期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
微破裂-缝合机制及热液围岩蚀变过程中元素迁移的质量平衡估计——以河台金矿田为例 被引量:1
1
作者 周永章 《矿物岩石地球化学通报》 CAS CSCD 1993年第3期116-118,共3页
粤西河台金矿田是80年代发现的典型蚀变糜棱岩型金矿床。它的形成在很大程度上受海西-印支期韧性剪切带和热液围岩蚀变作用的控制。研究发现,微破裂-缝合循环是构造变形作用对热水溶液迁移的一种重要控制机制;寻找数学不变量是正确估计... 粤西河台金矿田是80年代发现的典型蚀变糜棱岩型金矿床。它的形成在很大程度上受海西-印支期韧性剪切带和热液围岩蚀变作用的控制。研究发现,微破裂-缝合循环是构造变形作用对热水溶液迁移的一种重要控制机制;寻找数学不变量是正确估计热液蚀变过程中元素实际迁移的重要前提。 展开更多
关键词 微破裂-缝合机制 定和制约 质量平衡估计 元素迁移
下载PDF
Parameter identification and pressure control of dynamic system in shield tunneling using least squares method 被引量:10
2
作者 LI Shou-ju CAO Li-juan +1 位作者 SHANGGUAN Zi-chang LIU Bo 《Journal of Coal Science & Engineering(China)》 2010年第3期256-261,共6页
An estimation approach using least squares method was presented for identificationof model parameters of pressure control in shield tunneling.The state equation ofthe pressure control system for shield tunneling was a... An estimation approach using least squares method was presented for identificationof model parameters of pressure control in shield tunneling.The state equation ofthe pressure control system for shield tunneling was analytically derived based on themass equilibrium principle that the entry mass of the pressure chamber from cutting headwas equal to excluding mass from the screw conveyor.The randomly observed noise wasnumerically simulated and mixed to simulated observation values of system responses.The numerical simulation shows that the state equation of the pressure control system forshield tunneling is reasonable and the proposed estimation approach is effective even ifthe random observation noise exists.The robustness of the controlling procedure is validatedby numerical simulation results. 展开更多
关键词 parameter identification least squares method state equation shield tunneling
下载PDF
A mass and energy estimation for the hydrogen utilization in the iron-making process 被引量:6
3
作者 Wan Ho KIM Dong Joon MIN 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第7期1655-1660,共6页
The possibility of using hydrogen to lower CO 2 emissions in the iron-making process was confirmed by the heat and mass balances in the blast furnace operation. The mass and heat balances for hydrogen utilization in t... The possibility of using hydrogen to lower CO 2 emissions in the iron-making process was confirmed by the heat and mass balances in the blast furnace operation. The mass and heat balances for hydrogen utilization in the blast furnace were estimated by using the basic concept of RIST operating diagram. In this study, the RIST operating diagram was modified to be suitable for representing the operation with respect to hydrogen, where the RIST operating diagram is a graphical representation of heat and mass balance in blast furnace operation. RIST operating diagram was applied here to some individual parameters of interest such as H 2 injection in blast furnace process to reduce coke (carbon consumption). It was observed that the point W moved to the right in the RIST operating diagram under the condition of increasing hydrogen injection at tuyere, which originates from the contribution of gas composition (O/H 2 ) equilibrated with Fe/FeO at a certain temperature. Point P also moved downward due to heat requirement with respect to hydrogen utilization, by which the new RIST operating diagram for hydrogen utilization was able to be constructed. Under the condition of hydrogen injection, the expected overall carbon consumption in the blast furnace decreased due to the contribution of hydrogen. 展开更多
关键词 HYDROGEN carbon consumption (CO2 emission) mass and heat balances RIST operating diagram blast furnace
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部