全文获取类型
收费全文 | 38425篇 |
免费 | 4658篇 |
国内免费 | 3677篇 |
专业分类
电工技术 | 4448篇 |
技术理论 | 1篇 |
综合类 | 6517篇 |
化学工业 | 798篇 |
金属工艺 | 761篇 |
机械仪表 | 3242篇 |
建筑科学 | 1634篇 |
矿业工程 | 1371篇 |
能源动力 | 811篇 |
轻工业 | 890篇 |
水利工程 | 1182篇 |
石油天然气 | 820篇 |
武器工业 | 591篇 |
无线电 | 3034篇 |
一般工业技术 | 1768篇 |
冶金工业 | 620篇 |
原子能技术 | 142篇 |
自动化技术 | 18130篇 |
出版年
2024年 | 58篇 |
2023年 | 317篇 |
2022年 | 604篇 |
2021年 | 697篇 |
2020年 | 893篇 |
2019年 | 777篇 |
2018年 | 778篇 |
2017年 | 913篇 |
2016年 | 1134篇 |
2015年 | 1315篇 |
2014年 | 2142篇 |
2013年 | 2216篇 |
2012年 | 2764篇 |
2011年 | 3122篇 |
2010年 | 2405篇 |
2009年 | 2526篇 |
2008年 | 2828篇 |
2007年 | 3377篇 |
2006年 | 3006篇 |
2005年 | 2716篇 |
2004年 | 2274篇 |
2003年 | 2051篇 |
2002年 | 1621篇 |
2001年 | 1395篇 |
2000年 | 1144篇 |
1999年 | 841篇 |
1998年 | 639篇 |
1997年 | 448篇 |
1996年 | 376篇 |
1995年 | 327篇 |
1994年 | 259篇 |
1993年 | 189篇 |
1992年 | 154篇 |
1991年 | 105篇 |
1990年 | 69篇 |
1989年 | 88篇 |
1988年 | 43篇 |
1987年 | 28篇 |
1986年 | 10篇 |
1985年 | 22篇 |
1984年 | 21篇 |
1983年 | 18篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1980年 | 9篇 |
1979年 | 8篇 |
1978年 | 2篇 |
1977年 | 6篇 |
1976年 | 2篇 |
1951年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
杨霁琳张贤勇唐孝 《数据采集与处理》2016,31(6):1156-1163
在模糊信息系统中,通过有序加权平均(Ordered weighted averaging,OWA)算子计算对象相似度,可以建立λ截集的相容关系。当λ的值确定后,OWA算子中量词参数(α,β)的选取直接关系到不可区分关系的建立以及信息粒的粗细。因此合理选取参数(α,β)是值得进一步研究的问题。本文采用粗糙集三支决策理论,研究模糊信息系统
OWA算子参数选择的相关内容。基于参数的激进、中庸和消极语义,确定OWA算子(α,β)的3种常用取值;进而研究相似度、相容类、双向近似和三支区域在3种参数选择下的性质关系。最后利用实例验证分析了模糊量词参数语义解释的合理性。本文采用三支决策创新视角,得到模糊信息系统OWA算子的深入性质,为相关模糊量词参数提供语义解释与选择依据。 相似文献
42.
43.
Employing an effective learning process is a critical topic in designing a fuzzy neural network, especially when expert knowledge is not available. This paper presents a genetic algorithm (GA) based learning approach for a specific type of fuzzy neural network. The proposed learning approach consists of three stages. In the first stage the membership functions of both input and output variables are initialized by determining their centers and widths using a self-organizing algorithm. The second stage employs the proposed GA based learning algorithm to identify the fuzzy rules while the final stage tunes the derived structure and parameters using a back-propagation learning algorithm. The capabilities of the proposed GA-based learning approach are evaluated using a well-examined benchmark example and its effectiveness is analyzed by means of a comparative study with other approaches. The usefulness of the proposed GA-based learning approach is also illustrated in a practical case study where it is used to predict the performance of road traffic control actions. Results from the benchmarking exercise and case study effectively demonstrate the ability of the proposed three stages learning approach to identify relevant fuzzy rules from a training data set with a higher prediction accuracy than alternative approaches. 相似文献
44.
