The phrase "and the second model" is correct and usable in written English.
It can be used when referring to a second model in a comparison or discussion of multiple models.
Example: "We have analyzed the first model thoroughly, and the second model shows even more promising results."
Alternatives: "as for the second model" or "regarding the second model".
The first model estimates shear strength, and the second model systematically provides conservative estimation.
The first is an approximate model with bounds on its uncertainty, and the second model is updated by statistical methods.
The first model (M1) estimated divergence using a stepwise model of population size change, and the second model (M2) estimated exponential population size changes in the polyploid and diploids.
Two models were tested: the first depicted depressive or anxiety symptoms predicting BMI, and the second model depicted BMI predicting depressive or anxiety symptoms.
The first model involved competitive adsorption between hydrogen and organic compound and the second model was based on non-competitive adsorption.
The first model is based on a linear thin-shell theory and the second model uses a self-programmed finite element program with planar elements.
The first model refers to the initial monument's stage till its current stage and the second model refers to its current stage till the restoration proposal.
The first RSM is constructed by 32 CFD models via Fractional Factorial Design FFDD) and the second model is constructed by 53 CFD models via Central Composite Rotatable Design (CCRD).
In this work, we develop 2 different ANN models; the first ANN model based on 3 inputs (F, T, P) and the second model based on 2 inputs (T and P).
We stabilized two structures of TiO2 using a simulated annealing procedure with Molecular Dynamics as a first approach and the second model was optimized at the PBE level of theory, as benchmarking.
The first inflow model includes the coupling between the air-feed system and the fluidized bed in the simulation, and the second model assumes a constant mass flow of gas into the fluidized bed.
