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Articles by Xiaojun Chen
Total Records ( 2 ) for Xiaojun Chen
  Guangwei Kuang , Andong Xiao , Qiyou Chen , Xiaojun Chen , Dasheng Zhang , Hui Wang and Zhiliang Sun
  A Gram-negative, rod-shaped bacterial strain named PB-CS01 which is bioluminescence-positive was isolated from contaminated commercial pork that probably had been exposed to seafood. Optimal growth of strain PB-CS01 requires the presence of 3.0% (w/v) NaCl and a temperature of 20°C. Phylogenetic analysis based on 16S rRNA gene sequences of strain PB-CS01 and other Photobacterium species showed that the novel isolate belongs to the genus Photobacterium. Sequence similarity analysis between PB-CS01 and other species indicates that the closest relatives of strain PB-CS01 are Photobacterium phosphoreum ATCC 11040 (99.9%), Photobacterium kishitanii pjapo.1.1 (99.8%) and Photobacterium iliopiscarium ATCC 51760 (99.5%). The most abundant fatty acids were summed feature 3 (50.77%; C16:1ω7c and/or C16:1ω6c) and C16:0 (15%). The fatty acid profile is similar to that of the genus Photobacterium but this report is the first to describe C16:1ω6c as one of the compositions of summed feature 3 of the genus Photobacterium. The G+C content of the genomic DNA of strain PB-CS01 was 44.8 mol%. Overall, strain PB-CS01 is a novel Photobacterium species.
  Sayed Mahmoud , Xiaojun Chen and Robert Jankowski
  The aim of the study is to show a comparison between the nonlinear viscoelastic model and the Hertzdamp model, both of them considered as Hertz contact law force-based models in conjunction with nonlinear damper. The results for two different impact experiments as well as for shaking table experiments on pounding between two steel towers excited by harmonic waves are used in this study. In addition, a suit of thirty ground motion records from thirteen different earthquakes is applied to simulate pounding between two single degree of freedom systems of different period ratios. The results of the study show that the nonlinear viscoelastic model gives smaller simulation errors in the impact force time histories comparing to the Hertzdamp model. It also provides smaller displacement and acceleration amplifications of the pounding-involved structural response under earthquake excitation. On the other hand, the Hertzdamp model has been found to be more accurate than the nonlinear viscoelastic model in simulation of impact velocity for pounding of structures under harmonic excitation.
 
 
 
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