This article is concerned with event-triggered fuzzy control design for a class of discrete-time nonlinear networked control systems (NCSs) with time-varying communication delays. Firstly, a more general mixed event-triggering scheme (ETS) is proposed. Secondly, considering the effects of the ETS and communication delays, based on the T-S fuzzy model scheme and time delay system approach, the original nonlinear NCSs is reformulated as a new event-triggered networked T-S fuzzy systems with interval time-varying delays. Sufficient conditions for uniform ultimately bound (UUB) stability are established in terms of linear matrix inequalities (LMIs). In particular, the quantitative relation between the boundness of the stability region and the triggering parameters are studied in detail. Thirdly, a relative ETS is also provided, which can be seen as a special case of the above proposed mixed ETS. As a difference from the preceding results, sufficient conditions on the existence of desired fuzzy controller are derived to ensure the asymptotic stability of the closed-loop system with reduced communication frequency between sensors and controllers. Moreover, a co-design algorithm for simultaneously determining the gain matrices of the fuzzy controller and the triggering parameters is developed. Finally, two illustrative examples are presented to demonstrate the advantage of the proposed ETS and the effectiveness of the controller design method. 相似文献
45.
软管脉冲实验台一般使用电液伺服系统,占用空间小,原理结构简单,信号跟踪能力强,在工业控制领域应用广泛。然而,由于液压反应速度慢、干扰因素多,因而控制精度低,系统不稳定;而传统的液压脉冲实验台单纯PID的控制方式原理简单,但参数调节困难。本文针对控制系统的特殊要求,提出了一种模糊PID控制方法,既保留了原控制系统的优点,又改善了原系统存在的参数时变、不稳定、滞后等缺点,提高了系统的适应能力和精度。经反复调试和试验,结果表明,该系统有效地解决了系统不稳定、滞后严重和参数时变等问题。 相似文献
46.
Private information retrieval(PIR) is an important privacy protection issue of secure multi-party computation, but the PIR protocols based on classical cryptography are vulnerable because of new technologies,such as quantum computing and cloud computing. The quantum private queries(QPQ) protocols available, however, has a high complexity and is inefficient in the face of large database. This paper, based on the QKD technology which is mature now, proposes a novel QPQ protocol utilizing the key dilution and auxiliary parameter. Only N quits are required to be sent in the quantum channel to generate the raw key, then the straight k bits in the raw key are added bitwise to dilute the raw key, and a final key is consequently obtained to encrypt the database. By flexible adjusting of auxiliary parameters θ and k, privacy is secured and the query success ratio is improved. Feasibility and performance analyses indicate that the protocol has a high success ratio in first-trial query and is easy to implement, and that the communication complexity of O(N) is achieved. 相似文献
47.
48.
通过建立项目管理数据平台,让石油化工项目建设管理经验得到更好的传承和利用,数据平台可以实现管理经验数据化、建设数据共享化、数据结构模板化、数据编码标准化、收集数据流程化、数据操作平台化、数据计算集成化、数据更新动态化功能目标。结合石油化工项目建设特点,归纳了5类31种管理数据,介绍了每种数据的内容和用途,并对各种数据的字段设计、平台开发技术选择提出了建议,并对数据平台的未来价值进行了展望。 相似文献
49.
50.
Mengru Liu Weihai Zhang Limin Ma 《International Journal of Adaptive Control and Signal Processing》2022,36(1):69-87
The article investigates the finite-time adaptive fuzzy control for a class of nonlinear systems with output constraint and input dead-zone. First, by skillfully combining the barrier Lyapunov function, backstepping design method, and finite-time control theory, a novel adaptive state-feedback tracking controller is constructed, and the output constraint of the nonlinear system is not violated. Second, the fuzzy logic system is used to approximate unknown function in the nonlinear system. Third, the finite-time command filter is introduced to avoid the problem of “complexity explosion” caused by repeated differentiations of the virtual control signal in conventional backstepping control schemes. Meanwhile, a new saturation function is added in the compensating signal for filter error to improve control accuracy. Finally, based on Lyapunov stability analysis, all the signals of the closed-loop are proved to be semi-globally uniformly ultimately bounded, and the tracking error converges to a small neighborhood region of the origin in a finite time. A simulation example is presented to demonstrate the effectiveness for the proposed control scheme. 相似文献