Study on the Hydrothermal Synthesis and Optical Properties of YVO4:Dy3+ Phosphor Powders

Hong-Tao Liu,Yan Liang,Xiao-Yong Gao,Sa Zhang,Xian-Wei Zhao,Xian-Mei Chen 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.8

YVO4:Dy3+ phosphor powders were synthesized by using the hydrothermal method under differentpH conditions. The crystallization, surface morphology, lattice vibration, optical properties,luminescent mechanism and influencing factors of the obtained YVO4:Dy3+ phosphor powders werecarefully studied and analyzed in detail. All of the YVO4:Dy3+ phosphor powders had tetragonalstructures, and the pH value had a significant impact on the surface morphology, structure andoptical properties of the synthesized samples. Strong acidic and alkali environments were favorablefor the crystallization of YVO4:Dy3+phosphor powders, and the YVO4:Dy3+ phosphor powderssynthesized under strong alkali environments had the best luminescent properties.

Study of the flow around a cylinder from the subcritical to supercritical regimes

Zhang, Xian-Tao,Li, Zhi-Yu,Fu, Shi-Xiao,Ong, Muk Chen,Chen, Ying Techno-Press 2014 Ocean systems engineering Vol.4 No.3

The objective of the present simulations is to evaluate the applicability of the standard $k-{\varepsilon}$ turbulence model in engineering practice in the subcritical to supercritical flow regimes. Two-dimensional numerical simulations of flow around a circular cylinder at $Re=1{\times}10^5$, $5{\times}10^5$ and $1{\times}10^6$, had been performed using Unsteady Reynolds-Averaged Navier Stokes (URANS) equations with the standard $k-{\varepsilon}$ turbulence model. Solution verification had been studied by evaluating grid and time step size convergence. For each Reynolds number, several meshes with different grid and time step size resolutions were chosen to calculate the hydrodynamic quantities such as the time-averaged drag coefficient, root-mean square value of lift coefficient, Strouhal number, the coefficient of pressure on the downstream point of the cylinder, the separation angle. By comparing the values of these quantities of adjacent grid or time step size resolutions, convergence study has been performed. Solution validation is obtained by comparing the converged results with published numerical and experimental data. The deviations of the values of present simulated quantities from those corresponding experimental data become smaller as Reynolds numbers increases from $1{\times}10^5$ to $1{\times}10^6$. This may show that the standard $k-{\varepsilon}$ model with enhanced wall treatment appears to be applicable for higher Reynolds number turbulence flow.

Molecular characterization of novel haplotypes of eIF4E family in Chinese cabbage (Brassica rapa L. ssp. pekinensis)

Shuan-Tao Liu,Zhi-Gang Zhang,Qiao-Yun Li,Shu-Fen Wang,Zhi-Zhong Zhao,Jin-Dong Lu,Wen-Ling Xu,Xian-Xian Liu,Wei-Min Fu 한국유전학회 2013 Genes & Genomics Vol.35 No.6

Two genes coding for eukaryotic translation initiation factors, eIF4E.a and eIF4E.c, were isolated from twelve accessions of Chinese cabbage (Brassica rapa L. ssp. pekinensis). Polymorphism analysis revealed that 94and 142 polymorphic sites were characterized from allele of BraeIF4E.a and BraeIF4E.c which produced complex haplotype structures. Six novel haplotypes were characterized from the two alleles respectively. Among the six novel haplotypes of BraeIF4E.a, three loss-of-function mutations were identified in which a conserved single nucleotide deletion mutation cause the early termination of BraeIF4E.a coding product; while for six new BraeIF4E.c haplotypes, their coding product show amino acid substitution mutations on non-conservative amino acid residues which might affect TuMV infection in Chinese cabbage.

ALMOST RIGIDITY OF CONVEX HYPERSURFACES VIA THE EXTINCTION TIME OF MEAN CURVATURE FLOW

Huang, Xian-Tao Korean Mathematical Society 2021 대한수학회보 Vol.58 No.4

We prove that if a compact convex hypersurface of ℝⁿ⁺¹ has almost maximal extinction time when it is evolved by the mean curvature flow, then it must be nearly round in the C⁰-norm.

