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Articles by X.H. Zhang
Total Records ( 3 ) for X.H. Zhang
  T.S. Xu , L.H. Gu , X.H. Zhang , W. Huang , B.G. Ye , X.L. Liu and S.S. Hou
  Breast Muscle (BM) and Leg Muscle (LM) in Pekin duck belong to different types. However, myofiber differences of BM and LMcle and relationship between myofiber development with the expressions of IGF-1 and FoxO3 are not clear. The difference of BM and LM fibres was investigated and relationship between the two gene expressions and myofiber development was explored at D2 (the 2nd day), W2 (the 2nd week), W4, W6. Results showed the development of BM and LM fibres were different as the Relative Growth Areas (RGAs) of BM and LM fibres reached their maximum values at W4-W6 and W2-W4, respectively. The expression of IGF-1 peaked while that of FoxO3 bottomed, at W6 and W2 in BM and LM, respectively. The results of this study could provide basic insight into the skeletal muscle development, the expressions of IGF-1 and FoxO3 and the association between the two aspects.
  X.Y. Zhang , M.L. Zhou , X.H. Zhang and D.J. Wu
  To evaluate the genetic polymorphisms and to search for available molecular markers for Liangshan semi-wool sheep, 15 microsatellite markers of 187 samples were amplified by multiplex PCR. A total of 133 alleles were detected, with the number of alleles ranging from 6 (BM2830) to 15 (McM130), giving a mean No. of 8.87 alleles per locus. The total and mean effective allele No. were 64.29 and 4.29, respectively. The observed heterozygosity and expected heterozygosity were from 0.4486 (McM130) to 0.8877 (BMS1678) and 0.5704 (BMS0887) to 0.8373 (McM130), respectively. Mean observed heterozygosity and mean expected heterozygosity were 0.672 and 0.7536. Polymorphism information content values were from 0.5202 (BMS0887) to 0.8183 (McM130) and mean polymorphism information content of the 15 microsatellite loci was 0.7184. All 15 microsatellite loci were highly polymorphic, which showed that there were rich genetic polymorphisms at these detected microsatellite loci in Liangshan semi-wool sheep. Comparison of allele distributions among loci did not reveal consistent shapes. Distributions were centralized in some cases, whereas in others some kind of skewness was evident. Complex evolution at these loci is an important factor in the irregularity of microsatellite distributions.
  J. Lin , Z.L. Wu , X.H. Zhang , B. Mishra , J.J. Moore and W.D. Sproul
  Chromium nitride (CrNx) coatings were prepared by reactively sputtering chromium metal target with various nitrogen flow rate percentages (fN2) using a closed field unbalanced magnetron sputtering system operated in dc and middle frequency pulsed condition (100 kHz and 50% duty cycle). In this study, plasma examination proved that a large amount of ions with a wide range of ion energies (up to 65 eV and mainly from 10–30 eV region) was identified in the pulsed plasma compared to the low ion flux and energy (0–10 eV) in a dc discharged plasma. The results showed that the phase structure of CrNx coatings was changed from nitrogen doped Cr(N) to pure β-Cr2N, and to a mixture of β-Cr2N and c-CrN and then to pure c-CrN phases with an increase in the fN2 in both dc and pulsed conditions. However, the pulsed CrNx coatings exhibit lower N concentrations than dc CrNx coatings prepared under the same fN2, which leads to the existing of β-Cr2N phase within a wide range of fN2 (30–50%). In comparison with the typical large columnar structure in the dc sputtered coatings, the pulsed CrNx coatings exhibit dramatic microstructure improvements which benefited from the improved plasma density and ion bombardment from the pulsed plasma, where the super dense and nearly equi-axial structures were observed in a wide range of fN2. The microstructure improvements contributed to the enhancements in the hardness and wear resistance of pulsed CrNx coatings. In the pulsed CrNx coatings, the hardness values were above 30 GPa when the fN2 is in the range of 30–40%, which is related to the formation of the β-Cr2N phase. With the formation of a mixture of β-Cr2N and c-CrN phases in the coatings deposited with 40–50% fN2, a low COF of 0.36 and wear rate of 1.66 × 10− 6 mm3 N− 1 m− 1 can be achieved.
 
 
 
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