全文获取类型
收费全文 | 502篇 |
免费 | 23篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 165篇 |
金属工艺 | 8篇 |
机械仪表 | 8篇 |
建筑科学 | 7篇 |
矿业工程 | 3篇 |
能源动力 | 11篇 |
轻工业 | 17篇 |
无线电 | 37篇 |
一般工业技术 | 83篇 |
冶金工业 | 12篇 |
自动化技术 | 170篇 |
出版年
2023年 | 3篇 |
2022年 | 16篇 |
2021年 | 19篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 11篇 |
2017年 | 5篇 |
2016年 | 23篇 |
2015年 | 15篇 |
2014年 | 21篇 |
2013年 | 31篇 |
2012年 | 28篇 |
2011年 | 35篇 |
2010年 | 29篇 |
2009年 | 22篇 |
2008年 | 13篇 |
2007年 | 25篇 |
2006年 | 20篇 |
2005年 | 20篇 |
2004年 | 14篇 |
2003年 | 18篇 |
2002年 | 24篇 |
2001年 | 6篇 |
2000年 | 5篇 |
1999年 | 7篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 11篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1980年 | 5篇 |
1979年 | 6篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 4篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1963年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有526条查询结果,搜索用时 9 毫秒
371.
Fuzzy neurons may have outstanding learning abilities and are endowed with significant interpretation capabilities. In this study, we are concerned with the development of logic networks composed of fuzzy neurons. The main phase of the design includes the granulation of the output space (via triangular fuzzy sets) being realized with the use of fuzzy equalization. In the sequel these fuzzy sets are used to guide the construction of a family of fuzzy sets in the input space. Further processing of the resulting fuzzy sets deals with some additional aggregation of those that are not sufficiently distinct. This helps reduce the size of the logic network. We include comprehensive experimentation and offer a thorough interpretation of the networks. Experiments concerning real‐world continuous data help evaluate the network's appealing properties: transparent interpretability and practical feasibility. © 2006 Wiley Periodicals, Inc. Int J Int Syst 21: 1249–1267, 2006. 相似文献
372.
Witold Pawlus Hamid Reza Karimi Kjell G. Robbersmyr 《The International Journal of Advanced Manufacturing Technology》2014,70(5-8):965-993
Creating a mathematical model of a vehicle crash is a task which involves considerations and analysis of different areas which need to be addressed because of the mathematical complexity of a crash event representation. Therefore, to simplify the analysis and enhance the modeling process, in this work, a brief overview of different vehicle crash modeling methodologies is proposed. The acceleration of a colliding vehicle is measured in its center of gravity—this crash pulse contains detailed information about vehicle behavior throughout a collision. A virtual model of a collision scenario is established in order to provide an additional data set further used to evaluate a suggested approach. Three different approaches are discussed here: lumped parameter modeling of viscoelastic systems, data-based approach taking advantage of neural networks and autoregressive models and wavelet-based method of signal reconstruction. The comparative analysis between each method’s outcomes is performed and reliability of the proposed methodologies and tools is evaluated. 相似文献
373.
374.
Witold Gładkowski Grzegorz Kiełbowicz Anna Chojnacka Łukasz Bobak Radosław Spychaj Zbigniew Dobrzański Tadeusz Trziszka Czesław Wawrzeńczyk 《International Journal of Food Science & Technology》2014,49(8):1876-1885
The influence of feed supplemented with dietary sources of n‐3 polyunsaturated fatty acids (PUFAs), namely flaxseed and algae Schizochytrium sp., on the fatty acid composition of lipids from Japanese quail eggs was studied. Two groups of quails were fed for 19 weeks, starting from 6th week of life. Lipid fractions from dried egg mass of total of 4300 eggs of control and experimental group were analysed. The fatty acid profile was affected in both triacylglycerols and phospholipids. The significant (P < 0.05) increase in n‐3 PUFAs up to 7.33% in the total lipids, α‐linolenic acid (ALA, 18:3) up to 4.57% in triacylglycerols, docosahexaenoic acid (22:6, DHA) up to 23.91% in phosphatidylethanolamine and up to 4.35% in phosphatidylcholine as well as the significant (P < 0.05) reduction in n‐6/n‐3 ratio in the lipid fractions to the range of 0.9–3.7 was observed in experimental group. The incorporation of different n‐3 into lipids was selective: ALA was found in the triacylglycerol fraction, whereas EPA, DPA and DHA were detected in the phospholipid fractions, exclusively at sn‐2 position. The studies showed that the feeding quails with modified diets is effective way of biofortifying the eggs with nutritionally desired n‐3 PUFAs. 相似文献
375.
376.
Michael Bratychak Witold Brostow Victor M. Castaño Volodymyr Donchak Hrystyna Gargai 《Materials Research Innovations》2002,6(4):153-159
We have performed a comparison of efficacy of several curing agents. We have synthesized curing agents with C=C-bonds of allylic,
acrylic or peroxide group type, as derivatives of pyromellitic acid: diallylic ester (I), tetraallylic ester (II), di-(2-methacryloyloxyethyl)-pyromellitate
(III), tetra-(2-methacryloyloxyethyl)pyromellitate (IV), ditert-butylperoxypyromellitate (V) and tetratert-butylperoxypyromellitate (VI). The possibility to use these agents for curing an unsaturated film-forming copolymer which
contains polybutadiene fragments was investigated. The unsaturated curing agents (I–IV) are able to form crosslinked copolymers
in the presence of peroxide initiators such as benzoyl peroxide. The gelation process orders as well as the values of the
effective activation energies for all curing agents studied have been determined. In the presence of curing agents of methacrylic
type (III–IV) the crosslinking proceeds more rapidly than in the presence of allylic esters. Unsaturated curing agents containing
carboxylic groups (I, III) promote faster formation of three-dimensional structures than tetra-substituted derivatives of
pyromellitic acid. For curing agents of the peroxide type the inverse relation is observed. The hardness of films obtained
using carboxylic curing agents is higher than for noncarboxylic ones. Films obtained in the presence of unsaturated curing
agents exhibit higher hardness than those obtained in the presence of peroxide agents.
Electronic Publication 相似文献
377.
378.
Witold J. Stepowicz 《Solid-state electronics》1977,20(10):817-823
In this paper the influence of light on the junction capacitance of a silicon photodiode is discussed. The analysis carried out deals with an open-circuited and reverse-biased photodiode. In this analysis the dependence of the photocurrent sensitivity and the differential conductance on an illumination and an applied voltage is included. The dependence of the open-circuit voltage on an illumination, with the d.c. performance of a silicon diode at low currents taken into consideration, is also derived. The presented analysis shows that the specific performance of a photodiode gives possibilities to use this element in detecting very low illuminations. 相似文献
379.
380.
Sergiusz Basak Witold A. Charewicz 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1986,36(12):557-561
Flotation of zinc and cobalt hydroxide precipitates was investigated at total initial metal concentrations of 1 × 10?2 M with sodium dodecylbenzenesulphonate (DBSNa) and dodecyldimethylbenzylammonium bromide (DDMBABr), both at initial concentrations of 1 × 10?4 M. In particular, the granulometric analysis of precipitates and measurements of their electrokinetic potential were carried out over a wide range of acidity of aqueous precipitate suspensions. Moreover, adsorption of the flotation collectors by the precipitates as well as the rate of their sedimentation were measured. It was found that the extent of collector sorption, changes in the electrokinetic potential of precipitate grains and their aggregation affected the flotability and course of flotation of the examined precipitates. These dependencies were irregular and could be discussed in terms of chemisorption of collectors on the surface of the precipitate grains. 相似文献