首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1305篇
  免费   121篇
  国内免费   132篇
电工技术   75篇
综合类   208篇
化学工业   80篇
金属工艺   12篇
机械仪表   56篇
建筑科学   70篇
矿业工程   56篇
能源动力   24篇
轻工业   32篇
水利工程   21篇
石油天然气   139篇
武器工业   14篇
无线电   111篇
一般工业技术   89篇
冶金工业   48篇
原子能技术   3篇
自动化技术   520篇
  2024年   3篇
  2023年   14篇
  2022年   16篇
  2021年   39篇
  2020年   59篇
  2019年   34篇
  2018年   27篇
  2017年   51篇
  2016年   57篇
  2015年   61篇
  2014年   87篇
  2013年   93篇
  2012年   74篇
  2011年   93篇
  2010年   81篇
  2009年   68篇
  2008年   74篇
  2007年   85篇
  2006年   89篇
  2005年   86篇
  2004年   74篇
  2003年   55篇
  2002年   55篇
  2001年   36篇
  2000年   23篇
  1999年   22篇
  1998年   25篇
  1997年   15篇
  1996年   10篇
  1995年   8篇
  1994年   7篇
  1993年   6篇
  1992年   3篇
  1991年   6篇
  1990年   6篇
  1989年   3篇
  1988年   2篇
  1987年   1篇
  1982年   3篇
  1976年   1篇
  1965年   2篇
  1964年   1篇
  1963年   1篇
  1961年   1篇
  1958年   1篇
排序方式: 共有1558条查询结果,搜索用时 15 毫秒
1.
The supervision of a hybrid power plant, including solar panels, a gas microturbine and a storage unit operating under varying solar power profiles is considered. The Economic Supervisory Predictive controller assigns the power references to the controlled subsystems of the hybrid cell using a financial criterion. A prediction of the renewable sources power is embedded into the supervisor. Results deteriorate when the solar power is unsteady, owing to the inaccuracy of the predictions for a long-range horizon of 10 s. The receding horizon is switched between an upper and a lower value according to the amplitude of the solar power trend. Theoretical results show the relevance of horizon switching, according to a tradeoff between performance and prediction accuracy. Experimental results, obtained in a Hardware In the Loop (HIL) framework, show the relevance of the variable horizon approach. Power amplifiers allow us to simulate virtual components, such as a gas microturbine, and to blend their powers with that of real devices (storage unit, real solar panels). In this case, fuel savings, reaching 15%, obtained under unsteady operating conditions lead to a better overall performance of the hybrid cell. The overall savings obtained in the experiments amount to 12%.  相似文献   
2.
Approximate solutions are suggested for receding horizon dual control to guarantee acceptable control performance of a plant with large a priori parameter uncertainties under poor excitation by the output reference and to satisfy the requirement of very fast adaptation using knowledge available on sensor and performance in industrial applications of adaptive control. the aim of the paper is to present several levels of interaction between on-line identification and control performance using parameter bounds. an interesting theorem shows that parameter bounding is a necessary part of the solution of the dual control problem. Starting from the complete separation of identification and control, various approximations are presented at different levels of optimality. Finally, the exact solution of the dual control problem is found for static gain adaptation, which implicitly involves a parameter-bounding identification procedure.  相似文献   
3.
为了减少作战时军用飞机实际起降时刻与计划起降时刻产生的偏差,提出一种基于滚动时域优化原理的动态机场起降调度策略,分析军用飞机起降过程中的时间窗口约束和尾流间隔约束。对进入每个预测窗口内的飞机队列,以加权提前/延误时间和最小作为目标函数,将军用飞机起降调度模型转换为带到达时间的单机加权E/T调度模型。设计一种针对自然数域的离散粒子群算法,并应用该算法进行模型求解。通过仿真实验确定了算法的参数,仿真结果说明了模型和算法的有效性。  相似文献   
4.
This paper studies the robust distributed receding horizon control (DRHC) problem for large-scale continuous-time nonlinear systems subject to communication delays and external disturbances. A dual-mode robust DRHC strategy is designed to deal with the communication delays and the external disturbances simultaneously. The feasibility of the proposed DRHC and the stability of the closed-loop system are analyzed, and the sufficient conditions for ensuring the feasibility and stability are developed, respectively. We show that: (1) the feasibility is affected by the bounds of external disturbances, the sampling period and the bound of communication delays; (2) the stability is related to the bounds of external disturbances, the sampling period, the bound of communication delays and the minimum eigenvalues of the cooperation matrices; (3) the closed-loop system is stabilized into a robust invariant set under the proposed conditions. A simulation study is conducted to verify the theoretical results.  相似文献   
5.
《Journal of Process Control》2014,24(8):1318-1327
This paper presents a methodology for the application of receding horizon optimization techniques to the problem of optimally managing the energy flows in the chlor-alkali process using a hybrid renewable energy system (HRES). The HRES consists of solar and wind energy generation units and fuel cells to supply energy. The HRES is also connected to the grid and allows for buying or selling electricity from and to the grid. Initially, detailed models of each system component are introduced as the basis for the simulation study. Energy management strategies are then developed to realize the objectives of meeting production requirements while minimizing the overall operating and environmental costs. Sensitivity and uncertainty analyses are carried out to elucidate the key parameters that influence the energy management strategies. Finally, production demand response is integrated into the proposed methodology.  相似文献   
6.
In this paper, we aim to solve the finite-horizon optimal control problem for a class of non-linear discrete-time switched systems using adaptive dynamic programming(ADP) algorithm. A new ε-optimal control scheme based on the iterative ADP algorithm is presented which makes the value function converge iteratively to the greatest lower bound of all value function indices within an error according to ε within finite time. Two neural networks are used as parametric structures to implement the iterative ADP algorithm with ε-error bound, which aim at approximating the value function and the control policy, respectively. And then, the optimal control policy is obtained. Finally, a simulation example is included to illustrate the applicability of the proposed method.  相似文献   
7.
Model predictive control is model-based. Therefore, the procedure is inherently not robust to modelling uncertainties. Further, a crucial design parameter is the prediction horizon. Only offline procedures to estimate an upper bound of the optimal value of this parameter are available. These procedures are computationally intensive and model-based. Besides, a single choice of this horizon is perhaps not the best option at all time instants. This is especially true when the control objective is to track desired trajectories. In this paper, we resolve the issue by a time-varying horizon achieved by switching between multiple model-predictive controllers. The stability of the overall system is discussed. In addition, an introduction of multiple models to handle modelling uncertainties makes the overall system robust. The improvement in performance is demonstrated through several examples.  相似文献   
8.
应用条件概率引入条件独立的概念.给出了离散型随机变量条件独立的含义及其性质。  相似文献   
9.
高校毕业生目前就业越来越难的原因主要体现在就业预期偏高,而预期偏高又以薪酬预期高为主。加强职业生涯规划和就业指导,正确引导学生就业,以便解决毕业生薪酬期望过高和用人单位给出的薪酬标准的差距过大的问题。  相似文献   
10.
文中对工程招投标中评价投标方案的方法,利用数学期望的概念,给出了一种确定投标报价的方法。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号