Piezoelectric suppression for rapid detection of Methamphetamine Hydrochloride via N nuclear quadrupole resonance.

The ability to rapidly detect the presence of narcotic substances in baggage and on personnel is a prime requirement in airports, mail distribution centres and mass screening portals. Nuclear Quadrupole Resonance (NQR) is well-suited to detect selected narcotics as the resonances can be highly discriminating of a given substance due to the presence of narrow, non-overlapping spectral lines. Furthermore, the transparency of non-conductive materials to radio frequency (RF) magnetic fields allows for NQR to measure bulk volumes without any sample preparation.

Quantitative measurements of loss on ignition in iron ore using laser-induced breakdown spectroscopy and partial least squares regression analysis.

Laser-induced breakdown spectroscopy (LIBS) and partial least squares regression (PLSR) have been applied to perform quantitative measurements of a multiple-species parameter known as loss on ignition (LOI), in a combined set of run-of-mine (ROM) iron ore samples originating from five different iron ore deposits. Global calibration models based on 65 samples and their duplicates from all the deposits with LOI ranging from 0.5 to 10 wt% are shown to be successful for prediction of LOI content in pressed pellets as well as bulk ore samples.