消防行政强制执行代履行制度研究

根据《消防法》和《消防监督检查规定》,结合公安消防机构的行政执法特点,针对代履行制度的定义及其法律关系进行分析论证,提出了符合公安消防机构行政执法特点的代履行实施程序。     

智能水雷主动干扰方法研究

针对传统的扫雷方法在清除智能化水雷引信方面存在的不足,分析了利用主动干扰信号反水雷的思路,通过分析智能引信的工作机理及在干扰背景下对目标信号的检测能力,建立了基于奈曼-皮尔逊准则的主动干扰反水雷模型.针对水雷磁引信,选择电极式电磁扫雷具为干扰源,以中型舰船为保护对象,通过计算三者的相互位置与信噪比的关系,以及水雷检测出...     

四足机动平台的静步态规划研究

基于仿生学原理进行了四足机动平台的腿部结构设计,分析了负载因子、周期、步距等步态设计参数对静步态稳定性的影响,提出了平地直行条件下从起步到稳定行走的步态调整方式,并对静步态行走全过程的稳定裕度进行了求解。计算结果表明：所规划的行走步态能达到静步态运动稳定性要求。     

先张预应力BFRP筋混凝土梁受弯性能试验研究

玄武岩纤维筋是一种新型复合材料,具有轻质、高强、非磁性、耐高温、耐酸碱等多重优点.完成了直径为10 mm的BFRP筋基本力学性能测试.进行了3根先张有粘结预应力BFRP筋混凝土梁,1根非预应力BFRP筋混凝土梁的受弯性能对比试验,分析了试验梁受力过程及破坏形态、平截面假定情况、特征荷载值、荷载--挠度关系、裂缝发展情况...     

水面舰艇攻势防御的效能评估及优势论证

进攻是最好的防守。针对水面舰艇攻势防御问题,对水面舰艇攻势防御的概念及使用前提进行了讨论,通过与守势防御的比较,从理论上对攻势防御的优势进行了论证。最后,根据论证结果、数据仿真及作战实际,给出了攻势防御的使用原则。     

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.     

Effect of metal powders on explosion of fuel-air explosives with delayed secondary igniters

In order to improve the energy level of fuel air explosive(FAE) with delayed secondary igniters, high energetic metal powders were added to liquid fuels mainly composed of ether and isopropyl nitrate. Metal powders' explosive properties and reaction mechanisms in FAE were studied by high-speed video, pressure test system, and infrared thermal imager. The results show that compared with pure liquid fuels, the shock wave overpressure, maximum surface fireball temperature and high temperature duration of the mixture were significantly increased after adding high energetic metal powder. The overpressure values of the liquid-solid mixture at all measuring points were higher than that of the pure liquid fuels. And the maximum temperature of the fireball was up to 1700 ℃, which was higher than that of the pure liquid fuels. After replacing 30％of aluminum powder with boron or magnesium hydride, the shock wave pressure of the mixture was further increased. The high heat of combustion of boron and the hydrogen released by magnesium hydride could effectively increase the blast effect of the mixture. The improvement of the explosion performance of boron was better than magnesium hydride. It shows that adding high energetic metal powder to liquid fuels can effectively improve the explosion performance of FAE.     

Research on fuze microswitch based on corona discharge effect

Abnormal voltages such as electrostatic, constant current, and strong electromagnetic signals can erro-neously trigger operation of MEMS pyrotechnics and control systems in a fuze, which may result in casualties. This study designs a solid-state micro-scale switch by combining the corona gas discharge theory of asymmetric electric fields and Peek's Law. The MEMS switch can be transferred from "off" to"on" through the gas breakdown between the corona electrodes. In the model, one of the two electrodes is spherical and the other flat, so a non-uniform electric field is formed around the electrodes. The theoretical work is as follows. First, the relation among the radius of curvature of the spherical electrode, the discharge gap, and the air breakdown voltage is obtained; to meet the low voltage (30-60 V) required to drive the MEMS switch, the radius of curvature of the spherical electrode needs to be 10-50 μm and the discharge gap between the two electrodes needs to be 9-11 μm. Second, the optimal ratio ε is introduced to parameterize the model. Finally, the corona discharge structural parameters are determined by comparing the theoretical and electric field simulation results. The switch is then fabricated via MEMS processing. A hardware test platform is built and the performing chip tested. It is found that when the electrode gap is 9 μm, the electrostatic voltage is at least 37.3 V, with an error of 2.6% between the actual and theoretical air breakdown voltages. When the electrode gap is 11 μm, the electrostatic voltage is at least 42.3 V, with an error of 10.5% between the actual and theoretical air breakdown voltages. Both cases meet the design requirements.     

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.     

舰空导弹防空体系分析

从舰空导弹武器作战任务的需求出发,分析了舰空导弹体系的组成,给出了评估体系优劣的指标。简要回顾了国外舰空导弹武器的发展,阐述了美、俄、英等国家舰空导弹体系的构成,并展望了舰空导弹发展趋势。