全文获取类型
收费全文 | 161篇 |
免费 | 23篇 |
国内免费 | 14篇 |
专业分类
电工技术 | 32篇 |
综合类 | 15篇 |
化学工业 | 4篇 |
金属工艺 | 5篇 |
机械仪表 | 21篇 |
建筑科学 | 4篇 |
矿业工程 | 3篇 |
能源动力 | 5篇 |
轻工业 | 3篇 |
水利工程 | 3篇 |
石油天然气 | 1篇 |
武器工业 | 2篇 |
无线电 | 30篇 |
一般工业技术 | 5篇 |
冶金工业 | 9篇 |
自动化技术 | 56篇 |
出版年
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 1篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 9篇 |
2012年 | 14篇 |
2011年 | 19篇 |
2010年 | 15篇 |
2009年 | 19篇 |
2008年 | 12篇 |
2007年 | 22篇 |
2006年 | 12篇 |
2005年 | 14篇 |
2004年 | 13篇 |
2003年 | 12篇 |
2002年 | 5篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1990年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有198条查询结果,搜索用时 15 毫秒
191.
192.
Xin Zhang Mengjiao Liu Zhiying Zhang Hui Min Ci Wang Guangkai Hu Tonghui Yang Shimin Luo Bin Yu Tao Huang Meifang Zhu Hao Yu 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(39):2300890
Sliding-freestanding triboelectric nanogenerators (SF-TENGs) are desirable for application in wearable power sources; however, improving their durability is the primary challenge. Meanwhile, few studies focus on enhancing the service life of tribo-materials, especially from an anti-friction perspective during dry operation. Herein, for the first time, a surface-textured film with self-lubricating property is introduced into the SF-TENG as a tribo-material, which is obtained by the self-assembly of hollow SiO2 microspheres (HSMs) close to a polydimethylsiloxane (PDMS) surface under vacuum conditions. The PDMS/HSMs film with micro-bump topography simultaneously reduces the dynamic coefficient of friction from 1.403 to 0.195 and increases the electrical output of SF-TENG by an order of magnitude. Subsequently, a textured film and self-adapting contact synergized bidirectional rotary TENG (TAB-TENG) is developed, and the superiorities of the soft flat rotator with bidirectional reciprocating rotation are systematically investigated. The obtained TAB-TENG exhibits a remarkable output stability and an outstanding mechanical durability over 350 000 cycles. Furthermore, a smart foot system for stepping energy harvesting and wireless walking states monitoring is realized. This study proposes a pioneering strategy for extending the lifetime of SF-TENGs and advances it toward practical wearable applications. 相似文献
193.
194.
195.
196.
周期性扰动的微粒群算法 总被引:1,自引:0,他引:1
微粒群算法中微粒有保持自身状态的特性,如何改变其状态对微粒位置和速度的调整有较大的影响,本文给出一种周期性随机扰动的自适应改变微粒速度的方法.当微粒要进行下一次运动时,总体采用非线性下降的惯性权重选择方法,并且在其中加入周期性随机扰动策略,使算法既能得到较快的收敛速度,又不至于陷入局部极值.将此方法应用于对几个标准函数... 相似文献
197.
《Optimization methods & software》2012,27(4):311-326
We apply reverse accumulation to obtain automatic gradients and error estimates of functions which include in their computation a convergent iteration of the form y= Φ(y,u), where y and u are vectors. We suggest an implementation approach which allows this to be done by a fairly routine extension of existing reverse accumulation code. We show how to re-use the computational graph for the fixed point constructor Φ so as to set explicit stopping criteria for the iterations, based on the gradient accuracy required. Our construction allows the gradient vector to be obtained to the same order of accuracy as the objective function values (which is in general the best we can hope to achieve), and the same order of computational cost (which does not explicitly depend upon the number of independent variables.) The technique can be applied to functions which contain several iterative constructions, either serially or nested 相似文献
198.
针对有源滤波器(APF)在无功补偿过程出现谐振的问题,为提高动态无功补偿中使用的控制算法的动态响应能力,提出一种新的基于有限控制集模型预测控制(FCS-MPC)的动态无功补偿策略.该策略是基于LCL滤波器方程的模型来预测系统状态并优化控制,同时采用多变量结构控制和自适应陷波滤波器来抑制共振,跟踪负载无功功率的波动和突变,提升HAPF的动态响应能力.并通过仿真和实际结果证明了FCS-MPC在HAPF无功控制中的可行性,设备的动态响应明显提高.结果 表明,FCS-MPC在HAPF无功控制中可以快速跟踪负载无功功率变化,有效抑制APF中出现的谐振且系统的动态响应能力明显提升. 相似文献