Determination of the Equilibrium Melting Temperature of Polymer Crystals:  Linear and Nonlinear Hoffman−Weeks Extrapolations

1998 ◽  
Vol 31 (23) ◽  
pp. 8219-8229 ◽  
Author(s):  
Hervé Marand ◽  
Jiannong Xu ◽  
Srivatsan Srinivas
Keyword(s):  
Melting Temperature ◽  
Equilibrium Melting Temperature ◽  
Polymer Crystals ◽  
Linear And Nonlinear

Near-IR Spectroscopic Determination of NaCl in Aqueous Solution

1992 ◽  
Vol 46 (12) ◽  
pp. 1809-1815 ◽  
Author(s):  
Jie Lin ◽  
Chris W. Brown
Keyword(s):  
Aqueous Solution ◽  
Temperature Effects ◽  
Continuous Monitoring ◽  
Principal Component Regression ◽  
Principal Component ◽  
Standard Errors ◽  
Near Ir ◽  
Linear And Nonlinear ◽  
Ir Spectroscopic

The concentrations of NaCl in aqueous solutions have been determined with the use of near-IR spectra between 1100 and 1900 nm. Models expressing the concentration of NaCl are developed with linear and nonlinear regression with the use of the absorbances at selected wavelengths and with principal component regression (PCR) using entire spectra. Temperature perturbations on water bands interfere with the measurement of NaCl but can be removed by linear or nonlinear regressions using the absorbances at the wavelengths where the temperature effects are zero, or they can be accounted for by PCR. Standard errors of 5 mM and a detection limit of IS mM are obtained for NaCl. This technique can be applied for quantitative analysis of NaCl in the laboratory or can be readily adapted for continuous monitoring in process control.

Application of the cepstrum method for processing iridology television signals

2021 ◽  
Author(s):  
Keyword(s):  
Dynamic Range ◽  
Video Signal ◽  
Signal Power ◽  
Television System ◽  
Digital Correction ◽  
Linear And Nonlinear ◽  
Reading Beam

The questions of the cepstrum method application for the processing of iridology television signals are considered. A cepstrum method for processing a delayed video signal of an aerospace television system is proposed. The application of the method greatly facilitates the determination of the delay and expands the dynamic range of the corrected signal. An expression for determining the power cepstrum at different apertures of the reading beam is received and a suboptimal model of an ideal corrector is designed. Keywords aperture correction; digital correction; linear and nonlinear correctors; cepstrum method; aperture; Gaussian aperture; exponential aperture; signal power cepstrum

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