基于金属熔流的未爆弹药销毁技术研究进展

结合未爆弹销毁作业的特点,分析常用销毁方法的适用范围,将烟火切割技术应用于弹药销毁作业,介绍了一种引燃非引爆的销毁方法。概述了金属熔流销毁技术的原理,梳理了燃烧剂配方和燃烧炬结构的研究现状,分析了燃烧剂体系配比,添加剂成分和燃烧炬结构对金属熔流的作业时间、熔穿金属效率、效果的影响。对比文献资料,采用火箭发动机型燃烧炬和利用高热剂、合金剂、稀释剂和造气剂优化燃烧剂,更有利于未爆弹药的销毁。并为下一步深入研究基于金属熔流的弹药销毁技术提供参考。     

铝粉粒径对销毁某未爆弹药影响的试验研究

为提高某种新型未爆弹销毁方式的工作效能和操作安全性,基于销毁装置内复合高热剂自蔓延燃烧过程,利用试验分析研究了铝粉粒径大小对销毁该种未爆弹药的影响。结果表明:74~178μm范围内,铝粉粒径越大,金属熔流出口速度达到的峰值越低;同时,铝粉粒径过小(≤89μm),会导致销毁装置内复合高热剂反应过于激烈,容易出现燃爆现象;而124~178μm粒径范围的铝粉适用于榴弹弹丸、破甲弹战斗部、手榴弹、地雷等多种壳体厚度不超过9 mm的猛炸药弹丸的未爆弹销毁工作。为以后提高未爆弹销毁工作效能、保护销毁人员安全提供参考。     

大批量废旧弹药爆破销毁技术的应用

介绍了南京市废旧弹药销毁的整个过程。对弹药进行鉴别分类,确定销毁的实施方法,并对销毁场地进行考察核实;提出废旧弹药装载和运输的注意事项;确定销毁方案的主要技术参数,计算校核爆破振动安全、破片和冲击波的安全距离。经过精心设计和组织,销毁取得圆满成功,可为类似工作提供有益的经验。     

被覆爆炸法——销毁常规废旧弹药的技术

针对销毁废旧弹药工作次数频繁、弹药种类繁多、数量较大及危险程度高的问题,在比较国内外常规销毁方法的基础上,结合实际销毁工作经验,总结提出了一种销毁方法——被覆爆炸法。通过选择远离各类建筑物和设施且松散性较好的沙土地作为销毁地点,采用人工或机械开挖凹坑,将待销毁的废旧弹药放入坑内,同时堆放过程中在底层、中层、顶层充填炸药和起爆药包,然后将沙土回填,可一次性销毁数量较大的废旧弹药。总结归纳了被覆爆炸法的销毁流程、适用对象及安全技术措施,可为销毁常规废旧弹药提供参考。     

被覆爆炸法——销毁常规废旧弹药的技术

针对销毁废旧弹药工作次数频繁、弹药种类繁多、数量较大及危险程度高的问题,在比较国内外常规销毁方法的基础上,结合实际销毁工作经验,总结提出了一种销毁方法——被覆爆炸法。通过选择远离各类建筑物和设施且松散性较好的沙土地作为销毁地点,采用人工或机械开挖凹坑,将待销毁的废旧弹药放入坑内,同时堆放过程中在底层、中层、顶层充填炸药和起爆药包,然后将沙土回填,可一次性销毁数量较大的废旧弹药。总结归纳了被覆爆炸法的销毁流程、适用对象及安全技术措施,可为销毁常规废旧弹药提供参考。     

基于预处理方法的空化超空化流数值模拟

建立了一套水动力空化流数值计算方法,采用基于预处理方法的空化两相流模型计算二维空化问题,并通过添加源项来计算轴对称外型空化问题,发展了类比于Roe格式的空化两相流通量计算迎风格式,湍流模型采用经过修正的相似文献   

