4,444 research outputs found
Wave function Monte Carlo method for polariton condensates
We present a quantum jump approach to describe coupled quantum and classical
systems in the context of Bose-Einstein condensation in the solid state. In our
formalism, the excitonic gain medium is described by classical rate equations,
while the polariton modes are described fully quantum mechanically. We show the
equivalence of our method with a master equation approach. As an application,
we compute the linewidth of a single mode polariton condensate. Both the line
broadening due to the interactions between polaritons and the interactions with
the reservoir excitons is taken into account.Comment: 6 pages, 2 figure
Laser application to measure vertical sea temperature and turbidity, design phase
An experiment to test a new method was designed, using backscattered radiation from a laser beam to measure oceanographic parameters in a fraction of a second. Tyndall, Rayleigh, Brillouin, and Raman scattering all are utilized to evaluate the parameters. A beam from a continuous argon ion laser is used together with an interferometer and interference filters to gather the information. The results are checked by direct measurements. Future shipboard and airborne experiments are described
Developing reference material for validation of hair spectral analysis reliability
Mineral analysis of human hair is increasingly proposed as a estimation method for the human contamination with environmental mineral pollutants and even as a diagnostic tool for related health problems. It offers a good way of investigating long-term variation in trace element concentration. Many minor and trace elements can be determined in hair samples with good precision and sensitivity by a variety of analytical techniques. An important requirement in such work is the application of suitable analytical quality control, for which the availability of a hair reference material is important. In paper the preparation of the human hair reference material and the initial stages which were taken to confirm its certification are described
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