Materials Literature
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The class of ‘‘facilitated’’ kinetic Ising models introduced in a recent letter is investigated in greater detail. An interpretation of the models in terms of relaxation processes in dense fluids is described. Various types of kinetic behavior are predicted for the different spin models: (A) Arrhenius temperature depe…
Leader peptidase cleaves the amino-terminal leader sequences of many secreted and membrane proteins. We have examined the function of leader peptidase by constructing an Escherichia coli strain where its synthesis is controlled by the arabinose B promoter. This strain requires arabinose for growth. When the synthesis…
A molybdenum containing austenitic steel was exposed in hydrochloric acid at various potentials in the active and passive ranges of the alloys. The surface compositions were analyzed by the ESCA technique. The influence of pretreatment by ion bombardment and mechanical polishing on the passivation behavior was investi…
The equations governing long-wavelength, low-frequency excitations in icosahedral quasicrystals are derived. It is found that while the speeds of the propagating modes are isotropic, the attenuations are not, implying that purely macroscopic experiments can in principle distinguish quasicrystals from crystals, glasses…
This work, a completion of which started in (1), studies the evolution of the mechanical flexural strain of different ranges of mortar samples of 1 X 1 X 6 cm (12 samples/ranges/age/solution) made with sulphoresistant portland cement (P-450-Y, according to RC-75), submerged in filtered drinking water and in the follow…
The study of the suitability of a material for its use as an active addition to the cement and, really, the evaluation of its puzzolanic capacity is a problem which is frecuently present. In this work, a line of behaviour to approach this problem is explained in a practical and definite way, pointing methods of possib…
The petrographical characterization of three spanish sandstones from Villamayor (Salamanca), Somió and Tazones (Asturias) is presented. The significance of the percentage and type of the clay minerals cementing the grains on the pore system geometry, for the rocks studied, is especially emphasized. Besides, correlatio…
In this work, classification and definitions of the additives used to produce concretes, mortars and plasters which base is cement, aim and application field of the UNE 83-200-84 norm (edited on December 1984) elaborated by Working Group n.º 2 "Additives" of the IRANOR Technical Commission n.º 83 "Concretes", are stud…
For the purpose to obtain data for a next revision of the Spanish Concrete Norm about the content of fines in sands fixed to date on 5 % without exceptions, an exhaustive research project has been undertaken. Following, the results of the influence of different contents of calcareous and clayey fines in mortar mechani…
This article, explains the necessary steps to obtained a quartz-low quantitative analysis in an anhydrous Portland cement matrix, by means of a simple addition of a little quantity of Corydon to the sample and applying a simple mathematical formula which gives directly the crystalline compound percentage which determi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymers in two dimensions: renormalization group study using three-parameter modelJack F. Douglas, Binny J. Cherayil, and Karl F. FreedCite this: Macromolecules 1985, 18, 12, 2455–2463Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Pub…
We have recently suggested an approximate computer simulation technique, based on the scanning method, which enables one to extract the entropy (and hence the free energy) of polymer chains from a relatively small sample. So far this technique has been discussed in terms of chains with excluded volume (EV); in the pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelations between chain parameters and failure characteristics of polymers below their glass transition temperatureShaul M. AharoniCite this: Macromolecules 1985, 18, 12, 2624–2630Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Publi…
The various forms of alteration presented in the monumental sandstones of the “Palacio de Revillagigedo” (Gijón, Spain) are identified, localized and studied. Among them, the alveolation phenomena (honeycomb erosion) stand aut; the morphologically different alveoles are described and their genesis interpreted.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe paramagnetic metal effect on the ligand localized S1 .apprx. .fwdarw. T1 intersystem crossing in the rare-earth-metal complexes with methyl salicylateSeiji Tobita, Masayuki Arakawa, and Ikuzo TanakaCite this: J. Phys. Chem. 1985, 89, 26, 5649–5654Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new crown heteropolyanion K28Li5H7P8W48O184.92H2O: synthesis, structure, and propertiesRoland Contant and Andre TezeCite this: Inorg. Chem. 1985, 24, 26, 4610–4614Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 Dec…
Two series of dental composites, along with the unfilled resin matrix, were examined to determine the effects of filler level and size on selected properties. Both series were prepared by incorporating a silanated barium borosilicate filler into a visible-light-activated polyphenylene polymethacrylate resin matrix. On…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInduction of peptide conformation at apolar water interfaces. 1. A study with model peptides of defined hydrophobic periodicityW. F. DeGrado and J. D. LearCite this: J. Am. Chem. Soc. 1985, 107, 25, 7684–7689Publication Date (Print):December 1, 1985Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the chromium-catalyzed epoxidation of olefins. Role of oxochromium(V) cationsE. G. Samsel, K. Srinivasan, and Jay K. KochiCite this: J. Am. Chem. Soc. 1985, 107, 25, 7606–7617Publication Date (Print):December 1, 1985Publication History Published online1 May 2002…