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1

Petrochemical wastewater gasification with Na2CO3 and K2CO3

100%
Fan Q.
Polish Journal of Environmental Studies
|
2015
|
tom 24
|
nr 3
Gasification of petrochemical wastewater for hydrogen production in supercritical water was studied in a fluidization bed system with the presence of Na₂CO₃ and K₂CO₃. The influences of the main parameters, including temperature, pressure, feedstock concentration, and catalyst addition, on the gasification process were discussed. Experiment results show that temperature is the key factor and pressure has a minor effect on petrochemical wastewater gasification. Higher temperature and pressure favors petrochemical wastewater gasification. Gasification performance of petrochemical wastewater decreases with increasing concentration. Gasification efficiency increases and molar fraction of CO decreases with Na₂CO₃ and K₂CO₃ addition. It is implied that the supercritical water fluidization bed system is effective for hydrogen production by biomass gasification.
2

Colonization with arbuscular mycorrhizal fungus affects growth, drought tolerance and expression of stress-responsive genes in Poncirus trifoliata

63%
Fan Q., Liu J. H.
Acta Physiologiae Plantarum
|
2011
|
tom 33
|
nr 4
The objective of this study was to investigate the effects of arbuscular mycorrhizal fungus (AMF) inoculation on growth and drought tolerance of Poncirus trifoliata seedlings. The seedlings were inoculated with or without Glomus mosseae before exposure to a short-term (3 days) water depletion, and relevant physiological and biochemical parameters (plant height, chlorophyll content, relative water content, activity of antioxidant enzymes) and expression patterns of several stress-responsive genes were examined. Inoculation with G. mosseae led to growth promotion of the seedlings, as revealed by larger plant height and higher relative water and chlorophyll contents. When subjected to drought treatment, the AMF-inoculated (AM) plants showed better tolerance than the nonmycorrhizal (NAM) plants. Under drought, the AM plants exhibited higher level of proline and activity of two antioxidant enzymes, superoxide dismutase (SOD) and peroxidase (POD). In addition, mRNA abundance of four genes involved in reactive oxygen species homeostasis and oxidative stress battling was higher in the AM plants when compared with the NAM plants. These results indicate that AMF inoculation stimulated growth and enhanced drought tolerance of the seedlings, which may be due to activation of an arsenal of physiological, biochemical and molecular alterations.
3

Effect of reinforcement ratio and vertical load level on lateral capacity of bridge pile foundations

63%
Fan Q., Gao Y.
Polish Maritime Research
|
2018
|
tom 25
|
nr Special Issue S3
The bearing response of pile foundations for cross-sea bridge subjected to lateral loading is investigated through three-dimensional finite element numerical analyses. In the analyses, non-linear behavior of concrete is simulated using smeared cracking model, and the strain-stress relationship of rebar is modeled through perfectly elasto-plastic model obeying Mises yield criterion. The finite element model is validated against published lateral static loading test in situ. The effect of reinforcement ratio of reinforced concrete and vertical load level is explored on the displacement of pile head and lateral capacity of pile. The results show that for the pile with low reinforcement ratio, the allowable lateral capacity is controlled by concrete cracking, however the allowable lateral capacity is controlled by the displacement of pile head with high reinforcement ratio. The vertical load applied on the pile head may reduce its displacement but increase simultaneously the maximum moment in the pile body. Therefore, the optimum vertical load level is 0.4~0.6 times of the vertical ultimate load of a single pile
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