Significance of Caveolin-1 Regulators in Pancreatic Cancer

Chen, Tao,Liu, Liang,Xu, Hua-Xiang,Wang, Wen-Quan,Wu, Chun-Tao,Yao, Wan-Tong,Yu, Xian-Jun Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.8

Caveolin-1 is a scaffold protein on the cell membrane. As the main component of caveolae, caveolin-1 is involved in many biological processes that include substance uptake and transmembrane signaling. Many of these processes and thus caveolin-1 contribute to cell transformation, tumorigenesis, and metastasis. Of particular interest are the dual rolesof tumor suppressor and oncogene that caveolin-1 appear to play in different malignancies, including pancreatic cancer. Therefore, analyzing caveolin-1 regulators and understanding their mechanisms of actionis key to identifying novel diagnostic and therapeutic tools for pancreatic cancer. This review details the mechanisms of action of caveolin-1 regulators and the potential significance for pancreatic cancer treatment.

Passive Smoking and Cervical Cancer Risk: A Meta-analysis Based on 3,230 Cases and 2,982 Controls

Zeng, Xian-Tao,Xiong, Ping-An,Wang, Fen,Li, Chun-Yi,Yao, Juan,Guo, Yi Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.6

Objective: Passive smoking has been considered as a risk factor of many cancers. To examine whether it might also pose a risk for cervical cancer, we performed a meta-analysis based on published case-control studies. Methods: We searched the PubMed database and references of included studies up to February 10th, 2012 for relevant studies. After two authors independently assessed the methodological quality and extracted data, a meta-analysis was conducted using CMA v2 software. Publication bias was evaluated by funnel plot, using Egger's and Begg's tests. Results: Finally 11 eligible studies yielded, involving 3,230 cases and 2,982 controls. The results showed that women who never smoke but exposed to smoking experience a 73% increase in risk of cervical cancer compared with non-exposed women (OR = 1.73, 95% CI = 1.35 - 2.21, p<0.001). Subgroup and sensitivity analyses indicated this result to be robust. Moderate publication bias was detected by visualing funnel plot, Egger's and Begg's tests. Conclusion: Based on currently available evidence, the findings of this meta-analysis suggests that passive smoking significantly and independently increases the risk of cervical cancer.

Declutching control of a point absorber with direct linear electric PTO systems

Zhang, Xian-Tao,Yang, Jian-Min,Xiao, Long-Fei Techno-Press 2014 Ocean systems engineering Vol.4 No.1

Declutching control is applied to a hemispherical wave energy converter with direct linear electric Power-Take-Off systems oscillating in heave direction in both regular and irregular waves. The direct linear Power-Take-Off system can be simplified as a mechanical spring and damper system. Time domain model is applied to dynamics of the hemispherical wave energy converter in both regular and irregular waves. And state space model is used to replace the convolution term in time domain equation of the heave oscillation of the converter due to its inconvenience in analyzing the controlled motion of the converters. The declutching control strategy is conducted by optimal command theory based on Pontryagin's maximum principle to gain the controlled optimum sequence of Power-Take-Off forces. The results show that the wave energy converter with declutching control captures more energy than that without control and the former's amplitude and velocity is relatively larger. However, the amplification ratio of the absorbed power by declutching control is only slightly larger than 1. This may indicate that declutching control method may be inapplicable for oscillating wave energy converters with direct linear Power-Take-Off systems in real random sea state, considering the error of prediction of the wave excitation force.

Antioxidant capacity, flavor and physicochemical properties of FH06 functional beverage fermented by lactic acid bacteria: a promising method to improve antioxidant activity and flavor of plant functional beverage

Yan Xian-Tao,Zhang Ziqi,Wang Yubao,Zhang Wenmiao,Zhang Longfei,Liu Yang,Chen Dawei,Wang Wenqiong,Ma Wenlong,Qian Jian-Ya,Gu Ruixia 한국응용생명화학회 2023 Applied Biological Chemistry (Appl Biol Chem) Vol.66 No.-