基于心流理论的产品交互设计研究综述

目的 目前心流理论主要应用在教育教学及计算机等方面,在产品交互设计领域的研究还处于探索阶段,有必要分析心流理论的交互设计适用性,提出基于心流理论的产品交互设计方法。方法 通过文献研究法、归纳法,梳理心流理论的国内外研究进展,分析心流交互体验的实际验证方法,从产品角度提出心流理论在交互设计中的应用方式,对心流理论在产品交互设计中的启发性原理进行总结。结论 心流是一种积极情绪的体验,在适当情境下能够提升用户体验。通过建立清晰的用户目标、维系挑战与技能的提升、给予有效的操作反馈三个主要方面,对基于心流理论的产品交互设计方法进行拓展,丰富产品交互设计与心流理论相结合的理论空间,为产品交互设计方法研究提供参考。     

基于心流理论的互联网产品设计研究

目的着力于创造能够产生心流体验的互联网产品。方法基于认知心理学的心流理论的研究分析,提出为用户提供明确而清晰的目标,适时有价值的反馈,与技能平衡的挑战,流畅的操作和舒适的界面等交互设计方法和指导思路,并将其应用于百度微拍实际项目中。结论提升了用户的使用体验,拓展了互联网产品设计与心流理论结合的理论空间。     

油气水三相流自动计量技术的研究进展和应用前景

阐述了三相流（油气水）计量技术在油田开发中应用的意义,综述了三相流计量技术研究的发展概况,并将国内外多种三相流计量技术进行了比较,探讨了该技术在我国应用前景。     

基于MRMHC-LSVM的IP流分类

提出了一种构建轻量级的IP流分类器的wrapper型特征选择算法MRMHC-LSVM.该算法采用改进的随机变异爬山(MRMHC)搜索策略对特征子集空间进行随机搜索,然后利用提供的数据在无约束优化线性支持向量机(LSVM)上的分类错误率作为特征子集的评价标准来获取最优特征子集.在IP流数据集上进行了大量的实验,实验结果表明基于MRMHC-LSVM的流分类器在不影响分类准确度的情况下能够提高检测速度,与当前典型的流分类器NBK-FCBF相比,基于MRMHC-LSVM的IP流分类器具有更小的计算复杂度与更高的检测率.     

Numerical and experimental studies on nozzle two-phase flow characteristics of nanometer-scale iron powder metal fuel motor

Metal iron powder is a promising new type of energy source that is of enormous practical and research interest for future automotive power systems. To better optimize engine design, this study was devoted to the characteristic investigation of a two-phase flow. Experimental studies involving nanometer iron powder particle combustion and engine thrust measurement were conducted to confirm the results obtained from numerical calculations that were performed using a fourth-order Runge–Kutta–Gill method. Governing equations for nozzle two-phase flow were established to perform a theoretical study to analyze the combustion properties of iron oxide particles and flow in the nozzle. The results indicate that variations in the size and coagulation content of particles play a significant role in the loss of two-phase flow. Significant emphasis was placed on the effect of particle size (0.4–1.0?μm) and condensate content (10–40%) of ultrafine particles on the specific impulse. To further validate the theoretical results, the burning rates of particles of three different sizes were experimentally measured. In addition, the motor thrust and the specific impulse with the particle size of 50?nm were tested through combustion experiment, and the results show excellent agreement.     

基于部分面积法的流量计算仪设计

河流流量和流速测量是水利测量的基础工作,然而设计测量精确而又使用方便的仪器比较困难。本文改进了部分面积法,适用于河流流量测量仪器的设计：介绍了采用单片机开发的便携式流量计算仪,提出该装置的硬件原理和组成,并讨论用于实现信号采集、流速和流量处理的软件设计方法。经实验验证本装置具有实用价值。     

Fabrication of nano-sized metal patterns on flexible polyethylene-terephthalate substrate using bi-layer nanoimprint lithography

Polymer films are widely used as a substrate for displays and for solar cells since they are cheap, transparent and flexible, and their material properties are easy to design. Polyethylene-terephthalate (PET) is especially useful for various applications requiring transparency, flexibility and good thermal and chemical resistance.In this study, nano-sized metal patterns were fabricated on flexible PET film by using nanoimprint lithography (NIL). Water-soluble poly-vinyl alcohol (PVA) resin was used as a planarization and sacrificial layer for the lift-off process, as it does not damage the PET films and can easily be etched off by using oxygen plasma. NIL was used to fabricate the nano-sized patterns on the non-planar or flexible substrate. Finally, a nano-sized metal pattern was successfully formed by depositing the metal layer over the imprinted resist patterns and applying the lift-off process, which is economic and environmentally friendly, to the PET films.     

