全文获取类型
收费全文 | 8794篇 |
免费 | 1544篇 |
国内免费 | 711篇 |
专业分类
电工技术 | 1213篇 |
综合类 | 798篇 |
化学工业 | 1017篇 |
金属工艺 | 208篇 |
机械仪表 | 503篇 |
建筑科学 | 378篇 |
矿业工程 | 274篇 |
能源动力 | 721篇 |
轻工业 | 161篇 |
水利工程 | 595篇 |
石油天然气 | 214篇 |
武器工业 | 71篇 |
无线电 | 1379篇 |
一般工业技术 | 1089篇 |
冶金工业 | 253篇 |
原子能技术 | 145篇 |
自动化技术 | 2030篇 |
出版年
2024年 | 53篇 |
2023年 | 170篇 |
2022年 | 307篇 |
2021年 | 293篇 |
2020年 | 346篇 |
2019年 | 340篇 |
2018年 | 295篇 |
2017年 | 460篇 |
2016年 | 485篇 |
2015年 | 430篇 |
2014年 | 574篇 |
2013年 | 549篇 |
2012年 | 545篇 |
2011年 | 574篇 |
2010年 | 472篇 |
2009年 | 492篇 |
2008年 | 454篇 |
2007年 | 494篇 |
2006年 | 432篇 |
2005年 | 352篇 |
2004年 | 311篇 |
2003年 | 475篇 |
2002年 | 514篇 |
2001年 | 498篇 |
2000年 | 341篇 |
1999年 | 267篇 |
1998年 | 144篇 |
1997年 | 130篇 |
1996年 | 71篇 |
1995年 | 25篇 |
1994年 | 37篇 |
1993年 | 17篇 |
1992年 | 19篇 |
1991年 | 21篇 |
1990年 | 11篇 |
1989年 | 13篇 |
1988年 | 19篇 |
1987年 | 6篇 |
1986年 | 6篇 |
1985年 | 3篇 |
1983年 | 1篇 |
1974年 | 1篇 |
1959年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
针对融合识别领域中不同框架下多源异类传感器的不确定证据信息无法有效融合的问题, 提出一种基于条件证据网络的多源异类知识融合识别方法. 该方法将战场协同作战中不同框架下多源异类传感器的领域知识统一在证据网络的结构下, 形成多源异类知识融合识别模型, 对多源异类传感器的不确定性证据信息进行基于条件证据网络的融合推理, 得到识别结果. 仿真实例验证了所提出方法的优越性.
相似文献94.
研究在线多机器人地图覆盖。在单机器人生成树STC算法基础上做出改进,融入了市场拍卖算法,使机器人团体扩散地生成树,并沿各自生成树完成地图覆盖。通过两种不同环境地图覆盖仿真,结果验证改进后的IMPSTC算法,能够使机器人团队在更少的时间和重复覆盖区域情况下完成在线覆盖地图任务。 相似文献
95.
多参数融合的飞行品质评估模型的建立 总被引:2,自引:0,他引:2
目前航空管理机构与航空公司进行飞行品质评估主要是依据经验与简单飞行参数统计数字,这样做难以得出科学、客观的评估结果。基于提升全行业安全保障能力和运行品质的需求,研究了利用计算机技术对飞行品质进行综合评估的方法。选取了理想值逼近法作为飞行品质综合评估的手段,结合波动通道模型作为飞行品质评估的理论基础,基于提出的飞行品质评估模型对飞行品质评估系统进行了设计。对真实的飞行参数数据建立综合评估模型,同时考察多次航班的多个飞行参数,给出综合的飞行品质评估结论,为飞行评估、训练提供理论基础和科学的评判方法。 相似文献
96.
Two‐way multi‐view 2‐D/3‐D display combining LC lens and HVxDP panel using novel pixel arrangement
下载免费PDF全文
![点击此处可从《Journal of the Society for Information Display》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Jin Matsushima Yukie Ibata Kazunori Masumura Takuya Asai Tetsushi Sato Koji Shigemura 《Journal of the Society for Information Display》2016,24(4):252-261
We have developed a two‐way multi‐view 2‐D/3‐D display combining a liquid crystal lens and horizontally and vertically x times‐density pixels (HVxDP) arrangement. The two‐way multi‐view display features the same display resolution in 2‐D and 3‐D modes and a quite small color moiré for landscape and portrait, respectively, when using the HVxDP arrangement. In this paper, we realized suitable 3‐D properties for achieving a good balance between 3‐D moiré and 3‐D crosstalk for landscape and portrait by a two‐way liquid crystal lens with two kinds of focal lengths for the edge part and the center part of the lens. 相似文献
97.
Semi‐global and global containment control of multi‐agent systems with second‐order dynamics and input saturation
下载免费PDF全文
![点击此处可从《国际强度与非线性控制杂志<br>》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This paper considers both semi‐global and global containment control for a second‐order multi‐agent system that is composed by a network of identical harmonic oscillators or double integrators with multiple leaders and input saturation. A distributed low gain feedback algorithm is proposed to solve the semi‐global containment control problem for the network whose topology is directed and initial condition is taken from any a priori given bounded set. In particular, by using a parametric Lyapunov equation approach, M‐matrix properties and algebraic graph theory, an upper bound of the low gain parameter is estimated such that the low gain feedback matrix can be analytically determined without involving numerical computation. Furthermore, under the assumption that the induced subgraph formed by the followers is strongly connected and detail balanced, two linear feedback protocols are designed for coupled harmonic oscillators and coupled double integrators, respectively, to asymptotically achieve the global containment control of the network with any initial condition. Finally, numerical examples are given to illustrate the effectiveness of the theoretical results. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
98.
99.
High‐precision formation control of nonlinear multi‐agent systems with switching topologies: A learning approach
下载免费PDF全文
![点击此处可从《国际强度与非线性控制杂志<br>》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Arbitrary high precision is considered one of the most desirable control objectives in the relative formation for many networked industrial applications, such as flying spacecrafts and mobile robots. The main purpose of this paper is to present design guidelines of applying the iterative schemes to develop distributed formation algorithms in order to achieve this control objective. If certain conditions are met, then the control input signals can be learned by the developed algorithms to accomplish the desired formations with arbitrary high precision. The systems under consideration are a class of multi‐agent systems under directed networks with switching topologies. The agents have discrete‐time affine nonlinear dynamics, but their state functions do not need to be identical. It is shown that the learning processes resulting from the relative output formation of multi‐agent systems can converge exponentially fast with the increase of the iteration number. In particular, this work induces a distributed algorithm that can simultaneously achieve the desired relative output formation between agents and regulate the movement of multi‐agent formations as desired along the time axis. The illustrative numerical simulations are finally performed to demonstrate the effectiveness and performance of the proposed distributed formation algorithms. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
100.
The control performance of wireless networked control systems (WNCS) has been shown to heavily depend on the packet delivery quality of both the sensor‐to‐controller and controller‐to‐actuator communications. Such quality relies on the relative distance between the wireless transmitter and receiver, which naturally raises the challenging problem of controller placement in WNCS for optimal control performance. In this paper, we investigate the optimal controller location (OCL) problem in WNCS based on linear‐quadratic‐Gaussian control strategy. For the one‐hop network case where the controller can only be placed at either the sensor side or the actuator side, we derive a simple yet effective criterion to determine the OCL. For the more general multi‐hop case where the controller can be located at either one of the sensors, relays, or actuators, we obtain the necessary and sufficient condition under which the closed‐loop system is guaranteed to be stable. On the basis of these results, we further transform the OCL problem into an optimization problem that can be solved efficiently. Numerical results are provided to verify our analysis. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献