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Global Stability in a Competition Model of Plankton Allelopathy with Infinite Delay

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Journal of Systems Science & Complexity 2015年第5期28卷 1070-1079页

作者： CHEN Fengde xie xiangdong WANG Haina Department of Mathematics Ningde Teachers College College of Mathematics and Computer Science Fuzhou University

A competition model of plankton allelopathy with infinite delay is considered in this *** using an iterative method, the global stability of the interior equilibrium point of the system is investigated. The result shows that for this system, delay and toxic substances are harmless for the stability of the interior equilibrium point.

关键词： Equilibrium global stability infinite delay iterative method plankton allelopathy

INTELLIGENT CAR STYLING TECHNIQUE AND SYSTEM BASED ON A NEW AERODYNAMIC-THEORETICAL MODEL

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Chinese Journal of Mechanical Engineering 2002年第2期15卷 110-115页

作者： Huang xiangdong xie Chaolin xie YuecongCollege of Traffic and Communications, South China University of Technology,Guangzhou 510640, China College of Traffic and Communications South China University of Technology Guangzhou 510640

Car styling technique based on a new theoretical model of automotiveaerodynamics is introduced, which is proved to be feasible and effective by wind tunnel *** of a multi-module software system from this technique, including modules of knowledgeprocessing, referential styling and ANN aesthetic evaluation etc, capable of assisting car stylingworks in an intelligent way, is also presented and discussed.

关键词： Automotive aerodynamics Artificial intelligence Computer aided styling

蜗壳式多通道气液旋流分离器结构优化及分离特性研究

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化工学报 2024年第8期75卷 2875-2885页

作者：李彦熹王晔春谢向东王进芝王江周煜潘盈秀丁文涛郭烈锦西安交通大学动力工程多相流国家重点实验室陕西西安710049

为实现宽流量范围下气液两相流的高效分离,基于螺旋线理论设计出了一种新型蜗壳式多通道旋流分离器,并对其结构进行了优化设计。采用数值模拟方法将其与传统单入口气液旋流分离器进行性能对比,结果表明,新型蜗壳式多通道旋流分离器能有... 详细信息

为实现宽流量范围下气液两相流的高效分离,基于螺旋线理论设计出了一种新型蜗壳式多通道旋流分离器,并对其结构进行了优化设计。采用数值模拟方法将其与传统单入口气液旋流分离器进行性能对比,结果表明,新型蜗壳式多通道旋流分离器能有效解决单个入口所引起的空气核偏心现象及振荡问题,分离器内流场在不同入口含气率条件下均具有显著的轴对称特点,稳定性也更高,溢流带液量明显下降。虽然整体压损更大,但能够有效抑制二次流的产生,且在入口含气率越高时抑制效果越明显。

关键词：气液两相流离心分离优化设计蜗壳二次流

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Experimental investigation on separation characteristics of axial cyclone separator

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Science China(Technological Sciences) 2023年第11期66卷 3231-3244页

作者： WANG JinZhi WANG YeChun HAN JinZai XU Qiang xie xiangdong PAN YingXiu GUO LieJin State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Xinjin Weihua Institute of Clean Energy Research Foshan 528216China Aero Engine Corporation of China(AECC)Shenyang Engine Research Institute Shenyang 110015China

Axial cyclone separator has been widely applied in chemical production as an efficient gas-liquid separation *** this study,a new axial cyclone separator with integrated swirler and exhaust pipe is designed to achieve the development goal of compact structure for advanced engine,and the distribution characteristics of swirling flow patterns as well as the variation in separation characteristics are investigated under slug flow *** on flow visualizations and fluctuation characteristics of pressure signals,three typical flow patterns,namely,slug flow,swirling intermittent flow,and swirling annular flow,in the horizontal swirling separation flow are *** is investigated how the inlet conditions affect the separation characteristic *** separation purity and extreme points of the air separation efficiency are independent of the inlet liquid flow *** separation pressure drop is quadratically related to the inlet air flow *** on the drift-flux model and other methods,the prediction methods for the air separation efficiency and pressure drop are proposed,and the prediction accuracy is within±20%,which may provide instructions for the practical application of axial cyclone separator.

