  The energy dependence of various particle ratios is calculated within the
Ultra-Relativistic Quantum Molecular Dynamics approach and compared with the
hadron resonance gas (HRG) model and measurements from various experiments,
including RHIC-BES, SPS and AGS. It is found that the UrQMD particle ratios
agree well with the experimental results at the RHIC-BES energies. Thus, we
have utilized UrQMD in simulating particle ratios at other beam energies down
to 3 GeV, which will be accessed at NICA and FAIR future facilities. We observe
that the particle ratios for crossover and first-order phase transition,
implemented in the hybrid UrQMD v3.4, are nearly indistinguishable, especially
at low energies (at large baryon chemical potentials or high density).
