Materials Literature
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Abstract The characteristic energy losses suffered by a 20 keV electron beam through thin films of some transition metals (Sc, Y, Zr, Hf) and of their oxides are measured using a magnetic spectrograph up to 50 eV. The energy loss function — Im 1/ε and the complex dielectric constant are calculated. It is shown that th…
Infrared and Raman spectra in the ferroelectric phase of BaTi${\mathrm{O}}_{3}$ are compared. Inconsistencies about mode coupling are discussed. The mode-coupling formalism has been successfully used by several authors to explain the Raman data but the calculation of an infrared spectrum based on Raman parameters did…
Abstract Rare earth metal (Dy 3+ , Er 3+ , Eu 3+ , and Sm 3+ ) salts of copolymers of methyl methacrylate–methacrylic acid, styrene–acrylic acid, 1‐vinylnaphthalene–acrylic acid and 1‐vinylanthracene–styrene–acrylic acid were prepared. The fluorescence of these polymer salts under ultraviolet excitation was investigat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAxial ligation constants of iron(II) and cobalt(II) "capped" porphyrinsPaul E. Ellis Jr., Jack E. Linard, Thomas Szymanski, Robert D. Jones, John R. Budge, and Fred BasoloCite this: J. Am. Chem. Soc. 1980, 102, 6, 1889–1896Publication Date (Print):March 1, 1980Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTunneling model for hydrogen abstraction reactions in low-temperature solids. Application to reactions in alcohol glasses and acetonitrile crystalsRobert J. Le Roy, Hisao Murai, and Ffrancon WilliamsCite this: J. Am. Chem. Soc. 1980, 102, 7, 2325–2334Publication Date (Print)…
Current‐potential ( i‐E ) curves for the electrochromic process at electrodes were calculated with a digital simulation model which assigns the rate of charge transfer at the oxide/solution interface and the rate of diffusion of hydrogen into the bulk of the film as major variables. The simulated i‐E curves agreed wel…
A semiempirical theoretical method for calculating the resonant Raman excitation profiles (RREP) from the measured absorption profile is developed and applied to measurements on pyrimidine mononucleotides. The method is general and provides a way of checking the consistency of a measured RREP with a measured absorptio…
Abstract Metal‐4,4′,4″,4″′‐tetracarboxyphthalocyanine [Metal = Fe(III), Co(II), Mt‐taPc] were synthesized by the hydrolysis of metal‐4,4′,4″,4″′‐tetracarboxamidephthalocyanine (Mt‐tamPc). These metal‐taPc are soluble in water and in aprotic polar solvents such as N,N ′‐dimethylformamide. Poly(styrene) bonded Mt‐taPc w…
Membranous sialyltransferase complexes from Escherichia coli K-235 catalyze the synthesis of surface polymers containing alpha-2,8-ketosidically linked polysialic acid. Undecaprenyl phosphate functions as an intermediate carrier of sialic acid (NeuNAc) residues between cytidine 5'-monophospho-N-acetylneuraminic acid (…
Abstract Blends of polypropylene (PP) and low density polyethylene (LDPE) were prepared by both batch mixing followed by compression molding and extruder compounding followed by injection molding. Compression molded PP‐LDPE blends were found to have very poor toughness, whereas extruded blends, injection molded withou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe x-ray photoelectron spectra of inorganic molecules. 25. X-ray photoelectron spectra of copper(I) and copper(II) complexes derived from macrocyclic ligandsR. R. Gagne, J. L. Allison, C. A. Koval, W. S. Mialki, T. J. Smith, and R. A. WaltonCite this: J. Am. Chem. Soc. 1980…
Abstract By means of the inclusion of a dispersed phase with low Young's modulus, the generally low thermal stress resistance of brittle materials for high‐temperature structures can be improved significantly. An analysis of this improvement on the basis of continuum and micromechanical theory is presented in this pap…
The anomalously low mobility of collagen peptides on SDS-gel electrophoresis was investigated, using tadpole skin collagen and bovine Type I, II, and III collagens. The free electrophoretic mobility of alpha 1 chains of collagen was found to be smaller than those of alpha 2 chain and common proteins of similar size, w…
Abstract Soil formation as affected by topography and time was studied in highly calcareous parent materials under the semiarid conditions of southern Iran. Soils of the 95,000‐ha Sarvestan basin were considered for this purpose. Topographic features of the Sarvestan basin were related to variations in soil texture an…
Abstract Die Carbonate der Alkalimetalle und einer Reihe von Übergangsmetallen lassen sich darstellen durch Einwirkung von CO 2 unter Drucken zwischen 600 und 4500 at bei Temperaturen zwischen 100 und 400°C auf entsprechende Salzlösungen, Hydroxide oder Oxide. Die auf diese Weise dargestellten Verbindungen MnCO 3 , Fe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared and Raman spectra of ammonium, potassium, rubidium, and cesium metavanadatesShinji Onodera and Yusaku IkegamiCite this: Inorg. Chem. 1980, 19, 3, 615–618Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Published inissue 1 March 198…
The problems relating to the classification of mudrocks, and in particular the role of grain size, are discussed. Classification based on silt-clay proportions is more realistic than a silt-clay-sand system. The grain size, as measured in mudrocks, is an uncertain quantity and the use of the quartz content is advocate…
Sintering kinetics of the system Si 3 N4‐Y2O 3 ‐Al 2 O3 were determined from measurements of the linear shrinkage of pressed disks sintered isothermally at 1500° to 1700°C. Amorphous and crystalline Si 3 N 4 were studied with additions of 4 to 17 wt% Y 2 O 3 and 4 wt% A1 2 O 3 . Sintering occurs by a liquid‐phase mech…
The hydrolytic degradation of polyester urethane elastomers is due to the acid catalyzed hydrolysis of the ester group. Acid content (A) and the reciprocal of the number average molecular weight increase by equivalent amounts indicating that each molecular chain scission produces one acid group. The fractional rate of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-spin iron(II) in the porphyrin plane. Structural characterization of (meso-tetraphenylporphinato)bis(tetrahydrofuran)iron(II)Christopher A. Reed, Toshio Mashiko, W. Robert Scheidt, K. Spartalian, and George LangCite this: J. Am. Chem. Soc. 1980, 102, 7, 2302–2306Publica…