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Muck problems in subway shield tunneling in sandy cobble stratum

100%

Cui K. , Lin W.

tom 23

nr Special Issue S1

Experiments aiming at the muck improvement for Chengdu’s subway shield tunneling in water-rich sandy cobble ground initially finds out the kinds and ratio of muck improver suitable for the this strata, and through the field application determines the reasonable ratio of muck improver for shield tunneling in sandy cobble ground, providing a reference to other muck improvement for shied tunneling in similar ground. And the earth pressure balanced shield is widely used in tunnel engineering, with its characteristics as wide adaptability, safe operation, fast driving speed, low environmental noise and low cost. Taking Chengdu Metro Line as the background, aiming at the difficulty faced by EPB shield tunneling in water-rich sandy cobble ground, and based on the explorations and researches of the predecessors and scholars, engineering and technical personnel, the present paper combines with engineering examples to make a systematic summary and research on key construction technology of EPB shield tunneling through sandy cobble ground from the aspects of EPB shield adaptability, , structure and transformation of cutter and helical unearthed wares, settlement control method, and muck improvement measures. It has certain reference value and guiding significance to the selection of shield machine and the reconstruction of shield machine in complex geological condition

Effects of dietary supplementation with Bacillus subtilis and yeast culture on growth performance, nutrient digestibility, serum indices and faeces microbiota of weaned piglets

80%

Cui K. , Iv X. , Diao Q. , Zhang N.

Journal of Animal and Feed Sciences

2019

tom 28

nr 4

Drought stress condition increases root to shoot ratio via alteration of carbohydrate partitioning and enzymatic activity in rice seedlings

61%

Xu W. , Cui K. , Xu A. , Nie L. , Huang J. , Peng S.

tom 37

nr 02

To understand the underlying mechanism for plasticity in root to shoot ratio (R/S) in response to drought stress, two rice cultivars, Zhenshan97 (drought susceptible) and IRAT109 (drought resistant), were grown hydroponically, and R/S, carbohydrate concentration and partitioning, and activities of enzymes for sucrose conversion in seedlings exposed to drought stress condition (DS) imposed by polyethylene glycol 6000 were investigated. The R/S significantly increased under DS in comparison with that under well-watered condition. The proportion of dry matter and soluble sugar of roots markedly increased under DS. The R/S was negatively correlated with proportion of soluble sugar in stems, and positively with the proportions of soluble sugar and starch in roots. Drought stress condition significantly increased leaf sucrose-phosphate synthase (EC 2.4.1.14) activity and root acid and neutral/ alkaline invertase (EC 3.2.1.26) activity. The R/S was positively correlated with leaf sucrose-phosphate synthase and root acid invertase activity, and negatively with leaf sucrose synthase activity in the cleavage direction. Our results indicate that the increase in R/S in response to DS is closely associated with the higher proportion of dry matter and soluble sugar in roots, and this occurs via an increase in leaf sucrose-phosphate synthase and root invertase activity, and thus more sucrose is available for transport from leaves to roots.

Gibberellic acid is selectively downregulated in response to aphid-induced gall formation

51%

Wang H. , Liu J. , Cui K. , Chen H. , Yang Z. , Wu H. , Shao S. , King-Jones K. , Chen X.

Acta Physiologiae Plantarum

2016

tom 38

nr 09

The impacts of crustacean zooplankton on a natural ciliate community: a short-term incubation experiment

51%

Li J. , Yang K. , Chen F. , Lu W. , Fang T. , Zhao X. , Li H. , Cui K.

nr 4

Histone hyperacetylation may improve the preimplantation development and epigenetic status of cloned embryos

51%

Sun J. , Cui K. , Li Z. , Gao B. , Jiang J. , Liu Q. , Huang B. , Shi D.

nr 2