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Lin L.-J.,Sichuan University | Yin Y.,Sichuan Special Equipment Inspection Institute
FENDT 2014 - Proceedings, 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, Increasingly Perfect NDT/E | Year: 2015

In order to measure the magnetic tile size automatically, a method based on sub-pixel image segmentation was proposed. After getting the image contour based on dynamic threshold, the sub-pixel edge of magnetic tile through the second derivative edge extraction was got. At the last, the fitting method about magnetic tile size and the arc radius was produced. © 2014 IEEE. Source


Ding W.,Xihua University | Ding W.,Shandong Normal University | Hou Z.,Shandong Normal University | Che Z.,Xihua University | And 4 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2016

In this work, soybean lipoxygenase enzyme was immobilized on the magnetic Fe3O4 nanoparticles to oxidate chlorpromazine (CPZ). The physicochemical properties of the nanoparticles were characterized with transmission electronic microscopy (TEM), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermal gravimetric analysis (TGA), and the magnetic properties were detected by a vibrating sample magnetometer (VSM). The TEM images indicated the surface and the size of the immobilized enzyme were much rougher and thicker than those of the naked particles. The analyses of XRD patterns showed that the structure of the magnetic nanoparticles had no significant change while the nanoparticles also exhibited higher superparamagnetism at room temperature. Compared to free enzyme or the enzyme immobilized with other methods, the optimal pH, temperature and H2O2 concentration for the activity of immobilized enzyme did not have great changes, but the immobilized enzyme was more stable and less sensitive to the change of the influence factors than free counterpart. The immobilized enzyme could be recovered easily by magnetic separation and could be reused for many times in the process of CPZ oxidation. The results obtained by simulating the model of Michaelis-Menten indicated that the reaction of CPZ oxidation followed Michaelis-Menten kinetics and the enzyme still retained its affinity for CPZ while the enzyme was immobilized. Copyright © 2016 American Scientific Publishers All rights reserved. Source


Guo X.,University of Electronic Science and Technology of China | Tang B.,University of Electronic Science and Technology of China | Liu J.,Sichuan Special Equipment Inspection Institute | Chen H.,University of Electronic Science and Technology of China | Zhang S.,University of Electronic Science and Technology of China
Journal of Alloys and Compounds | Year: 2015

Abstract The microwave dielectric properties and the morphology of Ba6-3xNd8+2xTi18-y(Cr1/2Nb1/2)yO54 (x = 0.75, 0 ≤ y ≤ 3.0) ceramics prepared under different sintering conditions were investigated in this work. The effects of substitutions on the microstructure and microwave dielectric properties were discussed. The X-ray diffraction (XRD) patterns of the sintered samples revealed a single-phase formation BaNd2Ti4O12 with a tungsten bronze type structure in the system. The results of energy dispersive spectrometer (EDS) and lattice parameters calculated on XRD data could confirm the substitution at B-site. A small amount of substitutions improved quality factor value (Q × f) and the temperature coefficient of resonant frequency (τf) but led to a decrease of the permittivity. The temperature coefficient of resonant frequency (τf) was found to decrease with increasing substitutions because of the declination of tolerance factor (t). And the τf could be adjusted from +62.4 ppm/°C to -7.3 ppm/°C with increment of substitutions. Finally, excellent dielectric properties were obtained as y was 0.5 sintered at 1400 °C for 2 h in air: εr = 88.6, Q × f = 11486 GHz, τf = +37.1 ppm/°C. © 2015 Elsevier B.V. Source


Ji X.,Chongqing University of Science and Technology | Lu X.,Chongqing University | Kang Y.,Chongqing University | Wang Q.,Chongqing University | Chen J.,Sichuan Special Equipment Inspection Institute
Advanced Powder Technology | Year: 2014

Blast cap is the key component of air distributor in circulating fluidized bed (CFB) boilers. Its configuration and performance affects the fluidization quality of the bed, as well as the boiler performance. With the advantage of controlling the jet penetration characteristics and the resistance coefficient individually, bell type blast cap has been widely applied in big-scale utility CFB boilers. Moreover, the inner circuitous gas pass of the bell-type blast cap is able to prevent the bed material from flowing backward into the air chamber effectively, and its tube shield is also convenient to be maintained and replaced. Consequently, the bell-type blast cap is also fit for the small scale industrial CFB boilers with lower operation and maintenance levels in spite of higher manufacturing cost. At present, bell type blast cap is mainly applied in the large scale utility CFB boilers, seldom employed in the small scale industrial CFB boilers with lower bed pressure drop. In the study, aim to acquire favorable fluidization quality and reasonable pressure drop of the bed of small scale industrial CFB boiler, the air jet penetration characteristics of the bell type blast cap were investigated in static beds composed of two typical solids in CFB individually, and the impacts of the inner configuration on blast cap's resistance characteristics were studied via numerical simulation. The detailed design principle and approach of bell type blast cap was proposed finally based on the study results. © 2013 The Society of Powder Technology Japan. Published by Elsevier B.V. Source


Lin L.,Chengdu University of Technology | Yin Y.,Sichuan Special Equipment Inspection Institute | Li X.,Xihua University | Yin G.,Sichuan University
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2016

To meet the needs of the machine vision automatic detection system about the magnetic tile surface defects, a defect extraction method is proposed in this paper based on the Contourlet packet transform(CPT)formed by the stationary wavelet packet(SWP)and nonsubsampled directional filter bank(NSDFB). This method fully considers the low contrast, complex background and uneven brightness of the magnetic tile surface defects. Through analyzing the CPT theory and the SWP time-invariant feature, a new Contourlet packet transform is created to ensure the signal multi-scale direction selectivity. According to the signal CPT coefficients with high inter-scale correlations, the image denoising algorithm based on CPT is proposed. As the CPT sub-band coefficients have different 3D features, the adaptive threshold can fit these coefficients and make the defect coefficients retained. Then the new CPT coefficients are reconstructed via the inverse Contourlet packet transform, and the magnetic tile surface defects are got. The experimental results indicate that the proposed method can eliminate the magnetic tile image noise effectively and improve the accuracy rate of extracting the defects to 95% when it is compared with the Sobel and wavelet packet. © 2016, The Editorial Board of Journal of Basic Science and Engineering. All right reserved. Source

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