Abstract: A method of calibrating a resonator having a resonant member that can vibrate in a first mode of vibration, and a calibration electrode that is spaced from a capacitively coupled to the resonant member, the method comprises: applying a polarization voltage to the resonant member and a calibration voltage to the calibration electrode, wherein the polarization voltage is a negative voltage; vibrating the resonant member such that the resonant member vibrates in the first mode of vibration; measuring a frequency parameter of the resonant member; determining if the frequency parameter is in compliance with a predetermined threshold; and if the frequency parameter is not in compliance with the predetermined threshold, adjusting the frequency parameter to be in compliance with the predetermined threshold by adjusting at least one of the polarization voltage and the calibration voltage.

Abstract: A method of calibrating a resonator having a resonant member that can vibrate in a first mode of vibration, and a calibration electrode that is spaced from a capacitively coupled to the resonant member, the method comprises: applying a polarization voltage to the resonant member and a calibration voltage to the calibration electrode, wherein the polarization voltage is a negative voltage; vibrating the resonant member such that the resonant member vibrates in the first mode of vibration; measuring a frequency parameter of the resonant member; determining if the frequency parameter is in compliance with a predetermined threshold; and if the frequency parameter is not in compliance with the predetermined threshold, adjusting the frequency parameter to be in compliance with the predetermined threshold by adjusting at least one of the polarization voltage and the calibration voltage.

Abstract: A Hand Tool for Removing Nopal-Cactus Thorns is similar in shape to a spoon. This hand tool has a Hole shaped as a polygonal star in its head with a narrow area surrounding that hole for removing the skin and the superficial Thorns of the Nopal Petal by repeatedly rubbing the utensil against the surface of the Petal in a longitudinal fashion, without need of sharpening the edge of the Hole. A Secondary Hole for removing the hardest Thorns and those in the edges and corners of the Nopal Petals and a Corner Blade for cutting it in small squares or small stripes are also present in the tool.