基于阿基米德螺线的磨盘挤出机数学模拟

介绍了阿基米德螺线磨盘挤出机的数学模拟,建立了磨盘的物理模型和数学模型,并给出了流场的速度分布和压力分布。采用CAD/CAM/CAE技术研究了磨盘转速及其槽深和槽宽对压力分布和剪切速率分布的影响。     

液氯液下泵故障分析及改进

分析了LSY40 -10/7型液氯液下泵气相部分、支撑管、出液接管、推力盘等部件烧毁,泵轴承断裂的原因,并提出了改进措施.     

Electro-dissolution of 30Nb–Ti alloys in methanolic sulfuric acid—Optimal conditions for electropolishing

The electro-dissolution behaviour of a (30 at.%) Niobium–Titanium (NbTi) alloy in non-aqueous methanolic sulfuric acid solution using the rotating disc electrode (RDE) was ascertained. The optimal condition for electropolishing and the mechanism were proposed. The influence of the rotation rate, process temperature and sulfuric acid concentration on the dissolution kinetics was investigated. The dissolution rate (limiting current) increases linearly with increase in rotation rate and follows a Levich behaviour confirming a mass transport controlled process. The temperature dependence in terms of Arrhenius plot renders an activation energy value of E_a = 16.1 kJ mol⁻¹ for the process. The dissolution rate shows a strong dependence on the sulfuric acid concentration (1 M, 3 M and 5 M). Higher sulfuric acid concentrations lead to decreased dissolution rates (limiting current). The dissolution process is mass transport controlled in all concentrations of sulfuric acid. From an electrochemical perspective, a 3 M sulfuric acid was chosen as optimum owing to better controllability of the material removal rate. The dissolving ions are the probable rate limiting species, indicating a compact salt-film mechanism. The average root mean square (RMS) roughness value for an electropolished surface was approximately 10 nm, which is significantly lower than a mechanically polished surface.     

Enhancement of electrocatalytic properties of carbonized polyaniline nanoparticles upon a hydrothermal treatment in alkaline medium

The electrocatalytic activity of carbonized polyaniline nanostructures (Carb-nanoPANI) towards oxygen reduction reaction (ORR), estimated in 0.1 mol dm⁻³ KOH solution, was significantly improved upon a hydrothermal treatment in 1 mol dm⁻³ KOH solution. Namely, the onset of ORR was shifted by ∼70 mV to more positive potentials, and the number of electrons consumed per O₂ molecule was enhanced in comparison to the original material. The number of electrons involved in ORR depended on loading, and with a loading of 0.5 mg cm⁻², for the potentials lower than −0.5 V vs SCE, the number of electrons approached 4. For this material, high stability of electrochemical behavior and resistance to the poisoning by ethanol was evidenced by potentiodynamic cycling.     

新一代串联式磨盘挤出机

本文简单介绍了串联式磨盘螺杆挤出机的结构特点,将新一代机型可挤出系统,加热冷却系统进行了阐述,通过实验方法对混合性能及混炼质量的影响因素进行了对比和研究,最终总结出有利于提高混炼质量的有效方法和方案。     

圆盘反应器中的PET缩聚过程

利用薄膜实验研究了PET缩聚过程反应和传质规律 ,建立了链增长、链降解反应动力学模型和泡沫脱挥时的传质速率方程 ;通过冷模实验研究了圆盘反应器中PET的混合、流动、成膜、膜表面更新以及传质规律 ;综合了反应和反应器研究结果 ,建立了圆盘反应器中的PET缩聚过程模型 ,对圆盘反应器中的PET缩聚过程进行了仿真分析 ,考察了温度、压力、停留时间、转速、催化剂浓度、负荷大小等各种因素的影响     

纳米吸附剂在卷烟降焦中的应用研究

介绍了合成纳米材料应用于香烟过滤嘴降低卷烟焦油量的研究。将纳米吸附剂施加于过滤嘴棒中 ,可提高嘴棒的吸附、过滤效率。本研究中利用自制的的纳米吸附剂可降低卷烟焦油量 4.4mg/支。     

盘式感应电动机主要尺寸的探讨

本文讨论了盘式轴向磁场感应电动机设计的关键点：主要尺寸的确定、主要尺寸与输出功率和转速间的关系、主要尺寸的最佳值等问题，旨在为盘式电机设计的独特性探讨性观点。     

盘式制动器摩擦温升的解析计算

在对盘式制动器摩擦热实验研究基础上，对制动副温度场模型进一步简化，指出了快捷准确的摩擦温升的解析计算方法，其结果与用有限元法计算和实验测试值十分吻合。     

盘形超声压电振子的抛光实验研究

应用盘形超声压电振子在抛光实验装置上对硅片进行了化学机械抛光,比较了附加行波超声振动的化学机械抛光与传统化学机械抛光的实际效果,实验结果表明,在相同的实验工况下,施加行波超声振动相对于不施加振动,能明显改善硅片化学机械抛光的表面质量。振子振幅的增大对改善硅片表面质量有利。