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27 results on '"Li, Guangqiang"'

13. Microstructure and Magnetic Properties of Fe/ZrSiO4 Composites Prepared by Mechanical Milling and Spark Plasma Sintering.

Author

Hu, Wentao, Fan, Xi'an, Luo, Zigui, Luo, Fan, Li, Guangqiang, Li, Yawei, and Wang, Jian

Subjects
MECHANICAL alloying, MAGNETIC properties, MAGNETIC permeability, MAGNETIC structure, SINTERING, MILLING (Metalwork)
Abstract

Fe/ZrSiO4 composite compacts with high thermal stability and excellent soft magnetic performance were prepared successfully by mechanical milling and spark plasma sintering. The effect of ZrSiO4 content on microstructure and magnetic properties of the Fe/ZrSiO4 composite compacts was investigated in detail. ZrSiO4 could be coated uniformly on the surface of Fe particles. With the increasing ZrSiO4 content, the core losses are effectively reduced, but the effective permeability and the saturation magnetic magnetization gradually decrease, while the coercivity has shown the opposite trend accordingly. The composite compact with 7.5 wt% ZrSiO4 has shown the superior structure and soft magnetic properties such as high saturation magnetic magnetization (202.20 emu/g), stable effective magnetic permeability (29.39), and lower core loss (4.53 W $\cdot $ kg−1 at 5 kHz). The results indicated that the Fe/ZrSiO4 composite compacts had potential application prospects in electromagnetic conversion equipment at medium and high frequencies. [ABSTRACT FROM AUTHOR]

Published
2019
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17. Research on remote EMC testing system

Author

Xiaoyong Lei, Jia Mingjie, Liu Shanghe, and Li Guangqiang

Subjects
Engineering, Instrument control, Electromagnetics, ComputingMilieux_THECOMPUTINGPROFESSION, Virtual instrumentation, business.industry, Electromagnetic compatibility, System testing, Data acquisition, Embedded system, Systems engineering, business, Virtual network, Test data
Abstract

With quick development and use of microelectronic technique in modern industry, EMC problems of equipments become more and more complex. In order to satisfy quick testing requirement, the paper presents an architecture for remote EMC testing system. The system integrates virtual instrument and network technique for real-time data acquisition, transmission and instrument control. Its distributed structure, providing testing data for different experts far from equipment under test, is undoubtedly beneficial for solving EMC problems in time.

Published
2009

18. Model Based SAR Image Segmentation

Author

Sheng Wen and Li Guangqiang

Subjects
Contextual image classification, Computer science, Segmentation-based object categorization, business.industry, Feature extraction, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Scale-space segmentation, Pattern recognition, Image segmentation, Computer Science::Graphics, Image texture, Feature (computer vision), Computer Science::Computer Vision and Pattern Recognition, Computer vision, Segmentation, Artificial intelligence, business
Abstract

This paper presents a SAR image segmentation approach based on Gauss-Markov random field (GMRF) model. SAR images can be considered as they are composed of different textures, and image segmentation is directly implemented by texture segmentation approaches. Because of the better capability of texture discrimination, GMRF model is employed here to classify textures and the least error estimation is used for the solution of model parameters, and the Euclidean distance approach is employed to classify different features. In order to improve the local discrimination capability, the local energy feature is introduced. From classified textures, different region boundaries can be obtained. Experiments show that this approach has distinct global feature as well as local one for image segmentation compared with traditional approaches

Published
2006

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