全文获取类型
收费全文 | 257篇 |
免费 | 10篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 48篇 |
机械仪表 | 1篇 |
建筑科学 | 7篇 |
矿业工程 | 1篇 |
能源动力 | 59篇 |
轻工业 | 15篇 |
水利工程 | 1篇 |
石油天然气 | 5篇 |
无线电 | 18篇 |
一般工业技术 | 34篇 |
冶金工业 | 41篇 |
原子能技术 | 1篇 |
自动化技术 | 34篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 11篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 9篇 |
2017年 | 9篇 |
2016年 | 4篇 |
2015年 | 3篇 |
2014年 | 16篇 |
2013年 | 18篇 |
2012年 | 13篇 |
2011年 | 13篇 |
2010年 | 11篇 |
2009年 | 11篇 |
2008年 | 12篇 |
2007年 | 16篇 |
2006年 | 9篇 |
2005年 | 8篇 |
2004年 | 9篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 7篇 |
1998年 | 14篇 |
1997年 | 2篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有267条查询结果,搜索用时 0 毫秒
1.
Experimental and numerical assessment of gate-lag phenomena in AlGaAs-GaAs heterostructure field-effect transistors (FETs) 总被引:1,自引:0,他引:1
Verzellesi G. Mazzanti A. Basile A.F. Boni A. Zanoni E. Canali C. 《Electron Devices, IEEE Transactions on》2003,50(8):1733-1740
Gate-lag effects are characterized in AlGaAs-GaAs heterostructure field-effect transistors (HFETs) by means of measurements and numerical device simulations. Gate lag increasingly affects device switching at increasing ungated recess extension, suggesting that responsible deep levels be located at the ungated, recess surface of the HFET. Gate lag diminishes by making the off-state gate-source voltage less negative and by increasing the drain bias. Increasing the temperature makes the turn-on transient faster at low drain bias, while slightly delaying it at high drain bias. Numerical device simulations accounting for acceptor-like traps at the ungated surface predict gate-lag phenomena in good agreement with experiments, reproducing correctly the observed bias and temperature dependences. Simulations show that surface states behave, during the turn-on transient, as hole traps capturing holes attracted at the ungated surface by the negative trapped charge. 相似文献
2.
Nicolas Clauvelin Basile Audoly Sébastien Neukirch 《Scientific Modeling and Simulation》2007,14(1):95-101
The DNA molecule is modeled as an elastic rod with bending and twisting rigidities, subjected to external tension and twist applied at one end, the other end being clamped. We study the plectonemic equilibrium of such a rod, taking into account the impenetrability constraint. Numerical solutions of this boundary value problem have previously shown that purely elastic models can reproduce the supercoiling response of the DNA molecule. Using a variational approach, we derive analytical formulae for the elastic response of the filament, and extend former numerical results. 相似文献
3.
4.
A catalyst for NOx storage/reduction was prepared to improve the activity of Ba–Pt/γ-Al2O3 by replacing Ba with a mixture of Ba and Mg. The catalyst was prepared by impregnating Pt and then co-impregnating Ba and
Mg (Mg:Ba molar ratio = 1) on commercial γ-Al2O3. The tests have been carried out in the presence of CO2 at temperatures between 200 and 400 °C in order to understand the role of both the feed and various alkaline-earth metals.
The storage capacity of the two catalysts was different like the mechanism in the reduction process. 相似文献
5.
Real‐time updating of structural mechanics models using Kalman filtering,modified constitutive relation error,and proper generalized decomposition 下载免费PDF全文
Basile Marchand Ludovic Chamoin Christian Rey 《International journal for numerical methods in engineering》2016,107(9):786-810
The paper aims at proposing a new strategy for real‐time identification or updating of structural mechanics models defined as dynamical systems. The main idea is to introduce the modified constitutive relation error concept, which is a practical tool that enables to efficiently solve identification problems with highly corrupted data, into the Kalman filtering, which is a classical framework for data assimilation. Furthermore, a PGD‐based model reduction method is performed in order to optimize capabilities of the online updating strategy. Performances of the proposed approach, in terms of robustness gain and computational cost reduction, are illustrated on several unsteady thermal applications. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
6.
7.
8.
9.
A. Iulianelli C. Algieri L. Donato A. Garofalo F. Galiano G. Bagnato A. Basile A. Figoli 《International Journal of Hydrogen Energy》2017,42(34):22138-22148
The potentialities of PEEK-WC (thermally treated at 120 °C) and PLA polymers have been studied in the field of membrane technology applied to H2 separation/purification. In particular, for low/medium temperature operation (80 °C), PEEK-WC membranes (66 μm thick) showed good results in terms of H2/CH4 separation, showing an ideal selectivity value higher than 40. Meanwhile, we observed interesting selectivity also for H2/N2 and H2/CO2 separation, reaching values of 24 and 20, respectively. As expected, for PEEK-WC thermally treated membranes, the H2 permeating flux increased from 25 to 80 °C and by increasing the transmembrane pressure. Furthermore, H2 permeability at 80 °C was around 20 barrer. Concerning PLA membranes (26 μm thick), it is worth of noting that this polymer was pioneeristically used in this work as membrane application, showing great results in terms of H2/CO2 separation. Indeed, we overcame the Robeson's upper-bound (2008), achieving an ideal selectivity H2/CO2 around 25 with an H2 permeability of 25 barrer. Further advantage due to the utilization of PLA membranes was related to the temperature operations set at ambient conditions, constituting a valuable and cost-effective solution for H2/CO2 separation processes via polymeric membrane technology. 相似文献
10.