effective attenuation
1.Effective attenuation ranges from 15 to 75 dB/m at Site H3 and from 22 to 62 dB/m at Site H4. Parameters determined by core analysis were fixed in Biot-Stoll models and inversion of velocity and attenuation data was used to evaluate the 6 unmeasurable parameters.
2.It is also shown that there is a minimum shothole depth for given conditions including thickness and lithology of shot layer, low end frequency of effective signal, and wave attenuation steepness in time domain.
3.To compound BN and SiO_2 candecrease its T_F, increase its T_G, improve its high temperature dielectriccharacteristics, and therefore is an effective approach to reduce the reentrysignal attenuation of BN antenna window.
4.The application of multi-level delay charging method has change the conventional charging method and increase the effective energy in downgoing elastic wave, which has unique effect in increasing the bandwidth of effective wave, resolution, S/N ration and interference attenuation and is worth to propagate.
5.By the 1:1 beam test, some characteristics of TOF model were test, including time resolution, attenuation length and the effective speed of light, which gave the reference to the selection of reflective material of BESIII TOF.
