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A terahertz (THz) digital holography system is built using a Gunn oscillator worked at 0.17 THz as the source and a Pyroelectric array camera as the detector array. Image was reconstructed in frequency domain of the hologram by using rectangular windowed filter and angular spectrum theorem was used to restore the complex amplitude of object wave.
Samples of moss (Haplocladium microphyllum) were collected at different elevations on a mountain and four representative sites in Guiyang City, and the concentrations of metal(loid)s were determined by ICP-MS. The altitudinal deposition of soil-originated metals differed from that of anthropogenic metal(loid)s. The concentrations of soil-related elements decreased with elevation, indicating that these...
To investigate the optimum parameters and mechanical properties of nickel-chromium alloy welded by laser, different laser irradiation power was used to weld dental nickel-chromium alloy by Nd: YAG apparatus. Mechanical properties, metallographic evaluation and scanning electron microscopy (SEM) analysis were used to evaluate joined samples. The mechanical properties, including tensile strength, percentage...
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