全文获取类型
收费全文 | 598篇 |
免费 | 20篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 7篇 |
综合类 | 1篇 |
化学工业 | 238篇 |
金属工艺 | 25篇 |
机械仪表 | 18篇 |
建筑科学 | 9篇 |
矿业工程 | 3篇 |
能源动力 | 33篇 |
轻工业 | 40篇 |
水利工程 | 4篇 |
石油天然气 | 2篇 |
无线电 | 28篇 |
一般工业技术 | 87篇 |
冶金工业 | 22篇 |
原子能技术 | 7篇 |
自动化技术 | 95篇 |
出版年
2023年 | 8篇 |
2022年 | 64篇 |
2021年 | 63篇 |
2020年 | 28篇 |
2019年 | 30篇 |
2018年 | 33篇 |
2017年 | 26篇 |
2016年 | 28篇 |
2015年 | 26篇 |
2014年 | 24篇 |
2013年 | 30篇 |
2012年 | 36篇 |
2011年 | 27篇 |
2010年 | 32篇 |
2009年 | 26篇 |
2008年 | 17篇 |
2007年 | 17篇 |
2006年 | 22篇 |
2005年 | 14篇 |
2004年 | 7篇 |
2003年 | 10篇 |
2002年 | 10篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有619条查询结果,搜索用时 0 毫秒
71.
Paweł Wachel Grzegorz Mzyk 《International Journal of Adaptive Control and Signal Processing》2016,30(1):93-105
In the paper, the linear component of the Wiener system is identified under poor knowledge about the static subsystem nonlinearity. Unlike most of other identification methods, the proposed approach allows to decompose the problem of the Wiener system identification into two simpler subproblems. The considered methodology is based on the observation that the impulse response of the dynamic subsystem is proportional to the multiple input single output mapping, directly related to the considered system. Although derivation of the method involves gradient and kernel least squares techniques, the resulting algorithm possesses explicit form and does not utilize any difficult computational procedures. The consistency of the method is proved, and sufficient conditions for algorithm's bandwidth selection are formulated. Practical aspects of the approach are discussed, and applicability of the method for small and moderate number of observations is examined numerically. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
72.
Synchronizations in Team Automata for Groupware Systems 总被引:7,自引:0,他引:7
Maurice H. ter Beek Clarence A. Ellis Jetty Kleijn Grzegorz Rozenberg 《Computer Supported Cooperative Work (CSCW)》2003,12(1):21-69
Team automata have been proposed in Ellis (1997) as a formal framework for modeling both the conceptual and the architectural level of groupware systems. Here we define team automata in a mathematically precise way in terms of component automata which synchronizeon certain executions of actions.At the conceptual level, our model serves as a formal framework in whichbasic groupware notions can be rigorously defined and studied.At the architectural level, team automata can be used as building blocksin the design of groupware systems. 相似文献
73.
The class of external contextual languages isstrictly included in the class of linear languages. A reason for the strict inclusion in linear languages is that external contextual grammars generate languages in the exhaustive way: each sentential form belongs to the language of a grammar. In this paper we study the effect of adding various squeezing mechanisms to the basic classes of exhaustive contextual grammars. We obtain in this way a characterization of linear languages and a whole landscape of sublinear families. By restricting the contexts to be one-sided (only left-sided or only right-sided) we obtain a characterization of regular languages — here the subregular landscape reduces to two families. 相似文献
74.
Bogusława Łęska Radosław Pankiewicz Błażej Gierczyk Grzegorz Schroeder Bogumił Brzezinski 《Journal of Materials Science》2008,43(10):3459-3465
By the self-assembly monolayer (SAM) organization, three new podands belonging to silylpropanethiols have been tested as to
their ability to form nanolayers protecting the noble metal surface (gold or silver) and to form complexes with monovalent
metal cations on the metal surfaces. The stable self-assembled chemisorbed layers, providing protection to metal surface against
electrooxidation and capable of blocking propylene carbonate (PC) electroreduction and Li electrodeposition were produced.
Reflection-absorption infrared spectroscopy (RAIRS) indicated cleavage of the S–H bond upon adsorption of species 1–3 with the formation of S–Ag bonds on the metal surface. By cyclic voltammetry, it was found that the primary adsorbate formed
on a Au electrode at E
ad (between −0.2 and −1.2 V vs. SCE) underwent reductive desorption at E < −1.3 V vs. SCE. The structures of 1–3 and their complexes with Na+ cations on the Ag surfaces were calculated and visualized by the AM1d semi-empirical method. 相似文献
75.
