A comparison of monocular and binocular refractive results in prepresbyopes

There have been several reports in the literature documenting various methods of binocular refractions and how they compare to traditional refractive methods. However, no studies have been published in which the subjects were allowed to compare the two prescriptions subjectively. A total of eighty-one subjects was assessed. Each was given two refractions: a traditional one and a binocular one utilizing the AO Vectographic Slide. Forty-nine of these subjects had significant differences in the prescriptions and of these, fifteen chose to participate in a wearing trial using both of the prescriptions. The percentage of eyes showing more than a 0.25D change was 20% in spherical power, 22% in cylindrical power, and 27% in equivalent spherical power. Nine percent of eyes showed an axis shift equivalent to a 0.25D induced change in power. Eight percent of subjects had a change in anisometropia based on the equivalent sphere and 19% of subjects required a vertical prism on the binocular refraction. In the clinical trial, 42% preferred the binocular prescription, 28% preferred the traditional prescription, and 28% liked both prescriptions equally

Energy and operating cost analysis of the smart-scaled flow route directly to adipic acid

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ABSORPTION OF GASES INTO ACTIVATED CARBON WATER SLURRIES IN A STIRRED CELL

A surface-aerated stirred cell with a flat liquid surface was used to investigate the absorption of propane and ethene gas into slurries of activated carbon and water. Slurries with a solids concentration up to 4% by weight and particle diameters up to 565-mu-m were used. The experimental mass transfer data were interpreted using a three-resistance model (gas-liquid, liquid-solid and intraparticle resistance). The gas-liquid mass transfer coefficient was found to be enhanced by the presence of small carbon particles in the slurry, the maximum enhancement factor being 3.5. This enhancement was not influenced by the addition of 0.6% by weight of large particles (d(p) = 565-mu-m) to the liquid phase. Intraparticle resistance to mass transfer is low, which can be explained by assuming surface diffusion of the adsorbed molecules on the porous carbon

Selective sorption of gases in slurries of activated carbon in water.

In de chemische industrie worden dagelijks grote hoeveelheden gassen gescheiden, onder andere voor het verwj.jderen van giftige en slecht riekende componenten. Hiertoe zijn vele processen ontwikkeld, gebaseerd op verschillen in eigenschappen van de te scheiden gassen. Twee op grote schaal toegepaste processen zijn selektieve absorptie in een vloeistof en adsorptie aan een vaste stof. ... Zie: Samenvatting