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17 results on '"Song, Shuzhi"'

2. Regularity of pullback attractors and equilibria for a stochastic non-autonomous reaction-diffusion equations perturbed by a multiplicative noise

Author

Zhao, Wenqiang and Song, Shuzhi

Subjects
Mathematics - Analysis of PDEs
Abstract

In this paper, a standard about the existence and upper semi-continuity of pullback attractors in the non-initial space is established for some classes of non-autonomous SPDE. This pullback attractor, which is the omega-limit set of the absorbing set constructed in the initial space, is completely determined by the asymptotic compactness of solutions in both the initial and non-initial spaces. As applications, the existences and upper semi-continuity of pullback attractors in $H^1(\mathbb{R}^N)$ are proved for stochastic non-autonomous reaction-diffusion equation driven by a multiplicative noise. Finally we show that under some additional conditions the cocycle admits a unique equilibrium., Comment: 35pages. arXiv admin note: substantial text overlap with arXiv:1411.7743

Published
2015

10. Rail crack defect recognition based on a multi-feature fusion algorithm using electromagnetic acoustic emission technique.

Author

Chang, Yongqi, Zhang, Xin, Song, Shuzhi, Song, Qinghua, and Shen, Yi

Subjects
CONVOLUTIONAL neural networks, SUPERVISED learning, ACOUSTIC emission, RECOGNITION (Psychology), FEATURE selection, FEATURE extraction
Abstract

Multi-feature fusion has been widely used to enhance recognition accuracy for different health stages of rails, which may lead to high dimensionality and information redundancy of signals. In addition, conventional supervised methods require plenty of labeled samples with class information, which can take significant time and involve high economic costs. In order to improve the effectiveness of the electromagnetic acoustic emission technique in rail crack defect recognition, a novel method including multi-feature fusion based on weakly supervised learning and recognition threshold construction is proposed in this paper. First, a mechanism consisting of multi-feature extraction and feature selection is developed to fully reflect the information of different health stages of the rail and avoid interference caused by the ineffective features. Then, the effective features and a novel weakly unsupervised label are input into the self-normalizing convolutional neural network and long short-term memory model to construct the rail health indicator (RHI). Finally, the recognition threshold is calculated based on the characteristics of the RHI to achieve crack recognition automatically. Furthermore, the experimental results under different working conditions demonstrate that the proposed method achieves a higher recognition performance than other existing methods in rail crack defect recognition. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Analysis of rockfall and its impact on the cut-and-cover tunnel in dynamics

Author

Kong Jiming（孔纪名）, Wang Chenghua（王成华）, Song Shuzhi（宋书志）, Yang Zongji, and Cheng Zefu（陈泽富）

Subjects
geography, Multidisciplinary, Rockfall, geography.geographical_feature_category, Cover (topology), Magnitude (mathematics), Limit load, Geotechnical engineering, Impact, Collision, Geology
Abstract

This paper presents the effect of thickness of Buffer layer on the safety of cut-and-cover tunnel under the given magnitude and height of rockfall, and the limit load of the structure. To establish calculating models of rockfall in different conditions, the dybamics of the fall down to the surface of the slope is taken into account and the exterior characteristics of the rockfall is analyzed. We have derived the formula for calculating velocity of rocks before and after collision, calculated the impact load upon the structures below and the limit load, and compared the impact force and limit load to judge the safety of the structure. Finally, the validity of models is approved by the safety evaluation of cut-and-cover tunnel in the mouth of Heshang Mountain in Nandan County.

Published
2006

17. Occurrence conditions and process analysis on fluidization of valley type landslide: Example of the fluidization of landslide in Qiongshan Ravine, Danba

Author

Kong Jiming, Chen Zefu, and Song Shuzhi

Subjects
geography, Multidisciplinary, geography.geographical_feature_category, Process analysis, Flow (psychology), Landslide, Fluidization, Ravine, Geomorphology, Debris flow
Abstract

A big debris flow which was arosed by landslide occurrence at night on July 11, 2003 in Qiongshan Ravine, Danba, Sichuan Province. According to the research, debris flow in Qiongshan Ravine is arosed by the fluidization of landslide. It had been rained about 70 days before debris flow occurred. That made the sediments in the gully to near to saturated or saturated in water. Being affect by the steep geography, the sediments occurrence peristalsis to transform, parts of soil bodies start disintegrate. All the sediments become transforming with water inleakaging to sediments, and than foreside slope flow to gully quickly after becoming fluidization. And the sediments come into being the debris flow with the water of the gully joining.

Published
2006

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