The close relationship between the structure,evolution,and resources environment of the South China Sea is a current research focus and also a focal point of our study.In this paper,we use regional seismic sections to...The close relationship between the structure,evolution,and resources environment of the South China Sea is a current research focus and also a focal point of our study.In this paper,we use regional seismic sections to analyze the relationship between seismic facies and the structure and tectonic evolution of the northeastern South China Sea and propose new points about the structure and the direction of block（land mass） motion.First,the tectonic features are clear and can be divided into five different structural units which are both linked and independent of each other.Second,it doesn＇t matter if the South China Sea basin pattern is extensional,weakly compressive,or strongly compressive,the regional tectonic stress field is unified.For the first time we find that two shallow subduction zones are recognized in the seismic profiles.All the tectonic blocks have accordion-fold-style structures,converging in the east,and the South China Sea exhibits different stages of basin development：growth, maturity,end,and termination.The block subduction and regional block dip directions are all aligned with the regional stress field.展开更多
Corrugated steel web is folded along the longitudinal direction and has the mechanical properties such as axial compression stiffness corrugation effect, shear modulus corrugation effect, similar to that of an accordi...Corrugated steel web is folded along the longitudinal direction and has the mechanical properties such as axial compression stiffness corrugation effect, shear modulus corrugation effect, similar to that of an accordion. In order to study the lateral-torsional buckling of box beams with corrugated steel webs (BBCSW) under the action of bending moment load, the neutral equilibrium equation of BBCSW under the action of bending moment load is derived through the stationary value theory of total potential energy and further, along with taking Kollbrunner-Hajdin correction method and the mechanical properties of the corrugated web into consideration. The analytical calculation formula of lateral-torsional buckling critical bending moment of BBCSW is then obtained. The lateral-torsional buckling critical bending moment of 96 BBCSW test specimens with different geometry dimensions are then calculated using both the analytical calculation method and ANSYS finite element method. The results show that the analytical calculation results agree well with the numerical calculation results using ANSYS, thus proving the accuracy of the analytical calculation method and model simplification hypothesis proposed in this paper. Also, compared with the box beams with flat steel webs (BBFSW) with the same geometry dimensions as BBCSW, within the common range of web space-depth ratio and web span-depth ratio, BBCSW’s lateral-torsional buckling critical bending moment is larger than that of BBFSW. Moreover, the advantages of BBCSW’s stability are even more significant with the increase of web space-depth ratio and web depth-thickness ratio.展开更多
By analyzing several effective finger practices, it is possible to consolidate the basic skills to help students adjust and establish a good touch mode. This is an important pre-requisite for pursuing strength and spe...By analyzing several effective finger practices, it is possible to consolidate the basic skills to help students adjust and establish a good touch mode. This is an important pre-requisite for pursuing strength and speed during playing. The training method can be targeted to solve some common problems, and guide students to consciously feel the touch and the change of tone, listening with ears, controlling with fingers to achieve solid and soft balanced unity.展开更多
In early childhood education it is important to determine a child＇s ability or attitude towards different subjects Training and/or education geared towards these tendencies will not only ensure a more healthy future ...In early childhood education it is important to determine a child＇s ability or attitude towards different subjects Training and/or education geared towards these tendencies will not only ensure a more healthy future choice in education for the child but furthermore will enable the child to have a happier educational atmosphere in early childhood. Music education/training in early childhood is considered to be very important in early years. Music education/training, in the correct and proper context using tangible and feasible teaching techniques not only improves and develops a child＇s musical skills but also helps develop his/her personality. Two people who shared this view were Zolt^n Kod^ly and Shinichi Suzuki. Suzuki positively affected the educational systems worldwide with his approach to violin teaching and his ideas on early childhood pedagogy. Choosing between the Suzuki violin teaching methodology and the traditional violin teaching methodology is a personal decision. This article tries to objectively elaborate on different aspects of Suzuki and traditional violin teaching methodologies. Each methodology has its pros and cons and knowing what these are will help individuals to make a more educated choice.展开更多
基金the National Hi-Tech Research and Development Program of China(Grant No.2006AA09A101).
文摘The close relationship between the structure,evolution,and resources environment of the South China Sea is a current research focus and also a focal point of our study.In this paper,we use regional seismic sections to analyze the relationship between seismic facies and the structure and tectonic evolution of the northeastern South China Sea and propose new points about the structure and the direction of block（land mass） motion.First,the tectonic features are clear and can be divided into five different structural units which are both linked and independent of each other.Second,it doesn＇t matter if the South China Sea basin pattern is extensional,weakly compressive,or strongly compressive,the regional tectonic stress field is unified.For the first time we find that two shallow subduction zones are recognized in the seismic profiles.All the tectonic blocks have accordion-fold-style structures,converging in the east,and the South China Sea exhibits different stages of basin development：growth, maturity,end,and termination.The block subduction and regional block dip directions are all aligned with the regional stress field.
基金Projects(51408449,51778630)supported by the National Natural Science Foundation of ChinaProject(2018zzts189)supported by the Fundamental Research Funds for the Central Universities,China
文摘Corrugated steel web is folded along the longitudinal direction and has the mechanical properties such as axial compression stiffness corrugation effect, shear modulus corrugation effect, similar to that of an accordion. In order to study the lateral-torsional buckling of box beams with corrugated steel webs (BBCSW) under the action of bending moment load, the neutral equilibrium equation of BBCSW under the action of bending moment load is derived through the stationary value theory of total potential energy and further, along with taking Kollbrunner-Hajdin correction method and the mechanical properties of the corrugated web into consideration. The analytical calculation formula of lateral-torsional buckling critical bending moment of BBCSW is then obtained. The lateral-torsional buckling critical bending moment of 96 BBCSW test specimens with different geometry dimensions are then calculated using both the analytical calculation method and ANSYS finite element method. The results show that the analytical calculation results agree well with the numerical calculation results using ANSYS, thus proving the accuracy of the analytical calculation method and model simplification hypothesis proposed in this paper. Also, compared with the box beams with flat steel webs (BBFSW) with the same geometry dimensions as BBCSW, within the common range of web space-depth ratio and web span-depth ratio, BBCSW’s lateral-torsional buckling critical bending moment is larger than that of BBFSW. Moreover, the advantages of BBCSW’s stability are even more significant with the increase of web space-depth ratio and web depth-thickness ratio.
文摘By analyzing several effective finger practices, it is possible to consolidate the basic skills to help students adjust and establish a good touch mode. This is an important pre-requisite for pursuing strength and speed during playing. The training method can be targeted to solve some common problems, and guide students to consciously feel the touch and the change of tone, listening with ears, controlling with fingers to achieve solid and soft balanced unity.
文摘In early childhood education it is important to determine a child＇s ability or attitude towards different subjects Training and/or education geared towards these tendencies will not only ensure a more healthy future choice in education for the child but furthermore will enable the child to have a happier educational atmosphere in early childhood. Music education/training in early childhood is considered to be very important in early years. Music education/training, in the correct and proper context using tangible and feasible teaching techniques not only improves and develops a child＇s musical skills but also helps develop his/her personality. Two people who shared this view were Zolt^n Kod^ly and Shinichi Suzuki. Suzuki positively affected the educational systems worldwide with his approach to violin teaching and his ideas on early childhood pedagogy. Choosing between the Suzuki violin teaching methodology and the traditional violin teaching methodology is a personal decision. This article tries to objectively elaborate on different aspects of Suzuki and traditional violin teaching methodologies. Each methodology has its pros and cons and knowing what these are will help individuals to make a more educated choice.
