negative acceleration
1.When a swimmer slows and then finally applies forces there are stages of slowing down (the correct term is negative acceleration not deceleration) and speeding up (the correct term is positive acceleration not acceleration).
2.Variation of NO,NOS level of brain tissue and plasma ET in rats induced by positive and negative acceleration
3.This sequential action requires reciprocal even movements with the change of direction at each extreme of movement range requiring negative acceleration, stopping, and acceleration in the body roll.
4.Objective:To study the effects of naloxone on the tail pain threshold and the content of enkephalin and dynophin in brain tissue in rats after alternating action of positive acceleration(+Gz)and negative acceleration(-Gz).
5.If an arm is stretched forward under water resistance is increased and a reaction force backward is developed, both of which would contribute to negative acceleration.
6.Based on tabu search algorithms and Matlab, optimization simulation has been done. Compared with original design, the simulation results showed that plentiful coefficient increased by 1 24%, dynamical maximum positive acceleration lowered by 0 87% in ascending and increased by 5 23% in descending, the maximum negative acceleration decreased by 5 93%. The change of acceleration became more stable and the optimization effect was better than that of genetic algorithms.
7.Extreme negative and positive acceleration phases are not a characteristic of swimmers who must be efficient (e.g., 200 m plus) who usually demonstrate high rates, almost continuous propulsive force production, and minimum periods of time in long "sculling boat" positions.
8.According to an analysis of the aeromagnetic regional field in combination with man-made earthquake, Moho depth calculated by gravity, hydrothermal activity, recent volcanic activity, morphologic characteristics and natural seismic activity, it is held that the upward migration of deep heat flow in NNE direction caused local melting of magma and hence the rising of geotemperature in the lower part of the upper crust, which led to the demagnetization at the bottom of the magnetic bed, the appearance of negative magnetic anomalies, and the acceleration of the uplifting of Qinghai-Tibet plateau.
10.In this thesis the longitudinal force of a moving car is analyzed and a single wheel dynamics model in condition of braking is also developed. According to the shape of thewheel slip (λ) - adhesion coefficient (μ) curve, a method is developed to count thepositive or negative of dμ/dλ by brake moment, velocity and acceleration. Then the wheel slip and the adhesion coefficient between road and wheel can be judged according to dμ/dλ.
