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Practical φ_0-stability of stochastic differential equations and corresponding stochastic perturbation theory
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作者 赵平 康宇 宗西举 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2009年第S1期235-238,共4页
The notions of practical φ0-stability were introduced for stochastic differential equations. Sufficient conditions on such practical properties were obtained by using the comparison principle and the cone-valued Lyap... The notions of practical φ0-stability were introduced for stochastic differential equations. Sufficient conditions on such practical properties were obtained by using the comparison principle and the cone-valued Lyapunov function methods. Based on an extended comparison theorem, a perturbation theory of stochastic differential systems was given. 展开更多
关键词 PRACTICAL φ 0-stability STOCHASTIC differential equation comparison principle perturbation theory
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Integral <i>Φ</i><sub>0</sub>-Stability of Impulsive Differential Equations
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作者 Anju Sood Sanjay K. Srivastava 《Open Journal of Applied Sciences》 2015年第10期651-660,共10页
In this paper, the notions of integral Φ0-stability of ordinary impulsive differential equations are introduced. The definition of integral Φ0-stability depends significantly on the fixed time impulses. Sufficient c... In this paper, the notions of integral Φ0-stability of ordinary impulsive differential equations are introduced. The definition of integral Φ0-stability depends significantly on the fixed time impulses. Sufficient conditions for integral Φ0-stability are obtained by using comparison principle and piecewise continuous cone valued Lyapunov functions. A new comparison lemma, connecting the solutions of given impulsive differential system to the solution of a vector valued impulsive differential system is also established. 展开更多
关键词 INTEGRAL φ0 -stability Cone Valued Lyapunov Functions Impulsive Differential Equations Fixed Time IMPULSES
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GA615H-190织机吊综改造
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作者 张保国 胡建伟 《纺织器材》 2003年第1期49-50,共2页
通过分析宽幅有梭织机综框在织造中的受力情况,对其进行加大吊综间距、加装乙形限位杆等改造,使织机总效率大幅提高,综框损坏率显著降低。
关键词 GA615h-19I0织机 吊综 改造 有梭织机
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Practical ф_0 -stability of switched stochastic nonlinear systems and corresponding stochastic perturbation theory
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作者 Yan ZHAO Ping ZHAO 《控制理论与应用(英文版)》 EI CSCD 2013年第1期92-95,共4页
The aim of this paper is to study the practical φ0-stability in probability (Pφ0 SiP) and practical ~o-stability in pth mean (Pφ0SpM) of switched stochastic nonlinear systems. Sufficient conditions on such prac... The aim of this paper is to study the practical φ0-stability in probability (Pφ0 SiP) and practical ~o-stability in pth mean (Pφ0SpM) of switched stochastic nonlinear systems. Sufficient conditions on such practical properties are obtained by using the comparison principle and the cone-valued Lyapunov function methods. Also, based on an extended comparison principle, a perturbation theory of switched stochastic systems is given. 展开更多
关键词 Stochastic nonlinear system Practical φ0-stability Comparison principle Lyapunov function Perturbed system
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高效液相色谱法测定土壤中麦角固醇的含量
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作者 乔洁 张春丹 +2 位作者 毕利东 尧水红 赵英 《江苏农业科学》 北大核心 2017年第4期153-155,共3页
麦角固醇是真菌和一些藻类细胞膜中的主要固醇类物质,真菌死亡后迅速分解,因此它的含量能够用来表征土壤真菌的活性。由于麦角固醇受土壤真菌种类及其生长环境的影响显著且较易被分解,因此建立一种简单、快速、准确的测定麦角固醇含量... 麦角固醇是真菌和一些藻类细胞膜中的主要固醇类物质,真菌死亡后迅速分解,因此它的含量能够用来表征土壤真菌的活性。由于麦角固醇受土壤真菌种类及其生长环境的影响显著且较易被分解,因此建立一种简单、快速、准确的测定麦角固醇含量的方法尤为重要。比较KOH-醇溶液提取法和正己烷-异丙醇提取法2种不同测定方法发现,不通过皂化处理不但不会影响测定的准确率,而且还会大大缩短提取时间,减小提取过程中麦角固醇的损失,从而显著提高回收率。同时,麦角固醇测定方法的回收率被证实与土壤样品水土比之间存在显著的负相关关系(r=-0.943,P<0.05)。 展开更多
关键词 土壤 真菌 麦角固醇 高效液相色谱 测定方法 K0h-醇溶液提取法 正己烷-异丙醇提取法
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用传统贸易理论解释产业内贸易现象所带来的启示
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作者 陈琰辉 《当代经济》 2004年第11期35-36,共2页
传统贸易理论的思想可以用"互通有无"来概括,因为其分析的前提假设是:1、所有的同类商品是同质无差别的:2、商品的市场结构是简单的完全竞争市场.
关键词 贸易理论 产业内贸易 生产要素 h-0-R模型
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Delay-dependent stability analysis of Runge-Kutta methods for neutral delay differential equations 被引量:1
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作者 宋明辉 刘明珠 B S SIDIBE 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2002年第2期129-135,共7页
The aim of this paper is to study the asymptotic stability properties of Runge Kutta(R-K) methods for neutral differential equations(NDDEs) when they are applied to the linear test equation of the form: y′(t)=ay(t)... The aim of this paper is to study the asymptotic stability properties of Runge Kutta(R-K) methods for neutral differential equations(NDDEs) when they are applied to the linear test equation of the form: y′(t)=ay(t)+by(t-τ)+cy’(t-τ), t>0, y(t)=g(t), -τ≤t≤0, with a,b,c∈[FK(W+3mm\.3mm][TPP129A,+3mm?3mm,BP], τ>0 and g(t) is a continuous real value function. In this paper we are concerned with the dependence of stability region on a fixed but arbitrary delay τ. In fact, it is one of the N.Guglielmi open problems to investigate the delay dependent stability analysis for NDDEs. The results that the 2,3 stages non natural R-K methods are unstable as Radau IA and Lobatto IIIC are proved. And the s stages Radau IIA methods are unstable, however all Gauss methods are compatible. 展开更多
关键词 NEUTRAL delay differention equation natural RUNGE-KUTTA methods Nт(0)-stability Nт(0)-com patibility
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时标上脉冲动力系统的h-稳定性
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作者 展正然 袁国强 《山东大学学报(理学版)》 CAS CSCD 北大核心 2012年第8期22-27,共6页
借助比较动力系统的h-φ0-稳定性和锥值Lyapunov函数方法,在时标上建立了脉冲动力系统h-稳定性的一些判定准则。
关键词 脉冲动力系统 h-稳定性 h-φ0-稳定性 锥值LYAPUNOV函数
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微分系统的h稳定性 被引量:1
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作者 王培光 李社军 展正然 《数学的实践与认识》 CSCD 北大核心 2008年第10期187-190,共4页
借助比较微分系统的h-φ0稳定性,利用锥值Lyapunov函数方法,建立了微分系统h稳定性的判定准则.
关键词 微分系统 h稳定性 φ0稳定性 h-φ0稳定性 锥值LYAPUNOV函数
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