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Your search keyword '"Wang, Hai-Yan"' showing total 11 results
Start Over Author "Wang, Hai-Yan" Journal chinese physics letters
11 results on '"Wang, Hai-Yan"'

8. Pressure Effects on Solid State Phase Transformation of Aluminium Bronze in Cooling Process

Author

Chen Yan, Li Fei, Liu Yu-Wen, Wang Wen-Kui, Wang Hai-Yan, Liu Jian-Hua, and Peng Gui-Rong

Subjects
Materials science, Metallurgy, General Physics and Astronomy, chemistry.chemical_element, Activation energy, engineering.material, Microstructure, Kinetic energy, Transformation (music), chemistry, Aluminium, Phase (matter), engineering, Aluminium bronze, Bronze
Abstract

Effects of high pressure (6 GPa) on the solid state phase transformation kinetic parameters of aluminum bronze during the cooling process are investigated, based on the measurement and calculation of its solid state phase transformation temperature, duration and activation energy and the observation of its microstructures. The results show that high pressure treatment can reduce the solid phase transformation temperature and activation energy in the cooling process and can shorten the phase transformation duration, which is favorable when forming fine-grained aluminum bronze.

Published
2009

9. Criticality of Epidemic Spreading in Mobile Individuals Mediated by Environment

Author

Fang Pin-Jie, LI Zhi-Cong, HE Min-Hua, Zhang Duan-Ming, and Wang Hai-yan

Subjects
Physics, Phase transition, education.field_of_study, Percolation critical exponents, Critical phenomena, Population, General Physics and Astronomy, Renormalization group, Directed percolation, Critical point (thermodynamics), Quantitative Biology::Populations and Evolution, Statistical physics, education, Critical exponent
Abstract

We investigate the critical behaviour of an epidemical model in a diffusive population mediated by a static vector environment on a 2D network. It is found that this model presents a dynamical phase transition from disease-free state to endemic state with a finite population density. Finite-size and short-time dynamic scaling relations are used to determine the critical population density and the critical exponents characterizing the behaviour near the critical point. The results are compatible with the universality class of directed percolation coupled to a conserved diffusive field with equal diffusion constants.

Published
2009

10. Structural and Electronic Properties, and Pressure-Induced Phase Transition of Layered C5N: a First-Principles Investigation.

Author

Hu Qian-Ku, Wang Hai-Yan, Wu Qing-Hua, He Ju-Long, and Zhang Guang-Lei

Subjects
*CARBON compounds, *PHASE transitions, *CONFIGURATIONS (Geometry), *GRAPHITE, *PSEUDOPOTENTIAL method, *DENSITY functionals, *ELECTRIC properties
Abstract

Seven layered C5N configurations constructed from hexagonal BN and graphite structures are studied using an ab initio pseudopotential density functional method. The structural and electronic properties, and pressure-induced phase transition are investigated by calculating the total energy, structural parameter, formation energy, elastic constant, band structure and electron density of state. The results show that the three C5N configurations constructed from the h-BN structure are more stable energetically than those four configurations from graphite structure. The C5N-I configuration with the highest symmetry and the AA stacking sequence along the c-axis is the most stable. This structure is stable mechanically and its phase separation is difficult. The C5N phase is expected to have a metallic character. A critical pressure of about 20GPa is predicted for the synthesis of a monoclinic C5N phase from the layered C5N phase. [ABSTRACT FROM AUTHOR]

Published
2011
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11. Effects of 3 GPa High Pressure Treatment on the β1→α + α2 Phase Transition Dynamics of TC4 Titanium Alloy.

Author

WANG Hai-Yan, CHEN Yan, LIU Jian-Hua, and WANG Wen-Kui

Subjects
*PHASE transitions, *TITANIUM alloys, *DIFFERENTIAL scanning calorimetry, *HIGH pressure (Science), *ACTIVATION energy
Abstract

(Received 11 December 2012) The temperature, duration, activation energy, and Avrami exponent of the solid phase transformation β1→ α + α2 of TC4 titanium alloy treated at 3GPa in a cooling process are calculated by means of differential scanning calorimetric curves. Then the effects of high pressure on the β1→α + α2 phase transformation dynamics of TC4 alloy in a cooling process are investigated. The results show that 3GPa high pressure treatment can increase the activation energy of the TC4 alloy. The beginning time, end time, and duration of the β1→α + α2 phase transition of the 3GPa high pressure treated TC4 alloy at the cooling rate of 10°C/min are increased by 2.90°C, 7.78°C and -29.28 s respectively. It is known that 3GPa high pressure treatment has little effect on the phase transition mechanism. [ABSTRACT FROM AUTHOR]

Published
2013
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