The ability of natural plants to treat chronic diseases is closely related to their antioxidant function. Lactic acid bacteria (LAB) fermentation is an effective way to improve the nutritional value, biological activity and flavor of food. This study investigated the pH, titratable acidity, total polysaccharide, total flavone, total saponin, total polyphenol, and antioxidant activity of the FH06 beverage before and after probiotic fermentation. Results: After fermentation, FH06 had lower contents of total polysaccharides, total flavonoids, total saponins and total polyphenols but higher titratable acidity. The antioxidant activity was tested by total antioxidant capacity (FRAP method) and DPPH· scavenging ability. The FRAP value significantly increased after fermentation (P < 0.05), and the maximum increase was observed for Lactobacillus fermentum grx08 at 25.87%. For DPPH· scavenging ability, the value of all fermentations decreased, and L. fermentum grx08 had the smallest reduction at 2.21% (P < 0.05). The results of GC–MS and sensory analysis showed that fermentation eliminated bad flavors, such as grass, cassia and bitterness, and highlighted the fruit aroma and soft sour taste. Conclusion: The FRAP value and sensory flavor of FH06 fermentation by L. fermentum grx08 were significantly improved, indicating its great potential as a functional food with both strong antioxidant activity and good flavor.

Research on the Surface Characteristics of Hardened Steel with Variable Chamfer Edge PCBN Insert by High-Speed Hard Turning

Xian-li Liu,Su-Yan Li,Tao Chen,Dao-Yuan Wang 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.2

In this paper, high-speed cutting tests for hardened steel were carried out where PCBN inserts with variable chamfer and fixed chamfer were employed. The aim of the tests was to investigate the influence of cutting speed and tool wear of variable chamfer insert on the machined surface topography, micro-characteristics and micro-hardness, where comparison and analysis of the machined surface properties were also carried out for the surface produced by the fixed chamfer tool. Experimental results showed that machined surface morphologies become more complex and rough, and peaks appear to a trend towards steepness, with the flank wear increase of the variable chamfer tool. At the same time, the thickness of white layer, hardening depth and hardening degree of the machined surface increase dramatically. With the increase in cutting speed of the variable chamfer tool, it is of primary importance to consider phase transition effects caused by thermal load, which will result in increase in the thickness of white layer on the machined surface. Moreover, it will also lead to decrease in the thickness and deformation degree of plastically deformed layer caused by mechanical load. Compared to the fixed chamfer tool, the cutting force generated by the variable chamfer tool is relatively small, where the flank wear area is also smaller and the groove wear marks is shallower. Therefore, better surface roughness can be obtained by utilizing the variable chamfer tool. In particular, the gap between the roughness of the machined surface formed by two tools becomes more pronounced in the scenarios of high speed and severe wear. Moreover, the thickness of white layer, the depth and degree of hardened layer are relatively small for the variable chamfer tool. Therefore, the surface properties produced by the variable chamfer tool would be more desirable.

Novel genetic variants of sine oculis homeobox homolog 3 gene are associated with body weight and average daily gain in Bos taurus

Xian-Yong Lan,Chu-Zhao Lei,Yong-Tao Huai,Chuan-Ying Pan,Jing Wang,Yong-Zhen Huang,Hong Chen 한국유전학회 2011 Genes & Genomics Vol.33 No.6

Sine oculis homeobox homolog 3 (Six3) gene is responsible for normal mammalian pituitary development, and its genetic variations or deficiency will cause hypopituitarism, suggesting that this gene is a potential candidate gene for studying association with growth traits in animals. Herein, genetic variants within bovine Six3 gene was screened in 1031 individuals from four Chinese indigenous cattle breeds. Two novel polymorphisms (NC_007309:g.2515G>A and NC_007309:g.2607T>C) locating at positions nt1707 and nt1799 of intron 1 in bovine Six3gene, were found, and could be genotyped by TaqI ACRS PCR-RFLP and Alw26I PCR-RFLP, respectively. The frequencies of allele “A” of TaqI locus varied from 0.004 to 0.309,as well as the frequencies of allele “C” of Alw26I locus waved from 0.025 to 0.340. Association analysis revealed no significant association of TaqI locus with growth traits in Nanyang breed. However, significant relationships between Alw26I locus and body weight (BW) and average daily gain (ADG) in Nanyang breed was found (p<0.05). The individuals with genotype TC had greater body weight and average daily gain than those with genotype TT at 18 months old. Furthermore, based on combinated genotypes from these two loci, diplotypes was found to be associated with growth traits (p<0.05).The individuals with dihaplotype GG-TC had greater body weight and average daily gain at 18 month-old than those of other dihaplotypes. Therefore, the TaqI and Alw26I genetic variants of bovine Six3 gene were recommended as DNA markers related to growth traits through marker-assisted selection for genetics and breeding in cattle.