One-step synthesis of FeO(OH) nanoparticles by electric explosion of iron wire underwater

In this study,we investigated electric explosion of iron wire in distilled water with different energy input adjusted by charging voltage.The as-prepared samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS),showing the presence of iron and multiple iron-based compounds oxides with contents influenced by the experimental conditions.In particular,pure FeO(OH) nanoparticles were obtained using electric explosion of iron wire with energy input of 1125 J at charging voltage of 15 kV.Analysis of discharge current and resistive voltage data indicate that the high energy input induced by strong plasma discharge at high charging voltage is a key factor to form FeO(OH).This study presents a one-step method to synthesize FeO(OH) nanoparticles using electric explosion of iron wire.     

Driving force coordinated control of an 8 ×8 in-wheel motor drive vehicle with tire-road friction coefficient identification

Because of the complexities of tire-road interaction,the wheels of a multi-wheel distributed electric drive vehicle can easily slip under certain working conditions.As wheel slip affects the dynamic per-formance and stability of the vehicle,it is crucial to control it and coordinate the driving force.With this aim,this paper presents a driving force coordination control strategy with road identification for eight-wheeled electric vehicles equipped with an in-wheel motor for each wheel.In the proposed control strategy,the road identification module estimates tire-road forces using an unscented Kalman filter al-gorithm and recognizes the road adhesion coefficient by employing the recursive least-square method.According to road identification,the optimal slip ratio under the current driving condition is obtained,and a controller based on sliding mode control with a conditional integrator uses this value for accel-eration slip regulation.The anti-slip controller obtains the adjusting torque,which is integrated with the driver-command-based feedforward control torque to implement driving force coordination control.The results of hardware-in-loop simulation show that this control strategy can accurately estimate tire-road forces as well as the friction coefficient,and thus,can effectively fulfill the purpose of driving force coordinated control under different driving conditions.     

The investigation of NTO/HMX-based plastic-bonded explosives and its safety performance

3-nitro-1,2,4-triazol-5-one (NTO) is the main component of insensitive munitions (IM) formulation because of its outstanding insensitive properties.In this paper,a series of NTO/HMX-based composite explosives were prepared and characterized.The study focuses on the effect of NTO on the performance of the formulations,especially the safety performance.The results revealed that the mechanical sensi-tivity of formulations was associated with NTO content,as well as the thermal conductivity,specific heat capacity and Arrhenius parameters.Then,the high amount of NTO using in formulation was proved to be helpful for NTO/HMX-based formulation to exhibit good thermal safety.Besides,by accelerating rate calorimeter (ARC) and a modified cook-offequipment,the pressure and pressure rise rate were proved as the important indicator for judging the thermal safety performance in confined spaces.Finally,the numerical simulation was used as a credible method for predicting the respond temperature of cook-off experiment.     

海拔对离心泵吸入性能的影响

海拔对离心泵吸入性能影响较大,但对应关系不明确。为定量分析海拔与离心泵吸入性能的关系,需进行泵高原工作吸入性能实验。海拔与真空度关系密切,利用控制泵吸入口真空度的方法,开展泵高原工作吸入性能模拟实验,获取各工况下泵吸入口持液率数据,并绘制曲线图。实验结果表明：海拔每升高500 m,泵吸入口持液率下降2%~5%;随着海拔的提升,泵吸入性能下降速率加快,工作状态趋于不稳定。     

悬臂式围护桩受力性状与内力传递特征试验

为研究悬臂式围护桩结构的内力、弯矩、位移和嵌固段的变化规律及特点,结合西宁火车站综合改造工程,对该深基坑支护结构在不同开挖工况条件下悬臂桩的受力性状与内力传递特征进行现场动态测试试验。试验结果表明:悬臂桩的受力特征与理论值有所差异,在实际设计中可对其在配筋方式、混凝土强度设计、嵌固段长度等方面进行优化。试验结果可以有效优化桩身设计,为复杂基坑在开挖过程中的支护结构受力及变形提供参考性依据。     

多样化军事任务舆情演化及引导的仿真

针对海军遂行多样化军事任务所面临的日益复杂的社会舆论环境,采用基于Agent的建模理论与方法,建立了舆情演化过程的模型,并对其进行了仿真和分析。首先,提出了个体间观点交互的规则,建立了个体观点交互的舆情演化模型。其次,基于所建模型对不同条件下的舆情演化及引导进行了仿真实验与分析。仿真结果表明,模型的统计结果与实际舆情演化情况相符,具有较强的实际性。     

从孙子“静以幽，正以治”谈军校学员领导力培养

坚强的领导力是确保军事行动成功的关键。军校学员领导力不同于普通意义上的领导力。孙子“静以幽,正以治”的论述,揭示了军校学员领导力培养的基本内容、基本标准和各内容之间的辩证关系,对军校学员领导力培养具有重要的启迪意义。军校必须将培养超常的心质作为学员领导力的基础,把提升思维的广度和深度作为学员领导力的保障,将培养强烈的感召力作为学员领导力的核心,将培养坚强的执行力作为学员领导力的支撑。     

计算机科学与技术专业课程体系的建设与实践

计算机科学与技术专业是一门随着社会、经济、科技的飞速发展而不断更新的学科,为了培养具有开拓、创新、适应社会发展的高素质工程应用型人才,我们必须不断加强计算机科学与技术专业的课程体系建设。本文结合我校计算机科学与技术专业教学和应用现状,通过建立良好的课程体系,使课程教学能更系统、更具目的性;同时将实践教学摆到了重要的位置,注重课程体系的组织与学生能力培养和素质提高的密切结合。     

典型机舱火灾喷雾冷却效果数值仿真

针对船舶机舱火灾喷雾冷却效果问题,分析了机舱封闭环境中喷雾灭火的传热传质过程,构建并设置了具体的船舶机舱典型火灾环境;结合船舶机舱火灾发生条件下可能遭遇的典型故障状态,运用火灾动力学软件进行了数值仿真,进一步分析了喷头压力、数量以及火源位置等单因素和多因素耦合作用对船舶机舱喷雾系统冷却效果的影响,并给出了一种验证喷雾系统控制火灾能力的仿真计算方法.仿真分析表明:该方法可以模拟机舱喷雾灭火过程,对于分析并掌握救援过程中船舶机舱温度场的变化具有应用价值.     

Impact of reseller's and sales agent's forecasting accuracy in a multilayer supply chain

We consider a three‐layer supply chain with a manufacturer, a reseller, and a sales agent. The demand is stochastically determined by the random market condition and the sales agent's private effort level. Although the manufacturer is uninformed about the market condition, the reseller and the sales agent conduct demand forecasting and generate private demand signals. Under this framework with two levels of adverse selection intertwined with moral hazard, we study the impact of the reseller's and the sales agent's forecasting accuracy on the profitability of each member. We show that the manufacturer's profitability is convex on the reseller's forecasting accuracy. From the manufacturer's perspective, typically improving the reseller's accuracy is detrimental when the accuracy is low but is beneficial when it is high. We identify the concrete interrelation among the manufacturer‐optimal reseller's accuracy, the volatility of the market condition, and the sales agent's accuracy. Finally, the manufacturer's interest may be aligned with the reseller's when only the reseller can choose her accuracy; this alignment is never possible when both downstream players have the discretion to choose their accuracy. © 2014 Wiley Periodicals, Inc. Naval Research Logistics 61: 207–222, 2014