Materials Literature
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Abstract Oxygen consumption and yield of oxidation products during γ‐irradiation were studied on five types of polyethylene (PE), ethylene–butene copolymer (EB), and ethylene–propylene copolymer (EPR) using gas chromatography, mass spectrography, and high‐resolution NMR. Samples were irradiated in oxygen under pressur…
Abstract A new kinetic model for cure reactios has been developed from the concept of nonequilibrium thermodynamic fluctuation theory in which a distribution function relaxation spectrum is used for explaining cure kinetics of polymer–filler systems. It is found that an increase in filler loading reduces the relaxatio…
Results of X-ray diffraction experiments on lithium nitride (Li3N) in the temperature range between 294 and 888 K show strong anharmonic effects. The deviations from harmonicity cannot be interpreted by interstitial sites or split positions. The application of an anharmonic temperature factor which is based on the Gra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew trinuclear, oxo-centered, basic carboxylate compounds of transition metals. 3. Syntheses and x-ray studies of the trivanadium(III,III,III) and trivanadium(II,III,III) compounds [V3(.mu.3-O)(CH3CO2)6(CH3COOH)2(THF)]+[VCl4(CH3COOH)2]- and V3(.mu.3-O)(CF3CO2)6(THF)3 with "c…
The authors present the results of high resolution measurements of bremsstrahlung excited Auger electron spectra in the 5d series. The spectra provide an experimental test of atomic models. The measured effective Coulomb interaction between the final state holes displays a jump in value between Pt and Au, analogous to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable-temperature Raman and infrared spectra of the copper acetate dimer Cu2(O2CCH3)4(H2O)2 and its derivativesY. Mathey, D. R. Greig, and D. F. ShriverCite this: Inorg. Chem. 1982, 21, 9, 3409–3413Publication Date (Print):September 1, 1982Publication History Published on…
Abstract During weathering of forsterite and tephroite under the humid, tropical conditions of the Ivory Coast, intermediate Mg,Fe 3+ − or Mn 2+ -smectites appear prior to widespread development of iron or manganese oxyhydroxides. In forsterite, the smectite varies from an Mg-trioctahedral variety near the centres of…
This paper describes an algorithm for representing the transformer hysteresis. This algorithm is useful under transient conditions and has the capability of representing minor loops. It allows the multi-valued hysteresis behavior to be represented as a linear element at each instant of time. This algorithm has been im…
David W L Hukins 1981 Oxford: Pergamon ix + 164 pp price £11.95 Most books on x-ray diffraction relate to crystalline materials (where the solving of structures has become a rather mechanical process) and, because of the breadth of the subject, are either very superficial or indulge in considerable mathematical detail…
Abstract The preparation of a series of macrocycles, formed by reaction of HO‐(‐CH 2 ‐CH 2 ‐O‐) n H with 1,10‐phenanthroline‐2,9‐dicarbonyl chloride (n = 2,3,4) and 1,8‐naphthyridine‐2,7‐dicarbonyl chloride (n = 3,4), is described. An improved synthetic route to 2,7‐dimethyl‐1,8‐naphthyridine 9 is also reported.
A general description based on the sensitivity function is presented for the effects of detection coil geometry and sample geometry on the output of a vibrating sample magnetometer (VSM). This function gives the VSM output versus position of a vibrating dipole. Calculations of the sensitivity function for axial and tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of metal dilution on the spin-crossover behavior in [FexM1-x(phen)2(NCS)2] (M = Mn, Co, Ni, Zn)P. Ganguli, P. Guetlich, and E. W. MuellerCite this: Inorg. Chem. 1982, 21, 9, 3429–3433Publication Date (Print):September 1, 1982Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe propanoate ester of (2-hydroxypropyl)cellulose: a thermotropic cholesteric polymer that reflects visible light at ambient temperaturesSo Lan Tseng, Gunar V. Laivins, and Derek G. GrayCite this: Macromolecules 1982, 15, 5, 1262–1264Publication Date (Print):September 1, 19…
Abstract Parametric sensitivity of tubular reactors is analyzed to provide critical values of the heat of reaction and heat transfer parameters defining runaway and stable operations for all positive‐order exothermic reactions with finite activation energies, and for all reactor inlet temperatures. Evaluation of the c…
This paper presents a study of the effects of carbon, nitrogen, molybdenum, and manganese on the sensitization of high-purity austenitic stainless steels of composition similar to Type 304. The modified Strauss test (ASTM-A262-E), the oxalic acid etch test (ASTM-A262A) and analytical electron microscopy were used to d…
Czochralski (CZ) silicon crystals with striation free and microscopic homogeneous dopant concentrations are grown under the presence of an axially symmetric vertical magnetic field. The thermal convections of 3.5 kg of molten silicon in a crucible are successfully suppressed by a magnetic field of more than 1000 Oe in…
Abstract Polyethylene melts normally cannot be crystallized in an isothermally controlled manner below ca. 110°C as crystallization is too fast owing to the presence of preexisting nuclei. We here present a new simple method for producing droplets enabling crystallization to be conducted isothermally down to 75°C and…
Photon correlation spectroscopy experiments on silica particles dispersed in cyclohexane over a large concentration range and near the optical matching point have been explained by the occurrence of two different relaxation modes: one mode due to the collective diffusion of the particles and the other mode due to the…
A quasi one-dimensional Hubbard model embodying features of (TMTSF) 2 PF 6 etc. was studied. The SDW gap equation derived by a variational method is solved. The gap parameter is derived at OK and at finite temperatures as a function of the transverse electron transfer energy t '. The SDW transition proves to be of the…
The qualitative and quantitative results deduced by a recent theory [J. Phys. Soc. Jpn. 51 (1982) 515] were found to agree fairly well with the experimental results on NaNO 2 . However, of the theoretical ε vs T graph, the part just above the incommensurate-to-ferroelectric transition point was found to disagree with…