Scheduling with centralized and decentralized batching policies in concurrent open shops

This article considers batch scheduling with centralized and decentralized decisions. The context of our study is concurrent open shop scheduling where the jobs are to be processed on a set of independent dedicated machines, which process designated operations of the jobs in batches. The batching policy across the machines can be centralized or decentralized. We study such scheduling problems with the objectives of minimizing the maximum lateness, weighted number of tardy jobs, and total weighted completion time, when the job sequence is determined in advance. We present polynomial time dynamic programming algorithms for some cases of these problems and pseudo‐polynomial time algorithms for some problems that are NP‐hard in the ordinary sense. © 2010 Wiley Periodicals, Inc. Naval Research Logistics 58: 17–27, 2011     

美军作战实验室建设研究

简要回顾了美军作战实验发展的历史,从军种到联合详细阐述了美军作战实验室完整的体系,并简要介绍了各作战实验室所完成的典型实验,研究了美军作战实验室主要的实验方法和技术手段,剖析了美军作战实验室的运行机制,探讨了美军作战实验室建设带给我们的启示。     

多铁性磁电智能复合材料的力学研究进展

介绍了多铁性磁电智能复合材料的概念、分类及发展现状;总结了两类典型多铁性复合材料的力学问题（包括波动与振动问题、夹杂问题、断裂问题等）的研究进展;分析了层状多铁性复合材料力学行为的特殊性;基于应变介导的磁电耦合机制,阐述了界面断裂力学研究对于层状多铁性复合材料研制的重要性和必要性;最后指出了该领域下一步的研究方向。     

弹性基上圆柱管弯曲行为的高阶剪切梁理论解

以弹性基上圆柱管为研究对象,基于高阶剪切变形梁理论推导了Winkler弹性基圆柱管弯曲变形的高阶剪切梁理论控制方程,给出四种典型工况弯曲问题的精确解.研究表明,无须假设剪切修正系数,只需引入适当横截面翘曲形状函数,高阶梁理论在圆柱管内外表面满足剪应力τxr为零的边界条件,且对于不同长径比和厚径比的圆柱管弯曲问题均能提供...     

Study of high-speed-impact-induced conoidal fracture of Ti alloy layer in composite armor plate composed of Ti-and Al-alloy layers

In order to understand the mechanism of conoidal fracture damage caused by a high-speed fragment-simulating projectile in titanium alloy layer of a composite armor plate composed of titanium- and aluminum-alloy layers, the ballistic interaction process was successfully simulated based on the Tuler-Butcher and GISSMO coupling failure model. The simulated conoidal fracture morphology was in good agreement with the three-dimensional industrial-computed-tomography image. Further, three main damage zones (zones I, II, and III) were identified besides the crater area, which are located respectively near the crater area, at the back of the target plate, and directly below the crater area. Under the high-speed-impact conditions, in zone II, cracks began to form at the end of the period of crack formation in zone I, but crack formation in zone III started before the end of crack formation in zone II. Further, the damage mechanism differed for different stress states. The microcracks in zone I were formed both by void connection and shear deformation. In the formation of zone I, the stress triaxiality ranged from-2.0 to-1.0, and the shear failure mechanism played a dominant role. The microcracks in zone II showed the combined features of shear deformation and void connection, and during the for-mation process, the stress triaxiality was between 0 and 0.5 with a mixed failure mode. Further, the microcracks in zone III showed obvious characteristics of void connection caused by local melting. During the zone III formation, the triaxiality was 1.0-1.9, and the ductile fracture mechanism was dominant, which also reflects the phenomenon of spallation.     

装备表面现代维修保养技术研究

结合装备表面智能维修保养技术方面的研究成果,介绍了装甲装备故障智能检测技术、自适应、自修复功能材料,装甲装备器材全自动保养设备等先进技术,侧重装备维修保养阐述了如何提高信息化程度,推进军队武器装备维修保养技术的现代化建设。     

体内芳纶纤维筋梁受弯性能试验研究分析

通过钢筋混凝土梁与芳纶纤维筋梁的弯曲试验现象和结果,探讨了芳纶纤维筋梁的正截面受力性能和破坏模式,分析了芳纶纤维筋配筋率对混凝土梁的裂缝宽度、挠度和承载力等的影响,为今后进一步研究和设计AFRP筋受弯构件提供了参考。     

某压力容器壳体水压爆裂原因分析

针对某压力容器壳体生产过程中出现的水压试验异常爆裂问题,通过材料成分、热处理组织、力学性能、宏观和微观断口分析,确定了裂源位置、裂纹缺陷性质、产生原因及断裂机理;通过断裂力学分析,确定了水压爆裂的原因。提出了淬火工艺改进建议和防范措施。     

开放式自动测试系统软件设计

实现测试程序的可移植性、改善测试系统仪器互换性和提高ATS新技术注入能力是通用ATS研制的热点问题,遵循标准和实现开放式系统是解决问题的途径,软件系统是当前通用ATS实现开放性的制约因素.根据领域需求软件采用层体系结构模式,合理划分各层功能,在高层提供面向信号的编程接口,资源控制层提供了面向功能的接口,资源管理实现了系统对资源控制层构件开放的动态集成方式,实现了开放式的系统软件构架.     

战时装备调配保障决策模型构建研究

分析了战时装备调配保障决策的特点,运用模糊聚类分析法对装备调配保障对象进行了分组和优先级排序,以此为基础,运用目标规划法构建了战时装备调配保障决策模型,最后,通过实例验证了模型的可行性和有效性．