一类集值映射的连续性

基于对拟线性函数的深入研究，利用凸集分离定理和回收锥的性质，对由 Rn上拟线性函数构成的参数约束集，给出了在 Berge意义下当参数变化时，约束集产生的映射是下半连续的一个重要结论.利用该结论，可以很方便地得出拟线性规划稳定性的一系列结果.     

桓仁水库汛限水位动态控制决策支持表研制

针对水库汛限水位动态控制方案的具体化和可操作性问题,依据水库调洪计算原理和流域水量平衡原理,研制了桓仁水库汛限水位动态控制决策支持表.由此套表,即可根据实时和预报的水雨工情信息,确定面临时刻允许控制的库水位值及控泄流量等,方便水库调度技术人员和决策人快速查算、决策.该研究方法可供我国调节性能较高的大型水库(水电站)汛期洪水退水段库水位实时控制借鉴参考.     

无界域上非凸二次规划存在最优解的充分必要条件及判别方法

本文给出了无界域上不定二次规划存在最优解的充分必要条件及判别方法 ,而且还给出通过解一系列线性规划来判别是否存在最优解的方法     

基于AGPF的滚动轴承性能衰退趋势预测

针对粒子滤波算法中粒子退化和计算复杂度问题,提出了一种自适应遗传粒子滤波(AGPF)算法。该算法采用遗传算法代替传统粒子滤波中的重采样方法,并根据粒子数与滤波误差方差之间的关系,自适应调节滤波过程中的粒子数。通过预测滚动轴承的性能衰退趋势,对该方法进行验证,结果表明,AGPF算法能够在保证预测精度的条件下,减少滤波粒子数,更加适用于滚动轴承的性能衰退趋势预测。     

塑管混凝土界面透气性研究

提出了一种基于压力时间衰减法测定塑管混凝土界面透气性的方法,并研究不同界面改善措施对塑管混凝土界面透气性的影响.研究结果表明:透气性试验具有较高的重复性和稳定性;塑管混凝土界面的透气性随HEA膨胀剂掺量的提高而降低;Preprufe胶带能明显改善塑管-混凝土界面的粘结性能,使压力衰减时间或抗渗性能提高了一个数量级.最后,拟合压力-时间衰减曲线,并提出了经验函数式.     

On the Minimizing Trajectory of Convex Functions with Unbounded Level Sets

We consider a convex function f(x) with unbounded level sets. Many algorithms, if applied to this class of functions, do not guarantee convergence to the global infimum. Our approach to this problem leads to a derivation of the equation of a parametrized curve x(t), such that an infimum of f(x) along this curve is equal to the global infimum of the function on ⁿ .We also investigate properties of the vectors of recession, showing in particular how to determine a cone of recession of the convex function. This allows us to determine a vector of recession required to construct the minimizing trajectory.     

长脉冲激光辐照LY—12铝靶烧蚀表面的后退速度

用烧穿靶法测量自由振荡长脉冲 1.06μm会聚激光束烧蚀LY-12铝合金靶时间,用电子微量天平、金相显微仪、收集器等测量激光烧蚀铝靶材参量Am和h的技术,给出激光束烧蚀铝靶的烧蚀表面后退速度和烧蚀速度的结果。当烧蚀靶材的激光通量I=10~5～10~7W/cm~2时,烧蚀表面后退速度为0.5～3.8m/s,烧蚀速度为 1～8g/s。     

Convex functions with continuous epigraph or continuous level sets

Convex functions with continuous epigraph in the sense of Gale and Klée have been studied recently by Auslender and Coutat in a finite-dimensional setting. Here, we provide characterizations of such functionals in terms of the Legendre-Fenchel transformation in general locally convex spaces. Also, we show that the concept of continuous convex sets is of interest in these spaces. We end with a characterization of convex functions on Euclidean spaces with continuous level sets.     

Recession cones and asymptotically compact sets

The present note is concerned with the study of the relations between the notions of asymptotic cones introduced by Dedieu and that of recession cones introduced by Luc. Conditions under which these notions coincide are given, as well as the fact that the compactness condition used by Luc is related (more restrictively) to asymptotic compactness. As an application of these notions, a result on proper efficiency in the sense of Lampe, established by Luc in finite dimensions, is extended to the infinite-dimensional case.This work was partially done while the author was visiting the Department of Mathematics of the University of Pisa, Pisa, Italy.     

关于财政政策在经济过热和萧条时作用的简单分析

本文就财政政策在经济萧条和过热时所起的作用以及限制进行了讨论,特别是提出了造成经济危机的原因在很大程度上左右财政政策效果的观点。