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Improved Bacterial Foraging Optimization Algorithm Based on Fuzzy Control Rule Base

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Journal of Electronic Science and Technology 2017年第3期15卷 283-288页

作者： cui-cui du Xu-Gang Feng Jia-Yan Zhang School of Electrical and Information Engineering Anhui University of Technology Maanshan 243002

Manual construction of a rule base for a fuzzy system is the hard and time-consuming task that requires expert *** this paper we proposed a method based on improved bacterial foraging optimization（IBFO）,which simulates the foraging behavior of “***” bacterium,to tune the Gaussian membership functions parameters of an improved Takagi-Sugeno-Kang fuzzy system（C-ITSKFS） rule *** remove the defect of the low rate of convergence and prematurity,three modifications were produced to the standard bacterial foraging optimization（BFO）.As for the low accuracy of finding out all optimal solutions with multi-method functions,the IBFO was *** order to demonstrate the performance of the proposed IBFO,multiple comparisons were made among the BFO,particle swarm optimization（PSO）,and IBFO by MATLAB *** simulation results show that the IBFO has a superior performance.

关键词： Index Terms--Fuzzy control system Gaussian membership functions improved bacterial foraging optimization (IBFO) particle swarm optimization (PSO)

Velocity profile of debris flow based on quadratic rheology model

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Journal of Mountain Science 2021年第8期18卷 2120-2129页

作者： du cui WU Wei-ming MA Chao School of Civil Engineering Henan University of Science and TechnologyLuoyang471000China Department of Civil and Environmental Engineering Clarkson UniversityNew York13699USA School of Soil and Water Conservation Beijing Forestry UniversityBeijing100083China

The quadratic rheology model considers the yield stress,viscous stress,turbulent stress and disperse stress,so it is used in this study to derive the velocity profile of debris *** quadratic model with the parabolic eddy viscosity was numerically solved,and an analytical solution was derived for the quadratic model with a constant eddy *** two solutions were compared with the Arai-Takahashi model that excluded the viscous stress and the yield *** three models were tested by using 17 experiment cases of debris flows over rigid *** results prove that the quadratic model with parabolic and constant eddy viscosities is applicable to muddy and granular flows,whereas the Arai-Takahashi model tends to overestimate the flow velocity near the water surface if a plug-like layer *** addition,the von Karman constant and the zero-velocity elevation in the three models are related to sediment *** von Karman constant decreases first and then increases as the sediment concentration *** zero-velocity elevation is below the bed surface,likely due to the invalidity of the non-slip boundary condition for the debris flows over fixed beds.

关键词： Debris flow Velocity profile Parabolic model von Karman constant

Comparison of the entrainment rate of debris flows in distinctive triggering conditions

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Journal of Mountain Science 2017年第2期14卷 237-248页

作者： MA Chao WANG Yu-Jie du cui Key Laboratory of State Forestry Administration on Soil and Water Conservation Beijing Forestry University School of civil engineering Henan University of Science and Technology

Debris flows can be extremely destructive because they can increase in magnitude via progressive entrainment. In this paper, a total of 18landslide-type debris flows and 268 channelized debris flows in Wenchuan earthquake and Taiwan region, as well as other regions were collected to analyze the entrainment rate of debris flows in each triggering condition. Results show that there is a power relationship between volume of initial triggered mass and final deposited debris for landslide type debris flow. The debris flows during2008 and 2013 in Wenchuan earthquake-region have smaller entrainment rate than that from 2001 t02009 in Taiwan. The entrainment rate of debris flow events from 2001 to 2009 in Taiwan shows a decaying tendency as elapsed time. Comparison of the entrainment rate in the two earthquake-hit regions with other regions proves that entrainment rate has a close relation with major sediment availability and secondary rainstorm conditions.

关键词： Debris flows Landslide Magnitude Entrainment rate Earthquake

Effect of Environmental Factors on Electrochemical Behavior of X70 Pipeline Steel in Simulated Soil Solution

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Journal of Iron and Steel Research International 2009年第6期16卷 52-57页

作者： ZHANG Liang LI Xiao-gang du cui-wei School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Potentiodynamic polarization measurement was used to investigate the effects of temperature, dissolved ox- ygen concentration and pH on the electrochemical behavior of X70 pipeline steel in simulated solution according to the orthogonal testing method. The results showed that temperature, dissolved oxygen concentration and pH had great influence on corrosion current density （icorr） of X70 steel. Corrosion current density of X70 steel was most influenced by dissolved oxygen concentration in simulated solution. The corrosion degree of X70 steel was the least under the environment of low temperature, deficient oxygen and weak acid.

关键词： X70 pipeline steel potentiodynamic polarization measurement orthogonal testing corrosion current density

United membrane biological reactor in the treatment of wastewater

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Journal of Environmental Sciences 2003年第5期15卷 652-661页

作者： ZHOU Ji ti YAN Bin du cui hong DONG Xiao li Environmental Engineering Institute Dalian University of TechnologyDalian 116012China. Dalian Institute of Light Industry Dalian 116034China

The united membrane biological reactor(UMBR) was studied for the treatment of some simulate and municipal wastewater. The removal efficiency for COD and turbidity are greater than 80% and 99% respectively. Effluent COD is less than 100 mg/L while turbidity less than 5 The removal of LAS in bath wastewater is greater than 70%. In treatment of dinning hall wastewater, removal of fatty oil is greater than 90%, and its concentration in effluent is less than 5 mg/L. The match of biological reactor and the membrane separation component were calculated. The stable performance of wastewater treatment can be maintained by the optimization of operation conditions and the cleanout of membranes.

