Materials Literature
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Abstract A new method based on the inversion of a relation derived by Krathy, and thereby allowing the determination of the orientation distribution function of amorphous polymers by Wide Angle X‐Ray Scattering (WAXS), is described. With a simple approximation, in many cases disturbing intramolecular scattering can be…
Oscillations of the steady-state rate of catalytic CO oxidation on clean Pt surfaces were observed under low-pressure conditions and are related to the adsorption properties of the reactants. Evidence is presented for a model in which the reversible (5\ifmmode\times\else\texttimes\fi{}20)\ensuremath{\rightleftarrows}(…
The basic theoretical considerations involved in developing instruments for electron spectroscopy for atoms and solids are discussed. To be competitive with x-ray emission or absorption spectroscopy methods, electron spectroscopy would have to achieve such high resolution that well-defined electron lines would be obta…
Abstract The mechanical properties (the moduli and collapse strengths) of three dimensional cellular solids or foams are related to the properties of the cell wall, and to the cell geometry. The results of the analyses give a good description of a large body of data for polymeric foams.
Various para substituted poly-N-arylpyrrole polymer films were prepared and their electrochemical properties were measured. Of particular interest are the poly-N-p-nitrophenylpyrrole films which can be oxidized to produce the polypyrrole cation and reduced to produce the nitrophenyl anion. The polymer films can be rep…
A new method for accurate measurement of penetration depth ( R ) of electrons with various energies in materials was examined, using an irradiation effect in both aluminum and LiF crystals. The results obtained are summarized as follows: a) The value of R markedly decreases with the increasing energy of electrons used…
A critical assessment of the extensive data from published direct measurements of the permeability or permeation constant of hydrogen and its isotopes in iron, iron-base alloys, stainless and ferritic steels is presented.
Summary Authigenic albite occurring as euhedral overgrowths up to 400 μm in size is a characteristic feature of the Pendleside Limestone in the Craven Basin of northern England. The albite is very pure, low-albite in keeping with other authigenic albites in carbonate rocks. The detrital cores of the albites are angula…
Glow curve shape and thermoluminescence (TL) sensitivity in LiF:Mg,Ti single crystals have been studied as a function of Mg2+ and Ti3+ concentrations. A detailed method for TL optimization is presented, along with a simplified scheme which relies on the ratio of peak 5 height to peak 4 height (or ratio of peak 5 to pe…
Abstract N,N′-Bis(1-methyl-3-oxobutylidene)ethylenediaminato-1,3-di-4-pyridylpropaneiron(III) tetraphenylborate was synthesized and the temperature dependences of the Mössbauer spectrum and magnetic susceptibility for the compound were measured. The fact that the electronic relaxation between 6A1 and 2T2 states is fas…
Abstract Expansion of the porphyrin π-system by peripheral substitution lowers the oxidation potential of the macrocycle and increases the photocurrent quantum yield obtained when the porphyrin is used as sensitizer in a photocell. Tetrabenzporphyrins fall among the most efficient porphyrin sensitizers studied so far…
Pressure vessels for coal conversion processes are likely to be made of a 2 1/4 Cr-1Mo steel, covered by ASTM specification A387, class 2, grade 22. Under the projected operating conditions, degradation of the mechanical properties of the steel by temper embrittlement and hydrogen embrittlement is a major concern. The…
Several fluoroalcohols have been prepared by the free-radical addition of methanol, ethanol and isopropanol to such fluoro-olefins as C3 F6, CFH[dbnd]CF-CF3, (CF3)zCFCF[dbnd]CFCF3 and H(CF2)4CF[dbnd]CF2. Proper experimental conditions for their synthesis are described. Owing to their strong tendency to form hydrogen b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectra of inorganic molecules. 31. Satellite structure associated with the core-electron binding energies of alkyl and aryl isocyanide complexes of the transition metalsW. S. Mialki and R. A. WaltonCite this: Inorg. Chem. 1982, 21, 7, 2791–2796Publicatio…
Efficiency loss due to high electron beam current density in green‐emitting phosphors has been measured for Cu and Al concentrations ranging from 27 to 1500 ppm. The severe loss of efficiency exhibited by commercial phosphors with activator concentrations in the 20–75 ppm range is somewhat alleviated at higher concent…
Abstract Results are presented for the relaxation of the nuclear magnetization via quadrupolar inter-actions caused by the dynamics of point-like lattice defects in cubic solids. For systems with nuclear spins I = 3/2, several aspects of the lineshape function of the absorption signal are con-sidered. The treatment in…
To determine a stress distribution due to ball-point scratching, we have observed, using a scanning electron microscope, domain structures on the top and bottom surfaces at 3% Si-Fe single crystals with orientation near
Proposes a formalism which allows one to consider the whole reflected waves at the interfaces of an helical pile of transparent plates with rectilinear birefringence (Reusch pile). This formalism is applied to a half infinite pile, illuminated in the direction of the screw axis by monochromatic plane and uniform waves…
Abstract Product composition of polyglycerol esters, prepared from a direct alkaline polymerization of glycerol followed by esterification with stearic or oleic acids, has been studied. The internal product composition, as analyzed by high performance liquid chromatography (HPLC), shows clearly that in contradiction t…
Abstract Für verschiedene Proben von Polyethylen wurden die Dicken der Lamellen durch photometrische Ausmessung von elektronenmikroskopischen Aufnahmen höherer Vergrößerung bestimmt. Es werden Werte für das Lamelleninnere, die Gesamtdicke der Lamelle, eine mittlere Lamellendicke und die Grenzschichtdicke angegeben. Ei…