Spectrographic Chemical Analysis. I

Section 16.0: Spectrographic Analysis of Combustion Products

The quantitative spectrographic analysis of the rare earth elements.

Spectrographic methods applicable to the determination of major rare earth constituents in complex mixtures are described. The specific examples discussed are the determination of yttrium and gadolinium in the concentration range of 10 to 100 per cent. The procedures involve the high current DC arc excitation of rare earth oxide sample-ceric oxide-graphite mixtures. Selected lines of cerium are...

Phono-spectrographic analysis of heart murmur in children

BACKGROUND More than 90% of heart murmurs in children are innocent. Frequently the skills of the first examiner are not adequate to differentiate between innocent and pathological murmurs. Our goal was to evaluate the value of a simple and low-cost phonocardiographic recording and analysis system in determining the characteristic features of heart murmurs in children and in distinguishing innoc...

Spectrographic Analysis of Animal Vocalizations: Implications of the "uncertainty Principle"

Many animal vocalizations are non-periodic, frequency-modulated signals. Because this type of signal varies simultaneously in two dimensions, time and frequency, spectrographic measurement is constrained by the "uncertainty principle": to increase accuracy of measurement in one dimension we must sacrifice accuracy of measurement in the other dimension. Although this trade-off is unavoidable, in...

Spectrographic Analysis of Dagbani Vowels Fusheini Abdul-rahman Acknowlagement

The study presents an acoustic analysis of 15 stressed short and long vowels of Dagbani with detailed formant frequency and duration characteristics of the vowels produced in the open monosyllabic (CV) phonetic context by 15 male and 15 female speakers of Nanuni, Nayahili, and Tomosili dialects of Dagbani. The aim of the study was to provide an acoustic evidence of vowel quality in Dagbani thro...