全文获取类型
收费全文 | 195篇 |
免费 | 11篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 4篇 |
化学工业 | 38篇 |
金属工艺 | 13篇 |
机械仪表 | 16篇 |
建筑科学 | 19篇 |
能源动力 | 9篇 |
轻工业 | 18篇 |
水利工程 | 6篇 |
无线电 | 26篇 |
一般工业技术 | 33篇 |
冶金工业 | 6篇 |
自动化技术 | 24篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 15篇 |
2020年 | 13篇 |
2019年 | 11篇 |
2018年 | 28篇 |
2017年 | 10篇 |
2016年 | 10篇 |
2015年 | 7篇 |
2014年 | 23篇 |
2013年 | 22篇 |
2012年 | 14篇 |
2011年 | 15篇 |
2010年 | 8篇 |
2009年 | 11篇 |
2008年 | 4篇 |
2007年 | 4篇 |
2006年 | 5篇 |
2005年 | 2篇 |
2004年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有212条查询结果,搜索用时 34 毫秒
71.
Silicon - This paper presents an efficient method to improve the heating effects in Nanoscale SOI MOSFET with the Vertical Gaussian Doping Profile in Drain and Source regions (D-S-G-SOI). Three... 相似文献
72.
Silicon - In this paper, a new method is investigated to improve the breakdown voltage in the lateral power MOSFET transistors. The structure is based on Double Buried Metal Layers in the Lateral... 相似文献
73.
This study simulated the structure of a Junctionless (JL) Double-Gate (DG) Metal Oxide Semiconductor Field Effect Transistor (MOSFET) with symmetrical Side 相似文献
74.
75.
76.
Ben Seghier Mohamed El Amine Corriea José A. F. O. Jafari-Asl Jafar Malekjafarian Abdollah Plevris Vagelis Trung Nguyen-Thoi 《Neural computing & applications》2021,33(23):15969-15985
Neural Computing and Applications - Suspension bridges are critical components of transport infrastructure around the world. Therefore, their operating conditions should be effectively monitored to... 相似文献
77.
This paper deals with the stochastic placement and sizing of the distribution static compensator in the distribution systems considering uncertainty. The proposed stochastic framework utilises the point estimate method to consider the forecasting uncertainty of the active and reactive loads in the load flow equations. The objective functions to be investigated are total active power losses and the voltage profile simultaneously. In order to reach a proper compromise to satisfy all the objective functions, an interactive fuzzy satisfying approach is employed. Also, since the problem investigated is a type of discrete, nonlinear, multi-objective optimisation problem, a new modified optimisation technique is proposed to escape from the local optima as well as the premature convergence. Finally, the satisfying performance of the proposed method is examined on the 86-bus IEEE distribution system. 相似文献
78.
Abbasali TaghaviGhalesari Mohsen Isari Reza Tarinejad Abdollah Sohrabi-Bidar 《岩石力学与岩土工程学报(英文版)》2019,11(4):790-803
In this context,a new boundary element algorithm based on the time-convoluted traction kernels is employed to evaluate the spatially varying earthquake ground motions of the Pacoima dam in the USA subjected to SH,SV and P incident waves.An accurate three-dimensional(3D)model of the dam canyon is implemented into the computer code BEMSA to investigate the seismic response of the dam.The analyses are performed in time domain with a linearly elastic constitutive model for the medium.This modeling procedure has been validated by the results reported in the existing literature.According to the results of this study,the response of the dam to earthquake waves is generally influenced by predominant frequency of the incident motion,surface topography,relative distance of observation points,and type of the incident seismic wave.For the cases considered,the incident SV wave has led to the maximum amplification of incident motions,especially at the left side of the dam.The results indicate that the proposed procedure can be employed for accurate prediction of a dam response during an earthquake. 相似文献
79.
Abdollah Omrani Leonardo C. Simon Abbas A. Rostami 《Materials Science and Engineering: A》2008,490(1-2):131-137
The effects of cellulose nanofiber on the curing behavior, dynamic mechanical, and morphology properties of epoxy/diamine systems were investigated. The studies were conducted using an aliphatic triamine, diethylentriamine (Dien), and an aromatic diamine, diaminodiphenylmethan (DDM), as the curing agents in the presence of three different levels of 0.5, 2, and 5 phr of cellulose nanofiber. Calorimetry experiments were used to probe the changes in the reaction enthalpy and in the glass transition temperature (Tg) as a function of the fiber concentration. The results showed that both the Tg and the heat of reaction were increased with increasing the fiber concentration up to 2 phr. The experimental cure data obtained from in situ FT-IR measurements were used to evaluate the kinetic parameters using the modified Avrami theory of phase change. The results showed that the kinetic parameters were less sensitive to the epoxy composition. DMTA measurements showed that the storage modulus and the Tg of the composites were dependant on the level of fiber loading. SEM studies revealed that a reasonable dispersion and adhesion have been achieved between the fiber and the epoxy matrix at low concentration of fiber. It is concluded that the fiber agglomerated at high concentration of cellulose fiber prevented the formation of a homogeneous mixture, thus resulting in weak thermal and mechanical properties. 相似文献
80.
Yamanoglu Ridvan Bahador Abdollah Kondoh Katsuyoshi Gumus Serap Gokce Sinan Muratal Onur 《Powder Metallurgy and Metal Ceramics》2021,60(3-4):216-224
Powder Metallurgy and Metal Ceramics - Although magnesium is one of the materials with the lowest density, its application is limited amongst other commercial materials due to insufficient... 相似文献