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Hydrothermal Synthesis and Microstructural, Optical Properties Characterization of YVO_4 Phosphor Powder

100%
Zhang S., Liang Y., Gao X., Liu H.
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2014
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vol. 125
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issue 1
105-110
EN
The phonon energy of YVO_4 crystal is lower than other usual compounds of salt. So it is suitable as host material for down-conversion materials. Hydrothermal method was adopted to synthesize YVO_4 phosphor powder with the use of yttrium oxide and sodium vanadate as raw material. The change in the relative integral intensity of the (200) and (112) diffraction peaks indicates that macroscopic stress in the lattice obviously changes with the elevated hydrothermal reaction temperature. The YVO_4 phosphor powder synthesized involves a certain agglomeration of small particles. The phonon vibration in the YVO_4 originates mainly from the internal vibrations in the vanadium-oxygen tetrahedron, in addition to the Y-O and O-H vibrations. Due to a low phonon energy of only 2.8188 × 10^{-21} J, YVO_4 helps to improve the down-conversion efficiency of rare-earth ions. A bandgap value of approximately 3.8 eV for the synthesized YVO_4 powders leads to good absorption properties in the ultraviolet region. Upon excitation by the 320 nm ultraviolet photon, the intrinsic emission of YVO_4 powders is annihilated, and a broadband emission of VO_4^{3-} near 450 nm is observed at room temperature. The YVO_4 phosphor powder synthesized at 180C exhibits the maximum photoluminescence intensity because of its excellent crystallization.
2
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Horse-Expert: An aided expert system for diagnosing horse diseases

100%
Wang H., Qin H., Xiao J., Gao X.
Polish Journal of Veterinary Sciences
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2016
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issue 4
3
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Electric Interaction between Two Identical Conducting Spheres in a Uniform Electric Field

88%
Gao X., Wang Q., Li C., Hu L., Sun G.
Acta Physica Polonica A
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2015
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vol. 128
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issue 3
289-293
EN
An experimental apparatus is devised to measure the interaction between two spheres separated by a small gap in a uniform electric field. The results show that the interaction between two conducting spheres is near that between two dielectric spheres with high permittivity. Accordingly, the calculation can be simplified by mirror image method, for it is only available for conducting system. A method using multiple mirror images of point charges is put forward to analyze the induction of two identical conducting spheres in a uniform electric field. The key operation on how to add compensative charges is emphasized and given out in detail. The results from experiment and calculation are compared, and they agree with each other very well.
4

Detecting a deletion in the coding region of the bovine bone morphogenetic protein 15 gene (BMP15)

64%
Zhang L.-P., Gan Q.-F., Zhang X.-H., Li H.-D., Hou G.-Y., Li Y.-J., Gao X., Ren H.-Y., Chen J. B., Xu S.-Z.
Journal of Applied Genetics
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2009
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vol. 50
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issue 2
145-148
EN
The aim of this study was to detect polymorphism in the bovine bone morphogenetic protein 15 (BMP15) gene. On the basis of PCR-SSCP and DNA sequencing, a 4-bp deletion was identified in the coding region of the gene. Sequence analysis revealed that the deletion altered the reading frame and introduced a stop codon at position 264. Eight breeds (Luxi, Qinchuan, Nanyang, Jinnan, Bohai Black, Menggolian, Holstein, and Simmental) were genotyped by PCR-SSCP. No cows homozygous for this mutation were observed in these breeds. Heterozygous cows were detected in Luxi, Qinchuan, Nanyang, Jinnan and Bohai Black cattle. Fecundity was not increased in heterozygous individuals.
5

Association analysis of thyroglobulin gene variants with carcass and meat quality traits in beef cattle

64%
Gan G.-F., Zhang L.-P., Li J.-Y., Hou G.-Y., Li H.-D., Gao X., Ren H.-Y., Chen J.-B., Xu S.-Z.
Journal of Applied Genetics
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2008
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vol. 49
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issue 3
251-255
EN
Thyroid hormones play an important role in regulating the metabolism and can affect the homeostasis of fat deposition. The gene encoding thyroglobulin (TG), producing the precursor for thyroid hormones, has been proposed as a positional and functional candidate gene for a QTL with an effect on fat deposition. In the present study, we identified 6 novel SNPs at the 3? flanking region of the TG gene. The SNP marker association analysis indicated that the SNP markers G133C, G156A, C220T and A506C were significantly associated with marbling score (P<0.05, N=271). Animals with the new homozygote genotype had higher marbling scores than those with the other genotypes. Besides, the linkage disequilibrium analysis indicated that these 4 SNPs were completely linked (r2 = 1). Results of this study suggest that the TG-gene-specific SNP may be a useful marker for meat quality traits in future marker-assisted selection programmes in beef cattle.
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