全文获取类型
收费全文 | 1056篇 |
免费 | 317篇 |
国内免费 | 277篇 |
专业分类
电工技术 | 122篇 |
综合类 | 63篇 |
化学工业 | 29篇 |
金属工艺 | 6篇 |
机械仪表 | 21篇 |
建筑科学 | 21篇 |
矿业工程 | 3篇 |
能源动力 | 6篇 |
轻工业 | 18篇 |
水利工程 | 5篇 |
石油天然气 | 2篇 |
武器工业 | 14篇 |
无线电 | 79篇 |
一般工业技术 | 40篇 |
冶金工业 | 31篇 |
原子能技术 | 2篇 |
自动化技术 | 1188篇 |
出版年
2024年 | 19篇 |
2023年 | 89篇 |
2022年 | 89篇 |
2021年 | 124篇 |
2020年 | 134篇 |
2019年 | 97篇 |
2018年 | 113篇 |
2017年 | 119篇 |
2016年 | 132篇 |
2015年 | 80篇 |
2014年 | 128篇 |
2013年 | 194篇 |
2012年 | 76篇 |
2011年 | 58篇 |
2010年 | 35篇 |
2009年 | 28篇 |
2008年 | 20篇 |
2007年 | 27篇 |
2006年 | 16篇 |
2005年 | 15篇 |
2004年 | 10篇 |
2003年 | 9篇 |
2002年 | 1篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 5篇 |
1998年 | 1篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有1650条查询结果,搜索用时 718 毫秒
41.
Semi‐global output consensus of a group of linear systems in the presence of external disturbances and actuator saturation: An output regulation approach 下载免费PDF全文
This paper studies the problem of semi‐global leader‐following output consensus of a multi‐agent system. The output of each follower agent in the system, described by a same general linear system subject to external disturbances and actuator saturation, is to track the output of the leader, described by a linear system, which also generates disturbances as the exosystem does in the classical output regulation problem. Conditions on the agent dynamics are identified, under which a low‐gain feedback‐based linear state‐control algorithm is constructed for each follower agent such that the output consensus is achieved when the communication topology among the agents is a digraph containing no loop, and the leader is reachable from any follower agent. We also extend the results to the non‐identical disturbance case. In this case, conditions based on both the agent dynamics and the communication topology are identified, under which a low‐gain feedback‐based linear state‐control algorithm is constructed for each follower agent such that the leader‐following output consensus is achieved when the communication topology among the follower agents is a strongly connected and detailed balanced digraph, and the leader is a neighbor of at least one follower. In addition, under some further conditions on the agent dynamics, the control algorithm is adapted so as to achieve semi‐global leader‐following output consensus for a jointly connected undirected graph and the leader reachable from at least one follower. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
42.
This paper studies a distributed coordinated control problem for a class of linear multi‐agent systems subject to two types of attacks. The problem boils down to how to achieve secure consensus tracking for multi‐agent systems with connected and disconnected (paralyzed) directed switching topologies caused by two types of attacks. The attacks on the edges instead of nodes lead to the loss of security performance. Two cases are studied in this paper. First, under only a class of connectivity‐maintained attacks, sufficient conditions are derived to achieve secure consensus tracking in mean‐square. Second, when the multi‐agent systems are further subject to a class of connectivity‐broken attacks, novel sufficient conditions are further obtained to ensure secure consensus tracking with a specified convergence rate by virtue of the idea of average dwell time switching between some stable and unstable subsystems. Three numerical simulations are finally given to illustrate the theoretical analysis. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
43.
This paper studies the partial consensus problem for identical feedforward dynamic systems with input saturations. We construct two consensus protocols using the partial‐state information and full‐state information, respectively. Applying a change of coordinates, feedforward system is transformed into the block diagonal form. Then, by utilizing the bounded real lemma and small gain theorem, we solve the partial consensus problem, and the existence of each protocol is derived. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
44.
Consensus of a class of second‐order nonlinear heterogeneous multi‐agent systems with uncertainty and communication delay 下载免费PDF全文
In this paper, a consensus problem is studied for a group of second‐order nonlinear heterogeneous agents with non‐uniform time delay in communication links and uncertainty in agent dynamics. We design a class of novel decentralized control protocols for the consensus problem whose solvability is converted into stability analysis of an associated closed‐loop system with uncertainty and time delay. Using an explicitly constructed Lyapunov functional, the stability conditions or the solvability conditions of the consensus problem are given in terms of a set of linear matrix inequalities apart from a small number of scalar parameters that appear nonlinearly. Furthermore, the linear matrix inequalities are theoretically verified to be solvable when the communication delay is sufficiently small. The effectiveness of the proposed control protocol is illustrated by numerical examples. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
45.
