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93 results on '"Tang, Yunchao"'

58. Combined effects of nano-silica and silica fume on the mechanical behavior of recycled aggregate concrete

Author

Chen Jieming, Tang Yunchao, Chen Zheng, Li Cong, Nong Yumei, and Feng Wanhui

Subjects
Technology, Materials science, Aggregate (composite), Silica fume, silica fume, Process Chemistry and Technology, Chemical technology, Physical and theoretical chemistry, QD450-801, Energy Engineering and Power Technology, Medicine (miscellaneous), nano-silica, TP1-1185, Surfaces, Coatings and Films, Biomaterials, microstructure analysis, Nano, mechanical behavior, Composite material, recycled aggregate concrete, Biotechnology
Abstract

Recycled aggregate concrete (RAC) is an environmentally friendly material. However, owing to inherent characteristics of the recycled aggregate (RA), it is difficult to promote and apply it in structural engineering. Silica fume (SF) and nano-silica (NS) have different characteristics as additives for RAC. It has been proven that adding SF only enhances the strength of RAC at a later stage, and NS can improve the early strength of RAC owing to its high pozzolanic activity. In this study, to further improve the properties of RAC, two types of additives were combined into RAC, which was named SF-NS-modified RAC (SSRAC). Compression and split tensile tests were conducted to analyze the mechanical properties of SSRAC at different curing ages. The results indicated that the combined addition of NS and SF improved the performance of RAC at early and later curing ages. Scanning electron microscopy and X-ray diffraction analyses were performed to explore the NS and SF mechanism. The results indicated that SF and NS in SSRAC had a good pozzolanic effect and underwent a secondary hydration reaction with calcium hydroxide to increase the production of calcium silicate hydrate, resulting in an increase in the properties of the interface transition zone. Finally, 6% SF and 2 or 3% NS are recommended as supplementary cementitious materials for RAC.

Published
2021

69. Grand Challenges of Machine-Vision Technology in Civil Structural Health Monitoring

Author

Lin Yunfan, Minghui Yao, Zou Xiangjun, Xueyu Huang, Tang Yunchao, and Huang Zhaofeng

Subjects
Engineering management, Engineering, Machine vision, business.industry, Deep learning, General Medicine, Artificial intelligence, Structural health monitoring, business, Civil infrastructure, Condition assessment, Grand Challenges, Computer technology
Abstract

Machine-vision technology has progressed remarkably in both accuracy and speed owing to advances in computer technology and artificial intelligence. In this paper, state-of-the-art research on vision-based techniques is reviewed for civil infrastructure condition assessment. The major challenges of machine vision technique in civil structural health monitoring are presented.

Published
2020

75. 基于主干双尺度特征融合的裂缝宽度视觉测量

Author

黄钊丰 Huang Zhaofeng, 唐昀超 Tang Yunchao, 邹湘军 Zou Xiangjun, 陈明猷 Chen Mingyou, 周浩 Zhou Hao, and 邹天龙 Zou Tianlong

Subjects
Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics
Published
2022

85. A Vision-Based Algorithm for Deformation of Steel Pipe Column Detection

Author

Chenglin Wang, Feng Wenxian, Wei-ming Situ, Yu-da Mo, Tang Yunchao, Jin-hui Li, and Xiangjun Zou

Subjects
Vision based, Computer science, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Process (computing), Image processing, Deformation (meteorology), Column (database), Algorithm, Edge detection, Bridge (nautical), Image (mathematics)
Abstract

It has great significance for assessing the safety of engineering structures or the bridge by detecting Deformation of steel pipe column. The manual contact measurement is one of the traditional methods to detect the deformation of the steel pipe column. However, in the actual operation environment, the manual contact measurement is difficult and there are some hidden safety problems in the measurement process, thus it is particularly important to study a non-contact measurement method of the steel pipe column. Image processing is one of the common methods of non-contact measurement. In this paper, with the same steel pipe deformation image, respectively, using different edge detection algorithm, comparative analysis of the result, it come to a conclusion that the most suitable algorithm is Canny algorithm, and it is a classic algorithm of edge detection which has been applied in image processing. However, the traditional Canny algorithm has some defects, such as difficulty in threshold setting, low efficiency. Based on traditional Canny algorithm to improve it, this paper proposes an improved custom threshold Canny algorithm. The results show that the method proposed in this paper, the method of which is more than the traditional detection method to save at least 0.8s. Basically meet the requirements of real-time detection of stable and reliable, fast, high accuracy, and has a certain practicality.

Published
2017

91. Three-dimensional Date Reconstruction and Navigation of Complex Scene in Virtual Environment

Author

Tang Yunchao, Zou Xiang-Jun, Chen Yan, Sun Shuang, Meng Qing-Guo, and Luo Lufeng

Subjects
Image fusion, Carving, business.industry, Computer science, 3D reconstruction, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Navigation system, Solid modeling, Iterative reconstruction, Virtual reality, Data modeling, Image texture, Computer graphics (images), Computer vision, Artificial intelligence, Geometric modeling, business, Texture mapping, ComputingMethodologies_COMPUTERGRAPHICS
Abstract

This Targeting to the complexity and large amount of 3D(three-dimensional) reconstruction of complex scene in virtual environment, Firstly, The 3D data acquisition and conversion principle, scene modeling and texture mapping method were described. Secondly, the geometric modeling and image fusion method was presented. Thirdly, the reconstruction mathematical model of image based on entropy variation were introduced, and then data compression algorithm to reduce the number of the entity grid was given. Besides, the intricate and fine animal wood carving model on the roof was an example, which was optimized and reconstructed. At last, a classical Chinese architecture was used as a prototype for the fusion modeling and optimization, and merging with virtual software a 3D reconstruction of classical architecture and the scene Navigation system in virtual environment was developed with VC++.

Published
2010

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