http://glassestech.com Mon, 08 Mar 2010 09:56:35 +0000 http://backend.userland.com/rss092 en Once again, Drs Milder and Rubin have provided an invaluable text for all who deal with refractive correction of the eye. The Fine Art of Prescribing Glasses: Without Making a Spectacle of Yourself, Third Edition, has been thoughtfully updated and revised by the authors. The text’s 22 chapters thoroughly cover ... http://glassestech.com/glasses-405.html The addition of alkali oxides to silicate glasses results in the disruption of the silicate network and the formation of non-bridging oxygen atoms and Qn species. Lithium-containing silicate glasses behave differently than other alkali-containing silicate glasses. Addition of Li2O to silicate and germanate glasses generates Q2 species at low Li ... http://glassestech.com/glasses-403.html We analyzed the glassy-state structural relaxation of polymers near surfaces and interfaces by monitoring fluorescence in multilayer films. Relative to that of bulk, the rate of structural relaxation of poly(methyl methacrylate) is reduced by a factor of 2 at a free surface and by a factor of 15 at a ... http://glassestech.com/glasses-401.html The Ontong Java Plateau in the western Pacific is anomalous compared to other oceanic large igneous provinces in that it appears to have never formed a large subaerial plateau. Paleoeruption depths (at 122 Ma) estimated from dissolved H2O and CO2 in submarine basaltic glass pillow rims vary from ∼1100 m ... http://glassestech.com/glasses-399.html Video glasses have previously been reported to be an effective instrument for emotion induction or for reducing pain perception. In the present study, we assessed the application of video glasses within the affective picture viewing paradigm. Possible advantages of this new method were tested by a comparison with a commonly ... http://glassestech.com/glasses-397.html Evaporative modification of silicates during impacts by large meteorites is the result of high-temperature processing of colliding silicate materials. There are still unresolved questions about the influence of vaporization on the chemical compositions of impact glasses. Here we present the results of experimental modeling of impact-related high-temperature pulse heating of ... http://glassestech.com/glasses-395.html Purpose: To compare base-in prism reading glasses with placebo reading glasses for the treatment of symptomatic convergence insufficiency (CI) in children aged 9 to http://glassestech.com/glasses-393.html To better understand the relationship between atomic-scale structures and densities of aluminosilicate glasses and liquids, we used 27Al MAS NMR to determine the speciation of aluminum ions in K3AlSi3O9, Na3AlSi3O9, and Ca3Al2Si6O18 glasses quenched from melts at 3 to 10 GPa. These data are a first approximation of high-pressure melt ... http://glassestech.com/glasses-391.html The structure of multi-component silicate melts and glasses (e.g., Ca-Mg and Ca-Na aluminosilicates) can provide insight into the properties of natural silicate melts and has implications for relevant magmatic processes. In spite of its importance, the atomic and molecular structure of most multi-components (e.g., quaternary) melts and glasses has not ... http://glassestech.com/glasses-389.html Typical liquidus temperatures can be over 1000 °C greater than the glass transition temperatures for high-pressure aluminosilicate melts so the effect of temperature must be determined if glass data is to be used to approximate the structural speciation present in geologic melts. This study has investigated the effect of fictive ... http://glassestech.com/glasses-388.html