We describe spectroscopy measurements of double wall carbon nanotubes using a displacement photocurrent technique. Peaks in the photocurrent are observed at excitation energies corresponding to the spacing of van Hove singularities for both the inner and outer shells of the nanotube. The shell assignment for the peaks can be made by comparing the spectra before and after the formation of the in...

A novel interferometric scheme for detection of ultrasound is presented. The proposed technique is based on the classical Michelson architecture, which is known for its high sensitivity on mirror like surfaces. In order to adapt this inteferometer for industrial applications, quadrature demodulation is implemented. The use of quadrature demodulation eliminates the requirement of path stabilizat...

Dentin hypersensitivity (DH) is viewed by individuals as an important health problem and it is reported by the patient as a sharp pain caused by different external stimuli in dentin exposure. Objective: To describe the best approaches for DH treatment, mainly in cases with no clinically significant loss of tooth structure. Review: Several different approaches (in office and at home) have been p...