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Your search keyword '"Wang, Ren"' showing total 99 results
Start Over Author "Wang, Ren" Journal applied mechanics and materials
99 results on '"Wang, Ren"'

1. The Generalized Fuzzy Time Series Model for Forecasting Base on the Optimization of the Length of Intervals

Author

Yan Hong Wang and Wang Ren Qiu

Subjects
Series (mathematics), Mean squared error, Statistics, Constrained optimization, General Medicine, Interval (mathematics), Time series, Base (topology), Fuzzy logic, Algorithm, Physics::Atmospheric and Oceanic Physics, Mathematics
Abstract

Based on the analysis of some conventional fuzzy time series model,this paper proposes a new method by using a single constrained optimization to determine the interval length for improving the forecasts.The conventional fuzzy time series models are enhanced by forecast-weighted method in the forecasting.In the proposed model,which is evaluated by mean square error(MSE),fuzzy membership degrees are used to calculate forecast weights. The empirical results show that the proposed model outperforms than the conventional models.

Published
2014

2. Electrodeposition of Cobalt Nanoparticles from Mixture of 1-Butyl-3-Methylimidazolium Chloride Ionic Liquid and Urea

Author

Wang Ren, Ying Zhang, and Min Jiao Li

Subjects
Working electrode, Materials science, Scanning electron microscope, chemistry.chemical_element, Nanoparticle, General Medicine, Chloride, chemistry.chemical_compound, chemistry, Ionic liquid, Urea, medicine, Cyclic voltammetry, Cobalt, Nuclear chemistry, medicine.drug
Abstract

The electrodeposition of cobalt nanoparticles from mixture of 1-butyl-3- methylimidazolium chloride (BMIC) ionic liquid and urea was investigated. The results from the cyclic voltammetry (CV) show that the reduction of Co(II) to cobalt is an irreversible process and controlled by the diffusion of Co(II) on Pt working electrode. The cobalt nanoparticles prepared by direct current (DC) electrodeposition method at 70 °C were characterized by scanning electron microscope (SEM). Test results indicate that the Co nanoparticles are grain-like arrays and link together because of their magnetic property. The average length of these particles is about 100 nm.

Published
2011

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