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Zheng H.,Hubei Province Key Laboratory of Systems Science in Metallurgical Process | Zheng H.,Wuhan University of Science and Technology | Zhu S.,Wuhan University of Technology | Li Z.,Wuhan University of Technology
Gongneng Cailiao/Journal of Functional Materials | Year: 2015

The piezoresistive responses of the composites fabricated by short-cut carbon fiber mat and epoxy resin were studied by uniaxial tension tests. Positive piezoresistive effect of this composite was found in the test. The gauge factor for single-lamina carbon fiber mat/epoxy resin composite is as high as 13.9, but the resistance for this composite is observed to be decreased gradually. More stable piezoresistivity was attained in laminated composite and the gauge factors were observed to decrease with the increase of the number of the laminas. The gauge factor for 5-lamina carbon fiber mat/epoxy resin composite is 5.7. The improvement in stability and the decrease in gauge factor for the laminated composite are due to the solid conductive network of this composite. The laminated carbon fiber mat/epoxy resin composites were used as smart layers on the beam surfaces, and based on their piezoresistivities, the structural deformation monitoring upon cyclic load and the damage detecting upon monotonous load were conducted ©, 2015, Journal of Functional Materials. All right reserved. Source

Dong-Wang Z.,Wuhan University of Science and Technology | Liang W.,Hubei Province Key Laboratory of Systems Science in Metallurgical Process
aEngineering Plasticity and Its Applications - Proceedings of the 10th Asia-Pacific Conference, AEPA 2010 | Year: 2011

To study on dynamic characteristics of rock slope under blasting loads, both an indoor experiment method of concrete slope model and finite element model of that are adopted in this paper. The results show that not only propagation laws but also attenuation characteristics of the detonating earthquake waves on slope are different to those of level ground. That is to say, the attenuation of particle peak vibration on slope is much smaller along with blasting source distances than those of level ground, and there are vibration amplification effects at the top particles of the slope; On the other hand, not only can the damping ditch reduces the strength of peak particle vibration greatly, but also improves stress states of the slope under blasting loads. In addition, by comparing experiment results, the results of simulation are consistent with those of model test of the slope under blasting loads well. Source

Wang W.-B.,Hubei Province Key Laboratory of Systems Science in Metallurgical Process | Wang M.-G.,Hubei Normal University
Advanced Materials Research | Year: 2012

This paper proposes a new despeckling algorithm of SAR image based on EMD and PCA. Firstly, it approximately evaluates the noise energy in all levels of IMF according to the energy distribution model of Gaussian white noise decomposed by EMD. And then it uses PCA to decompose IMF. According to the decomposition feature of the noisy signal and the proportion of noise energy in IMF, select proper principal components to reconstruct IMF so as to further remove the IMF noise. Finally, the simulation results show that the new method can effectively delete noise, and better keep the texture details of the edges. © (2012) Trans Tech Publications. Source

Liu H.Y.,Wuhan University of Science and Technology | Liu H.Y.,Hubei Province Key Laboratory of Systems Science in Metallurgical Process | Wang H.L.,Wuhan University of Science and Technology | Li L.,Xining Special Steel Co. | And 3 more authors.
Ironmaking and Steelmaking | Year: 2011

Ti content in specimens of 80 grade wire cord steel was measured by laser ablation inductively coupled plasma mass spectrometry. It was found that the average Ti content increased and then decreased during electrical arc furnace (EAF) tapping→refining→continuous casting. Under current control condition of 80 grade wire cord steel in Nanjing Iron and Steel United Co. Ltd (NISUCL), the calculation results in several aspects such as formation thermodynamics, solidification segregation and growth kinetics of TiN particles showed that the formation of TiN only took place in the two-phase region where the solidification ratio is greater than 98%, or in solid phase region; both solidification segregation of Ti and N increased with increasing cooling rate and the segregation tendency was greater with increasing solidification fraction. The greater the cooling rate during solidification, the smaller the size of precipitated TiN particles. The size of precipitated TiN particles is 3-7 μm, which accorded with the size measured in metallographic image of TiN inclusions found in wire rod specimens. © 2011. Source

Zhu C.,University of British Columbia | Nicanfar H.,University of British Columbia | Leung V.C.M.,University of British Columbia | Li W.,University of British Columbia | And 3 more authors.
2014 IEEE International Conference on Communications, ICC 2014 | Year: 2014

By incorporating the advantages of cloud computing (CC) and wireless sensor networks (WSNs), the integration of CC and WSNs attracts a lot of attention from both academia and industry. However, trust and reputation management for CC and WSNs integration is a critical and barely explored issue, which could strongly prevent the cloud service users (CSUs) from choosing the desirable cloud service providers (CSPs) or hinder the CSP from selecting appropriate sensor network providers (SNPs). To fill the gap, this paper proposes a novel trust and reputation management system for CC and WSNs integration. Considering the attribute requirement of CSU and CSP as well as the cost, trust and reputation of the service of CSP and SNP, the proposed system achieves the following two goals: 1) calculate and manage the trust and reputation regarding the service of CSP and SNP; 2) help CSU choose CSP and assist CSP in choosing SNP. Evaluation results are also shown to verify effectiveness of the proposed system. © 2014 IEEE. Source

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