基于超网络的舆论演化动态模型

针对舆论演化过程中的复杂动力学问题,提出了超网络视觉下的舆论演化动态模型,该模型包括节点的添加、重新连接链路、超边的添加以及节点的老化4个过程,其中节点代表关键词,超边代表关键词所构成的话题。其次,利用非均匀网络的演化机制,分别对该动态演化模型的超度、节点自身关注度与节点间影响力两个因素的超度进行了详细的理论分析,分析结果表明节点超度完全符合幂律分布。最后,通过Matlab仿真模拟,分析了不同参数对节点超度分布变化的影响,并进一步验证了结果是遵循幂律分布的。     

民航飞机客舱乘务员应急处置能力分析

为提高民航飞机客舱乘务员应急处置能力,根据专家访谈和相关规章,选取了22项民机客舱乘务员应急处置能力指标。通过编制问卷进行调研,使用SPSS22.0对问卷统计数据进行信度、效度检验及因子分析得到旋转后的各指标的因子载荷,从中提取4个二级指标,并根据各自特点依次命名为基本素质、知识基础、职业技能、处置能力。根据指标体系建立民机客舱乘务员应急处置能力结构方程模型,提出假设模型。使用AMOS24.0对假设模型进行验证和拟合优度检验,最后根据各指标标准化路径指数计算得到各指标的权重。结果表明：对乘务员应急处置能力影响最大的是基本素质,然后依次为处置能力、职业技能、知识基础。     

网络博弈合作剩余收益分配的协商方法

参与者在进行网络博弈时有机会与其相邻参与者签署协议进行合作,此时参与者之间的博弈关系构成了一个网络结构,并可以使用无向图来表示.参与者之间依据网络结构选择合作对象进行合作,进而产生剩余收益,而剩余收益通过协商的方式在两个参与者之间进行分配.本文依据协商理论与匹配理论,研究网络博弈环境下参与者之间如何签署协议进行合作,进而分配合作产生的剩余收益的问题,称为网络协商博弈,并给出基本的可行解的形式.通过限制参与者可以签署协议的数量,本文对网络协商博弈进行分类,使用协商与匹配方法研究每一类网络协商博弈的合理解的具体形式并设计求解方法.本文的结果表明:参与者之间的合作以及合作收益的分配不仅与网络博弈自身有关,而且与参与者能够签署的合作协议数量有关.研究拓展了协商方法在网络协商问题中的应用,为多边合作对象的选择以及合作剩余收益的分配提供了参考.     

刮板输送机如何满足连采机的配套使用

刮板输送机是连续采煤机运输系统中煤炭运输的重要设备,其是否可靠运行,直接关系到采掘工作面能否正常生产的问题。有时一个很小的故障发生,如果不能及时地得到有效的处理,轻者会造成采掘工作面停产,重者影响到整个煤矿生产秩序的顺利进行,甚至还会烧毁电动机,毁坏设备,发生人身伤亡事故,给煤矿造成很大的经济损失。通过对刮板输送机常见故障和原因分析,提出改进措施,经实践表明经济实用,安全可靠。     

TDLAS湿度传感器与维萨拉湿度传感器性能对比研究

水汽含量对于诸如文物保护、气象、工业生产等领域都有明确标准并需要严格控制,因此能够精确和快速的实现环境湿度监测已成为一大研究热点.现在常用的湿度传感器为芬兰VAISALA生产的湿度传感器系列,但是其测湿部分采用聚合物高分子薄膜电容传感器,存在响应时间长,褪湿慢等缺点,已经不能满足用户需求.基于TDLAS技术的湿度传感器使用半导体激光器作为光源,参考气室提供光谱调节反馈,构成了一种高精度水汽含量检测系统,响应速度快,灵敏度高,可以克服传统湿度传感器的不足.该文以米歇尔露点仪为标准,对比测试了TDLAS湿度传感器与传统的VAISALA电容传感器响应时间、测量精度等性能.证明了TDLAS湿度传感器具有更好的测量准确度与灵敏度.     

