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Wu H.Y.,WuhanUniversity of Technology | Fan K.,China University of Technology
Applied Mechanics and Materials

This paper proposed an online direction classifying method for constructing an intuitive tactile communication during human-robot cooperation. The proposed approach abstracts a suitable feature set from a tactile array sensor equipped on a hand-bar. This lower computation feature extraction method analyze the weighting values concerned with oriental information from principle component analysis (PCA), together with support vector machines (SVM) classifier for direction classification and recognition. Experimental results showed an average accuracy of 96.3% and a low costs of 512μs with respect to different handle gestures of the 6 touch directions, which is practicable utilized for human-robot cooperation based on tactile recognition. © (2014) Trans Tech Publications, Switzerland. Source

Liu X.,Nanjing University of Technology | Ji X.,Nanjing University of Technology | Zhang H.,Nanjing University of Technology | Fu N.,Nanjing University of Technology | And 3 more authors.
Applied Biochemistry and Biotechnology

Defined medium for arachidonic acid (ARA) production by Mortierella alpina was optimized for its metabolomics study. For this purpose, a visualization method (VM) was applied for the first time. Experiments were designed according to the uniform design with four factors (concentrations of glucose, NaNO 3, KH2PO4 and MgSO4.7H2O) for each at nine levels. Dry cell weight (DCW), ARAyield in DCW [percent (w/w)] and ARA content in total fatty acids [percent (w/w)] were considered as the three objectives. Optimization of single-objective function and multi-objective function of two objectives and three objectives was attempted. Optimal DCW, ARA yield and ARA content were predicted to occur in a medium that contained (grams per litre): glucose 35, NaNO3 1, KH2PO4 7.5 and MgSO 4.7H2O 2.6. Upon verification, the average tested DCW (12.95 g/l), ARA yield (18.89 %) and ARA content (42.36 %) were fairly close to the predicted values (12.88 g/l, 9.68 % and 35.57 %, respectively). Moreover, DCW, ARA yield and ARA content from the optimum medium increased by 35.68, 47.23 and 30.90 % compared with control, respectively, indicating that VM had succeeded in exploiting the biomass growth and ARA production by M. alpina. © Springer Science+Business Media, LLC 2012. Source

Weiqing W.,Qingdao Metro Corporation | Huanqin W.,WuhanUniversity of Technology
Applied Mechanics and Materials

In order to determine that the effect of geometric error to the machining accuracy is an important premise for the error compensation, a sensitivity analysis method of geometric error is presented based on multi-body system theory in this paper. An accuracy model of five-axis machine tool is established based on multi-body system theory, and with 37 geometric errors obtained through experimental verification, key error sources affecting the machining accuracy are finally identified by sensitivity analysis. The analysis result shows that the presented method can identify the important geometric errors having large influence on volumetric error of machine tool and is of help to improve the accuracy of machine tool economically. © (2013) Trans Tech Publications, Switzerland. Source

Liu S.,WuhanUniversity of Technology | Yu J.,WuhanUniversity of Technology | Wang W.,WuhanUniversity of Technology
Physical Chemistry Chemical Physics

We investigated the effects of annealing in air on fluorinated N-doped TiO2 (F/N-TiO2) photocatalysts prepared by hydrothermal process. The textural properties (specific surface areas) and surface properties (surface defect density, surface Ti-F density) were significantly modified upon annealing. In contrast, due to the shielding effect of surface fluorination, the phase transformation from anatase to rutile as well as removal of N-dopants during annealing was greatly inhibited. The evolution of the chemical nature of doped nitrogen species upon annealing in air was investigated and correlated with the generation and annihilation of oxygen deficiency. The defect density dominated the visible-light absorption and production of active OH. The textural properties and the surface characteristics were crucial for UV-light photocatalytic performance, while the visible-light photocatalytic activity was mainly associated with the defect density. The 300 °C-annealed F/N-TiO 2 sample showed considerable photocatalytic activity under both UV and visible-light irradiation. © 2010 the Owner Societies. Source

Li J.,Shandong University of Technology | Chen F.,WuhanUniversity of Technology | Niu J.,Shandong University of Technology | Yang Y.,WuhanUniversity of Technology | Wang Z.,WuhanUniversity of Technology
Journal of Ceramic Processing Research

In this study, α-Si3N4 ceramics were successfully prepared using MgO and AlPO4 as the sintering additives and a low temperature spark plasma sintering (SPS) technique. The resultant α-Si3N4 ceramics sintered from 1300 °C to 1500 °C show a fine microstructure with nearly no grain growth and phase transformation. The dielectric properties of the sintered ceramics are investigated in detail. α-Si3N4 ceramics with a porosity of 5-36% show a dielectric constant of 4.5-7.4 and a dielectric loss of less than 10 × 10-3. The existence of AlPO4 performing as a binder not only contributes to the low temperature sintering of fully-dense α-Si3N4 ceramics, but also reduces the dielectric constant and loss. Source

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