D0I:10.13374/j.issn1001053x.2003.02.025 VoL.25 No.2 王艳辉等：基于人工神经网络的地下矿山岩层移动研究 ·109· 8 Hechi Nielsen R.Theory of the back propagation neural eling of material behavior with neural networks [J].Jour- network [J].Proc of IJCNN,1989,1:593 nal of Engineering Mechanics Division,ASCE,1991,117 9 Ghaboussi J,Garret J H Jr,Wu X.Knowledge-based mod- (1):132 Research on Strata Movement in Underground Metal Mines Based on the Artificial Neural Network WANG Yanhui,CAl Sijing,SONG Weidong Civil and Environment Engineering School,University of Science and Technology Beijing,Beijing 100083,China ABSTRACT A prediction method of strata movement in underground metal mines is put forward in which the artificial neural network is applied,and selected factors influencing strata movement are dealt with by the fuzzy ma- thematic method.The results show that there is a strong nonlinear linking between the factors and strata movement angle,and the numerical value of movement angle has much in connection with the factors.It is proved that the scope of strata and surface movement due to mining can be predicted in theory. KEY WORDS artificial neural network;strata movement;subordinate degree Application of annexation principle to the study of thermodynamic properties of Ag-Bi-In metallic melts Jian Zhang Metallurgy school,University of Science and Technology Beijing,Beijing 100083,China ABSTRACT Based on the measured activities,the phase diagrams and the annexation principle,the calculating models of mass action concentrations for Ag-Bi and Ag-Bi-In melts have been formulated.The calculated results agree with practice and obey the mass action law,showing that the models formulated can reflect the structural char- acteristics of both melts.Meanwhile,it confirms that annexation principle is applicable to the Ag-Bi-In metallic mel- ts.The melts involving eutectic which give rise to phase separation,and in which activities exhibit positive deviation from Raoult's law is the basic cause of melts transforming from homogeneous to heterogeneous ones. KEY WORDS the mass action law;annexation principle;two phase melts;activity,mass action;concentration [Journal of University of Science and Technology Beijing(English Edition),2001,8(1):18]王 艳 辉 等 基 于 人 工 神 经 网络 的地 下 矿 山岩 层 移 动 研 究 ， ， ， ， 们 一 ， ， ， 恻刀 ， ’ 刀 肠 飞 ， ， ， 叭 ， ， 们。 即 勿 一 一 介“ ， ， ， ， ， 一 一 一 认、 ， 一 一 ， ， ， 印 邵 夕 ” 石 ， ， DOI ：10．13374／j ．issn1001－053x．2003．02．025