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The suggested method is based on the exploitation of the ultrasonic shear waves reflection phenomenon from an interface which consists in an elastic reference medium and a viscoelastic material of interest. We applied this method to the geopolymer; this polymer-like material is inorganically synthesized by the alkaline activation of an aluminosilicate source (metakaolin) in an aqueous solution. This...
Recently a nonlinear ultrasound method called Dynamic Acoustoelastic Testing (DAET), previously developed to detect cracks in solids, has been adapted to assess the nonlinear viscoelastic properties of fluids.
Electrospun and fibers hydrogels are two focal points of research within the biomaterials community. The electrospinning process allows for fabrication of nanoscale, aligned topography and has been shown to direct cellular migration and outgrowth. Hydrogels exhibit benefits over traditional, rigid scaffolds in that they are injectable and can be tailored to mimic the mechanical properties of the surrounding...
We discuss the borehole deformation which is caused by the sensor and changes with time, and the ground stress formula calculated by the measured value is finally brought out, which is called stress measurement with rheological method. With the practical measurement, we use the nonlinear least squares method to get rock stress, and stress measurement with rheological method is similar to stress measurement...
Biocompatible polymeric hydrogels based on poly (vinyl acetate) (PVAc) and poly (methyl vinyl ether-co-maleic anhydride) (PMVE-MA) which demonstrated tunable adhesion to both hydrophobic and hydrophilic surfaces as ideal candidates for denture adhesives were prepared. PVAc was partially hydrolyzed in a mixed solvent of ethanol and water, and then mixed with PMVE-MA. Cross-linking between these two...
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