膜技术应用进展   总被引：3，自引：0，他引：3  

王玉宾  孙伟  黄伟 《矿产与地质》2003,17(1):96-99

从膜分离方法的基本原理到材料及应用作了较为详细的介绍，并分析了今后膜技术在食品、卫生及水处理领域的应用与发展前景。  相似文献   

Natural deterioration and conservation treatment of the granite standing Buddha of Daejosa Temple, Republic of Korea     

C. H. Lee  S. W. Choi  M. Suh 《Geotechnical and Geological Engineering》2003,21(1):63-77

The Daejosa Buddha is formed of highly weathered coarse grained biotite granite. The main body is dark green due to a covering of lichens. The main body of the Buddha has developed nearly vertical, horizontal and oblique joint systems. Results of physical properties for the rock samples from the Daejosa Buddha are lower than for normal fresh granite as the primary minerals of the host rocks have been altered to clay and iron hydroxide minerals. Spore and mycelium of green algaes and some plants cover the surface of the standing Buddha and fill the pore space of the surrounding rocks. Considering the weathering and state of deterioration, the Buddha statue requires conservation treatment. Restoration may be largely divided into the head part, upper and lower parts, and the back side of the Buddha. The head and the cap rock were joined and restored with unslaked lime filling. The head and stone crown of the Buddha were fitted and restored using an epoxy type resin with high viscosity that was mixed with granite powder and talc as petro-fillers. For the back side, resin was applied for reinforcement. Araldite and hardener of low viscosity that were used with the addition of glass fibers. Finally, texture and color matching treatments were carried out.  相似文献   

Anisotropy of magnetic susceptibility of heated rocks     

Bernard Henry  Diana Jordanova  Neli Jordanova  Christine Souque  Philippe Robion 《Tectonophysics》2003,366(3-4):241-258

Heating produces changes, which does not always correspond to simple enhancement of the magnetic fabric. Two methods are proposed to determine the anisotropy of magnetic susceptibility of the ferrimagnetic minerals formed or that have disappeared by chemical change during successive heating. The first diagonalizes the tensor from the difference between each tensor term before and after heating. The second employs linear regression for each tensor term made with the values obtained throughout a thermal treatment. When the same magnetic fabric is obtained from several thermal steps, it cannot be related to randomly oriented ferrimagnetic minerals. Instead, the newly formed fabric must be related to characteristics of the pre-existing rock. By comparing this ferrimagnetic minerals fabric with the initial whole rock fabric, we can distinguish cases where heating simply enhances pre-existing fabric from those where thermal treatment induces a different fabric. Relative to the pre-heating fabric, this different fabric may simply be an inverse fabric or one whose principal susceptibility axes are oriented in a different direction, related to petrostructural elements other than those defining the initial fabric.  相似文献   

外部规模经济与国际贸易区域化及其对中国的启示     

朱华友  赵琪  丁四保 《世界地理研究》2003,12(3):8-13,43

在世界贸易格局的形成中，贸易区域化现象引人注目。文章运用外部规模经济理论对这种现象予以新的解释，即在世界经济一体化浪潮中，一些地理位置邻近、文化背景相似的国家为获取有利的贸易区位，通过产业分工、对内合作和对外竞争形成区域贸易集团，并由此产生“区域外部规模经济”。作者认为，为获得有利的贸易区位和区域外部规模经济，中国一方面要加强与国际贸易区域组织的合作，另一方面要加强次区域及国内地区间的合作。  相似文献   

人工边坡治理设计最优坡角确定方法浅析     

段启杉  江明 《贵州地质》2002,19(4):271-273

人工边坡治理包含削坡开挖、坡体加固、土地征用、工程环境等内容，各子项工程成本均与设计开挖坡角有密切关系。作者阐述了设计最优坡角的工程意义，并通过工程技术与成本诸要素分析，提出了最优坡角的确定方法。  相似文献   

富春江大桥软基处理   总被引：1，自引：0，他引：1  

单红军  张邦瑞 《安徽地质》2002,12(4):255-257,272

通过对富信公路富春江大桥路段环境及水文地质调查,采取粉体旋喷桩处理下卧软基,并适当降低路基高度等措施,使新建路基得以稳定,文中介绍了具体情况和做法.  相似文献   

确定隧道外水压力的地下水流模型--读<深埋隧道外水压力计算的解析-数值法>一文随笔   总被引：12，自引：0，他引：12  

陈崇希  刘文波  彭涛 《水文地质工程地质》2002,29(5):62-64

分析当前普遍使用的“折减系数法”确定隧道外水压力中存在的问题，建议采用地下水流数值模拟法，并提出建模中的注意事项，特别是边界条件的确定。  相似文献   

观光塔边坡的稳定性分析与治理措施   总被引：1，自引：0，他引：1  

莫海鸿  朱玉平 《岩土力学》2004,25(Z2):487-490

分析了观光塔边坡的失稳破坏机制,并应用不确定性方法对该边坡进行了稳定性分析,结果表明,坡脚陡倾岩层是阻止该边坡继续滑移的有利因素,地下水是控制该边坡稳定的主导因素.最后,基于机制分析提出了针对性的治理措施.  相似文献   

软土地基新老路堤搭接的岩土工程问题和处理对策   总被引：2，自引：0，他引：2  

胡汉兵  饶锡保  陈云 《岩土力学》2004,25(Z2):321-324

结合武汉绕城公路,针对软土地基上新老路堤搭接中存在的岩土工程问题进行了分析,提出了处理对策,并通过理论分析和原位监测成果进一步说明了采用粉喷桩处理软土地基、土工格栅增强新填路堤刚度、结合面开挖反坡和控制路堤填筑质量是十分必要的.  相似文献   

Geodatabase与城市排水系统规划集成的研究          下载免费PDF全文

龙瀛  贾海峰  程声通 《水科学进展》2004,15(4):436-440

Geodatabase是美国环境系统研究所(ESRI)提出的第三代地理数据模型,在分析和总结城市排水系统规划涉及的内容以及前人进行的有关GIS应用于城市排水系统规划的基础上,对Geodatabase数据模型与城市排水系统规划集成的优势进行分析,并提出了基于Geodatabase的辅助城市排水系统规划的新型解决方案。在北京市污水处理厂合理布局规划项目中,该解决方案得以成功应用,并被证明在城市排水系统建模、规划数据管理以及规划方案生成效率等方面,较传统的第二代地理数据模型更具优势。  相似文献