High quality lead molybdate(PbMoO4)crystals were used as the acousto-optic medium whose acoustical excitation center frequency is 100MHz, with the diffraction efficiency greater than 80%, pulse rise time less than 140ns, static extinction ratio over 1000:1, and the transimitivity above 90%.
In the device, Ti-diffused YX-lithium niobate substrate was applied as optical waveguide, a SiO_2/In_2O_3 film of thickness ～150 nm as SAW waveguide and an acoustical aperture of width 110 μm, in conjunction with N=9 finger pairs.
Based on the calculated vehicle speed and the statistics data of each kind of vehicle type proportion, we obtains each grid acoustical power level, consequently obtain Leq, L10, L50 and L90 spurt value corresponding to grid points, Thus we solved from the problem of traffic flow model to noise calculation, and realized the dynamic traffic simulation.
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.
This algorithm is provided with a sound theoretic basis, and its computing complexity is relatively lower and not strongly dependent on the data length.
Relationships between longitudinal and radial Picea genera sound vibration parameters
Longitudinal sawn wood are usually selected as samples in the study of sound properties of a musical instrument board.
Therefore, it is very important to evaluate the vibration properties of the board in the round, especially for the sound radiation characteristic of radial sawn timber and its relationship to longitudinal sawn timber.
However, for the national and international experts, researches on radial sawn timber and its role and function in sound emission have not yet been developed.
Masking effect of different durations of forward masker sound on acoustical responses of mouse inferior collicular neurons to pr
Pressure of an arbitrary acoustical wave on a plane
The results obtained can be used in the analysis of acoustical cavitation in aqueous solutions of polymers.
Nonlinear stabilization of unstable acoustical vibrations in a bounded heat-evolving medium
In this paper equations are derived for the fully established amplitudes of plane acoustical vibrations in a three-wave approximation, taking account of boundary impedances, breaking down the "internal" resonance of the acoustical overtones excited.
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