Abstract: An elongated web of paper is perforated along a plurality of transverse lines to provide bands of web areas having relatively high tensile strength which extend generally longitudinally along the web. The lines of perforation can be formed by staggered perforation lines which contain groups of perforations which are separated by unperforated areas or by staggered perforation lines which include groups of perforations having relatively low tensile strength which are separated by groups of perforations having relatively high tensile strength.

Abstract: An eddy current probe array is disclosed comprising a plurality of spatially correlated eddy current probe elements sufficiently disposed within a flexible interconnecting structure to collect a discrete plurality of spatially correlated eddy current measurements for nondestructive near surface flaw detection. A plurality of precisely fabricated, substantially identical elements being sufficiently distributed can accommodate inspecting an area of conductor covered by the active width of the array in a single uni-directional scan. The array structure can flexibly conform to accommodate inspection of large, irregular, curved conductive surfaces which cannot be inspected by conventional means.

Abstract: An eddy current device for inspecting a component includes an eddy current array circuit having respective pluralities of drive and sense elements and having an active face for positioning on a surface of the component during the inspection operation. A backing is disposed on a face of the eddy current array circuit opposite to the active face for concentrating an electromagnetic flux from the eddy current array circuit into the component when each of the plurality of drive elements is being energized. A mechanical arrangement is provided for supporting and deploying the backing and the array circuit to substantially conform with the surface portion under inspection and to cause each of the pluralities of drive and sense elements to be maintained at their respective substantially constant distances from the inspection surface during scanning, preferably at a controlled rate of scan.

Abstract: An apparatus for near surface, nondestructive eddy current scanning of a conductive part using a multi-layer eddy current probe array. Such structures of this type, generally, employ an ultra-thin, flexible, film-like, multi-layer eddy current probe array which is adapted to provide routine inspection of conductive parts while also providing improved signal integrity, signal transmission and isolation.

Abstract: A small, high-frequency, high-efficiency inductor includes a segmented toroidal core with a winding wound thereon. The toroidal core has either a solid core structure, a laminated core structure, or a strip-wound core structure that is cut into segments. The segmented toroidal core is made of a relatively high-permeability magnetic material and has a plurality of narrow gaps having a width less than approximately 2% of an average linear dimension across the face of each segment. Nonconductive, nonmagnetic spacers are inserted and bonded in the gaps. The inductor winding preferably comprises litz wire in order to further reduce losses.

Abstract: A dual-permeability magnetic core structure is provided for use in small, high-frequency inductors and transformers. The dual-permeability core encloses a winding window containing planar windings and comprises high-permeability and low-permeability sections positioned to produce a highly uniform, or uniformly varying, magnetic field on the winding surfaces. The dual-permeability core products low winding losses and a low AC-to-DC resistance ratio. Fabrication of the dual-permeability core involves a method of controlling the permeability of a magnetic material and a methd of combining structures of two different permeability values.

Abstract: A composite comprised of a sintered matrix of spinel ferrite and a non-exposed continuous phase of elemental silver or Ag-Pd alloy ranging to 25 atomic % Pd is produced by co-firing a laminated structure of ferrite powder-containing tapes containing non-exposed metallization-forming material. The composite can be formed into a composite product which contains a continuous silver or Ag-Pd alloy phase with two end portions wherein only the end portions are exposed.

Abstract: A composite comprised of a sintered matrix of spinel ferrite and a non-exposed continuous phase of elemental silver or Ag-Pd alloy ranging to 25 atomic % Pd is produced by co-firing a laminated structure of ferrite powder-containing tapes containing non-exposed metallization-forming material. The composite can be formed into a composite product which contains a continuous silver or Ag-Pd alloy phase with two end portions wherein only the end portions are exposed.

Abstract: A composite comprises of a sintered matrix of spinel ferrite and an electrically conductive phase of elemental silver is produced by co-firing a laminated structure of ferrite powder-containing tapes containing a silver metallization-forming material having two end portions wherein only the end portions are exposed.

Abstract: A varistor device comprised of a multi-layer zinc oxide varistor matrix containing metallizations of silver.

