具连续分布滞量的二阶中立型阻尼偏微分方程解的振动准则

研究一类具有阻尼项和连续分布滞量的二阶中立型偏微分方程解的振动性,通过利用Riccati变换,引入一类Φ(t,s,l)型的新函数,获得该类方程在Robin,Dirichlet边值条件下振动的充分判据.     

基于0-1规划的弹种决策与发射时序优化

对于身管发射武器系统,同一发射单元使用不同弹种完成作战任务时,需要确立合适的弹种决策与最佳的发射时机.提出用O-1变量来描述弹种决策变量.通过时弹种发射机制及武器系统控制特点进行分析,构造多种0-1变量用以描述武器系统作战时序之间的约束关系,建立了弹种发射时序的0-1规划模型,并用LINGO软件实现了0-1规划的求解.给出了典型应用实例,进行了仿真计算,结果表明,该方法简单可行.     

结构化装备型号需求论证模式研究

结构化是系统工程分析问题的重要手段。为给装备型号需求论证工程化提供理论依据与技术支撑,对结构化装备型号需求论证模式的相关问题进行了研究。分析了装备型号需求论证流程,界定了装备型号需求论证工作范围,明确了装备型号需求论证的内部流程和外部边界;针对一体化联合作战要求,提出了有指导性的需求论证策略,确保结构化装备型号需求论证模式的科学性;借鉴美军体系结构技术,构建了结构化装备型号需求论证空间,对整个论证空间的结构设计、论证域的划分和各论证环节的论证任务进行了深入研究,从技术角度实现了需求论证过程的结构化。     

串联式反后坐装置设计与动力学仿真

利用Runge-Kutta方法确定了火炮串联式后坐系统的参数,设计出串联式反后坐装置结构,并运用ADAMS软件进行了串联式后坐系统动力学仿真,以验证设计结果的准确性。动力学仿真结果与结构设计的参数比较吻合,证明了结构设计结果的准确性,通过串联式后坐系统与单一后坐系统的对比,反映了串联式后坐系统的优越性。     

Statistical analysis for masked system life data from Marshall‐Olkin Weibull distribution under progressive hybrid censoring

This paper considers the statistical analysis of masked data in a series system, where the components are assumed to have Marshall‐Olkin Weibull distribution. Based on type‐I progressive hybrid censored and masked data, we derive the maximum likelihood estimates, approximate confidence intervals, and bootstrap confidence intervals of unknown parameters. As the maximum likelihood estimate does not exist for small sample size, Gibbs sampling is used to obtain the Bayesian estimates and Monte Carlo method is employed to construct the credible intervals based on Jefferys prior with partial information. Numerical simulations are performed to compare the performances of the proposed methods and one data set is analyzed.     

The human consequences of foreign military intervention

The empirical international conflict literature has given much recent attention to interstate armed force’s impact on human well-being. While empirical research has advanced our understanding of the phenomenon considerably, we argue that one conclusion that many studies have reached is preliminary. Some recent research contends that only full-scale war, and not force short of war, has a discernable impact on human welfare or physical quality of life (PQOL). We develop theory on one type of force short of war, large-scale foreign military intervention (FMI), and its potential effects on PQOL. Using interrupted time series and panel corrected standard error methodologies, we find that from 1960 to 2005 large-scale FMI had a statistically and substantively significant impact on the PQOL of populations in 106 developing countries. The specific effect that this type of armed force has depended in large part on the regime type of the target country.     

撬装式LNG加气站消防安全设计探析

撬装式LNG加气站简便、灵活,具有易燃易爆危险性、工作环境特殊性等特点。目前关于撬装式LNG加气站没有明确的国家规范,因此探讨其消防安全设计至关重要。介绍了撬装式LNG加气站的优势,应用系统的思想方法,从总平面布局、防火间距、建（构）筑物设计、工艺安全设计、设置控制报警系统、电气安全设计、给排水系统设计、灭火器配置等方面探讨了撬装式LNG加气站的消防安全设计,为该种加气站的发展提供安全保障。     

Military expenditure and economic growth: peru 1970–1996

The present study examines the effects of military expenditure on growth in Peru in the period from 1970 to 1996. By using a Deger‐type Simultaneous Equations Model it is possible to break up the net effect into supply‐ and demand‐side influences. The former consist of positive externalities of defence activities on the other sectors of the economy, while the latter can be described as crowding‐out of civilian investment. Estimations find the supply‐side effects to be insignificantly different from zero, while the crowding‐out effect of defence spending is significant and substantial. It is thereby established that defence expenditure has a negative overall effect on economic growth in Peru. Although several caveats – including specification problems of the Deger model, the quality of the data used, a relatively small sample and the presence of autocorrelation in the estimations – must be considered, these results turn out to be quite robust with respect to estimation methods (3SLS, 2SLS, OLS) and slight modifications to the model. They are also consistent with previous empirical findings from other countries and cross sectional studies.     

基于Matlab四杆式液压起落机构运动学与动力学分析

提出了一种可用于加油卷盘升降的四杆式液压起落机构的设计方案。分析了四杆式液压起落机构的工作原理,采用复数向量法建立了运动学和动力学数学模型。利用Matlab软件编制了相应的程序进行实例分析和计算,得到了机构关键点的仿真轨迹和有关构件的角位移、角速度及角加速度曲线。运用理论分析计算和软件仿真,验证了机构设计的合理性和方案的可行性。     

D0影响亚硝酸型SND工艺的机理探讨

亚硝酸型SND污水生物脱氮新工艺因兼具短程硝化和同时硝化反硝化工艺的优势而具有很强的开发潜力。在介绍亚硝酸型SND工艺特点之后,着重从微环境理论、微生物特性及化学计量学等角度较为深入地探讨了溶解氧浓度(DO)影响亚硝酸型SND工艺脱氮效果的机理,从理论上进一步证实了DO对于亚硝酸型SND工艺的重要性。