全文获取类型
收费全文 | 141篇 |
免费 | 6篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 36篇 |
金属工艺 | 1篇 |
机械仪表 | 1篇 |
建筑科学 | 2篇 |
能源动力 | 4篇 |
轻工业 | 5篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 20篇 |
一般工业技术 | 25篇 |
冶金工业 | 5篇 |
原子能技术 | 3篇 |
自动化技术 | 40篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 10篇 |
2021年 | 10篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 8篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 8篇 |
2014年 | 9篇 |
2013年 | 14篇 |
2012年 | 8篇 |
2011年 | 12篇 |
2010年 | 6篇 |
2009年 | 4篇 |
2008年 | 7篇 |
2007年 | 5篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2004年 | 6篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1998年 | 2篇 |
1979年 | 3篇 |
1975年 | 2篇 |
1966年 | 1篇 |
排序方式: 共有147条查询结果,搜索用时 267 毫秒
11.
Tarik Uzunovic Asif Sabanovic 《International Journal of Control, Automation and Systems》2018,16(5):2043-2054
When a complex task has to be performed by multiple systems, it imposes functional dependencies between the states and/or outputs of the systems. These functional dependencies create a system of’ virtually’ interconnected subsystems, even though they may be physically separated. The component subsystems within the overall system we call ‘functionally related systems’. This paper deals with motion control design for functionally related systems. The design is based on identifying functions. The control design is then performed by projecting the system dynamics into the function space. The main goal is to obtain unit control distribution matrix in the function space and enforce a desired dynamics for each of the identified functions. 相似文献
12.
Understanding large, complex networks is important for many critical tasks, including decision making, process optimization, and threat detection. Existing network analysis tools often lack intuitive interfaces to support the exploration of large scale data. We present a visual recommendation system to help guide users during navigation of network data. Collaborative filtering, similarity metrics, and relative importance are used to generate recommendations of potentially significant nodes for users to explore. In addition, graph layout and node visibility are adjusted in real‐time to accommodate recommendation display and to reduce visual clutter. Case studies are presented to show how our design can improve network exploration. 相似文献
13.
A PIM–SM-built multicast tree must be restructured when the underlying unicast routing tables change. We describe the PIM–SM recovery mechanisms and evaluate the recovery performance, showing its dependence on a range of network and session parameters. Our results show that a substantial packet loss can be caused by nonreductive, benign events in the network, such as an addition of a new link. We propose and evaluate an improvement to the standard PIM–SM recovery procedure aimed to reduce the packet loss caused by the benign events. Our evaluation shows that the data loss caused by these events can be significantly decreased regardless of the topology and session parameters. 相似文献
14.
José María Arroyo-Caro Tarik Chileh Diego López Alonso Federico García-Maroto 《Lipids》2013,48(7):663-674
Acyl-CoA:lysophosphatidylcholine acyltransferase (LPCAT, EC 2.3.1.23) catalyzes acylation of lysophosphatidylcholine (lysoPtdCho) to produce phosphatidylcholine (PtdCho), the main phospholipid in cellular membranes. This reaction is a key component of the acyl-editing process, involving recycling of the fatty acids (FA) mainly at the sn-2 position of PtdCho. Growing evidences indicate that the LPCAT reaction controls the direct entry of newly synthesized FA into PtdCho and, at least in some plant species, it has an important impact on the synthesis and composition of triacylglycerols. Here we describe the molecular characterization of the single LPCAT gene found in the genome of Ricinus communis (RcLPCAT) that is homologous to LPCAT genes of the MBOAT family previously described in Arabidopsis and Brassica. RcLPCAT is ubiquitously expressed in all organs of the castor plant. Biochemical properties have been studied by heterologous expression of RcLPCAT in the ale1 yeast mutant, defective in lysophospholipid acyltransferase activity. RcLPCAT preferentially acylates lysoPtdCho against other lysophospholipids (lysoPL) and does not discriminates the acyl chain in the acceptor, displaying a strong activity with alkyl lysoPL. Regarding the acyl-CoA donor, RcLPCAT uses monounsaturated fatty acid thioesters, such as oleoyl-CoA (18:1-CoA), as preferred donors, while it has a low activity with saturated fatty acids and shows a poor utilization of ricinoleoyl-CoA (18:1-OH-CoA). These characteristics are discussed in terms of a possible role of RcLPCAT in regulating the entry of FA into PtdCho and the exclusion from the membranes of the hydroxylated FA. 相似文献
15.
