Polyoligomeric silsesquioxane (POSS)–hydrogenated polybutadiene polyurethane coatings for corrosion inhibition of AA2024

A series of coatings were developed that help prevent corrosion of aluminum alloy 2024 (AA2024). The coatings were based on an aliphatic polyurethane–polyoligomeric silsesquioxane (PU–POSS) resin. The materials were selected to exhibit a high level of hydrophobicity, which is expected to increase the moisture barrier properties, and thereby improve corrosion prevention. In addition, corrosion inhibitors (free molecules or encapsulated) were introduced into the coatings to improve corrosion resistance. The performance of the coatings was quantified using electrochemical impedance spectroscopy (EIS) and salt fog testing. Results from various formulations show that the hardness of the coating can be controlled by adjusting the ratio of POSS to hydrogenated hydroxyl terminated polybutadiene in the formulation. The coatings also had remarkable barrier properties, fast curing, and very high adhesion to the treated AA2024 substrate, all of which are expected to improve the anti-corrosion properties of the coatings. The best corrosion protection of AA2024 was observed in a transparent 10 μm thick PU–POSS bilayer coating that contained a mixture of sodium-2-mercaptobenzothiazole (i.e., NACAP) and benzotriazole-laden hydrotalcite. It was found that only certain corrosion inhibitors (free molecules or encapsulated) improve the anti-corrosion properties of the coating, whereas other corrosion inhibitors may actually degrade the coating performance.     

柜式空气净化器硬件电路设计

描述的柜式空气净化器应满足人们日常生活中对空气质量的要求;要使柜式空气净化器能够检测空气的质量并且净化空气,从而达到提升空气质量的目的.将整个系统的电路设计分解成若干更加细致的功能模块.描述了柜式空气净化器采用的VFD显示器的静态和动态控制原理,最终采用动态控制原理控制VFD显示器;另外描述了柜式空气净化器检测传感器的电路设计、实验以及最终的效果测试.制作成功之后的电路能够通过实际检测,完成设计任务,能够完全控制柜式空气净化器.     

新型改性脂肪胺固化剂的合成及其在定向钻穿管道外防腐涂层中的耐腐蚀性能研究

合成了一种新型的改性脂肪胺固化剂,并以此制备了定向钻穿管道用无溶剂防腐涂料。该固化剂赋予涂层优良的耐腐蚀性,可满足定向钻穿管道外防腐层的性能要求。采用电化学交流阻抗对该涂层的耐腐蚀性进行了评价,并测试了其耐盐雾性。     

基于深度融合网络的煤矿图像尘雾清晰化算法

针对现有煤矿尘雾图像清晰化算法存在的过增强现象和适用性不足等问题,提出一种基于深度融合网络的清晰化复原算法。深度融合网络主要包括3个部分,即图像预处理模块、特征融合模块以及图像输出模块。图像预处理模块基于对比度增强函数、亮度增强函数和伽马校正函数对输入图像进行处理,获取表征不同增强方式及程度的图像序列。由于图像尘雾清晰化需要同时考虑图像的局部信息和全局信息,在空间金字塔池化和上下文信息聚合网络的基础上提出了能够实现双向的上下文信息提取的双金字塔模块,该模块包括2个空洞卷积的串联子块,其中1个子块是以对多个尺度的空洞卷积按尺度由小到大进行串联组成,另1个子块是以对多个尺度的空洞卷积按尺度由大小进行串联组成。图像输出模块主要对特征融合层获取的特征进行处理,从而输出三通道图像,即为最终的尘雾清晰化的图像。为了获取训练数据,本文在煤矿井下清晰图像的基础上基于尘雾图像形成机理构建了较大规模的训练数据集。在训练的过程中,采用了最小平方误差损失函数和基于VGG网络的内容损失函数对网络进行优化。为评价本文提出的基于深度融合网络的清晰化算法的有效性,选取其他6种有代表性的清晰化算法进行对比。实验结果显示,本文算法在主观评价和客观评价方面都优于上述算法,表明本文算法能够有效解决过增强现象,并提升煤矿图像的清晰度和可视化效果。     

2D70铝合金不同环境低周疲劳性能研究

对2D70铝合金在试验室空气、湿空气、盐雾及盐雾＋SO2四种环境下进行低周疲劳试验,将得到的四种环境下的循环δ-ε曲线及应变一寿命曲线分别进行对比,得出结论：相同应变下,2D70铝合金随腐蚀环境增强,循环应力降低;相同应变下,2D70铝合金在盐雾及盐雾＋SO2两种环境下低周疲劳寿命相近,并且随着腐蚀环境的增强,低周疲劳寿命降低。     

Modelling the mitigation of lean hydrogen deflagrations in a vented cylindrical rig with water fog

The wide flammability range of hydrogen–air mixtures means that the generation and presence of significant quantities of hydrogen in a confined space will always present some likelihood that a deflagration or explosion might occur. Very fine water mist fogs have been suggested as a possible method of mitigating the overpressure rise should a hydrogen–air deflagration occur.     

试验汽轮机内湿蒸汽测量研究

汽轮机内部的湿蒸汽会对机组的运行效率、动叶片水蚀及机组运行寿命产生重要影响。介绍了国内外对于汽轮机湿蒸汽研究的概况,使用基于多波长消光法与光阻法测量原理结合的湿蒸汽测量集成探针系统,对某汽轮机末级湿蒸汽1次、2次水滴进行了实测研究,介绍了1次水滴与2次水滴的测量方法及数据处理过程,给出了包括1次水滴湿度与2次水滴数目及粒度分布的计算结果。结果表明,沿着叶高1次水滴湿度与2次水滴粒度渐增,而经过运用除湿措施的末级后2次水滴平均粒径减小、粒度分布变窄。     

C_2液相加氢用固定床鼓泡反应器的适宜操作区

本文以氢气为气相介质、甲苯为液相介质。研究了:气液通过φ39固定床鼓泡反应器时。反应器内流体的流动状态,确定了适宜的操作区,以便应用于碳二液相催化选择性加氢脱炔工艺研究。