This paper introduces the concept of a process capability matrix—an ordered set of dimensionless parameters that capture information on a manufacturing system’s response to disturbances. The matrix is similar to the process capability indices Cp and Cpk, but is extended to multiple acceptance criteria and multiple causes of variation. Equations are presented that use the matrix to estimate yield in manufacture of products with multiple acceptance criteria. The surface mount of large body electronic packages serves as an example of the effectiveness of the process capability matrix as a tool for design decision making. [S1087-1357(00)01601-4]
The lifetime of stressed silica fibers is normally limited by moisture-enhanced stress corrosion cracking known as static fatigue. We have developed a metal-jacketing technique that provides a hermetic protection of the glass fiber surface. Fibers protected in this fashion appear to be immune to normal static fatigue effects. Lifetimes of stressed silica fibers with hermetic jackets have been observed to be more than five orders of magnitude longer than those of conventional plastic-coated fibers.
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