A stochastic finite frequency consensus protocol for directed networks with Markov jump topologies and external disturbances is proposed in this paper. By introducing the frequency band information into consensus control design, the disagreement dynamics of interconnected networks asymptotically converge to zero with an improved level of disturbance attenuation in the specific frequency band. In addition, the new model transformation approach is presented by exploring certain features of Laplacian matrix in real Jordan form, which leads to more generality of the designed protocol. A numerical example validates the potential of the developed results. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
46.
Consensus in second‐order Markovian jump multi‐agent systems via impulsive control using sampled information with heterogenous delays 下载免费PDF全文
This paper investigates the consensus problem of second‐order Markovian jump multi‐agent systems with delays. Both network‐induced random delay and node‐induced state delay are considered, where the network‐induced random delay, subjected to a Markov chain, exists in the switching signal and the node‐induced state delay, related to switching topologies, is heterogeneous between any two linked agents. In order to reduce communication and control energy, an impulsive protocol is proposed, where each agent only can get delayed relative positions to neighbors and the velocity of itself at impulsive instants. By performing three steps of model transformation and introducing a mapping for two independent Markov chains, the consensus problem of the original continuous‐time system is equivalent to the stability problem of a discrete‐time expand error system with two Markovian jumping parameters and a necessary and sufficient criterion is derived. A numerical example is given to illustrate the effectiveness of the theoretical result.@@@@This work is supported by the National Natural Science Foundation of China under Grants 61374171, 61572210, and 51537003, the Fundamental Research Funds for the Central Universities (2015TS030), and the Program for Changjiang Scholars and Innovative Research Team in University (IRT1245). 相似文献
47.
Time Averaging Algorithms with Stopping Rules for Multi‐Agent Consensus with Noisy Measurements 下载免费PDF全文
A time averaging technique is introduced to consensus algorithms in networked multi‐agent systems under a noisy environment. Each agent communicates with its neighboring agents via a constant gain, while the time averaging states of the agents are considered as the values for agreement. The variation of the time averaging states then is evaluated at a specific number of iterations, where the number is given explicitly in terms of parameters related to the consensus accuracy and its probabilistic guarantee. This result establishes a rigorous stopping rule for the multi‐agent consensus with noisy measurements. Several results on this type of stopping rules are provided for undirected, directed, and time‐varying communication graphs. These theoretical results are illustrated through numerical examples. 相似文献
48.
目的 针对基于SURF特征点的图像配准算法对颜色单一的彩色图像提取的特征点较少及配准时间复杂度高等问题,提出一种基于融合特征的快速SURF(speed up robust features)配准算法.方法 该算法首先提取图像的颜色不变量边缘特征和CS-LBP(central symmetry-local binary patterns)纹理特征形成融合特征灰度图,并利用颜色直方图的方差自适应调节融合特征间的权重.其次,在融合特征灰度图上提取SURF(speed up robust features)特征点及描述子.再次,用最近邻匹配法形成粗匹配对,结合改进的快速RANSAC(random sample consensus)算法得到精匹配对.最后,使用最小二乘法求出映射关系用于配准图像.结果 本文算法能够在融合特征上提取更稳定的SURF特征点,用该特征点进行配准能提高配准5%精度,且减少时间复杂度15%,实现了对普通场景下图像的快速配准.结论 本文算法能提取稳定数量的特征点,提高了精确度与鲁棒性,并通过改进的RANSAC算法提高了执行效率,降低了迭代次数. 相似文献
49.
A disturbance observer based practical coordinated tracking controller for uncertain heterogeneous multi‐agent systems 下载免费PDF全文
This paper presents a coordinated tracking controller for multi‐agent systems. We assume that agents are uncertain, nonidentical, and affected by external disturbances. The information available to the tracking controller is a weighted sum of relative measurements. A coordinated tracking controller based on the disturbance observer, which is known as a robust output feedback controller, is designed so that the disturbances acting on agents are attenuated and at the same time the weighted sum of relative measurements approximately satisfies a differential equation defined by the leader's dynamics, which results in practical coordinated tracking. Systematic design procedures of the controller as well as numerical simulations are provided. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
50.
This paper proposes a novel pose (position and orientation) consensus controller for networks of heterogeneous robots modeled in the operational space. The proposed controller is a distributed proportional plus damping scheme that, with a slight modification, solves both the leader–follower and leaderless consensus problems. A singularity‐free representation, unit quaternion, is used to describe the robots orientation, and the network is represented by an undirected and connected interconnection graph. Furthermore, it is shown that the controller is robust to interconnection variable time delays. Experiments with a network of two 6‐degrees‐of‐freedom robots are presented to illustrate the performance of the proposed scheme. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献