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281 results on '"Wang, Su-fang"'

60. Energetics and electronic structure of a single copper atomic chain wrapped in a carbon nanotube: a first-principles study

Author

Zhang Jian-Min, Wang Su-Fang, Du Xiu-Juan, and Xu Ke-Wei

Subjects
Materials science, Band gap, Fermi level, General Physics and Astronomy, chemistry.chemical_element, Charge density, Nanotechnology, Carbon nanotube, Electronic structure, Copper, Molecular physics, law.invention, symbols.namesake, chemistry, law, symbols, Density functional theory, Carbon
Abstract

In the generalized gradient approximation, the energy and electronic structure are investigated for a single copper atomic chain wrapped in (4, 4), (5, 5) and (6, 6) armchair carbon nanotubes by using the first-principles projector-augmented wave potential within the framework of density functional theory. The results show that the (4, 4) and (5, 5) tubes are too narrow to wrap a Cu chain, but the (6, 6) tube is nearly ideal to wrap a Cu chain on its centre axis. Wider tubes are anticipated to wrap more than one Cu chain spontaneously with forces amounting to a fraction of a nanonewton. Although the tube–chain interaction decreases with the increase of the tube diameter of (4, 4), (5, 5) and (6, 6) successively, the charge density of the Cu@(6, 6) combined system still does not show complete superposition of that of the pristine (6, 6) tube and Cu chain. Successively reducing the restrictions of (4, 4), (5, 5) and (6, 6) tubes on the Cu chain leads to a reduction in shift of the highest peak of the Cu chain towards lower energies, that is from −0.5177 eV of the isolated Cu chain to −1.36785 eV, −0.668 eV and −0.588 eV for the Cu@(4, 4), Cu@(5, 5) and Cu@(6, 6) systems, respectively. In reverse, the strong metallic character of the Cu chain also enhances the metallic character of the combined systems so that the broader pseudogaps of the pristine carbon nanotubes around the Fermi level change into the narrow pseudogaps of the combined systems.

Published
2009
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67. Application of Kohonen Neural Networks for Shipper Segmentation in Logistics Centers Planning

Author

Wang Su-fang, Zhang Yong, and Li Jian

Subjects
Measure (data warehouse), Market segmentation, Operations research, Computer science, Market orientation, Segmentation, Plan (drawing), Kohonen neural network
Abstract

It is a strategic measure for the regional logistics system being promoted to plan the logistics centers based on the appropriate market orientation. Aimed at the importance of the market orientation for the logistics centers, the evaluating procedure of the logistics demand of the logistics centers is proposed relying on the market segmentation, and one Kohonen neural networks model for the shippers segmentation is constructed in this paper which is able to erect the relationship between the shippers and the available logistics demand of the logistics centers to ensure the correct market orientation. Besides, an example is to illustrate the validity of the model.

Published
2007
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68. Designing a Reverse Logistics Network Considering Risk Management

Author

Wang Su-fang, Zhang Yong, Li Xuhong, and Xie Lin-jun

Subjects
Mathematical optimization, Operations research, business.industry, Computer science, Risk measure, Fuzzy set, ComputerApplications_COMPUTERSINOTHERSYSTEMS, Reverse logistics, Fuzzy logic, Genetic algorithm, Integrated logistics support, business, Integer programming, Risk management
Abstract

According to the complexity and risk of the reverse logistics, the main objective of this paper is to propose a multistage methodology for designing a reverse logistics network from the risk management perspective. Firstly, we applied fuzzy DEA model to assess the candidate reverse logistics suppliers based on the risk management. Furthermore, we founded a mixed integer programming model by considering the risk measure of every reverse logistics supplier. Lastly, we designed a hybrid genetic algorithm to solve the mixed integer programming model to allocate the reverses logistics needs and select the optimal reverse logistics supplier combination. Moreover, we analyzed a numerical example to illustrate the feasibility of the methodology studied in this paper to consider the risk management. The research will improve the traditional location-allocation model to satisfy the risk environment, and develop the risk management theory in the reverse logistics fields.

Published
2007
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78. Up-regulation of heat shock protein 70-1 (Hsp70-1) in human limbo-corneal epithelial cells cultivated on amniotic membrane: A proteomic study

Author

Ma, David Hui-Kang, primary, Lai, Jui-Yang, additional, Yu, Szu-Tzu, additional, Liu, Jia-Ye, additional, Yang, Unique, additional, Chen, Hung-Chi Jesse, additional, Yeh, Lung-Kung, additional, Ho, Yi-Ju, additional, Chang, Grace, additional, Wang, Su-Fang, additional, Chen, Jan-Kan, additional, and Lin, Ken-Kuo, additional

Published
2012
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87. Maternal cypermethrin exposure during lactation impairs testicular development and spermatogenesis in male mouse offspring

Author

Wang, Hua, primary, Wang, Su-Fang, additional, Ning, Huan, additional, Ji, Yan-Li, additional, Zhang, Cheng, additional, Zhang, Ying, additional, Yu, Tao, additional, Ma, Xing-Hao, additional, Zhao, Xian-Feng, additional, Wang, Qun, additional, Liu, Ping, additional, Meng, Xiu-Hong, additional, and Xu, De-Xiang, additional

Published
2010
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