全文获取类型
收费全文 | 349篇 |
免费 | 19篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 3篇 |
综合类 | 1篇 |
化学工业 | 125篇 |
金属工艺 | 2篇 |
机械仪表 | 6篇 |
建筑科学 | 13篇 |
能源动力 | 23篇 |
轻工业 | 35篇 |
水利工程 | 7篇 |
石油天然气 | 2篇 |
无线电 | 20篇 |
一般工业技术 | 44篇 |
冶金工业 | 11篇 |
原子能技术 | 1篇 |
自动化技术 | 76篇 |
出版年
2024年 | 2篇 |
2023年 | 4篇 |
2022年 | 17篇 |
2021年 | 22篇 |
2020年 | 23篇 |
2019年 | 28篇 |
2018年 | 20篇 |
2017年 | 22篇 |
2016年 | 20篇 |
2015年 | 15篇 |
2014年 | 14篇 |
2013年 | 27篇 |
2012年 | 20篇 |
2011年 | 18篇 |
2010年 | 13篇 |
2009年 | 8篇 |
2008年 | 8篇 |
2007年 | 11篇 |
2006年 | 9篇 |
2005年 | 7篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1997年 | 1篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有369条查询结果,搜索用时 15 毫秒
1.
In this paper the optimal H∞, general distance problem, for continuous-time systems, with a prescribed degree on the solution is studied. The approach is based on designing the Hankel singular values using an imbedding idea. The problem is first imbedded into another problem with desirable characteristics on the Hankel singular values, then the solution to the original problem is retracted via a compression. The result is applicable to both the one-block and the four-block problems. A special case is given for illustration. 相似文献
2.
A new construction for the rotor windings of balanced wound-rotor induction motors employed in the slip energy recovery drives is proposed, in this paper, to reduce the time harmonics which are commonly generated in the machine. The proposed machine has a double-circuit in the rotor. One circuit is star connected while the other is delta connected. Each of these two circuits is connected to a diode-bridge rectifier to achieve a twelve-pulse operation characteristics. The main objective of this paper is to develop a new model which is capable of simulating the proposed machine, neglecting nonlinearities due to magnetic saturation, and its associated converters. Such a model is further complicated due to the presence of the two rotor circuits and their mutual interaction 相似文献
3.
Zakaria Chajar Michel Primet Hélène Praliaud Michèle Chevrier Catherine Gauthier Frédéric Mathis 《Catalysis Letters》1994,28(1):33-40
The role of nitrogen dioxide in the selective reduction of NO by propane over a Cu-MFI zeolite is investigated. NO2 and NO reductions were carried out under similar conditions of reaction. In the presence of oxygen, the reduction of NO by C3H8 does not differ significantly from that of NO2. In the absence of oxygen, the reduction of NO2 by propane occurs with a partial decomposition of the nitric dioxide molecule. Such a decomposition leads to the formation of oxygen, which is responsible for the increase in catalytic activity by comparison with the same reaction performed with NO. NO2 formed and released in the gas phase during the reduction of NO by propane in the presence of oxygen does not play a predominant role in the catalytic process. 相似文献
4.
5.
Privacy issues are frequently discussed amongst researchers, practitioners and patients in healthcare. However, psychiatric patients’ privacy issues get less attention in information system development (ISD), whereby they are one of the most important stakeholders. This paper applies Carew and Stapleton’s ISD privacy framework to psychiatric monitoring systems to understand the issues that are related to monitoring psychiatric patients’ behaviour. By understanding the privacy issues amongst patients, the research will be able to provide guidance to system developers to produce a privacy-sensitive system that can contribute to the system engineering for international stability. We will elaborate each factor in the framework (physical, social, psychological and informational) and then explain the relationship to the privacy of psychiatric patient. 相似文献
6.
