水库水量水质优化调度综述

从水量、水质两方面详细叙述了水库水量水质优化调度国内、外的发展概况;在此基础上,提出了目前存在的问题;针对这些问题,阐述了解决问题的途径和方法,和读者共同探讨。     

具有准备时间的模糊交货期的排序问题

本文分析了一类具有准备时间的模糊交货期的单机排序问题.将任务具有不同准备时间,任务加工允许中断,目标函数是最大延误的排序问题由经典交货期推广到模糊交货期,并给出了最大模糊延误修正值的定义,给出了一些性质。在此基础上给出了此类问题的算法。为了便于计算,用三角形模糊数表示模糊交货期,本文用模糊交货期的隶属函数来比较任务的完工时间和交货期,判断任务是否误工。     

金属基复合材料弹塑性拉伸变形特征的细观力学研究(英)

基于作者发展的广义自洽有限元迭代平均化方法,利用增强相的平均应力集中因子对外荷载的敏感性,将光滑的金属基复合材料的弹塑性应力－应变曲线划分为多个特征变形区域,为完整地定义金属基复合材料的弹塑性变形提供了有效的手段．     

冷双曲面齿轮和螺旋锥齿轮设计的统一算法

目的 为使准双曲面齿轮和螺旋锥齿轮几何计算方法达到统一。方法分析了这两种锥齿轮几何方法的特点,并定义两个偏置角系数。同时,进行了两种锥齿轮的算例分析。结果 给出了适合于两种锥齿轮几何计算的统一基本公式和迭代方法。结论 这种统一的方法对锥齿轮的标准化、系列化和ＣＡＤ技术的应用具有一定意义。     

High-pressure sound velocity of perovskite-enstatite and the possible composition of the Earth’s lower mantle

The compressional sound velocity V_p for enstatite of polycrystalline specimens were measured at pressures from 40 to 140 GPa using the optical analytical techniques under shock loading. The dependence of V_P, (in km/s) on Hugoniot pressure (P, in GPa) can be described by InV_p= 3.079-0.691 In(P) + 0.094(lnP)². V_p satisfies Birch’s law:V _p = 4.068 + 1.677_ρ, where ρ is corresponding density, which indicated that enstatite is stable throughout the conditions of the lower mantle. The wave velocityP is 0.5% lower and the wave velocity S is 2% higher than that of PREM respectively. We concluded that the lower mantle is mainly composed of perovskite-(Mg_1-x, Fe_x) SiO₃ and only a small amount of (Mg_1-x, Fe_x) O is allowed in it.     

SEA方法及其在C~3I系统效能分析中的应用(Ⅳ)——系统效能分析

ＳＥＡ方法的一个重要特征是可全面、灵活地进行系统效能分析．本文在前述文章中建立的Ｃ３Ｉ系统效能模型基础上,进一步阐述了Ｃ３Ｉ系统（结构、参数等）、环境、使命等因素影响系统效能的途径及其分析方法,并附有实例．文章最后指出了ＳＥＡ方法中仍需要解决的问题．     

Transferability of tag SNPs in genetic association studies in multiple populations

A general question for linkage disequilibrium-based association studies is how power to detect an association is compromised when tag SNPs are chosen from data in one population sample and then deployed in another sample. Specifically, it is important to know how well tags picked from the HapMap DNA samples capture the variation in other samples. To address this, we collected dense data uniformly across the four HapMap population samples and eleven other population samples. We picked tag SNPs using genotype data we collected in the HapMap samples and then evaluated the effective coverage of these tags in comparison to the entire set of common variants observed in the other samples. We simulated case-control association studies in the non-HapMap samples under a disease model of modest risk, and we observed little loss in power. These results demonstrate that the HapMap DNA samples can be used to select tags for genome-wide association studies in many samples around the world.     

现代社会调查方法在黄土高原水土保持世行贷款二期项目社会效益监测中的应用

黄土高原水土保持世行贷款项目自实施以来,给项目区带来了明显的效益。在项目效益的监测评估中,社会效益的监测评价手段和方法显得有些不能满足实际需要。本文试图从社会调查的角度规范项目社会效益监测评价的过程和方法,使项目社会效益的监测评价更具有可操作性,监测评价的结果更加符合客观实际。     

Research on fault-tolerant control of networked control systems based on information scheduling

A kind of networked control system is studied; the networked control system with noise disturbance is modeled based on information scheduling and control co-design. Augmented state matrix analysis method is introduced, and robust fault-tolerant control problem of networked control systems with noise disturbance under actuator failures is studied. The parametric expression of the controller under actuator failures is given. Furthermore, the result is analyzed by simulation tests, which not only satisfies the networked control systems stability, but also decreases the data information number in network channel and makes full use of the network resources.     

解Job-Scheduling调度问题的一种遗传算法

带有截止期的作业调度问题是企业管理、操作系统中重要而又基本的问题之一。利用遗传算法解决了操作系统中单机、无资源约束 ,且每个作业可在等量时间内完成的作业调度问题。在系统地讨论了带有截止期的作业调度有关理论的基础上 ,设计并实现了该问题的一种新型算法———基因型算法。最后给出了算法的一些运行结果。实验仿真结果表明 ,该算法具有很强的鲁棒性。