Abstract: A dual-permeability magnetic core structure is provided for use in small, high-frequency inductors and transformers. The dual-permeability corer encloses a winding window containing planar windings and comprises high-permeability and low-permeability sections positioned to produce a highly uniform, or uniformly varying, magnetic field on the winding surfaces. The dual-permeability core produces low winding losses and a low AC-to-DC resistance ratio. Fabrication of the dual-permeability core involves a method of controlling the permeability of a magnetic material and a method of combining structures of two different permeability values.

Abstract: A composite comprised of a sintered matrix of spinel ferrite and an electrically conductive phase of elemental silver is produced by co-firing a laminated structure of ferrite powder-containing tapes containing a silver metallization-forming material having two end portions wherein only the end portions are exposed.

Abstract: A process for producing an hermetic feedthrough in a ceramic substrate by providing a sheet of liquid phase sinterable ceramic composition having a feedthrough hole, filling the feedthrough hole with refractory metal metallization material, firing the resulting structure to produce a sintered substrate and adherent metallization wherein the metallization is comprised of continuous phases of refractory metal and glass, contacting the refractory metal with electrically conductive intrusion metal and heating the resulting structure to a temperature at which the glassy phase is fluid, the refractory metal is solid, and the intrusion metal is liquid whereby the liquid metal preferentially wets the refractory metal, migrates into the metallization displacing glass and, upon subsequent solidification, partially or wholly occupies the volume space originally containing the continuous glass phase.

Abstract: A process for producing an hermetic feedthrough in a ceramic substrate by providing a sheet of liquid phase sinterable ceramic composition having a feedthrough hole, filling the feedthrough hole with refractory metal metallization material, firing the resulting structure to produce a sintered substrate and adherent metallization wherein the metallization is comprised of continuous phases of refractory metal and glass, contacting the refractory metal with electrically conductive intrusion metal and heating the resulting structure to a temperature at which the glassy phase is fluid, the refractory metal is solid, and the intrusion metal is liquid whereby the liquid metal preferentially wets the refractory metal, migrates into the metallization displacing glass and, upon subsequent solidification, partially or wholly occupies the volume space originally containing the continuous glass phase.

Abstract: A process for increasing electrical conductance of a metallization on a ceramic substrate wherein the metallization is an intermixture of continuous phases of refractory metal and glass which comprises contacting the refractory metal with an electrically conductive intrusion metal and heating the resulting structure to a temperature at which the glassy phase is fluid, the refractory metal is solid, and the intrusion metal is liquid whereby the liquid metal preferentially wets the refractory metal, migrates into the metallization displacing glass and, upon subsequent solidification, partially or wholly occupies the volume space originally containing the continuous glass phase.

Abstract: A particulate dispersion of .alpha.-alumina, magnesium oxide and an additive selected from the group consisting of zirconium oxide, hafnium oxide and mixtures thereof, is formed into a green body and sintered in hydrogen producing a theoretically dense ceramic with improved optical transmission properties.

Abstract: A core holder for reeling which includes a relatively elongated metal tube and a plastic sleeve fixed on the tube with the sleeve having radially outwardly projecting therefrom a plurality of longitudinally extending ribs, the ribs being grindable to a predetermined radius.

Abstract: A particulate dispersion of silicon nitride and beryllium additive is formed into a green body and sintered at a temperature ranging from about 1900.degree. C. to about 2200.degree. C. in a sintering atmosphere of nitrogen at superatmospheric pressure producing a sintered body with a density ranging from about 80% to about 100%.

Abstract: A core holder for reeling and method of making which includes a relatively elongated plastic tube and a plastic sleeve fixed on the tube with the sleeve having radially outwardly projecting therefrom a plurality of longitudinally extending ribs, the ribs being grindable to a predetermined radius.

Abstract: A particulate dispersion of silicon nitride, magnesium additive and beryllium additive is formed into a green body and sintered at a temperature ranging from about 1800.degree. C to about 2200.degree. C in a sintering atmosphere of nitrogen at superatmospheric pressure producing a sintered body with a density ranging from about 80% to about 100%.