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The existing study focused more on one-dimensional nanostructures such as nanotubes and nanofibers for various potential applications, but less on evaluation of their mechanical properties. Therefore, this study mainly concentrates on near-field electrospinning (NFES) and hollow cylindrical near-field electrospining (HCNFES) process to fabricate permanent piezoelectricity of polyvinylidene fluoride...
In this study, near-field electrospinning (NFES) was used to fabricate PVDF (Polyvinylidene fluoride) piezoelectric nano-fibers mixed with additional multiwalled-carbon nanotubes (MWCNT). Both mechanical strength and piezoelectric characteristics of a single nano-fiber were discussed. NFES technology can be used to fabricate PVDF piezoelectric fibers with an excellent piezoelectric property. By adjusting...
In this paper, we present the analytical modeling on the temperature dependent microwave noise in AlGaN/GaN HEMTs on Si substrate over a wide temperature range from -50 to 200??C. The noise source coefficients and small signal equivalent circuit parameters (ECPs) were extracted and their variations over temperature were fitted using a simple quadratic relationship. An analytical model for the overall...
In this paper, we present the temperature dependent microwave noise measurements and modeling of AlGaN/GaN HEMTs on Si substrate over a wide temperature range from -50 to 200degC. The typical noise parameters including minimum noise figure (NFmin), noise equivalent resistance (Rn), optimum source reflection coefficient (Gammaopt) and associate gain (Ga) at different temperatures were measured and...
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