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The equation-of-states of Jilin ordinary chondrite and Nandan iron meteorite

Science China Earth Sciences 1997年第4期40卷 403-410页

作者：戴诚达金孝刚傅世勤施尚春王道德 National Laboratory of Shock Wave and Detonation Physics Chinese Academy of Engineering PhysicsChengdu 610003 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

Shock wave data for Jilin ordinary chondrite and Nandan iron meteorite are measured by electric-pin techniques on the dynamic high-pressure device equipped with a two-stage light gas gun, and then equation-of-states supposedly fit for describing their P-V-E relations are chosen to evaluate the values of their parameters. Demonstrated from the comparison between P-V curves of equation-of-states and experimental data points, P-V relation of Jilin ordinary chondrite can be described by the universal equation-of-state, of which bulk modulus value of zero-pressure K0s = 48.10 GPa, its pressure derivative K'os = 4.13. That of Nandan iron meteorite can be described by the three-term form of equation-of-state, of which the values of two matter parameters Q = 41.23531 GPa, 5 = 12.271 79. The Hugoniot data and equation-of-states for Jilin ordinary chondrite and Nandan iron meteorite are first reported in this paper. The equation-of-state defined by Hugoniot data measurement provides strong empirical support for describing the compression of meteorites to high pressure.

关键词： meteorite Hugoniot curve equation-of-state

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Melting Behaviour of Mo by Shock Wave Experiment

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Chinese Physics Letters 2008年第8期25卷 2969-2972页

作者：张修路蔡灵仓陈军徐济安经福谦 Lab for Shock Wave and Detonation Physics Research Institute of Fluid Physics China Academy of Engineering Physics PO Box 919-102 Mianyang 621900 Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 Beijing Institute of Applied Physics and Computational Mathematics Beijing 100088 Beijing Institute of Applied Physics and Computational Mathematics Beijing 100088

In order to clarify the apparent discrepancy in determinations of melting temperature Tm of Mo between diamondanvil cell （DA C） measurements from 0 to about 100 GPa and shock wave （SW） measurement at only one pressure of about 390 GPa by comparison with visual extrapolation, we perform SW experiments to replenish more Tm data on purpose to make this comparison more directly and rationally as well. The techniques adopted consist of Hvgoniot sound velocity measurement for porous Mo and shock-induced release Tm measurements for both solid and porous Mo. Totally five SW Tm data, which extends the measured pressure range from previous about 390 GPa down to about 136 GPa that is close to the highest pressure （about 100 GPa） attained by previous DAC experiments, are therefore obtained. These measured Tm data, other than the extrapolated as mentioned above, exhibit a manner of continuous variation with pressure and can be fitted well with Lindemann melting description. More significantly, the measured Tm data at lowest pressure are still much higher than that of the DACs and the overall trend of these Tm data is against to the two-segment melting curve model, with a sudden change in dTm/dp at about 210 GPa, previously proposed by Errandonea [Physica B 357 （2005） 356]. Though the problem of large discrepancy in Tm data measured between DAC and SW has not been completely explained, our knowledge on this matter achieves indubitable progress since it is of value to programme the next clarification. Some suggestions for further clarifying the issue of large discrepancy between DAC and SW measurements are also proposed.

关键词： equation-of-state HIGH-PRESSURE GRUNEISEN-PARAMETER POROUS MATERIALS TEMPERATURE COMPRESSION IRON MOLYBDENUM VELOCITIES HUGONIOT

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Observation Constraints on the Simplified GCG Model

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Chinese Physics Letters 2007年第6期24卷 1782-1785页

作者：董素梅吴普训 School of Sciences and Institute of Math-Physics Central South University of Forestry and Technology Changsha 410004

A simplified version of generalized Chaplygin gas （GCG） as a dark energy model is studied. By using the latest 162 ESSENCE type Ia supernovae （She Ia） data, 30 high redshift She Ia data, the baryonic acoustic oscillation peak from SDSS and the CMB data from WMAP3, a strong constraint on this simplified GCG model is obtained. At the 95.4% confidence level we obtain 0.21 ≤ Ωm ≤ 0.31 and 0.994 〈 α 〈 1.0 with the best fit Ωm = 0.25 and a = 1. This best fit scenario corresponds to an accelerating universe with qo ≈-0.65 and z ≈ 0.81 （a redshiR of cosmic phase transition from deceleration to acceleration）.

关键词： GENERALIZED CHAPLYGIN-GAS equation-of-state SNE-IA DATA DARK-ENERGY COSMOLOGICAL CONSTANT SUPERNOVA DATA BAYESIAN-ANALYSIS MATTER UNIFICATION STATISTICS

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A Parametric Dynamic Model of Dark Energy

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Chinese Physics Letters 2006年第6期23卷 1655-1658页

作者：邓雪梅吴亚波赵国明 Department of Physics Liaoning Normal University Dalian 116029

The double complex symmetric gravitational theory is extended to the parametric symmetric gravitational theory by introducing a parameter β. Hence parametric Friedmann-Robertson-Walker equations are obtained and some characters of dark energy in corresponding spaces are discussed by taking different values of β. In our method some previous results can be included as the special case of our results. It is worth noting that some characters of dark energy can be more intuitively described in our model. By analysis, we can predict that the fate of universe would be a Big Rip in the future, and also find that the state parameters for the two different constraint conditions wФ are consistent with the present cosmological observations.

关键词： equation-of-state COSMOLOGICAL CONSTANT

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Oscillatory-like expansion of a Fermionic superfluid

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Science Bulletin 2020年第1期65卷 7-11,M0003页

作者： Xiao-Qiong Wang Yu-Ping Wu Xiang-Pei Liu Yu-Xuan Wang Hao-Ze Chen Mudassar Maraj Youjin Deng Xing-Can Yao Yu-Ao Chen Jian-Wei Pan Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modem PhysicsUniversity of Science and Technology of ChinaShanghai 201315China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

We study the expansion behaviors of a Fermionic superfluid in a cigar-shaped optical dipole trap for the whole BEC-BCS crossover and various *** low temperature(0:06(1)T_F),the atom cloud undergoes an anisotropic hydrodynamic expansion over 30 ms,which behaves like oscillation in the horizontal *** analyzing the expansion dynamics according to the superfluid hydrodynamic equation,the effective polytropic index y of equation-of-state(EoS)of Fermionic superfluid is *** y values show a non-monotonic behavior over the BEC-BCS crossover,and have a good agreement with the theoretical results in the unitarity and BEC *** normalized quasi-frequencies of the oscillatory expansion are measured,which drop significantly from the BEC side to the BCS side and reach a minimum value of 1.73 around 1/k_Fa=-0:*** work improves the understanding of the dynamic properties of strongly interacting Fermi gas.

关键词： Fermionic superfluid Oscillatory-like expansion BEC-BCS crossover equation-of-state

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