双隐身飞机闪烁干扰对单脉冲雷达性能的影响

针对单脉冲雷达检测跟踪协同干扰状态的双隐身飞机编队时,角度跟踪误差性能难以合理评价的问题,首次建立了基于侧双机编队平飞航迹的隐身飞机协同闪烁非相参干扰模型,经过相同航迹下编队姿态的解算,获取闪烁干扰模型下的编队动态雷达散射截面序列,结合双机闪烁干扰模型下单脉冲雷达角度跟踪特点,推导得出与双机编队闪烁干扰相适应的单脉冲雷达角度误差跟踪模型,以最小干扰有效诱偏角为实时参变量对闪烁干扰模式下雷达角度跟踪误差性能变化的程度作出了评价。仿真表明双隐身飞机闪烁非相参干扰在干扰释放阶段能有效使单脉冲雷达角误差提高5.67倍,有效诱偏单脉冲雷达的角度跟踪。     

Microstructure and improved mechanical properties of ultrafine-grained Mo-12Si-8.5B (at.%) alloys with addition of ZrB2

Multi-hierarchical Mo-12Si-8.5B-x Zr B_2(x=0,0.5,1.0,1.5,2.5 wt%)alloys consisting of three ultrafine-grained(UFG,0.47–0.81μm)phases of Mo_5Si B_2(T2),Mo_3Si and Mo solid solution(α-Mo)were prepared by mechanical alloying following hot pressing.Microstructure observations showed that the intermetallic phases(Mo_3Si and T2)distributed dispersedly in the continuousα-Mo matrix associated with the homogeneously embedded nanoscaled particles(10–225 nm)in the grain interiors and at the grain boundaries.The Mo-12Si-8.5B-x Zr B_2alloys exhibited monotonically increasing compressive strength to 3.13 GPa with increasing content of Zr B_2,and the fracture toughness increased about 27%and reached at 11.5 MPa m~(1/2)at 1.0 wt%Zr B_2,rendering the Mo-12Si-8.5B-1.0 wt%Zr B_2alloy possessing the best combined mechanical properties of high strength and high toughness.The underlying reason for the superior mechanical properties of the Mo-12Si-8.5B-x Zr B_2alloys is that the dispersedly distributed nanosized particles in the UFG multi-phased-matrix can not only effectively block the dislocation motion to increase the strength but also store the dislocations to increase the strain hardening ability during mechanical deformation.     

A Holistic Energy-Efficient Approach for a Processor-Memory System

Component overclocking is an effective approach to speed up the components of a system to realize a higher program performance; it includes processor overclocking or memory overclocking. However, overclocking will unavoidably result in increase in power consumption. Our goal is to optimally improve the performance of scientific computing applications without increasing the total power consumption for a processor-memory system. We built a processor-memory energy efficiency model for multicore-based systems, which coordinates the performance and power of processor and memory. Our model exploits performance boost opportunities for a processor-memory system by adopting processor overclocking, processor Dynamic Voltage and Frequency Scaling(DVFS), memory active ratio adjustment, and memory overclocking, according to different scientific applications.This model also provides a total power control method by considering the same four factors mentioned above. We propose a processor and memory Coordination-based holistic Energy-Efficient(CEE) algorithm, which achieves performance improvement without increasing the total power consumption. The experimental results show that an average of 9.3% performance improvement was obtained for all 14 benchmarks. Meanwhile the total power consumption does not increase. The maximal performance improvement was up to 13.1% from dedup benchmark.Our experiments validate the effectiveness of our holistic energy-efficient model and technology.     

钻杆接头激光淬火硬度及金相分析

利用大功率ＣＯ２激光对钻杆接头表面进行处理．通过显微硬度计测定了硬化层硬度的分布规律，并对硬化层进行了金相分析．结果表明激光处理后钻杆接头表面为理想的针状马氏体，表面硬度有很大提高．     

氟电极多标准添加法测定新疆维吾尔草药中微量氟的方法

本文介绍了用氟离了选择电极标准稀释法测定维吾尔药中的氟离子。其方法简便、灵敏、准确。文中应用了格氏作图法计算在试样中的氟。所得结果令人满意。     

香葱油香精-β-环糊精包合物的制备工艺条件研究

应用三因素六水平的均匀设计方法,研究β-环糊精对香葱油香精的包合作用,利用研磨法,筛选出香葱油香精—β-环糊精包合物的较佳制备条件.即温度40℃;研磨时间2.5h;挥发油与β-环糊精质量比为1∶14.在此条件下,包合物收率和挥发油包合率都比较高,分别为98.32%和82.21%.     

对称边置集中荷载钢筋混凝土无箍板抗剪强度试验研究

本文根据所做的钢筋混凝土无箍板在对称边置集中荷载作用下49块板的试验结果,通过对其破坏形态、破坏机理以及受力状态的分析,找出了影响抗剪强度的主要因素,提出了抗剪强度极限状态表达式,该推荐公式与试验结果有较好的拟合优度,并有较好地应用价值和经济效果.