关键词： axial cyclone separation gas-liquid two-phase flow flow pattern in the swirling flow separation characteristics

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日本北海道函馆电站主轴密封装置的改进

小水电 2024年第3期 54-55页

作者：蒋顺谢向东陆松祝晓伟浙江金轮机电实业有限公司浙江金华321002

水轮机主轴密封装置是水轮机组的重要组成部分,对机组的运行安全有重要的影响;以前广泛采用的密封方式存在密封效果不佳、更换成本过高、结构较为复杂等缺点。结合日本北海道函馆电站主轴密封装置的实例,提出一种结构简单、密封效果好... 详细信息

水轮机主轴密封装置是水轮机组的重要组成部分,对机组的运行安全有重要的影响;以前广泛采用的密封方式存在密封效果不佳、更换成本过高、结构较为复杂等缺点。结合日本北海道函馆电站主轴密封装置的实例,提出一种结构简单、密封效果好、安装方便、易于更换的主轴密封装置。经过改进后的使用情况来看,效果良好,取得不错的效益。图2幅。

关键词：水轮机主轴密封密封装置技术改进

HOPF BIFURCATION AND UNIQUENESS OF LIMIT CYCLE FOR A CLASS OF QUARTIC SYSTEM

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Applied Mathematics(A Journal of Chinese Universities) 2007年第4期22卷 388-392页

作者： Zhan Qingyi xie xiangdong Wu Chengqiang Qiu Shulin Dept. of Comput. and Inform. Fujian Agriculture and Forestry Univ. Fuzhou 350002 China. Dept. of Math. Ningde Normal College Ningde 352100 China. College of Math. and Comput. Sci. Fuzhou Univ. Fuzhou 350002 China. Dept. of Math. Gannan Normal College Ganzhou 341000 China.

This paper studies a class of quartic system which is more general and realistic than the quartic accompanying system.x＇=-y＋ex＋lx^2＋mxy＋ny^2,y＇=x（1-Ay）（1＋Cy^2）,（＊）where C 〉 0. Sufficient conditions are ... 详细信息

关键词： accompanying system, bifurcation limit cycle uniqueness.

THE UNIQUENESS OF LIMIT CYCLE AND THE STRUCTURE OF CRITICAL POINT AT INFINITY FOR A CLASS OF CUBIC SYSTEM

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Annals of Differential Equations 2005年第3期21卷 474-479页

作者： xie xiangdong Chen Fengde Dept. of Math. Ningde Teachers College Ningde 352100 College of Math. and Computer Science Fuzhou University Fuzhou 350002

A class of cubic system, which is an accompany system of a quadratic differential one, is studied. It is proved that the system has at most one limit cycle, and the critical point at infinity is a higher order one. Th... 详细信息

关键词： cubic system accompany system limit cycle uniqueness

DYNAMIC BEHAVIOURS OF AN AUTONOMOUS STAGE-STRUCTURED COMPETITIVE SYSTEMS WITH TOXIC EFFECT

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Annals of Applied Mathematics 2017年第4期33卷 400-416页

作者： Liqiong Pu xiangdong xie School of Math.and Statistics Hexi University Dept.of Math. Ningde Normal University

An autonomous stage-structured competitive systems with toxic effect is investigated in this paper. Sufficient conditions which guarantee the global attractivity of the system and the extinction of the partial species are obtained, respectively. Our results supplement and compliment one of the main results of Liu and Li [Global stability analysis of a nonautonomous stage-structured competitive system with toxic effect and double maturation delays, Abstract and Applied Analysis, Volume 2014, Article ID 689573, 15 pages].

关键词： global attractivity extinction delay toxic substance

STABILITY OF LOTKA-VOLTERRA COOPERATION SYSTEM WITH SINGLE FEEDBACK CONTROL

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Annals of Applied Mathematics 2015年第3期31卷 287-296页

作者： Rongyu Han Fengde Chen xiangdong xie College of Math and Computer Science Fuzhou University Dept of Math. Ningde Normal University

In this paper, a Lotka-Volterra cooperation system with single feedback control is proposed and studied. We investigate the local stability and the global stability of the system. Our study shows that with suitable restriction on the coefficients of the feedback control variable, the system can still remain globally stable or become extinct, which shows that the feedback control variable plays a very important role in the dynamics behaviors of the system.

关键词： cooperation system feedback control Lyapunov function global sta-bility