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- Emanuele Lindo Secco, Luca Valandro, Roberto Caimmi, Giovanni Magenes, Benedetto Salvato
- Biological Cybernetics
- 2005

The fossil record of early hominids suggests that their Arm length, and presumably stature and weight, had a tendency to increase. Using the minimum jerk principle and a related formulation of averaged specific power, ASP, with regard to selected two-joint Arm movements, the current paper explores relationships between ASP, hand trajectory length (or Arm… (More)

- Luca Valandro, Benedeto Salvato, Roberto Caimmi, Lauro Galzigna
- Journal of theoretical biology
- 2000

Population dynamics of tRNA-like macromolecules and viruses have been interpreted by Eigen (1971, Naturwissenschaften58, 465-526) on the basis of the "quasispecies" model. The present paper contains a qualitative analysis of the similarities between Eigen's quasispecies model and percolation models. In fact, different phenomena characterized by an analogous… (More)

- Roberto Caimmi, T. Valentinuzzi
- 2008

Two-component, ideal, self-gravitating fluids are conceived as macrogases, and the related equation of state is expressed using the virial theorem for subsystems, under the restriction of homeoidally striated density profiles. Explicit calculations are performed for a useful reference case and a few cases of astrophysical interest, both with and without… (More)

This paper has two parts: one about observational constraints related to the empirical differential oxygen abundance distribution (EDOD), and the other about inhomogeneous models of chemical evolution, in particular the theoretical differential oxygen abundance distribution (TDOD). In the first part, the EDOD is deduced from subsamples related to two… (More)

- Roberto Caimmi
- 2008

The virialization of matter overdensities within dark energy subsystems is considered under a number of restrictive assumptions, namely (i) spherical-symmetric density profiles, (ii) time-independent quintessence equation of state parameter, w, and (iii) nothing but gravitational interaction between dark energy scalar field and matter. In addition, the… (More)

- Roberto Caimmi
- 2008

The tensor virial theorem for subsystems is formulated for threecomponent systems and further effort is devoted to a special case where the inner subsystems and the central region of the outer one are homogeneous, the last surrounded by an isothermal homeoid. The virial equations are explicitly written under the additional restrictions: (i) similar and… (More)

- Roberto Caimmi
- 2008

Simulated dark matter haloes are fitted by self-similar, universal density profiles, where the scaled parameters depend only on a scaled (truncation) radius, Ξ = R/r0, which, in turn, is supposed to be independent on the mass and the formation redshift. The further assumption of a lognormal distribution (for a selected mass bin) of the scaled radius, or… (More)

- Roberto Caimmi
- 2009

Macrogases are defined as two-component, large-scale celestial objects where the subsystems interact only via gravitation. The macrogas equation of state is formulated and compared to the van der Waals (VDW) equation of state for ordinary gases. By analogy, it is assumed that real macroisothermal curves in macrogases occur as real isothermal curves in… (More)

- Roberto Caimmi, Chris Marmo, T. Valentinuzzi
- 2008

Analytical and geometrical properties of generalized power-law (GPL) density profiles are investigated in detail. In particular, a oneto-one correspondence is found between mathematical parameters (a scaling radius, r0, a scaling density, ρ0, and three exponents, α, β, γ), and geometrical parameters (the coordinates of the intersection of the asymptotes, xC… (More)

- Roberto Caimmi
- 2005

The formulation of the tensor virial equations is generalized to unrelaxed configurations, where virial equilibrium does not coincide with dynamical (or hydrostatic) equilibrium. Special classes of homeoidally striated ellipsoids are shown to exhibit similar properties as Jacobi ellipsoids, and reduce to Jacobi ellipsoids in the limiting situation of… (More)