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The motion analysis of fire video images based on moment features and flicker frequency 被引量:9
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作者 LIJin FONG +3 位作者 N.K.,CHOW W.K.,WONG L.T.,LUPuyi XUDian-guo 《Journal of Marine Science and Application》 2004年第1期81-86,共6页
In this paper, motion analysis methods based on the moment features and flicker frequency features for early fire flame from ordinary CCD video camera were proposed, and in order to describe the changing of flame and ... In this paper, motion analysis methods based on the moment features and flicker frequency features for early fire flame from ordinary CCD video camera were proposed, and in order to describe the changing of flame and disturbance of non-flame phenomena further more, the average changing pixel number of the first-order moments of consecutive flames has been defined in the moment analysis as well. The first-order moments of all kinds of flames used in our experiments present irregularly flickering, and their average changing pixel numbers of first-order moments are greater than fire-like disturbances. For the analysis of flicker frequency of flame, which is extracted and calculated in spatial domain, and therefore it is computational simple and fast. The method of extracting flicker frequency from video images is not affected by the catalogues of combustion material and distance. In experiments, we adopted two kinds of flames, i. e. , fixed flame and movable flame. Many comparing and disturbing experiments were done and verified that the methods can be used as criteria for early fire detection. 展开更多
关键词 fire video images moment features flicker frequency
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A novel sliding mode nonlinear proportional-integral control scheme for controlling chaos 被引量:6
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作者 禹东川 吴爱国 杨朝萍 《Chinese Physics B》 SCIE EI CAS CSCD 2005年第5期914-921,共8页
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DC Insulation Parameter Characteristics of XLPE in the Course of Its Aging
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作者 WANGHong-xin CHENGShu-kang +2 位作者 WENXi-shan YAOHong-yu CHENYun-ping 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第2期421-425,共5页
This paper deals with the experimental study on the correlation betweeninsulation resistance (R) and direct current (DC) component (i_(de)) and corresponding aging degreeof insulation in the course of the aging within... This paper deals with the experimental study on the correlation betweeninsulation resistance (R) and direct current (DC) component (i_(de)) and corresponding aging degreeof insulation in the course of the aging within cross linked polyethylene (XLPE) insulation. Theaging tests were performed on a section of 10 kV transmission XLPE cable by means of water needlemethod, and _R was measured by DC voltage superimposed method, R and i_(de) were found to besignificantly dependent on the correspondingaging degree of insulation in the course of aging ofXLPE, and different kind of aging stage has different characteristics. Beside, there are generallysimilar regularity but different amplitude in the course of aging of XLPE insulation in differentelectrolyte, and the various electrochemical tree were found on the surface of aging XLPE cableimmersed in CuSO_4, solution. Therefore, according to the changing regularity of the DCcharacteristic parameters i. e. R and i_(de) within XLPE insulation judging the aging degree of XLPEinsulation will be an effective method. 展开更多
关键词 XLPE AGING insulation resistance DC component
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Multi-Scale Time Asymmetry for Detecting the Breakage of Slug Flow Structure
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作者 郝庆阳 金宁德 +2 位作者 韩云峰 高忠科 翟路生 《Chinese Physics Letters》 SCIE CAS CSCD 2014年第12期6-10,共5页
Gas-liquid two-phase slug exist in numerous industrial flow phenomena widely processes and practical applications. Furthermore, heat and mass transfer rates, pressure prediction and momentum loss greatly depend on the... Gas-liquid two-phase slug exist in numerous industrial flow phenomena widely processes and practical applications. Furthermore, heat and mass transfer rates, pressure prediction and momentum loss greatly depend on the slug flow structure. Hence, the study of slug flow has attracted considerable research inter- est. Meanwhile, uncovering the dynamic behaviors and flow structure of slug flow has also become a sig- nificant problem, especially for the measurement of two-phase flow parameters. 展开更多
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