biquadratic


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Related to biquadratic: biquadratic polynomial

biquadratic

[¦bī·kwə′drad·ik]
(mathematics)
Any fourth-degree algebraic expression. Also known as quartic.
References in periodicals archive ?
At each performance evaluation, the compressor-mode bicubic is evaluated, and, if outdoor temperature is below room temperature, the economizer biquadratic is also evaluated; the mode of operation (compressor or economizer) is determined by which model returns the better COP.
The sum/difference stage with biquadratic filter allows users to choose from low pass, high pass, or band pass filter configurations.
This is different from the EnergyPlus model, which uses a biquadratic curve fit to represent the data.
5 and 6 has the Galerkin formulation, but with a biquadratic stress element.
The mathematical model is implemented using a Lagrangian finite element formulation; the pipe cross section is represented by a mesh of biquadratic isoparametric elements, which can be thought of as embedded in the material, and which thus deforms as the sag flow occurs.
The computational domain is discretized into a finite element mesh using biquadratic rectangular elements.
All variable are expanded in terms of biquadratic basis functions, except pressure, which is expanded in terms of bilinear basis functions.
1; thus, biquadratic velocity/bilinear pressure interpolation functions are assumed for each element.
This gives a biquadratic equation for A, which we parametrise using (8).
One can also see that the double mesh density of bilinear elements (L) produces roughly the same results as the reference density with biquadratic elements (Q).
The indoor coil capacity at various indoor and outdoor air temperatures is determined using the rated capacity and capacity-modifying biquadratic or cubic curves for temperature and a cubic or quadratic capacity modifying curve for Flow Fraction (2).
It is easy to check that in each case a biquadratic polynomial is uniquely determined by the dofs.