In the Rayleigh equation, the mean MMP was 1.04 (SD 0.11).
The Rayleigh equation is an important tool in the assessment of acquired colour vision deficiency and is the test of choice for detecting and diagnosing M-L mechanism deficiencies .
Baseline Number of eyes 19 Rayleigh equation MMP Mean [+ or -] SD 1.04 [+ or -] 0.11 Pseudoprotanomaly (%) 5 (26.3%) Moreland equation MMP Mean [+ or -] SD 0.94 [+ or -] 0.15 Achromatic pattern (%) 84.2% Early follow-up ([less than or equal to]6 months) Number of eyes 15 Rayleigh equation MMP Mean [+ or -] SD 0.98 [+ or -] 0.08 Pseudoprotanomaly (%) 4 (26.7%) Moreland equation MMP Mean [+ or -] SD 1.0 [+ or -] 0.12 Achromatic pattern (%) 93.3% Long-term follow-up Fellow eye (9-31 months) Number of eyes 37 30 Rayleigh equation MMP Mean [+ or -] SD 0.97 [+ or -] 0.08 0.95 [+ or -] 0.08 Pseudoprotanomaly (%) 13 (35.1%) 6 (20%) Moreland equation MMP Mean [+ or -] SD 0.99 [+ or -] 0.11 0.95 [+ or -] 0.12 Achromatic pattern (%) 33 (89.2%) 43.3% MMP, midmatching point; SD, standard deviation.
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In this present paper, we investigate the existence and uniqueness of the periodic solutions of the following Rayleigh equation with two delays
As we know, Rayleigh equation can be derived from many fields, such as physics, mechanics and engineering technique fields.
In this direction, many researchers (see [4-9]) continued to discuss the Rayleigh equation and got some new results on the T-periodic solutions of Eq.(1.1), and generalized the results in .
Where an exponential enrichment occurs in the residual substrate pool, as in the case of a nitrate pool undergoing denitrification, the [delta][sup.15]N of the residual nitrate increases in proportion to the logarithm of the residual nitrate fraction (Kendall 1998), which can be expressed using the classic Rayleigh equation (Mariotti et al.
Using the Rayleigh equation we calculated a linear relationship between N[O.sub.3]-[delta][sup.15]N and the log (In) of the N[O.sub.3]-N concentration for both topsoil and subsoil, indicating that denitrification was the predominant mechanism of N[O.sub.3]-N loss.
Thus only the roots of the Rayleigh equation
[[DELTA].sub.t] = 0 will be considered.