Analytical solution for the axisymmetric plane strain electroelastic dynamics of a special non-homogeneous piezoelectric hollow cylinder

By virtue of the introduction of a dependent variable and the separation of variables technique, the axisymmetric plane strain electroelastic dynamic problem of a special non-homogeneous piezoelectric hollow cylinder is transformed to a Volterra integral equation of the second kind about a function with respect to time, which can be solved successfully by means of the interpolation method. Then the solutions of displacements, stresses, electric displacements and electric potential are obtained. The present method is suitable for a piezoelectric hollow cylinder with an arbitrary thickness subjected to arbitrary mechanical and electrical loads. Numerical results are finally presented.     

企业信息化

主要介绍企业信息化的定义、内涵、外延、分类、层次及意义，并根据国内企业信息化建设的经验教训，提出了几点值得重视的建议。     

缝洞型碳酸盐岩油藏流动单元概念和研究方法探讨

流动单元对于提高油田采收率具有很大的实际意义,该项研究在砂岩油藏研究中已取得较大进展。对于缝洞型碳酸盐岩油藏,由于岩石结构构造、成岩后生作用、构造断裂作用、溶蚀作用等多因素对储集空间的影响,已有的流动单元概念及研究技术方法难于应用。以塔河油田为例,针对缝洞型碳酸盐岩地质特征,论证了碳酸盐岩储层渗流屏障的存在及其类型,探索性提出区别于砂岩油藏的缝洞型碳酸盐岩储层流动单元的概念。提出的研究思路和方法包括;油藏压力趋势分析法、井间生产干扰分析法、流体性质差异分析法、井间干扰试井法。结合储层发育特征,初步建立了缝洞型碳酸盐岩流动单元的划分标准。     

参数强迫激励下非线性振子尖点型奇点的分叉

本文首先研究了不具有Z_2—对称性时的规范形理论和退化向量场的普适开折理论。然后利用这些理论研究了参数激励与强迫激励联合作用下非线性振动系统的尖点型奇点的余维2退化分叉。     

略论贵州省化工企业职业教育的发展

从目前市场需求和就业率出发，进行形势分析，提出优化专业设置、加强实践环节、提高高职学院办学层次、推进“双证书”制度等改革方法，以促进化工职业教育的发展。     

油基钻井液的推广及循环利用

针对普通水基钻井液在钻进中强、强水敏性油藏时会造成储层污染、产量降低的问题,指出了油基钻井液在钻进该类油藏时的优势和其成本高、对生态环境有污染的缺点。为了大面积推广应用油基钻井液,重点介绍了油基钻井液的特性和稳定性影响因素,并通过室内评价证明了油基钻井液在油层保护中的良好效果,着重阐述了油基钻井液在王庄油田的现场应用情况,并探讨了油基钻井液的循环利用技术。研究结果表明,油基钻井液不仅具有良好的油层保护效果,而且具有较好的社会经济效益。     

新钢炼铁系统技术进步

通过加强精料、实施技术改造、优化高炉操作等措施，新钢炼铁生产取得了明显的进步，技术经济指标明显改善。     

UCT测井技术在河南油田的应用

介绍了超声波固井质量检测仪(UCT)的原理、结构及测井方法，分析了UCT测井资料的应用情况。实践表明，UCT能准确地探测套管腐蚀，直观评价水泥与套管、水泥与地层一、二界面的胶结质量。     

Syngas production via combined oxy-CO2 reforming of methane over Gd2O3-modified Ni/SiO2 catalysts in a fluidized-bed reactor

In this research, Ni/SiO₂ catalyst was modified with different amount of Gd₂O₃ and characterized with temperature-programmed desorption of CO₂ (CO₂-TPD) and NH₃ (NH₃-TPD), temperature-programmed reduction with H₂ (H₂-TPR) and X-ray diffraction (XRD). It was found that Gd₂O₃-modified Ni/SiO₂ catalysts possessed higher CO₂ adsorption and activation ability due to the formation of surface carbonate species. H₂-TPR and XRD characterizations found that the strong interaction among nickel, Gd₂O₃ and SiO₂ took place, which improved the dispersion of Ni. Gd₂O₃-modified Ni/SiO₂ catalysts exhibited higher activity and stability for the combined oxy-CO₂ reforming of methane in fluidized-bed reactor. The H₂/CO ratio in produced syngas could be controlled via controlling reaction temperature and CO₂/O₂ ratio in feed.