The dynamic susceptibility of propylene carbonate in the moderately viscous regime above Tc is reinvestigated by incoherent neutron and depolarised light scattering, and compared to dielectric loss and solvation response. Depending on the strength of α relaxation, a more or less extended β scaling regime is found. Mode-coupling fits yield consistently λ = 0.72 and Tc = 182 K, although different positions of the susceptibility minimum indicate that not all observables have reached the universal asymptotics.
The nondestructive testing (NDT) techniques active thermography and terahertz time domain spectroscopy (THz-TDS) are both newcomers to the large range of established NDT methods: Both are contactless imaging techniques and well suited for analysing layered materials e.g. ceramic coatings, polymer laminates and glued materials. These two methods are compared for characterising ceramic coatings. Measurement results show these two methods are practicable and complimentary for NDT applications of layered structures. The pulse-thermography is suitable for fast screening inspection and THz-TDS imaging performs well for the detailed investigation of coatings and boundary variations.
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