Thermal and combustion behavior of Al-MnO2 nanothermite with poly(vinylidene fluoride -co- hexafluoropropylene) energetic binder

Fluoropolymers get increasing attention in energetic materials application due to the high fluorine content. To explore the effect of poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) on Al/MnO2 nanothermite, the samples with different contents are prepared and characterized by SEM, TG-DSC, XRD, and their ignition and combustion behavior are tested and recorded. The results show that P(VDF-HFP) as an energetic binder can combine the nanothermite components together, even exist in the gaps. The integrity of energetic materials has been improved. Thermal analysis shows that the addition of P(VDF-HFP) greatly changes the thermal reaction processes, and the exothermic peaks appear early, but the utilization of fuel and oxidizer is not efficient from the XRD results. Furthermore, the appropriate addition of P(VDF-HFP) can directly reduce the ignition energy threshold and increase the combustion time, which is necessary for the potential ignition charge application. The possible reasons for above phenomena are discussed and analyzed. This research provides a reference for improvement of thermite-based ignition charge formulation.     

边界扫描测试中簇测试交迭置入方案研究

针对电路板边界扫描测试中簇测试时间较长、测试效率较低问题 ,以并行测试思想为基础 ,提出了一种簇测试置入方案———交迭置入方案 ,并对其进行了理论分析和实验验证。结果表明 ,该方案是最优的簇测试置入方案 ,可以显著减小簇测试时间 ,提高簇测试效率     

边界扫描测试信息压缩算法

为了解决 IEEE 1 1 49.1边界扫描测试优化生成问题 ,提出了一种新型的测试矩阵压缩算法。该算法首先应用被测试电路板的结构信息构造有限制的短路故障模型 ,然后以有限制的短路故障模型为基础对测试矩阵进行压缩处理 ,尽可能剔除测试矩阵中的无效测试信息 ,从而达到测试优化生成的目的。理论分析及实验验证表明 ,该算法能够获得紧凑性指标相当优化的测试矩阵 ,实现较高的测试信息压缩率     

可测试性技术中的图论问题及其求解

近 2 0年来 ,为了解决结构日益复杂的电路测试问题 ,可测试性技术得到了迅速发展。在可测试性技术中 ,针对不同的测试对象 ,如何对可测试性设计方案以及测试策略进行优化 ,降低总体代价 ,是亟待解决的问题。为了解决这两类典型的优化问题 ,首先应用图论方法建立问题的拓扑描述模型 ,然后通过构造相应的逻辑求解函数 ,给出问题最优解的求解算法 ,并通过简单实例演     

绿洲农业清洁生产初探

兵团农业是兵团国民经济的基础。随着兵团各农牧团场生产集约化程度不断提高,化肥、农药等在农业生产中大量投入及农业生产技术的不合理使用,使农业生态环境污染日趋严重,改善农业生产技术,推广农业清洁生产(即利用对环境友好的“绿色”化肥、“绿色”农药、“绿色”薄膜)是兵团农业可持续发展的方向。     

硬脆材料的缓进给半塑性化磨削

分析了用缓进给方法实现硬脆材料半塑性化磨削的机理，提出了衡量半塑性化磨削效果的破碎率指标，介绍了实验方法和实验结果，对实验结果进行了分析比较。实验结果表明，在普通磨床上可实现硬脆材料的半塑性化磨削，采用缓进给磨削方法可以显著地提高半塑性化磨削的效果。     

边界扫描测试的数学描述模型

IEEE1149.1边界扫描机制是一种新型的VLSI电路测试及可测试性设计的有效方法,为了高效地应用边界扫描机制对电路系统进行测试,必须对其所涉及的理论方法进行深入探讨。本文应用布尔矩阵理论建立起边界扫描测试的数学描述模型,并基于所建立的模型导出了边界扫描测试中的故障检测条件和故障隔离条件。为边界扫描测试生成算法的深入研究奠定了理论基础。     

Performance analysis of the cultural and creative industry: a network‐based approach

The cultural and creative industries (CCIs) in Taiwan have gradually contributed to the national economy under the impetus of government policies. We employ a two‐stage data envelopment analysis model with an additive efficiency decomposition approach to measure the profitability and marketability of 22 Taiwanese cultural and creative companies. Furthermore, we employ the network‐based ranking approach to identify benchmark inputs/outputs, and the strengths and weakness of each company. Our empirical results show that the profitability of the cultural and creative companies is better than their marketability. Companies in the industries of publishing, creative life, popular music, and cultural content averagely perform better than those in the other three types of CCIs in terms of profitability. Companies in the creative life industry are on average more efficient than those in the other five types of CCIs in terms of marketability. The profitability/marketability matrix of cultural and creative companies is also presented.     

三种坦克变速箱润滑油的试验研究

按GB/T12583—90标准,对三种坦克变速箱润滑油（50号机油,80号坦克齿轮油和18号双曲线齿轮油）进行实验室和实车评定。选择变速箱四档主动齿轮齿厚最大磨损部位磨损速率作为评定润滑油润滑效果优劣的判据:通过三台59式坦克近300摩托小时的实车试验,测定了分别采用三种润滑油的齿厚磨损速率,得出了18号双曲线齿轮油的使用性能最好,80号坦克齿轮油次之,50号润滑油最差的结论,为部队合理使用坦克变速箱润滑油提供了依据。     

大型动力装置运行状态监测系统硬件实现

针对大型动力装置分布广、运行状态参数多以及结构复杂等特点,本文提出了一套实用的大型动力装置运行状态监测系统硬件实现方案。该系统按主从分布式结构设计,采用前置放大、滤波、隔离等先进技术,有效地抑制了各种噪声、干扰,达到了信号提纯的目的,为后续状态监测及故障的深层诊断提供了可信的原始数据。