基于改进的Vicsek模型的群体决策仿真研究

通过改进Vicsek模型来研究群体决策问题.针对Vicsek模型中过于简单和同质的个体特征,首次通过赋予个体以自信阈值,使得个体在方向更新时不是简单地采用邻居方向的均值,而是考虑自身的方向和邻居方向均值的差异,再以一定规则进行更新.仿真实验结果表明,通过对个体加入符合实际情况的心理特性,会很大程度上影响系统的收敛时间,由此可以得出,在Vicsek模型中加入个体心理特性是符合群体决策实际情况的.     

The optimal configuration of reciprocating engine based on maximum entransy loss

A class of two-heat-reservoir heat engine model with heat leakage,finite heat capacity high-temperature source and infinite heat capacity low-temperature heat sink,is researched with the finite-time thermodynamic theory and the entransy theory.The optimal configuration based on the minimum entropy generation and the maximum entransy loss under the given cycle is searched,which are compared with the optimal configuration based on the maximum output work,and all the heat transfer in the model is assumed to obey the Newton’s law.The results show that,for the infinite heat capacity high-temperature source,the optimal configuration does not change whether heat leakage exists or not;however,for the finite hightemperature reservoir,the optimal configuration is different among which based on the minimum entropy generation,the maximum entransy loss,and the maximum output work when the heat leakage exists.     

基于直觉模糊积分的多属性决策方法

为了研究多属性决策问题中决策属性间存在的关联因素对决策方案的综合评价问题,引入模糊测度的概念,给出直觉模糊积分的定义,并讨论其性质。在此基础上,提出了一个基于直觉模糊积分的多属性群决策方法,并通过实例分析验证了该方法的可行性和有效性。     

某些二性群的结构

设G是一个有限群.我们称G是一个二性群(ambivalent group),如果G中的每个元素与它的逆共轭.本文目的是讨论二性群的性质,确定某些二性群的结构,并对阶小于32的非Abel的二性群进行分类.     

一类基于p~6阶二十七家族群的推广

对p6阶二十七家族群中定义关系进行推广,利用群的扩张理论与自由群理论分别证明了扩张后的群的存在性与定义关系的准确性,得到了一系列新的p-群,并给出了它们的一些性质。     

关于由群与幂等元生成半群的若干组合结果

全变换半群是由它自身的对称群和任意一个秩为n-1的幂等元生成的。特别地,在一个有限集合X上,由置换群和秩为n-1的幂等元生成的半群都是正则的。考虑了Hamilton四元数群的所有子群与幂等元生成纯正半群和逆半群的组合结果。同时,也考虑循环群与二面体群的所有子群与幂等元生成纯正半群与逆半群的情形。     

ZD114牵引电机泄漏电流超标原因及防止措施

ZD114牵引电机多次出现泄漏电流超标,经分析主要原因是从齿轮箱窜入电机内部的油污侵蚀了定子线圈和电枢,导致泄流超标。针对该情况,对电机进行了加装排油管的改造,将窜入的油排至电机外,解决了泄流超标的问题。     

Design and research of torque tube used in HTS motor

In order to improve the overall performance of high temperature superconducting （HTS） motor, a radial connection torque tube with high strength and low thermal leakage has been designed. Firstly, fiberglass epoxy composite is chosen as con- struction material. The structural size of the torque tube is obtained by means of load analysis and theoretical calculation. Secondly, thermal leakage of the torque tube is calculated with both theo- retical method and 3D finite-element analysis （FEA）. According to the result of the thermal analysis and mechanical loads, the struc- tural stresses of the torque tube are also obtained by FEA method. Lastly, a low temperature test platform is developed to verify the strength and the thermal leakage of the torque tube. The results show that the maximal shear stress of the torque tube is 24.3 MPa and thermal leakage of torque tube is 10.5 W, which satisfy the design requirements of the HTS motor. The torque tube also works in good condition at full-power and full-torque testing of the motor. The design method is also applicable for other similar design of torque tube in other applications.     

On nonsingularity and group inverse of linear combinations of generalized and hypergeneralized projectors

In this paper, some conditions for the nonsingularity and group inverses of linear combinations of generalized and hypergeneralized projectors are established. Moreover, some formulae for the inverses and group inverses of them are derived. The work of this paper extends some previous results.     

线性代数向量组正交化的教学改革

线性代数课程中的向量组正交化的传统方法,即施密特正交化过程。多年来,很多教材都是沿用施密特正交化过程方法,但其计算量比较大。论述了使用齐次线性方程组求非零解的方法,将向量组正交化,产生一种新的构思。