this study was conducted to compare susceptibility of six different strains of male broilers to ascites syndrome. in this experiment, 612 one-day-old male broiler chicks from five international hybrids (e.g, arbor acres, cobb 500, hubbard, lohmann, and ross 508) and an iranian hybrid (arian) were used. growth performance, ascites mortality ratio, the ratio of right ventricle to total ventricles...

The zero-temperature transition from a paramagnetic metal to a paramagnetic insulator is investigated in the dynamical mean field theory for the Hubbard model. The self-energy of the effective impurity Anderson model (on which the Hubbard model is mapped) is calculated using Wilson’s numerical renormalization group method. Results for the quasiparticle weight, the spectral function, and the sel...

The Hohenberg–Kohn (HK) theorem for interacting electrons is a cornerstone of modern electronic structure calculations. For general quantum system, HK-type Hamiltonian in the form H ̂ hk { g i } = int + ∑ O $\hat {H}_{\rm hk}\lbrace g_i\rbrace =\hat int}+\sum_i g_i \hat O_i$ can always be defined, by grouping those terms with fixed or preknown coefficients into an internal part int}$ , and facto...

We propose the mechanism for the magnetic field induced AFM state in a two-dimensional Hubbard model in the vicinity of the antiferromagnetic (AFM) quantum critical point (QCP), using the fluctuation-exchange (FLEX) approximation by taking the Zeeman energy due to magnetic field B into account. In the vicinity of the QCP, we find that the AFM correlation perpendicular to B is enhanced, whereas ...

Dynamics of charge density and lattice displacements after the neutral phase is photoexcited is studied by solving the time-dependent Schrödinger equation for a one-dimensional extended Peierls-Hubbard model with alternating potentials. In contrast to the ionic-toneutral transition studied previously, the neutral-to-ionic transition proceeds in an uncooperative manner as far as the one-dimensio...

Doping induced metal-insulator transition in two-dimensional Hubbard, t − U , and extended Hubbard, t − U − W , models. Abstract We show numerically that the nature of the doping induced metal-insulator transition in the two-dimensional Hubbard model is radically altered by the inclusion of a term, W , which depends upon a square of a single-particle nearest-neighbor hopping. This result is rea...

We consider the Kane-Mele model supplemented by a Hubbard U term. The phase diagram is mapped out using projective auxiliary field quantum Monte Carlo simulations. The quantum spin liquid of the Hubbard model is robust against weak spin-orbit interaction, and is not adiabatically connected to the spin-Hall insulating state. Beyond a critical value of U>U(c) both states are unstable toward magne...

Hubbard ladders are an important stepping stone to the physics of the two-dimensional Hubbard model. While many of their properties are accessible to numerical and analytical techniques, the question of whether weakly hole-doped Hubbard ladders are dominated by superconducting or charge-density-wave correlations has so far eluded a definitive answer. In particular, previous numerical simulation...

The new method of investigation of strongly correlated electronic system is presented. Using this method we have derived the superstring from 2D Hubbard model. The novel expression for generalized supercoherent state has been calculated. 1. Nowadays the Hubbard model attracts considerable attention. This model is incorporated in several profound theoretical projects, proposed in [1] for example...