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Molecular Dynamics Simulation of Tungsten Ablation under Transient Heat Flux
ZHU Yizhou;YAN Sha?;XUE Jianming;HE Shukai;ZHANG Boyao;WANG Yugang
2015, 51 (
4
): 596-600. DOI:
10.13209/j.0479-8023.2015.015
Abstract
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1151
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The authors adopt molecular dynamics simulations to get a basic physical image of the tungsten ablation phenomenon induced by intense pulsed ions irradiation. A one-dimension heat transfer model is set up and a series of simulations with different pulse energy fluences are applied. Ablation threshold and ablation depth are calculated and compared with thermal dynamic theoretical values. Energy allocation condition of the simulation system are discussed, which depends on whether the pulse energy exceed ablation threshold. Based on the calculation results, the authors drew a preliminary profile of tungsten ablation under a transient high heat flux brought by energetic ions.
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Characteristic of the Cellulose Immobilized on Aminated SiO
2
ZHANG Boya,YANG Ting,HU Xia,ZHANG Jianbo
Acta Scientiarum Naturalium Universitatis Pekinensis
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906
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The immobilized cellulase was prepared by using aminated SiO
2
with glutaraldehyde as crosslinking agent. The best immobilized reacting condition were glutaraldehyde concentration of 4% (v/v), crosslinking time for 60 minutes, cellulase dosage of 35 U/g and reaction time for 5 hours. The obtained immobilized cellulase displayed best enzyme activity. Compared with free cellulase, immobilized one had lower sensitivity to pH and temperature of reacting system and higher time stability and thermal stability. The immobilized cellulase had higer Ed, ΔH
*
, ΔS
*
and ΔG
*
to thermo inactivation reaction, which showed that the immobilization slowed down the inactivation velocity of cellulase and reduced the potentiality of inactivation reaction.
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Transient Thermal Response of Pure and Oxide Dispersion Strengthened Tungsten Alloys
HE Shukai,YAN Sha,ZHU Yizhou,ZHANG Boyao,XUE Jianming,WANG Yugang
Acta Scientiarum Naturalium Universitatis Pekinensis
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666
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Thermal response of pure and two kinds of oxide dispersion strengthened tungsten alloys were investigated using intense pulsed ion beam (IPIB) device. Scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX) were used to examine the surface modifications and the distributions of dispersion elements. By comparing the results, it is found that pure tungsten show a better resistance to thermal shock. From the perspective of the tolerance of heat load, WL10 and WYT are not recommended for PFMs.
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Prediction of HFC-23 Emission and Analysis of CDM Project Impact in China
FENG Jinmin,YAN Huanghuang,ZHANG Boya,ZHANG Jianbo
Acta Scientiarum Naturalium Universitatis Pekinensis