1,721,281 research outputs found
La risposta del pomodoro da industria a densità d'investimento crescenti con raccolta unica del prodotto
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Resa e calendario di raccolta del pomodoro da industria in rapporto alle cultivar, ai metodi ed all'epoca d'impianto
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Alcuni risultati nella dinamica dei solidi elastici inestensibili
No full textIn this paper the Authors first formulate a very general mixed boundary-value problem for dynamics of inextensible elastic solids and they establish for this problem a theorem of uniqueness of solution in bounded and unbounded domains. Then they consider displacement boundary-value problem for which they obtain another theorem of uniqueness of solution. At last the Authors establish a reciprocal theorem for bounded and unbounded domains. © 1980 Università degli Studi di Ferrara
General analysis of discontinuity waves in thermoviscoelastic solids of integral type
No full textIn this paper we study the propagation of general discontinuity waves of order N≥1 through a homogeneous anisotropic linear thermoviscoelastic solid whose heat flux vector depends upon the past history of the temperature gradient. After determining the normal speeds of propagation we state the evolution law of the discontinuities along the rays associated with the wave front. The results are independent of N. © 1991 Società Italiana di Fisica
Stationary magnetic flow of a second grade fluid past a rotating plane: exact solutions
No full textExact solutions are given for the steady flow of
a second grade fluid occupying the halfspace S past the
plane z=0 uniformly rotating about a fixed normal axis (z-axis). No conditions on the sign of the material parameters
characterizing the second grade fluid are imposed. The solutions
are obtained in a velocity field of the form considered by Berker. Then a uniform magnetic field H_0 orthogonal to the (electrically non conducting) rotating plane is impressed. The induced magnetic field is supposed depending only on z. The results are compared with those corresponding to the
Newtonian case and some numerical simulations are given
Flow and stability of a micropolar fluid past a rotating plane
No full textAn exact solution is given for the steady flow of
a micropolar fluid occupying the halfspace past the plane z=0
uniformly rotating about a fixed normal axis (z-axis).
This solution is obtained in a velocity field of the form
considered by Berker and supposing the microrotation
depending only on z. The stability of this flow is then studied
using the energy method. The results are compared with those
corresponding to the Newtonian case and can be deduced as a
limiting case, as h tends to infinity, of the solution to the problem
relative to the strip of width h
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