关于序半群左整除序关系的链(英文)

介绍了左△-序半群和完全左同余的概念,给出了左整除序关系的链的性质.最后,证明了带有左整除序关系的链的零半群是左△-序半群.     

拓扑序空间中的广义向量值均衡问题及其应用

在拓扑序空间的框架下,利用一个序KKM型定理证明了一些广义向量值均衡问题解的存在性定理.并运用这些定理证明了在没有线性结构的拓扑序空间内非合作博弈的纳什均衡存在性定理.     

核函数距离K-均值聚类的网络入侵检测算法

分析了对新型未知攻击的入侵检测,提出了核函数距离的K-均值聚类入侵检测算法．     

一种基于可变滑动窗口的数据流分段聚类算法

数据流的应用越来越广泛,数据流挖掘成为数据挖掘的重点研究方向之一。在分析各种数据流聚类算法的基础上,提出了一种基于可变滑动窗口的数据流分段聚类算法。算法以时间序列数据流模式表示技术为参考,以去除噪音和压缩数据为目的,实现了数据流的特征提取和概要存储。实验表明,算法具有低时空复杂度、自适应等特点。     

确定岩体力学参数先验分布的随机加权Bayes方法

岩体力学参数在进行Bayes法统计时必须利用先验分布,但经常出现先验信息少而不能确定先验分布的情况.为了解决小样本条件下先验分布确定的问题,采用随机加权重采样技术,产生岩体力学参数再生样本来模拟先验信息的总体分布,从而获得岩体力学参数先验信息统计分布的均值与方差,将其与当前样本分布信息代入贝叶斯公式,从而实现了对岩体力学参数后验分布的确定.仿真算例证明,这种方法在进行岩体力学参数估计时比经典参数估计方法有更高的精确性.     

关于序半群的C-理想

研究序半群的C-理想,给出了序半群的C-理想的若干性质,并且用C-理想研究了序半群的若干性质。     

大尺度冲击性煤体电阻率变化规律的实验研究

在未加载条件下对大尺度煤样的电阻率测试结果表明,在自然状态下煤样的电阻率较大;经过浸泡后其电阻率明显下降.在单轴压缩条件下的大尺度冲击性煤样电阻率实验表明,电阻率变化曲线整体上成不对称的"凹"型,基本符合二次曲线;煤样电阻率随压力增加逐渐减少,当达到一定的应力值时,电阻率达到最小值;继续加载,电阻率将升高,直到完全失稳.1#、3#和4#煤样单轴抗压强度与其受载过程中的视电阻率变化存在一定的正相关性;受载煤体的电阻率变化与其变形破裂过程中的裂隙分叉、发育、汇合贯通密不可分;兼有剪裂和拉裂特点的破坏类型可能是大尺度煤样较常见的破坏形式.     

Nickel-introduced structurally ordered PtCuNi/C as high performance electrocatalyst for oxygen reduction reaction

Designing highly active and durable oxygen reduction reaction (ORR) electrocatalysts is essential for developing efficient proton-exchange membrane fuel cells (PEMFCs). In this work, ordered PtCuNi/C nanoparticles (NPs) were synthesized using an impregnation reduction method. This study shows that the incorporation of Ni in ordered PtCu/C can effectively adjust the electronic structure of Pt, thereby optimizing oxygen binding energy for the ORR. The obtained intermetallic ordered PtCuNi/C NPs significantly improved ORR activity and durability compared to ordered PtCu/C. Specifically, PtCu_0·5Ni_0·5/C-700 shows a mass activity of 1.29 ​A ​mg _Pt⁻¹ ​at 0.9 ​V vs. reversible hydrogen electrode (RHE), which is about 9.2 times higher than that of commercial Pt/C. PtCu_0.5Ni_0.5/C-700 is also shown to be competent cathode catalyst for a single-cell system exhibiting high power density (461 ​mW ​cm⁻²). This work demonstrates that ordered PtCu_0·5Ni_0·5/C-700 can be used as a highly active and durable ORR catalyst in PEMFCs.     

基于改进IOWA组合模型的舰船装备维修费预测

针对诱导有序加权平均（induced ordered weighted averaging,IOWA）组合模型中,单项预测方法精度相同时诱导值可能存在多种不同排列顺序的问题,提出综合考虑预测方法的历史性能确定其唯一排序;针对实践中单项预测方法较多时,IOWA组合模型构建过程十分复杂的问题,通过构建适合于Matlab软件计算的最优化模型矩阵形式,降低计算复杂性;结合舰船装备维修费预测中样本小、预测方法多的特征,采用各单项预测方法的历史平均拟合精度来估计其预测期诱导值的排序,并以此计算组合预测值。最后实例说明了该方法的有效性。     

Interval-valued intuitionistic fuzzy aggregation operators

The notion of the interval-valued intuitionistic fuzzy set (IVIFS) is a generalization of that of the Atanassov’s intuitionistic fuzzy set. The fundamental characteristic of IVIFS is that the values of its membership function and non-membership function are intervals rather than exact numbers. There are various averaging operators defined for IVIFSs. These operators are not monotone with respect to the total order of IVIFS, which is undesirable. This paper shows how such averaging operators can be represented by using additive generators of the product triangular norm, which simplifies and extends the existing constructions. Moreover, two new aggregation operators based on the ukasiewicz triangular norm are proposed, which are monotone with respect to the total order of IVIFS. Finally, an application of the interval-valued intuitionistic fuzzy weighted averaging operator is given to multiple criteria decision making.