SPEEK复合膜在电解制备过硫酸铵中的应用

为达到减少电解制备过硫酸铵的能耗及提高电流效率的目的,从改良电解槽隔膜的角度出发,分别对几种自制复合膜的电解性能进行了考察和比较,并对它们的机械强度和支撑层的耐腐蚀性进行了测试。通过试验发现：聚酯滤布的耐电解液腐蚀性最好;以100目聚酯滤布为支撑层制得的磺化聚醚醚酮（SPEEK）复合膜机械强度最高;以50目聚酯滤布为支撑层制得的SPEEK复合膜的电流效率最高且单位电耗最低。综合考虑,以50目聚酯滤布为支撑层制得的SPEEK复合膜比较适合应用于电解制备过硫酸铵中,尽管它的机械强度不是最大,但是与不添加支撑层的纯SPEEK膜相比其机械强度有了明显的提高,而且具有较高的电流效率和比较小的能耗。     

蛋白质折叠预测的禁忌搜索粒子群算法

针对PSO算法晚期收敛速度慢、求解精度差的缺点,提出了一种改进优化算法——将粒子群算法（Particle Swarm Optimization,PSO）与禁忌搜索算法（Tabu Search,TS）结合起来解决基于三维AB非晶格模型的蛋白质折叠预测问题。TS算法的引入提高了粒子群收敛后期的精度,粒子变异机制增强了粒子跳出局部极小值的能力。真实数据实验表明,该算法计算出的蛋白质序列能量值相比其他算法有更高的精确度,能够更好地模拟蛋白质构象,是分析蛋白质结构的一种有效方法。     

DMFCs用SPEEK/SiOx-S复合质子交换膜

A sulfonated poly(ether ether ketone) (SPEEK) membrane with a fairly high degree of sulfonation (DS) can swell excessively and even dissolve at high temperature. To solve these problems, insolvable functionalized silica powder with sulfonic acid groups (SiOx-S) was added into the SPEEK matrix (DS 55.1%) to prepare SPEEK/ SiOx-S composite membranes. The decrease in both the swelling degree and the methanol permeability of the membranes was a dose-dependent result of addition of the SiOx-S powder. Pure SPEEK membrane swelled 52.6% at 80°C, whereas the SPEEK/SiOx-S (15%, by mass) membrane swelled only 27.3% at the same temperature. From room temperature to 80℃, all SPEEK/SPEEK/SiOx-S composite membranes had methanol permeability of about one order of magnitude lower than that of Nafion115. Compared with pure SPEEK membranes, the addition of the SiOx-S powder not only leads to higher proton conductivity, but also increases the dimensional stability at higher temperatures, and greater proton conductivity can be achieved at higher temperature. The SPEEK/SiOx-S (20%, by mass) membrane could withstand temperature up to 145°C, at which in 100% relative humidity (RH) its proton conductivity exceeded slightly that of Nafion115 membrane and reached 0.17 S•cm－1, while pure SPEEK mem-brane dissolved at 90°C. The SPEEK/SiOx-S composite membranes are promising for use in direct methanol fuel cells because of their good dimensional stability, high proton conductivity, and low methanol permeability.     