Amar Si Ammour Said Djennoune Woihida Aggoune Maamar Bettayeb 《Asian journal of control》2015,17(5):1946-1954
This paper describes a variable structure control for fractional‐order systems with delay in both the input and state variables. The proposed method includes a fractional‐order state predictor to eliminate the input delay. The resulting state‐delay system is controlled through a sliding mode approach where the controller uses a sliding surface defined by fractional order integral. Then, the proposed control law ensures that the state trajectories reach the sliding surface in finite time. Based on recent results of Lyapunov stability theory for fractional‐order systems, the stability of the closed loop is studied. Finally, an illustrative example is given to show the interest of the proposed approach. 相似文献
7.
In recent years, we have witnessed a growing interest in the synchronous collaboration based class of applications. Several
techniques for collaborative virtual environments (CVE), haptic, audio and visual environments (C-HAVE) have been designed.
However, several challenging issues remain to be resolved before CVE and C-HAVE become a common place. In this paper, we focus
on applications that are based on closely coupled and highly synchronized haptic tasks that require a high-level of coordination
among the participants. Four main protocols have been designed to resolve the synchronization issues in such environments:
the synchronous collaboration transport protocol, the selective reliable transmission protocol, the reliable multicast transport
protocol and the scalable reliable multicast. While these four protocols have shown good performance for CVE and C-HAVE class
of applications, none of these protocols has been able to meet all of the basic CVE requirements, i.e., scalability, reliability,
synchronization, and minimum delay. In this paper, we present a hybrid protocol that is able to satisfy all of the CVE and
C-HAVE requirements and discuss its implementation and results in two tele-surgery applications.
This work is partially supported by Grants from Canada Research Chair Program, NSERC, OIT/Ontario Distinguished Researcher
Award, Early Research Award and ORNEC Research Grant. 相似文献
8.
Mounir Bousbia-Salah Maamar Bettayeb Allal Larbi 《Journal of Intelligent and Robotic Systems》2011,64(3-4):387-400
This paper presents a navigation aid for the blind based on a microcontroller with synthetic speech output. The system consists of two vibrators, two ultrasonic sensors mounted on the user??s shoulders and another one integrated into the cane. It is able to give information to the blind about urban walking routes and to provide real-time information on the distance of over-hanging obstacles within 6 m along the travel path ahead of the user. The suggested system can then sense the surrounding environment via sonar sensors and sending vibro-tactile feedback to the user of the position of the closest obstacles in range. For the ultrasonic cane, it is used to detect any obstacle on the ground. Experimental results show the effectiveness of the proposed system for blind navigation. 相似文献
9.
Ubaid M. Al-Saggaf Ibrahim M. Mehedi Rachid Mansouri Maamar Bettayeb 《International Journal of Control, Automation and Systems》2017,15(6):2561-2569
In this paper, a fractional order control law is proposed and implemented for the evaluation of trajectory tracking performance of a rotary flexible-joint system. A state feedback based fractional integral control scheme is used in this proposed method. In this scheme, state feedback is responsible for stabilizing the system. The compensator, in series with the fractional integrator leads to obtain a similar closed-loop transient response like Bode’s ideal transfer function. The effectiveness of the proposed controller in tracking and being robust against parameter uncertainties is demonstrated through simulation. In addition, to show the usefulness of the proposed control scheme, the fractional controller is compared to an integer state feedback control by simulation and through experimentation on the Quanser’s rotary flexible-joint system. 相似文献
10.
S. Sattanathan N.C. Narendra Z. Maamar 《Electronic Notes in Theoretical Computer Science》2006,146(1):43
This paper presents an ontology-based approach for the specification (using as a definition language) and reconciliation (using as a mediation tool) of contexts of Web services. Web services are independent components that can be triggered and composed for the satisfaction of user needs (e.g., hotel booking). Because Web services originate from different providers, their composition faces the obstacle of the context heterogeneity featuring these Web services. An unawareness of this context heterogeneity during Web services composition and execution results in a lack of the quality and relevancy of information that permits tracking the composition, monitoring the execution, and handling exceptions. 相似文献