模糊二人零和对策的纳什均衡求解

用三角模糊数刻画二人零和对策支付值的不确定性,提出了计算模糊二人零和对策纳什均衡解的多目标规划方法.给出了一种基于区间数比较的三角形模糊数排序方法,根据该方法将模糊二人零和对策转化为多目标线性规划.通过一个数值实例说明了该方法的有效性和实用性.     

圆环杆与平板连杆的适合光路集成的二维正方晶格光子晶体

提出了一种基于圆环杆与平板连杆的二维正方晶格光子晶体结构,讨论了绝对禁带的计算过程和各参数对绝对禁带宽度的影响.通过平面波展开法结合逐次逼近方法发现其最大绝对禁带相对值达到19.026％,比采用圆柱杆和平板连杆结构的二维正方晶格光子晶体以及采用圆环杆但无连杆的二维正方晶格光子晶体的最大绝对禁带相对值分别提高10.181％和712.035 9％;圆环杆的外径、圆环的相对厚度以及连杆的宽度都存在一个最佳值,且连杆宽度对绝对禁带相对值的影响比较敏感.     

Effect of the Pulse Duty Cycle on Characteristics of Plasma Electrolytic Oxidation Coatings Formed on AZ31 Magnesium Alloy

Ceramic coatings are synthesized on AZ31 magnesium alloy in alkaline silicate solution by the method of plasma electrolytic oxidation. The effect of two different duty cycles （10% and 50%） on the structure and corrosive properties of the coatings is investigated. It is found that the coatings are mainly composed of MgO, Mg2SiO4 and MgF2 through XRD analysis. SEM images indicate that coatings formed at 50% duty cycle have a relatively coarse surface with larger pore size and fewer pores, and have a slower growth rate than those formed at 10% duty cycle with the same treatment time. However, the results of potentiodynamic polarization tests demonstrate that coatings formed at 50% duty cycle exhibit better corrosion resistance as a result of more compact microstructure.     

Microstructure and Corrosion Performance of Oxide Coatings on Aluminium by Plasma Electrolytic Oxidation in Silicate and Phosphate Electrolytes

Ceramic coatings are fabricated on pure aluminium by plasma electrolytic oxidation （PEO） in three kinds of electrolyte systems [E1： 0.05M NaOH＋0.033M Na2SiO3, E2： 0.025M NaOH＋0.008M （NAPO3）6 and E3： 0.025M NaOH＋0.066M Na2SiO3＋0.008M （NAPO3）6]. The voltage-time responses show that the PEO process of E2 has the highest discharging voltage, which results in the biggest pores and heaviest cracks on the surfaces. X-ray diffraction results show that coatings produced in E1 and E3 are mainly composed of γ-Al2O3 and mullite, while coatings produced in E2 are mainly composed of a-Al2O3. After PEO treatment the corrosion resistance of aluminium is improved significantly and the coatings produced in E3 perform the best corrosion resistance.     

有限温度下二维Heisenberg铁磁系统的横向声频支声子激发

在二维正方Heisenberg铁磁系统的基础上建立了磁振子-声子相互作用模型.利用Matsubara格林函数理论研究了系统的横向声频支声子激发，计算了布里渊区的主要对称点线上的横向声频支声子色散曲线，发现在第一布里渊区的Σ线上，小波矢区(Γ附近k_xa＜0.2)横向声频支声子有硬化现象，但是在软化区(0.25＜k_xa＜0.7)有横向声频支声子有软化现象，在M附近(0.75＜k_xa)横向声频支声子有硬化现象.在Δ线上没有发生横向声频支声子有软化与硬化现象.在Z线上小波失区(X附近k_xa＜0.65)横向声频支声子有软化现象，但是在M附近横向声频支声子有硬化现象.并且又讨论了各项参数对横向声频支声子激发的影响，发现磁振子-声子耦合与自旋波劲度常数对横向声频支声子软化起很大的作用. 关键词： 磁振子-声子相互作用 横向声频支声子软化 Matsubara格林函数理论 铁磁系统     

汽相沉积法SnO_2薄膜光谱透过率气敏特性的研究

本文研究了用汽相沉积法制备ＳｎＯ２气敏薄膜和ＳｎＯ２膜的光谱透过率气敏特性。用汽相沉积制备ＳｎＯ２的方法是利用一个密封的石英管系统，把ＳｎＣｌ４溶液置于系统内，氧气通人系统，然后系统升温使ＳｎＣｌ４气化，通过控制氧气流量、沉积温度和沉积时间等，使气化后的Ｓｎ原子与氧原子在一定条件下生成ＳｎＯ２，沉积在玻璃衬底上。本文用ＡＳ－４３０Ｓ俄歇式电子能谱仪测试膜片的主要成分，并用光栅单色仪测试了膜片在乙醇还原性气体中的气敏特性。实验结果表明：与热喷法制备的ＳｎＯ２膜比较，沉积法具有工艺重复性好，可以控制沉积膜的厚度，灵敏度高等优点。因此，可制备出有选择性的“气敏－光透过率”型气敏传感器。     

离子注入对MoN_x薄膜超导转变温度的影响

本文研究了离子注入参数、离子注入方式对MoN_x薄膜T_c的影响。实验结果表明:通过提高离子注入剂量、能量使MoN_x薄膜的T_c值提高将受到限制。而改变离子注入方式对提高MoN_x薄膜的T_c值效果显著。     

Increasing the ·OH radical concentration synergistically with plasma electrolysis and ultrasound in aqueous DMSO solution

In recent years, significant increases in waste processing and material engineering have been seen by using advanced oxidation processes. The treatment results and energy yields of these processes are largely determined by the generation and retention of reactive oxygen species (ROS). However, increasing the amount of ROS remains a key challenge because of the unavailability of performance- and energy-efficient techniques. In this study, plasma electrolysis, ultrasound, and plasma electrolysis combined with ultrasound were used to treat dimethyl sulfoxide (DMSO) solutions, and the results showed that the two methods can synergistically convert filament discharge into spark discharge, and the conversion of the discharge mode can significantly increase the concentration of OH radicals and effectively improve the efficiency of DMSO degradation. We verified the rationality of the results by analyzing the mass transfer path of ROS based on the reaction coefficients and found that the ·OH radicals in aqueous solution were mainly derived from the decomposition of hydrogen peroxide. These findings indicated that the synergistic action of plasma electrolysis and ultrasound can enhance the production of chemically reactive species, and provide new insights and guiding principles for the future translation of this combined strategy into real-life applications. Our results demonstrated that the synergistic strategy of ultrasound and plasma electrolysis is feasible in the switching mode and increasing the ROS, and may open new routes for materials engineering and pollutant degradation.