Combining the technologies of the satellite formation flying with the satellite to satellite tracking (SST), the effect of satellite formation flying on autonomous navigation is analyzed in this paper. Considering the effect of satellite formation flying, the autonomous navigation system with relative inertial-position vector measurement is proposed firstly. Then, observability of the system wi...

Anecdotal reports of ultrasound use by flying squirrels have existed for decades, yet there has been little detailed analysis of their vocalizations. Here we demonstrate that two species of flying squirrel emit ultrasonic vocalizations. We recorded vocalizations from northern (Glaucomys sabrinus) and southern (G. volans) flying squirrels calling in both the laboratory and at a field site in cen...

Aim at the random problems of flying gangue movement in steeply dipping seam mining, based on the spherical flying gangue movement model, computational formula of collision restitution coefficient was established when flying gangue shocks bottom plate of working face according to the theory of Hertz classical elastic collision; Considering the influences of the randomness such as the density, r...

PURPOSE To determine the reliability of the 505 change-of-direction (COD) test performed with both a stationary and a flying start. METHODS Fifty-two female netball players (age 23.9 ± 5.4 y, height 169.9 ± 3.3 cm, body mass 65.2 ± 4.6 kg) performed 6 trials of the 505 COD test, 3 with a flying start and 3 with a stationary start, once per week over a 4-wk period to determine within- and betw...