Synergetic effect of multiple phases on hydrogen desorption kinetics and cycle durability in ball milled MgH2–PrF3–Al–Ni composite

A new MgH₂–PrF₃–Al–Ni composite was prepared by ball milling under hydrogen atmosphere. After initial dehydrogenation and rehydrogenation, Pr₃Al₁₁, MgF₂, PrH₃ and Mg₂NiH₄ nanoparticles formed accompanying the main phase MgH₂. The hydrogen absorption-desorption properties were measured by using a Sieverts-type apparatus. The results showed that the MgH₂–PrF₃–Al–Ni composite improved cycle stability and enhanced hydrogen desorption kinetics. The improvement of hydrogen absorption-desorption properties is ascribed to the synergetic effect of the in situ formed Pr₃Al₁₁, MgF₂, PrH₃ and Mg₂NiH₄ nanoparticles. This work provides an important inspiration for the improvement of hydrogen storage properties in Mg-based materials.     

Mean Square Average Generalized Consensus of Multi-Agent Systems Under Time-Delays and Stochastic Disturbances

Compared with the traditional consensus problem, this paper deals with the mean square average generalized consensus(MSAGC) of multi-agent systems under fixed directed topology, where all agents are affected by stochastic disturbances. Distributed protocol depending on delayed time information from neighbors is designed. Based on Lyapunov stability theory, together with results from matrix theory and It o s derivation theory, the linear matrix inequalities approach is used to establish sufficient conditions to ensure MSAGC of multi-agent systems. Finally, numerical simulations are provided to illustrate the theoretical results.     

Improved hemimorphite flotation using xanthate as a collector with S(Ⅱ) and Pb(Ⅱ) activation

The flotation of hemimorphite using the S(Ⅱ)–Pb(Ⅱ)–xanthate process,which includes sulfidization with sodium sulfide,activation by lead cations,and subsequent flotation with xanthate,was investigated.The flotation results indicated that hemimorphite floats when the S(Ⅱ)–Pb(Ⅱ)–xanthate process is used; a maximum recovery of approximately 90% was obtained.Zeta-potential,contact-angle,scanning electron microscopy–energy-dispersive spectrometry(SEM–EDS),and diffuse-reflectance infrared Fourier transform spectroscopy(DRIFTS) measurements were used to characterize the activation products on the hemimorphite surface and their subsequent interaction with sodium butyl xanthate(SBX).The results showed that a Zn S coating formed on the hemimorphite surface after the sample was conditioned in an Na2 S solution.However,the formation of a Zn S coating on the hemimorphite surface did not improve hemimorphite flotation.With the subsequent addition of lead cations,Pb S species formed on the mineral surface.The formation of the Pb S species on the surface of hemimorphite significantly increased the adsorption capacity of SBX,forming lead xanthate(referred to as chemical adsorption) and leading to a substantial improvement in hemimorphite flotation.Our results indicate that the addition of lead cations is a critical step in the successful flotation of hemimorphite using the sulfidization–lead ion activation–xanthate process.     

Two Innovative Coalition Formation Models for Dynamic Task Allocation in Disaster Rescues

This paper addresses the problem of multi-objective coalition formation for task allocation. In disaster rescue, due to the dynamics of environments, heterogeneity and complexity of tasks as well as limited available agents, it is hard for the single-objective and single (task)-to-single (agent) task allocation approaches to handle task allocation in such circumstances. To this end, two multi-objective coalition formation for task allocation models are proposed for disaster rescues in this paper. First, through coalition formation, the proposed models enable agents to cooperatively perform complex tasks that cannot be completed by single agent. In addition, through adjusting the weights of multiple task allocation objectives, the proposed models can employ the linear programming to generate more adaptive task allocation plans, which can satisfy different task allocation requirements in disaster rescue. Finally, through employing the multi-stage task allocation mechanism of the dynamic programming, the proposed models can handle the dynamics of tasks and agents in disaster environments. Experimental results indicate that the proposed models have good performance on coalition formation for task allocation in disaster environments, which can generate suitable task allocation plans according to various objectives of task allocation.