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This work explored two modification methods to improve biochar's ability to sorb arsenic (As) and lead (Pb). In one, pine wood feedstock was pyrolyzed in the presence of MnCl2·4H2O (MPB) and in the other it was impregnated with birnessite via precipitation following pyrolysis (BPB). The resulting biochars were characterized using thermogravimetry, X-ray(More)
—In Cognitive OFDM, out-of-band (OOB) leakage of OFDM signal should be suppressed in order to avoid interference to primary signals. Active interference cancellation (AIC) is a novel OOB leakage suppressing technique. In this paper, AIC method for multiple narrow-band primary signals (NPSs) in cognitive OFDM is discussed. We propose a sub-optimal method of(More)
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