PA-DDS算法在水库多目标优化调度中的应用

Pareto存档动态维度搜索（Pareto-Archived Dynamically Dimensioned Search,PA-DDS）算法是一种求解多目标问题的随机搜索启发式算法。本文将PA-DDS算法引入考虑供水和发电的多目标优化模型优化水库调度图,与非支配排序遗传算法（NSGA-II）和多目标粒子群算法（MOPSO）对比了收敛性,并在求得非劣解分布的均匀性和与理论Pareto前端的相似性方面与NSGA-II进行比较,分析该算法求解水库多目标调度问题的优化性能,对比分析不同目标下的优化调度图。结果表明：PA-DDS算法能够得到更高质量的非劣解集,优化调度图与原设计调度图相比,能更有效协调供水和发电的矛盾,在小幅降低（0.96%）发电量的前提下显著提高（8.07%）水库供水量,平均每年增加经济效益0.55亿元。     

硫脲基松香咪唑啉季铵盐 对A3碳钢的缓蚀性能研究

合成了硫脲基松香咪唑啉季铵盐,对其结构进行了红外和核磁表征。采用失重法、动电位极化曲线、交流阻抗以及接触角测试分析了目标产物在质量分数为15%HCl溶液中对A3碳钢的缓蚀性能。采用AFM以及XPS测试对产物的吸附膜进行了表征。结果表明：目标产物的缓蚀效率随添加质量分数的增加先增大后减小,当目标产物质量分数增加到占盐酸质量的0.4%时,缓蚀效率最高达到90.78%;此物质是一种阴极控制为主的混合型缓蚀剂;AFM以及XPS结果证实目标产物确实可以在碳钢表面形成缓蚀剂吸附膜。     

基于遗传模拟的水库发电优化调度模型及应用

为快速高效绘制适宜性强、效益高、便于操作的水库发电调度图,以常规发电调度图运行方式（时历法）作为模拟规则,以保证出力保证率满足前提下发电量最大为目标函数,借助实码加速遗传算法的并行计算能力,把调度图绘制（模拟规则）与有效性检验（智能优化）结合起来,建立水库发电优化调度模型。作为实例,应用该模型于中国某大型年调节水电站优化调度图绘制中。结果表明：该模型是有效的,可以考虑下游生态需水等水电站优化调度若干复杂约束条件与水库管理者的经验（常规调度绘制方法不能）,调度图更符合实际;把调度图的绘制与有效性检验结合起来,得出的调度图无需再检验,较常规方法更为快速高效;利用了遗传算法的并行计算能力,可快速获得满足保证出力要求的多组优化调度方案（调度图）,决策信息更加丰富。     

水平与竖向加速度-时程曲线叠加效应下边坡永久位移计算的极限上限分析

实际边坡动力稳定性受地震竖向与水平方向效应共同作用,传统边坡地震永久位移计算方法较少考虑竖向地震波影响,采用实际地震的竖向与水平方向加速度-时程曲线共同效应更符合工程实际。基于极限分析上限法和Newmark刚塑性滑块模型,提出一种基于实际水平向与竖向地震加速度-时程曲线的边坡永久位移计算改进方法,以3个工程边坡为例,探讨了两组具有代表性实测典型水平和竖向地震地面运动记录对边坡地震永久位移计算的影响。研究结果表明:不考虑竖向地震加速度时程曲线时,本文方法可蜕化为与前人方法兼容;不同地震波的竖向与水平地震动时程曲线的叠加效应不同,竖向地震对边坡永久位移的影响不可忽略。     

基于LabVIEW的应力-能量法应用软件设计

本文在试验的基础上,基于LabVIEW的数据分析软件设计,通过对实验得到的动应力动能量值进行插值、拟合求出动应力动能量曲线,进而得到a、b值;再将a、b带入应力-能量曲线来反求最大加速度-静应力曲线。这一软件设计既是对应力-能量法可行性的验证,又是对应力能量法的实际应用.其目的在于寻求一种更为实用简便的方法以减少缓冲曲线测定的工作量,从而大大缩短包装设计的时间,减少包装材料的用量.     

Vibrational dynamics and heat capacity of poly(glycolic acid)

Polyglycolic acid (PGA) (-CH₂-COO-)_n is the first bioresorbable synthetic polymer which is used to make biomedical and pharmaceutical devices. It has a planar zigzag conformation. A comprehensive study of the normal modes and their dispersion in PGA using Urey Bradley force field is being reported. Characteristic features of the dispersion curves have been reported. The heat capacity derived from the dispersion curves via the density-of-states, is in good agreement with the experimental data of Lebedev and Yevstropov.     

High Rate Anodic Dissolution of 100Cr6 Steel in Aqueous NaNO 3 Solution

The high rate anodic dissolution of 100Cr6 steel in NaNO₃ electrolytes of various concentrations and at different temperatures was investigated. Galvanostatic flow channel experiments were used to examine the current efficiency of the steel substrate. Below 6 A cm^–2(zone A), oxygen evolution dominates, while at higher current densities iron dissolution prevails (zone C). Potentiodynamic polarization studies indicated a complete substrate surface passivation up to +1.8V (vs NHE), and periodic fluctuations of the current density at higher anode potentials (> +1.8 V) due to severe oxygen evolution. Rotating cylinder measurements served for polarization studies at lower current densities in the region of dominating oxygen evolution. Scanning electron micrographs revealed a correlation between the current efficiency and the coverage of the substrate surface with an electronically conductive film at current densities of 2, 9 and 20 A cm^–2. The microstructure of the black, solid surface film developing during the high rate anodic dissolution of the steel was found to be heterogeneous and very porous. The main film components, as determined by X-ray diffraction and Auger electron spectroscopical measurements, were amorphous iron oxides, Fe _x O _y , and inert carbides, M₃C, originating from the steel matrix. An activation–repassivation process is proposed, which is responsible for the development of the complex multilayer (multiphase) structure observed at the steel substrate surface.     

一类Bézier型三角多项式曲线的构造

曲线的设计与修改是CAD/CAM和数控技术研究的一个重要课题,具有广泛的应用背景。为了满足表示和设计复杂自由曲线的需求,该文构造了一类扩展的Bézier型三角多项式曲线-TP-Bézier曲线,给出了TP-Bézier基函数及TP-Bézier曲线的定义与性质。通过研究发现,所构造的曲线具有Bézier曲线类似的一系列优良性质。     

氢同位素低温吸附分离的平衡吸附模型

1 INTRODUCTION Hydrogen isotope separation has been the com- mon concern for many years, for pure deuterium can be used as a fuel of the nuclear fusion reactor or as a tracer in medical cure, chemical reaction and geo- graphic research. Several methods such as chemical exchange, cryogenic distillation, laser, and thermal diffusion are applied for separating the hydrogen iso- topes, but these methods require great invest and en- ergy consumption. Therefore, other alternative meth- ods need …     

遗传算法中参数变化对曲线拟合结果的影响

为得出遗传算法各参数变化对曲线拟合的影响,给出遗传算法在不同初始种群、交叉概率和变异概率的拟合实验,并对结果进行比较和分析。实验证明,当变异概率同为0．05时,种群数目变大,交叉选择变小,拟合效果较好。在用遗传算法拟合曲线时,衡量参数设置恰当与否,要依据多次运行的收敛情况和解的质量来判断。