Baltzer, Phillip K.

Scope and Contents MIT DIC 6889. Project Whirlwind Engineering Note E-512. A method for screening the Production Lots of ferrite cores to be tested for MTC is required because of testing limitations and large variations found between Production Lots. It is proposed that a sample of 100 cores be taken from each lot and tested at the factory. The mean of the sample must be between the Screening Limits specified for the lot to be accepted, from the manufacturer, for complete testing. The Per Cent Yield of the...

Scope and Contents Project Whirlwind Memo M-3035. Master's Thesis Proposal: An Investigation of Some Parameters which Influence the Magnetic Characteristics of Ferrites. Recent theories have been advanced concerning the squareness of the hysteresis loop and the dynamics of the magnetic switching mechanism in polycrystalline ferrites. These theories require evaluation. The important parameters of these theories, grain-to-grain alignment of the direction of magnetization, domain-wall energy density, and the...

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo 6M-3215. The eighteen papers which were presented at the conference on ferrimagnetism at the U. S. Naval Ordnance Laboratory, 11-12 October 1954, are summarized. Pertinent discussions are also included.

Scope and Contents MIT DIC 6889. Project Whirlwind Engineering Note E-533. The pulse response of ferrite memory cores, that will be used in M.T.C., has been found as a function of Current Pulse Duration. It has been found that reduction of Current Pulse Duration to 1.5 microseconds is the practical limit for best operation. Calculations made concerning signal discrimination of memory arrays indicate that discrimination of signals from 64 x 64 arrays of M.T.C. cores will be marginal—even using a Post-Write...

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-2275. The equation of motion for a cylindrical domain wall has been derived utilizing the Lagrangian formulation. Additional terms enter the equation of motion for a cylindrical wall that do not appear in that for a planar wall.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-2234. This memo is a summary of a Group 63 seminar on magnetism. Topics include a paper presented at the 1953 Spring meeting of The American Physical Society by C. L. Hogan.

Scope and Contents

MIT DIC 6889. Project Whirlwind Memo M-1926. This memo is a summary of a Group 63 seminar on magnetism. Topics include evaluation of the density of energy states at the top of the Fermi distribution, and binding energies in body-centered transition metals.

Scope and Contents Project Whirlwind Report 6R-236. The development of ceramic materials with an intrinsically square hysteresis loop for use as storage elements in high-speed electronic computers has been largely empirical. A fundamental understanding of the basic mechanism responsible for the square hysteresis loop is necessary for further significant improvements in these materials. The investigation reported in this paper was undertaken to obtain magnetostriction data on a compositional series of ferrites...