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Wang X.H.,Wuhan University of Technology | Jiao Y.L.,Shangqiu Vocational and Technical College | Yang J.,Wuhan University of Technology | Niu Y.C.,Wuhan University of Technology
International Journal of Sensor Networks | Year: 2016

This paper studied the detection of pipeline corrosion crack acoustic emission signal, using a Nielsen-Hsu pencil break method to simulate the fault detection of lead pipe crack. According to the actual detection phenomenon and the collected data, this paper analyses the crack signal attenuation in the communication process, the impact of the time difference measurement method for locating, as well as the reason of generating false location and leakage location. According to the time difference positioning method, compensation method is presented to change the signal attenuation (timing parameters, measuring the actual velocity and drawing the decay curves compensation). The time difference positioning method is reconstructed to verify the effect of making more precise positioning accuracy, error rate of less than 5%. © 2016 Inderscience Enterprises Ltd. Source

Liu X.,Shangqiu Vocational and Technical College | Jian Z.,Henan Agricultural University | Wang J.,Henan Agricultural University | Sun S.,Henan Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

In order to explore the effective methods for degradation pesticide residue contained in fruits, an equipment for degredation of pesticide residue in fruits was developed by means of ultraviolet rays irradiating. The degradation effects of pesticide residues contained in Jonagold apple and Dangshan pear was studied with the equipment. Using ultraviolet of 253.7 nm wavelength and 2243 μW/cm2 effectual intensity to treat the apple and pear with dichlorovos, fenvalerates for 3, 2, 1 and 0.5 min separately. compared with untreated samples (taken as reference, CK), the results indicated that the pesticide residue of the treated fruits was reduced obviously. The results show that the treatment with 1 min has the best comprehensive effect which degradation rates of Dimethoate residue in the apple and pear are 57.40% and 60.12%, the degradation rates of fenvalerates are 42.23% and 41.25%. At the same time the pesticide residues in fruits are far below national standard. Source

Liu Y.,Shangqiu Vocational and Technical College
Key Engineering Materials | Year: 2010

In this article, the notion of orthogonal nonseparable four-dimensional wavelet packets, which is the generalization of orthogonal univariate wavelet packets, is introduced. A new approach for constructing them is presented by iteration method. The orthogonality properties of four-dimensional wavelet packets are discussed. Three orthogonality formulas concerning these wavelet packets are estabished. © 2010 Trans Tech Publications. Source

Cao F.,Northwest University, China | Ouyang W.,Northwest University, China | Wang Y.,Shangqiu Vocational and Technical College
Zhongguo Zhongyao Zazhi | Year: 2010

Objective: To prepare an O/W ginseng saponins-based nanoemulsion and investigate its amplified immune response. Method: The formulation of ginseng saponins-based nanoemulsion was optimized via the range of nanoemulsion zone in phase diagrams and the solubility of ginseng saponins. Its physicochemical properties were investigated, including morphology, particle size distribution, pH, viscosity and stability. Ginseng saponins-based nanoemulsion as adjuvant was co-administrated with a model antigen ovalbumin (OVA) in mice. Two weeks after the boosting, the serum levels of OVA-specific antibody and its isotypes were determined. Result: The optimized ginseng saponins-based nanoemulsion formulation consisted of ginseng saponins, IPM, Cremophor RH 40, glycerol and water (with the weight ratio of 2:4:17.8:17.8:58.4), which was a light yellow fluid. The shape of droplets was spherical under transmission electron microscopy with an average diameter of 72.20 run and a polydispersity index of 0.052. The viscosity and pH value of it were 4.20s and 6.02, respectively. And it showed good stability. When co-administered with OVA, no obvious side effects were observed in the mice immunized with ginseng saponin-based nanoemulsion. The serum levels of IgG, IgG1 and IgG2a antibody in the group of ginseng saponin-based nanoemulsion immunized mice was significantly increased compared to the groups of OVA and the saline solution of ginseng saponin. Compared with the adjuvant aluminium hydroxide, the serum levels of IgG and IgG1 antibodys in the groups of ginseng saponins-based nanoemulsion had no significant difference, but the level of IgG2a was obviously higher. Conclusion; ginseng saponin-based nanoemulsion could amplify the Th1 and Th2 immune responses, and can be used as the vaccine adjuvant. Source

Zhang J.,Nanjing Agricultural University | Zhang J.,Shangqiu Vocational and Technical College | Rui X.,Nanjing Agricultural University | Wang L.,Nanjing Agricultural University | And 2 more authors.
Food Control | Year: 2014

Quorum sensing (QS) is an intercellular signaling and gene regulatory mechanism, which is implicated in bacterial pathogenicity and food spoilage. Therefore, blocking bacterial QS system may prevent QS-controlled phenotypes responsible for food spoilage. In the present study, we aimed to investigate the anti-biofilm and quorum sensing inhibitory potentials of Rosa rugosatea polyphenol (RTP) extract, which is rich in polyphenols (87.52%) and flavonoids (61.03%). The RTP specifically inhibited QS-controlled violacein production in Chromobacterium violaceum 026 with 87.56% reduction without significantly affecting its growth. Moreover, RTP exhibited inhibition in swarming motility (84.90% and 78.03%) and biofilm formation (67.02% and 72.90%) of Escherichia coli K-12 and Pseudomonas aeruginosa PAO1 in a concentration-dependent manner, respectively. These findings strongly suggest that RTP potentially could be developed as a new QS inhibitor and/or anti-biofilm agent to enhance the shelf life and increase food safety. © 2014 Elsevier Ltd. Source

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