Optimization of cavity size for spatial confined laser-induced breakdown spectroscopy.

Spatial confinement with a small cavity is known to enhance the signal intensity of laser-induced breakdown spectroscopy. In this study, the optical emission intensity and signal stability in terms of the relative standard deviation of laser-induced plasmas generated from brass samples with and without the presence of small cylindrical cavities were carefully investigated. The cylindrical cavities were prefabricated by drilling on a set of aluminum plates with variable diameters and heights, which were then placed near the sample surface.

[Determination of trace Cu in water by laser-induced breakdown spectroscopy].

In the present article, the ordinary printing paper was immerged in the aqueous solution of CuCl2, and used as an absorber for the enrichment of heavy metal copper in liquid. After being taken from the solution and dried, the paper was then analyzed using laser-induced breakdown spectroscopy. This method overcomes the drawbacks of splashing and low sensitivity in the process of direct analysis of heavy metal in water sample with LIBS.

[Laser ablation and fast pulse discharge plasma spectroscopy analysis of Sn in soil].

A developing technique, laser ablation and fast pulse discharge plasma spectroscopy technique (LA-FPDPS), was used for the first time to analyze the Sn concentration in soil. The peak intensity of Sn (284.0 nm) line from soil plasma emission was greatly enhanced in comparison with using the traditional single pulse (SP) LIBS system.

Development of a nanosecond discharge-enhanced laser plasma spectroscopy.

A nanosecond pulse discharge circuit is developed and used to enhance the optical emission of laser plasma. An intense discharge spark was observed with a peak discharge current of 1.9 kA and a peak power of 6.

Optimizing the design of nanostructures for improved thermal conduction within confined spaces.

Maintaining constant temperature is of particular importance to the normal operation of electronic devices. Aiming at the question, this paper proposes an optimum design of nanostructures made of high thermal conductive nanomaterials to provide outstanding heat dissipation from the confined interior (possibly nanosized) to the micro-spaces of electronic devices. The design incorporates a carbon nanocone for conducting heat from the interior to the exterior of a miniature electronic device, with the optimum diameter, D0, of the nanocone satisfying the relationship: D02(x) ∝ x1/2 where x is the position along the length direction of the carbon nanocone.