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abstract in this research, a radial basis function artificial neural network (rbf-ann) model was developed to predict the hot deformation flow curves of api x65 pipeline steel. the results of the developed model was compared with the results of a new phenomenological model that has recently been developed based on a power function of zener-hollomon parameter and a third order polynomial functio...

this qualitative study was conducted to identify the factors and barriers of entrepreneurship development from the perspective of iranian entrepreneurs. in terms of purpose, this study is applied- developmental and it is performed via descriptive phenomenological method. qualitative content analysis was used to collect the data. the study population comprised of recorded interviews with the ent...

The spectroscopic characteristics for a single-molecule in the vicinity of a metallic structure are studied as a function of the substrate temperature via a phenomenological model. Emphasis is put on the role of the surface plasmon excitation of the structure and its variation with the change of temperature. From the emission characteristics such as the decay rates and frequency-shifts of the m...

Using first principles, it is demonstrated that radiative damping alone cannot lead to a nonvanishing electro-optic effect in a chiral isotropic medium. This conclusion is in contrast with that obtained by a calculation in which damping effects are included using the standard phenomenological model. We show that these predictions differ because the phenomenological damping equations are valid o...

Stimulated by the experimental observation, made by the E760 Collaboration at Fermilab, of the P1 state of charmonium resonantly formed in p p̄ annihilation, we perform a calculation of the decay width for the P1 → p p̄ process. To this end, we employ a phenomenological model which adds constituent quark mass corrections to the usual massless QCD models for exclusive processes. For massless model...

We present a simple and self-consistent cosmology with a phenomenological model of quantum creation of radiation and matter due to decay of the cosmological constant Λ. The decay drives a non-isentropic inflationary epoch, which exits smoothly to the radiation-dominated era, without reheating, and then evolves to the dust era. The initial vacuum for radiation and matter is a regular Minkowski v...

It is commonly known that the intermittent transition from laminar to turbulent flow in pipes occurs because, at intermediate values of a prescribed pressure drop, a purely laminar flow offers too little resistance, but a fully turbulent one offers too much. We propose a phenomenological model of the flow, which is able to explain this in a quantitative way through a hysteretic transition betwe...

The role of strong absorption of particles in intermidiate and final states has been considered. The range of applicability of phenomenological model of absorption has been studied. This model is nonuniversal. Its applicability depends on the type of interaction Hamiltonian and matrix element used. We also demonstrate that the violation of the unitarity condition can produce a qualitative error...

We present a simple and thermodynamically consistent cosmology with a phenomenological model of quantum creation of radiation due to vacuum decay. Thermodynamics and Einstein’s equations lead to an equation in which H is determined by the particle number N . The model is completed by specifying the particle creation rate Γ = Ṅ/N , which leads to a second-order evolution equation for H . We prop...