Differential velocity detection in the fovea was measured over a wide range of velocities (0.25-256 degrees/sec). Differential thresholds were minimum (about 6%) for intermediate velocities (4-32 degrees/sec). Velocity judgements were shown not to depend on duration judgments. The U-shaped curve relating differential velocity detection and velocity was preserved at different background levels a...

OBJECTIVE To compare uterine artery Doppler velocity and impedance indices in the presence and absence of uterine artery waveform notches, in the prediction of adverse pregnancy outcome in high-risk women. METHODS One hundred and fifty-seven women identified at Doppler screening as being at 'high risk' underwent a further uterine artery Doppler assessment at 24 weeks' gestation. Pulsatility a...

1. In open loop, the velocity response depends on the mechanical time constant of the DC machine (time response) and the value of the power supply. Indeed, for each value of power supply, a velocity value is reached in steady state. Therefore the DC machine can reach any value of velocity which depends only of the power supply. In this case no possibility to improve performances. 2. For a speci...

Simple harmonic motion of two moving tines can induce a relative motion between two adjacent stationary lines. There is both a maximum and minimum stimulus amplitude within which this motion can be seen and this depends on frequency. For a wide range of low frequencies the lower amplitude limit for induced motion is inversely proportional to frequency, suggesting that the phenomenon requires a ...

Mobile sensors cover more area over a period of time than same number of stationary sensors. However, the quality of coverage achieved by mobile sensors depends on the velocity, mobility pattern, number of mobile sensors deployed and the dynamics of the phenomena being sensed. The gains attained by mobile sensors over static sensors and the optimal motion strategies for mobile sensors are not w...

Mobile sensors cover more area over a period of time than same number of stationary sensors. However, the quality of coverage achieved by mobile sensors depends on the velocity, mobility pattern, number of mobile sensors deployed and the dynamics of the phenomena being sensed. The gains attained by mobile sensors over static sensors and the optimal motion strategies for mobile sensors are not w...