全文获取类型
收费全文 | 560315篇 |
免费 | 8014篇 |
国内免费 | 1735篇 |
专业分类
电工技术 | 10577篇 |
综合类 | 1539篇 |
化学工业 | 84578篇 |
金属工艺 | 21669篇 |
机械仪表 | 16916篇 |
建筑科学 | 14053篇 |
矿业工程 | 2847篇 |
能源动力 | 14864篇 |
轻工业 | 48789篇 |
水利工程 | 5710篇 |
石油天然气 | 10432篇 |
武器工业 | 50篇 |
无线电 | 64787篇 |
一般工业技术 | 107471篇 |
冶金工业 | 107082篇 |
原子能技术 | 10870篇 |
自动化技术 | 47830篇 |
出版年
2022年 | 5451篇 |
2021年 | 7576篇 |
2020年 | 5532篇 |
2019年 | 7087篇 |
2018年 | 8622篇 |
2017年 | 8151篇 |
2016年 | 8234篇 |
2015年 | 5833篇 |
2014年 | 9542篇 |
2013年 | 24730篇 |
2012年 | 15081篇 |
2011年 | 21588篇 |
2010年 | 16884篇 |
2009年 | 18834篇 |
2008年 | 18665篇 |
2007年 | 18367篇 |
2006年 | 16186篇 |
2005年 | 14962篇 |
2004年 | 15331篇 |
2003年 | 14956篇 |
2002年 | 14259篇 |
2001年 | 14088篇 |
2000年 | 12701篇 |
1999年 | 13288篇 |
1998年 | 33529篇 |
1997年 | 23495篇 |
1996年 | 17882篇 |
1995年 | 13381篇 |
1994年 | 11753篇 |
1993年 | 11357篇 |
1992年 | 8230篇 |
1991年 | 7665篇 |
1990年 | 7503篇 |
1989年 | 7351篇 |
1988年 | 6764篇 |
1987年 | 5996篇 |
1986年 | 5967篇 |
1985年 | 6522篇 |
1984年 | 6084篇 |
1983年 | 5418篇 |
1982年 | 5128篇 |
1981年 | 5129篇 |
1980年 | 4830篇 |
1979年 | 4717篇 |
1978年 | 4592篇 |
1977年 | 5551篇 |
1976年 | 7142篇 |
1975年 | 3968篇 |
1974年 | 3694篇 |
1973年 | 3755篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Elli Ntakou Ralph Masiello Farnaz Farzan Shay Bahramirad Aleksi Paaso M.A. Nayeem Maigha Maigha Daniel Kushner 《The Electricity Journal》2019,32(4):45-49
This paper presents part of the work ComEd and Quanta Technology have performed to quantify the locational and temporal value of DER to avoid distribution grid upgrade investments. It focuses on the formulation of a robust and efficient algorithm for DER optimal dispatch on a distribution feeder to mitigate the violation of current and voltage limits using the allocated cost of capacity and locational marginal value of real and reactive DER injection/withdrawal. 相似文献
2.
Ivashchuk O. A. Ivashchuk O. D. Fedorov V. I. Shtana A. I. 《Russian Engineering Research》2020,40(11):970-972
Russian Engineering Research - Models based on regression analysis for predicting the operational efficiency of high-pressure roller crushers are considered. A systematized and structured... 相似文献
3.
Popov N. N. Presnyakov D. V. Lar’kin V. F. 《Journal of Machinery Manufacture and Reliability》2020,49(3):232-236
Journal of Machinery Manufacture and Reliability - A device based on smart alloys has been designed for use in machine building items, in particular, in nuclear engineering, for preventing... 相似文献
4.
Bakirov Zh. B. Tanirbergenova A. A. 《Journal of Machinery Manufacture and Reliability》2020,49(3):263-271
Journal of Machinery Manufacture and Reliability - The problem of calculating the reliability and fatigue life of machine parts by the fatigue failure under random changes in the actual and limit... 相似文献
5.
Salim Hengky K. Padfield Rory Lee Chew Tin Syayuti Khadijah Papargyropoulou Effie Tham Mun Hou 《Clean Technologies and Environmental Policy》2018,20(3):529-538
Clean Technologies and Environmental Policy - Food production and consumption is one of the major causes of global environmental degradation. One way to address environmental impacts in the food... 相似文献
6.
Yana Jorge Polizer-Rocha José M. Lorenzo Daniel Pompeu Isabela Rodrigues Juliana Cristina Baldin Manoela A. Pires Maria Teresa A. Freire Francisco Jose Barba Marco Antonio Trindade 《International Journal of Food Science & Technology》2020,55(3):1018-1024
This study aimed to evaluate the physicochemical characteristics and sensory attributes of beef burgers with the addition of pea fibre as a partial substitute of meat or fat. Three formulations were prepared: control (CON) – similar to the commercial formulation; fibre/less meat (FLM)—5% meat reduction and addition of 1% pea fibre; fibre/less fat (FLF)—7% fat reduction and addition of 1% pea fibre. Non-significant differences were obtained for pH, colour parameters (L* and b*), texture profile, cooking loss and size reduction among formulations. Moreover, sensory analysis with consumers of beef burgers did not indicate differences among the formulations for all the analysed attributes. Therefore, pea fibre is a promising partial replacer for meat and fat in beef burgers due to the preservation of technological parameters and sensory acceptance. 相似文献
7.
The role of the following factors in the selection of technological bases for manufacturing is considered: the accessibility of the machined surfaces; their parameters and dimensional relationships; their position relative to the forces acting; and the uniformity of the margin distribution. 相似文献
8.
Kobrakov K. I. Kurnetsov D. N. Ruchkina A. G. Sharpar N. M. 《Theoretical Foundations of Chemical Engineering》2020,54(5):1052-1056
Theoretical Foundations of Chemical Engineering - New research results, as well as those published earlier by the authors, on the synthesis of azo compounds based on nitroanilines obtained by the... 相似文献
9.
Gomes A. C. S. A. Costa L. C. Brito D. C. Frana R. J. Marques Mnica R. C. 《Polymer Bulletin》2020,77(4):1969-1981
Polymer Bulletin - In this study, we synthesized a new ion-imprinted polymer (IIP) based on introduction of amidoxime groups in acrylonitrile, complexation with Cd2+ ions and polymerization with... 相似文献
10.
Theoretical Foundations of Chemical Engineering - The extraction of nitric and oxalic acids by neutral compounds TBP, DBBP, and TBPO have been studied. The optimal conditions of their separation... 相似文献