全文获取类型
收费全文 | 114篇 |
免费 | 6篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 19篇 |
金属工艺 | 2篇 |
机械仪表 | 8篇 |
建筑科学 | 4篇 |
矿业工程 | 1篇 |
能源动力 | 4篇 |
轻工业 | 5篇 |
水利工程 | 16篇 |
石油天然气 | 5篇 |
无线电 | 7篇 |
一般工业技术 | 17篇 |
冶金工业 | 5篇 |
原子能技术 | 2篇 |
自动化技术 | 24篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 5篇 |
2021年 | 9篇 |
2020年 | 6篇 |
2019年 | 10篇 |
2018年 | 15篇 |
2017年 | 6篇 |
2016年 | 9篇 |
2015年 | 8篇 |
2014年 | 6篇 |
2013年 | 11篇 |
2012年 | 3篇 |
2011年 | 8篇 |
2010年 | 3篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1997年 | 1篇 |
1985年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有122条查询结果,搜索用时 15 毫秒
111.
Farzin Arjmand Jiamei Wang Lefu Zhang 《Journal of Materials Engineering and Performance》2016,25(3):809-819
The corrosion inhibition performance of sodium dodecyl sulfate (SDS) and cetyltrimethyl ammonium bromide (CTAB) on carbon steel was investigated in sodium chloride solutions. Using an experimental design strategy pH, chloride concentration, SDS/CTAB concentrations, and temperature were optimized by conducting only 30 experiments. The optimum value of each factor was obtained from the designed matrix of the experiments based on the lowest log I corr value calculated for each experimental condition. The 3D surface plots of the electrochemical response (log I corr) against each factor were constructed. The optimum conditions in which the lowest log I corr can be achieved were found as follows: pH 12, [Cl?] ≈ 1 M, [SDS] ≈ 200 ppm, [CTAB] ≈ 20 ppm, and T ≈ 10 °C. 相似文献
112.
Water Resources Management - In this study, a novel least square support vector machine (LSSVM) model integrated with gradient-based optimizer (GBO) algorithm is introduced for the assessment of... 相似文献
113.
114.
115.
In the present study the membrane fouling in microfiltration used for cell harvesting in a deadend system has been investigated.
Experimental results were analysed in terms of existing membrane filtration models and membrane resistances. The cake filtration
model (CFM) and standard blocking model (SBM) have been considered in this study. Various membrane resistances were determined
at different processing time, feed concentration and stirring speed. Resistances to permeation in this system include filter
medium, pore blocking, adsorption, cake layer and concentration polarization. 相似文献
116.
117.
Reza Jafari Nedoushan Mahmoud Farzin Mohammad Mashayekhi Dorel Banabic 《Metallurgical and Materials Transactions A》2012,43(11):4266-4280
A constitutive model is proposed for simulations of hot metal forming processes. This model is constructed based on dominant mechanisms that take part in hot forming and includes intergranular deformation, grain boundary sliding, and grain boundary diffusion. A Taylor type polycrystalline model is used to predict intergranular deformation. Previous works on grain boundary sliding and grain boundary diffusion are extended to drive three-dimensional macro stress?Cstrain rate relationships for each mechanism. In these relationships, the effect of grain size is also taken into account. The proposed model is first used to simulate step strain-rate tests and the results are compared with experimental data. It is shown that the model can be used to predict flow stresses for various grain sizes and strain rates. The yield locus is then predicted for multiaxial stress states, and it is observed that it is very close to the von Mises yield criterion. It is also shown that the proposed model can be directly used to simulate hot forming processes. Bulge forming process and gas pressure tray forming are simulated, and the results are compared with experimental data. 相似文献
118.
119.
120.
RNA nanoparticles have applications in the treatment of cancers and viral infection; however, the instability of RNA nanoparticles has hindered their development for therapeutic applications. The lack of covalent linkage or crosslinking in nanoparticles causes dissociation in vivo. Here we show that the packaging RNA of bacteriophage phi29 DNA packaging motor can be assembled from 3-6 pieces of RNA oligomers without the use of metal salts. Each RNA oligomer contains a functional module that can be a receptor-binding ligand, aptamer, short interfering RNA or ribozyme. When mixed together, they self-assemble into thermodynamically stable tri-star nanoparticles with a three-way junction core. These nanoparticles are resistant to 8 M urea denaturation, are stable in serum and remain intact at extremely low concentrations. The modules remain functional in vitro and in vivo, suggesting that the three-way junction core can be used as a platform for building a variety of multifunctional nanoparticles. We studied 25 different three-way junction motifs in biological RNA and found only one other motif that shares characteristics similar to the three-way junction of phi29 pRNA. 相似文献