全文获取类型
收费全文 | 39958篇 |
免费 | 1768篇 |
国内免费 | 57篇 |
专业分类
电工技术 | 286篇 |
综合类 | 38篇 |
化学工业 | 9156篇 |
金属工艺 | 735篇 |
机械仪表 | 781篇 |
建筑科学 | 1279篇 |
矿业工程 | 78篇 |
能源动力 | 1260篇 |
轻工业 | 7032篇 |
水利工程 | 393篇 |
石油天然气 | 180篇 |
武器工业 | 2篇 |
无线电 | 1781篇 |
一般工业技术 | 5801篇 |
冶金工业 | 7167篇 |
原子能技术 | 257篇 |
自动化技术 | 5557篇 |
出版年
2024年 | 77篇 |
2023年 | 309篇 |
2022年 | 859篇 |
2021年 | 1170篇 |
2020年 | 823篇 |
2019年 | 988篇 |
2018年 | 1308篇 |
2017年 | 1261篇 |
2016年 | 1376篇 |
2015年 | 1131篇 |
2014年 | 1482篇 |
2013年 | 2828篇 |
2012年 | 2269篇 |
2011年 | 2558篇 |
2010年 | 1949篇 |
2009年 | 1970篇 |
2008年 | 1772篇 |
2007年 | 1584篇 |
2006年 | 1229篇 |
2005年 | 1031篇 |
2004年 | 997篇 |
2003年 | 859篇 |
2002年 | 801篇 |
2001年 | 545篇 |
2000年 | 534篇 |
1999年 | 587篇 |
1998年 | 2414篇 |
1997年 | 1559篇 |
1996年 | 1098篇 |
1995年 | 605篇 |
1994年 | 518篇 |
1993年 | 543篇 |
1992年 | 199篇 |
1991年 | 189篇 |
1990年 | 159篇 |
1989年 | 186篇 |
1988年 | 158篇 |
1987年 | 142篇 |
1986年 | 119篇 |
1985年 | 163篇 |
1984年 | 117篇 |
1983年 | 92篇 |
1982年 | 107篇 |
1981年 | 108篇 |
1980年 | 111篇 |
1979年 | 60篇 |
1978年 | 51篇 |
1977年 | 178篇 |
1976年 | 340篇 |
1975年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Bravo-Montes J. A. Martín-Toledano A. Sánchez-Macián A. Ruano O. Garcia-Herrero F. 《The Journal of supercomputing》2022,78(6):8056-8080
The Journal of Supercomputing - CMOS technology is facing physical limitations in scaling the manufacturing process. Therefore, to deepen the development of better designs in a smaller area, it is... 相似文献
92.
Roldão Luis de Charette Raoul Verroust-Blondet Anne 《International Journal of Computer Vision》2022,130(8):1978-2005
International Journal of Computer Vision - Semantic scene completion (SSC) aims to jointly estimate the complete geometry and semantics of a scene, assuming partial sparse input. In the last years... 相似文献
93.
R.?KovácsEmail authorView authors OrcID profile P.?Ván 《International Journal of Thermophysics》2016,37(9):95
Heat conduction at low temperatures shows several effects that cannot be described by the Fourier law. In this paper, the performance of various theories is compared in case of wave-like and ballistic propagation of heat pulses in NaF. 相似文献
94.
95.
Introduction and General Overview of Cyclodextrin Chemistry 总被引:6,自引:0,他引:6
Szejtli J 《Chemical reviews》1998,98(5):1743-1754
96.
The universal bio-optical algorithm of the Coastal Zone Color Scanner (CZCS) for case I waters implicitly contains an average covariance of the absorption by phytoplankton and colored dissolved organic matter (CDOM) and detritus. We made that covariance explicit by combining the CZCS algorithm with an expression for reflectance. The spectral variation of absorption by CDOM plus detritus for case I waters may be estimated by the expression a(gd(λ)) = 2a(ph)(443)*chl{exp[-0.013(λ - 443)]. 相似文献
97.
S. Rodríguez C. Lafuente J. A. Carrión F. M. Royo J. S. Urieta 《International Journal of Thermophysics》1996,17(6):1281-1288
Excess Volumes,V
E, and excess viscosities,
E, at 293.15 and 313.15 K are reported for binary mixtures of some cyclic ethers (tetrahydrofuran, tetrahydropyran, 2-methyltetrahydrofuran and 2,5-dimethyltetrahydrofuran) + bromocyclohexane. These properties were obtained from density and viscosity measurements.
E and
E show negatives values for all the mixtures. 相似文献
98.
E Maganto Pavón 《Canadian Metallurgical Quarterly》1996,20(6):522-533
In spite of the names and works of practically all the early 19th Century Spanish specialists in urinary tract being widely known, there are still in my opinion several names and writings, either forgotten or misplaced in newspaper libraries, archives and general libraries, awaiting to be discovered. The second half of the 19th Century was a prolific age in every aspect of Spanish life, most particularly literature. In Medicine, apart from the well known professional writings, the number of scientific journals and publications, whether in the form of brochures or divulgative articles, that came to light was countless. Computer management of collections currently under implementation in many registers, will allow their location and the finding of new texts. One of these long forgotten pioneers, is Doctor Alejandro Settier (1858-1915), a Valencian practitioner who describes himself as a "disciple of the Paris hospitals and specialist in genitourinary tract disorders", who practised in Madrid between 1883 and 1890. Surprisingly, and in spite of him being the most prolific author in urological issues during the last century (my investigations show he is the author of 2 books, 3 brochures and 40 articles in journals), neither his name nor his work, as far as we know, are mentioned by none of the historians consulted, which is nothing but highly surprising if we also take into consideration that Alejandro Settier was the founder of the first Spanish monographic journal for urinary disorders: "Gaceta de enfermedades de los órganos génito-urinarios" (Gazette of genitourinary organs disorders), Madrid 1887, which in spite of its short existence, can be considered as the first scientific periodical publication in our specialty. 相似文献
99.
Julián D. Arias-Londoño Author Vitae Juan I. Godino-Llorente Author Vitae Nicolás Sáenz-Lechón Author Vitae Author Vitae Germán Castellanos-Domínguez Author Vitae 《Pattern recognition》2010,43(9):3100-3112
This paper presents new a feature transformation technique applied to improve the screening accuracy for the automatic detection of pathological voices. The statistical transformation is based on Hidden Markov Models, obtaining a transformation and classification stage simultaneously and adjusting the parameters of the model with a criterion that minimizes the classification error. The original feature vectors are built up using classic short-term noise parameters and mel-frequency cepstral coefficients. With respect to conventional approaches found in the literature of automatic detection of pathological voices, the proposed feature space transformation technique demonstrates a significant improvement of the performance with no addition of new features to the original input space. In view of the results, it is expected that this technique could provide good results in other areas such as speaker verification and/or identification. 相似文献
100.
Levente Sajó Zsófia Ruttkay Attila Fazekas 《International journal of human-computer studies》2011,69(7-8):483-495
In this paper we present Turk-2, a hybrid multi-modal chess player with a robot arm and a screen-based talking head. Turk-2 can not only play chess, but can see and hear the opponent, can talk to him and display emotions. We were interested to find out if a simple embodiment with human-like communication capabilities enhances the experience of playing chess against a computer. First, give an overview of the development road to multi-modal communication with computers. Then we motivate our research with a hybrid system, we introduce the architecture of Turk-2, we describe the human experiments and its evaluation. The results justify that multi-modal interaction makes game playing more engaging, enjoyable – and even more effective. These findings for a specific game situation provide yet another evidence of the power of human-like interaction in turning computer systems more attractive and easier to use. 相似文献