Reflectivity, components silver

In support of the conclusion based on silver, series of 0.2, 0.5, 1.0, 2.0, and 5.0 % w/w of platinum, iridium, and Pt-Ir bimetallic catalysts were prepared on alumina by the HTAD process. XRD analysis of these materials showed no reflections for the metals or their oxides. These data suggest that compositions of this type may be generally useful for the preparation of metal supported oxidation catalysts where dispersion and dispersion maintenance is important. That the metal component is accessible for catalysis was demonstrated by the observation that they were all facile dehydrogenation catalysts for methylcyclohexane, without hydrogenolysis. It is speculated that the aerosol technique may permit the direct, general synthesis of bimetallic, alloy catalysts not otherwise possible to synthesize. This is due to the fact that the precursors are ideal solutions and the synthesis time is around 3 seconds in the heated zone. 

Brewster polarizers were widely used in infrared spectroscopy in two varieties. The first of them directly utilizes the reflected beams that contain the pure perpendicular component while the second type functions in transmission. Frequently used materials for Brewster polarizes are selenium (in old designs), silver bromide, KRS-5, germanium and silicon. The general requirement for the material used in these types of polarizers is to have a large refractive index. The higher the latter is the better parallel and peipendicular components of radiation separate. 

Figure 3-5 illustrates schematically a typical double-beam-in-space system in which all components are dupH-cated except the light source. Another approach is a double-beam-in-time instrument that uses a light-beam chopper (a rotating wheel with alternate silvered sections and cutout sections) inserted after the exit slit (Figure 3-6). A system of mirrors passes the portions of the light reflected...

Some sulfur compounds can also have a corroding action on the various metals of the engine system, varying according to the chemical type of sulfur compound present. Fuel corrosivity is assessed by its action on copper and is controlled by the copper strip test (ASTM D-130, IP 154), which specifies that not more than a slight stain shall be observed when the polished strip is immersed in fuel heated for 2 h in a bomb at lOO C (212°F). This particular method is not always capable of reflecting fuel corrosivity toward other fuel system metals. For example, service experience with corrosion of silver components in certain engine fuel systems led to the development of a silver corrosion test (IP 227). The mercaptan sulfur content (ASTM D-1219, ASTM D-3227, IP 104, IP 342) of jet fuels is limited because of objectionable odor, adverse effect on certain fuel system elastomers, and... 

An optical interferometric technique is used to measure the separation D, simultaneously providing also the liquid refractive index n and the curvature R. The mica sheets are made partially reflecting by evaporating a 40 -f 50 nm silver layer on the inner sides of the mica sheets. The cell is then illuminated by a collimated white light beam, in a direction perpendicular to both axis of the cylinders. The two partially reflective silver layers form a sort of three-layer curved interferometer selective transmission occurs only for the spectral components resonating with the mica/liquid/mica cavity . The transmitted wavelengths A are analyzed by an interferometer with a resolution better than 0.1 nm, to get information about the optical properties of the layers, especially the thickness D and the index n of the liquid. 

Silver and silver alloys are used for electrical contacts, connecting leads in semiconductor devices, solders and brazes, corrosion-resistant structural parts, batteries, oxidation catalysts, optical and heat reflecting mirrors, table ware, jewellery, dentistry, and coins. Silver halides are base components in photographic emulsions. 

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