Ferrite Matrix

Ferrite Matrix

 

a component of a computer memory unit, in the form of a rectangular frame of insulating material within which are placed ferrite cores threaded by insulated wires. The wires are connected to lead-out contacts in one or two rows along the sides of the frame. The frame may consist of two parts: one for the placement of the address-decoding elements of the memory cells (transistors, pulse transformers, semiconductor diodes, and resistors) and one for the memory elements, or ferrite cores, which may number as many as several tens of thousands in a single matrix.

The arrangement of cores and wires in a ferrite matrix depends on the organization of the access (the scanning for a required cell) and the information reading and writing operations. When a ferrite matrix is designed, particular attention is given to reducing the electrical interference created in the wires by the presence of inductive and capacitive couplings. In order to reduce or compensate the interference, the writing and reading wires or windings may be grouped in sections or laid out according to a specially developed plan. Two, three, or four wires may be threaded through the cores, depending on the organization adopted for the access.

The principal requirements imposed on a ferrite matrix are minimum reactances in the access, writing, and reading windings in order to shorten the signal transmission time within the windings; maximum reliability for the contacts, soldered connections, insulation (especially where wires intersect), and cores; interchangeability; and the possibility of threading the cores automatically.

A. V. GUSEV

References in periodicals archive ?
The optical and SEM microstructures of the as-received DI shown in Figure 6(a, b) consist of graphite nodules surrounded by ferrite matrix. The average graphite nodularity is approximately 90%, the average nodule size (r) is 18.43 [micro]m and there are 130 nodules per unit area ([mm.sup.2]).
Therefore, the residual austenite transformed into the retained austenite or M-A island that was distributed within the ferrite matrix. Subsequently, the lath and granular bainite microstructures were generated [16,17].
Therefore, the residual austenite transforms into the M-A island that is distributed within the ferrite matrix. Subsequently, the lath and granular bainite microstructures are generated.
4) and then it revealed a considerable amount of pearlite in ferrite matrix (sample 5 as shown in Fig.
The as-received material contains surplus arrays of coarse large carbides with smaller carbides distributed homogeneously in a ferrite matrix parallel to the working direction, as shown in Figure 3.
Dual-phase steels are alloys with low carbon content and a structure consisting of a soft and tough ferrite matrix (75 / 85 %) in which one can find homogeneously dispersed martensite and a small amount of residual austenite and lower bainite.
The gray iron specimens had both Type A and D graphite flakes with either pearlite or ferrite matrix structures (Figs.
The S15C material had a hardness of 65 HRB and a microstructure of ferrite matrix and approximately 20 percent pearlite.
Consequently, the microstructure of the HTHAZ closest to the weld interface consists of ferrite matrix surrounded by a network of grain boundary martensite.
The ferrite matrix around graphite nodules produces a negative influence on the mechanical properties: it reduces hardness and strength of the structure.
Above the austenitization temperature of 900[degrees]C, the microstructure contained more globular bainite rather than the lath bainite typical for lower austenitization temperatures and the bainite microstructure is much finer and more uniformly distributed throughout the ferrite matrix. Prolonging the holding times at lower austenitization temperatures leads to the formation of lath bainite as well.
The pearlite is not the typical laminar structure but more like spherical carbide in a ferrite matrix at the grain boundaries.