# principal axis

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Related to principal axis: centre of curvature

## principal axis

n
1. (General Physics) the line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror
2. (General Physics) any of three mutually perpendicular axes about which the moment of inertia of a body is maximum
ThesaurusAntonymsRelated WordsSynonymsLegend:
 Noun 1 principal axis - a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly"optic axisaxis - a straight line through a body or figure that satisfies certain conditions
References in periodicals archive ?
In order to provide evidence of the QCAT's validity of construct, the factorial structure was evaluated by performing exploratory factorial analysis (EFA), applying Principal Axis Analysis (PAA) as the extraction method.23 Kaiser-Guttman and Catell criteria23 as well as Horn Parallel Analysis were used to pick the more prominent factors.23
Three thruster configurations that guarantee bidirectional control torques for two principal axes generate dependent torque with respect to the third principal axis of a satellite.
The first principal axis showed that the nest tree height (NTH), nest height (NHE), diameter of the nest tree (DBH), distance to stream (DST) and average arbor height (AAH) were the higher loads, which mainly represented the vegetation factor and food factor.
It is the principal axis of the inner ring and the axis symmetric rotor but does not participate in the high-speed rotation of the rotor; therefore, [e.sup.2] is often used as the reference coordinate system on the dynamic calculation.
(i) Because the first rotation refers to the eigenvector associated with the largest eigenvalue, its effect is the most relevant, it is associated with the most informative content, and it aligns the two bones along their first principal axis.
Through curve normalization, the major principal axis of moment of inertia is aligned with the x-axis; then, the width w and height h of the bounding box of the curve are evaluated; finally, the curve with the bounding box is scaled by a factor of 1/w and translated to the origin.
For the Lorenz gyrostat (4), this means  that the rotor is rotating around its principal axis 1 ([h.sub.2] = [h.sub.3] = 0) with a constant external force directed along this axis, while its ellipsoid of inertia is the ellipsoid of rotation around another principal axis, axis 3 ([I.sub.1] = [I.sub.2]).
Another method used in factor extraction is Principal Axis Factoring (PA) or simply Factor Analysis, which is used more often when the objective is to identify latent dimensions that reflect what the variables have in common (Hair et al, 2009).
Contract award notice: agreement - framework for "ekponisi topography studies and land for the needs of" egnatia odos sa "(principal axis vertical axis, works infrastructure thessaloniki and other needs) - ref.
Variables data-set identifies three principal axis that could be useful to discriminate the occurring event that actually happens during the corrosive phenomena: Time-Axis, Waveform-Axis, Event-Axis.

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