Materials Literature
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Qualitative X-ray microanalysis of biological specimens requires an approach that is somewhat different from that used in the materials sciences. The first step is deconvolution and background subtraction on the obtained spectrum. The further treatment depends on the type of specimen: thin, thick, or semithick. For th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn-plane structure of underpotentially deposited copper on gold(111) determined by surface EXAFSO. R. Melroy, M. G. Samant, G. L. Borges, J. G. Gordon II, L. Blum, J. H. White, M. J. Albarelli, M. McMillan, and H. D. AbrunaCite this: Langmuir 1988, 4, 3, 728–732Publication D…
Annealing of polymers below the glass transition temperature results in a decrease in enthalpy that is recovered during heating. The enthalpy recovery is visible as an endothermic peak in a differential scanning calorimetry (DSC) scan. The position of this peak depends on the thermal treatment given and on the structu…
The analytical function of crack extension to a fractional power is used to represent the fracture resistance of a vitreous‐bonded 96% alumina ceramic. A varying flaw size, controlled by Vickers indentation loading between 3 and 300 N, was placed on the prospective tensile surfaces of four‐point bend specimens, previo…
The use of an arterial prosthesis with a tapered lumen has several important advantages; for example, improved stability of flow, increased wall shear and better matching of its size with that of the host vessel. Tapering may, however, lead to increased energy losses, particularly if the angle of taper is large and th…
Based on the concept of bond polarizabilities the optical properties of a crystal are traced back to the orientation of its bonds and to the individual bond parameters \bar \betaand Δβ. A test with various sulfate compounds shows that the average bond parameters \bar \beta describe the average refractive indices with…
The crystal and magnetic structure of Ga substituted MnAl alloys has been investigated by neutron diffraction. Gallium atoms are found to occupy both the (0,0,0) and ( (1)/(2) , (1)/(2) , (1)/(2) ) crystallographic sites [differently from Al which occupy ( (1)/(2) , (1)/(2) , (1)/(2) ) sites] and have a preference for…
We have used photoemission spectroscopy with synchrotron radiation in the energy range hν=40–140 eV to study the interface formation of Ag overlayers on cubic SiC(100). Our data are consistent with a three-dimensional island growth mode of Ag at room temperature. The substrate attenuation curve supports a model of red…
Nuclear reaction data for the doubly differential cross sections of inelastic electron scattering and of electronucleon and electropion production are parametrized by analytic models of the major reaction mechanisms. Predictive FORTRAN codes for the yields of reaction products have been developed for all nuclei intera…
Rubber compounding: principles, materials, and techniques , Rubber compounding: principles, materials, and techniques , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
The effect of the nickel content on the pitting resistance of AISI(1) 304 stainless steel (SS) and Alloys 800 and 600 in chloride-thiosulfate solutions was investigated using two techniques, scratching and slow-stepped potentiostatic polarization. Adverse effects of nickel were seen at both low and high thiosulfate co…
The interdiffusion of Cu and Si was studied using ion scattering spectrometry (ISS) and x-ray photoelectron spectroscopy (XPS). The samples were prepared in very high vacuum (VHV) by evaporating Cu onto Ar+-cleaned and -annealed Si(111) surfaces. The surfaces were transferred directly from VHV to UHV and analyzed by I…
Stresses in oxide scale–metal systems can lead to decohesion of the scales when critical values are exceeded, which manifests itself in stable growth of interfacial cracks and separation along the scale/metal interface or in sudden spalling of the scale or of parts of it as a result of unstable cracking processes. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic and structural studies on the novel nitrogen ligand 2,5,8,10,13,16-hexaazapentacyclo[8.6.1.12,5.09,18.013,17]octadecane and its reaction products with methanolic cadmium halogenide solutions: Ci-C12H22N6, [CdX2(C2-C12H22N6)] (X = Cl, Br, I), and [CdI2(C12H23N6OCH3)…
Abstract— In connection with the use of red light‐photosensitizers for photodynamic therapy, the redox reactivity of excited metallophthalocyanines (M = Al, Ga) was investigated by flash photolysis in order to establish whether photooxidations proceed by Foote's mechanisms I or II. Aminoacids (tryptophan, tyrosine) we…
The temporal evolution of the velocity field of an unsteady fluid flow can be tracked by combining particle image velocimetry and high speed photography. We used this technique to investigate the flow around cavitation bubbles during their collapse near a solid boundary. The light source was an argon laser with an ext…
Abstract Studies of a wide variety of modern and fossil skeletal carbonates indicate they all contain water in amounts ranging from a few tenths of one percent to as much as three percent by weight. The word water is used as a general term to include all inorganic liquid and bound H 2 O and OH (super -) . Reflectance…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence enhancement from Langmuir-Blodgett monolayers on silver island filmsR. Aroca, Gregory J. Kovacs, C. A. Jennings, R. O. Loutfy, and P. S. VincettCite this: Langmuir 1988, 4, 3, 518–521Publication Date (Print):May 1, 1988Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRearrangement through Berry pseudorotation and olefin insertion of d8 five-coordinate Rh(H)(C2H4)(CO)2(PH3). An ab initio MO studyNobuaki. Koga, Su Qian. Jin, and Keiji. MorokumaCite this: J. Am. Chem. Soc. 1988, 110, 11, 3417–3425Publication Date (Print):May 1, 1988Publicat…
Abstract Palladium oxide was detected by XPS and IR (Attenuated Total Reflection) analysis of the surface of a Pd electrode which was polarized in the medium 1 M KOH. This oxide set a peak of Pd 3d 5/2 shifted 3.5 eV with respect to the metal which is a much higher value than those reported and obtained for PdO and Pd…