Materials Literature
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The investigation identifies the two main types of pollen sedimentation in the Rhône delta, and presents synthetic pollen spectra in terms of ecological groups in order to predict the pollen source areas. Two different domains are studied: the lagoonal zone occupied by the Vaccarès where atmospheric pollen imput predo…
This paper presents experimental and theoretical results to explain the phenomenon of sudden flashover on artificially contaminated nonceramic insulators. A sudden flashover in this paper is defined as a flashover occurring on a partially contaminated insulator, and which is preceded by little or no surface discharge…
Recently there has been substantial interest in the formation of transient Fe-Al interfacial layers during hot-dip galvanizing and galvannealing. These layers delay the formation of Fe-Zn intermetallic compounds by preventing the interdiffusion of Zn and Fe. Despite the industrial importance of this inhibition phenome…
In situ silica reinforcement of styrene–butadiene rubber (SBR) has been achieved by a sol–gel process using tetraethoxysilane (TEOS). SBR was sulfur-cured and the sol–gel reaction of TEOS was carried out in TEOS or in a TEOS–tetrahydrofuran (THF) mixture. The in situ silica was filled homogeneously in the rubber matri…
Raman spectra of the following binary molten salt systems have been measured: (a) YBr 3 –ABr (A = Li, K, Cs) at temperatures up to 920 °C and at different compositions; (b) YF 3 –KF at temperatures up to 1000 °C and compositions up to 50% YF 3 . The spectral changes occurring upon melting of Cs 2 NaYBr 6 , YBr 3 and K…
Design of cast blasting rounds and optimization of the blasting process has taken on a new and much greater importance with the emergence of overburden casting operations involving thousands of tons of explosives in each blast. This paper addresses the fundamentals of blast design and optimization for explosive fragme…
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Abstract Some properties of the tensor algebra on manifolds are discussed with respect to the classical tensor algebra of continuum mechanics. Basic definitions and relations of linear maps are briefly recalled and applied to tensor spaces, where special attention is focused to the definition of dual and transposed ma…
Recent studies have proposed that a near-interface conformation of PMMA in PMMA/metal substrate systems is different from the bulk polymer. High-resolution XPS analysis using monochromated X-ray sources has shown that PMMA interactions with metal oxide substrates are determined by the acido-basic nature of the substra…
Some solid-state pharmaceutical properties and the solid-state thermal stability of the model dipeptides aspartame (APM) and aspartylphenylalanine (AP), have been investigated. Studies by differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), high-performance liquid chromatography, powder X-ray d…
The effect of applied hydrostatic pressure (up to 275 MPa) on the photophysical properties of the cuprous iodide cluster Cu 4 I 4 py 4 ( I ) in room temperature solutions has been examined. Although there was little pressure effect on emission spectra or lifetimes under conditions where the solutions remained fluid, d…
Core-level binding energies of the component metals in bimetallic clusters of various compositions in the Ni−Cu, Au−Ag, Ni−Pd, and Cu−Pd systems have been measured as functions of coverage or cluster size, after having characterized the clusters with respect to sizes and compositions. The core-level binding energy shi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Study of Poly(hydroxyalkanoate)s by Quantitative 31P NMR Spectroscopy: Molecular Weight and Chain CleavageA. Spyros, D. S. Argyropoulos, and R. H. MarchessaultView Author Information Department of Chemistry and Pulp and Paper Rese…
A series of cobalt–zinc hydroxycarbonate precursors with nominal Co/Zn atomic ratios of 0/100, 10/90, 20/80, 30/70, 40/60, 50/50, 70/30, 90/10 and 100/0 have been synthesized from their mixed metal nitrates and ammonium carbonate by a coprecipitation route. X-Ray and electron diffraction studies of the precursors reve…
R. Anwander and R. Roesky, J. Chem. Soc., Dalton Trans., 1997, 137 DOI: 10.1039/A607391C
The kinetics of the reaction for the formation of monocalcium aluminate (CaAl 2 O 4 ) using 1:1 molar mixtures of A.R. grade calcium carbonate and A.R. α-Al 2 O 3 or gibbsite have been investigated in the range 1150–1400 °C using quantitative X-ray diffraction analysis. The phases Ca 3 Al 2 O 6 and Ca 12 Al 14 O 33 we…
Complexes 1a·EuIII and 1b·EuIII, but not 1a·TbIII and 1b·TbIII, display strong ‘off–on’ switching of delayed luminescence with alkali cations; the switching efficiency of 1b·EuIII is stronger with K+ rather than Na+.
Materials combining the best properties of plastics and ceramics , i.e., that are as heat and combustion resistant as ceramics and as moldable and light as plastics, would find many applications. As a step in this direction, the preparation and properties of a silicon‐based organic polymer, MSP, which includes the Si(…
A scanning electrochemical technique is used to show the influence of differential aeration on the kinetics and mechanism of corrosion reactions occurring at the exposed edge of galvanised sheet steels overcoated with organic layers of dissimilar thickness.
A layered double hydroxide (LDH) with chemical composition LiAl2(OH)7 ·2H2O was prepared via a wet chemical route of gel to crystallite (G–C) conversion at 80 °C involving the reaction of hydrated alumina gel, Al2O3 ·yH2O (80<y<120) with LiOH (Li2O/Al2O3 ≥0.5) in presence of hydrophilic solvents such as ethanol under…