principal axis

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

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Noun

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 axis

axis - a straight line through a body or figure that satisfies certain conditions

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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

Questionnaire on conceptions about teaching: Factorial structure and reliability in academics of health careers in Chile. Questionnaire on conceptions about teaching

It is calculated by principal axis method using Equation (4).

Efficient Shape Classification using Zernike Moments and Geometrical Features on MPEG-7 Dataset

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.

Consideration of Three-Dimensional Attitude and Position Control for a Free-Floating Rigid Body Using Three Thrusters

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.

Breeding Ecology of a Reintroduced Population of Crested Ibis (Nipponia nippon) in Henan Province, China

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.

Vibration Control of Tower Structure with Multiple Cardan Gyroscopes

(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.

Multitemporal Volume Registration for the Analysis of Rheumatoid Arthritis Evolution in the Wrist

For the Lorenz gyrostat (4), this means [22] 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]).

A Gyrostatic Low-Order Model for the El Nino-Southern Oscillation

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.

Advanced signal analysis applied to discriminate different corrosion forms by acoustic emission data