CIRC is short for Cooperative Integrated Reading and Composition.It is to help improve students' English proficiency by integrating writing into reading.In order to verify the results of the method,the author made...CIRC is short for Cooperative Integrated Reading and Composition.It is to help improve students' English proficiency by integrating writing into reading.In order to verify the results of the method,the author made an experimental study in Nanning College for Vocational Technology.She designed a small teaching cycle of "7 phases with 12 steps"and applied CIRC in her English class.One of the results is that CIRC can improve students'academic achievements.展开更多
The acoustic signal from an impulsive source near an ideal rigid wedge consists of the reflected waves from the inclined plane and the diffracted waves from the apex of the wedge. There are two theoretical solutions o...The acoustic signal from an impulsive source near an ideal rigid wedge consists of the reflected waves from the inclined plane and the diffracted waves from the apex of the wedge. There are two theoretical solutions of the problem. The first was obtained by Biot-Tolstoy using normal coordinates. The second was Trorey's Helmholtz-Kirchhoff solution. So far the experimental measurements have concentrated on the diffracted wave from the wedge apex and ignored the rest of the solution. The Biot-Tolstoy exact wedge solution is used in this paper to study the sound transmission in wedges of angle 12 °and 52 °approximately. The theory and the experiments are consistent. Also studied is the behaviour of the reflected and diffracted waves from a 270 °wedge. Both theories predicted the existence a specular ' image ' reflection when a coincident source and receiver are over a half plane. The experimental results showed that the Biot-Tolstoy theory was accurate and the Trorey solution produced quite large errors.展开更多
文摘CIRC is short for Cooperative Integrated Reading and Composition.It is to help improve students' English proficiency by integrating writing into reading.In order to verify the results of the method,the author made an experimental study in Nanning College for Vocational Technology.She designed a small teaching cycle of "7 phases with 12 steps"and applied CIRC in her English class.One of the results is that CIRC can improve students'academic achievements.
文摘The acoustic signal from an impulsive source near an ideal rigid wedge consists of the reflected waves from the inclined plane and the diffracted waves from the apex of the wedge. There are two theoretical solutions of the problem. The first was obtained by Biot-Tolstoy using normal coordinates. The second was Trorey's Helmholtz-Kirchhoff solution. So far the experimental measurements have concentrated on the diffracted wave from the wedge apex and ignored the rest of the solution. The Biot-Tolstoy exact wedge solution is used in this paper to study the sound transmission in wedges of angle 12 °and 52 °approximately. The theory and the experiments are consistent. Also studied is the behaviour of the reflected and diffracted waves from a 270 °wedge. Both theories predicted the existence a specular ' image ' reflection when a coincident source and receiver are over a half plane. The experimental results showed that the Biot-Tolstoy theory was accurate and the Trorey solution produced quite large errors.
