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Search Results: 1 - 10 of 92722 matches for " LIU Chun "
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Multi-Objective Optimization for Active Disturbance Rejection Control for the ALSTOM Benchmark Problem  [PDF]
Chun’e Huang, Zhongli Liu
International Journal of Clean Coal and Energy (IJCCE) , 2015, DOI: 10.4236/ijcce.2015.43006
Abstract: Based on a thing that it is difficult to choose the parameters of active disturbance rejection control for the non-linear ALSTOM gasifier, multi-objective optimization algorithm is applied in the choose of parameters. Simulation results show that performance tests in load change and coal quality change achieve better dynamic responses and larger scales of rejecting coal quality disturbances. The study provides an alternative to choose parameters for other control schemes of the ALSTOM gasifier.
Baryonium, tetra-quark state and glue-ball in large N_c QCD
Liu, Chun
High Energy Physics - Phenomenology , 2007, DOI: 10.1140/epjc/s10052-007-0471-8
Abstract: From the large-N_c QCD point of view, baryonia, tetra-quark states, hybrids, and glueballs are studied. The existence of these states is argued for. They are constructed from baryons. In N_f=1 large N_c QCD, a baryonium is always identical to a glueball with N_c valence gluons. The ground state 0^{-+} glueball has a mass about 2450 MeV. f_0(1710) is identified as the lowest 0^{++} glueball. The lowest four-quark nonet should be f_0(1370), a_0(1450), K^*_0(1430) and f_0(1500). Combining with the heavy quark effective theory, spectra of heavy baryonia and heavy tetra-quark states are predicted. 1/N_c corrections are discussed.
Phenomenology of A Supersymmetric Model for Fermion Mass Hierarchy
Chun Liu
Physics , 1996, DOI: 10.1142/S0217732397000339
Abstract: Some phenomenological aspects of a supersymmetric model for fermion mass hierarchy proposed previously are discussed. It is required that the lepton universality violation is near to its current experimental bound. The lepton number violation decay modes $\tau \to 2e\mu$ and $3\mu$ maybe observable in the near future. The Majorana mass of electron-neutrino is predicted to be about 0.1 eV. The fine-tuning problem is discussed.
Quark Mass Hierarchy and CP Violation in Low Energy Supersymmetry
Chun Liu
Physics , 1995, DOI: 10.1142/S0217751X96002005
Abstract: A pattern of quark mass hierarchy and CP violation within the framework of low energy supersymmetry is described. By assuming some discrete symmetry among the three families, the quarks of the third family obtain masses at tree level. The second family obtains masses radiatively at one-loop level due to the soft breaking of the family symmetry. At this level, the first family remains massless by some degeneracy conditions of the squarks. As a result of R-parity violation, the sneutrino vacuum expectation values are nonvanishing. CP violation occurs through the superweak sneutrino exchange. This picture is consistent with the experiments on the flavor changing neutral current.
Heavy Baryon Masses in Large N_c HQET
Chun Liu
Physics , 1996, DOI: 10.1016/S0370-2693(96)01269-5
Abstract: We argue that in the large N_c HQET, the masses of the s-wave low-spin heavy baryons equal to the heavy quark mass plus proton mass approximately. To the subleading order, the heavy baryon mass 1/N_c expansion not only has the same form, but also has the same coefficients as that of the light baryon. Based on this, numerical analysis is made.
1/N_c Expansion of the Heavy Baryon Isgur-Wise Functions
Chun Liu
Physics , 1997, DOI: 10.1103/PhysRevD.57.1991
Abstract: The 1/N_c expansion of the heavy baryon Isgur-Wise functions is discussed. Because of the contracted SU(2N_f) light quark spin-flavor symmetry, the universality relations among the Isgur-Wise functions of \Lambda_b to \Lambda_c and \Sigma_b^{(*)} to \Sigma_c^{(*)} are valid up to the order of 1/N_c^2.
Topcolor-Assisted Supersymmetry
Chun Liu
Physics , 1999, DOI: 10.1103/PhysRevD.61.115001
Abstract: It has been known that the supersymmetric flavor changing neutral current problem can be avoided if the squarks take the following mass pattern, namely the first two generations with the same chirality are degenerate with masses around the weak scale, while the third generation is very heavy. We realize this scenario through the supersymmetric extension of a topcolor model with gauge mediated supersymmetry breaking.
Supersymmetry for Flavors
Chun Liu
Physics , 2000,
Abstract: An understanding of the lepton masses within the framework of SUSY is presented. A family symmetry is introduced. Sneutrino VEV breaks this symmetry. The tau mass is due to the Higgs VEV, and muon mass purely from the sneutrino VEV. A viable model is constructed, which predicts (1-10) MeV tau-neutrino.
Some Remarks on the Baryon-Meson Couplings in the 1/N_c Expansion
Chun Liu
Physics , 1997, DOI: 10.1007/s100520050176
Abstract: The original results for the baryon-pion couplings in the large $N_c$ QCD can be understood in a simpler way in the Hartree-Fock picture. The large $N_c$ relation and its $1/N_c$ correction between the heavy baryon-meson coupling and the light baryon-meson coupling are emphasized. Application to the baryon-$\rho$ meson interactions is straightforward. The implications of recent experimental result for the strong coupling constants of the heavy baryon chiral lagrangian are discussed.
Excited Heavy Mesons from QCD Sum Rules
Chun Liu
Physics , 1998,
Abstract: Orbitally excited L=1 charm mesons are studied by QCD sum rules in the framework of heavy quark effective theory. The meson masses and the strong decay widths are obtained. This talk is based on our works of refs. 1 and 2 collaborated with Y.B. Dai, C.S. Huang, M.Q. Huang and H.Y. Jin.
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