ion capacitors are new energy storage devices combining the complementary features of both electric double‐layer capacitors and lithium ion batteries. A key limitation to this technology is the kinetic imbalance between the Faradaic insertion electrode and capacitive electrode. Here, we demonstrate that the Li3VO4 with low Li‐ion insertion voltage and fast kinetics can be favorably used for lithium ion capacitors. N‐doped carbon‐encapsulated Li3VO4 nanowires are synthesized through a morphology‐inheritance route, displaying a low insertion voltage between 0.2 and 1.0 V, a high reversible capacity of ≈400 mAh g?1 at 0.1 A g?1, excellent rate capability, and long‐term cycling stability. Benefiting from the small nanoparticles, low energy diffusion barrier and highly localized charge‐transfer, the Li3VO4/N‐doped carbon nanowires exhibit a high‐rate pseudocapacitive behavior. A lithium ion capacitor device based on these Li3VO4/N‐doped carbon nanowires delivers a high energy density of 136.4 Wh kg?1 at a power density of 532 W kg?1, revealing the potential for application in high‐performance and long life energy storage devices. 相似文献
8.
有效运用多媒体远程教育现代化的教学手段,关键是要设计和制作出大量符合教学要求、丰富多样、引人入胜且符合国际通用标准的多媒体网络课件。将Articulate这个简单专业的软件与易用的PowerPoint相结合,必将对教育培训的发展产生积极影响。 相似文献
9.
10.
Changzhou Yuan Long Yang Linrui Hou Jiaoyang Li Yaxin Sun Xiaogang Zhang Laifa Shen Xiangjun Lu Shenglin Xiong Xiong Wen Lou 《Advanced functional materials》2012,22(12):2560-2566
A facile one‐step hydrothermal method is developed for large‐scale production of well‐designed flexible and free‐standing Co3O4/reduced graphene oxide (rGO)/carbon nanotubes (CNTs) hybrid paper as an electrode for electrochemical capacitors. Densely packed unique Co3O4 monolayer microsphere arrays uniformly cover the surface of the rGO/CNTs film. The alkaline hydrothermal treatment leads to not only the deposition of Co3O4 microspheres array, but also the reduction of the GO sheets at the same time. The unique hybrid paper is evaluated as an electrode for electrochemical capacitors without any ancillary materials. It is found that the obtained hybrid flexible paper, composed of Co3O4 microsphere array anchored to the underling conductive rGO/CNTs substrate with robust adhesion, is able to deliver high specific capacitance with excellent electrochemical stability even at high current densities, suggesting its promising application as an efficient electrode material for electrochemical capacitors. 相似文献