Materials Literature
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The transport of water in silicate melts is examined from a theoretical point of view, taking into account the presence of both H2O and OH-1 species. It was assumed that only H2O molecules may diffuse and that a constitutive relationship between the number density \documentclass{aastex} \usepackage{amsbsy} \usepackage…
InP and InGaAs electronic devices are subject to deterioration of their properties upon exposure to air, moisture, and irradiation due to the instability of their surfaces. Attempts to protect device surfaces by overcoating them with a plasma deposited protective coating are frustrated by a marked deterioration of the…
A thin-film technique has been developed for vacuum fabrication of mirrors with Gaussian reflectivity profiles. Samples with diameters from 2 to 8 mm and assigned maximum reflectivities for visible or near-IR wavelengths have been made and their optical properties evaluated. By properly choosing both the geometry of t…
The sodium salt of the dinucleoside phosphate d(GpG), dissolved in water, forms two mesophases which have been characterized, by optical microscopy, as being of the cholesteric (columnar chiral nematic, N∗) and hexagonal (M) type.
Experiments were performed to clarify the role of metallic fuel additives in relation to soot suppression in a well defined laboratory-scale diffusion flame. Principal emphasis was given to three alkaline-earth metals; namely, Ba, Sr and Ca. The experiments included Cu, Sn, Li, Na and K as well. but only to the extent…
Abstract The solid state of the complex between poly(acrylic acid) (PAA) and poly(ethylene oxide) (PEO), and that between poly(methacrylic acid) (PMAA) and PEO formed via hydrogen‐bonding was studied by differential‐scanning calorimetric (DSC) and by Fourier‐transform infrared (FT–IR) spectroscopic measurements. Melti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriplet-state formation of porphycenes: intersystem crossing versus sensitization mechanismsHaim Levanon, Moshe Toporowicz, Hanna Ofir, Richard W. Fessenden, Paritosh K. Das, Emanuel Vogel, Matthias Koecher, and Kakumanu PramodCite this: J. Phys. Chem. 1988, 92, 9, 2429–2433…
The interaction of oxygen with the surface of a Pt alloy containing ∼20 at. % of cobalt was studied by low-energy electron diffraction (LEED) and x-ray photoelectron spectroscopy (XPS). At this composition, cobalt was found to be randomly substituted in the Pt fcc lattice both in the bulk and at the surface. [111] and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution electron energy loss spectroscopic study of carbon dioxide adsorbed on rhenium(0001)M. Asscher, C. T. Kao, and G. A. SomorjaiCite this: J. Phys. Chem. 1988, 92, 10, 2711–2714Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Pub…
Their absorption spectrum of both single crystals and powdered samples of acetanilide (a model system for proteins) has been studied in the amide i region, where a narrow band has been identified as a highly trapped soliton state. The powder-sample spectra have been decomposed using four Lorentzian bands. A strong tem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer diffusion in melt blends of low and high molecular weightStanley F. Tead and Edward J. KramerCite this: Macromolecules 1988, 21, 5, 1513–1517Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://doi.org/…
20Cr–25Ni–Nb stabilised stainless steel is used in the advanced gas cooled reactors (AGR) as cladding for the UO2 fuel. Extensive studies have been made and are continuing in an attempt to understand the spallation of surface oxide from this steel and in this paper recent progress is surveyed. In particular, it is sho…
SUMMARY A simple heat transfer model is presented to show that convection from the cryogen to the specimen is the limiting step in rapid freezing of small samples for electron microscopy when the Biot modulus, which measures the ratio of convective to conductive heat transfer, ( hd / k ) < 1. In comparison to the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for strong interactions in proteins and enzymes. 2. Interactions of ions with the peptide link and with imidazoleMichael. MautnerCite this: J. Am. Chem. Soc. 1988, 110, 10, 3075–3080Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Publ…
An experimental procedure is proposed to enable analysis of H2 emission/consumption data obtained during temperature-programmed reduction (TPR) of a metal-supported catalyst. Using the methods described allows one to account for chemical processes other than reduction and thus remove their contribution from the TPR pr…
Abstract Neat poly(ether‐ether‐ketone) (PEEK) and carbon fiber reinforced PEEK (APC‐2) specimens were prepared using a variety of cooling rates to achieve a range of crystallinities. Amorphous specimens were exposed to a variety of fluids to determine the penetrant types which are able to strongly influence the materi…
Partial photoionization cross sections and angular-distribution asymmetry parameters have been determined for the Xe 4d and ``4p'' subshells in the photon-energy region of the 4d Cooper minimum (160 eV to 270 eV, to 520 eV for the 4d asymmetry parameter). The Cooper minimum is observed as a distinct cross-section mini…
The effect of nitrogen, which is one of the most important elements in duplex stainless steels (SSs), was investigated for resistance to pitting corrosion and stress corrosion cracking (SCC) in various environments. The increase in nitrogen content increases the resistance of the base metal, which results from the imp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly([1.1.1]propellane). A novel rigid-rod polymer obtained by ring-opening polymerization breaking a carbon-carbon .sigma.-bondArnulf Dieter SchlueterCite this: Macromolecules 1988, 21, 5, 1208–1211Publication Date (Print):May 1, 1988Publication History Published online1 Ma…
Abstract Dynamic or quasi‐elastic light scattering (LS) from polymers in solution arises from concentration fluctuations. With the aid of modern photomultipliers these can be followed as a function of time. A proper evaluation allows to study the center of mass motion and the dynamics of individual chains. The relevan…