DMFCs用磺化聚醚醚酮/磺化酚酞型聚醚砜共混质子交换膜

A sulfonated poly(ether ether ketone) (SPEEK) membrane with fairly high degree of sulfonation (DS) swells excessively and even dissolves at high temperature. To solve these problems, sulfonated phenolphthalein poly(ether sulfone) (SPES-C, DS 53.7%) is blended with the SPEEK matrix (DS 55.1%, 61.7%) to prepare SPEEK/SPES-C blend membrane. The decrease in swelling degree and methanol permeability of the membrane is dose-dependent. Pure SPEEK (DS 61.7%) membrane dissolves completely in water at 70ºC, whereas the swelling degree of the SPEEK (DS 61.7%)/SPES-C (40%, by mass) membrane is 29.7% at 80ºC. From room temperature to 80ºC, the methanol permeability of all SPEEK (DS 55.1%)/SPES-C blend membranes is about one order of magnitude lower than that of Nafion®115. At higher temperature, the addition of SPES-C polymer increases the dimensional stability and greater proton conductivity can be achieved. The SPEEK (DS 55.1%)/SPES-C (40%, by mass) membrane can withstand temperatures up to 150ºC. The proton conductivity of SPEEK (DS 55.1%)/SPES-C (30%, by mass) membrane approaches 0.16 S•cm－1, matching that of Nafion115 at 140ºC and 100% RH, while pure SPEEK (DS 55.1%) membrane dissolves at 90ºC. The SPEEK/SPES-C blend membranes are promising for use in direct methanol fuel cells because of their good dimensional stability, high proton conductivity, and low methanol permeability.     

水源热泵性能测试实验平台开发

水源热泵性能测试实验平台是一种测量水源热泵机组工作效率及运行状态的实验设备,主要应用在实验室专业教学。该实验平台可以帮助学生们理解水源热泵系统的工作原理,了解制冷循环系统的组成等。     

催化层厚度对质子交换膜燃料电池性能影响的数值研究

采用一维稳态宏观均相模型,首次对不同阴极催化层（CCL）厚度的质子交换膜燃料电池（PEMFC）在全操作电流范围内的功率输出进行了计算和比较。在催化层中各相的体积比不变的前提下,催化层厚度以2种方式变化：一是变化单位面积催化层内的Pt载量;二是变化Pt在碳载铂（Pt/C）催化剂颗粒中的质量分数。2种方式的模拟结果均表明,催化层较厚的PEMFC具有较高的功率输出。但是从提高催化剂利用率角度考虑,第1种催化层厚度变化方式中催化层越薄催化剂利用率越高,第2种方式相反。在本研究设定的CCL参数范围内,最适宜厚度催化层在整个电流密度范围内都使PEMFC有最高的功率输出。     

非接触式浮体六自由度监测系统研究

提出了一种非接触式浮体六自由度运动测量与分析系统。该系统由视频采集模块、三维计算模块、用户交互模块3 部分构成。视频采集模块用来获取不同视角的图像信息;三维计算模块融合了改进的摄像机自标定技术、立体视觉特征点检测技术、六分量解算方法等,目的是求得物体6 个自由度的运动情况;用户交互模块提供了定点可视的物体姿态及角度变化信息,方便用户进行分析计算。实测证明,该测量系统设备简单,重构速度快,能适应复杂的海上环境并能够实现远距离监测,满足浮体测量使用要求。     

QPSO算法在生产调度中的研究与应用

在对某印染企业的生产状况进行深入调研和分析的基础上,对微粒群算法及量子粒子群算法进行了对比研究,并根据实际情况对算法进行了部分改进,使之能适用于离散的生产调度问题。最后将量子粒子群算法应用到花布印染企业的生产调度中,对加工任务进行优化调度,并实现甘特图的动态生成。该结果可直接应用于企业车间调度中,具有一定的实际应用价值。     

间歇蒸馏的优化操作

本文研究了间歇蒸馏操作的最佳经济收益问题.在二元物系的系统模型中考虑了塔板的持液及冷凝器的持液,并考虑了塔板效率.用多项式拟合相平衡关系.选择回流比作为控制函数,应用最优控制理论导出计算步骤,用数值方法叠代出使经济收益函数最大的回流比函数.将解出的最优操作方案与两种传统的操作方案进行了比较.为检验最优操作方案的可实施性,在一筛板塔上进行了实验,证明优于传统操作.     

通识教育课程中的思政教育探索与实践——以C语言程序设计课程为例

针对如何将思政教育与程序语言课程有机融合的关键性问题,提出案例驱动的“程序语言+思政教育”相结合的教学新模式和新方法,以C语言程序设计课程为例,介绍课程思政教学路径及体系设计,最后说明课程思政教学效果。