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	1. A HYBRID-TYPE VIBRATION ENERGY HARVESTER
	HU Junhui,LIU Pengzhan
	Engineering and Technological Science 13 June 2016
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	Abstract:In this paper, a novel hybrid-type vibration energy harvester utilizing electromagnetic induction and piezoelectricity has been presented. The device consists of one electromagnetic module and two piezoelectric modules. The electromagnetic induction module consists of two pairs of permanent magnets and one enameled copper coil. The two piezoelectric modules utilize the impact and impact-induced structural vibration, respectively.The apparent size of the device is 55mm (length)35mm(width)50mm(height). It was experimentally found that electrical power generated by the electromagnetic induction module is the maximum of the three modules, and total electrical power generated can be up to 0.23 mW when the device has a vibration amplitude of 4.5 mm and vibration frequency of 13 Hz.
	TO cite this article:HU Junhui,LIU Pengzhan. A HYBRID-TYPE VIBRATION ENERGY HARVESTER[OL].[13 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4697908


	2. Edge preserving filtering of micro-structured surfaces
	ZHANG Xiangchao,Xu Min
	Engineering and Technological Science 28 May 2013
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	Abstract:Micro optical elements are more and more widely used in precision engineering. Characterisation of the surface topography of these surfaces is very difficult due to the existence of sharp edges and complex features. The Gaussian filter will ruin the sharp features of structured surfaces. In this paper a Gaussian bilateral filter is developed. It uses two kernel functions. When implementing filtering, the weights of the neighbouring data points are assigned not only based on the spatial closeness, but also according to the signal similarity. Thus at the regions of sharp edges, large weighting values are assigned only to the data points that are similar to the current data values, and the sharp features can be preserved successfully. Numerical validations are presented to compare the behaviours of conventional Gaussian filter and the bilateral filter. The results demonstrated that the developed Gaussian bilateral filter shows remarkable superiority on filtering non-smooth micro-structured surfaces.
	TO cite this article:ZHANG Xiangchao,Xu Min. Edge preserving filtering of micro-structured surfaces[OL].[28 May 2013] http://en.paper.edu.cn/en_releasepaper/content/4545572


	3. Low-temperature growth of highly c-oriented GaN films on Ag substrates with ECR-PEMOCVD
	WANG Shuai,QIN Fuwen
	Engineering and Technological Science 01 April 2013
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	Abstract:Highly-preferred GaN films are deposited on Ag prepared on siliconchip substrates using the electron cyclotron resonance plasma enhanced metal organic chemical vapor deposition (ECR-PEMOCVD). Trimethylgallium (TMGa) and N2 are employed as the source of Ga and N, respectively, and high purity H2 is used as carrier gas. The effect of deposition temperature on the as-grown GaN films is systematically investigated by in-situ reflection high energy electron diffraction(RHEED), x-ray diffraction(XRD) and scanning electron microscope(SEM). The results show that high-quality GaN films with high preferred orientation and smooth surface were successfully achieved on Ag at the proper deposition temperature of 485℃.
	TO cite this article:WANG Shuai,QIN Fuwen. Low-temperature growth of highly c-oriented GaN films on Ag substrates with ECR-PEMOCVD[OL].[ 1 April 2013] http://en.paper.edu.cn/en_releasepaper/content/4531543


	4. Modeling rockfall process using numerical manifold method and discontinuous deformation analysis
	Ning Youjun,An Xinmei,Lü Qing,Ma Guowei
	Engineering and Technological Science 24 December 2012
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	Abstract:The recently developed numerical manifold method (NMM) provides a promising technology for modeling whole rockfall process, involving opening/sliding of pre-existing discontinuities, fracturing in intact rock bridges to form persistent failure surfaces and subsequent motions of the generated rock blocks. However, the NMM suffers one limitation, i.e., unexpected material domain area change occurs in rotation modelling. This problem cannot be easily solved because the rigid body rotation is not represented explicitly in NMM. The discontinuous deformation analysis (DDA) is specially developed for modeling discrete block systems. The rotation-induced material area change in DDA models can be avoided conveniently since the rigid body rotation is represented in an explicit form. In this paper, a transition technique is proposed and implemented to convert a NMM model to a DDA model so as to simulate whole rockfall process entirely by means of above two methods, in which NMM is adopted to model the early fracturing as well as the transition from continua to discontinua, while DDA is adopted to model the subsequent motion of the generated rock blocks. Such a numerical approach also improves the simulation efficiency greatly compared with a single NMM approach. The fracturing of a rock slab with pre-existing non-persistent joints located on a slope crest and the induced rockfall process are simulated. The validity of the modeling transition from NMM to DDA is verified and the applicability of the proposed numerical approach is illustrated.
	TO cite this article:Ning Youjun,An Xinmei,Lü Qing, et al. Modeling rockfall process using numerical manifold method and discontinuous deformation analysis[OL].[24 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4505044


	5. Correction Factors of the Mindlin Plate Equations with the Consideration of Electrodes
	Du Jianke,CHEN Guijia,WANG Wenjun,WU Rongxing,MA Tingfeng,WANG Ji
	Engineering and Technological Science 09 April 2012
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	Abstract:The Mindlin plate theory has been playing a role vital in the analysis of high frequency vibrations of quartz crystal resonators at the thickness-shear mode. The coupled equations with infinite number of vibration modes have been truncated to retain essential ones with strong couplings for simplified analysis, and correction factors have been introduced to ensure exact solutions at cut-off frequencies as part of the validation procedure. Starting form plates without complications, correction factors have also been modified to include electrodes for their mass effect. Such results have been important to higher-order correction factors to ensure accurate consideration of electrodes in the AT-cut quartz crystal plates. The findings in factors systematic study are readily available for the analytical equations with selected modes with strong couplings, and equally convenient for the implementation of the finite element analysis with the Mindlin plate equations.
	TO cite this article:Du Jianke,CHEN Guijia,WANG Wenjun, et al. Correction Factors of the Mindlin Plate Equations with the Consideration of Electrodes[OL].[ 9 April 2012] http://en.paper.edu.cn/en_releasepaper/content/4474774

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