全文获取类型
收费全文 | 522篇 |
免费 | 32篇 |
专业分类
电工技术 | 29篇 |
化学工业 | 170篇 |
金属工艺 | 4篇 |
机械仪表 | 21篇 |
建筑科学 | 25篇 |
能源动力 | 29篇 |
轻工业 | 27篇 |
水利工程 | 3篇 |
无线电 | 31篇 |
一般工业技术 | 96篇 |
冶金工业 | 31篇 |
原子能技术 | 2篇 |
自动化技术 | 86篇 |
出版年
2024年 | 1篇 |
2023年 | 11篇 |
2022年 | 31篇 |
2021年 | 29篇 |
2020年 | 11篇 |
2019年 | 12篇 |
2018年 | 11篇 |
2017年 | 15篇 |
2016年 | 21篇 |
2015年 | 23篇 |
2014年 | 27篇 |
2013年 | 56篇 |
2012年 | 39篇 |
2011年 | 33篇 |
2010年 | 19篇 |
2009年 | 36篇 |
2008年 | 21篇 |
2007年 | 22篇 |
2006年 | 20篇 |
2005年 | 9篇 |
2004年 | 10篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 9篇 |
2000年 | 7篇 |
1999年 | 4篇 |
1998年 | 9篇 |
1997年 | 12篇 |
1996年 | 8篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1972年 | 2篇 |
排序方式: 共有554条查询结果,搜索用时 15 毫秒
21.
A highly efficient receiver for satellite‐based automatic identification system signal detection 下载免费PDF全文
Giulio Colavolpe Tommaso Foggi Alessandro Ugolini Juan Lizarraga Stefano Cioni Alberto Ginesi 《International Journal of Satellite Communications and Networking》2016,34(1):57-73
An innovative receiver architecture for the satellite‐based automatic identification system has been recently proposed. In this paper, we describe a few modifications that can be introduced on the algorithms for synchronization and detection, which provide an impressive performance improvement. The receiver architecture has been designed for an on‐board implementation, and a prototype has been implemented by the University of Parma and CGS S.p.A. Compagnia Generale per lo Spazio under the European Space Agency project FENICE (Flexible innovative AIS receiver prototype). A few modifications are also here described that could allow a further performance improvement in case of processing moved to ground‐based stations, based on a priori information there available. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
22.
23.
Giulio Vialetto Marco Noro Masoud Rokni 《International Journal of Hydrogen Energy》2017,42(15):10285-10297
In recent years, Denmark boosted investments in renewable energy and electrification of transportation. The Danish Agenda proposed that all primary energy consumption will be covered by renewable sources such as wind, biomass and solar by 2050. These changes require significant investment and re-thinking of entire energy infrastructures and types of consumption. The Agenda also suggested, among other things, improving the efficiency of energy systems.In this paper, the interactions between charging an electric car and an innovative cogeneration system for household application (micro-solid oxide fuel cell with an integrated heating system) are investigated. The charge of the electric car by the cogenerator produces waste heat that can be used to partially cover the heat demand of the house. In this way it may be possible to increase overall efficiency and decrease total energy costs. Different innovative strategies are proposed and analyzed to manage charging an electric car and efficiently using the waste heat available. The aims of this study are to make the system grid-independent, to decrease the thermal stress of SOFCs and to determine the nominal power of an integrated heating system. The results show energy efficiency and economic profitability of the system, even if subsidies are not included. 相似文献
24.
This paper investigates the forces correlated with environmental innovations (EIs) introduced by firms in local production systems (LPS). The role of inter-firm network relationships, agglomeration economies and internationalization strategies is jointly analysed for a sample of 555 firms in the Emilia–Romagna (ER) region (North-East Italy). Cooperating with a certain kind of local actors—i.e. suppliers and universities—is the most important EI driver for the investigated firms, along with their training coverage and their adoption of information and communication technologies. The role of agglomeration economies is instead less clear-cut. They spur EIs only in the presence of established LPS, with idiosyncratic sector specialization, while conversely they act as EI barriers. Networking effects and agglomeration economies are instead found to strongly promote the adoption of EIs by multinational firms, thus highlighting the importance of local–global interactions. Interesting specifications for these results are found for particular kinds of EIs, in such fields as CO2 abatement and ISO labelling, generally extending the analysis of EI drivers by joining local and international factors. In addition, the role of regulatory sector factors confirms the induced innovation hypothesis and provides a robustness check to our results. 相似文献
25.
Jun Wang Cheuk Tang Mario G. Ferruzzi Bing Gong Brian J. Song Elsa M. Janle Tzu‐Ying Chen Bruce Cooper Merina Varghese Alice Cheng Daniel Freire Amanda Bilski Jessica Roman Tuyen Nguyen Lap Ho Stephen T. Talcott James E. Simon Qingli Wu Giulio M. Pasinetti 《Molecular nutrition & food research》2013,57(12):2091-2102
26.
Simone Ceriani Giulio Fontana Alessandro Giusti Daniele Marzorati Matteo Matteucci Davide Migliore Davide Rizzi Domenico G. Sorrenti Pierluigi Taddei 《Autonomous Robots》2009,27(4):353-371
A trustable and accurate ground truth is a key requirement for benchmarking self-localization and mapping algorithms; on the
other hand, collection of ground truth is a complex and daunting task, and its validation is a challenging issue. In this
paper we propose two techniques for indoor ground truth collection, developed in the framework of the European project Rawseeds, which are mutually independent and also independent on the sensors onboard the robot. These techniques are based, respectively,
on a network of fixed cameras, and on a network of fixed laser scanners. We show how these systems are implemented and deployed,
and, most importantly, we evaluate their performance; moreover, we investigate the possible fusion of their outputs. 相似文献
27.
28.
29.
Giulio?IacucciEmail author Juha?Kela Pekka?Pehkonen 《Personal and Ubiquitous Computing》2004,8(2):100-109
Information technology research has mainly focussed on supporting visitors with guides, whilst a lot of opportunities for the development of technology for collecting, manipulating and re-travelling through material from the visits remain unexplored. On the basis of observations from a specific setting, we have developed prototype technology to combine multimedia content with position information. In particular, we developed mobile support to record and organise multimedia using the walked path in order to preserve more of the experience of the visit. We created tools to edit and store multimedia paths. Additional components make it possible to configure a mixed-media environment to navigate a multimedia path, using such physical interfaces as gesturing, and link the recorded media to other artefacts. When discussing field observations of current practices and prototype trials, we investigate what kind of functionality is needed to support the whole activity of collecting, manipulating and playing multimedia content in combination with position information. 相似文献
30.