Grzegorz S. Szymaski 《Catalysis Today》2008,137(2-4):460
Decomposition of methyl tert-butyl ether (MTBE) in the gas phase was studied using carbon catalysts with chemically modified surface. Carbon samples with different surface chemical properties were obtained from commercial activated carbon D43/1 (CarboTech, Essen, Germany) by oxidation in liquid phase with various oxidants as well as in air. The catalytic tests were performed in a flow reactor at a temperature range of 353–473 K. Isobutene and methanol are the only products of the MTBE decomposition. The generation of surface acidic oxides considerably enhances the catalytic activity of the carbons. However, the activity is controlled not only by the number and strength of acidic groups, but also by their accessibility. The most active carbon is that oxidized with air at 673 K, which contains pores wider than the pores of other oxidized carbons. 相似文献
76.
Summary Apex graph grammars are a particular type of directed node-label controlled (DNLC) graph grammars: the embedding edges are established between terminal nodes only. Apex graph grammars, slightly generalized, can generate the sets of dependency graphs of attribute grammars. The other way around, every apex graph language can be obtained from such a dependency graph language by a graph replacement (which is an operation analogous to a string homomorphism). 相似文献
77.
The Co/CeO2 catalysts obtained by co-precipitation method were used in the steam reforming of ethanol (SRE). The influence of cobalt active phase content (15–29 wt%), the reaction temperature (420–600 °C) and H2O/EtOH molar ratio (12/1 and 6/1) were examined. The physicochemical characterization revealed that the cobalt content of the catalyst influences the metal-support interaction which results in catalyst performance in SRE process. The differences between catalytic properties of the Co/CeO2 catalysts with different metal loading in SRE process decayed at 500 °C for H2O/EtOH = 12/1. The best performance among the tested catalysts showed the 29Co/CeO2 catalyst with the highest cobalt content, exhibiting the highest ethanol conversion, selectivity to two most desirable products and the lowest selectivity to by-products in comparison with catalysts containing smaller amount of metal. Its catalytic properties results probably from its unique physicochemical properties, i.e this catalyst contains large amount of cobalt but the metal crystallites are relatively small. Regardless cobalt content, an increase in the water-to-ethanol molar ratio in the feed increased the concentration of hydrogen an carbon dioxide and decreased formation of carbon monoxide, acetone, aldehyde and ethylene. 相似文献
78.
Katarzyna Tokarczyk-Dorociak Jan K. Kazak Szymon Szewrański Anna Haładyj Łukasz Szkudlarek Grzegorz Chrobak 《影响评估与项目评价》2019,37(2):150-164
Guidelines and instructions for Environmental Impact Assessment and Strategic Environmental Assessment (together referred to as EA here) are developed to improve the quality of legal requirements’ implementation and to support EA procedure accomplishment. However, to date, it has not been checked whether they are useful for practitioners. Therefore, the aim of the study underlying this paper was to verify, based on the experience of Polish EA experts, whether guidelines and instructions are useful in their everyday work. A qualitative study comprising of a questionnaire survey and interviews tested whether (1) EA practitioners know and use the Polish and EU guidelines, (2) how EA practitioners evaluate the validity and usefulness of such instructions, and (3) in which areas there is a lack of instructions and guidelines. The results show a low level of knowledge of national and EU handbooks. Those guidelines focusing on legal procedures, road investments and designing animal passageways are considered to be the most useful. Moreover, practitioners indicate that EU guidelines should be translated into Polish. Most important for practitioners is the linking of guidelines with the EA procedure, so that they can become a platform for dialogue of all stakeholders. 相似文献
79.
ABSTRACTWe present the methodology and results of participatory design of a robot for presenting an epileptic seizure and a scenario of the educational workshop using this robot. Children with epilepsy encounter stigma and stereotypes and may receive inadequate aid when having an epileptic seizure. The goal of the larger project was to use the prototype device in a series of workshops for improving teachers' actions during an epileptic seizure and their attitudes towards epileptic students. In this paper, we show how various design goals for an educational robot were accomplished to fit the needs of all identified stakeholders, particularly people with epilepsy.We used a co-design (participatory design) approach through a series of meetings participated by members of the association Polish Association for People Suffering from Epilepsy, students and faculty members of the biomedical engineering and robotics departments, teachers, psychologists and medical specialists (epileptologist, neurologist).These meetings created an opportunity for a better understanding of the (functional and nonfunctional) requirements and resulting tradeoffs and led the participants to find appropriate solutions. Participation of people with epilepsy in the design process allowed them to deal with the potentially stereotyped representation of themselves. The prototype robot, therefore, combined goals of various stakeholders, such as an accurate presentation of an epileptic seizure, lightweight, ease of use and control, while preserving the dignity of people with epilepsy.As a result of the co-designing process, an inexpensive robot was created and used in a series of 10 pilot workshops with 217 participants, mainly teachers of primary and middle schools. Teachers improved their understanding of epilepsy and suggested further improvements to the system. 相似文献