No abstract

In our previous work, a novel slurry approach that suspends zeolitic imidazolate framework-8 (ZIF-8) in solvents (glycol and glycol-2-methylimidazole) for CO 2 capture was reported. This approach can efficiently remove CO 2 from gas mixtures at normal pressure/temperature. In this work, a system with water coexistence was investigated for real CO 2 capture application purposes. Our results show that the structure of the recovered ZIF-8 collapses in the presence of water during the CO 2 capture process; however, ZIF-8 can keep its full crystallinity and gas adsorption/separation properties with 5 wt % mIm or more in liquid. Selectivity of CO 2 /CH 4 reaches 76, and its value increases to 190 when 40 wt % mIm was added after four cycling times. Adding suitable mIm can protect the ZIF-8 structure in the environment containing CO 2 and water.

No abstract

UM2000 signal is a type of multi-audio frequency-modulated signal which is widely used for railway blocking. Principles of three typical demodulating algorithms are presented in details in this paper. Bit error rates of the three methods at different SNRs are achieved by Monte Carlo simulation experiments. Among the three algorithms, the quadrature demodulation has the best performance at the real working environment. However, the three methods have the same problem of phase hopping when noise is too strong.