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- 저자 : Jinhu Zhang (검색결과 3 건)
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Jinhu Wang,Qingliang Zhao,Chunyu Zhang,Bing Guo,Julong Yuan 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.4
In order to improve the grinding wheel wear during the sapphire steep aspheric surface grinding process, a SiC-reinforced resin-bonded hemispherical diamond wheel was used and the arc envelope grinding performance was investigated. Firstly, the mapping relationship between the contours of the grinding wheel and the aspheric surface was established based on the grinding conditions. The wear of the hemispherical diamond wheel was modelled, and the result indicates that the maximum wear occurred at the edge of the hemisphere, decreases along the generatrix and increases near the center. Then, the formtrued diamond wheel was used for grinding the sapphire steep aspheric surface. The concave and convex surface form error obtained at the central part of Φ 50 mm are 2.5 μm and 1.3 μm, respectively. The surface roughness R a is 230–450 nm, which is affected by the material removal rate and the sapphire crystal anisotropy. The SiC-reinforced resin-bonded diamond wheel possesses favorable self-sharpening ability and sufficient diamond grain retention capacity for sapphire grinding. The wear distribution shows that the most severe wear parts of the grinding wheel are at the edge and the center of the grinding zone, which is consistent with the model-predicted results.
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Experimental studies on gasification of the Shenmu coal char with CO2 at elevated pressures
Wang Mingmin,Zhang Jiansheng,Zhang Shouyu,Wu Jinhu,Yue Guangxi 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6
The gasification rates of Shenmu coal chars with CO2 were experimentally studied with a pressurized thermo- gravimetric analyzer (PTGA). Shenmu coal is a typical Chinese coal, and the coal char was prepared by a fixedbed reactor in nitrogen at 900 oC. The experiments were carried out in the dynamic heating segments from 750 oC to 1,000 oC, and the reaction pressure increased from 0.1MPa to 3.1MPa with pure CO2. The external diffusion resistances were minimized by increasing the flow rates and decreasing the thickness of sample layer before the test, to ensure the reactions were under kinetic control. The results show that the gasification rates increase proportionally to the 0.1 power of the CO2 partial pressure. The unreacted-core shrinking model was applied to predict the reaction rate by changing the molar fraction of CO2 at 0.6Mpa and 1.6Mpa total pressures, which showed a good match with experimental data.
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Development of SSR molecular markers for Allium mongolicum
Jing Hu,Xiaoke Hu,Qian Zhang,Jinhu Zhang,Baoli Fan,Qiushi Yu 한국유전학회 2017 Genes & Genomics Vol.39 No.12
Allium mongolicum is high palatability, nutrient, medicinal value and drought resistance wild plant. However, a lack of molecular markers of this plant results in a series of genetic questions remain largely unknown, including molecular marker data, population genetic structure and accuracy of genetic breeding. In this study, a total of 1,409,706 quality- filtered and trimmed reads were obtained from the normalized genomic DNA of pooled A. mongolicum individuals. These sequences were assembled into 2,093,593 high quality contigs, and a total of 219 simple sequence repeats loci were screened. Sixty of them were selected to validate amplification and to determine the degree of polymorphism in the genomic DNA pools. Fifteen primer pairs successfully amplified DNA fragments and detected significant amounts of polymorphism. The number of alleles in ten geographically diverse A. mongolicum populations ranged from 3 to 8 per locus. The observed and expected heterozygosities ranged from 0.350 to 0.860 and 0.516 to 0.931, respectively. Our results provide a valuable resource for A. mongolicum research.
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