较粗高碳钢丝热镀锌断丝原因探索

分析较粗高碳钢丝在连续生产作业线上热镀锌时断丝原因，探索钢丝直径与锌辊直径的关系，总结出实用经验公式。     

浅论制碱工业的发展对制盐工业的影响

介绍了氯碱工业的发展概况和发展趋势，讨论了这种趋势对我国制盐工业产生的影响。这种影响主要表现在：高品质工业盐的生产，以卤代盐的发展以及盐碱企业的联合和制盐企业上规模上档次等方面。并提出了解和研究制碱工业有利于制盐工业更好地健康发展的观点。     

锥型面粉预混合机螺旋叶片的数学模型及造型设计

用复合函数的方法推导出了锥型面粉营养强化预混合机外螺旋叶片的数学模型,探讨了不同给定条件对设计结果的影响,提出了进行参数化3D图像结果生成的算法,并公布了应用AutoCAD内的AutoLISP语言编写的实际程序清单.生成的3D图像结果表明,本文提出的算法正确、可行.     

环量控制扑翼式获能器气动特性的数值研究

提出了一种采用环量控制的新型扑翼获能技术,首先对这种扑翼在不同折合频率下的获能效率进行了数值模拟,并与传统扑翼和表面施加协同射流控制扑翼的获能效率进行了对比,发现不同工况下对翼型尾缘部施加持续射流均能有效改善翼型的气动性能,使扑翼的能量转换效率显著提高,且提升幅度优于协同射流控制方法,表明该方法具有一定的开发应用潜力。此外,针对连续射流能耗较高的缺点进一步改进了射流施加策略,建立了四种不同射流喷射控制模式,对比研究了连续式、方波式、正弦式和三角波式射流模式下扣除射流能耗后采用环量控制扑翼的获能净效率,旨在以获取最高能量转换效率为目标的前提下尽可能降低射流所需能耗。不同射流模式下的能耗分析表明,连续式环量控制模式下所需能耗最高,方波式、正弦式和三角波式的能耗依次次之,因此扣除主动控制射流的能耗后,三角波式射流喷射模式下扑翼的获能净效率最高,比传统扑翼获能效率相比提升幅度最高可达22.2%,更具实际应用价值。     

喷流式退火炉炉内卷材尺寸对换热过程的影响

利用FLUENT软件对铝卷材喷流退火过程进行模拟计算,模型耦合求解炉内温度场及流场。讨论退火过程卷材规格不同对卷材截面换热的影响,得到卷重及宽度不同时料卷芯部与端部温升的变化规律。     

Defects caused by precipitation of in liquid copper–nickel–aluminium–bronze alloys dissolved carbon and removal by treatment of melt

Castings made of copper–nickel–aluminium bronze (CuAl₁₀Fe₅Ni₅) alloys regularly show defects in the thick, slowly solidifying parts of the castings, which give rise to rejections. Metallographic examination has been made on material of scrap castings showing porosity accompanied with film-like inclusions located beside the iron rich κ_II phases. Investigations of large failed cast structures of copper–nickel–aluminium bronze show the same characteristic defects on which fatigue cracks initiate and grow. Investigation has been made to the nature and the cause of appearance of the film-like inclusions. Microanalysis indicates a high intensity of carbon at the place of the film-like inclusions. Hereafter, an investigation has been made into the solubility of carbon in liquid copper–nickel–aluminium bronze, and it is found that besides hydrogen, also carbon is soluble in copper–nickel–aluminium bronze alloys. The appearance of the carbon as flakes in the fracture surface of materials with defects does suspect there is a nucleating effect on the formation of microporosity causing the defects. To prevent the formation of the casting defects by the interaction between solved hydrogen and carbon, it is necessary to remove the carbon as far as possible by treatment of the melt.     

Use of grape by‐product as a source of dietary fibre and phenolic compounds in sourdough mixed rye bread

The study evaluated the effect of grape by‐products (GP) on the chemical composition, soluble (SDF) and insoluble (IDF) dietary fibre, phenolic compounds and antioxidant activity (AA) and organoleptic characteristics of sourdough mixed rye bread. The following samples of sourdough mixed rye bread were prepared: control bread (BC) and breads with GP at four different levels: 4%, 6%, 8% and 10%. Addition of GP significantly improves dietary fraction contents, as bread with a 10% addition of GP accounts for 39% and 37% higher contents of IDF and SDF than BC. The assay of radical‐scavenging activity and reducing ability showed that GP addition greatly enhanced antioxidant properties of mixed rye breads. Profiles of phenolic compounds of supplemented breads were dominated by procyanidin B1 and B2, catechin, epicatechin, caffeic acid and myricetin. With an increase in the level of GP, the hardness and gumminess of the bread significantly increase. Although both BC and supplemented breads showed common volatile compound profiles, there were slight differences in the concentrations of those components. Sensory evaluation of GP‐enhanced breads revealed that a maximum of 6% GP could be incorporated to prepare acceptable products.     

Second-order data obtained from differential pulse voltammetry: Determination of tryptophan at a gold nanoparticles decorated multiwalled carbon nanotube modified glassy carbon electrode

Three-way data obtained from different pulse heights of differential pulse voltammetry (DPV) was analyzed using multivariate curve resolution by alternating least squares (MCR-ALS) algorithm. Differential pulse voltammograms of tryptophan were recorded at a gold nanoparticles decorated multiwalled carbon nanotube modified glassy carbon electrode (GCE/MWCNTs-nanoAu). The determination of tryptophan was performed even in the presence of unexpected electroactive interference(s). Both the simulated and experimental data were non-bilinear. Therefore a potential shift algorithm was used to correct the observed shift in the data. After correction, the data was augmented and MCR-ALS was applied to the augmented data. A relative error of prediction of less than 8% for the determination of the simulated analyte of interest and tryptophan in synthetic samples indicated that the methodology employing voltammetry and second-order calibration could be applied to complex analytical systems.     

A Study on the Removal of Humic Acid Using Advanced Oxidation Processes

Abstract

Humic acid (HA) removal using advanced oxidation processes (AOPs) was investigated, particularly UVA/H₂O₂ and photo Fenton‐like process (UVA/Fe(III)/H₂O₂). Changes in the UV₂₅₄ absorbance, dissolved organic carbon (DOC), apparent molecular weight (AMW) distribution, and the Trihalomethane formation potential (THMFP) of the organics were monitored. UVA/Fe(III)/H₂O₂ based process was found to be effective in removing more than 80% DOC and 90% UV₂₅₄ absorbance. Differences in the reduction profiles of AMW distributions for UVA/Fe(III)/H₂O₂ based process and UVA/H₂O₂ process were observed, with the latter showing preferential removal of a certain molecular weight range. Selected samples were then fractionated into four components: very hydrophobic acids (VHA), slightly hydrophobic acids (SHA), hydrophilic charged (CHA), and hydrophilic neutral (NEU). The HA used is found to consist mostly of VHA fraction that is very susceptible to AOP treatments. The results illustrate that the degradation process occurred via the fragmentation of VHA fraction to form SHA, CHA, and NEU fractions.     

热电联产机型配置在钢铁企业的应用分析

分别从投资,效率、适应性、维护成本等多方面比较了燃气-蒸汽联合循环和常规发电机组的优缺点,指出在目前阶段,钢铁厂常规发电机组在综合性能上仍然占有一定的优势。