On schemes for congruence distributivity

We present diagrammatic schemes characterizing congruence 3-permutable and distributive algebras. We show that a congruence 3-permutable algebra is congruence meetsemidistributive if and only if it is distributive. We characterize varieties of algebras satisfying the so-called triangular scheme by means of a Maltsev-type condition.     

模糊拓扑环的模糊复范化

引入环上的模糊复范数概念 ,得到模糊拓扑环可模糊复范化的充分必要条件 ,从而揭示出模糊拓扑环与普通拓扑环所不同的一个新特点 .     

On stability of moving autonomous mechanical systems under uncertainty

Conditions of stability with respect to two measures of autonomous mechanical systems under uncertainty are established by decomposing the phase space of the system, a space of fuzzy sets, and using the natural monotonicity of fuzzy differential equations __________ Translated from Prikladnaya Mekhanika, Vol. 44, No. 2, pp. 119–131, February 2008.     

城市防洪减灾决策方案优化研究

城市防洪减灾决策的成功与否直接影响着将来的洪水所造成的损失大小.如何应用自然、经济和社会信息,经超前分析以确保实施某一优化方案之后所造成的损失最小是防洪减灾决策的核心问题.本文深入地分析了城市防洪减灾决策方案优化的众多影响因素,在此基础上把模糊优选神经网络模型应用到城市防洪减灾方案优化中,并建立了城市防洪减灾方案优化模型,并通过实例验证了其有效性.     

基于T-S模糊模型的非线性不确定系统奇偶方程鲁棒故障诊断

针对T-S模糊模型描述的具有外部干扰的非线性不确定系统,构造了相应的测量冗余方程和奇偶方程,给出并证明了对特定传感器和执行器故障敏感的最优奇偶向量的存在条件和求解定理.采用奇偶方程故障检测与诊断方法,研究了非线性不确定系统的鲁棒故障检测和诊断.最后,通过仿真示例说明了本文所提出的方法是有效的.     

模糊聚类法在企业核心竞争力评价指标体系构建中的应用

企业核心竞争力评价指标体系的科学构建,是客观评价企业核心竞争力的前提.按照一定的原则选取指标和构建体系,并运用模糊聚类法给出具体指标处理和聚类过程,在聚类的基础上应用集合的m组分类思想和灰理论中的关联度对构建的指标体系进行分析,进一步对构建的指标体系检验,表明构建思想的科学性.     

装备系统评价的模糊白化灰色关联模型

灰色系统理论是现代工程领域解决数据不确定性和数据量不足问题的有效方法 .装备系统的评价信息往往具有模糊性和灰色性双重特征 .模糊白化灰色关联模型源于武器系统的保障性评价 ,将其应用范围扩展到一般的武器系统评价 ,提出了装备系统评价模糊白化灰色关联模型 .在定性指标模糊白化的基础上 ,对所要评价的整个系统进行灰色关联分析 ,以得到评价结果     

光电检测技术在模糊控制洗衣机中的应用

介绍了应用光电检测相关技术对模糊控制洗衣机的被洗衣物质料、衣物重量、脏污程度、脏污性质和洗涤剂量的快速准确检测方法及工作原理,通过相应的光电传感器实时检测出被洗衣物相关参数,以此作为模糊逻辑推理依据,来决定电动机的转速、洗涤水位和洗涤时间,经过实践验证它在节电、节水和洗净率等方面取得了良好的效果。     

Highly efficient cascaded P-doped Raman fiber laser pumped by Nd:YVO4 solid-state laser

A highly efficient cascaded P-doped Raman fiber laser （RFL） pumped by a 1064-nm continuous wave （CW） Nd：YVO4 solid-state laser is reported. 1.15-W CW output power at 1484 nm is obtained while the input pump power is 4 W, corresponding to the power conversion efficiency of 28.8%. The threshold pump power for the second-order Stokes radiation is 1.13 W. The slope efficiency is as high as 42.6%. The experimental results are in good agreement with theoretical ones. Furthermore, the power instability of the P-doped RFL at 1484 nm in an hour is observed to be less than 5%.     

A model for aerosol mass concentration using an optical particle counter

A model for measuring aerosol mass concentration by an optical particle counter is presented using the conception of the average mass. In this model, to understand the meaning of the pulse height distribution of particles which is used to inverse mass concentration, the relationship among intensity distribution in the optical sensing volume, particle shape, and the pulse height distribution is discussed. To solve the instability of the equivalent factor, a novel two-step calibration method is proposed. The experimental results demonstrate that mass concentrations calculated by the model are in good agreement with those measured by a norm-referenced instrument. For samples of soot and air, the slopes of fitting lines of data points are 0.9582 and 0.9220, and the correlation coefficients are 0.9991 and 0.9965, respectively.