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El COVID-19 y los niños - Colmédica The other end of each rods is free and has a permanent magnet D (NS) attached, being present a fixed structure F that, at due distance from said magnets D, holds in place other permanent magnets E or electro-magnets, with inverted magnetic polarities (SN) respective to said permanent magnets D at the end of the piezoelectric element on every rod.

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In a further alternative embodiment of the bistable piezoelectric generator, said at least one piezoelectric element may have one end fixed at a base and a permanent magnet at the other end, a fixed structure present, that at due distance from the said magnet, holds in place another permanent magnet or an electro-magnet, with inverted magnetic polarities respective to said permanent magnet at the end of the piezoelectric element.

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Such devices require just a limited amount of electric power during their operation, allowing the use of power micro-generators as an alternative to traditional batteries. Such structures are capable of exploiting the environment’s energy only in a narrow frequency band close to their resonant frequency because, for geometrical reasons, they oscillate mainly at their resonant frequency. Referring to FIG. 3, a possible alternative embodiment of the bistable piezoelectric generator is shown wherein a series of tiny rods B, whose shapes are each approximately that of a parallelepiped, made of piezoelectric material, are placed close to each other and are held in place in a fixed base A at one end. Referring to FIG. 4, a third possible embodiment of the bistable piezoelectric generator, according to the invention, wherein a series of tiny rods B, whose shapes are each approximately that of a parallelepiped, made of piezoelectric material, are placed close to each other and are held in place in a fixed base A at one end.

Referring to FIG. 2, a tiny rod B whose shape is approximately that of a parallelepiped, made of piezoelectric material, is held in place in a fixed base at one end A, while the other end is free with a mass C attached which slightly bends the rod with its weight. Referring to FIG. 5, a fourth possible embodiment of the bistable piezoelectric generator is shown, wherein a tiny rod B, whose shape is approximately that of a parallelepiped, made of piezoelectric material, has each end connected to a rigid and fixed structure A, A′ in such a way that the rod is slightly bended on one side.

The other end of each rod is free with a mass C attached to each that slightly bends the rods B with its weight. According to the invention, the generator can be realized with a plurality of piezoelectric elements, all with one end fixed at a base and having at the other end a permanent magnet. Such devices convert the energy present in the environment into electric energy that can be used to power electronic micro devices. SUMMARY The solution proposed in the present invention provides an electric power generator based on the conversion of mechanical energy into electric energy obtained from the bistable motion of elements of piezoelectric material. According to the invention, said bistable piezoelectric generator is based on the exploitation of the bistable oscillations of the dynamical system composed of the piezoelectric elements.

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More specifically, the invention concerns an electric power generator based on the conversion of mechanical energy into electric energy through the bistable oscillations of elements of piezoelectric material. Based on these premises, the Applicant has realized a Bistable piezoelectric generator that is capable of overcoming the above mentioned limitations of linear piezoelectric generators. The whole of these magnets/electromagnets E is attached to the fixed structure F that is fixed rigidly to the base A. The force between the magnets D (or between these and the electromagnets E) induces the partial bending of each rod B. Vibrations and/or oscillations induced in the base A produce the oscillation of the masses (in this case the magnets D) attached to the free end of the rod B, making them widely move between one equilibrium position 1 and the other opposite equilibrium position 2 in a truly bistable motion.

According to the invention, the generator can be realized with a plurality of piezoelectric elements, all with one end fixed at the same or separate bases, and each of them with a separate or the same mass fixed at the other end. This realization of the bistable piezoelectric generator can be made with an arbitrary number of piezoelectric rods B connected each other in a way analogous to that of FIG. The specific object of the present invention is a bistable piezoelectric generator comprising at least one element in piezoelectric material, with at least one end fixed at a base and having the other end with a mass capable of making oscillations between two distinct positions, respectively a first equilibrium position and a second position opposed to the first. In the past, a number of devices aimed at the same purposes of the present invention have been proposed. Ejercicios para dolor de cuello hombros y espalda . Although preferred embodiments of the present invention have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention.

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In the preferred embodiment of the bistable piezoelectric generator, the mass is fixed at one end of said element of piezoelectric material opposed to the end fixed at the base. Possibly, according to the invention, said piezoelectric element is at least one rod or bar whose shape is approximately a parallelepiped. The response function of a mechanical structure, like the piezoelectric rod B, determines what fraction of the energy provided by the environment is transferred to the mechanical structure. Far from this frequency, the amount of energy transferred to the structure decreases rapidly and approximates to zero for frequencies of the order of two or three (or one half, one third) of the resonant frequency. 4. This potential is characterized by two parameters, a and b, whose value can be varied at will.

On the other hand, a bistable oscillator is a nonlinear oscillating system that, unlike a linear system, admits two equilibrium positions (see graph in FIG. Consider a dynamic system made by an oscillator with a bistable potential energy function (see FIG. In this case the electric potential differences are collected and transformed by an electronic circuit in a suitable form for the powering of electric and/or electronic devices. The at least one element being subjected to nonlinear bistable oscillations, the kinetic energy of such bistable oscillations being converted into electric energy and transformed through an electronic circuit in a suitable form for the powering of electric and/or electronic devices. The fundamentals of the bistable piezoelectric generator, according to the invention, is the principle of conversion of mechanical energy into electric energy through the piezoelectric effect.

It is well known that piezoelectric generators are commonly used in a number of fields of human activity in order to provide electric currents by means of mechanical energy conversion. Such an area is proportional to the electric power produced by the piezoelectric generator. The electric current thus generated can be usefully employed for powering electronic devices. 6), one can go from the monostable potential configuration (quasi-linear, resonant case) for a0.

The repeated bending of the piezoelectric rods B produces at their terminal an electric potential difference V1, V2,. The main limitation of the existing devices, however, is their intrinsic inability to exploit the whole spectrum of energy available. This is due to the fact that their functioning principle unavoidably selects just a small portion of the whole energy spectrum. Mucho dolor de espalda baja . DESCRIPTION By looking at the figures of the attached drawings, it is evident how the electric power generator can assume different geometric configurations all based on the very same invention principle of exploitation of the bistable oscillations of a dynamical system. Examples can be found in the following U.S. Pat. No. 4,504,761 by C G. Triplett; 5,512,795 by Michael Y. Epstein et al; U.S. Pat. No. Dolor en el cartilago de la rodilla . 6,407,484 by John R. Oliver et al; U.S. Pat. No. 4,510,484 by D. S. Snyder; U.S.

Pat. No. 4,467,236 by Henry H. Kolm and Eric A. Kolm; U.S. All features disclosed in this specification, including any accompanying claims, abstract, and drawings, may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features. The function S(f) describes the behavior of a generic dynamic system under the effect of an external force. If it can be imagined that the external force is made by environmental vibrations that give mechanical energy to the piezoelectric generator, then the efficiency of the generator can be measured by the area under the curve of S(f) as a function of f. The area under the curve S(f) (i.e.