Materials Literature
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The authors previously reported that polyunsaturated fatty acids having 1, 4-diene structure can be easily conjugated at ordinary temperature using iodine as a photosensitizes.This paper describes the optimum conditions for the iodine-sensitized conjugation of methyl linoleate under irradiation with a 100W high-pressu…
Diatoms (Bacillariophyceae) from Nostra pond (Cumbres Calchaquies), Tucu man province, Argentine). The diatomologic association found in the sediment of the bottom of Nostra pond (4300 m over s.l.) is analysed. Thirty one taxa have been identified including species, varieties and formae, fo which the dominant ones wer…
The X-ray elastic constants of composite ceramics of zirconia mixed with 40wt% alumina were determined by X-ray stress measurements and compared with theoretical predictions. The results obtained are summarized as follows:(1) The X-ray elastic constants were determined for the diffraction from Al2O3 (146) plane by Cu-…
Infrared spectra are reported of Fe/Al2O3, Fe/SiO2 and K2O, Al2O3 and doubly promoted Fe/SiO2 after treatment at 298–723 K in a gaseous mixture of carbon monoxide and ammonia. Product species included isocyanate groups on iron, surface cyano complexes on iron and isocyanate groups either on the oxide supports or invol…
The catalytic activity for the oxidation of CO with molecular oxygen of silver catalysts containing large silver particles (ca. 1 µm) has been studied. Both pure and caesium-promoted silver catalyst were investigated. The various pretreatments to which the catalysts were subjected, i.e. reduction or oxidation at diffe…
Until the mid-1960's, procedures for studying shell microstruetures were laborious and, for many purposes, unsatisfactory. Depositional surfaces were observed with binocular microscopy, and shell material was embedded in various media, sectioned, mounted on a glass slide, and observed with ordinary light and polarized…
Abstract This article describes procedures for producing powder metallurgy high-speed tool steel powder by inert-gas atomization, followed by compaction by hot isostatic pressing. These include the anti-segregation process (ASP) and the crucible particle metallurgy (CPM) process. The article reviews the properties of…
Many bacterial clustered regularly interspaced short palindromic repeats (CRISPR)–CRISPR-associated (Cas) systems employ the dual RNA–guided DNA endonuclease Cas9 to defend against invading phages and conjugative plasmids by introducing site-specific ...Read More
The metallurgical structures which control the resistance to embrittlement of weld regions of heavy-wall hydrotreatment reactor vessels are described in this paper. Specifically, the control of notch toughness properties of heavy-section submerged-arc narrow-gap welds in 2.25 Cr-1 Mo steel after post-weld heat treatme…
Spectroscopy on the new laser host crystal NaYF4 doped with Nd indicates that this host has both strong broad absorption bands suitable for diode pumping and an integrated cross-section higher than that of YAG. Ho:NaYF4 shows similar properties with broad emission bands suitable for tunable laser operation.
It has been considered that products with particular crystal structures, such as unidirectionally solidified columnar grains, a single crystal and an in-situ composite eutectic structure, can be manufactured with an upward continuous casting process. In this work, after surveying various upward continuous casting proc…
Specimens of Naval brass and 70–30 and 90–10 copper-nickel were monitored using the polarisation resistance method during lengthy exposure to flowing sea water that was intermittently contaminated with sulphides. Exposure of the 90–10 or 70–30 alloys to sulphides delayed or prevented the development of a protective fi…
Abstract Molecular weight has a considerable influence on the mechanical properties and density of polytetrafluoroethylene. Empirical equations have been found relating tensile properties and density to the number‐average molecular weight.
We perform a linear stability analysis of the periodic crenellated front profiles which provide an amplitude threshold for the cellular instability of a faceted directional solidification front [1]. This analysis assumes that facets are much longer than curved parts of the front (risers). We show that, while the crene…
Developments in electrolytic tin plate, tin-free steel and more recent low tin materials are described with emphasis on their corrosion performance and their applicability to the newer can manufacturing processes. The significance of tinplate special property tests and their relative importance are discussed as relate…
ABSTRACT THE effect of physical properties, i.e., initial bulk density and moisture content, on stress-strain behavior of wheat en masse was studied for axial and isotropic compression loadings. Dependence of fourteen Lade elastoplastic constitutive model parameters on three initial bulk densities and two moisture con…
An adiabatic scanning calorimeter has been used to investigate the temperature dependence of the enthalpy and the heat capacity near phase transitions in the cholesteric liquid crystal cholesteryl oleate (CO). It is found that the blue phases in CO are thermodynamically stable and that the observed enthalpy difference…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural order and orientation of organometallic pillars on synthetic fluorhectorite and montmorillonite surfacesFaina Tsvetkov and John WhiteCite this: Chem. Mater. 1989, 1, 1, 149–158Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Pu…
This study examines the effect of seven dry cleaning products, several of which have been used in paper consetvation, on cotton canvas. The changes in surface pH, color, brightness, and surface texture of aged and unaged samples of no. 10 cotton duck due to treatment with these products are obsetved. The composition o…
The chemical composition of the untreated palm-press fibres was estimated to be 39.9% cellulose, 28.9% hemicellulose, 20.3% lignin and 3.6% ash content. The concentrations of the chemicals used in the treatment of the fibres were 1.5% each of NaOH, Ca(OH)2' KOH, Na2COy 5.0% CO(NH)2 and aqueous ammonia solution. Of the…