Validity of dynamic electrochemical impedance spectra of some amine corrosion inhibitors in petroleum/water corrosive mixtures by Kramers-Kronig transformation

In our previous works, the corrosion inhibition properties of propylamine (PA), iso-propylamine (i-PA), butylamine (BA), tert-butylamine (t-BA), hexylamine (HA), ethylenediamine (EDA), diethanolamine (DEA), 3-amino-1-propanol (3-AP), 2-dimethylethanolamine (2-DEA), cyclohexylamine (CHA), N-methylcyclohexylamine (N-MCA) and dicyclohexylamine (DCHA) have been investigated by means of electrochemical impedance spectroscopy (EIS) with a carbon steel rotating disc electrode in some petroleum/water corrosive mixtures containing acetic acid and NaCl at 25 °C. In this work, the Kramers-Kronig transformations (KKTs) were applied to evaluate the validity of the impedance data of these amine compounds in hydrodynamic condition. The results obtained showed that experimental impedance data did not satisfy in K-K relations completely viz. indicated some errors. These errors were related to stray capacitances, external transmission line effects, pits formation and change in interface during data acquisition at high and low frequencies regions. In addition, the selection of a suitable equivalent circuit strongly emphasized to better interpret of EIS data which in turn cause better resulted KKTs spectra. With considering obtained transformations, more effective inhibitor was selected with regard to its charge transfer resistance, the corrosion capacitance and well satisfying in K-K relations.     

小型水库溃坝洪水演算探讨

本文简要介绍了现有溃坝洪水的计算方法,根据新疆奎屯河"87"溃坝性洪水演算实例.推荐了一种简单可靠的适合小型水库溃坝洪水计算的方法.     

泥岩压实动态分析法定量评价石油初次运移

在分析影响油气初次运移主要因素的基础上，剖析应用泥岩压实静态分析方法研究油气初次运移的局限性，提出应用泥岩压实动态分析方法定量评价油气初次运移的观点，并建立了相应的地质模型、数学模型和模拟流程。以栓辽盆地乾长凹陷为例，对主要烃源层青山口组进行压实动态分析，并估算其油气初次运移量，计算结果与其它多种方法计算结果以及前人计算结果十分接近。     

气化炉自动建模系统研究

为了减轻建模人员在建模公式推导、逻辑关系推导和编制仿真程序的工作量，设计了气化炉自动建模系统。该系统在反应物为多种气体、多种固体（均考虑为单筛分）的条件下，按照小室模型的框架自动列写相应各个物质的质量、能量平衡方程，并自动生成相应的计算机程序，方便仿真计算。由于该系统避开了工程中常用的纯数值建模的思路，采用了新的数学工具－以符号运算特长的计算机代数系统为计算平台，才使得该系统具有强大的逻辑关系推导能力。该系统在某气化炉的建模过程中得到了验证和示范，事实表明：该系统大大减少了气化炉的建模工作量，特别是减少由于化学反应假定的不同带来的建模复杂性，对于建模与仿真研究新方法的突破有所贡献。     

全密封变压器用波纹油箱的波纹高计算

介绍了全密封变压器所用的液纹油相的波纹筋高的计算方法，并用试验进行了验证。     

从头算法对甲基磺酸拉曼光谱振动频率指认

对液态的甲基磺酸进行了拉曼光谱测定。采取从头算法用各种不同的基组 (最大的基组为MP2 / 6 -311+G( 2d ,2 p) )对甲基磺酸的结构和光谱进行了计算 ,得到了甲基磺酸的结构参数及稳定构象信息。采用一个具有Ci 对称的二聚体模型解释了甲基磺酸的液态光谱。对单体和二聚体的甲基磺酸进行了简正坐标计算 ,结果表明二聚体结构是液态甲基磺酸聚积态分子的合理模型。     

利用5A284型铣齿机加工转盘螺旋锥齿轮探讨

利用引进设备5A284苏联铣齿机加工石油钻机转盘螺旋锥齿轮，建立计算程序并进行调整计算，详述了遇到的问题及解决方法，使所加工的锥齿轮质量良好。     

车载制氧机加装预冷装置的研究与实现

航空兵部队地面保障装备之一的车载移动式制氧机，采用封闭循环水冷却，由于受到使用条件的限制，多数情况下冷却效果不尽理想，加装蒸汽压缩预冷装置，即可较好地了和低冷却系统温度，提高制冷量和整机使用寿命，又可满足整车机动性，动力等技术要求。     

Progress in multilayer devices as X-ray optical elements

A new kind of mirror based on multilayering techniques gives the possibility of preparing artificial Bragg reflectors over all the X-UV range. The possibility to choose most of the parameters governing the reflectivity opens the possibility to get a very good efficiency, even under normal incidence. Main parameters, evaporating techniques and tests are described. Some example of recent results are compared to the theoretical predictions.     

表面粗糙度的自动确定

根据零件精度，在CAD系统中能够快速、准确地自动确定其表面粗糙度，从其间接关系上分析并推导出了一套实用的换算公式，并使用在某CAD中。