Materials Literature
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In this paper we present the results obtained in the studies carried out on evolution of the compressive strength of identical concretes made with different types of cements based on the spanish standard UNE 80 301 when they are subjected to critical temperatures (5 °C and 35 °C), compared with the same concretes cure…
Three different types of nickel oxide electrochromic films are colored and bleached in 1 M KOH solution: porous NiO prepared by anodic oxidation of nickel, NiO ( OH ) x obtained by reactive evaporation, and Ni ( OH ) 2 cathodically deposited. Their crystallographic and chemical identification in the colored and bleach…
We present the results of a molecular-dynamics study on a Lennard-Jones mixture. Measurements of density and bond-angle correlation functions show that the answer to the question posed in the title is NO. We also show that icosahedral order plays no special role in the glass transition, but that a normalized measure o…
Abstract The chemical composition of about 500 diagenetic chlorites, determined by electron microprobe, has been studied in six different sedimentary sequences spanning conditions from early diagenesis to low-grade metamorphism, in the temperature range 40–330°C. The range of Fe/(Fe + Mg) is almost complete and is pos…
This lecture initially presents the results of systematic research performed to interpret the mechanisms of corrosion inhibitors in various environments. The behavior of several series of S-containing and N-containing compounds has been investigated by radiochemical, electrochemical, gravimetric, and micrographical te…
The energetics of nickel clusters over a broad size range are explored within the context of the many-body potentials obtained via the embedded atom method. Unconstrained local minimum energy configurations are found for single crystal clusters consisting of various truncations of the cube or octahedron, with and with…
The glass-transition temperatures, Tg, of organic liquids confined to small pores were studied by differential scanning calorimetry (DSC). The Tg was measured as a function of pore size in controlled pore glasses (CPG) having pore diameters in the range of 40–730 Å. The surface of the glass was treated with hexamethyl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-step synthesis of hyperbranched dendritic polyestersC. J. Hawker, R. Lee, and J. M. J. FrechetCite this: J. Am. Chem. Soc. 1991, 113, 12, 4583–4588Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophobic effects on simple organic reactions in waterRonald BreslowCite this: Acc. Chem. Res. 1991, 24, 6, 159–164Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs.acs.org/doi/10.1021/ar00006a001ht…
The storage of electrochemical energy in battery, "supercapacitor," and double‐layer capacitor devices is considered. A comparison of the mechanisms and performance of such systems enables their essential features to be recognized and distinguished, and the conditions for transition between supercapacitor and "battery…
Stereochemical studies of three pyridoxal phosphate dependent decarboxylases and serine hydroxymethyltransferase have allowed the dispositions of conjugate acids that operate at the C alpha and C-4' positions of intermediate quinoids to be determined. Kinetic work with the decarboxylase group has determined that two d…
Analysis of the mechanism and structure of lactate dehydrogenases is summarized in a map of the catalytic pathway. Chemical probes, single tryptophan residues inserted at specific sites and a crystal structure reveal slow movements of the protein framework that discriminate between closely related small substrates. On…
The determination of three separate gamma-chymotrypsin structures at different temperatures and resolutions confirmed the presence of electron density in the active site, which could be interpreted as an oligopeptide as had previously been suggested by Dixon and Matthews [(1989) Biochemistry 28, 7033-7038]. HPLC analy…
Low-temperature phase transitions and twin-domain structure of (NH4)3H(SeO4)2 studied by the electron paramagnetic resonance of Cu2+, VO2+ and SeO3-, Wu Ching-Jiun, Yu Jiang-Tsu, Tsai Mei-Na, Lou Ssu-Hao
Raman scattering was used to study optical phonons in a Si12Ge4 strained-layer superlattice on c-Si(001) that was subjected to hydrostatic pressure at room temperature. The change of phonon frequency with pressure, dω/dP, for the principal quasi-confined LO mode in the Ge layers, is found to be significantly smaller t…
The anisotropic thermal conductivity of ${\mathrm{Al}}_{65}$${\mathrm{Ni}}_{20}$${\mathrm{Co}}_{15}$ and ${\mathrm{Al}}_{62}$${\mathrm{Si}}_{3}$${\mathrm{Cu}}_{20}$${\mathrm{Co}}_{15}$ single quasicrystals has been measured. While a nearly isotropic phonon contribution was observed, the electronic thermal conductivity…