关键词： membrane biological reactor wastewater treatment

Effects of seismic surge waves and implications for moraine-dammed lake outburst

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Frontiers of Earth Science 2016年第3期10卷 570-577页

作者： cui du Lingkan YAO Yidan HUANG Jiahong YAN Subhashsagar SHAKYA MOE Key Laboratory of High-speed Railway Engineering Southwest Jiaotong University Chengdu 610031 China Road and Railway Engineering Research Institute Sichuan Key Laboratory of Aseismic Engineering and Technology Chengdu 610031 China School of Civil Engineering Henan University of Science and Technology Luoyang 471023 China

Moraine dams usually collapse due to over- topping by the surge wave in the dammed lake, and the surge wave is most likely caused by an earthquake. The seismic water wave （SWW） is a major factor causing the dam to break in the earthquake zone. This paper focused on the SWW by model experiments with a shaking water tank under conditions of various water depths, seismic waves, and peak ground accelerations. Two empirical equations were obtained for estimating maximal wave height for the low and high frequency, respectively. Finally, we present the application of the empirical equations on Midui Glacier Lake in Tibet plateau.

关键词： seismic water wave shaking water tankexperiment seismic wave moraine-dammed lake outburst

Determination of the critical rainfall of runoff-initiated debris flows by the perspective of physical mechanics and Shields stress

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Journal of Mountain Science 2024年第4期21卷 1160-1173页

作者： MA Chao ZHU Yongtai LU Lu du cui LYU Liqun DONG Jie School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China Beijing Institute of Geological Hazard Prevention Beijing 100120China School of Software Engineering Chengdu University of Information TechnologyChengdu610225China Civil and Environmental Engineering Department Clarkson UniversityNY 13699USA

The critical rainfall of runoff-initiated debris flows is utmost importance for local early hazard *** paper presents research on the critical rainfall of runoff-initiated debris flows through comparisons between slope gradients and three key factors,including topographic contributing area,dimensionless discharge,and Shields *** rainfall amount was estimated by utilizing in-situ rainfall records and a slope-dependent Shields stress model was *** created model can predict critical Shields stress more accurately than the other two ***,a new dimensionless discharge equation was proposed based on the corresponding discharge-gradient *** new equation,along with factors such as contributing area above bed failure sites,channel width,and mean diameter of debris flow deposits,predicts a smaller rainfall amount than the in-situ measured *** the slope-dependent Shields stress model performs well and the estimated rainfall amount is lower than the in-situ records,the sediment initiation in the experiments falls within sheet flow regime due to a large Shields ***,further sediment initiation experiments at a steeper slope range are expected in the future to ensure that the sediment transport belongs to mass failure regime characterized by a low level of Shields ***,a more accurate hazard forecast on the runoff-initiated debris flow holds promise when the corresponding critical slope-dependent dimensionless discharge of no motion,fluvial sediment transport,mass flow regime,and sheet flow regime are considered.

关键词： Infinite slope stability Shields stress Contributing area-slope gradient Rainfall back estimation

Research on the cutting force of a pick

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Mining Science and Technology 2009年第4期19卷 514-517页

作者： LIU Song-yong du Chang-long cui Xin-xia School of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Cutting tests were done using a test bed designed to measure pick cutting forces when cutting coal and *** test equipment has a drum with two starting helical *** forces on a pick were measured as a function of coal compressive strength,pick carbide tip diameter and the cutting depth per drum *** results show that the cutting force is linearly related to the compressive *** relationship between the cutting force and both the carbide tip diameter and the cutting depth are *** in the cutting force does not increase with coal compressive strength but it has a linear relationship to tip diameter.A plot of cutting force fluctuations versus the cutting depth follows a sigmoidal *** on the analysis of these test results a theoretical basis is supplied for design and effective use of shearer drums.

关键词： pick cutting force shearer cutting theory carbide tip diameter cutting depth

Damming of Large River by Debris Flow: Dynamic Process and Particle Composition

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Journal of Mountain Science 2014年第3期11卷 634-643页

作者： du cui YAO Ling-kan SHAKYA Subhashsagar LI Lun-gui SUN Xiao-dan School of Civil Engineering Southwest Jiaotong University MOE Key Laboratory of High-speed Railway Engineering Southwest Jiaotong University Road and Railway Engineering Research Institute Sichuan Key Laboratory of Aseismic Engineering and Technology

The frequency and extent of debris flows have increased tremendously due to the extreme weather and the Wenchuan earthquake on May 12, 2008. Previous studies focused on the debris flow from gullies damming the mountain streams. In this paper, an equation for the run-out distance of debris flow in the main river is proposed based on the dynamic equation of debris flow at different slopes given by Takahashi. By undertaking field investigations and flume experiments, a new calculation method of the volume of debris flow damming large river is obtained. Using the percolation theory and the renormalization group theory it was deduced that the large particles should comprise more than 50% for forming a stable debris flow dam. Hence, the criteria of damming large river by debris flow is presented in terms of run-out distance and grain composition which was then validated through the event of damming river by debris flow at Gaojia gully, the upper reaches of the Minjiang River, Sichuan, China, on July 3, 2011.

关键词： Debris flow Damming.large river Criteria Run-out distance Grain composition