Pingan Liu

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We have fabricated a very narrow bandpass tunable terahertz (THz) filter based on a one-dimensional photonic crystal cavity. Since the filter consists of silicon wafers and air spacers, it has a very high quality factor of about 1500. The full width at half maximum (FWHM) of the passband is only about 200 MHz, and the peak transmission is higher than -4 dB.(More)
A novel template-free sonochemical synthesis technique was used to prepare NiO microspheres combined with calcination of NiO2.45C0.74N0.25H2.90 precursor at 500 °C. The NiO microspheres samples were systematically investigated by the thermograviometric/differential scanning calorimetry (TG/DSC), X-ray diffraction (XRD), field emission scanning electron(More)
The purpose of this paper was to investigate the reason why the interface delaminations occurred in the QFP structure. The stress concentration was the key factor responsible for the microcrack occurrence. In order to figure out which factors affect the stress distribution, the material’s attributes and the structure’s dimension were considered. The finite(More)
In order to investigate the flow field and heat transfer in a channel with one square rib on upper wall and two on lower wall, standard k ε − turbulence model and enhanced wall function was employed. The influence of the conductivity ratio s f k k (solid/fluid) on the heat transfer around the rib surface was explored. The results show that the maximum local(More)
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