Transitions INDEX

Migani, A. and Illas, F. (2006) A systematic study of the structure and bonding of halogens on low-index transition metal surfaces. J. Phys. Chem. 110, 11894-11906. 

A second generation lens, the Transitions Plus lens, was introduced in November 1992. In the years since, Transitions Optical has marketed a succession of new lenses. In September 1994 the EuroBrown lens appeared, formulated to give when activated a brown color, especially favored in the European market. The mid-index Transitions III lenses were launched in the United States and in Europe during 1996, and the Transitions XTRActive lenses were introduced in the US in January 1997. The most recently introduced lenses are Transitions III lenses in a standard index matrix. These use the latest technology in organic photochromic dyestuffs and polymer science and engineering, and maintain the company s position... 

Geng WT, Kim M, Freeman AJ (2001) Multilayer relaxation and magnetism of a high-index transition metal surface Fe(310). Phys Rev B 63 245401... 

Geng WT, Freeman AJ, Wu RQ (2001) Magnetism at high-index transition-metal surfaces and the effect of metalloid impurities Ni (210). Phys Rev B 63 064427 Zhang X-G, Van Hove MA, Somorjai GA et al (1991) Efficient determination of multilayer relaxation in the Pt(210) stepped and densely kinked surface. Phys Rev Lett 67 1298—1301 Hartel S, Vogt J, Weiss H (2010) Relaxation and thermal vibrations at the NaF(lOO) surface. Surf Sci 604 1996-2001... 

Falsig H, Shen J, Khan TS, Guo W, Jones G, Dahl S, Bligaard T. On the structure sensitivity of direct NO decomposition over low-index transition metal facets. Top Catal 2013 57 80-88. 

In this equation, the index j runs over all the transitions and the exponents have both real and imaginary parts, which... 

Solution Polymers. Acryflc solution polymers are usually characterized by their composition, solids content, viscosity, molecular weight, glass-transition temperature, and solvent. The compositions of acryflc polymers are most readily determined by physicochemical methods such as spectroscopy, pyrolytic gas—liquid chromatography, and refractive index measurements (97,158). The solids content of acryflc polymers is determined by dilution followed by solvent evaporation to constant weight. Viscosities are most conveniently determined with a Brookfield viscometer, molecular weight by intrinsic viscosity (158), and glass-transition temperature by calorimetry. 

Viable glass fibers for optical communication are made from glass of an extremely high purity as well as a precise refractive index stmcture. The first fibers produced for this purpose in the 1960s attempted to improve on the quahty of traditional optical glasses, which at that time exhibited losses on the order of 1000 dB/km. To achieve optical transmission over sufficient distance to be competitive with existing systems, the optical losses had to be reduced to below 20 dB/km. It was realized that impurities such as transition-metal ion contamination in this glass must be reduced to unprecedented levels (see Fig. 

In 1921, a discontinuous index of refraction of vitreous Si02 near the a—P transition of quart2 (crystalline Si02) was noted (17). These data and subsequent x-ray investigations of vitreous siHca led to the suggestion (18) that crystaUites on the order of 1.5 nm were present. It was demonstrated, however, that the crystal size would be less than 0.8 nm, and it was suggested that the term crystal loses meaning for these dimensions (19,20). 

In methacrylic ester polymers, the glass-transition temperature, is influenced primarily by the nature of the alcohol group as can be seen in Table 1. Below the the polymers are hard, brittle, and glass-like above the they are relatively soft, flexible, and mbbery. At even higher temperatures, depending on molecular weight, they flow and are tacky. Table 1 also contains typical values for the density, solubiHty parameter, and refractive index for various methacrylic homopolymers. 

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