The index of casualties is introduced for the trapped that is still alive after a destructive earthquake to indicate his (her) injury degree. In order to describe the injury-developing process controlled by three fact...The index of casualties is introduced for the trapped that is still alive after a destructive earthquake to indicate his (her) injury degree. In order to describe the injury-developing process controlled by three factors: the initial injury degree, the trap surroundings and the physique of the cornered, a function SFC (State-Function of Casualties) can be naturally constructed. Through parameter analysis from eight pieces of figures, it can be found that the trapped with weaker physique and worse initial injury degree and in more adverse trap surroundings deserves sooner rescue.展开更多
A compression wave discharged from an open end of a tube causes positive impulsive noise. Active noise cancellation which is the canceling of the noise by the addition of an inverse wave is a useful technique for redu...A compression wave discharged from an open end of a tube causes positive impulsive noise. Active noise cancellation which is the canceling of the noise by the addition of an inverse wave is a useful technique for reducing impulsive noise. The main objective of this study is to present the design for a negative impulsive wave generator utilizing unsteady mass influx. In this paper, in order to clarify the relationship between the unsteady mass influx and the negative impulsive wave! numerical and aeroacoustic analyses have been carried out using an unsteady expansion wave discharged from an open end of a shock tube. As a result, the effect of an unsteady expansion wave on a negative impulsive wave was clarified.展开更多
文摘The index of casualties is introduced for the trapped that is still alive after a destructive earthquake to indicate his (her) injury degree. In order to describe the injury-developing process controlled by three factors: the initial injury degree, the trap surroundings and the physique of the cornered, a function SFC (State-Function of Casualties) can be naturally constructed. Through parameter analysis from eight pieces of figures, it can be found that the trapped with weaker physique and worse initial injury degree and in more adverse trap surroundings deserves sooner rescue.
文摘A compression wave discharged from an open end of a tube causes positive impulsive noise. Active noise cancellation which is the canceling of the noise by the addition of an inverse wave is a useful technique for reducing impulsive noise. The main objective of this study is to present the design for a negative impulsive wave generator utilizing unsteady mass influx. In this paper, in order to clarify the relationship between the unsteady mass influx and the negative impulsive wave! numerical and aeroacoustic analyses have been carried out using an unsteady expansion wave discharged from an open end of a shock tube. As a result, the effect of an unsteady expansion wave on a negative impulsive wave was clarified.
