No description available.

Thesis (Ph. D.)--Ohio University, November, 1980. / Title from PDF t.p.

Negative feedback can be applied to an electromagnetic seismometer through the coil terminals using a Maxwell impedance bridge to bypass the coil impedance. The application of feedback by this method obviates the need for a second transducer, and permits direct calibration of the feedback seismometer. Feedback of a simulated ground acceleration proportional to the acceleration of the suspended mass effectively increases the mass, lengthening the natural period of the seismometer. Displacement feedback effectively stiffens the spring, decreasing the resonant period, while the seismometer damping can be increased with velocity feedback. Experimentally determined sensitivity curves obtained with a Willmore Mk.I. seismometer demonstrate the capabilities of negative feedback in altering the response of the seismometer. A resonant period of 17 sec. corresponding to an equivalent suspended mass of 1230 kg. is readily obtained. A discussion of instrument noise in the feedback seismometer is included. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

No description available.

Thesis (M.S. in E.E.)--School of Electrical and Computer Engineering, Georgia Institute of Technology, 2004. Directed by David V. Anderson. / Includes bibliographical references (leaves 55-56).

No description available.

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 66-68.

The purpose of this research is to test a unique implementation of active feedback applied to a low frequency piezoelectric transducer. Understanding that active feedback can be used to shape the frequency response of an electrical system a method for applying active electroacoustical feedback will be used to obtain a wider acoustical bandwidth in a piezoelectric transmitter. By applying active feedback to a resonant device its bandwidth was increased by a factor of 2.5. This is a significant improvement for applications where minimum electrical phase shift versus frequency is desired.

S.J. Mason. / "July 20, 1955." "Reprinted from the Proceedings of the I.R.E., v.44, no.7, July, 1956." / Includes bibliographical references. / Army Signal Corps Contract DA36-039 sc-64637. Project 102B. Dept. of the Army Project 3-99-10-022

Samuel J. Mason. / I. Some properties of signal flow graphs. / Issued also as a thesis, M.I.T. Dept. of Electrical Engineering, 1951. / Army Signal Corps Contract DA36-039-sc-100. Dept. of the Army Project 3-99-10-022.