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Fire Burning Characteristics, Attacking Techniques and Safety Precautions in Pinus pumila Scrubs
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作者 king Techniques and Safety Precautions in Pinus pumila ScrubsZHAO Fengjun1 DU Jianhua2 SHU Lifu1 1. Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry Key Open Laboratory of Forest Protection, State Forestry Administration, Beijing 100091, P.R.China 2. Forest Fire Management Office, State Forestry Administration, Beijing 100714, P.R.China 《Chinese Forestry Science and Technology》 2010年第1期67-73,共7页
In China, Pinus pumila is mainly distributed in Daxing’anling, while those growing in the eastern Daxing’anling are primarily covered under the jurisdiction of Huzhong Forest Bureau. P. pumila is an evergreen shrub,... In China, Pinus pumila is mainly distributed in Daxing’anling, while those growing in the eastern Daxing’anling are primarily covered under the jurisdiction of Huzhong Forest Bureau. P. pumila is an evergreen shrub, 3-6 m high, and always grows vigorously. Its trunks creep along the ground, usually 10 m long or more. It is easily flammable because of the large amounts of resins and volatile oils in its body. Attacking forest fires is a dangerous work, especially in P. pumila scrubs. The fires in P. pumila scrubs are very different from those in other forest types, e.g. fierce combustion and heavy smoke. In this paper, the distribution characteristics of P. pumila scrubs were presented. Attacking techniques and safety precautions for attacking fires in P. pumila scrubs were also discussed. 展开更多
关键词 Pinus pumila forest fire attacking technique safety precaution
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Application of a Support Vector Machine Algorithm to the Safety Precaution Technique of Medium-low Pressure Gas Regulators 被引量:5
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作者 HAO Xuejun AN Xaioran +1 位作者 WU BO HE Shaoping 《Journal of Thermal Science》 SCIE EI CAS CSCD 2018年第1期74-77,共4页
In the gas pipeline system, safe operation of a gas regulator determines the stability of the fuel gas supply, and the medium-low pressure gas regulator of the safety precaution system is not perfect at the present st... In the gas pipeline system, safe operation of a gas regulator determines the stability of the fuel gas supply, and the medium-low pressure gas regulator of the safety precaution system is not perfect at the present stage in the Bei- jing Gas Cxroup; therefore, safety precaution technique optimization has important social and economic signific- ance, In this paper, according to the running status of the medium-low pressure gas regulator in the SCADA sys- tem, a new method for gas regulator safety precaution based on the support vector machine (SVM) is presented. This method takes the gas regulator outlet pressure data as input variables of the SVM model, the fault categories and degree as output variables, which will effectively enhance the precaution accuracy as well as save significant manpower and material resources. 展开更多
关键词 gas regular fault diagnosis safety precaution SVM parameter optimization
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Research on Online Safety Precaution Technology of a High-medium Pressure Gas Regulator 被引量:2
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作者 HAO Xuejun LIU Xuhai +1 位作者 LI Xiaxi ZHAO Xin 《Journal of Thermal Science》 SCIE EI CAS CSCD 2017年第3期229-234,共6页
In view of some of the characteristics of a high-medium pressure gas regulator, such as small fault samples, many fault types and complex fault features etc, in order to improve the accuracy of fault precaution in thi... In view of some of the characteristics of a high-medium pressure gas regulator, such as small fault samples, many fault types and complex fault features etc, in order to improve the accuracy of fault precaution in this paper, a fault diagnosis method based on the combination of the improved wavelet packet and pressure harmonic distortion rate is proposed. On the basis of the harmonic distortion rate of the outlet pressure and the energy value of each frequency band obtained by improved wavelet packet decomposition, the rules for fault data were summarized. Finally, a safety precaution model of the high-medium pressure gas regulator is established. 展开更多
关键词 high-medium pressure gas regulator improved wavelet packet harmonic distortion rate safety precaution model
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