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Resource Documents: VAD (13 items)
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Acquired flexural deformity of the distal interphalangic joint in foals
Author: Pereira Costa e Curto, Teresa Margarida
ABSTRACT: Since 2008, a high prevalence of front limb acquired flexural deformities was observed in a Lusitano stud farm. This work aims to evaluate this problem by reporting the results from tissue alterations in the affected animals as well as environmental conditions and management changes that could have led to this observation. A total of eleven affected animals were studied. In these, complete physical and orthopaedic examinations were performed, specifically the determination of the angle between the dorsal hoof wall . . .
More »Vibroacoustic disease: biological effects of infrasound and low-frequency noise explained by mechanotransduction cellular signalling
Author: Alves-Pereira, Mariana; and Castelo Branco, Nuno
Abstract At present, infrasound (0–20 Hz) and low-frequency noise (20–500 Hz) (ILFN, 0–500 Hz) are agents of disease that go unchecked. Vibroacoustic disease (VAD) is a whole-body pathology that develops in individuals excessively exposed to ILFN. VAD has been diagnosed within several professional groups employed within the aeronautical industry, and in other heavy industries. However, given the ubiquitous nature of ILFN and the absence of legislation concerning ILFN, VAD is increasingly being diagnosed among members of the general population, including . . .
More »Low Frequency Noise: A Major Risk Factor in Military Operations
Author: Castelo Branco, Nuno
Paper presented at the NATO Research and Technology Organisation’s Applied Vehicle Technology Symposium on “Ageing Mechanisms and Control: Part A – Developments in Computational Aero- and Hydro-Acoustics”, held in Manchester, U.K., 8-11 October 2001, and published in RTO-MP-079(I). Background. Noise is a major factor in many military environments. Usually the concern is with the higher frequency bands (>500 Hz) that cause hearing damage or interfere with speech. Protection against noise is thus focused on these higher frequencies, while the bands . . .
More »Infrasound and low frequency noise dose responses
Author: Alves-Pereira, Mariana; and Castelo Branco, Nuno
ABSTRACT The acoustical spectrum is usually divided into two major segments: that which can be heard by the human ear, and that which cannot. Moreover, it is usually maintained that if acoustical phenomena do not hurt the ear, then they will have no other bodily effects. In the electromagnetic (E&M) spectrum, there is also a segment capable of being perceived by human senses: visible radiation (light). However, unlike the acoustical spectrum, the E&M spectrum is not crudely divided in what . . .
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