An experimental study on the travel time, magnitude and attenuation characteristics of elastic wave propagating along σ2(x direction)and σ3 (y direction) in marble specimen has been carried out using a true triaxial (σ1>σ2>σ3) compression apparatus.
The rule of equilibrium assignment which is based on travel time budget is determined, and then the multi-user equilibrium assignment model is established. To prove the equivalence with the actual condition, the existence and uniqueness of the solution, this paper utilizes mathematical optimization theory.
By analyzing the impact caused by commercial developments and travel time , this paper puts forward a method to identify the traffic impact area on commercial location and travel time by taking background traffic into consideratio n , which is very useful to instruct TIA in different cities theoretically and practically.
The adoption of PLL improves the clock phase precision leading to improving the measurement precision of the travel time. The system precision analysis showed that the flow measurement error is less than 0.25%.
The travel time of ultrasonic wave in NH 3 solutions at the temperature from 0 to 40 ℃ has been measured by the pulse-echo-overlap (PEO) method. The ultrasonic velocities and their first-order and second-order temperature-coefficients have been calculated.