The results show that the sonic wave speed of spillway foundation rock exceeding 5 km/s(Kv>0.67) occupies 89%, and the one exceeding 4 km/s(Kv>0.53) occupies 89%. The results match with the excellent and good class rock Es ratio of design and adoptive rock quality.
The results indicated that the average degradation of xylene could come up to 99.2% under the following reaction conditions: 27.6 mg/L of xylene concentration,1.68 g/L H_2O_2 concentration,(241) of temperature,141.32 W/cm~2 of sonic intensity and 1 h of irradiation.
The results show that the average of degradation of xylene could come up to 99.2% under the following reaction conditions: 27.6 mg/L of xylene concentration, 1.68 mg/mL H_2O_2 concentration, 24±1 ℃ of temperature, 141.32 W/cm~2 of sonic intensity and 1 h of irradiation.
The results show that the mechanical and dynamic mechanical properties,structure parameters and thermal properties of different fiber number PET POY are not alike,there is much difference between the sonic orientation factor,birfringence,[E]_(max),[E]_(min). tgα_(max),,E″1_(max),E″2_(max) etc values, and the changing limit of Various parameters are scheduled.
Good linear correlations were obtained except in the case of TBP concentration. The "sonic speed" coefficients of temperature, thorium and nitric acid concentrations are-3.6 m sec-1/℃, -0.73·m·sec-1g l-1 and - 11.8·m·sec-1/N respectively.
Adopting nonlinear BP neural network method technology and utilizing kinematics and dynamics characteristrc parameters of sonic wave,the authors make multi-parameters synthetic detection to the bridge concrete member defects under the restraint of the parameter of the known sample. This is feasible as regards method technology.
Propagation of sonic wave and results of ultrasonic imaging logging are affected, in some degree, by these factors, such as working frequency, types of transducers, measuring distances, scanning intervals, tool eccentricity and slope, interface wave impedance difference, etc.
Starting from the basic regularity of sonic propagation in the holes, the paper discovered that when the source interval is about 1m,the sonic wave propagating with P-wave velocity of formation has some dispersion character after multiple reflection of sonic wave in the hole because of the wavelength of sonic wave in cylindrical hole approaching to the diameter of the hole,which leads to unfixed phases of head wave of sonic wave that change with source intervals.
For the system of equations of motion of the mixed elliptic-hyperbolic type in the potential plane, a particular solution is found which corresponds to gas motion in a nozzle with a curved sonic line.
The stream function far from a profile in a two-dimensional sonic free gas jet is constructed.
With unlimited increase of the jet width and by satisfying a certain condition, the stream function transforms to the self-similar solution of Frank [1, 2] and Guderley, which describes an unbounded sonic stream far from the profile.
In conclusion, flow of a sonic jet issuing from a duct about a profile is considered.
Plane vortex flow in the vicinity of the point of orthogonality of the sonic line to the velocity vector