基于双重酉滤波的再入目标实时跟踪

适当的运动模型和估计方法是提高再入目标跟踪性能的关键.选择机动再入动力学模型,将再入目标跟踪问题转化为状态和参数的联合估计问题,并利用试验数据分析了再入模型状态和参数的相关性.针对原始双重酉滤波算法的确定性系统输入假设造成信息损失的局限性,提出了一种基于随机性系统输入假设的改进双重酉滤波算法,并从理论上分析了该算法的估...     

军机进近优先级别评估

针对军机自身状况以及军机进近飞行特点,分析了影响军机进近优先级别的因素,采用灰色关联分析的思想,运用熵值法对这些影响因素进行了量化分析,建立了军机进近优先级别的灰熵评估模型,最后通过程序实现其算法,展示了军机进近优先级别评估的过程,表明该灰熵评估模型在实际的军机进近飞行管理工作中具有一定的应用价值和发展前景.     

登步岛渡海登陆作战经过与思考

1949年10月下旬至11月上旬,中国人民解放军在华东闽、浙沿海有两次激烈的渡海攻占敌岛的战斗,这就是金门岛战斗和登步岛战斗.金门岛进攻作战,系第三野战军第10兵团第28军和第29军各一部登陆金门岛,与国民党军3万余人激战两昼夜,两批登岛部队3个半团9086人,因后援不继,全部覆没.     

美国推动军民融合的发展模式及对我国的启示

本文主要介绍了军民融合的涵义,着重分析了美国推动军民融合的发展模式和我国当前的发展现状,并希望能在此基础之上,借鉴美国的作法,探讨如何加速建设我国的军民融合体系。     

Alleviating time inconsistent behaviors via a competition scheme

Under quasi‐hyperbolic discounting, the valuation of a payoff falls relatively rapidly for earlier delay periods, but then falls more slowly for longer delay periods. When the salespersons with quasi‐hyperbolic discounting consider the product sale problem, they would exert less effort than their early plan, thus resulting in losses of future profit. We propose a winner‐takes‐all competition to alleviate the above time inconsistent behaviors of the salespersons, and allow the company to maximize its revenue by choosing an optimal bonus. To evaluate the effects of the competition scheme, we define the group time inconsistency degree of the salespersons, which measures the consequence of time inconsistent behaviors, and two welfare measures, the group welfare of the salespersons and the company revenue. We show that the competition always improves the group welfare and the company revenue as long as the company chooses to run the competition in the first place. However, the effect on group time inconsistency degree is mixed. When the optimal bonus is moderate (extreme high), the competition motivates (over‐motivates) the salesperson to work hard, thus alleviates (worsens) the time inconsistent behaviors. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 357–372, 2017     

基于集对分析的海上油料补给方法选择优化

针对各种复杂环境对海上油料补给方法选择的不确定性影响,在分析海上油料补给方法选择影响因素的基础上,确定了海上油料补给方法选择的属性要素,运用集对分析理论建立了海上油料补给方法选择的优化模型;采用变异系数法计算属性权重,通过构建海上油料补给方法选择的正、负理想方案,确定了各备选方案与理想方案之间的联系度。算例分析结果表明,将集对分析运用于海上油料补给方法的选择,能够有效降低多种复杂因素对油料补给方法选择的不确定性影响。     

海水集料混凝土抗压强度及配合比试验研究

海水集料混凝土利用球形SAP形成内部球孔,是一种基于内部孔结构的新型混凝土。对水泥用量、球形SAP体积分数、水胶比和复合外加剂质量分数4个因素,各取4个水平进行正交试验,采用极差分析和方差分析归纳各因素对海水集料混凝土抗压强度的影响。结果表明:球形SAP体积分数对抗压强度的影响最大,其次是水泥用量和水胶比,复合外加剂质量分数的影响最小。在正交试验的基础上,将海水集料混凝土中球形SAP体积率视为孔隙率,得到一系列抗压强度的回归关系式,提出基于经验公式的海水集料混凝土配合比设计方法。     

三维均匀化理论预测多孔混凝土等效弹性模量

应用多尺度渐进展开的均匀化理论,推导三维均匀化理论的有限元解法,求解复合材料等效弹性系数。假设多孔混凝土由光滑均匀一致的球孔与水泥石基质组成,提出改进的随机投放方法,生成三维均匀化理论求解的随机单胞模型。以聚苯乙烯泡沫(EPS)混凝土为数值算例,生成6组不同体积分数的EPS混凝土随机单胞模型,通过三维均匀化理论的有限元法计算得到其等效弹性模量。计算结果表明:随机单胞模型能反映细观的非均质性,三维均匀化理论的有限元法计算得到的等效弹性模量变化趋势比较符合Miled的试验结果。     

Layers of Experiments with Adaptive Combined Design

In the field of nanofabrication, engineers often face unique challenges in resource‐limited experimental budgets, the sensitive nature of process behavior with respect to controllable variables, and highly demanding tolerance requirements. To effectively overcome these challenges, this article proposes a methodology for a sequential design of experiments through batches of experimental runs, aptly named Layers of Experiments with Adaptive Combined Design (LoE/ACD). In higher layers, where process behavior is less understood, experimental regions cover more design space and data points are more spread out. In lower layers, experimental regions are more focused to improve understanding of process sensitivities in a local, data‐rich environment. The experimental design is a combination of a space‐filling and an optimal design with a tuning parameter that is dependent on the amount of information accumulated over the various layers. The proposed LoE/ACD method is applied to optimize a carbon dioxide (epet‐CO2) assisted deposition process for fabricating silver nanoparticles with pressure and temperature variables. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 127–142, 2015     

单晶硅反射镜激光能量吸收系数与衬底表面质量的关联

高能激光系统中,单晶硅基底反射镜的能量吸收系数是影响系统性能的关键指标。衬底加工质量对镀膜后元件激光能量吸收系数影响显著。通过测试不同衬底粗糙度、划痕密度的单晶硅反射元件,分析衬底表面典型加工特征(粗糙度、划痕)对激光能量吸收系数的影响规律,认为粗糙度与吸收系数正相关,粗糙度均方根从0.668nm降低至0.345nm会使吸收系数降低28.0%。少量划痕对吸收系数的直接影响并不明显,吸收系数均值变化在3.1%以内。但表面划痕会诱发激光损伤,划痕密度较大时会引起后续能量吸收持续增大,辐照400s后,吸收系数较辐照100s时增大18.3%。