Research on SAFT Imaging Method of Array Probes in Concrete Structures

Abstract

Because of the need of rapid detection of internal defects and embedded object in concrete structures, a detecting method with linear array probes is presented here, which is the high-resolution and efficient imaging technique for concrete structures by combining with synthetic aperture focusing technique (SAFT). Firstly, array simulation data are processed to be amalgamated B-scan data of concrete structures according to the structural characteristics of linear array; And then the B-scan data are reconstructed in the light of geometrical relation of ultrasonic path and SAFT; At last, the structural imaging figure are calculated. It can be shown from simulation results that the method is effective, and the embedded object in model can be identified effectively.

Electrospun poly(acrylic acid)/poly(vinyl alcohol) nanofibrous adsorbents for Cu(ii) removal from industrial plating wastewater

“…The positive value of DH 0 (23.47 kJ mol À1 ) means that Cu(II) removal by the nano-brous adsorbents is an endothermic process. Similar results have been observed by previous researchers, observed the endothermic nature of Cu(II) removal by titanate nanobers, 55 aminated PAN nanobers, 21 poly(ethylene oxide)/chitosan nanobers, 28 and PVA/ZnO nanobers. 25 A positive value of DS 0 (56.44 J K À1 mol À1 ) insisted that the degree of randomness increased at the interface between the adsorbent and the adsorbate during Cu(II) removal.…”