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An investigation of local structures and EPR spectra for Cu2+ and VO2+ in biochar
Chang-Chun Ding,Xiao-Hong Chu,Zhi-Xiang Fan,Jia Fu 한국물리학회 2020 Current Applied Physics Vol.20 No.2
Electron paramagnetic resonance (EPR) technology had been adopted to analyze the structures and properties of Cu2+ and VO2+ in Biochar (BG1 and BG2), but the local structural properties have not been clarified up to now. In present work, three possible structures (orthorhombically, rhombically and tetragonally elongated octahedra) are proposed for Cu2+ in BG1 and BG2 samples, and the former seems most reasonable in view of the best agreement between the theoretical EPR parameters based on the perturbation formulae and the experimental data. As for the VO2+ center, unlike the previous assignment of the tetragonally elongated [VO5]6− cluster based on the simple formulae of EPR parameters, presently proposed tetragonally compressed [VO6]8− cluster and the high order perturbation formulae of the EPR parameters yields good agreement with the observed values. This point is also supported by the d-d optical absorption 2B1g →2B2g for tetragonally compressed octahedral 3 d1 systems.
Composite action of hollow concrete-filled circular steel tubular stub columns
QIANG FU,Fa-Xing Ding,Tao Zhang,Liping Wang,Chang-jing Fang 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.26 No.6
To better understand the influence of hollow ratio on the hollow concrete-filled circular steel tubular (H-CFT) stub columns under axial compression and to propose the design formula of ultimate bearing capacity for H-CFT stub columns, 3D finite element analysis and laboratory experiments were completed to obtain the load-deformation curves and the failure modes of H-CFT stub columns. The changes of the confinement effect between core concrete and steel tube with different hollow ratios were discussed based on the finite element results. The result shows that the axial stress of concrete and hoop stress of steel tube in H-CFT stub columns are decreased with the increase of hollow ratio. After the yield of steel, the reduction rate of longitudinal stress and the increase rate of circumferential stress for the steel tube slowed down. The confinement effect from steel tube on concrete also weakened slowly with the increase of hollow ratio. Based on the limit equilibrium method, a simplified formula of ultimate bearing capacity for the axially loaded H-CFT stub columns was proposed. The predicted results showed satisfactory agreement with the experimental and numerical results.
Baohua Wang,Rong Fu,Mi Zhang,Zhenqian Ding,Lei Chang,Xinyu Zhu,Yafeng Wang,Baoxiang Fan,Wuwei Ye,Youlu Yuan 한국유전학회 2015 Genes & Genomics Vol.37 No.8
A methylation-sensitive amplification polymorphism method based on capillary electrophoresis was used to analyze DNA methylation levels in three cotton accessions, two salt-tolerant accessions CCRI 35 and Zhong 07 and one salt-sensitive accession CCRI 12. Many categories of DNA methylation happened in the three cotton accessions under salt treatment, including hypermethylation, hypomethylation, and other patterns. Hypermethylation happened at a significantly higher rate than that of hypomethylation in salt-tolerant accessions CCRI 35 and Zhong 07. On the contrary, in salt-sensitive accession CCRI 12, hypomethylation happened at a significantly higher rate than that of hypermethylation. In general, the global DNA methylation level significantly increased under salt stress in both salt-tolerant accessions CCRI 35 and Zhong 07, whereas there was no significant difference in the salt-sensitive accessions CCRI 12. Our results suggested that salt-tolerant cotton might have a mechanism of increasing the methylation level when responding to salt stress; the increase of the global level of DNA methylation and also different methylation patterns might play important roles in tolerance to salt stress in cotton. Some interesting genes were found through cloning and analysis of differently methylated DNA sequences, which might contribute to salt tolerance in cotton.
The Influence of Hi-flux Powders Characteristics on the Performance of Magnetic Powder Cores
Zhao Tong Chun,Ma Hong Qiu,Ding Fu Chang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The influence of Hi-flux powders characteristics on the performance of magnetic powder cores was studied. It was found that different cooling rate and nozzle configuration could change the shape and microstructure of powders. Smooth surface and spherical shape of powders were beneficial to improve DC bias performance and reduce core losses of magnetic powder core.
Effect of FeNi30 Powder Catalyst by Water Atomizing on Synthesis High-grade Diamond
Cheng Dong-kai,Ma Hong-qiu,Cao Dan,Ding Fu-chang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
This paper described the preparation method for composing high-grade synthetic diamond by water atomizing using FeNi30 powder catalyst. The objective of this article is about powder making process using super high water atomizing in the atmosphere of inert gas, and then corroded the powder with a corrosion inhibitor. Finally, FeNi30 catalyst powder with lower oxygen content and good sphericity is produced. The experiment of making diamonds by using cubic press and the performance of the diamonds are also discussed.