Reaction degree of composition B explosive with multi-layered compound structure protection subjected to detonation loading

The explosive reaction degree and protection from explosions are concerns in the military field.In this work,the reaction degree of the composition B explosive was investigated experimentally.Multi-layered compound structures were used as barriers to weaken the blast loads.A comprehensive experiment using a high-speed camera and image processing techniques,side witness plates,and bottom witness plates was presented.Using the experimental fragment velocities,fragment piercing patterns,and damage characteristics,the reaction degree of the explosive impeded by different multi-layered com-pound structures could be precisely differentiated.Reaction parameters of the explosive obstructed by compound structures were obtained by theoretical analysis and numerical simulations.Unlike the common method in which the explosive reaction degree is only distinguished based on the initial pressure amplitude transmitted into the explosive,a following shock wave reflected from the side steel casing was also considered.Different detonation growth paths in the explosive formed.Therefore,all these shock wave propagation characteristics must be considered to analyze the explosive response impeded by compound structures.     

Visual-attention gabor filter based online multi-armored target tracking

The multi-armored target tracking (MATT) plays a crucial role in coordinated tracking and strike. The occlusion and insertion among targets and target scale variation is the key problems in MATT. Most state-of-the-art multi-object tracking (MOT) works adopt the tracking-by-detection strategy, which rely on compute-intensive sliding window or anchoring scheme in detection module and neglect the target scale variation in tracking module. In this work, we proposed a more efficient and effective spatial-temporal attention scheme to track multi-armored target in the ground battlefield. By simulating the structure of the retina, a novel visual-attention Gabor filter branch is proposed to enhance detection. By introducing temporal information, some online learned target-specific Convolutional Neural Networks (CNNs) are adopted to address occlusion. More importantly, we built a MOT dataset for armored targets, called Armored Target Tracking dataset (ATTD), based on which several comparable experiments with state-of-the-art methods are conducted. Experimental results show that the proposed method achieves outstanding tracking performance and meets the actual application requirements.     

武器装备全寿命费用宏观控制的系统动力学模型

以武器装备作战能力差距为牵引,以全寿命周期阶段对作战能力的影响为主要依据,建立了基于系统动力学的武器装备全寿命费用控制分析模型,客观、合理地描述了全寿命周期各阶段之间的相互影响,并对武器装备全寿命费用宏观费用控制问题进行了仿真实验分析。     

油料火灾爆炸模拟实验系统与测试技术

针对受限空间油料火灾爆炸发生、发展、控制、抑制实验的需要,研制了一系列模拟实验台架及关键参数测试系统。所研制的一系列模拟实验台架为各种工况的油料火灾爆炸模拟实验研究提供了完备的科研条件和支撑;研制的超动态数据采集与分析系统能对冲击波压力、瞬时温度、火焰识别、爆燃向爆轰演化(DDT)过程等进行连续捕捉、测试、分析;研制的基于紫外火焰探测、数字信号处理和网络化智能探测技术的油气爆炸火焰传播速度测试系统较传统的火焰传感器具有高灵敏度、零误报、探测距离远的特点。     

基于CAN总线的指挥车电源管理系统设计

指挥车上的用电设备多,对供电品质要求高,传统的电源管理系统已无法满足系统的要求。设计了一种以数字信号处理器(DSP)和单片机为控制核心,采用CAN总线进行通讯的电源管理系统。系统采用模块化的设计思想,实现了系统关键部件的可换性,拓展了电源系统的工作条件;采用各种可靠性设计方法有效地抑制电网波动,改善电磁环境,提高系统供电品质和可靠性,为指挥车辆电源管理系统设计提供了一种可行的方案。     

潜艇应用的C3I系统作战效能分析

为了定量分析C3I系统对潜艇作战的影响,运用了层次分析法(AHP)和模糊综合评判法对C3I系统在潜艇上应用的作战效能进行分析,结果表明,C3I系统能极大提高潜艇的作战能力,但在C3I系统的发挥重要作用的同时,指挥员的决策能力的高低是影响潜艇战斗力的关键因素。     

Metastases: Exploring the impact of foreign fighters in conflicts abroad

This article examines the historical impact of foreign fighters and how the international community has sought to counter this threat. It argues that foreign fighters have contributed significantly to the metastasis of Salafi-jihadism over the past 30 years. They have globalized local conflicts. They have brought advanced skills to battlefields. Further, the logistics infrastructure built by foreign fighters has allowed Salafi-jihadism to expand rapidly. The challenge for security officials today is how to prevent the foreign fighters in Syria and Iraq from expanding the threat of Salafi-jihadism further. To inform this effort, this article derives lessons learned from past efforts against Arab Afghans in Bosnia (1992–1995) and Abu Musab al-Zarqawi’s foreign volunteers in Iraq (2003–2008).     

军用车辆轮毂电机位置传感器故障检测及容错控制

针对电传动装甲车辆恶劣工况下轮毂电机位置传感器容易产生故障问题,基于脉振高频电压注入法构建了位置传感器故障检测及容错控制系统.通过分析故障时位置传感器输出信号出现的幅值不平衡故障或正交不完全故障,采用阈值检测法实现故障检测,并使电机由有位置传感器控制切换为无位置传感器控制.仿真及实验结果表明,故障发生时,系统能够迅速检测出故障并进行容错控制,有效抑制了电机转速及定子电流的持续振荡.     

On the timing of adoption of multiproduct technologies

This article examines a game of multiproduct technology adoption. We consider a duopoly model in which firms choose when to switch from a traditional single-product technology to a more flexible and more expensive multiproduct technology. The multiproduct technology allows a firm to invade the other firm's market, creating a more competitive environment and reducing profits. We analyze this investment decision as a game of timing using two different equilibrium concepts. First, we utilize the “silent” equilibrium concept, where firms commit at time zero to a switching time. This concept would be applicable to situations where firms cannot observe each other's actions, or when the implementation of the technology requires long lead times and the investment decision is private information. Using this notion we find that both firms adopt the multiproduct technology simultaneously within a certain time interval. We then characterize this time interval in terms of cost and demand conditions. We also derive conditions under which sequential adoption of the multiproduct technology occurs. The second concept used is that of noisy equilibrium, where firms cannot precommit themselves to an adoption time. This concept is appropriate when investment decisions are common knowledge. In this case a firm can credibly threaten to immediately follow suit if the other firm decides to adopt. This threat is sufficient to ensure the collusive outcome where neither firm adopts the flexible technology. © 1994 John Wiley & Sons, Inc.     

基于PROTOBUF的火力指挥报文编解码的研究与实现

传统的火力指挥信息系统传输时采用固定格式的报文。固定的报文格式虽然容易实现,但是大量的冗余信息会占用本以受限的带宽。为了解决该问题,提出了基于PROTOBUF的编解码方法。该方法同对象化的编解码、可变报文格式(VMF)编解码方法相比,能有效提高编解码的效率,也更加契合火力指挥战术报文的使用。最终实验结果也证明了本方法的有效性。