Sulfated cyclofructan 6 (S-CF6) and sulfated cyclodextrins (S-α-, β-, γ-CDs) are highly selective chiral selectors for the enantioseparation of basic solutes. In this study, S-CF6 was introduced for the enantiomeric separation of four basic pharmaceuticals (including tamsulosin, tiropramide, bupivacaine, and norephedrine) by capillary electrophoresis (CE), and the enantiomeric separation performance was compared with S-α-, β-, γ-CDs. The effects of the chiral selector type, chiral selector concentration, operating voltage, and column temperature were examined and optimized. Excellent resolutions were obtained for all solutes on these chiral selectors.

Abstract. Aiming at the problem of spectrum sensing in cognitive radio under low signal to noise ratio (SNR) and channel fading, proposed a spectrum sensing method based on Stochastic Resonance (SR) and multi-antenna. The received signal of each antenna will pass through SR, to enhance the source signal using noise energy. Then the output of multi-antenna will be combined by Equal Gain Combining (EGC), and Differential Energy Detection (DED_SR) and Periodogram Energy Detection (PED_SR) will be adopted. Simulation experiments compare the traditional Energy Detection (ED), DED_SR and PED_SR. The results show that the detection probability of PED_SR and DED_SR perform higher than ED, but the sensing time also perform higher.