| 摘要 |
<p>The method involves impressing on the system an initial acceleration of suitable magnitude and subjecting the system to an acceleration stage of suitable duration. The direction of the acceleration is inclined to the vertical at a suitable angle so as to make the system follow a ballistic trajectory in the said gravitational field. The ballistic trajectory follows the acceleration stage and comprises an ascending phase and a descending phase whose respective durations define the total duration of the ballistic stage, i.e. the stage during which the system describes the said ballistic trajectory. The ratio between the durations of the ballistic and acceleration stages being more or less equal to the ratio between the magnitude of the initial acceleration of the system and the magnitude of the acceleration due to gravity. …<??>The above sequence is repeated by again impressing on the system an initial acceleration at the end of each sequence, i.e. at the end of the descending phase. This repetition is carried out enough times to cover a predetermined period of time. …<IMAGE>… </p> |
