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γ-Al2O3 with 3/4 sphere and cabbage-like structures were prepared via hydrothermal synthesis. Then they were evaluated as catalysts for the dismutation of HCFC-22 as a model reaction for Cl/F exchange reactions and compared with a commercial γ-Al2O3. The results indicate that both hydrothermal samples are formed by the loose assembly of nano-sheets. For cabbage-like alumina, hollow structure is detected...
The channel of troposcatter communications is characterized by multi-path and time-variant. Big Doppler Shift arises from aircraft navigating scatters. In order to estimate frequency offset quickly, a low complexity frequency offset estimation method is given in summary on the basis of the previous study. Comparing with previous methods, this method substitutes addition and subtraction for complex...
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