Materials Literature
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Abstract To combat the problem of specimen charging when analysing insulators with a high energy monochromatic AgLα x‐ray source for XPS in the VG ESCA3, the application and use of a low energy electron flood gun is investigated. It is found that individual specimens can require widely differing ‘optimum’ conditions f…
Abstract The approximate maximum and minimum amounts of any phase in a complex mineral mixture can be determined by solving a linear programming problem involving chemical mass balance and X-ray powder diffraction (XRD) data. The chemical information necessary is the bulk composition of the mixture and an estimation o…
Abstract Water vapor transmission rates can be reduced by as much as 50% in polyethylene by using talc as a filler. The oxygen permeability as well as water vapor transmission rates are similarly reduced by talc in nylon 6 films. The films show low elongation at break and reduced breaking strenth in the presence of ta…
Corrosion of a multi-phase Ag-Pd-Cu-Au-based commercial dental casting alloy and a Cu-Pd-rich and Ag-rich single-phase alloy was studied by open-circuit potential measurements, atomic absorption spectrometry, and electron spectroscopy. The alloys were immersed in an artificial saliva solution for 24 hr while the open-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal stability of aviation kerosines: techniques to characterize their oxidation propertiesDavid R. Kendall and John S. MillsCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 2, 360–366Publication Date (Print):June 1, 1986Publication History Published online1 May 2002P…
Countermeasures to biofouling in simulated ocean thermal energy conversion heat exchangers have been studied in single-pass flow systems, using cold deep and warm surface ocean waters off the island of Hawaii. Manual brushing of the loops after free fouling periods removed most of the biofouling material. However, ove…
The determination of the dielectric and polarization behavior of silicate minerals is important in the understanding of chemical bonding and the evaluation of interionic potentials in model calculations. The analysis of crystal-defect energetics and the atomistic theory of diffusion processes rely heavily upon the pol…
Experimental investigations in the field of longitudinal wave propagation in beams are plentiful; however, experimental studies of flexural wave propagation problems are scarce and are restricted mainly to uniform and infinite structures where the effects of reflected waves are not generally included. This review is m…
The largest discrete iodocuprate(I) ion observed so far has been identified in the compound (pyH) 2 [Cu 3 I 5 ]. 36 CuI tetrahedra are linked through common edges to form a highly symmetrical polyanion [Cu 36 I 56 ] 20⊖ with the extremely rare symmetry 432 (O).
We obtained forces on 3.0 and 6.0 CRH, ogival-nosed projectiles penetrating a simulated geological target. A gas gun and a powder gun accelerated foundry core targets (a simulated soft sandstone) to steady velocities between 0.6–2.1 km/s, and the targets subsequently impacted 20.6 mm diameter penetrators. Rigid-body m…
Abstract Earlier studies by differential scanning calorimetry showed anomalous behavior of T g with varying amounts of dioctyl phthalate, while by dynamic mechanical analysis 2 T g 's were found over a limited concentration range. In this study, two adjacent T g 's were found over the complete range of concentrations…
Abstract The dehydration temperature of K-montmorillonite, obtained by ion exchange of a Na-mont-morillonite, was determined at pressures to 2 kbar, using high-pressure differential thermal analysis. Dehydration reactions were found at about 50° and 100°C above the liquid-vapor curve of water. At pressures above the c…
In order to investigate the microscopical aspects of the SMSI state in catalysts we performed photoemission experiments on samples consisting of submonolayer Pt deposits on a Ti(0001) surface and on a TiO2 thin film. Annealing Pt/TiO2 samples at ∼500 °C caused a change in the electronic structure of Pt atoms which was…
Samples in the (Ni x Cu 1‐x )O system, 0.5 ≤ x ≤ 1.0, have been examined using powder X‐ray diffraction and high‐temperature Solution calorimetry. According to the X‐ray characterization samples form a one‐phase rock salt solid solution up to x = 0.30, and crystallize with a tetragonal structure at x = 0.35. The entha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacroporous gels. 1. Polymerization of trimethylolpropane trimethacrylate in tolueneJ. E. Rosenberg and P. FlodinCite this: Macromolecules 1986, 19, 6, 1543–1546Publication Date (Print):June 1, 1986Publication History Published online1 May 2002Published inissue 1 June 1986ht…
ABSTRACT The mechanism of the formation of a rigid foam structure during whipping of reconstituted whipping cream was investigated. The rheological properties of whipped cream were estimated from an analysis of shear creep curves by a four element model. The values of each element increased exponentially during the pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElucidation of the mechanism and kinetics of the silicon, aluminum ordering process in synthetic magnesium cordierite by silicon-29 magic angle spinning NMR spectroscopyColin A. Fyfe, Gian C. Gobbi, and Andrew. PutnisCite this: J. Am. Chem. Soc. 1986, 108, 12, 3218–3223Publi…
Abstract Resonance Raman, ESR and visible absorption spectra have been observed at room temperature for the 4, 4′‐bipyridine radical anion in tetrahydrofuran and for 4, 4′‐bipyridine adsorbed on metallic potassium. Based on the quinoid structure of the radical anion, as predicted by the MO theory, a normal coordinate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the reduction of ketones by trialkylsilane. Hydride transfer, SET-hydrogen atom abstraction, or free radical additionD. Yang and D. D. TannerCite this: J. Org. Chem. 1986, 51, 12, 2267–2270Publication Date (Print):June 1, 1986Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexanuclear tungsten cluster structures: tetradecachlorohexatungstate(2-), tetradecabromohexatungstate(2-), and tetradecaiodohexatungstate(2-) relevance to unusual emissive behaviorThomas C. Zietlow, William P. Schaefer, Behzad Sadeghi, Nhi Hua, and Harry B. GrayCite this: I…