Cyclic light and dark-reared rats were exposed to intense visible light for various periods and then rhodopsin-measured following recovery in darkness for up to 14 days. Animals were injected with ascorbic acid or ascorbate derivatives at various doses prior to light exposure in green Plexiglas chambers. The results show that ascorbic acid administration elevates retinal ascorbate and reduces t...

We tested the hypothesis that environmental stress is a predisposing factor for liver injury by examining the effect of acute restraint on liver injury provoked by carbon tetrachloride (CCl4) and allyl alcohol. Mice were immobilized using Plexiglas restraint cages, producing a form of psychogenic stress, whereas other animals were allowed to roam free. Serum alanine aminotransferase levels were...

This paper investigates proppant flow and transport in intersected fractures at angles typical for intersections of pre-existing new hydraulic fractures. Proppant is small granular material, which placed into during geothermal hydrocarbon reservoir stimulation props the fluid paths open exploitation. study uses plexiglas laboratory slot experiments enhanced with advanced image analysis identify...

A new methodology for implementing radioactive particle tracking (RPT) in bubble columns with intense vertical rod internals was developed and implemented to investigate the effect of dense on hydrodynamics. The utilizes a hybrid Monte Carlo N-Particle (MCNP) simulation an automated RPT calibration device generate large number points accurate reconstruction instantaneous positions particles usi...

Abstract The aim of this study is to separate PET flakes by applying floatation technique, initially from binary polymer blends and later the mixture five common polymers such as polypropylene, polyethylene, poly(vinyl chloride), polstyrene poly(ethylene terephthalate). A connection line between fiber presumed in study, because dyeing recovered polyester with three disperse dyes followed. separ...

Distortions of magnetic resonance images near solid-liquid interface appear as the result of the restriction to spin self-diffusion in the proximity of impermeable boundary as well as of a susceptibility difference. The spectral analysis of spin echo enables to resolve, in a simple way, how various RF-gradient pulse sequences reduce the effect of the internal magnetic field induced by the susce...

Free radical polymerization is one of the most widely employed polymerization techniques. This technique is applied to prepare latexes to be used in paints, high molecular weight poly (methyl methacrylate) for safety glass (Plexiglas), or foamed poly (styrene) to be applied in coffee cups. Some advantages of radical polymerizations, with respect to other techniques, are the relative insensitivi...

We study avalanches in a model for a planar crack propagating in a disordered medium. Due to long-range interactions, avalanches are formed by a set of spatially disconnected local clusters, the sizes of which are distributed according to a power law with an exponent tau{a}=1.5. We derive a scaling relation tau{a}=2tau-1 between the local cluster exponent tau{a} and the global avalanche exponen...

In earlier work we developed inductive coupling for surface-mounted Lamb wave transducers operating at relatively low frequencies, such as 300 kHz. We now report on similar inductively-coupled transducers at higher (multiple MHz) frequencies. Our investigation was motivated by a particular application, to examine a box girder top flange, using transducers mounted along the flange edge. We emplo...