Materials Literature
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This paper describes how the compensation law can be explained by a linear relation between the activation entropy and enthalpy of a given process in a polymer. These two variables are related by the thermal expansion coefficient and a constant approximately equal to the Rao acoustical parameter. A relation between th…
Austenitic Fe-16 wt.% Cr-20-45 wt.% Ni alloys have been studied by electrical resistivity measurements during 21K electron irradiation and during subsequent anneals. The Frenkel-pair resistivity and the activation enthalpy for interstitial and vacancy migration have been evaluated in the 16-45 alloy. An increase in ni…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplications of topological electron-counting theory to polyhedral metal clustersBoon K. Teo, G. Longoni, and F. R. K. ChungCite this: Inorg. Chem. 1984, 23, 9, 1257–1266Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 A…
Multiple scattering theory is used to obtain a local, one-electron approximation for calculating the valence-band XPS spectra of solids and the generalisation to random substitutional alloys is described. The nature of the final state and the influence of matrix elements on the shape of the spectra are discussed. The…
We describe and classify optical textures observed in thermotropic liquid crystal polymers at elevated temperatures. The evolution from the static state to different textures observed as a consequence of controlled shearing experiments is reported together with the subsequent relaxation behaviour at the cessation of f…
The photoemission derived electron binding energies (with respect to the Fermi level) of xenon atoms adsorbed on nonuniform metal surfaces are found to be sensitive to the local work function of the respective adsorption site. As a consequence separated photoemission lines can be resolved corresponding to xenon atoms…
To characterize the intrinsic adhesion properties of various metal–polyimide systems we have used x-ray photoelectron spectroscopy (XPS) to monitor interfacial reactions during metallization of cured polyimide at room temperature. In situ measurements were made in a UHV system when monolayers and submonolayers of Cr,…
Photoemission and inverse photoemission (or bremsstrahlung spectroscopy) are shown to be complementary techniques for probing occupied and unoccupied electronic states, respectively. The momentum of delocalized valence states can be measured as well as their energy if low electron (photon) energies in the 10–40 eV ran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactive foams for air purificationSusann M. Brander, Gudrun I. Johansson, Bengt G. Kronberg, and Per J. SteniusCite this: Environ. Sci. Technol. 1984, 18, 4, 224–230Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April…
The X-ray diffraction analysis of 75 thin volcanic clay bands in the Lower Cretaceous of the Peace River coalfield shows kaolinite and mixed-layer illite–smectite to be the two clay minerals present. Kaolinite is dominant in the clay bands (tonsteins) in the coal-bearing Gething and Gates formations, whereas illite–sm…
A methodology for predicting the expected combined stochastic radiobiological effects of sequential exposure to different ionizing radiations is used to arrive at a methodology for predicting the radiobiological effects of simultaneous exposure. Both methodologies require developing additive-damage dose-effect models.…
The feasibility of using polarized deuterium (D) and tritium (T) plasmas in fusion reactors may be seriously affected by recycling in material walls. Theoretical and experimental results are reviewed which show how the depolarization rates of absorbed D and T depend on first wall parameters such as the temperature, th…
Abstract A method is described for the quantitative analysis of bulk specimens without standards by using peak‐to‐local background ratios in energy‐dispersive electron probe microanalysis. Theoretical transport investigations have been used to derive an expression for the absolute determination of ( P / B ) ratios. Ac…
Abstract Single crystals of LaOCl have been grown from molten LaCl 3 by a slow cooling technique. The Raman spectra of these crystals have been recorded and the frequencies and symmetries of the different lines determined by means of polarized Raman scattering.
Abstract The tensile stress—strain curves of various types of polyethylene were compared from 77 to 298 K in nitrogen, isopentane, and the inert environment of helium at various strain rates. It was found that in general polyethylene crazes in a gas such as nitrogen at a temperature below 1.6 times its boiling point a…
On decrit le processus de fabrication et on etudie les proprietes physico-mecaniques de panneaux de particules de pin a liant ciment: densite, absorption d'eau, stabilite dimensionnelle, resistances a la flexion et a la compression
Far-infrared (FIR) spectra of linear and cross-linked polymers have been obtained and analyzed. The relationship of the parameters of these spectra to the characteristics of macromolecules is established. The role of molecular interactions in the formation of potential barriers to libration of polar groups and the low…
In contrast to wild-type cells, the Bacillus subtilis mutant SF109 that lacks the active 2-ketoglutarate dehydrogenase enzymatic complex is unable to increase the specific activity of two enzymes subject to glucose catabolite repression, aconitase and histidase, during limitation of growth by glucose. Examination of t…
Current industrial practice for the determination of free acid in hydrometallurgical zinc processing solutions has been reviewed in a critical manner. Most of the methods are unable to overcome entirely the problems presented by high concentrations of various hydrolyzable metal ions. Because zinc processing solutions…
Myelography of the lumbar and lower thoracic spine was performed in 46 patients (23 using metrizamide and 23 using iohexol) as a parallel double blind randomized study. Neurological examinations, laboratory testing, and EEG studies were performed before and after myelography, and side effects were recorded. On compari…