逐孔爆破技术在葛洲坝水泥厂矿山的应用

本文首先分析了澳瑞凯公司逐孔起爆技术的原理,介绍了澳瑞凯逐孔起爆技术的特点,其次详细地分析了澳瑞凯爆破技术在葛洲坝水泥厂矿山的应用情况。     

Eddy current analysis of thin metal container in induction heating by line integral equations

In recent years, induction‐heating cookers have spread rapidly. It is desirable to commercialize flexible and disposable food containers that are suitable for induction heating. In order to develop a good‐quality food container for moderate heating, the eddy currents induced in a thin metal plate must be accurately analyzed. The integral equation method is widely used for solving induction‐heating problems. If the plate thickness approaches zero, the surface integral equations on the upper and lower plate surfaces tend to become the same and the equations become ill‐conditioned. In this paper, we first derive line integral equations from the boundary integral equations under the assumption that the electromagnetic fields in the metal are attenuated more rapidly than those along the metal surface. Next, to test the validity of the line integral equations, we solve for the eddy current induced in a thin metal container in induction heating and obtain the power density imparted to the container and the impedance characteristics of the heating coil. We then compare the computed results with those obtained by the FEM. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 168(2): 20–27, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20813     

上海市长江隧道工程洞门中心坐标精确测定

根据上海市长江隧道工程贯通处洞门中心坐标测量的卖际情况，利用数学方法将空间三维的洞门钢环实测坐标拟合出三维方程，精确求取钢环中心的三维坐标。     

重钢搬迁项目平基土石方工程标段爆破方案探析

为了满足某重钢项目搬迁所需的技术标准,必须克服各种不利地形,而深挖高填工程数量大、传统施工速度慢、施工效率低下,因而,必须研究推广采用新的爆破技术,确保施工质量。     

Ionic conductivity improvement in primary pores of fuel cell catalyst layers: Electropolymerization of m-aminobenzenesulfonic acid and its effect on the performance

Catalyst layers of direct methanol fuel cells (DMFCs) are modified by in situ electropolymerization of m-aminobenzenesulfonic acid. By using electrochemical impedance spectroscopy and porosimetry, this modification is found to add polymer electrolyte into primary pores (<10 nm), where ionic resistance is high for lack of polymer electrolyte (i.e., Nafion), and the additional electrolyte successfully decreases the ionic resistance by 10-15% compared to the plain carbon surface with a slight ion-conductivity (>40 kΩ cm). In view of methanol oxidation characteristics, this modification decreases the resistance by ca. 25% (from 5.1 Ω cm² to 3.7 Ω cm²) at 0.6 V vs. DHE, resulting in the increase in the cell voltage of DMFC test by ca. 20 mV. The clear relation between the performance and the microstructures is concluded to be helpful to understand the performance of fuel cell electrodes in detail.     

多层球形手征介质透镜的焦点

应用并矢格林函数方法，给出了点源激励和阻抗匹配时多层球形手征介质透镜（Ｃｈｉｒｏｌｅｎｓ）的远区场分布；应用几何光学近似条件，得到了它的焦点计算公式．以双层和１０层手征介质球镜为例，考虑了手往导纳对焦点位置的影响．     

用光镜和电镜对气孔的分析研究

本文根据用光学显微镜和电子扫描显微镜对球铁件中的气孔缺陷进行的观察和研究,阐述了气孔的形貌特征,并附了典型的光镜和扫描电镜照片.文章认为:借助先进的仪器设备,对于判断气孔缺陷的性质和产生的原因,研究探讨其形成机理,提出防止缺陷产生的措施具有重要的意义.     

用加权残值最小二乘法计算下部组合钻具的变形和受力

下部组合钻具可简化为—受横向力和轴向力作用的多跨度的连续梁、本文用加权残值最小二乘法计算一个多扶正器钻具组合的变形和受办,给出计算钻头侧向力,扶正器的约束反力和扶正器处的内弯矩的理论公式。在计算过程中,本文考虑了扶正器不在同一直线上的情况。     

考虑曲率时汽轮发电机的运算电抗和等效电路

本文在极坐标下,求解汽轮发电机异步运行时向量磁位A的二维涡流方程,得出了交、直轴运算电抗及其等效电路;研完了考虑曲率和不计曲率时运算电抗间的联系.