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Effects of Specimen Height on the Acoustic Emission Rate Value 'a' for Cement Mortar 被引量:1
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作者 王岩 HU Hongxiang +3 位作者 LU Guijuan CHEN Shijie LIU Shaojun WANG Yao 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第4期843-850,共8页
In order to study the size effect on the AE rate ’a’ value,three kinds of mix ratios were set up by different particle sizes and water cement ratios,45 cement mortar specimens with five different heights were tested... In order to study the size effect on the AE rate ’a’ value,three kinds of mix ratios were set up by different particle sizes and water cement ratios,45 cement mortar specimens with five different heights were tested under axial compression.And the whole damage processes were monitored by full-digital acoustic emission acquisition system,followed by an analysis of mechanical behavior and AE activity.The experimental results show that the height of the cement specimen has significant effects on the compressive strength and the acoustic emission rate ’a’ value,but a slight effect on the accumulated AE hits number,which is analyzed from aspects of failure process of cement mortar specimens. 展开更多
关键词 mortar compressive specimen accumulated sizes monitored deterioration penetration slight automatically
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Adaptive Local Linear Quantile Regression 被引量:1
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作者 Yu-nan Su Mao-zai Tian 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2011年第3期509-516,共8页
In this paper we propose a new method of local linear adaptive smoothing for nonparametric conditional quantile regression. Some theoretical properties of the procedure are investigated. Then we demonstrate the perfor... In this paper we propose a new method of local linear adaptive smoothing for nonparametric conditional quantile regression. Some theoretical properties of the procedure are investigated. Then we demonstrate the performance of the method on a simulated example and compare it with other methods. The simulation results demonstrate a reasonable performance of our method proposed especially in situations when the underlying image is piecewise linear or can be approximated by such images. Generally speaking, our method outperforms most other existing methods in the sense of the mean square estimation (MSE) and mean absolute estimation (MAE) criteria. The procedure is very stable with respect to increasing noise level and the algorithm can be easily applied to higher dimensional situations. 展开更多
关键词 quantile regression local linear regression adaptive smoothing automatic choice of window size ROBUSTNESS
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On-line full scan inspection of particle size and shape using digital image processing 被引量:10
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作者 Chih-Wei Liao Jiun-Hung Yu Yeong-Shin Tarng 《Particuology》 SCIE EI CAS CSCD 2010年第3期286-292,共7页
An on-line full scan inspection system is developed for particle size analysis. A particle image is first obtained through optical line scan technology and is then analyzed using digital image processing. The system i... An on-line full scan inspection system is developed for particle size analysis. A particle image is first obtained through optical line scan technology and is then analyzed using digital image processing. The system is composed of a particle separation module, an image acquisition module, an image processing module, and an electric control module. Experiments are carried out using non-uniform 0.1 mm particles. The main advantage of this system consists of a full analysis of particles without any overlap or miss, thus improving the Area Scan Charge Coupled Device (CCD) acquisition problems. Particle size distribution, roundness, and sphericity can be obtained using the system with a deviation of repeated precision of around ±1%. The developed system is shown to be also convenient and versatile for any particle size and shape for academic and industrial users. 展开更多
关键词 Particle size distribution Particle characterization Image analysis Line scan CCD automatic inspection
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