There are three obvious diachronic levels in the pronunciations of the ancient voiced initial consonants in Min dialects nowadays: the unvoiced aspirated level, the unvoiced unaspirated level and the voiced level.

Having the phonetic experience of aspiration in the allophones of voiceless stops in their native language, the learners could identify the aspirated SC stops very well, but their identification on unaspirated stops is poor.

Comparative experiments were carried out to study the effect of the adsorption heat on the charge and discharge performances of a hydrogen storage system.

Study on the Aeration Performance of LHJ Flotation Column;

The circular centrifugal flotation cell has many originalities on the pulp aeration, air bubble mineralization, air pulp flow format in the ring shaped tank of the cell, feed method ect, due to the results of fluidics and turbulence and the action of centrifugal and gravitational force ect.

The“dead zone”of particle located at the bottom of annulus can be eliminated,and the effectiveness of solidgas contact,mass and heat transfer can be improved by introducing an auxiliary(aeration or fluidization)fluid into the annular region through a distributor.