This paper describes the results of experimental testing of glass fiber reinforced plastic (GFRP) composite beam strengthened reinforced concrete (RC) slabs with two symmetrical openings. Specimens, one-half scale, have been designed and fabricated to reflect the most common RC bathroom slab used in school buildings. The specimen had dimensions of 2000 mm (width) × 150 mm (thickness) × 3000 mm ...

In earlier work it was suggested that the frictional constraint of a porous sample around its circumference in a standing wave tube resulted in shearing resonances of the sample. In the present work that effect has been confirmed by direct measurement of the spatial distribution of the velocity of the solid phase of a fibrous sample placed in a rigidly terminated standing wave tube and driven i...

Abstract Fiberglass-reinforced plastics (FRP) composite materials for ships that are widely used marine-grade unsaturated polyester resin matrix and combimat fiber, a combination of chopped strand mat (CSM) woven roving (WR) fibers. Although less popular than marine CSM–WR, biaxial warp-knitted glass fabrics have the potential to be applied as fiber laminates ship hull materials. A comparative ...

10.1517/14622416.6.4.439 © 2 For years we have recognized that using genetics to target the right medicines to the right patients at the right time could improve healthcare; however, technical and financial constraints have prevented researchers from conducting the comprehensive, whole-genome association studies required to make such advances. Now, Perlegen and its collaborators are making pers...

It is generally agreed that the biodurability of man-made vitreous fibers is a major factor for the characterization of potential health effects. As there is currently no standardization of experimental protocols to determine biodurabilty, the results of the clearance assays have not been used up to now for regulatory purposes. Methods used to analyze biodurability in animal models are short-te...

UNLABELLED Used ventilation filters are a major source of sensory pollutants in air handling systems. The objective of the present study was to evaluate the net effect that different combinations of filters had on perceived air quality after 5 months of continuous filtration of outdoor suburban air. A panel of 32 subjects assessed different sets of used filters and identical sets consisting of ...

Thin glass fibers imbedded into a glass cladding of slightly lower refractive index represent a promising medium for optical communication. This article presents simple formulas and functions for the fiber parameters as a help for practical design work. It considers the propagation constant, mode delay, the cladding field depth, and the power distribution in the fiber cross section. Plots vs fr...

Twenty-eight greenhouse screening materials, with predetermined airflow resistance values, were evaluated for exclusion of the silverleaf whitefly Bemisia argentifolii Perring & Bellows and thrips from a mixed-species population. Screens differed in exclusion efficacy, expressed as a percentage of the fiberglass window screen control and at an approach velocity of 92 m/min, from -35 to 94% for ...