Basic Equations for Wave Processes in Fluids and Solids

FERROMAGNETS AND KELVIN'S MEDIUM: BASIC EQUATIONS AND WAVE PROCESSES

Journal of Computational Acoustics ◽

10.1142/s0218396x01000693 ◽

2001 ◽

Vol 09 (02) ◽

pp. 427-446 ◽

Cited By ~ 5

Author(s):

ELENA F. GREKOVA

Keyword(s):

Constitutive Equations ◽

Point Of View ◽

Wave Processes ◽

Polar Medium ◽

Basic Equations ◽

Nonlinear Elastic

The nonlinear constitutive equations of Kelvin's medium (a nonlinear elastic polar medium consisting of rotating particles) are obtained. We establish the analogy between basic equations of saturated elastic ferromagnetic insulators and basic equations of Kelvin's medium. The most general way of taking the couplings of magnetic and elastic subsystems into account is suggested. Wave processes are investigated from this point of view. All results are interpreted both in terms of mechanical medium and ferromagnets.

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FURTHER CONSIDERATIONS ON THE CALCULATIONS OF SECRETION RATES. A CORRECTION

Acta Endocrinologica ◽

10.1530/acta.0.0380469 ◽

1961 ◽

Vol 38 (3) ◽

pp. 469-472 ◽

Cited By ~ 14

Author(s):

K. R. Laumas ◽

J. F. Tait ◽

S. A. S. Tait

Keyword(s):

Steady State ◽

Compartmental Model ◽

Single Injection ◽

Previous Treatment ◽

Urinary Metabolite ◽

Theoretical Treatment ◽

Basic Equations ◽

Special Circumstances ◽

Secretion Rates

ABSTRACT Reconsideration of the question of the validity of the calculations of the secretion rates from the specificity activity of a urinary metabolite after the single injection of a radioactive hormone has led us to conclude that the basic equations used in a previous theoretical treatment are not generally applicable to the nonisotopic steady state if the radioactive steroid and hormone are introduced into the same compartment. If this is so, in a two compartmental model with metabolism occurring in both pools, it is now shown that the calculation (S = R — τ) is rigorously valid if certain precautions are taken. This is in contrast to the previous treatment which concluded (in certain special circumstances) that the calculation might not be correct. However, if the hormone is secreted in both compartments and the radioactive steroid is injected into only one, then the calculation (S = R — τ) may not be correct in certain circumstances as was previously concluded (Laumas et al. 1961).

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