Dd Han
East China Normal University
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Featured researches published by Dd Han.
Physical Review C | 1999
YG(马余刚) Ma; QM(苏前敏) Su; WQ(沈文庆) Shen; Dd Han; J. S. Wang; X. Cai; DQ(方德清) Fang; Hy Zhang
Features of particle emission and critical point behavior are investigated as functions of the isospin of disassembling sources and temperature at a moderate freeze-out density far medium-size Xe isotopes in the framework of the isospin-dependent lattice gas model. Multiplicities of emitted light particles, isotopic, and isobaric ratios of light particles show the strong dependence on the isospin of the dissociation source, but double ratios of light isotope pairs and the critical temperature determined by the extreme values of some critical observables are insensitive to the isospin of the systems. Values of the power law parameter of cluster mass distribution, mean multiplicity of intermediate mass fragments (IMF), information entropy, and Campis second moment also show a minor dependence on the isospin of Xe isotopes at the critical point. In addition, the slopes of the average multiplicities of the neutrons (N-n), protons (N-p), charged particles (N-CP), and IMFs (N-IMF), slopes of the largest fragment mass number (A(max)), and the excitation energy per nucleon of the disassembling source (E*/A) to temperature are investigated as well as variances of the distributions of N-n, N-p, N-CP, N-IMF, A(max), and E*/A. It is found that they can be taken as additional judgements to the critical phenomena. [S0556-2813(99)302108-1].
EPL | 2011
Dd Han; Jh Qian; Yanwei Ma
We introduce a stochastic model to explain a double power-law distribution which exhibits two different Paretian behaviors in the upper and the lower tail and widely exists in social and economic systems. The model incorporates fitness consideration and noise fluctuation. We find that if the number of variables (e.g. the degree of nodes in complex networks or peoples incomes) grows exponentially, normal distributed fitness coupled with exponentially increasing variable is responsible for the emergence of the double power-law distribution. Fluctuations do not change the result qualitatively but contribute to the second-part scaling exponent. The evolution of Chinese airline network is taken as an example to show a nice agreement with our stochastic model.
EPL | 2012
Jh Qian; Dd Han; YG(马余刚) Ma
This letter studies the critical point as well as the discontinuity of a class of explosive site percolation in Erdos and Renyi (ER) random network. The class of the percolation is implemented by introducing a best-of-m rule. Two major results are found: i) For any specific m, the critical percolation point scales with the average degree of the network while its exponent associated with m is bounded by -1 and similar to-0.5. ii) Discontinuous percolation could occur on sparse networks if and only if m approaches infinite. These results not only generalize some conclusions of ordinary percolation but also provide new insights into the network robustness. Copyright (C) EPLA, 2012
Physica A-statistical Mechanics and Its Applications | 2012
Jiang-Hai Qian; Cheng-Hao Yang; Dd Han; Yu-Gang Ma
The distribution of facilities is closely related to our social economic activities. Recent studies have reported a scaling relation between population and facility density, with the exponent depending on the type of facility. In this paper, we show that generally this exponent is not universal for a specific type of facility. Instead, by using Chinese data, we find that it increases with per capita gross domestic product (GDP). Thus our observed scaling law is actually a mixture of several multi-scaling relations. This result indicates that facilities may change their public or commercial attributes according to the outside environment. We argue that this phenomenon results from an unbalanced regional economic level, and suggest a modification of a previous model by introducing the consuming capacity. The modified model reproduces most of our observed properties.
Physica A-statistical Mechanics and Its Applications | 2009
Dd Han; Jiang-Hai Qian; Jin-Gao Liu
Physica A-statistical Mechanics and Its Applications | 2009
Jiang-Hai Qian; Dd Han
arXiv: Physics and Society | 2007
Dd Han; Jiang-Hai Qian; J. G. Liu
Physica A-statistical Mechanics and Its Applications | 2018
Ziqiao Zhang; Peng Pu; Dd Han; Ming Tang
Archive | 2001
HY(张虎勇) Zhang; YG(马余刚) Ma; LP(余礼平) Yu; WQ(沈文庆) Shen; X. Cai; DQ(方德清) Fang; C(钟晨同) Zhong; Dd Han
High Energh Physics and Nuclear Physics | 2001
HY(张虎勇) Zhang; YG(马余刚) Ma; LP(余礼平) Yu; WQ(沈文庆) Shen; X. Cai; DQ(方德清) Fang; PY(胡鹏云) Hu; C(钟晨) Zhong; Dd Han