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Your search keyword '"Zhu, Z.G."' showing total 144 results
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144 results on '"Zhu, Z.G."'

26. Considerations of phase transformations in the study of shear bands in a dynamically loaded steel block

Author

Zhu, Z.G. and Batra, R.C.

Subjects
Deformations (Mechanics) -- Research, Shear (Mechanics) -- Analysis, Science and technology
Abstract

The strain thermomechanical deformations of a dynamically loaded steel block are studied. A fixed set of rectangular Cartesian coordinates is used to express the block's important parameters, such as the stress tensor, mass density and specific energy. This equation is then solved by means of the Galerkin approximation technique. Results reveal that shear bands of intense plastic deformations occur at an angle of 45 degrees with the horizontal axis.

Published
1992

35. Effects of molecular weight on the liquid-liquid transition in polystyrene melts studied by low-frequency anelastic spectroscopy

Author

Wu, X.B., Shang, S.Y., Xu, Q.L., and Zhu, Z.G.

Subjects
Molecular dynamics -- Analysis, Polystyrene -- Atomic properties, Polystyrene -- Optical properties, Spectrum analysis -- Usage, Physics
Abstract

Low-frequency anelastic spectroscopy is used for examining the liquid-liquid transition ([T.sub.ll]) of polystyrene (PS) melts with different molecular weights in order to detect the effect of molecular weights on the dynamics of PS melt near and above [T.sub.ll]. The studies have shown that with increasing molecular weights, the PS melt has displayed a higher energy barrier, a smaller concentration of mobile species and a stronger coupling between mobile species at [T.sub.ll].

Published
2008

39. Early Methanogenic Colonisation in the Faeces of Meishan and Yorkshire Piglets as Determined by Pyrosequencing Analysis

Author

Su, Y., Bian, G.R., Zhu, Z.G., Smidt, H., Zhu, W.Y., Su, Y., Bian, G.R., Zhu, Z.G., Smidt, H., and Zhu, W.Y.

Abstract

Gut methanogenic archaea of monogastric animals are considered to be related to energy metabolism and adipose deposition of the host; however, information on their development in young piglets is limited. Thus, to investigate early methanogenic colonisation in the faeces of Meishan and Yorkshire piglets, faecal samples were collected from piglets at 1, 3, 7, and 14 days after birth and used to analyse the methanogenic community with 16S rRNA gene pyrosequencing. Results showed that the diversity of the methanogenic community in the faeces of neonatal piglets decreased from one to 14 days of age, as the total methanogen populations increased. The age of piglets, but not the breed, significantly affected the diversity of the methanogenic community which was dominated by the genus Methanobrevibacter. From the ages of one to 14 days, the abundance of M. smithii-related operational taxonomic units (OTUs) increased significantly, while the abundances of M. thaueri- and M. millerae-related OTUs decreased significantly. The substitution of M. smithii for M. thaueri/M. millerae was faster in Yorkshire piglets than in Meishan piglets. These results suggest that the early establishment of microbiota in neonatal piglets is accompanied by dramatic changes in the methanogenic community, and that the changes vary among pigs of different genotypes.

Published
2014

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