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Xiong Y.,PLA University of Science and Technology | Yang X.,PLA Institute of Engineer Corps
Journal of Theoretical and Applied Information Technology | Year: 2012

The electrical system of the construction machinery usually works on circumstance of high temperature, serious vibration and shock, dust pollution as well as electromagnetic interference, so the electrical system is very likely to go wrong while compared with other systems, for example working attachment, under chassis and so on. In view of this, an advanced fault test device, with application of embedded equipment and virtual technology, is developed in this work. The function and implementation of software are illustrated. The device is composed of PDA, cradle and CF-bus data acquisition card. It can test and diagnose the circuit and electronic component fault. Furthermore it stores the data and upload data to server simultaneously for further diagnosis and processing of repair and maintenance expert. The fault test device may be utilized in fault diagnosis of electrical system and components of engineering vehicles, subsequently improve the maintenance and diagnosis capability for the electrical system. © 2005 - 2012 JATIT & LLS. All rights reserved. Source

Zhang N.,PLA Institute of Engineer Corps | Yu J.,PLA Institute of Engineer Corps | Cai S.,PLA Institute of Engineer Corps
Applied Mechanics and Materials | Year: 2012

A series of temperature- and pH-responsive poly(vinyl alcohol)/poly(N, N-diethylacrylamide-co-methacrylic acid) PVA/P(DEA-co-MAA) intelligent semi-IPN hydrogels were synthesized by free-radical copolymerization techniques and semi-interpenetrating polymer network techniques. The effects of the feed components, temperature and pH on the swelling behavior of the hydrogels were studied in detail. This unique property makes them very useful for biomedical applications such as on-off switches for modulated drug delivery and tissue engineering. With the increase of PVA content, the thermo- and pH-responsive of the semi-IPN hydrogel improved. © (2012) Trans Tech Publications. Source

Zhang N.,Lanzhou University | Zhang N.,PLA Institute of Engineer Corps | Shen Y.,PLA Institute of Engineer Corps | Li X.,PLA Institute of Engineer Corps | And 2 more authors.
Biomedical Materials | Year: 2012

In this paper, a series of thermo- and pH-sensitive poly(vinyl alcohol)/poly(N, N-diethylacrylamide-co-itaconic acid) (PVA/P(DEA-co-IA)) semi-interpenetrating polymer network (semi-IPN) hydrogels were synthesized by radical polymerization and semi-IPN technology. The influence of PVA on the property of resulting PVA/P(DEA-co-IA) (PVA/PDI) semi-IPN hydrogels was investigated and characterized. The interior morphology observed by scanning electron microscopy (SEM) revealed that freeze-dried semi-IPN hydrogels had small pore size and interconnected porous network structures. X-ray diffraction (XRD) studies showed that a sharp characteristic peak of PVA in semi-IPN hydrogel could be observed at about 2θ = 20°. The incorporation of PVA decreased the equilibrium swelling ratio of modified hydrogels when compared with a usual PDI hydrogel. The semi-IPN hydrogels exhibited unconventional thermosensitive characteristics, such as faster deswelling rates and slower swelling rates in response to temperature change, and excellent mutative values in response to an alternation of the pH value, the changing degree of which depended on the PVA content. The release behaviors of the model drug, aminophylline, were found to be dependent on hydrogel compositions and the environmental temperature. Compared with the usual PDI hydrogel, the drug release rate of the semi-IPN hydrogel is slower, which could be expected to be useful in the biomedical and biotechnology fields. © 2012 IOP Publishing Ltd. Source

Li X.Q.,PLA Institute of Engineer Corps | Zhang N.Y.,PLA Institute of Engineer Corps | Li Y.X.,PLA Institute of Engineer Corps | Li H.J.,PLA Institute of Engineer Corps
Advanced Materials Research | Year: 2013

A series of semi-interpenetrating polymer materials of poly(vinyl alcohol)/poly(N, N-diethylacrylamide-co-methacrylic acid)(PVA/PDM) were synthesized by free radical copolymerization techniques and semi-interpenetrating polymer network techniques at room temperature with ammonium persulfate and N,N,N',N'-tetramethylethylene diamide as initiators and N,N'-methylenebisacrylamide as a crosslinker. The interior morphology by scanning electron microscopy (SEM) revealed that PVA introduced PDM materials have interconnected porous network structures. The release behaviors of the model drug, aminophylline, are found dependent on material composition and environmental temperature, which suggests that these materials have potential application as intelligent release carriers. © (2013) Trans Tech Publications, Switzerland. Source

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