Materials Literature
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In this paper an anomalous form of long term corrosion behaviour observed in mild steel exposed to some atmospheres in Spain is described. In such atmospheres corrosion kinetics of the steel wasfound to deviate from the behaviour predicted by the well known bilogarithmic law. The authors speculate on the plausible cau…
A crystal structure determination on the monocaesium derivative of bis(homooxa)-p-tert-butylcalix[4]arene (L2), [Cs(L2– H)(OH2)3]·xH2O (x≈ 3)[orthorhombic, Pmnb, a= 26.666(5), b= 15.928(4), c= 11.499(9)Å, Z= 4, R= 0.071 for 1500 ‘observed’ reflections] showed that the caesium may be considered to be involved in polyha…
The standard enthalpies of formation of YB2, TaB2, and W2B5 have been determined by direct synthesis calorimetry at 1473 ± 2 K. The following values are reported: [math] (YB2) = -35.7 ± 2.6 kJ/g.atom; [math] (TaB2) = -53.3 ± 2.0 kj/g.atom; [math](W2B5) = -17.5 ± 1.1 kJ/g.atom. Two new techniques which facilitate compl…
We studied chemical kinetics of weathering in the humus horizons of young Andisols from northeastern Japan. Since there is no idealized chronosequence of Andisols, we selected eight pedons that have many similarities in the properties of parent material, soil moisture regime, vegetation, drainage, etc., but show signi…
A statistical analysis of the atomic environments of arginine side chains from 62 high resolution protein structures has been made. Using the definition of F.M. Richards (J. Mol. Biol., 82, 1-14, 1974), the protein data set was subdivided into 19 different atom types and their propensities to form atom contacts with t…
In this paper the possibility is demonstrated of producing microalloyed steels with Ti, V and Nb using electrodes composed of finished steels freely available on the open market. The addition of ferroalloys to the slag pool was carried out at intervals of 1 min and it was confirmed that this interval was sufficient to…
The absorption of plasma proteins is an important event at the blood-material interface, and strongly affects subsequent cellular interaction and thrombus formation. Although considerable efforts have been expended to elucidate the mechanism of protein adsorption and the role of absorbed protein layer at the blood-mat…
A new linear trinuclear copper(II) co-ordination compound of the formula [Cu3(H2ahmt)6Cl4]Cl2, where H2ahmt = 4-amino-3,5-bis(hydroxymethyl)-1,2,4-triazole, has been synthesized. The crystal and molecular structure has been solved at 298 K by single-crystal X-ray analysis. The compound crystallizes in the triclinic sp…
Abstract Thermoplastic polyurethane elastomers (TPUs) based on 4,4′‐methylene‐diphenyl diisocyanate, poly(tetramethylene glycol), diamine‐terminated aliphatic nylon oligomer, and 1,4‐butanediol were synthesized by two different polymerization methods, i.e. one shot and prepolymer methods. The effects of the polymeriza…
Abstract Comments are made on some existing classification systems of the Cryptophyceae. A new system is also proposed. This allows for the existence of three orders, four families, seven pigmented genera and two colourless ones. Formal diagnoses are given of the Cryptophyceae classis emendata, Pyrenomonadales ord. no…
Luminescent platinum porphyrins with halogen substituents on the meso-aryl and pyrrole rings Pt(TDCPP), Pt(TFMPP) and Pt(Br8TMP)[TDCPP =meso-tetra(2,6-dichlorophenyl)porphyrin, TFMPP =meso-tetra(3,5-bis(trifluoromethyl)phenyl)porphyrin, Br8TMP =meso-tetramesityl-β-octabromoporphyrin] were immobilized inside silicone r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProbe diffusion in polymer solutions under .THETA. and good conditionsGeorge D. J. Phillies and Delphine ClomenilCite this: Macromolecules 1993, 26, 1, 167–170Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 19…
1. Introduction. 2. Outline of the Theory of Compacting and Briquetting Fine-Grained Materials. 3. General Classification of the Methods and Machines for Compaction and Consolidation of Fine-Grained Materials. 4. The Process of Compaction and Pressing of Selected Fine-Grained Materials under Static Pressure in Stamp (…
A family of rigid tetrahedral molecules based on tetraphenylmethane has been synthesized. The primary preparative chemistry involved Suzuki coupling. Reactions typically proceeded in good yields providing synthetic entry to tetrahedral building blocks for molecular engineering of architecturally regular macromolecular…
The preparation of aluminium nitride from organometallic or polymeric precursors is reviewed, including reaction conditions for the synthesis of various intermediates and their transformation into aluminium nitride, and examples of structural characteristics and processing features. Organoaluminium and organonitrogen…
Abstract This article addresses consumable selection and procedure development for the welding of stainless steels. The WRC-1992 diagram and the Schaeffier diagram, are used to illustrate the rationale behind many filler-metal choices. The article discusses the basic metallurgy and base metals of five major families o…
A method for the automated and accurate calculation of the winding eddy losses, as well as the stray losses in the tank walls, core support frame, lockplates, and the core laminations in core-form power transformers is described. Comparisons between this method, test values, and other analytical results are presented…
The behaviour of polymer dispersed cholesteric droplets in electric fields has been investigated for materials with both negative and positive dielectric anisotropy. Microscopic observations parallel and perpendicular to the electric field were performed. In materials with εa < 0, the cholesteric pitch remains constan…
The solid–liquid phase behaviour of binary and ternary mixtures containing water, sucrose and glycine has been studied by differential scanning calorimetry. In addition to defining the liquidus and solidus coexistence boundaries, the studies have been extended to the measurement of glass transitions of amorphous binar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(thiophosphazenes): new inorganic backbone polymersHarry R. Allcock, Jeffrey A. Dodge, and Ian MannersCite this: Macromolecules 1993, 26, 1, 11–16Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https:/…