A distributed activity scheduling algorithm for wireless sensor networks with partial coverage 总被引:1,自引:0,他引:1
One of the most important design objectives in wireless sensor networks (WSN) is minimizing the energy consumption since these
networks are expected to operate in harsh conditions where the recharging of batteries is impractical, if not impossible.
The sleep scheduling mechanism allows sensors to sleep intermittently in order to reduce energy consumption and extend network
lifetime. In applications where 100% coverage of the network field is not crucial, allowing the coverage to drop below full
coverage while keeping above a predetermined threshold, i.e., partial coverage, can further increase the network lifetime.
In this paper, we develop the distributed adaptive sleep scheduling algorithm (DASSA) for WSNs with partial coverage. DASSA
does not require location information of sensors while maintaining connectivity and satisfying a user defined coverage target.
In DASSA, nodes use the residual energy levels and feedback from the sink for scheduling the activity of their neighbors.
This feedback mechanism reduces the randomness in scheduling that would otherwise occur due to the absence of location information.
The performance of DASSA is compared with an integer linear programming (ILP) based centralized sleep scheduling algorithm
(CSSA), which is devised to find the maximum number of rounds the network can survive assuming that the location information
of all sensors is available. DASSA is also compared with the decentralized DGT algorithm. DASSA attains network lifetimes
up to 92% of the centralized solution and it achieves significantly longer lifetimes compared with the DGT algorithm. 相似文献
16.
Oncu Akyildiz Ersin Emre Oren Tarik Omer Ogurtani 《Journal of Materials Science》2011,46(18):6054-6064
A systematic study based on the self-consistent dynamical simulations is presented for the grain boundary thermal grooving
problem by strictly following the irreversible thermodynamic theory of surfaces and interfaces with singularities [T. O. Ogurtani,
J. Chem. Phys. 124, 144706 (2006)]. This approach furnishes us to have auto-control on the otherwise free-motion of the grain
boundary triple junction without presuming any equilibrium dihedral (wetting) angles at the edges. The effects of physicochemical
properties and the anisotropic surface diffusivity on the transient grooving behavior, which takes place at the early stage
of the scenario, were considered. We analyzed the experimental thermal grooving data reported for tungsten in the literature,
and compared them with the carried simulation results. This investigation showed that the observed changes in the dihedral
angles are strictly connected to the transient behavior of the simulated global system, and manifest themselves at the early
stage of the thermal grooving phenomenon. 相似文献
17.
18.
Tarik Taleb Abbas Jamalipour Nei Kato Yoshiaki Nemoto 《International Journal of Satellite Communications and Networking》2006,24(3):215-227
To meet an ever‐growing demand for wideband multimedia services and electronic connectivity across the world, development of ubiquitous broadband multimedia systems is gaining a tremendous interest at both commercial and academic levels. Satellite networks will play an indispensable role in the deployment of such systems. A significant number of satellite communication constellations have been thus proposed using Geostationary (GEO), Medium Earth Orbit (MEO), or Low Earth Orbit (LEO) satellites. These constellations, however, either require a potential number of satellites or are unable to provide data transmission with high elevation angles. This paper proposes a new satellite constellation composed of Quasi‐GeoStationary Orbit (Quasi‐GSO) satellites. The main advantage of the constellation is in its ability to provide global coverage with a significantly small number of satellites while, at the same time, maintaining high elevation angles. Based on a combination of this Quasi‐GSO satellites constellation and terrestrial networks, the paper proposes also an architecture for building a global, large‐scale, and efficient Video‐on‐Demand (VoD) system. The entire architecture is referred to as a ‘Theatre in the Sky’. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
19.
Tarik A. Almohamad M. F. M. Salleh M. N. Mahmud 《Wireless Personal Communications》2014,77(1):255-267
In wireless cooperative communication scheme, transmit diversity is achieved by coupling the distributed users. In this paper, a new partner selection algorithm is proposed. The selection scheme utilizes the basic work done by Almawgani on RS coded cooperation for wireless network. Users are classified into weak and strong ones based on the signal-to-Noise Ratio (SNR) uplink matrix. Users with good uplink channel SNR (strong users) are coupled with those experiencing weak uplink channel conditions (weak users). The proposed algorithm offers an improvement to the outage probability, \(P_{out}\) and power efficiency as compared to the established work. The algorithm shows a significant improvement of \(P_{out}\) at lower values of uplink SNR. 相似文献
20.