Electronic properties of thermally formed thin iron oxide films

The oxide layer, present between an organic coating and the substrate, guarantees adhesion of the coating and plays a determinating role in the delamination rate of the organic coating. The purpose of this study is to compare the resistive and semiconducting properties of thermal oxides formed on steel in two different atmospheres at 250 °C: an oxygen rich atmosphere, air, and an oxygen deficient atmosphere, N₂. In N₂, a magnetite layer grows while in air a duplex oxide film forms composed by an inner magnetite layer and a thin outer hematite scale. The heat treatment for different amounts of time at high temperature was used as method to sample the thickness variation and change in electronic and semiconducting properties of the thermal oxide layers. Firstly, linear voltammetric measurements were performed to have a first insight in the electrochemical behavior of the thermal oxides in a borate buffer solution. Electrochemical impedance spectroscopy in the same buffer combined with the Mott-Schottky analysis were used to determine the semiconducting properties of the thermal oxides. By spectroscopic ellipsometry (SE) and atomic force microscopy (AFM), respectively, the thickness and roughness of the oxide layers were determined supporting the physical interpretation of the voltammetric and EIS data. These measurements clearly showed that oxide layers with different constitution, oxide resistance, flatband potential and doping concentration can be grown by changing the atmosphere.     

An Asymptotic Approach to Second-kind Similarity Solutions of the Modified Porous-medium Equation

The problem of a spreading ground-water mound of liquid in a porous medium, situated on an impermeable horizontal solid layer is revisited. The mathematical formulation for this problem is given by the modified porous medium equation. A global condition in form of an energy integral is derived, describing the loss of liquid in the porous medium. This yields the necessary condition that enables the aymptotic derivation of the similarity exponents for the similarity solution of second kind. The method developed here, is further applied to the corresponding dipole problem, when instead of an energy integral another conservation law, the first moment integral, is considered. I dedicate this article to the memory of Julian D. Cole, who has been a great inspiration to me and to the Applied Mathematics community in general for his profound impact on the development of Perturbation Methods.     

高层建筑结构构思与建筑创作

本文通过实例探讨了高层建筑创作合理进行结构构思，处理建筑功能，技术与艺术矛盾的方法和规律。     

基于信息熵的不完备信息系统粗集模型拓展

分析几种已有的针对不完备信息系统的粗集拓展模型基础上,提出了一种基于信息增益的粗集拓展模型.在对各属性重要性排序的前提下,对不完备信息系统进行进一步的粗集模型拓展,通过实例说明该模型更符合人的主观要求和客观现实.     

产品生态设计观念与绿色包装设计

文章对产品生态设计发展趋势和包装观念演变进行了分析，寻找其中共同的发展方向和主导因素，并结合现今包装设计的宏观发展，以绿色设计为基点，提出了实施绿色包装设计的原则性方法和内容。     

Analysis of Photoelectric Hybridization Measurementon Shearing Force for Flat Shearer

ＡｎａｌｙｓｉｓｏｆＰｈｏｔｏｅｌｅｃｔｒｉｃＨｙｂｒｉｄｉｚａｔｉｏｎＭｅａｓｕｒｅｍｅｎｔｏｎＳｈｅａｒｉｎｇＦｏｒｃｅｆｏｒＦｌａｔＳｈｅａｒｅｒＱＵＺｈｉＨａｏＡｎａｌｙｓｉｓｏｆＰｈｏｔｏｅｌｅｃｔｒｉｃＨｙｂｒｉｄｉｚａｔｉｏｎＭｅａｓｕ...     

粘性流体绕流圆管的边界层厚度的局部相似性解法

本文分析了粘性流体绕流圆管时边界层厚度的一种局部相似性解法。根据相似性解原理，将流体在圆管上形成的二元曲面转化为若干段，把每一段近似处理成一个楔形体斜面，把相似性解用于每一段，并考虑界面上的修正，就可以得到边界层的物理参数。计算表明，这种方法是可行的。     

落实现代营销观念 促进企业健康发展——兼论造纸企业营销管理的改进

结合中国造纸企业的实际,阐述了落实现代营销观念的意义和要点,探讨了加强营销管理的重要举措,有助于指导造纸企业的健康发展.     

煤矿瓦斯的综合治理与利用研究

针对邯郸某矿的实际状况,提出综合治理瓦斯的新思路:①通过相似实验、数值模拟计算、现场测试,搞清煤矿瓦斯的分布规律;②改变观念,将治理和利用同步考虑;③用生物技术治理瓦斯,使治理方法多元化.拓展了"综合"的内涵和外延,具有现实意义.     

设计环节成本控制

设计环节是处理技术与经济关系的关键环节，应在设计阶段很好地控制工程造价，推行设计招标和限额设计，提高设计质量，严格控制变更。