Integrating the concept of ideological and political courses into the teaching of various professional courses not only means imparting patriotic knowledge and feelings, but also means paying attention to the developm...Integrating the concept of ideological and political courses into the teaching of various professional courses not only means imparting patriotic knowledge and feelings, but also means paying attention to the development of students all-round literacy in each course teaching and digging into ideological and political factors to form good personal literacy. Taking the course of Plane Composition as the main analysis object, this paper discusses the practical teaching innovation of "ideological and political education + thinking", combines the plane composition with the ideological and political idea, and takes the ideological and political idea as the guiding ideology of specific course practice, so that students can improve their understanding and recognition of ideological and political education while learning the course content. Through this combination of thought and practice, students can feel the value of ideological and political ideas to individuals in their study, further improve their learning ability and learning ideas in practical teaching and learn to look at their own study objectively.展开更多
The Ms6.2 Dayao, Yunnan, earthquake occurred on July 21, 2003, followed by a major Ms6.1 earthquake about 88 days later in the same region. Hypocenters of the two earthquakes are almost in the same place. Based on the...The Ms6.2 Dayao, Yunnan, earthquake occurred on July 21, 2003, followed by a major Ms6.1 earthquake about 88 days later in the same region. Hypocenters of the two earthquakes are almost in the same place. Based on the P wave first motion polarities of the two aftershock sequences recorded by temporary stations, we have studied the stress field in the aftershock zone and obtained the two stress field directions in Dayao region using the new version of PKU_Grid^Test Software provided by Chunquan Yu. Assuming that the rotation of the stress field is caused by the second main shock, we estimated the crustal stress value in the focal region by using the stress value calculation method proposed by Yongge Wan. The estimated maximum, intermediate and minimum principal stresses are 166.3 MPa, 158.7 MPa and 151 MPa, respectively, before the second main shock. The normal and shear stresses projected on the fault plane of the second main shock before it occurred are 157.3 MPa, 7.4 MPa, and are 158.8 MPa, 0.2 MPa after it occurred, respectively. The perturbed input parameters experiments attest the stability of the solution. The result shows that the preseismic shear stress is larger than the post-seismic one, and their difference corresponds to the stress drop approximately. The estimated compressive stress level is very high, but the differential stress is low. The result is helpful for friction coefficient estimation, plate motion simulation and related studies.展开更多
文摘Integrating the concept of ideological and political courses into the teaching of various professional courses not only means imparting patriotic knowledge and feelings, but also means paying attention to the development of students all-round literacy in each course teaching and digging into ideological and political factors to form good personal literacy. Taking the course of Plane Composition as the main analysis object, this paper discusses the practical teaching innovation of "ideological and political education + thinking", combines the plane composition with the ideological and political idea, and takes the ideological and political idea as the guiding ideology of specific course practice, so that students can improve their understanding and recognition of ideological and political education while learning the course content. Through this combination of thought and practice, students can feel the value of ideological and political ideas to individuals in their study, further improve their learning ability and learning ideas in practical teaching and learn to look at their own study objectively.
基金supported by the National Natural Science Foundation of China (40874022,41074072)Public Utility Research Project (200808053)973 program (2008CB425703)
文摘The Ms6.2 Dayao, Yunnan, earthquake occurred on July 21, 2003, followed by a major Ms6.1 earthquake about 88 days later in the same region. Hypocenters of the two earthquakes are almost in the same place. Based on the P wave first motion polarities of the two aftershock sequences recorded by temporary stations, we have studied the stress field in the aftershock zone and obtained the two stress field directions in Dayao region using the new version of PKU_Grid^Test Software provided by Chunquan Yu. Assuming that the rotation of the stress field is caused by the second main shock, we estimated the crustal stress value in the focal region by using the stress value calculation method proposed by Yongge Wan. The estimated maximum, intermediate and minimum principal stresses are 166.3 MPa, 158.7 MPa and 151 MPa, respectively, before the second main shock. The normal and shear stresses projected on the fault plane of the second main shock before it occurred are 157.3 MPa, 7.4 MPa, and are 158.8 MPa, 0.2 MPa after it occurred, respectively. The perturbed input parameters experiments attest the stability of the solution. The result shows that the preseismic shear stress is larger than the post-seismic one, and their difference corresponds to the stress drop approximately. The estimated compressive stress level is very high, but the differential stress is low. The result is helpful for friction coefficient estimation, plate motion simulation and related studies.