基于有限元的能量流分析方法研究

区别于传统的统计能量分析,通过对有限元方法计算结果的后处理也可进行能量流分析。为提高计算效率,分析过程中对某些与频率相关的积分进行了推导简化。在此基础上,以Matlab为平台编写了相关计算程序。而后,对具体算例进行基于有限元的能量流分析并与统计能量分析的结果进行比较。最后,基于此算例进一步对基于有限元的能量流分析方法进行改进并对相应的计算程序进行优化提高计算效率。     

金属橡胶可变形材料三维参数化实体建模研究

金属橡胶可变形材料内部不锈钢丝的勾连结构对其减振、过滤、吸声降噪等性能都有重要影响,MR材料的制备主要依赖于经验参数和多次尝试的方法,极大地限制了此种新材料的推广应用,为了实现此类新材料的参数化设计,提出了基于CAD技术对MR材料进行三维结构建模的方法,利用AutoCAD的二次开发工具ObjectARX,开发了交互式参数化设计的应用程序,该程序以离散和自适应算法重点解决钢丝重叠问题,使得MR三维模型更加真实可靠.研究结果表明:该方法实现了MR材料的参数化设计,可明显缩短产品开发周期,建立的模型可用于统计计算MR材料的固相体积分数和钢丝接触点数以预报预测其性能-结构关系.     

基于DSP-FPGA平台的ADCP高沙流量测量系统

基于TMS320C6748与Spartan-6平台完成声学多普勒流速剖面仪(Acoustic Doppler Current Profiler, ADCP)的设计,并实现高含沙量情况下的水流流量精确测量。数字信号处理模块(Digital Signal Processing, DSP)完成上位机通信、系统控制、现场可编程门阵列模块(Field Programmable Gate Array, FPGA)交互、外设数据接入、信号数据处理等功能,FPGA完成发射信号调制、接收信号采集等功能。利用测量船搭载ADCP高沙流量测量系统在黄河流域进行测量,ADCP接入全球定位系统(Global Positioning System, GPS)和测深仪数据,在高含沙量水域进行断面流量测试,验证系统的可行性及测量精度。结果显示,在含沙量达到15.5 kg·m-3的水文环境下,ADCP系统可正常稳定地完成测量作业,测量得到的流量相对误差为1.01%,满足高精度流量测量系统的要求。     

Numerical modeling and simulation of pulsatile blood flow in rigid vessel using gradient smoothing method

Computer modeling and simulation is an effective tool to investigate, analyze, and understand the homodynamic, mechanical behavior of blood flow. The detailed information on shear stress, pressure drops, recirculation, stagnation, and turbulence can be applied in the medical practice to establish a direct linkage between flow characteristic and disease. In this paper, a novel gradient smoothing method is proposed to simulate the blood flow in the common artery, vessel with stenosis, and abdominal aortic aneurysm. Compared with the standard finite volume method, the gradient smoothing method is originated from the gradient smoothing operation to approximate the spatial derivatives at various locations based on irregular cells regardless its physical background. The dual time stepping scheme and point-implicit five-stage Runge-Kutta (RK5) method are implemented to enhance the efficiency and stability in iterative solution procedures. The numerical results have demonstrated that the model obtained from gradient smoothing method is more accurate than the standard finite volume method using commercial software of Fluent.     

Deposition and STM characterization of luminescent organic molecules on metal substrates

The porphyrin-based molecules including H₂TBPP, ZnTBPP and P_tTBPP as well as the perinone derivatives (PD) molecules were deposited on Au(100), Au(111) and Cu(100) substrates in the form of single molecule, molecular line, submonolayer, monolayer and multilayer. The features of the performed molecular nanostructures were characterized by an ultrahigh vacuum scanning tunneling microscopy (STM) at room temperature. The observed molecular topographies matched very well with the molecule structures in spite of the fact that the molecular adsorption states were influenced by different metal surface. STM-induced photon emission was generated from the surface of H₂TBPP multilayer structures on Au(100) in tunneling junction when the applied bias exceeds the “turn-on” voltages ∼− 1.6 V or + 1.3 V at 0.5 nA.