Inhibition effect of methyl violet on the corrosion of cold rolled steel in 1.0 M sulfuric acid solution

The inhibition effect of methyl violet (MV) on the corrosion of cold rolled steel (CRS) in 1.0 M sulfuric acid (H₂SO₄) was investigated by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods. The results show that MV is a good inhibitor, and inhibition efficiency increases with inhibitor concentration, while decreases with the temperature. The adsorption of MV on CRS surface obeys Langmuir adsorption isotherm equation. The thermodynamic parameters of adsorption enthalpy (ΔH°), adsorption free energy (ΔG°) and adsorption entropy (ΔS°) are calculated and discussed. Potentiodynamic polarization curves show that MV acts as a mixed-type inhibitor in sulfuric acid. EIS exhibits one capacitive loop which indicates that the corrosion reaction is controlled by charge transfer process. Inhibition efficiency values obtained from weight loss, polarization and EIS are in reasonably good agreement. The adsorbed film on CRS surface containing optimum dose of MV was investigated by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Depending on the results, the inhibitive mechanism is proposed from the viewpoint of adsorption theory.     

低温等离子体降解木质素磺酸钠的研究

将木质素磺酸钠水溶液通过空气气动法雾化,采用介质阻挡放电低温等离子体对其中的木质素磺酸钠进行降解。以紫外可见光谱(UV)、红外光谱(FTIR)和1H NMR谱等对降解前后的木质素磺酸钠进行了表征,结果表明,利用本实验方法降解木质素磺酸钠可行。实验同时考察了电极间隙、输出电压、催化剂用量、反应时间等工艺条件对木质素磺酸钠降解率的影响。实验结果表明,以硫酸铜为催化剂,在电极间隙为2 cm、输出电压为3 000 V、频率为10 kHz、反应时间为2.3 ms、催化剂用量为3.2%的条件下,质量浓度为1 g/L的木质素磺酸钠的降解率可达50%。     

低温快烧金光釉的研制

作者以正交试验法研究探讨了多种金属氧化物对金光釉产生金属光泽及釉面质量的影响，采用快速烧成的工艺探索了金光釉快速烧成的可行性，并在氧化还原不同的气氛下验证了金光釉对气氛的适应性，从理论上分析了金光釉产生金属光泽的机理。     

CO2 Hydrogenation to Methanol Over Cu/ZnO/Al2O3 Catalysts Prepared by a Novel Gel-Network-Coprecipitation Method

A novel gel-network-coprecipitation process has been developed to prepare ultrafine Cu/ZnO/Al₂O₃ catalysts for methanol synthesis from CO₂ hydrogenation. It is demonstrated that the gel-network-coprecipitation method can allow the preparation of the ultrafine Cu/ZnO/Al₂O₃ catalysts by homogeneous coprecipitation of the metal nitrate salts in the gel network formed by gelatin solution, which makes the metallic copper in the reduced catalyst exist in much smaller crystallite size and exhibit a much higher metallic copper-specific surface area. The effect of the gel concentration of gelatin on the structure, morphology and catalytic properties of the Cu/ZnO/Al₂O₃ catalysts for methanol synthesis from hydrogenation of carbon dioxide was investigated. The Cu/ZnO/Al₂O₃ catalysts prepared by the gel-network-coprecipitation method exhibit a high catalytic activity and selectivity in CO₂ hydrogenation to methanol.     

对水泥生料易烧性试验方法的改进

正0前言水泥生料易烧性是评价水泥原料和生料的重要工艺指标,是正确选择原料、设计生料、确定生料准备方法以及保证高产低耗的重要依据和参数[1]。目前,水泥生料的易烧性都是按照GB/T26566—2011《水泥生料易烧性试验方法》进行试验。但是在实际应用过程中发现,利用该标准方法进行检测时,由于加水量小而不易拌匀,且试体太小需反复制备试体。同时煅烧时需要在温度稍低的高温炉内先预烧,然后取出再放入更高温度的高温炉内煅烧,且煅     

自分散法制SiC窑具的研究

利用自分散法进行了低温烧成ＳｉＣ窑具的研究,对各种金属粉末及供氧剂作了试验,结果表明：这种地于研制具有良好热稳定性的ＳｉＣ窑具制品是可行的。     

遗传算法特征选取中的几种适应度函数构造新方法及其应用

针对遗传算法特征选取技术,提出4种适应度函数构造方法,即,基于改进的距离判据、基于平均值方差比、基于Fisher判别准则以及基于最近邻分类法的适应度函数,并通过仿真实例对方法进行了验证。最后,将新方法应用于转子故障诊断,结果表明:笔者提出的遗传算法特征选择的4种适应度函数的正确有效性。     

核黄素在废水处理过程中的荧光光谱特性研究

废水处理过程中会产生核黄素,其含量在一定程度上能够反映生物反应器的运行状态。本文采用荧光光谱法,针对废水处理过程中核黄素的自身的浓度效应、pH值和离子强度与核黄素的荧光光谱特性之间的关系进行了相关研究,为废水处理过程中生物反应器的参数控制提供相关数据,以进一步提高厌氧降解效率。     

基于一维测头准双曲面齿轮齿面偏差的测量

提出了基于一维测头准双曲面齿轮齿面偏差的测量及误差补偿方法。规划了齿面测量网格区域，并计算得到网格节点的坐标值和单位法矢。运用复杂曲面测量原理及误差补偿理论，建立了偏差数据补偿修正的计算式，得到了真实齿面在法线方向的偏差。在国产测量中心上使用一维测头对实际产品进行了齿面偏差测量，其结果与使用三维测头的M＆M3525测量中心的测量结果基本一致，从而验证了该测量方法的可行性和正确性。     

基于压电陶瓷的振动能量捕获技术现状及展望

分析了压电式振动能量捕获原理;针对提高振动能量捕获量和捕获效率这两个目标,对当前国内外在新型压电材料、压电振子性能研究与结构配置及高效电路等方面所作的研究进行了详细论述;指出向微能源器件、集成自供电系统发展和从旋转机械中捕获能量是压电陶瓷振动能量捕获技术的研究前景。