载人航天器防火安全设计

防火安全是载人航天器总体设计所关注的重点项目之一。文章按照火灾发生三要素,结合以往密封舱防火安全设计经验,从密封舱内可燃物控制、舱内氧浓度控制、防止点火源形成、防止火灾传播、密封舱烟火监测和密封舱灭火6个方面对载人航天器防火安全设计方法进行了归纳总结。该研究可为我国后续载人航天器密封舱防火设计提供重要依据,确保载人航天器任务期间的安全可靠性。     

某型飞机火控系统故障诊断测试仪的设计

针对某型战机火控系统在维护保障上存在检测仪器功能单一、通用性差、检测效率低、可靠性不高等问题,研制了基于故障树分析法与专家系统相结合的某型飞机火控系统故障诊断测试仪.文中以火控系统不工作为顶事件,建立了故障树,并对故障树作了定性分析.该测试仪有效克服了机载火控系统故障诊断中传统的数据采集、分析、处理及决策控制方法的不足,结果表明,故障树分析法是机载火控系统故障诊断的一种有效方法.     

Quasi-periodicities in cosmic rays recorded by the KACST muon detector during 2002–2012

In this study, daily cosmic ray data obtained with the KACST muon detector for the period 2002–2012 were analyzed for quasi-periodicities. Power-spectrum analysis was carried out and several periodicities were identified. The results reveal several periodicities at different frequency scales: 817 days (~2.19 years), 617 days (~1.7 years), 475 days (~1.3 years), 421 days (1.15 years), 290 days (~0.8 years), 227 days (~0.62 years), 185 days (~0.52 years), 153 days, 135 days, 120 days, 93 days, 84 days, 73 days, 65 days, 53–45 days, 38 days, 31 days, 25–27 days, 21 days and 13 days. The obtained periodicities are in an agreement with those previously reported by several investigators.The identified periodicities have strong relevance to solar activity parameters such as variations in the interplanetary magnetic field.In comparison, the data from two neutron monitors (NMs), Lomnický ?tít and Oulu NMs, for the same period were used and their power spectra were correspondingly obtained. Similarities and differences in the position of the cosmic-ray peaks measured by the KACST muon detector and by the two NMs have been presented and discussed. While most of the periodicities reported by the muon detector are also found in the NM data, the ~1.7-yr variation is not found. Instead, a shift of 1.6–1.8 years in the NM data is observed which may be due to the limited epoch considered in this study.     

消防监督检查实践教学模式的探究

开展消防监督检查实践教学应立足消防院校实际情况，面向部队工作需要，采取校内白检、校外体验、实习实训三种实践教学模式，形成具有消防院校特色实践教学体系。通过建设教学实践基地、改革实习方式、改善实践教学环境、建设“双师型”教师队伍等措施，不断提高消防监督检查实践教学的实效性，切实提高学员实际动手能力和独立开展消防监督检查的工作能力，努力为部队培养合格消防人才。     

人工免疫木马检测中动态克隆选择算法的改进

针对人工免疫木马检测中检测器的冗余,检测过程中成熟检测器和记忆检测器在检测到自我抗原或年龄过大时,被直接删除造成的非我信息资源丢弃等问题,引入限次变异对检测器的生成进行改进,提出将随机生成的检测器在自我耐受后,再与已有合格检测器匹配,对与已有合格检测器匹配的检测器进行限次变异;而检测到自我抗原或年龄过大的检测器同样进行限次变异的方法。实验结果表明,这种方法能准确而快速地检测已知和未知木马。     

Optimum detection and location estimation of target lines in the range-time space of a search radar

The average likelihood ratio detector is derived as the optimum detector for detecting a target line with unknown normal parameters in the range-time data space of a search radar, which is corrupted by Gaussian noise. The receiver operation characteristics of this optimum detector is derived to evaluate its performance improvement in comparison with the Hough detector, which uses the return signal of several successive scans to achieve a non-coherent integration improvement and get a better performance than the conventional detector. This comparison, which is done through analytic derivations and also through simulation results, shows that the average likelihood ratio detector has a better performance for different SNR values. This result is justified by showing the disadvantages of the Hough method, which are eliminated by the optimum detector. To have an estimate for the location of the detected target line in the optimum detection method as the Hough method, which detects and localizes the target lines simultaneously, we present the maximum a posteriori probability estimator. The estimation performance of the two methods is then compared and it is shown that the maximum a posteriori probability estimator localizes the detected target lines with a better performance in comparison with the Hough method.     

运输类飞机发动机短舱火焰防护设计与验证

通过对CCAR-25部运输类飞机发动机短舱火焰防护适航条款的要求进行分析,按照防火、耐火要求将条款内容进行对比,参考美国联邦航空局的咨询通告和修正案,对火焰防护的确定原则、设计要求与验证方法进行了研究,明确发动机短舱内的材料和零部件的防火、耐火要求。     

北京某国际金融大厦风荷载与火灾流场的数值模拟

对北京金融大厦风荷载进行了计算机数值模拟，给出院 风洞中模型表面风荷载随风向角变化的一般规律并和文献[1]的实验结果进行了比较。给出了实验模型周围的流动图画和气流参数的分布规律，另外，分析了构成该建筑的四栋相邻近的建筑之间发生火灾后的流动特性，提出了比其它建筑结构更易于扩大火灾发展的原因和补救措施。     

空空拦射导弹火控系统飞行方案建模与仿真

针对空空拦射导弹火控系统的飞行试验方案建模与仿真,提出了合理的建模假设,建立了一系列关于载机、目标机及导弹在导弹发射前、发射后整个靶试过程中的运动诸元解算模型,分析了飞机运动方程与火控系统攻击需求之间的相对关系,进行了仿真计算,并将仿真计算结果与实际工程试飞应用结果进行了对比,取到了满意的效果.     

用模糊数学方法评价灭火作战

本文分析了影响灭火战斗的因素，并采用模糊数学方法对灭火战斗进行评价。建立了评价模型。对某灭火战斗实例进行了评价。