The effects of such unmeasured seasonal factors was therefore accounted for by including Fourier terms – which are linear combinations of sine and cosine functions of date.
The idea of this proposal is to represent the reflectance as a linear combination of sines and cosines, called an order n trigonometric polynomial [ 8], Eq (1), where the expansion coefficients are determined through the adjustment of data.
A set of static beam functions, which are a combination of sine series and third-order polynomial, is employed as the trial functions of the plate vibration velocity.
For this purpose, a displacement model with a combination of sine and cosine functions in the form of double Fourier series is taken.
The well-known ansatz for the amplitude functions of a simple homogeneous beam with no additional masses is a linear combination of sine, cosine, hyperbolic sine, and hyperbolic cosine functions.
The governing equations are obtained using the Raleigh Ritz method assuming a combination of sine and cosine functions in the form of double Fourier series for the displacement fields.
A fast converging series consisting of a set of static beam functions, which is a combination of sine series and polynomials, is developed and these functions are used as the basis functions in the Rayleigh Ritz method to study the vibrational characteristics of thin, isotropic rectangular plates.
However, anticipatory effects in pursuit can also be demonstrated when target motion varies predictively, for example when it is generated by a combination of sine waves of different frequencies [12] [15].
Ding and Sperling [24] were the first to measure the appearance of cyclopean image resulted from binocular combination of sine-wave gratings with identical frequency but different phases and contrasts in the two eyes, although contrast discrimination thresholds have been investigated in some previous studies [25], [26].
Incidence of legionellosis peaked in late summer and early autumn, with 49% of cases (n = 688) reported during the 4-month period from July to October, and significant seasonal oscillation (P for log-linear combination of sine and cosine model terms < 0.001).
