OBSTETRIC GYNECOLOGICAL SOCIETY IN BERLIN Meeting December 11, 1891

Brse demonstrated a new vaginal electrode that he made for such electrical applications where one wishes to take advantage of the pole-to-pole current. The electrode consists of a clay cylinder with a circumference of 9 cm, which is inserted into the vagina in exactly the same way as a tubular mirror. In this clay cylinder is placed a metal cylinder, equipped with numerous holes, which has a screw at its outer end to strengthen the conductor. After the introduction of the clay cylinder, a metal cylinder is inserted into the vagina, and the clay tube is filled with warm water. The wet clay cylinder is an excellent conductor of current and replaces the skin electrode made from a sponge. If this cylinder is inserted into the vagina for a length of 8-10 cm, then with a circumference of 9 cm, it will correspond to a flat electrode of 72-90 sq. Cm. This electrode is intended for use where one wants to concentrate the current density in more than one place of the vagina. but evenly distribute the current over the pelvic organs. It is used more where, when using strong galvanic currents, they want to avoid the cauterizing effect on the vaginal mucosa, which easily occurs when spherical electrodes are used, despite being wrapped in cotton wool. Finally, it is used where one wants to obtain an interpolar (so-called catalytic) effect. The patient, when using this electrode, tolerates perfectly well currents of 80-100 MA, while cauterization of the vaginal mucosa is not obtained.

The Synthesis Model of Flat-Electrode Hemispherical Resonator Gyro

The Hemispherical Resonator Gyro (HRG) is a solid-state and widely used vibrating gyroscope, especially in the field of deep space exploration. The flat-electrode HRG is a new promising type of gyroscope with simpler structure that is easier to be fabricated. In this paper, to cover the shortage of a classical generalized Coriolis Vibration Gyroscope model whose parameters are hard to obtain, the model of flat-electrode HRG is established by the equivalent mechanical model, the motion equations of unideal hemispherical shell resonator are deduced, and the calculation results of parameters in the equations are verified to be reliable and believable by comparing with finite element simulation and the reported experimental data. In order to more truthfully reveal the input and output characteristics of HRG, the excitation and detection models with assemble errors and parameters are established based on the model of flat-electrode capacitor, and they convert both the input and output forms of the HRG model to voltage changes across the electrodes rather than changes in force and capacitance. An identification method of assemble errors and parameters is proposed to evaluate and improve the HRG manufacturing technology and adjust the performance of HRG. The average gap could be identified with the average capacitance of all excitation and detection capacitors; fitting the approximate static capacitor model could identify the inclination angle and direction angle. With the obtained model, a firm and tight connection between the real HRG system and theoretical model is established, which makes it possible to build a fully functional simulation model to study the control and detection methods of standing wave on hemispherical shell resonator.