Definitions /Dictionary/Glossary - nptel

where 1- α is called the confidence coefficient. A statement of type (1) or (2) is called a onesided
confidence interval and a statement of type (3) is called a two-sided confidence interval. In
(1) a is a lower confidence limit and in (2) b is an upper confidence limit. With probability at
least 1- α, the confidence interval will contain the parameter θ.
Connection: Where two panels are attached to each other or a panel is attached to the building.
Consolidation: A processing step that compresses fiber and matrix to reduce voids and achieve a
desired density.
Constituent: In general, an element of a larger grouping. In advanced composites, the principal
constituents are the fibers and the matrix.
Contact Adhesive: An adhesive that .is apparently dries to touch and that will adhere to itself
simultaneously upon contact.
Contact Molding: A process for molding reinforced plastics in which reinforcement and resin
are placed on a mold, cure is either at room temperature using a catalyst-promoter system or by
heat in an oven and no additional pressure is used.
Contact Pressure Molding: A method of molding in which the pressure, usually less than 69
kPa (10 psi), is usually necessary to hold the materials together.
Contact Pressure Resin: Liquid resins that thicken or polymerize on heating and when used for
bonding laminates, require little or no pressure.
Contaminant: Impurity or foreign substance that affects one or more properties of composite
material, particularly adhesion.
Continuous Filament: A yarn or strand in which the individual filaments are substantially the
same length as the strand.
Continuous-Filament Yarn: Yarn that is formed by twisting two or more continuous filaments
into a single continuous strand.
Continuous Heat Resistance: This is the maximum temperature the material should be
subjected to in a continuous application. Below this temperature the material is acceptable.
Above this temperature the material may decompose, melt, or otherwise fail in an application.
Units - degrees Fahrenheit ((F) - degrees Centigrade ((C). Higher numbers mean that the material
can be used continuously at higher temperatures.
Continuous Laminating: A process for forming panels and sheeting in which fabric or a mat is
passed through a resin dip, brought together between cellophane covering sheets, and passed
through a heating zone for cure. Squeeze rolls control thickness and resin content as the various
plies are brought together.