微波合成阿司匹林的研究

以硫酸镍为催化剂,水杨酸和醋酐为原料用微波法合成阿司匹林。考察了催化剂用量、原料配比、辐射功率、辐射时间等因素对收率的影响。合成工艺条件为：n（水杨酸）：n（醋酐）：n（硫酸镍）=1：2：0．1,微波辐射时间为50S,辐射功率为480W,收率达87．7％。该合成工艺简单,产品质量好且污染少。     

多工况下风电齿轮箱联接螺栓疲劳寿命分析

针对风电齿轮箱联接螺栓疲劳受载复杂性问题,建立含螺栓的风电齿轮箱有限元模型,分析不同扭转和弯曲载荷下螺栓应力变化规律,依据风力发电机实际载荷谱,分段插值获得螺栓疲劳应力谱;基于雨流计数方法和Palmgrem-Miner疲劳累积损伤理论,结合螺栓材料S-N曲线,预测各疲劳应力谱下螺栓疲劳损伤,研究风电齿轮箱三种疲劳工况下各不同联接螺栓的疲劳寿命。结果表明:各疲劳工况下,前箱体与一级内齿圈间联接螺栓疲劳损伤值较大,疲劳弯矩工况下达最大损伤值0.853;疲劳扭矩工况下螺栓应力随扭矩增大而增大,危险螺栓靠近箱体两侧支撑处;疲劳弯矩工况下箱体产生倾覆效应,M_Y弯矩下危险螺栓位于箱体上下两侧,M_Z弯矩下危险螺栓位于箱体左右两侧。此次研究工作对提高风电齿轮箱整体使用寿命具有重要意义。     

Electrochemical behavior of CoCl2 in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate

The electrochemical behavior of CoCl2 in 1-butyl-3-methylimidazolium hexafluorophosphate （[bmim]PF6） was investigated by cyclic voltammetry. The cyclic voltammograms were obtained from electrochemical measurement under different temperatures, and the reversible behavior for Co^2＋/Co^3＋ redox couple on glassy carbon electrode in [bmim]PF6 was confirmed by the characteristic of the peak currents. The diffusion coefficients （about 10^-11m^2/s） of Co^2＋ in [bmim]PF6 under different temperatures were evaluated from the dependence of the peak current density on the potential scan rates in cyclic voltammograms. It is found that the diffusion coefficient increases with increasing temperature. Diffusion activation energy of Co^2＋ in [bmim]PF6 is also calculated to be 23.4 kJ/mol according to the relationship between diffusion coefficient and temperature.     

三峡升船机船厢驱动系统齿轮齿条传动强度分析

以三峡升船机船厢驱动系统齿轮齿条传动为研究对象,基于共轭啮合理论推导修形齿轮齿廓方程,建立齿轮齿条传动三维接触有限元分析模型,通过罚函数法建立动力接触系统有限元方程,仿真计算齿轮齿条传动的综合位移、等效应力及齿面接触应力。建立含齿廓修形和轴线偏差的齿轮齿条接触有限元模型,分析了轮齿修形与轴线偏差对齿轮齿条传动啮合性能的影响,为三峡升船机的可靠运行提供依据。     

表面活性剂对铝合金表面电化学沉积硅烷膜层的影响

采用交流阻抗技术研究了表面活性剂对不同条件下双-1,2-[3(三乙氧基)硅丙基]四硫化物硅烷在铝合金表面阴极电化学辅助沉积成膜的影响.研究表明:在硅烷溶液中加入表面活性剂进行改性,可降低硅烷在铝合金表面电化学沉积的阴极沉积电位,抑制硅烷沉积过程中的析H2作用,改善电极界面区域硅烷成膜环境.试验证明:硅烷溶液中表面活性剂的最佳改性浓度为0.03%,在此浓度下,铝合金表面硅烷阴极电沉积的最佳沉积电位为-1.6V.     

Electrochemical behavior of CoCl2 in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate

The electrochemical behavior of CoCl2 in 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF6) was investigated by cyclic voltammetry. The cyclic voltammograms were obtained from electrochemical measurement under different temperatures, and the reversible behavior for Co2 /Co3 redox couple on glassy carbon electrode in [bmim]PF6 was confirmed by the characteristic of the peak currents. The diffusion coefficients (about 10-11m2/s) of Co2 in [bmim]PF6 under different temperatures were evaluated from the dependence of the peak current density on the potential scan rates in cyclic voltammograms. It is found that the diffusion coefficient increases with increasing temperature. Diffusion activation energy of Co2 in [bmim]PF6 is also calculated to be 23.4kJ/mol according to the relationship between diffusion coefficient and temperature.     

基于模糊决策PSO算法的互联系统过电流保护配合多目标优化

电力系统面向大范围互联、多电源接入发展直接导致了继电保护整定模式发生改变,给过电流保护定值优化带来了新的挑战。提出了针对多源电网和互联电网的过电流保护整定校核方案。首先分析了传统过电流保护的模型和原理,然后针对时间定值倍数连续和离散变量的问题,提出了基于多目标粒子群算法和模糊决策的多目标优化模型,优化互联系统的主保护和后备保护的动作时间间隔,同时考虑了不同电流时间特性曲线对于优化结果的影响。利用IEEE 8节点系统对所提模型进行了算例分析,验证了所提方法的正确性。     

冷轧窄带钢生产的技术改造

简要介绍了新钢冷轧窄带钢生产线改造前的情况和改造后新增主要设备的性能。改造后品种增加、规格扩大，质量提高，成本下降，经济效益明显．     

低阴极沉积电位对铝合金表面硅烷膜层的影响

在低阴极沉积电位条件下,使用表面活性剂改性硅烷溶液,实现了双-1,2-[γ(三乙氧基)硅丙基]四硫化物(BTSPS)在铝合金电极表面的电化学沉积,新的临界沉积电位(NCCP)约为-1.6 V.研究表明,在低阴极沉积电位下铝合金表面能得到更厚、更致密的硅烷膜层,并且在改性后溶液中制备的膜层具有较高的极化阻力.表面活性剂的加入可以降低沉积时析氢的影响,提高硅烷沉积性能.临界沉积电位的降低,使得硅烷覆盖的铝合金电极比临界沉积电位(-0.8 V)下的电极具有更好的抗腐蚀性能.