A quasi-isentropic model of a cylinder driven by aluminized explosives based on characteristic line analysis

A quasi-isentropic study on the process of driving a cylinder with aluminized explosives was carried out to examine the influence of the aluminum (Al) reaction rate on cylinder expansion and the physical parameters of the detonation products. Based on the proposed quasi-isentropic hypothesis and relevant isentropic theories, the characteristic lines of aluminized explosives driving a cylinder were analyzed, and a quasi-isentropic model was established. This model includes the variation of the cylinder wall velocity and the physical parameters of the detonation products with the Al reaction degree. Using previously reported experimental results, the quasi-isentropic model was verified to be applicative and accurate. This model was used to calculate the physical parameters for cylinder experiments with aluminized cyclotrimethylenetrinitramine explosives with 15.0 % and 30.0 % Al content. The results show that this quasi-isentropic model can be used not only to calculate the cylinder expansion rule or Al reaction degree, but also to calculate the physical parameters of the detonation products in the process of cylinder expansion. For explosives with 15.0 % and 30.0 % Al, 24.3 % and 18.5 % of the Al was found to have reacted at 33.9 μs and 34.0 μs, respectively. The difference in Al content results in different reaction intensity, occurrence time, and duration of two forms of reaction (diffusion and kinetic) between the Al powder and the detonation products; the post-detonation burning reaction between the Al powder and the detonation products prolongs the positive pressure action time, resulting in a continuous rise in temperature after detonation.     

小学语文课外阅读中协同知识建构的特征研究

小学阶段是培养学生阅读兴趣的重要阶段,这一阶段应该以多种形式开展课外阅读以培养学生的阅读素养。知识建构在培养学生语言能力、审美、鉴赏、创造思维、文化传承与理解方面发挥着重要的作用,在小学语文课外阅读中有广泛的应用空间。研究以小学五年级所开展的课外阅读为例,对学生在课外阅读中协同知识建构过程进行了分析,发现课外阅读过程中的协同知识建构具有过程性、自发性、可持续发展性的特征,对培养学生的口语表达能力、审美能力、创作能力和人际交往能力有积极的作用。     

Thermal explosion of a reactive gas mixture at constant pressure for non-uniform and uniform temperature systems

In this study, the approximate and exact solutions for the stationary-state of the solids model with neglecting reactant consumption for both non-uniform and uniform temperature systems were applied on gas ignition under a constant pressure condition. The criticality conditions for a slab, an infinite cylinder, and a sphere are determined and discussed using dimensionless temperatures under constant ambient and surface temperatures for a non-uniform temperature system. Exact solution for a Semenov model with convection heat loss was also presented. The solution of the Semenov problem for constant volume or density as a solid and constant pressure were compared. The critical parameter δ is calculated and compared with those of Frank-Kamenetskii solution values. The validation of the calculated ignition temperatures with other exact solution and experimental results were offered. The relation between critical parameters form Semenov and F.K. models solution was introduced.     

科学管理、精益管理与精确作战工程保障研究

设计是作战行动筹划的重要步骤,精确工程保障需要对工程保障行动进行精密的设计和精确管理与控制。科学管理采用科学实验的方法,通过劳动方法标准化和差别计件工资制度,有效提高了工作效率,其基本原理经过百余年的实际检验,被证明是一个成熟有效的管理方法。借鉴科学管理理论,需要对工程保障行动进行动作研究,进而研究工程保障行动的作业标准,以期提高其保障效率。精益管理是在科学管理在新的历史时期的发展与改进,它使用了准时制、零库存、均衡生产、持续改进等先进的管理理念和六西格玛管理、成组技术等先进技术,为基于信息系统体系作战的工程保障能力生成提供了有益的借鉴,可加深我们对精确工程保障的理解,促进精确工程保障研究的可操作性。     

分布式储能技术的探索与实践

文章阐述了分布式储能技术的重要意义,介绍了分布式储能技术在经济社会可持续发展重要领域——能源互联网发展中的重要地位,并对分布式储能的技术形态与载体进行了分析,最后以信息网络重要组成部分——数据中心为应用场景,对分布式储能技术的实践进行了探讨。     

基于专利情报分析的Cubic公司MILES激光交战系统研究

在阐述了国内对实兵交战系统需求现状的基础上,文章提出了研究MILES系统的意义,利用Cubic公司的MILES系统专利进行定量分析和定性分析,在此基础上得出结论。MILES系统是成熟的实兵交战系统,其专利价值高,技术领域分布广,模拟效果佳,可以有效帮助部队提升实际作战能力,其专利技术很有借鉴价值。此结果可以用于帮助我国的实兵交战系统技术领域的研究和发展。最后提出一些关于学习MILES系统的建议。     

靶标系统集控软件设计

为提高靶场现有靶标设备的综合利用效率,解决战术射击训练时大量不同型号靶标混合使用中的集中控制问题,采用软件集成方式,设计开发一种模块化、通讯协议自适应的集控系统软件,通过基于XML的协议解析模板,动态匹配不同通讯协议的靶标设备,解决多型设备集成应用问题。实际应用结果表明,该系统有效提升了靶场现有设备的利用效率,同时也为靶场其他应用系统的综合集成提供了很好的实现途径。     

战争制胜机理何以发生变化

信息化战争已经登上了当今世界的舞台,这是军事领域发生的革命性变化。在信息化战争条件下,传统的战争制胜机理发生的新的变化。     

飞机电磁弹射系统发展及其关键技术

总结论述了美国和英法国家的飞机电磁弹系统工程化应用研制的发展状况,综述了电磁弹射用直线电机的方案选型设计、仿真技术、性能优化和控制方法等方面的关键技术和研究现状,针对电磁弹射技术的发展前景和应用给出了相关建议,为国内电磁弹射相关技术的发展提供了借鉴。