Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 2 de 2
Filtrar
Más filtros

Bases de datos
Tipo del documento
Intervalo de año de publicación
1.
Chemosphere ; 350: 141121, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38185423

RESUMEN

The use of lignocellulosic waste as an energy source for substituting fossil fuels has attracted lots of attention, and pyrolysis has been established as an effective technology for this purpose. However, the utilization of bio-oil derived from non-catalytic pyrolysis faces certain constraints, making it impractical for direct application in advanced sectors. This study has focused on overcoming these challenges by employing fractional condensation of pyrolytic vapors at distinct temperatures. The potential of five types of sawdust for producing high-quality bio-oil through pyrolysis conducted with a bench-scale bubbling fluidized bed reactor was investigated for the first time. The highest yield of bio-oil (61.94 wt%) was produced using sample 3 (damaged timber). Remarkably, phenolic compounds were majorly gathered in the 1st and 2nd condensers at temperatures of 200 °C and 150 °C, respectively, attributing to their higher boiling points. Whereas, carboxylic acid, ketones, and furans were mainly collected in the 3rd (-5 °C) and 4th (-20 °C) condensers, having high water content in the range of 35.33%-65.09%. The separation of acidic nature compounds such as acetic acid in the 3rd and 4th was evidenced by its low pH in the range of 4-5, while the pH of liquid collected in the 1st and 2nd condensers exhibited higher pH (6-7). The well-separated bio-oil derived from biomass pyrolysis facilitates its wide usage in various applications, proposing a unique approach toward carbon neutrality. In particular, achieving efficient separation of phenolic compounds in bio-oil is important, as these compounds can undergo further upgrading to generate hydrocarbons and diesel fuel.


Asunto(s)
Calor , Polifenoles , Pirólisis , Biocombustibles , Aceites de Plantas , Fenoles/análisis , Biomasa
2.
Am J Phys Med Rehabil ; 86(11): 901-6, 2007 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-17873826

RESUMEN

OBJECTIVE: To assess the additive effect of adjuvant electrical stimulation on botulinum toxin A injection in children with spastic diplegic cerebral palsy. DESIGN: Eighteen children with dynamic foot equinus deformity were treated with botulinum toxin A injection into the calf muscles. Seven children were assigned to a treatment group who received botulinum toxin A and adjuvant electrical stimulation, and 11 children were assigned to a control group with botulinum toxin injection only. Before botulinum injection, and at 2 wks and 3 mos after injection, the Physician Rating Scale, passive ranges of ankle and knee motion, and the modified Ashworth scale were measured. RESULTS: A significant increase in passive range of ankle motion was observed at 2 wks after injection in the treatment group and at 3 mos after injection in both groups. Both groups showed significant improvements by the modified Ashworth scale at 2 wks after injection. Subscales of the Physician Rating Scale (equinus foot, crouched gait) and total Physician Rating Scale scores were significantly improved in the treatment group at 3 mos after injection, but this was not observed in the control group. CONCLUSIONS: Adjuvant electrical stimulation for a short period after botulinum toxin A injection was found to benefit early improvement of range of motion and maintenance of gait improvement in children with spastic diplegia cerebral palsy showing dynamic equinus.


Asunto(s)
Toxinas Botulínicas Tipo A/uso terapéutico , Parálisis Cerebral/rehabilitación , Terapia por Estimulación Eléctrica , Marcha , Fármacos Neuromusculares/uso terapéutico , Toxinas Botulínicas Tipo A/administración & dosificación , Niño , Preescolar , Femenino , Humanos , Lactante , Inyecciones Intramusculares , Masculino , Músculo Esquelético , Fármacos Neuromusculares/administración & dosificación , Rango del Movimiento Articular , Resultado del Tratamiento
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA