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The optimization design for a complex nonlinear system is difficult to be achieved by using the traditional methods. This paper presents an optimization design method for nonlinear system by using an improved neural network. The proposed approach is a combination of error back-propagation neural network (BPNN), principal component analysis (PCA) and genetic algorithms (GAs). PCA is employed to reduce...
Group awareness theory has always been an important domain in the research of computer supported cooperative work (CSCW). After a thorough study over different kinds of group-awareness theories in recent years, and combined with today's very popular service oriented architecture (SOA) technology, we propose a new group-awareness model which is based on services. SOA technology has many advantages,...
The absorption spectrum and photoluminescence spectrum of multiwalled carbon nanotubes (MWNTs) and the peaks related with Van Hove singularities (VHS) were obtained experimentally. Both the VHS formation and the change of band gaps in MWNTs depend on the intershell interaction. The VHS makes the probability of optical transitions enhanced, but the intershell interaction suppresses such radiative transitions...
Increased atmospheric carbon dioxide (CO2) concentration will likely cause changes in plant productivity and composition that might affect soil decomposition processes. The objective of this study was to test to what extent elevated CO2 and N fertility-induced changes in residue quality controlled decomposition rates. Cotton (Gossypium hirsutum L.) was grown in 8-l pots and exposed to two concentrations...
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