PURPOSE To estimate the prevalence of vocal symptoms, occupational risk factors, associated symptoms and their impact on the professional activity of the telemarketers. METHODS Cross-section analytical study with 124 telemarketers and 109 administrative workers (control group) selected from a random sample stratified by gender. The subjects answered an anonymous self-administered questionnair...

Eigenspectra of a spinless quantum particle trapped inside rigid, rectangular, two-dimensional (2D) box subject to diverse inner potential distributions are investigated under hermitian, as well non-hermitian antiunitary $\mathcal{PT}$ (composite parity and time-reversal) symmetric regimes. Four sectors or "stripes" inscribed in the rigid comprising contiguously conjoined parallel rectangular s...

BACKGROUND Quality of voice after immediate recurrent laryngeal nerve (RLN) reconstruction in thyroid cancers has not been thoroughly studied. METHODS Thirteen patients with fixed vocal cords (fixed vocal cord group) and 8 patients with intact or impaired mobile vocal cords (mobile vocal cord group) who had immediate RLN reconstruction simultaneously with total thyroidectomy, and patients who...

We used B-mode imaging to study the vibratory phenomena of the vocal folds. The presence of multilayered structures of the vocal folds in the B-mode image was verified by using freshly excised human larynges in vitro. To capture images of vocal fold vibration, a special treatment was used to reconstruct the aliasing B-mode motion pictures of vocal fold vibration. Echo-particle image velocimetry...

Vocal effort is a physiological magnitude that accounts for the changes in voice production that occur as vocal loading, which is the stress inflicted on the vocal folds when speaking for long periods, increases. It has been quantified in terms of Sound Pressure Level (SPL). In previous research, it has been shown that prolonged vocal effort can lead to vocal fatigue. An experiment was conducte...

This research is a follow-up to the previous research which was dealing with the creation of the simulation of the vocal cords function using FEM. This paper focuses on how the vocal cords function is affected by Bernoulli’s effect, while using model [1] is used. It is well known, that Bernoulli’s effect is connected with the suction in the air space between the vocal cords. This is caused by t...

background: makhaarej al-horouf, the study of speech sounds by avicenna is a valuable piece of work in the study of speech sounds, which was written about ten centuries ago. it contains six chapters on sound, anatomy of vocal tract, and phonetics. it is amazing to find that avicenna’s explanations are congruent with the findings of modern scholarship in relevant topics. the study was intended t...