On the penetration of particles through filters and masks.

El principal objetivo de este trabajo es la evaluación de la eficiencia de filtros y máscaras destinados a la protección de los trabajadores contra partículas sólidas respirables. Se ha diseñado un dispositivo que simula los ciclos respiratorios del ser humano de forma automática. Filtros y máscaras se ensayan en el interior de una cámara, en una atmósfera controlada, y se introducen partículas de polvo en suspensión en su interior. Las partículas de polvo pasan a través de los filtros y se toma una muestra en vía húmeda. Se toma una muestra de polvo después de pasar por los filtros y se compara con la inicial, en una forma cualitativa y cuantitativa, mediante gravimetría y difracción laser. Analizados los resultados, se ha observado una variabilidad significativa en la eficiencia de máscaras y filtros pertenecientes a una misma categoría, por lo que se han sugerido recomendaciones a la normativa actual.

Definition of masks related to psychovisual features for video quality assessment

Video Quality Assessment needs to correspond to human perception. Pixel-based metrics (PSNR or MSE) fail in many circumstances for not taking into account the spatio-temporal property of human's visual perception. In this paper we propose a new pixel-weighted method to improve video quality metrics for artifacts evaluation. The method applies a psychovisual model based on motion, level of detail, pixel location and the appearance of human faces, which approximate the quality to the human eye's response. Subjective tests were developed to adjust the psychovisual model for demonstrating the noticeable improvement of an algorithm when weighting the pixels according to the factors analyzed instead of treating them equally. The analysis developed demonstrates the necessity of models adapted to the specific visualization of contents and the model presents an advance in quality to be applied over sequences when a determined artifact is analyzed.

Emergency airway management by intensive care unit nurses with the intubating laryngeal mask airway and the laryngeal tube

When using the laryngeal tube and the intubating laryngeal mask airway (ILMA), the medium-size (maximum volume 1100 ml) versus adult (maximum volume 1500 ml) self-inflating bags resulted in significantly lower lung tidal volumes. No gastric inflation occurred when using both devices with either ventilation bag. The newly developed medium-size self-inflating bag may be an option to further reduce the risk of gastric inflation while maintaining sufficient lung ventilation. Both the ILMA and laryngeal tube proved to be valid alternatives for emergency airway management in the experimental model used.

Browere's life masks of great Americans,

Plates accompanied by guard sheets with descriptive letterpress.

The book of masks.

Mode of access: Internet.

Masks in a pageant,

Mode of access: Internet.

Masks, with Jim's beast, Tides, Among the lions, The reason, The house;

Mode of access: Internet.

Perceptual and instrumental analysis of laryngeal function after traumatic brain injury in childhood

Objective: To investigate laryngeal function and phonatory disturbance in children with traumatic brain injury (TBI), using both perceptual and instrumental techniques. Design and participants: The performance of 16 individuals with moderate to severe TBI acquired in childhood and 16 nonneurologicatly impaired control subjects was compared on a battery of perceptual (Frenchay Dysarthria Assessment, speech sample analysis) and instrumental (Aerophone II, laryngograph) assessments. Results and conclusions: As a group, the children with TBI demonstrated normal, or only minimally impaired laryngeal function, when compared with the control group, which contrasts with the significant laryngeal impairment noted in adults after TBI. Several reasons for the different findings in relation to laryngeal function in adults and children after TBI are postulated: (1) differing types of injury usually incurred by adults and children may result in a relatively decreased degree of neurologic impairment in these children, (2) differences in recovery potential between adults and children, and (3) the pediatric larynx is still developing, hence it may be better able to compensate for any impairment incurred.